CN114277462B - Easily degradable coated yarn and preparation method thereof - Google Patents
Easily degradable coated yarn and preparation method thereof Download PDFInfo
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- CN114277462B CN114277462B CN202111585938.0A CN202111585938A CN114277462B CN 114277462 B CN114277462 B CN 114277462B CN 202111585938 A CN202111585938 A CN 202111585938A CN 114277462 B CN114277462 B CN 114277462B
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- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Artificial Filaments (AREA)
Abstract
The invention discloses an easily degradable coated yarn and a preparation method thereof, wherein the coated yarn comprises a core layer and a skin layer: the core layer material is PLA composite material; the cortex material is a PBAT/PBS/PCL reactive blend material. The coated yarn provided by the invention adopts the PLA composite material as the core layer, the PBAT/PBS/PCL reactive blending material as the skin layer, the core layer and the skin layer are both degradable environment-friendly materials, the prepared coated yarn has good toughness, heat resistance and heat shrinkage resistance, good deformation resistance and outstanding heat insulation effect, can be completely degraded in a period of time in a natural environment after being used, does not cause burden to the environment, and has good economic benefit and environment-friendly benefit.
Description
Technical Field
The invention relates to the technical field of textile, in particular to an easily degradable coated yarn and a preparation method thereof.
Background
With advances in synthetic fiber spinning technology and improvements in consumer level, new demands are being placed on the characteristics of synthetic fibers and their textiles. The coated yarn is used as a new excellent synthetic fiber, and the market demand for the product is great.
The common coating yarn in the market at present comprises nylon ammonia air coating yarn, polyester coating yarn and the like. The nylon-ammonia air-coated yarn is a special yarn which is popular in the market in recent years. The polyurethane fiber is wrapped and compounded with nylon filaments by taking polyurethane filaments as cores. The interweaving of the spandex and the chinlon not only can lead the fabric to be dyed at normal temperature and normal pressure and avoid the damage of high temperature and high pressure to the fabric, but also leads the knitted fabric to have the advantages of moisture absorption and ventilation, soft hand feeling, elasticity and resilience, meets the requirements of people on comfort in wearing clothing, close fitting and unchanged appearance, and is widely used for socks, underwear, sportswear and the like. The polyester covered yarn generally refers to PVC blend evenly covered on the periphery of high-strength polyester filaments to form PVC/PET characteristic composite core-spun yarn. The fabric obtained by adopting the silk as the warp and weft yarn has the advantages of combining the PVC coated polyester yarns, has excellent strength and wear resistance, and has certain flame retardance. The fabric is widely applied to sun-shading, furniture and other outdoor articles.
However, the coated yarn preparation materials such as PVC provided in the prior art have poor degradability, high recovery cost, and large environmental pollution, and cannot meet the concept of green and environment-friendly development.
For example, chinese patent application No. [ CN201910367829.8 ] discloses a PVC coated modified polyester yarn and a method for producing the same, which includes the steps of: preparing styrene solution of SEBS, immersing the polyester filaments in the solution for 2-5 hours, taking out and drying to obtain surface modified polyester filaments; PVC plastic master batch is put into a plastic extruder, plasticized into uniform melt through an extrusion system of the plastic extruder, and extruded into a machine head; and (3) enabling the surface-modified polyester filaments to pass through a plastic extruder head, enabling the extruded PVC melt to be coated on the outer layer of the surface-modified polyester filaments, and cooling to obtain the PVC coated modified polyester filaments.
The PVC coated modified polyester yarn prepared by adopting PVC as a coating material has excellent strength and usability, but the PVC plastic is difficult to degrade, so that the PVC coated modified polyester yarn has large environmental pollution and low environmental protection, and cannot meet the environmental protection requirement.
In order to prepare the degradable coated yarn, a biodegradable polymer material can be used for preparing the coated yarn, wherein the biodegradable polymer material is a polymer material which can be degraded by microorganisms or secretion thereof under the action of enzyme or chemical decomposition under certain time and certain conditions. Japanese definition of biobased polymers in 2003 is: polymers made from renewable resources (e.g., starch, cellulose, etc.) carbon dioxide and biopolymers (e.g., polysaccharides, polyesters, polypentadienes, polyphenols, and their derivatives, mixtures, composites, etc.) as raw materials. Most biodegradable polymer materials are materials prepared from natural polymer materials or synthesized from bio-based monomers. The biodegradable material obtained by using abundant biomass resources can be degraded by microorganisms or secretion thereof in nature after being abandoned, and finally is decomposed into water, carbon dioxide and other small molecular substances which are nontoxic and harmless to the environment and human beings. The method not only reduces the dependence on petroleum and other energy sources, but also avoids the pollution and damage to the environment to a great extent. Meanwhile, the PVC-free water-based paint does not contain toxic substances such as PVC and the like, and is more beneficial to human health in the use process.
