CN117256989A - Wig - Google Patents

Abstract

The invention provides a wig, which includes an inner layer structure and an outer layer structure. The inner layer structure at least contains an inner layer base material of P3HB4HB, and the outer layer structure at least contains an outer layer base material of P3HB4HB. They are prepared by melt spinning. Wigs with core or island structure. This wig fully imitates human hair, is flexible on the outside and tough on the inside, is stronger than human hair, has excellent dyeability, and can completely replace chemical fiber wigs.

Description

A wig

Technical Field

The invention relates to the technical field of fiber materials, and in particular to a wig and a preparation method and application thereof.

Background Art

At present, high-end wigs are mostly made of human hair, animal hair or protein fibers. They are soft to the touch, moderately glossy and breathable, but they are expensive and face the problem of raw material shortage. Wigs made of synthetic fibers such as polyester (PET), polyvinyl chloride (PVC), polyamide (PA), polypropylene (PP), etc., although cheaper, have poorer feel, gloss and performance, and cannot be compared with human hair. In addition, chemical fiber wigs cannot be naturally degraded after being abandoned. In the long run, they will inevitably cause a large amount of accumulation, which is extremely difficult to handle, posing a hidden danger to the ecological environment and not in line with the concept of sustainable development.

Based on the above situation, it is urgent to discover a suitable degradable material as the main base material for the preparation of wigs to replace low-grade pure fiber wigs, while having physical and chemical properties and usage experience comparable to human hair, and having good breathability, antibacterial, antistatic, heat resistance and other properties, so as to solve the outstanding problems existing in the existing wig industry.

Summary of the invention

The present invention provides a wig with a skin-core or island-type structure composed of specific raw materials. The wig fully imitates human hair, is soft on the outside and tough on the inside, has greater strength than human hair, and has excellent dyeability, and can completely replace chemical fiber wigs. Without the addition of antibacterial agents and smoothing agents, the wig has good antibacterial and anti-mite properties and moisturizing properties, feels smooth, and has excellent skin-friendliness. The preparation method of the wig not only eliminates the steps of acid washing, bleaching and dyeing, but also can be dyed and faded again during subsequent use, making the user experience of the wig closer to real hair. In addition, the wig has a more uniform shaping method, a lower shaping temperature, a shorter shaping time, a long normal service life, and a fast degradation rate after abandonment, which is more in line with the concept of low carbon and environmental protection. Specifically:

A first aspect of the present invention provides a wig, wherein the wig comprises an outer layer structure and an inner layer structure.

The mass ratio of the outer layer structure (or its raw material) to the inner layer structure (or its raw material) is any value in the range of (35-126):(10-89), preferably any value in the range of (62.5-81):(35-50), and more preferably 8:5 or 1.6:1.

Preferably, the outer layer structure (or its raw material) comprises an outer layer substrate and an outer layer auxiliary material. Wherein, the mass content of the outer layer substrate in the outer layer structure (or its raw material) is any value in the range of 50%-100% (preferably 50%-62.5% or 62.5%-100% or 60-70%), such as 50%, 60%, 62.5%, 65%, 70%, 80%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.9% or 100%. The mass content of the outer layer auxiliary material in the outer layer structure (or its raw material) is any value in the range of 0%-50%, such as 0%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 30%, 40% or 50%.

In a specific embodiment of the present invention, the outer layer structure (or its raw materials) comprises 35-90 parts (preferably 55-70 parts) of outer layer base material and 0-36 parts (preferably 12-24) of outer layer auxiliary material.

In a specific embodiment of the present invention, the outer layer structure (or its raw materials) includes 62.5 parts of outer layer base material and 17.625 parts of outer layer auxiliary material.

Preferably, the outer layer substrate comprises P3HB4HB. The molar content of 4HB in the P3HB4HB is any value in the range of 0-20%, preferably any value in the range of 5-20%, 8-15%, 10-20%, or 8-10%, such as 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%.

Preferably, the outer layer substrate comprises P3HB4HB with the same 4HB molar content.

Preferably, the outer layer substrate comprises one or a combination of two or more of P3HB4HB with different 4HB molar contents.

The inner layer structure (or its raw material) includes an inner layer substrate and an inner layer auxiliary material. The mass content of the inner layer substrate in the inner layer structure (or its raw material) is any value between 25% and 100%, such as 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.9% or 100%. The mass content of the inner layer auxiliary material in the inner layer structure (or its raw material) is any value between 0% and 75%, such as 0%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 30%, 40%, 50%, 60%, 70% or 75%.

In a specific embodiment of the present invention, the inner layer structure (or its raw materials) comprises 10-60 parts (preferably 30-40 parts) of inner layer base material and 0-29 parts (preferably 10-19 parts) of inner layer auxiliary material.

In a specific embodiment of the present invention, the inner layer structure (or its raw materials) includes 35 parts of inner layer base material and 14.125 parts of inner layer auxiliary material.

The inner layer substrate comprises P3HB4HB. The molar content of 4HB in the P3HB4HB is any value in the range of 0-20%, preferably any value in the range of 5-20%, 8-15%, 10-20%, or 8-10%, such as 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%.

Preferably, the inner layer substrate comprises P3HB4HB with the same 4HB molar content.

Preferably, the inner layer substrate comprises one or a combination of two or more of P3HB4HB with different 4HB molar contents.

Preferably, the inner layer substrate further comprises one or a combination of two or more of PBAT, PBS, PBA, PBT, PLA, PPC, regenerated cellulose, seaweed fiber or soy protein fiber.

In a specific embodiment of the present invention, the inner substrate is selected from any one of the following groups:

A) P3HB4HB, PLA and PBAT, wherein the mass ratio of P3HB4HB, PLA and PBAT is (10-20): (10-15): (5-10), preferably 16:12:7, and more preferably 16 parts of P3HB4HB, 12 parts of PLA, and 7 parts of PBAT;

B) P3HB4HB, PPC and soy protein fiber, wherein the mass ratio of P3HB4HB, PPC and soy protein fiber is (10-15): (10-20): (5-10), preferably 13:16:6, more preferably 13 parts of P3HB4HB, 16 parts of PPC and 6 parts of soy protein fiber;

C) P3HB4HB, seaweed fiber and PBS, wherein the mass ratio of P3HB4HB, seaweed fiber and PBS is (10-20): (10-15): (5-10), preferably 15:12:8, and more preferably 15 parts of P3HB4HB, 12 parts of seaweed fiber and 8 parts of PBS;

D) P3HB4HB, PBA and PBT, wherein the mass ratio of P3HB4HB, PBA and PBT is (10-20): (5-15): (5-15), preferably 15:10:10, and more preferably 15 parts of P3HB4HB, 10 parts of PBA and 10 parts of PBT;

E) P3HB4HB, PLA and regenerated cellulose, wherein the mass ratio of P3HB4HB, PLA and regenerated cellulose is (5-15): (10-20): (5-15), preferably 10.5:15:9.5, and more preferably 10.5 parts of P3HB4HB, 15 parts of PLA, and 9.5 parts of regenerated cellulose.

Preferably, the outer layer auxiliary material or the inner layer auxiliary material independently includes one or a combination of two or more of a heat stabilizer, a chain extender, an antioxidant, a nucleating agent, a coupling agent, an anti-hydrolysis agent, a flame retardant, a surfactant or a masterbatch.

Wherein, the heat stabilizer is selected from one or more of calcium stearate, zinc stearate, magnesium stearate, barium stearate, methyl thioglycolate, and heat stabilizer DP1100;

The chain extender is selected from one or more of chain extender X-U993, chain extender LK4468, chain extender ADR4400, and chain extender 6901;

The antioxidant is selected from one or more of antioxidant 1010, antioxidant 1024, antioxidant 1076, and antioxidant T501;

The nucleating agent is selected from one or more of tungsten disulfide, titanium boride, boron nitride, nano titanium dioxide, nano silicon dioxide HB-630, hollow glass microspheres, and carbon nanotubes;

The coupling agent is selected from one or more of titanate coupling agent AT1618, maleic anhydride, coupling agent BYKC8003, silane coupling agent A-172, silane coupling agent KH550, and silane coupling agent KH570;

Preferred are titanate coupling agent AT1618, maleic anhydride and silane coupling agent KH570.

In a specific embodiment of the present invention, it is 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.25 parts of silane coupling agent KH570; or, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.25 parts of silane coupling agent KH570.

For example, in the outer layer structure, 62.5 parts of P3HB4HB (4HB molar content 8%), 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.25 parts of silane coupling agent KH570 are contained.

For another example, in the inner layer structure, there are 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.25 parts of silane coupling agent KH570.

Preferred are titanate coupling agent AT1618, maleic anhydride and silane coupling agent KH550.

In a specific embodiment of the present invention, it is 0.375 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.375 parts of silane coupling agent KH550; or, it is 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.25 parts of silane coupling agent KH550.

For example, in the outer layer structure, 50 parts of P3HB4HB (4HB molar content 5%), 12.5 parts of P3HB4HB (4HB molar content 20%), 0.375 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.375 parts of silane coupling agent KH550.

For another example, in the inner layer structure, there are 13 parts of P3HB4HB (4HB molar content 15%), 16 parts of PPC, 6 parts of soybean protein fiber, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, and 0.25 parts of silane coupling agent KH550.

Preferred are coupling agent BYKC8003, maleic anhydride and silane coupling agent A-172.

In a specific embodiment of the present invention, it is 0.25 parts of coupling agent BYKC8003, 0.375 parts of maleic anhydride, and 0.375 parts of silane coupling agent A-172, or 0.2 parts of coupling agent BYKC8003, 0.275 parts of maleic anhydride, and 0.275 parts of silane coupling agent A-172.

For example, in the outer layer structure, 5 parts of P3HB4HB (4HB molar content 5%), 57.5 parts of P3HB4HB (4HB molar content 10%), 0.25 parts of coupling agent BYKC8003, 0.375 parts of maleic anhydride, and 0.375 parts of silane coupling agent A-172.

For another example, in the inner layer structure, there are 15 parts of P3HB4HB (4HB molar content 15%), 12 parts of seaweed fiber, 8 parts of PBS, 0.2 parts of coupling agent BYKC8003, 0.275 parts of maleic anhydride, and 0.275 parts of silane coupling agent A-172.

The anti-hydrolysis agent is selected from one or more of anti-hydrolysis agent 936, anti-hydrolysis agent HD900A, and anti-hydrolysis agent BTWR-500;

The flame retardant is selected from one or more of ammonium polyphosphate, triphenyl phosphate, and toluene diphenyl phosphate.

Preferably, it is selected from ammonium polyphosphate and/or triphenyl phosphate, and more preferably, the mass ratio of ammonium polyphosphate to triphenyl phosphate is 3:5 to 2:3.

For example, in the outer layer structure, 62.5 parts of P3HB4HB (4HB molar content 8%), 2 parts of ammonium polyphosphate, and 3 parts of triphenyl phosphate.

For another example, in the inner layer structure, there are 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 1.5 parts of ammonium polyphosphate, and 2.5 parts of triphenyl phosphate.

It is preferably selected from triphenyl phosphate and/or toluene diphenyl phosphate, and further preferably the mass ratio of triphenyl phosphate to toluene diphenyl phosphate is 11:5 to 7:3.

For example, in the outer layer structure, 50 parts of P3HB4HB (4HB molar content 5%), 12.5 parts of P3HB4HB (4HB molar content 20%), 3.5 parts of triphenyl phosphate, and 1.5 parts of toluene diphenyl phosphate.

For another example, in the inner layer structure, there are 13 parts of P3HB4HB (4HB molar content 15%), 16 parts of PPC, 6 parts of soybean protein fiber, 2.75 parts of triphenyl phosphate, and 1.25 parts of toluene diphenyl phosphate.

Preferred are ammonium polyphosphate and/or toluene diphenyl phosphate.

For example, in the outer layer structure, 5 parts of P3HB4HB (4HB molar content 5%), 57.5 parts of P3HB4HB (4HB molar content 10%), 2.5 parts of ammonium polyphosphate, and 2.5 parts of toluene diphenyl phosphate.

For example, in the inner layer structure, there are 15 parts of P3HB4HB (4HB molar content 15%), 12 parts of seaweed fiber, 8 parts of PBS, 2 parts of ammonium polyphosphate, and 2 parts of toluene diphenyl phosphate.

The surfactant is selected from one or more of polyethylene glycol, polyvinyl alcohol, rhamnolipid, and quaternary ammonium salt surfactants; further, polyethylene glycol is one or more of polyethylene glycol-3000, polyethylene glycol-6000, polyethylene glycol-10000, and polyethylene glycol-20000; polyvinyl alcohol is one or more of polyvinyl alcohol 1799, polyvinyl alcohol 2099, polyvinyl alcohol 2499, and polyvinyl alcohol 2699; and the quaternary ammonium salt surfactant is one or more of benzyltriethylammonium chloride, didodecyldimethylammonium chloride, hexadecyltrimethylammonium chloride, and octadecyltrimethylammonium chloride.

Preferred are polyethylene glycol-6000 and/or rhamnolipid.

For example, in the outer layer structure, 62.5 parts of P3HB4HB (8% by molar content of 4HB), 0.375 parts of polyethylene glycol-6000, and 0.375 parts of rhamnolipid. Or in the outer layer structure, 62.5 parts of P3HB4HB (8% by molar content of 4HB) and 0.375 parts of rhamnolipid.

For example, in the inner layer structure, 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.25 parts of polyethylene glycol-6000, and 0.25 parts of rhamnolipid. Or in the inner layer structure, 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, and 0.25 parts of rhamnolipid.

Preferred is polyvinyl alcohol-2099 and/or rhamnolipid.

For example, in the outer layer structure, 50 parts of P3HB4HB (4HB molar content 5%), 12.5 parts of P3HB4HB (4HB molar content 20%), 0.3 parts of polyvinyl alcohol-2099, and 0.45 parts of rhamnolipid.

For another example, in the inner layer structure, there are 13 parts of P3HB4HB (4HB molar content 15%), 16 parts of PPC, 6 parts of soybean protein fiber, 0.2 parts of polyvinyl alcohol-2099, and 0.3 parts of rhamnolipid.

Preferred are rhamnolipids and/or benzyltriethylammonium chloride.

For example, in the outer layer structure, 5 parts of P3HB4HB (4HB molar content 5%), 57.5 parts of P3HB4HB (4HB molar content 10%), 0.45 parts of rhamnolipid, and 0.3 parts of benzyltriethylammonium chloride.

For another example, in the inner layer structure, there are 15 parts of P3HB4HB (4HB molar content 15%), 12 parts of alginate fiber, 8 parts of PBS, 0.3 parts of rhamnolipid, and 0.2 parts of benzyltriethylammonium chloride.

The masterbatch is a P3HB4HB base masterbatch with different color systems added as needed.

In a specific embodiment of the present invention, the outer layer structure (or its raw material) includes 62.5 parts of a copolymer of 3-hydroxybutyric acid (3HB) and 4-hydroxybutyric acid (4HB) P3HB4HB (4HB molar content 8%), and the inner layer structure (or its raw material) includes 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, and 7 parts of PBAT. Preferably, the inner layer structure and/or the outer layer structure further include a coupling agent, a surfactant and/or a flame retardant.

In a specific embodiment of the present invention, the outer layer structure (or its raw material) includes 50 parts of P3HB4HB (4HB molar content 5%), 12.5 parts of P3HB4HB (4HB molar content 20%), and the inner layer structure (or its raw material) includes 13 parts of P3HB4HB (4HB molar content 15%), 16 parts of PPC, and 6 parts of soy protein fiber. Preferably, the inner layer structure and/or the outer layer structure further include a coupling agent, a surfactant and/or a flame retardant.

In a specific embodiment of the present invention, the outer layer structure (or its raw materials) includes 5 parts of P3HB4HB (4HB molar content 5%), 57.5 parts of P3HB4HB (4HB molar content 10%), and the inner layer structure (or its raw materials) includes 15 parts of P3HB4HB (4HB molar content 15%), 12 parts of seaweed fiber, and 8 parts of PBS. Preferably, the inner layer structure and/or the outer layer structure further include a coupling agent, a surfactant and/or a flame retardant.

In a specific embodiment of the present invention, the outer layer structure (or its raw material) includes 62.5 parts of P3HB4HB (4HB molar content 8%), and the inner layer structure (or its raw material) includes 15 parts of P3HB4HB (4HB molar content 10%), 10 parts of PBA, and 10 parts of PBT. Preferably, the inner layer structure and/or the outer layer structure further include a coupling agent, a surfactant and/or a flame retardant.

In a specific embodiment of the present invention, the outer layer structure (or its raw material) includes 62.5 parts of P3HB4HB (4HB molar content 8%), and the inner layer structure (or its raw material) includes 10.5 parts of P3HB4HB (4HB molar content 20%), 15 parts of PLA, and 9.5 parts of regenerated cellulose. Preferably, the inner layer structure and/or the outer layer structure further include a coupling agent, a surfactant and/or a flame retardant.