Disclosure of Invention
In order to solve the problems, the invention provides the easily degradable coated yarn and the preparation method thereof, the coated yarn adopts the PLA composite material as the core layer, the PBAT/PBS/PCL reactive blending material as the skin layer, the core layer and the skin layer are both easily degradable environment-friendly materials, the prepared coated yarn has good toughness, heat resistance and heat shrinkage resistance, good deformation resistance, outstanding heat insulation effect, can be completely degraded in natural environment for a period of time after being used, does not cause burden to the environment, and has good economic benefit and environmental benefit.
In order to achieve the aim of the invention, the invention is realized by the following technical scheme: in one aspect, the invention provides an easily degradable coated wire comprising a core layer and a skin layer:
the core layer material is PLA composite material;
the cortex material is a PBAT/PBS/PCL reactive blend material.
The invention adopts PLA composite material to prepare the core layer of the coated wire. Polylactic acid (PLA) is a novel biodegradable material made from starch raw materials proposed by renewable plant sources such as corn. The starch material is saccharified to obtain glucose, and glucose and certain strain are fermented to prepare high purity lactic acid, and the polylactic acid with certain molecular weight is synthesized through chemical synthesis. The water-soluble organic compound has good biodegradability, can be completely degraded by microorganisms in the nature after being used, finally generates carbon dioxide and water, does not pollute the environment, and is very beneficial to protecting the environment. The common plastic treatment method is still incineration and cremation, so that a large amount of greenhouse gases are discharged into the air, the polylactic acid plastic is buried in the soil and is degraded, and the generated carbon dioxide directly enters the soil organic matters or is absorbed by plants, so that the carbon dioxide is not discharged into the air, and the greenhouse effect is not caused.
But PLA has poor toughness and poor heat resistance, and the cost for independently preparing the core layer is higher and the mechanical property is poorer. Therefore, the core layer is prepared by adopting the PLA composite material, and the mechanical property of the PLA is improved by carrying out composite modification treatment on the PLA.
Preferably, the PLA composite material is a PLA/modified mica powder composite material, and the preparation method of the PLA/modified mica powder composite material comprises the following steps: and (3) melting and blending the dried PLA and the modified mica powder in a double-screw extruder to prepare the PLA/modified mica powder composite material, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 20r/min.
Mica powder is a nonmetallic mineral and contains multiple components, mainly SiO 2 The content is generally about 49%, al 2 O 3 The content is about 30%. The mica powder has good elasticity and toughness. The mica powder is silicate with a layered structure, and the structure is a compound silica layer formed by sandwiching one layer of aluminum oxide octahedron by two layers of silica tetrahedrons.
The diameter-thickness ratio of the mica powder and the length-diameter ratio of the fibrous filler, the particle filler is like sand and stone in concrete, plays a role in reinforcing steel bars, and the mechanical property of the mica powder can be effectively improved by adding the mica powder into PLA. Meanwhile, the mica powder has good infrared radiation capability, can cause excellent heat radiation effect, and effectively improves heat resistance.
Due to the structural nature of the mica powder, when added to PLA, forming a substantially parallel alignment within the PLA system, penetration of the system by water and other corrosive substances is strongly blocked, especially in the case of fine quality mica powder (at least 50 times, preferably more than 70 times the diameter-thickness ratio of the wafer), and the time for water and other corrosive substances to penetrate the plastic film is typically prolonged by a factor of 3. Since mica powder fillers are much cheaper than seed resins, they have very high economic value. In the molding process, mica wafers are laid down by surface tension before PLA solidification, automatically forming structures that are parallel to each other and also parallel to the PLA surface. The layer-by-layer arrangement has the orientation which is exactly perpendicular to the penetrating direction of corrosive substances into the system, so that the mica powder can fully play the blocking function.