In a specific embodiment of the present invention, the outer layer structure (or its raw material) includes 62.5 parts of a copolymer of 3-hydroxybutyric acid (3HB) and 4-hydroxybutyric acid (4HB) P3HB4HB (4HB molar content 8%), 1 part of a coupling agent, 0.375 parts or 0.75 parts of a surfactant and 5 parts of a flame retardant, and the inner layer structure (or its raw material) includes 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.75 parts of a coupling agent, 0.25 parts or 0.5 parts of a surfactant and 4 parts of a flame retardant.

In a specific embodiment of the present invention, the outer layer structure (or its raw material) includes 62.5 parts of a copolymer of 3-hydroxybutyric acid (3HB) and 4-hydroxybutyric acid (4HB) P3HB4HB (4HB molar content 8%) and 0.5 parts of a titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of a silane coupling agent KH570, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, and the inner layer structure (or its raw material) includes 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.25 parts of a titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of a silane coupling agent KH570, 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate, 0.25 parts of polyethylene glycol-6000, and 0.25 parts of rhamnolipid.

In a specific embodiment of the present invention, it includes 35-90 parts of outer layer substrate, 0-2.25 parts of chain extender, 0-1.5 parts of antioxidant, 0-4 parts of nucleating agent, 0-2.5 parts of heat stabilizer, 0-2 parts of coupling agent, 0-1.5 parts of anti-hydrolysis agent, 0-1.5 parts of surfactant, 0-10 parts of flame retardant, 0-10 parts of masterbatch, and 10-60 parts of inner layer substrate, 0-1.75 parts of chain extender, 0-1.5 parts of antioxidant, 0-4 parts of nucleating agent, 0-1.5 parts of heat stabilizer, 0-1.5 parts of coupling agent, 0-1 part of anti-hydrolysis agent, 0-1 part of surfactant, 0-8 parts of flame retardant, and 0-8 parts of masterbatch.

Preferably, the structure of the wig is a skin-core type or an island-in-the-sea type.

Among them, the outer layer structure is the cortex or sea component, and the inner layer structure is the core layer or island component.

The second aspect of the present invention provides a method for preparing the above-mentioned wig, which comprises melt-granulating the outer layer structure and the inner layer structure respectively, and then spinning, cooling, oiling, stretching and winding.

Preferably, after the stretching and winding, the process further includes inspection, grading, and packaging to obtain the composite PHA wig yarn;

Preferably, the preparation method further comprises a hair product manufacturing process, that is, the composite PHA wig yarn is subjected to beating, three-way spinning, post-processing, shaping, moisture regain, and packaging to obtain a wig with PHA as the base material.

Preferably, the barrel temperature of the outer layer structure melt granulation is any value in the range of 130-210°C, and more preferably any value in the range of 150-190°C or 155-185°C; for example, the barrel temperature is 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210°C.

Preferably, the air supply temperature for melt granulation of the outer layer structure is any value in the range of 18-65°C, more preferably any value in the range of 45-65°C or 50-60°C; for example, the air supply temperature is 18, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65°C.

Preferably, the barrel temperature of the inner layer structure melt granulation is any value in the range of 130-210°C, and more preferably any value in the range of 150-205°C or 155-200°C; for example, the barrel temperature is 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210°C.

Preferably, the air supply temperature for the inner layer structure melt granulation is any value in the range of 18-65°C, more preferably any value in the range of 25-60°C or 30-55°C; for example, the air supply temperature is 18, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65°C.

Preferably, the spinning temperature is any value in the range of 120-210°C, more preferably any value in the range of 120-180°C or 125-175°C; for example, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210°C.

Preferably, the pressure in the melt metering pump during the spinning process is controlled to be any value in the range of 8-17 MPa, and more preferably any value in the range of 10-15 MPa; for example, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 MPa.

Preferably, the spinning speed is any value in the range of 80-160 m/min, for example, 80, 90, 100, 110, 120, 130, 140, 150, 160 m/min.

Preferably, the temperature of the stretching and winding is set to any value in the range of 70-120°C, further preferably any value in the range of 80-120 or 85-120°C, for example, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120°C.

Preferably, the stretching and winding speed of the stretching and winding is any value in the range of 200-640 m/min, for example, 200, 300, 400, 500, 600, 640 m/min.

Preferably, the stretching ratio of the stretching and winding is any value between 2.5 and 4, for example, 2.5, 3, 3.5, or 4.

Preferably, the preparation method further comprises shaping.

Preferably, the hair styling is curly hair styling or straight hair styling. Among them, the curly hair styling method preferably adopts steam cabinet styling, and the straight hair styling method preferably adopts steam cabinet styling.

Further preferably, the temperature for setting the curly hair is any value of 60-118°C, preferably any value of 65-110°C or 70-105°C, for example 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 118°C.

Further preferably, the curly hair styling time is any value of 15-70 min, preferably any value of 25-60 min, for example 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70 min.

Further preferably, the temperature of the straight hair styling is any value of 70-125°C, preferably any value of 75-118°C or 80-118°C, for example 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 118, 120, 125°C.

Further preferably, the styling time of the straight hair is any value in the range of 20-75 min, preferably any value in the range of 30-65 min, for example 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 min.

In a specific embodiment of the present invention, the preparation method comprises the following steps:

Step 1: weigh 35-90 (preferably 55-70) parts of the outer layer base material and 0-36 (preferably 12-24) parts of the outer layer auxiliary material by weight, mix them, melt them through a twin-screw extruder, and cool them to form granules, wherein the barrel temperature is set to 130-210°C, annular blowing is used, and the air supply temperature is 18-65°C to obtain outer layer granules;

Step 2: weigh 10-60 (preferably 30-40) parts of the inner layer base material and 0-29 (preferably 10-19) parts of the inner layer auxiliary material by weight, mix them, melt them through a twin-screw extruder, and cool them to form granules, wherein the barrel temperature is set to 130-210°C, annular blowing is used, and the air supply temperature is 18-65°C to obtain inner layer granules;

Step 3: vacuum drying the obtained outer layer pellets and inner layer pellets, respectively injecting them into an extrusion device with a heating device for melting, and extruding them through a screw melt, and cooperating with a composite spinneret assembly with a skin-core or sea-island structure, so that the outer layer pellets correspond to the skin layer or sea component, and the inner layer pellets correspond to the core layer/island component, to form a complete composite PHA pre-oriented yarn, wherein the spinning temperature is set to 120-210°C, the pressure in the melt metering pump is controlled to 8-17MPa, and the spinning speed is 80-160m/min;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel, wherein the air supply temperature is 18-65°C;

Step 5: Apply oil to the composite PHA pre-oriented yarn after cooling in step 4 through an oil roller;

Step 6: Send the oiled composite PHA pre-oriented yarn in step 5 to a hot roller and a winding device for stretching and winding, control the stretching temperature to be 70-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and wind the obtained finished yarn on a bobbin;

Preferably, the method further comprises step seven: inspecting, grading and packaging the full rolls obtained in step six to obtain composite PHA wig yarns.

Preferably, the method further includes step eight: beating, three-way kneading, post-processing, shaping, moisture regaining and packaging the composite PHA wig yarn to obtain a wig with PHA as the base material.

Preferably, in step eight, the hair shaping is curly hair shaping or straight hair shaping; wherein,

The curly hair is set in a steam cabinet, with a temperature of 60-118°C and a setting time of 15-70 minutes;

The straight hair is styling in a steam cabinet, with a temperature of 70-125℃ and a styling time of 20-75min.

In a specific embodiment of the present invention, the preparation method comprises:

Step 1: vacuum dry the raw materials at 70-100°C for 6-12 hours to control the moisture content below 0.5%;

Step 2: weigh 35-90 (preferably 62.5) parts of outer layer substrate, 0-2.25 parts of chain extender, 0-1.5 parts of antioxidant, 0-4 parts of nucleating agent, 0-2.5 parts of heat stabilizer, 0-2 parts of coupling agent, 0-1.5 parts of anti-hydrolysis agent, 0-1.5 parts of surfactant, 0-10 parts of flame retardant, 0-10 parts of masterbatch, and mix them physically, melt and cool them through a twin-screw extruder, set the barrel temperature to 130-210°C, use ring blowing, and the air supply temperature is 18-65°C to obtain outer layer pellets;

Weigh 10 to 60 (preferably 35) parts of an inner layer substrate, 0-1.75 parts of a chain extender, 0-1.5 parts of an antioxidant, 0-4 parts of a nucleating agent, 0-1.5 parts of a heat stabilizer, 0-1.5 parts of a coupling agent, 0-1 parts of an anti-hydrolysis agent, 0-1 parts of a surfactant, 0-8 parts of a flame retardant, and 0-8 parts of a masterbatch for physical mixing, melt and cool to granulate through a twin-screw extruder, set the barrel temperature to 130-210° C., use an annular blower, and use an air supply temperature of 18-65° C. to obtain an inner layer pellet;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100° C. for 1-4 hours, they are respectively injected into an extrusion device with a heating device to melt, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure is respectively sprayed out to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn, wherein the spinning temperature is set to 120-210° C., the pressure in the melt metering pump is controlled to 8-17 MPa, and the spinning speed is 80-160 m/min to obtain the composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 18-65°C;

Step 5, the composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: Feed the composite PHA pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, control the stretching temperature to be 70-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and wind the obtained finished yarn on a bobbin;

Step 7, inspecting, grading, and packaging the full roll obtained in step 6 to obtain the composite PHA wig;

Step 8: The composite PHA wig yarn is subjected to beating, three-way knitting, post-processing, shaping, moisture recovery and packaging to obtain a wig with PHA as the base material.

The third aspect of the present invention provides a use of the above-mentioned wig in the preparation of hair products. Examples of hair products include any artificial hair products such as wigs, hair pieces, false eyelashes, false beards or hair for doll making.

The abbreviations and full names of the present invention are shown in Table 1.

Table 1: Abbreviations and full names

Beneficial effects:

1. The wig of the present invention has a skin-core or island-in-the-sea structure. Human hair is composed of an epidermal scale layer, a main cortical layer and a central medulla layer. When making a wig, it needs to be scaled by acid washing or other treatments, so it mainly has two layers. The skin-core or island-in-the-sea structure wig of the present application fully imitates human hair, is close to human hair at the microscopic level, and has the characteristics of various materials in the cortex/sea component and the core/island component. The wig as a whole is soft on the outside and tough on the inside, and its strength is greater than that of human hair. The hollow glass microbeads added to the core/island component further reduce the fiber weight, making the final wig product lighter, thinner and more comfortable.

2. When preparing the wig, it can be pre-dyed by adding masterbatch, and the dyeing is uniform and transparent, similar to human hair, saving the acid washing, bleaching and dyeing steps in the traditional hair product process, saving manpower and material resources, and reducing the pollution caused by bleaching and dyeing the wig. In addition, the wig has excellent dyeability and can be dyed and faded again during subsequent use. Under the same conditions, the degree of color change is uniform, which has a significant positive effect on the recycling of wigs and improving the user experience of wigs.

3. The main components of the wig of the present invention are all degradable, and since PHA accounts for the largest proportion, even if there are other degradable materials, the degradation environment requirements are significantly reduced, while the degradation speed is greatly increased. The wig is non-toxic from the selection of raw materials to the preparation, and is green, environmentally friendly and sustainable.

4. PHA is used as the main raw material, which abandons the use of chemical fiber materials and avoids the shortage of raw materials faced by human hair, animal hair, etc. At the same time, it is more economical and has a good user experience, and can completely replace chemical fiber wigs.

5. The wig described in the present application has skin-friendly properties and excellent biocompatibility. Therefore, when the user wears the wig, there will be no adverse experiences such as itching, stinging, burning, allergies, dryness, static electricity, and airtightness. Compared with traditional chemical fiber wigs, the comfort of use is greatly improved, and the use experience is closer to human hair.

6. The wig of the present invention, through the PHA modern spinning process, provides the possibility for realizing continuous and automatic wig production, thereby greatly improving production efficiency; and the shaping method is more uniform, not different for straight hair and curly hair; the shaping treatment temperature is much lower than that of human hair, and the shaping time is also greatly shortened, thereby saving energy and reducing emissions, reducing costs, and can partially replace human hair wig making, and innovate the wig industry.

7. The wig of the present invention degrades very slowly during normal use, which is similar to the loss of real hair, so it has a long service life, close to that of human hair. It will only degrade rapidly when it is abandoned and placed in natural environments such as soil, rivers, lakes, and oceans. In addition, the wig based on PHA is faster and more convenient to shape, and the specific heat capacity of the material itself is also higher, so that it can be repeatedly switched between straight hair and curly hair without obvious performance degradation, that is, it has excellent durability for repeated styling. These characteristics give users a better use experience and are more economically valuable.

8. The wig of the present invention has a surface moisture content similar to that of real human hair. This is due to the hydrophilic modification of the wig substrate by the coupling agent and the surfactant, which makes its hygroscopicity slightly better and similar to that of human hair. These two types of additives produce a synergistic effect, and together with the hydrophobic property of PHA itself, the wig strands have the characteristics of being more hydrophilic on the surface and more hydrophobic inside, so that the wig substrate has a more breathable feel, good moisture permeability and moisture content, and is easier to blow dry than human hair, and has more comprehensive properties than human hair.

9. The wig of the present invention mainly uses environmentally friendly, non-toxic, bio-based, and biocompatible reagents as the additives. In particular, when the bio-based surfactant rhamnolipid is used, it is unexpectedly found that it produces a synergistic effect with the main material PHA, making the wig based on PHA more skin-friendly and more moisturizing. The flame retardants used are all phosphorus-based environmentally friendly flame retardants. The reasonable proportion of the compound makes it have excellent flame retardant effect, and at the same time does not affect the mechanical properties of the wig based on PHA.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

Figure 1: Cross-sectional structure of a fake hair strand, where 1-cortex, 2-core, 3-sea component, 4-island component.

Figure 2: A wig made of human hair from a certain brand in Comparative Example 1.

Figure 3: A wig made of protein fiber as the base material of a certain brand in Control Example 2.

Figure 4: A wig made of PAN as the base material from a certain brand in Comparative Example 3.

Figure 5: The wig made in Comparative Example 4.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Tests, specific methods and references used in the examples

1. Testing

1. Basic performance: fineness, single-filament breaking strength;

2. Subjective evaluation: softness, smoothness (straight hair and curly hair are evaluated separately), fluffiness, and glossiness;

3. Processing and use performance: curl fastness, combing resistance, repeated styling durability, single filament breaking strength after curling, dyeing effect, repeated dyeing durability, moisture content;

4. Special properties: antistatic, breathable, flame retardant, heat resistance, antibacterial, anti-mite, degradation rate;

5. Safety and sanitation performance: pH value, formaldehyde content, decomposable aromatic amine content, odor, etc. are comprehensively evaluated for its performance.

2. Test Method

1. Basic performance

Fineness (dtex): The average fineness index of the fiber is calculated by the mid-section cutting and weighing method. The fibers are combed into a fiber bundle with one end flat, parallel and straight, and then a fiber cutter is used to cut a 10mm long fiber bundle in the middle of the fiber. The cut fiber bundle is weighed on a scale and the total number of fibers in the bundle is counted. The average fineness of the fiber can be calculated based on the number of fibers, weight and cut length.

Single fiber breaking strength (cN): Tested in accordance with the method in GB/T 13835.5 "Test methods for rabbit hair fibers Part 5: Single fiber breaking strength and breaking elongation", and the results are calculated using the "9.1" method.

2. Subjective evaluation

Softness, smoothness (straight hair and curly hair were evaluated separately), volume, and glossiness: a subjective evaluation method was used, and two types of people were selected as subjects.

The first category consists of 10 experts or experienced subjects, with a weight of 1. They are familiar with the scales and descriptive terms used in subjective tests, know the human feelings corresponding to each level in the terminology, can quickly and accurately evaluate and quantify the performance of wigs, and are front-line staff or hair product fiber material R&D personnel with more than three consecutive years of working experience in hair product companies;

The other group consists of 10 consumers who have received simple training, with a weight of 0.5. Before the experiment, these subjects need to be given knowledge about fiber performance and explanations of evaluation scale terminology so that they can make a correct evaluation of the performance of wigs and ensure the rigor of the results.

Experimental conditions: temperature 20℃±2℃, relative humidity 65%±2%, wind speed ≤0.1m/s.

The performance evaluation scales and description words are shown in Table 2-5.