Therefore, in the invention, the PLA composite material is a PLA/modified mica powder composite material, and the preparation method of the PLA/modified mica powder composite material comprises the following steps: and (3) melting and blending the dried PLA and the modified mica powder in a double-screw extruder to prepare the PLA/modified mica powder composite material, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 20r/min.
Preferably, the mass ratio of the PLA to the modified mica powder is 100: (5-7).
The mica powder has poor dispersibility in a PLA system due to smaller lamellar spacing, and a large amount of agglomeration phenomenon exists. Therefore, the invention carries out modification treatment on the mica powder.
In the invention, the modified mica powder is cationic modified mica powder.
Preferably, the preparation method of the cationic modified mica powder comprises the following steps: mixing mica powder, deionized water and a cationic modifier in a three-neck flask, stirring for 1.5h in a water bath at 75 ℃, cooling, standing, filtering, cleaning, drying and grinding to obtain the cationic modified mica powder.
Preferably, the mass ratio of the mica powder to the deionized water to the cationic modifier is 100:500: (2-5).
Preferably, the cationic modifier is octadecyl trimethyl ammonium bromide.
In the invention, the positive charge group carried by the octadecyl trimethyl ammonium bromide and cations between mica powder sheets can be subjected to exchange reaction, and the organic long chain weakens the interlayer effect of the mica powder, so that the interlayer spacing of the sheets is enlarged, and the section is uneven. In the PLA forming process, the macromolecular chains of the PLA can gradually enter the mica powder sheet layers to form an intercalation structure of the PLA and the mica powder, so that the mica powder is uniformly dispersed in the PLA, and the breaking elongation and the impact strength of the PLA composite material are improved.
Secondly, the cortex material is a PBAT/PBS/PCL reactive blend material.
PBAT is a thermoplastic biodegradable plastic. The PBAT is a copolymer of the adipic acid butanediol ester and the terephthalic acid butanediol ester, has the characteristics of PBA and PBT, has good ductility and elongation at break, has good heat resistance and impact resistance, and has good biodegradability.
PBS as biodegradable plastic has the characteristics of low price, excellent mechanical property and the like, and the PBS also has the characteristics of convenient processing, suitability for the conventional plastic processing technology and good heat resistance, and the heat deformation temperature can exceed 100 ℃. And the source of the raw materials for PBS synthesis can be petroleum resources, and can also be obtained by fermenting biomass resources, and the source is wide and easy to obtain.
PCL polycaprolactone is a thermoplastic crystalline polyester obtained by ring-opening polymerization of caprolactone by taking dihydric alcohol as an initiator. PCL is a white opaque solid, has certain rigidity and strength, is typical resin characteristics, has good compatibility with high polymer materials, and can also be used as a modifier to improve certain properties of other high polymers; is easy to be dissolved in toluene, tetrahydrofuran, ethyl acetate, methylene dichloride and other solvents, and is easy to form a film. Because the PCL has 5 nonpolar methylene and one polar ester group on the structural repeating unit, the PCL has good flexibility and processability, and the product has shape memory. However, PCL has problems such as insufficient mechanical strength and poor heat resistance.
Therefore, the PBAT, the PBS and the PCL are blended according to a certain weight ratio to prepare the cortex material, and the PBAT and the PBS have good flexibility and heat resistance compared with the PCL, so that the problem of poor heat resistance of the PCL can be effectively solved by introducing the PBAT and the PBS, and the production cost of the base material can be reduced.
However, the PBAT, the PBS and the PCL are all macromolecular polymers, the compatibility of the PBAT, the PBS and the PCL is poor, and the PBAT, the PBS and the PCL cannot be quickly combined after being compounded, so that the dispersibility of a system is poor.
Preferably, the preparation method of the PBAT/PBS/PCL reactive blend material comprises the following steps: and (3) mixing PBAT, PBS, PCL, putting into a vacuum drying oven for drying, adding a compatilizer and an initiator, uniformly stirring, and extruding in a double-screw extruder to obtain the PBAT/PBS/PCL reactive blend material.
Preferably, the compatilizer is glycidyl methacrylate, and the initiator is dicumyl peroxide.
Preferably, the mass ratio of PBAT, PBS, PCL, the compatilizer and the initiator is as follows: (30-40): 30:30: (2-3): 5.
according to the invention, glycidyl methacrylate and dicumyl peroxide are added into a blend system of PBAT, PBS and PCL, so that on one hand, the compatilizer can play a role of plasticization, is similar to a lubricant, the barrier effect between large chains is reduced, mutual sliding is easier, and on the other hand, under the action of an initiator, the epoxy functional group of the compatilizer acts on hydroxyl end groups and carboxyl groups in the blend system, so that the interaction degree between macromolecules of three materials is improved, the compatibility is improved, and meanwhile, the PCL and the PBS play a role of diluting the PBAT, so that the free volume of the macromolecules of the PBAT is increased, the molecular chain movement is easier, and the dispersibility of the blend system is more uniform.
In another aspect, the invention provides a method for preparing an easily degradable coated yarn, comprising the steps of:
s1, extruding a cortex material into a die in a molten state through an extruder;
s2, obtaining a blending core wire by a core layer material through a spinning process, arranging the blending core wire on a creel, providing 20cN tension for the blending core wire through a filtering tensiometer, inputting the blending core wire into a photoelectric device, and treating the blending core wire for 0.25S at 170 ℃ by utilizing corona and plasma generated by the photoelectric device to obtain a surface activated blending core wire;
and S3, drawing the surface-activated blending core wire obtained in the step S2 into a die, coating the blending core wire by using the molten cortex material in the step S1 to obtain a sheath-core composite fiber, and finally cooling, dewatering and demisting the sheath-core composite fiber, and winding to obtain the degradable coating wire.
Compared with the prior art, the invention has the following beneficial effects:
1. the degradable coated yarn provided by the invention adopts the PLA composite material as the core layer and the PBAT/PBS/PCL reactive blending material as the skin layer, the core layer and the skin layer are both degradable environment-friendly materials, the prepared coated yarn has good toughness, heat resistance and heat shrinkage resistance, good deformation resistance and outstanding heat insulation effect, can be completely degraded in a period of time in a natural environment after being used, does not cause burden to the environment, and has good economic benefit and environmental benefit.
2. According to the degradable coated yarn provided by the invention, the PLA/modified mica powder composite material is used as the core material, and the mechanical property of the degradable coated yarn can be effectively improved by adding the modified mica powder into the PLA. Meanwhile, the mica powder has good infrared radiation capability, can cause excellent heat radiation effect, and effectively improves heat resistance.
Drawings
FIG. 1 is a flow chart of a method for preparing an easily degradable coated wire according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following description will explain specific embodiments of the present invention with reference to the accompanying drawings.
It is obvious that the drawings in the following description are only examples of the invention, from which other drawings can be obtained and from which other embodiments can be obtained without inventive effort for a person skilled in the art, and that the invention is not limited to these examples.
The specific embodiment of the invention is as follows:
example 1
An easily degradable coated yarn comprising a core layer and a skin layer:
the core layer material is PLA/modified mica powder composite material;
the cortex material is a PBAT/PBS/PCL reactive blend material.
In this embodiment:
the preparation method of the PLA/modified mica powder composite material comprises the following steps: and (3) melting and blending the dried PLA and the modified mica powder in a double-screw extruder to prepare the PLA/modified mica powder composite material, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 20r/min. Wherein, the mass ratio of PLA to modified mica powder is 100:5.
the modified mica powder is cationic modified mica powder, and the preparation method of the cationic modified mica powder comprises the following steps: mixing mica powder, deionized water and a cationic modifier in a three-neck flask, stirring for 1.5h in a water bath at 75 ℃, cooling, standing, filtering, cleaning, drying and grinding to obtain the cationic modified mica powder. Wherein, the mass ratio of the mica powder to deionized water to the cationic modifier is 100:500:2. the cationic modifier is octadecyl trimethyl ammonium bromide.
The preparation method of the PBAT/PBS/PCL reactive blending material comprises the following steps: mixing PBAT, PBS, PCL, drying in a vacuum drying oven, adding glycidyl methacrylate and dicumyl peroxide, stirring uniformly, and extruding in a double-screw extruder to obtain the PBAT/PBS/PCL reactive blend material. Wherein, the mass ratio of PBAT, PBS, PCL, compatilizer and initiator is as follows: 30:30:30:2:5.
the preparation of the easily degradable coated yarn is carried out according to the conditions corresponding to the components, and specifically comprises the following steps:
s1, extruding a cortex material into a die in a molten state through an extruder;
s2, obtaining a blending core wire by a core layer material through a spinning process, arranging the blending core wire on a creel, providing 20cN tension for the blending core wire through a filtering tensiometer, inputting the blending core wire into a photoelectric device, and treating the blending core wire for 0.25S at 170 ℃ by utilizing corona and plasma generated by the photoelectric device to obtain a surface activated blending core wire;
and S3, drawing the surface-activated blending core wire obtained in the step S2 into a die, coating the blending core wire by using the molten cortex material in the step S1 to obtain a sheath-core composite fiber, and finally cooling, dewatering and demisting the sheath-core composite fiber, and winding to obtain the degradable coating wire.