Table 2: Subjective evaluation scale for softness

Table 3: Subjective evaluation scale for smoothness

Table 4: Fluffiness subjective evaluation scale

Table 5: Subjective evaluation scale for glossiness

3. Processing and performance

Curl fastness: refers to the property of the curled fiber that the curled shape remains unchanged when subjected to external force. The index of reaction curl fastness is expressed by plastic deformation rate, that is, the percentage of the change in curl length to the fiber length after repeated loading and unloading of the fiber, then:

Plastic deformation rate after the first loading and unloading

Where: L ₀ ——the length of the fiber's natural hanging (mm);

_L1 is the length (mm) of the fiber that is naturally suspended after being unloaded for 2 minutes after being kept under load for the first time for 30 minutes.

Plastic deformation rate after the second loading and unloading

Where: L ₂ ——the length of the fiber that is naturally suspended after being unloaded for 2 minutes after being kept under load for the second time (mm).

By analogy, the plastic deformation rate after the nth loading and unloading is

Where: _Ln is the length of the fiber that is naturally suspended after being unloaded for 2 minutes after being kept under load for the nth time (mm).

In order to more comprehensively characterize the curl fastness of curly hair when subjected to external forces during use, this patent simulates three force models of wig strands, namely:

① Loading and unloading loads to simulate touching or pulling by hand during use. The specific method is as follows:

Take out a single wig that has been shaped, measure its natural hanging length L ₀ , then apply a fixed load (3.67g) to the wig, unload after 30 minutes and recover for 2 minutes, and then measure the length L ₁ of the wig after one loading and unloading. Repeat the loading and unloading process, and measure the lengths L ₂ , L ₃ , L ₄ , L ₅ , L ₆ , and L ₇ of the wig after several loading and unloading in turn, calculate the plastic deformation rate of the wig according to the formula, and take the average value of 5 wigs;

② Combing action (30 times as a cycle), simulating the combing of the wig when using it. The specific method is:

Select a wig bundle (about 300 strands) that has been shaped, measure its natural hanging length L ₀ , and then comb the wig bundle evenly and slowly (10-20 cm/s) from the upper end to the lower end with a comb. Comb the wig bundle for 7 cycles as required by the experiment, 30 times per cycle, with a cycle interval of 2 hours. Measure and record the length of the wig bundle 15 minutes after each cycle, which are L ₁ , L ₂ , L ₃ , L ₄ , L ₅ , L ₆ , and L ₇ , respectively. Calculate the fiber plastic deformation rate according to the formula, and take the average value of the 5 wig bundles;

③Water washing, simulating the washing of wigs when used. The specific method is:

Select the shaped wig strands (about 300 strands), measure their natural hanging length L ₀ , and gently swing the wig strands in a constant temperature water bath, but do not rub them, to ensure the uniformity of the wig strands. Set the water washing temperature to 30°C and the water washing time to 20 minutes. Wash the wig strands 1, 2, 3, 4, 5, 6, and 7 times as required by the experiment, place them horizontally in a 40°C oven for 2 hours, then take them out, measure and record the lengths of the wig strands as L ₁ , L ₂ , L ₃ , L ₄ , L ₅ , L ₆ , and L ₇ , calculate the fiber plastic deformation rate according to the formula, and take the average value of the 5 wig strands. Then:

When ≥4% exists in _Li (i＝1, 2, ..., 7), the curl fastness is judged to be very poor;

When _Li (i＝1, 2, ..., 7) are all <4%, but there is ≥3.25%, the curl fastness is judged to be poor;

When _Li (i＝1, 2, ..., 7) are all <3.25%, but there is ≥2.5%, the curl fastness is judged to be general;

When _Li (i=1, 2, ..., 7) are all <2.5%, but there is ≥1.75%, the curl fastness is judged to be good;

When _Li (i=1, 2, ..., 7) are all <1.75%, the curl fastness is judged to be excellent.

Comb resistance: refers to the wig's ability to adapt to frequent combing, and after being damaged by combing, it can be restored to the properties of the dry and damaged parts by re-processing with an electric flat iron or ironing.

The specific evaluation method is: select 3 wig bundles (about 300 hairs in each bundle) that have been fixed, count the total number of hairs _A0 and the number of damaged hairs _D0 , and then comb the wig bundles evenly (20-40cm/s) from the upper end to the lower end. Comb the wig bundles for 10 cycles as required by the experiment, 50 times per cycle, with a cycle interval of 2h. Count and record the total number of hairs and the number of damaged hairs 15 minutes after each cycle, which are _A1 - _A10 and _D1 - _D10 respectively. Then:

When the Di _{/ Ai} (i=1, 2, ..., 10) of 2 or 3 wig strands is ≥5%, or the Di _/ D _i-1 is ≤95%, the combing resistance of the wig strands is judged to be unqualified;

When Di _{/ Ai} (i=1, 2, ..., 10) of two wig strands are both <5%, and Di _/ D _i-1 are both >95%, the combing resistance of the wig strands can be determined to be qualified;

When Di _{/ Ai} (i=1, 2, ..., 10) of the three wig strands are all <5%, and Di _/ D _i-1 are all >95%, the combing resistance of the wig strands is judged to be good;

For the wig strands judged to be good, they are treated with an electric flat iron or ironed. If the number of damaged hair strands that can be restored is greater than 0.5D ₁₀ , the wig strands are judged to have excellent combing resistance.

Repeated styling durability: refers to the property of the wig that it can adapt to repeated switching between straight hair and curly hair.

The specific evaluation method is: select a straight wig strand that has been styled (about 1000 strands, uniform in fineness), extract 100 wig strands to test its single filament breaking strength, and record the average value as F ₀ . Make curly hair according to the styling process requirements, and after 24 hours, make straight hair according to the styling process requirements again, which is counted as a repeated styling cycle. Perform 5 repeated styling cycles, and extract 100 wig strands to test its single filament breaking strength after each cycle, and record the average values as F ₁ , F ₂ , ..., F ₁₀ . Then:

When F _i /F _i-1 (i=1, 2, ..., 10) is ≤90% or F ₁₀ /F ₀ <60%, the repeated styling durability of the wig is judged to be unqualified;

When F _i /F _i-1 (i=1, 2, ..., 10) are all greater than 90% and 60%≤F ₁₀ /F ₀ <70%, the repeated styling durability of the wig is determined to be qualified;

When F _i /F _i-1 (i=1, 2, ..., 10) are all > 90% and 70% ≤ _{F 10} /F ₀ < 80%, the repeated styling durability of the wig is judged to be good;

When _Fi /Fi _-1 (i=1, 2, ..., 10) are all > 90% and _F10 / _F0 ≥ 80%, the repeated styling durability of the wig is judged to be excellent.

Single filament breaking strength after curling: Select a straight wig strand (about 300 strands, uniform fineness) that has been styled, and make it into curls according to the styling process requirements. After 24 hours, extract 100 wig strands from it and test its single filament breaking strength according to the method in "GB/T 13835.5 Test method for rabbit hair fibers - Part 5: Single fiber breaking strength and elongation at break".

Dyeing/fading effect: refers to the property that the color change degree of the same batch of wigs is uniform after fading or dyeing under the same conditions.

The specific evaluation method is: select 3 bundles of black straight wigs (about 1000 strands, uniform fineness) that have been fixed, fade or dye according to the hair dyeing process requirements, score whether the degree of fading or dyeing change is uniform, and take the average score. Select two types of people (10 in each) as in "2. Subjective evaluation" as subjects. The dyeing/fading effect performance evaluation scale and descriptive vocabulary are shown in Table 6.

Table 6: Staining/fading effect evaluation scale

Repeated dyeing durability: refers to the property that wigs can be faded and dyed; and the same batch of wigs have a uniform color change after being faded or dyed multiple times under the same conditions.

The specific evaluation method is: select 3 bundles of black straight wigs (about 1000 strands, uniform fineness) that have been fixed, fade them first according to the hair dyeing process requirements, and then dye them after 72 hours, which is counted as one dyeing cycle, and repeat the dyeing cycle 3 times (different colors are dyed in each cycle), and evaluate the fading and dyeing effects according to the scale in Table 6 after each cycle. Then:

When each wig strand does not have uniform dyeing in three cycles (i.e., each wig strand has a dyeing effect of less than 4 points in one cycle), the repeated dyeing durability of the wig strand is unqualified;

When the three-cycle dyeing of one or two wig strands is uniform (i.e. the three-cycle dyeing effect of one or two wig strands is ≥ 4 points), the repeated dyeing durability of the wig strands is qualified;

When the three cycles of dyeing of the three wig strands are uniform (i.e., the three cycles of dyeing of the three wig strands are all ≥ 4 points), the repeated dyeing durability of the wig strands is good;

When the three cycles of dyeing of the three wig strands are uniform, and the three cycles of fading are also uniform (i.e., the three cycles of dyeing and fading effects of the three wig strands are both ≥ 4 points), the repeated dyeing durability of the wig strands is excellent.