Example 2
An easily degradable coated yarn comprising a core layer and a skin layer:
the core layer material is PLA/modified mica powder composite material;
the cortex material is a PBAT/PBS/PCL reactive blend material.
In this embodiment:
the preparation method of the PLA/modified mica powder composite material comprises the following steps: and (3) melting and blending the dried PLA and the modified mica powder in a double-screw extruder to prepare the PLA/modified mica powder composite material, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 20r/min. Wherein, the mass ratio of PLA to modified mica powder is 100:6.
the modified mica powder is cationic modified mica powder, and the preparation method of the cationic modified mica powder comprises the following steps: mixing mica powder, deionized water and a cationic modifier in a three-neck flask, stirring for 1.5h in a water bath at 75 ℃, cooling, standing, filtering, cleaning, drying and grinding to obtain the cationic modified mica powder. Wherein, the mass ratio of the mica powder to deionized water to the cationic modifier is 100:500:3. the cationic modifier is octadecyl trimethyl ammonium bromide.
The preparation method of the PBAT/PBS/PCL reactive blending material comprises the following steps: mixing PBAT, PBS, PCL, drying in a vacuum drying oven, adding glycidyl methacrylate and dicumyl peroxide, stirring uniformly, and extruding in a double-screw extruder to obtain the PBAT/PBS/PCL reactive blend material. Wherein, the mass ratio of PBAT, PBS, PCL, compatilizer and initiator is as follows: 35:30:30:2:5.
the preparation of the easily degradable coated yarn is carried out according to the conditions corresponding to the components, and specifically comprises the following steps:
s1, extruding a cortex material into a die in a molten state through an extruder;
s2, obtaining a blending core wire by a core layer material through a spinning process, arranging the blending core wire on a creel, providing 20cN tension for the blending core wire through a filtering tensiometer, inputting the blending core wire into a photoelectric device, and treating the blending core wire for 0.25S at 170 ℃ by utilizing corona and plasma generated by the photoelectric device to obtain a surface activated blending core wire;
and S3, drawing the surface-activated blending core wire obtained in the step S2 into a die, coating the blending core wire by using the molten cortex material in the step S1 to obtain a sheath-core composite fiber, and finally cooling, dewatering and demisting the sheath-core composite fiber, and winding to obtain the degradable coating wire.
Example 3
An easily degradable coated yarn comprising a core layer and a skin layer:
the core layer material is PLA/modified mica powder composite material;
the cortex material is a PBAT/PBS/PCL reactive blend material.
In this embodiment:
the preparation method of the PLA/modified mica powder composite material comprises the following steps: and (3) melting and blending the dried PLA and the modified mica powder in a double-screw extruder to prepare the PLA/modified mica powder composite material, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 20r/min. Wherein, the mass ratio of PLA to modified mica powder is 100:7.
the modified mica powder is cationic modified mica powder, and the preparation method of the cationic modified mica powder comprises the following steps: mixing mica powder, deionized water and a cationic modifier in a three-neck flask, stirring for 1.5h in a water bath at 75 ℃, cooling, standing, filtering, cleaning, drying and grinding to obtain the cationic modified mica powder. Wherein, the mass ratio of the mica powder to deionized water to the cationic modifier is 100:500:4. the cationic modifier is octadecyl trimethyl ammonium bromide.
The preparation method of the PBAT/PBS/PCL reactive blending material comprises the following steps: mixing PBAT, PBS, PCL, drying in a vacuum drying oven, adding glycidyl methacrylate and dicumyl peroxide, stirring uniformly, and extruding in a double-screw extruder to obtain the PBAT/PBS/PCL reactive blend material. Wherein, the mass ratio of PBAT, PBS, PCL, compatilizer and initiator is as follows: 37:30:30:3:5.
the preparation of the easily degradable coated yarn is carried out according to the conditions corresponding to the components, and specifically comprises the following steps:
s1, extruding a cortex material into a die in a molten state through an extruder;
s2, obtaining a blending core wire by a core layer material through a spinning process, arranging the blending core wire on a creel, providing 20cN tension for the blending core wire through a filtering tensiometer, inputting the blending core wire into a photoelectric device, and treating the blending core wire for 0.25S at 170 ℃ by utilizing corona and plasma generated by the photoelectric device to obtain a surface activated blending core wire;
and S3, drawing the surface-activated blending core wire obtained in the step S2 into a die, coating the blending core wire by using the molten cortex material in the step S1 to obtain a sheath-core composite fiber, and finally cooling, dewatering and demisting the sheath-core composite fiber, and winding to obtain the degradable coating wire.
Example 4
An easily degradable coated yarn comprising a core layer and a skin layer:
the core layer material is PLA/modified mica powder composite material;
the cortex material is a PBAT/PBS/PCL reactive blend material.
In this embodiment:
the preparation method of the PLA/modified mica powder composite material comprises the following steps: and (3) melting and blending the dried PLA and the modified mica powder in a double-screw extruder to prepare the PLA/modified mica powder composite material, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 20r/min. Wherein, the mass ratio of PLA to modified mica powder is 100:7.
the modified mica powder is cationic modified mica powder, and the preparation method of the cationic modified mica powder comprises the following steps: mixing mica powder, deionized water and a cationic modifier in a three-neck flask, stirring for 1.5h in a water bath at 75 ℃, cooling, standing, filtering, cleaning, drying and grinding to obtain the cationic modified mica powder. Wherein, the mass ratio of the mica powder to deionized water to the cationic modifier is 100:500:5. the cationic modifier is octadecyl trimethyl ammonium bromide.
The preparation method of the PBAT/PBS/PCL reactive blending material comprises the following steps: mixing PBAT, PBS, PCL, drying in a vacuum drying oven, adding glycidyl methacrylate and dicumyl peroxide, stirring uniformly, and extruding in a double-screw extruder to obtain the PBAT/PBS/PCL reactive blend material. Wherein, the mass ratio of PBAT, PBS, PCL, compatilizer and initiator is as follows: 40:30:30:3:5.
the preparation of the easily degradable coated yarn is carried out according to the conditions corresponding to the components, and specifically comprises the following steps:
s1, extruding a cortex material into a die in a molten state through an extruder;
s2, obtaining a blending core wire by a core layer material through a spinning process, arranging the blending core wire on a creel, providing 20cN tension for the blending core wire through a filtering tensiometer, inputting the blending core wire into a photoelectric device, and treating the blending core wire for 0.25S at 170 ℃ by utilizing corona and plasma generated by the photoelectric device to obtain a surface activated blending core wire;
and S3, drawing the surface-activated blending core wire obtained in the step S2 into a die, coating the blending core wire by using the molten cortex material in the step S1 to obtain a sheath-core composite fiber, and finally cooling, dewatering and demisting the sheath-core composite fiber, and winding to obtain the degradable coating wire.
Comparative example 1
Based on example 1, a core layer was prepared using PLA instead of PLA/modified mica powder composite material, which was used as a condition of comparative example 1, and a coated yarn of comparative example 1 was prepared.
Comparative example 2
Based on example 1, a cortex was prepared using PBAT instead of PBAT/PBS/PCL reactive blend material, which was used as the condition of comparative example 2, and a coated wire of comparative example 2 was prepared.
Test example 1
The coated filaments obtained in examples 1 to 4 and comparative examples 1 to 2 were tested for mechanical properties according to the method of GB/T14344-2008 "test method for tensile Property of chemical fiber filaments", and the test results are shown in Table 1 below.
TABLE 1 results of mechanical test of coated filaments obtained in examples 1-4 and comparative examples 1-2
From the test results in table 1, the breaking strength and the breaking elongation of the coated wires prepared in examples 1-4 are better than those of comparative examples 1-2, which shows that the preparation of the core layer by using the PLA/modified mica powder composite material and the preparation of the skin layer by using the PBAT/PBS/PCL reactive blending material can effectively improve the mechanical properties of the coated wires and facilitate the later processing of the coated wires.