Moisture: It is evaluated by the contact angle between the wig and deionized water. The smaller the water contact angle, the better the moisture. More than 100 wigs are arranged in parallel and closely to prepare samples. The OCA40 fully automatic fiber contact angle measuring instrument from Data Physics of Germany is used for testing. The results are averaged from 5 different sample points. Then:

When the water contact angle is <30°, the water wettability is judged to be excellent;

When 30≤water contact angle＜45°, the water wettability is judged to be good;

When 45≤water contact angle＜60°, the water wettability is judged to be general;

When 60≤water contact angle＜75°, the water wettability is judged to be poor;

When the water contact angle is greater than 75°, the wettability is judged to be very poor.

4. Special performance

Antistatic property: It is evaluated by mass specific resistance, which refers to the resistance when current passes through a fiber bundle with a length of 1 cm and a mass of 1 g. It is tested using a LFY-405 fiber specific resistance meter, and the result is the average of 5 samples.

Breathability: Test according to the method in GB/T 40357-2021 "Determination of Breathability of Hair Products and Wigs", and take the average value of at least 5 points.

Flame retardancy: The flame retardancy is characterized by the limiting oxygen index, and the test is carried out according to the method in FZ/T 50017-2011 "Test method for flame retardancy of polyester fiber-Oxygen index method".

Heat resistance: Heat resistance is evaluated by the breaking strength of single filament at high temperature (100°C).

Antibacterial property: The test was carried out according to the method in GB/T 20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method" to obtain the inhibition rate against Staphylococcus aureus and Escherichia coli.

Anti-mite property: The repellency rate test was conducted according to the “repellency method” in GB/T 24259-2009 “Evaluation of anti-mite performance of functional fibers”.

Degradation rate:

Degradation rate during use: After 10 people normally use the wig strands (more than 1000 strands) obtained in the corresponding embodiments and control examples (wearing time ≥ 4 hours per day, washing once a day, drying and storing in a plastic bag when not in use, and collecting the fallen wig strands) for 6 months, the mass loss ratio is tested.

The degradation rate after abandonment refers to the test method of "Biodegradability" in EN 13432. The mass proportion of water, carbon dioxide and minerals finally converted into the wig filaments (more than 1000 filaments) obtained in the corresponding embodiments and control examples after 6 months under aerobic composting conditions.

5. Safety and health performance

pH value: Test according to the method in GB/T 7573-2009 “Determination of pH value of aqueous extract of textiles”.

Formaldehyde content: Tested in accordance with the methods in GB/T 2912.1-2009 "Determination of formaldehyde in textiles Part 1: Free and hydrolyzed formaldehyde (water extraction method)" and GB/T 2912.3-2009 "Determination of formaldehyde in textiles Part 3: High performance liquid chromatography".

Decomposable aromatic amine content: Tested according to the methods in GB/T 17592-2011 "Determination of banned azo dyes in textiles" and GB/T23344-2009 "Determination of 4-aminoazobenzene in textiles".

Odor: Tested according to method 5.3.3 in GB/T 23170-2019 Hair Products - Wigs and Headwear.

3. Reference test standards and literature:

Xuchang Hongyang Biochemical Industry Development Co., Ltd. Degradable wig polylactic acid fiber and its production process [P]. CN: 201210406770.7, 2012.

Xuchang Hongyang Biochemical Industry Development Co., Ltd. A biodegradable, antibacterial and flame-retardant PLA wig fiber and its preparation method[P].CN: 202010734342.1,2020.

Xuchang Hongyang Biochemical Industry Development Co., Ltd.. Degradable antibacterial and flame-retardant wig fiber based on PLA and its preparation method[P].CN: 202010734831.7,2020.

Kaneka Chemical Industry Co., Ltd. Improved regenerated collagen fiber and its production method [P]. CN:98117804.9,1998.

Kaneka Chemical Industry Co., Ltd. Regenerated collagen fibers with excellent heat resistance [P]. CN: 00810216.3, 2000.

Chen Weitai, Sun Runjun. Study on tensile mechanical properties of wig fibers[J]. Journal of Xi'an Polytechnic University, 2010, (1): 21-25

Li Ke, Ye Ting, Jiang Jing, Wang Shaofei. Preparation and performance study of protein/cellulose blended yarn for wigs[J]. Shanghai Textile Science and Technology, 2018, Vol. 46(2): 14-18, 21

Chen Wenjun. Research on the structure and properties of wig fibers[D]. Xi'an Polytechnic University, 2016.

Zheng Yang,Chen JC,Ma YM,Chen GQ.Engineering Biosynthesis ofPolyhydroxyalkanoates(PHA) for Diversity and Cost Reduction.MetabolicEngineering 58(2020)82-93(10.1016/j.ymben.2019.07.004)

GB/T 2912.1-2009, Determination of formaldehyde in textiles - Part 1: Free and hydrolyzed formaldehyde (water extraction method)[S].

GB/T 2912.3-2009, Determination of formaldehyde in textiles Part 3: High performance liquid chromatography[S].

GB/T 7573-2009, Determination of pH value of aqueous extract of textiles[S].

GB/T 13835.5-2009, Test methods for rabbit hair fibres Part 5: Single fibre breaking strength and elongation at break[S].

GB/T 17592-2011, Determination of banned azo dyes in textiles[S].

GB/T 20944.3-2008, Evaluation of antimicrobial properties of textiles Part 3: Oscillation method[S].

GB/T 23170-2019, Hair products - Wigs and headwear[S].

GB/T 23344-2009, Determination of 4-aminoazobenzene in textiles[S].

GB/T 24259-2009, Evaluation of anti-mite performance of functional fibers[S].

GB/T 40357-2021, Determination of air permeability of hair products and wigs[S].

FZ/T 50017-2011, Test method for flame retardancy of polyester fiber-Oxygen index method[S].

T/ZZB 1605-2020, Flame retardant polyester hair for wigs[S].

Example 1

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85=120°C, the stretching and winding speed is 200-640m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 25-60 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 30-65 minutes, thus obtaining a wig with PHA as the base material.

Example 2

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 50 parts of P3HB4HB (4HB molar content 5%), 12.5 parts of P3HB4HB (4HB molar content 20%), 0.5 parts of chain extender LK4468, 0.625 parts of chain extender ADR4400, 0.5 parts of antioxidant 1024, 0.25 parts of antioxidant 1076, 0.375 parts of tungsten disulfide, 0.375 parts of boron nitride, 1.25 parts of Nano-silicon dioxide HB-630, 0.75 parts of calcium stearate, 0.5 parts of magnesium stearate, 0.375 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.375 parts of silane coupling agent KH550, 0.375 parts of anti-hydrolysis agent HD900A, 0.375 parts of anti-hydrolysis agent 936, 0.3 parts of polyvinyl alcohol-2099, 0.45 parts of rhamnolipid, 3.5 parts of triphenyl phosphate, 1.5 parts of toluene diphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is used, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 13 parts of P3HB4HB (4HB molar content 15%), 16 parts of PPC, 6 parts of soy protein fiber, 0.375 parts of chain extender LK4468, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1024, 0.25 parts of antioxidant 1076, 1.5 parts of hollow glass microspheres, 0.5 parts of carbon nanotubes, 0.4 parts of calcium stearate, 0.35 parts of heat stabilizer DP1100, 0.25 parts of titanate coupling agent AT1618, 0.25 1. 2 parts of maleic anhydride, 0.25 parts of silane coupling agent KH550, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent 936, 0.2 parts of polyvinyl alcohol-2099, 0.3 parts of rhamnolipid, 2.75 parts of triphenyl phosphate, 1.25 parts of toluene diphenyl phosphate, and 4 parts of masterbatch are physically mixed, melted and cooled to granulate by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer pellets;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 25-60 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 30-65 minutes, thus obtaining a wig with PHA as the base material.

Example 3

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 5 parts of P3HB4HB (4HB molar content 5%), 57.5 parts of P3HB4HB (4HB molar content 10%), 0.4 parts of chain extender 6901, 0.725 parts of chain extender ADR4400, 0.4 parts of antioxidant 1024, 0.35 parts of antioxidant T501, 0.375 parts of tungsten disulfide, 0.3 parts of carbon nanotubes, 1.325 parts of nano-silica HB-630, 0.625 parts of zinc stearate, 0.625 parts of barium stearate, 0.25 parts of coupling agent BYKC8003, 0.375 parts of maleic anhydride, 0.375 parts of silane coupling agent A-172, 0.375 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of anti-hydrolysis agent 936, 0.45 parts of rhamnolipid, 0.3 parts of benzyltriethylammonium chloride, 2.5 parts of ammonium polyphosphate, 2.5 parts of toluene diphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-185°C, annular blowing is used, and the air supply temperature is 50-60°C to obtain outer layer granules;

Step 2: weigh 15 parts of P3HB4HB (4HB molar content 15%), 12 parts of seaweed fiber, 8 parts of PBS, 0.3 parts of chain extender 6901, 0.575 parts of chain extender ADR4400, 0.4 parts of antioxidant 1024, 0.35 parts of antioxidant T501, 1.375 parts of hollow glass microspheres, 0.375 parts of tungsten disulfide, 0.25 parts of nano titanium dioxide, 0.3 parts of calcium stearate, 0.45 parts of methyl thioglycolate, 0.2 parts of coupling agent BYKC8003, 0.275 parts of maleic anhydride, 0.275 parts of silane coupling agent A-172, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of anti-hydrolysis agent 936, 0.3 parts of rhamnolipid, 0.2 parts of benzyltriethylammonium chloride, 2 parts of ammonium polyphosphate, 2 parts of toluene diphenyl phosphate, and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 25-60 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 30-65 minutes, thus obtaining a wig with PHA as the base material.

Example 4

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: weigh 15 parts of P3HB4HB (4HB molar content 10%), 10 parts of PBA, 10 parts of PBT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 25-60 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 30-65 minutes, thus obtaining a wig with PHA as the base material.

Example 5

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: weigh 10.5 parts of P3HB4HB (4HB molar content 20%), 15 parts of PLA, 9.5 parts of regenerated cellulose, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of Maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 parts of rhamnolipid, 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate, and 4 parts of masterbatch are physically mixed, melted and cooled to granulate by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 25-60°C to obtain inner layer pellets;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

Comparative Example 1

A certain brand of wigs made from human hair (see Figure 2).

Comparative Example 2

A certain brand of wig made with protein fiber as the base material (see Figure 3).

Comparative Example 3

A wig made of PAN from a certain brand (see Figure 4).

Comparative Example 4 (Compared with Example 1, without P3HB4HB)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 27.5 parts of PBAT, 35 parts of PLA, 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol by mass. -6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 150-190°C, annular blowing is used, and the air supply temperature is 50-60°C to obtain outer layer granules;

Step 2: Weigh 24 parts of PLA, 11 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 parts of rhamnolipid, 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules through a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device to melt, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure is respectively sprayed out to form the skin/sea component and the core/island component of the composite pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain the composite pre-oriented yarn;

Step 4: Cool the composite pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: feeding the composite pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 7: inspecting, grading and packaging the full rolls obtained in step 6 to obtain composite wigs;

The composite wig is subjected to beating, three-machine process, post-processing, styling, moisture regaining and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105° C., and the styling time is 25-60 minutes; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118° C., and the styling time is 30-65 minutes, and the wig is obtained (see Figure 5).

Comparative Example 5 (Compared with Example 1, the wig is not a skin-core or island-in-the-sea structure)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 1.125 parts of chain extender X-U993, 0.875 parts of chain extender ADR4400, 1 part of antioxidant 1010, 0.5 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of nano-silica HB-630, 1 part of calcium stearate, 1 part of zinc stearate, 0.75 parts of titanate coupling agent AT1618, 0.5 1. 2. 0.5 parts of maleic anhydride, 0.5 parts of silane coupling agent KH570, 0.5 parts of anti-hydrolysis agent HD900A, 0.75 parts of anti-hydrolysis agent BTWR-500, 0.625 parts of polyethylene glycol-6000, 0.625 parts of rhamnolipid, 3.5 parts of ammonium polyphosphate, 5.5 parts of triphenyl phosphate, and 9 parts of masterbatch are physically mixed, melted and cooled to granulate by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain pellets;

Step 2: After the pellets are vacuum dried at 70-100°C for 2-3h, they are injected into an extrusion device with a heating device to melt, and melt-extruded through a screw. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 3: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 4: The composite PHA pre-oriented yarn obtained by cooling in step 3 is subjected to oiling treatment via an oil roller;

Step 5: feeding the composite PHA pre-oriented yarn obtained by oiling in step 4 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 6: The full roll obtained in step 5 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 25-60 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 30-65 minutes, thus obtaining a wig with PHA as the base material.

Comparative Example 6 (Compared with Example 1, the setting time is different)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: feeding the composite PHA pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 1-5 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 90-120 minutes, thus obtaining a wig with PHA as the base material.

Comparative Example 7 (Compared with Example 1, the setting temperature is different)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 120-140℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 125-148℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

Comparative Example 8 (Compared with Example 1, the inner substrate does not contain P3HB4HB)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 22 parts of PLA, 13 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 parts of rhamnolipid, 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules through a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

Comparative Example 9 (Compared with Example 1, the outer layer substrate is not pure P3HB4HB, and is partially replaced by PBS)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: weigh 27.5 parts of P3HB4HB (4HB molar content 8%), 35 parts of PBS, 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of nano-silica HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-185°C, annular blowing is used, and the air supply temperature is 50-60°C to obtain outer layer granules;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: The composite PHA pre-oriented yarn obtained by oiling in step 5 is fed into a hot roller and a winding device for stretching and winding, the stretching temperature is controlled to be 85-120° C., the stretching and winding speed is 200-640 m/min, and the stretching ratio is 2.5-4, and the obtained finished yarn is wound on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

Comparative Example 10 (Compared with Example 1, no coupling agent was added)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 parts of 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled to granulate by a twin-screw extruder, the barrel temperature is set to 155-185°C, annular blowing is used, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: feeding the composite PHA pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair is styled in a steam cabinet, the temperature is generally 70-105°C, and the styling time is 25-60 minutes; the straight hair is styled in a steam cabinet, the temperature is generally 80-118°C, and the styling time is 30-65 minutes, thus obtaining a wig with PHA as the base material.

Comparative Example 11 (Compared with Example 1, no surfactant was added)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled to granulate by a twin-screw extruder, the barrel temperature is set to 155-185°C, annular blowing is used, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate, and 4 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer pellets;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: feeding the composite PHA pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

Comparative Example 12 (Compared with Example 1, rhamnolipid was replaced with sodium petroleum sulfonate)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of sodium petroleum sulfonate, 2 parts of ammonium polyphosphate, 3 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1.5 parts of ammonium polyphosphate, 2.5 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set at 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: feeding the composite PHA pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

Comparative Example 13 (Compared with Example 1, the ratio of flame retardant is different)

Each raw material is vacuum dried at 70-100°C for 8-10 hours to control the moisture content below 0.5%;

Step 1: Weigh 62.5 parts of P3HB4HB (4HB molar content 8%), 0.625 parts of chain extender X-U993, 0.5 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 0.25 parts of tungsten disulfide, 0.5 parts of titanium boride, 1.25 0.5 parts of nano-silicon dioxide HB-630, 0.5 parts of calcium stearate, 0.75 parts of zinc stearate, 0.5 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.5 parts of anti-hydrolysis agent BTWR-500, 0.375 parts of polyethylene glycol-6000, 0.375 parts of rhamnolipid, 0.5 parts of ammonium polyphosphate, 4.5 parts of triphenyl phosphate, and 5 parts of masterbatch are physically mixed, melted and cooled by a twin-screw extruder to granulate, the barrel temperature is set to 155-185°C, annular blowing is adopted, and the air supply temperature is 50-60°C to obtain outer layer pellets;

Step 2: Weigh 16 parts of P3HB4HB (4HB molar content 15%), 12 parts of PLA, 7 parts of PBAT, 0.5 parts of chain extender X-U993, 0.375 parts of chain extender ADR4400, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 1076, 1.25 parts of hollow glass microspheres, 0.75 parts of boron nitride, 0.5 parts of calcium stearate, 0.25 parts of zinc stearate, 0.25 parts of titanate coupling agent AT1618, 0.25 parts of maleic anhydride, 0.25 parts of silane coupling agent KH570, 0.25 parts of anti-hydrolysis agent HD900A, 0.25 parts of anti-hydrolysis agent BTWR-500, 0.25 parts of polyethylene glycol-6000, 0.25 1. 2 parts of rhamnolipid, 0.4 parts of ammonium polyphosphate, 3.6 parts of triphenyl phosphate and 4 parts of masterbatch are physically mixed, melted and cooled into granules by a twin-screw extruder, the barrel temperature is set to 155-200°C, annular blowing is used, and the air supply temperature is 30-55°C to obtain inner layer granules;