Test example 2
And (3) ageing resistance test: the test pieces of the coated filaments prepared in examples 1 to 4 and comparative examples 1 to 2 were subjected to irradiation treatment with reference to the relative ultraviolet spectral irradiance (method a) of the solar ultraviolet region of the type 1A lamp in GB/T16422.3, and then the mechanical properties of the coated filaments were again tested according to the method in GB/T14344-2008 "chemical fiber filament tensile property test method", and the test results are shown in table 2.
TABLE 2 mechanical test results after aging of the coated filaments prepared in examples 1-4 and comparative examples 1-2
As can be seen from the results in Table 2, the mechanical properties of the coated filaments prepared in examples 1 to 4 after light aging are basically unchanged, which indicates that the coated filaments prepared in the examples of the invention have strong stability and excellent aging resistance. The coated yarn prepared in comparative example 1 has a small change in mechanical properties, while the coated yarn prepared in comparative example 2 has a large change in mechanical properties, which means that in this example, the ageing resistance of the coated yarn can be effectively improved by adding the modified mica powder to PLA.
Test example 3
The coated filaments prepared in examples 1 to 4 and comparative examples 1 to 2 were dyed using a commercially available red solvent dye to prepare a dye solution, and the dye-uptake was measured according to GB/T23976.1-2009 "dye-uptake assay". The test results are shown in table 3 below.
TABLE 3 results of the coated yarn color index tests made in examples 1-4 and comparative examples 1-2
As can be seen from the results in Table 3, the coated filaments prepared in examples 1-4 have a better coloring rate than the coated filaments prepared in comparative examples 1-2, which indicates that the coated filaments prepared in the examples of the invention are environment-friendly and easy to degrade, and have excellent mechanical properties, good heat resistance and better coloring rate.
The above description may be implemented alone or in various combinations and these modifications are within the scope of the present invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific examples described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (3)
1. The utility model provides an easily degradable coated yarn, includes sandwich layer and cortex, its characterized in that:
the core layer material is PLA composite material;
the cortex material is a PBAT/PBS/PCL reactive blend material;
the preparation method of the PBAT/PBS/PCL reactive blending material comprises the following steps: mixing PBAT, PBS, PCL, drying in a vacuum drying oven, adding a compatilizer and an initiator, uniformly stirring, and extruding in a double-screw extruder to obtain a PBAT/PBS/PCL reactive blend material;
the compatilizer is glycidyl methacrylate, and the initiator is dicumyl peroxide;
the mass ratio of PBAT, PBS, PCL, compatilizer and initiator is as follows: (30-40): 30:30: (2-3): 5, a step of;
the PLA composite material is a PLA/modified mica powder composite material, and the preparation method of the PLA/modified mica powder composite material comprises the following steps: melting and blending the dried PLA and modified mica powder in a double-screw extruder to prepare a PLA/modified mica powder composite material;
the mass ratio of the PLA to the modified mica powder is 100: (5-7);
the modified mica powder is cationic modified mica powder, and the preparation method of the cationic modified mica powder comprises the following steps: mixing mica powder, deionized water and a cationic modifier in a three-neck flask, stirring for 1.5h in a water bath at 75 ℃, cooling, standing, filtering, cleaning, drying and grinding to obtain cationic modified mica powder;
the mass ratio of the mica powder to deionized water to the cationic modifier is 100:500: (2-5);
the cationic modifier is octadecyl trimethyl ammonium bromide.
2. The degradable coated yarn of claim 1, wherein the temperature of each section of the screw is 160-190 ℃, the temperature of the machine head is 190 ℃ and the rotational speed of the screw is 20r/min.
3. A method of preparing an easily degradable coated yarn according to any one of claims 1-2, comprising the steps of:
s1, extruding a cortex material into a die in a molten state through an extruder;
s2, obtaining a blending core wire by a core layer material through a spinning process, arranging the blending core wire on a creel, providing 20cN tension for the blending core wire through a filtering tensiometer, inputting the blending core wire into a photoelectric device, and treating the blending core wire for 0.25S at 170 ℃ by utilizing corona and plasma generated by the photoelectric device to obtain a surface activated blending core wire;
and S3, drawing the surface-activated blending core wire obtained in the step S2 into a die, coating the blending core wire by using the molten cortex material in the step S1 to obtain a sheath-core composite fiber, and finally cooling, dewatering and demisting the sheath-core composite fiber, and winding to obtain the degradable coating wire.
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