Step 3: After the outer layer pellets and the inner layer pellets are vacuum dried at 70-100°C for 2-3h, they are respectively injected into an extrusion device with a heating device for melting, and melt-extruded by a screw, and a composite spinneret assembly with a skin-core or sea-island structure (see Figure 1) is respectively ejected to form the skin/sea component and the core/island component of the composite PHA pre-oriented yarn. The spinning temperature is set to 125-175°C, the pressure in the melt metering pump is controlled to 10-15MPa, and the spinning speed is 80-160m/min to obtain a composite PHA pre-oriented yarn;

Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long annular air tunnel with an air supply temperature of 30-55°C;

Step 5: The composite PHA pre-oriented yarn obtained by cooling in step 4 is subjected to oiling treatment via an oil roller;

Step 6: feeding the composite PHA pre-oriented yarn obtained by oiling in step 5 into a hot roller and a winding device for stretching and winding, controlling the stretching temperature to be 85-120° C., the stretching and winding speed to be 200-640 m/min, and the stretching ratio to be 2.5-4, and winding the obtained finished yarn on a bobbin;

Step 7: The full roll obtained in step 6 is inspected, graded, and packaged to obtain the composite PHA wig;

The composite PHA wig is subjected to beating, three-machine process, post-processing, styling, moisture recovery and packaging. The curly hair styling adopts a steam cabinet styling, the temperature is generally 70-105℃, and the styling time is 25-60min; the straight hair styling adopts a steam cabinet styling, the temperature is generally 80-118℃, and the styling time is 30-65min, thus obtaining a wig with PHA as the base material.

The test results of the embodiments and control examples are shown in Tables 7-8. Except for the curling performance and the items with annotations, the unannounced items are all the straight hair test results.

Table 7: Test results of Examples 1-5 and Comparative Examples 1-5

Table 8: Test results of Example 1 and Comparative Examples 6-13

The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims (10)

1. A wig, characterized in that the wig includes an outer structure and an inner structure; The outer layer structure includes an outer base material and an outer auxiliary material, and the outer base material includes P3HB4HB; The inner layer structure includes an inner base material and an inner auxiliary material, and the inner base material includes P3HB4HB. 2. The wig according to claim 1, characterized in that the 4HB molar content in the P3HB4HB is between 0-20%. Preferably, the outer base material includes P3HB4HB with different 4HB molar content. One or a combination of two or more. 3. The wig according to claim 1 or 2, characterized in that the inner base material also includes PBAT, PBS, PBA, PBT, PLA, PPC, regenerated cellulose, seaweed fiber or soy protein fiber. One or a combination of two or more. 4. The wig according to claim 3, characterized in that the inner base material is selected from any of the following groups: A) P3HB4HB, PLA and PBAT, wherein the mass ratio of P3HB4HB, PLA and PBAT is (10-20): (10-15): (5-10); B) P3HB4HB, PPC and soybean protein fiber, wherein the mass ratio of P3HB4HB, PPC and soybean protein fiber is (10-15): (10-20): (5-10); C) P3HB4HB, seaweed fiber and PBS, wherein the mass ratio of P3HB4HB, seaweed fiber and PBS is (10-20): (10-15): (5-10); D) P3HB4HB, PBA and PBT, wherein the mass ratio of P3HB4HB, PBA and PBT is (10-25): (10-20): (10-20); E) P3HB4HB, PLA and regenerated cellulose, wherein the mass ratio of P3HB4HB, PLA and regenerated cellulose is (5-15): (10-25): (5-15). 5. The wig according to any one of claims 1 to 4, characterized in that the outer layer auxiliary material or the inner layer auxiliary material independently includes a heat stabilizer, a chain extender, an antioxidant, a nucleating agent, One or a combination of two or more coupling agents, anti-hydrolysis agents, flame retardants, surfactants or masterbatch. 6. The wig according to claim 5, wherein, The heat stabilizer is selected from one or more of calcium stearate, zinc stearate, magnesium stearate, barium stearate, methyl thioglycolate, and heat stabilizer DP1100; The chain extender is selected from one or more of chain extender X-U993, chain extender LK4468, chain extender ADR4400, and chain extender 6901; The antioxidant is selected from one or more of antioxidant 1010, antioxidant 1024, antioxidant 1076, and antioxidant T501; The nucleating agent is selected from one or more of tungsten disulfide, titanium boride, boron nitride, nano-titanium dioxide, nano-silica HB-630, hollow glass beads, and carbon nanotubes; The coupling agent is selected from one or more of titanate coupling agent AT1618, maleic anhydride, coupling agent BYKC8003, silane coupling agent A-172, silane coupling agent KH550, and silane coupling agent KH570. ; The anti-hydrolysis agent is selected from one or more types of anti-hydrolysis agent 936, anti-hydrolysis agent HD900A, and anti-hydrolysis agent BTWR-500; The flame retardant is selected from one or more types of ammonium polyphosphate, triphenyl phosphate, and diphenyl toluene phosphate; The surfactant is selected from one or more types of polyethylene glycol, polyvinyl alcohol, rhamnolipids, and quaternary ammonium salt type surfactants; further, the polyethylene glycol is polyethylene glycol-3000 , one or more of polyethylene glycol-6000, polyethylene glycol-10000, polyethylene glycol-20000; polyvinyl alcohol is polyvinyl alcohol 1799, polyvinyl alcohol 2099, polyvinyl alcohol 2499, polyethylene One or more alcohols 2699; quaternary ammonium salt surfactants are benzyltriethylammonium chloride, dodecyldimethylammonium chloride, cetyltrimethylammonium chloride, One or more types of octadecyltrimethylammonium chloride; The color masterbatch is P3HB4HB base color masterbatch with different colors added as needed. 7. The wig according to any one of claims 1 to 6, characterized in that the structure of the wig is a sheath-core type or an island-in-the-sea type, wherein the outer layer structure is a cortex or sea component, and the inner layer structure is a core layer. or island component. 8. A method for preparing a wig according to any one of claims 1 to 7, characterized in that the preparation method includes separately melting and granulating the outer layer structure and the inner layer structure, and then performing spinning, cooling, and coating. Oil and stretch winding. 9. The preparation method according to claim 8, characterized in that the preparation method includes the following steps: Step 1: In terms of mass parts, weigh 35-90 parts of the outer base material and 0-36 parts of the outer auxiliary material, mix them, melt and cool them through a twin-screw extruder, and set the barrel temperature to 130 -210℃, use ring blowing air, the air supply temperature is 18-65℃, and obtain the outer layer of pellets; Step 2: Weigh 10-60 parts of the inner base material and 0-29 parts of the inner auxiliary material in terms of mass parts, mix them, melt and cool them through a twin-screw extruder, and set the barrel temperature to 130 -210℃, use ring blowing, and the air supply temperature is 18-65℃ to obtain the inner layer of pellets; Step 3: Vacuum-dry the obtained outer layer pellets and inner layer pellets, inject them into the extrusion equipment with a heating device for melting, and melt and extrud through the screw, with a composite spinneret assembly of skin-core or island-type structure. , so that the outer layer of material particles corresponds to the cortex or sea component, and the inner layer of material particles corresponds to the core layer/island component to form a complete composite PHA pre-oriented yarn, in which the spinning temperature is set to 120-210°C. The pressure inside the melt metering pump is controlled at 8-17MPa, and the spinning speed is 80-160m/min; Step 4: Cool the composite PHA pre-oriented yarn through a vertical 1-2m long circular blowing air tunnel, where the air supply temperature is 18-65°C; Step 5: Oil the composite PHA pre-oriented yarn cooled in Step 4 through an oil roller; Step 6: Send the composite PHA pre-oriented yarn oiled in Step 5 to the hot roller and winding device for stretch and winding. Control the stretching temperature to 70-120°C and the stretching and winding speed to 200-640m/ min, the drawing ratio is 2.5-4, and the obtained finished yarn is wound on the bobbin; Preferably, it also includes whipping and shaping the finished yarn obtained in step six. 10. The preparation method according to claim 9, characterized in that the styling is curly hair styling or straight hair styling; wherein, The curly hair styling method uses a steam cabinet for styling, the temperature is 60-118°C, and the styling time is 15-70 minutes; The straight hair styling method uses a steam cabinet for styling, the temperature is 70-125℃, and the styling time is 20-75 minutes.