CN110670348B - A kind of method of permeating polymerization softening hemp textile fiber - Google Patents

Abstract

The invention relates to the technical field of fiber post-treatment, in particular to a method for increasing flexibility of hemp textile fibers by osmotic polymerization, which is characterized in that surface defects are formed by rolling degummed hemp fibers, and the crystallinity of the hemp fibers is reduced by utilizing a composite plasticizer, so that the toughness and the flexibility of the hemp fibers are increased; further adding the polyvinyl alcohol emulsion into butyl acrylate, and stably fixing the polyvinyl alcohol on the surface of the fiber through the permeation and polymerization of the butyl acrylate; butyl acrylate polymerizes on itself to form a polymer, further enhancing the flexibility of the hemp fiber. The method has the advantages of obvious improvement on the flexibility of the hemp fibers, small damage to the hemp fibers, and simple and easily-controlled treatment method.

Description

A kind of method of permeating polymerization softening hemp textile fiber

technical field

The invention relates to the technical field of fiber post-processing, in particular to a method for softening hemp textile fibers by permeation polymerization.

Background technique

Hemp is one of the earliest cultivated and utilized fibers in the world. Chinese hemp has two types: early-maturing and late-maturing. The quality of the early-maturing fiber is good, such as thread hemp belongs to this category, and the late-maturing fiber is rough. Hemp is also known as thread hemp, cloud hemp, hemp, hemp, etc. It is the toughest fiber on the earth. It only needs a small amount of water and fertilizer in its growth, without any pesticides, and can be decomposed naturally, so hemp fiber is Environmentally friendly textile materials. Hemp has excellent moisture absorption and perspiration properties, natural antibacterial health care properties, good softness and comfort properties, excellent UV resistance, excellent high temperature resistance, unique wave absorption properties and natural rough style, known as "" It is widely used in clothing, home textiles, hats, shoe materials, socks, etc. Hemp textiles are especially suitable for sun protection clothing and various work clothes with special needs, as well as sun umbrellas, camping tents, fishing nets, ropes, lining materials, etc. In addition to being used in clothing, hemp textiles can also be used in interior decoration to reduce noise.

Hemp has excellent properties such as hygiene, anti-mildew, anti-bacterial, anti-corrosion, anti-static, UV absorption, fast moisture absorption and dehumidification, good drapability, flame retardant, and comfortable, and it does not have a strong itch like general hemp fabrics. Therefore, in the field of textiles in recent years, hemp fiber has gradually been favored by users as a textile raw material for clothing fabrics. Compared with cotton fabrics, wearing hemp clothing can make the body feel about 5°C lower in temperature. Therefore, hemp fabric has excellent moisture absorption and breathability, and hemp fiber is very suitable as a raw material for clothing. Commonly used in clothing, bedding, etc.

However, hemp fiber products have poor fiber length uniformity, high stiffness, brittleness and easy breakage, and poor cohesion. During the spinning process, fiber disintegration and breakage are prone to occur, resulting in sticky rolls and holes during the rolling process. The phenomenon of web formation, sliver breaking during sliver formation, and yarn breakage, etc. On the one hand, the poor flexibility of hemp fiber makes textile processing more difficult. On the other hand, the fiber structure and microcrystalline structure of hemp fiber are different from those of cotton, ramie and flax. The grey cloth has a rough surface and feels stiff. Because hemp has the characteristics of short fiber, large difference between batches, and great influence of humidity on strength, the following points should be paid attention to in the spinning process: pay attention to the change of raw materials. In order to ensure and improve the strength index of yarn, raw cotton is the most It is best to use long-staple cotton or high-quality fine-staple cotton 129, and the cotton inspection department will test the hemp batch by batch, and adjust the spinning process according to the test fiber indicators. The other processes are the same. After using long-staple cotton, the strength is significantly increased, and the evenness is improved at the same time. The hemp is pretreated, especially the relative humidity is increased to ensure that it is in a state of dehumidification during the spinning process. Local humidification is carried out on this production line to ensure that the hemp is in a high-strength state. Properly enhance the carding ability of the carding and combing process, and remove impurities more, the carding drop rate is 3%, and the combing drop rate is about 25%. Appropriately increase the twist of the roving to prevent the roving from being interrupted or coarse details in the spun yarn production process, resulting in poor evenness and thus affecting the strength. Appropriately adjust some process parameters to improve yarn evenness and hairiness, thereby improving yarn luster and strength.

To this end, hemp fibers need to be flexibly modified. For example, using bio-cottonization modified hemp to produce soft cottonized hemp fibers, which can be further separated into finer primary fiber bundles in subsequent mechanical processing. Used in knitted underwear, it does not feel sticky when sweating, but makes people feel cool and cool; cotton yarn modified hemp fiber is used in denim, adding hemp fiber can improve the quality of denim and make denim clothing more durable. Wide adaptability and functionality, hemp denim clothing is rough in style, comfortable in hand, crisp in shape, moisture-absorbing and breathable; hemp and various natural fibers and new fibers are blended to form silk and linen interwoven satin, with silk luster and feel on the front. The reverse side has the texture of hemp, successfully combining the advantages of silk and hemp textiles.

However, there are still problems in the current technology of softening and modification of hemp itself. In the prior art, mainly through the etching of NaOH solution, the crystal lattice of the cellulose crystal of the hemp fiber is reversed and changed under the action of alkali, and the crystallinity of the hemp fiber is weakened, so that the fiber itself becomes flexible. This technology causes great damage to the fibers, usually resulting in excessive linting of fibers, or even loss of fiber function.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the deficiencies of the prior art, provide a method for softening hemp textile fibers by permeation polymerization, and solve the problem of excessive damage to the fiber structure by directly treating the hemp fibers with alkali to soften in the prior art. The method for permeating and softening hemp textile fibers provided by the invention forms surface defects by rolling the degummed hemp fibers, and uses a composite plasticizer to reduce the crystallinity of the hemp fibers, thereby increasing the toughness and flexibility of the hemp fibers.

The purpose of this invention is to realize through the following technical solutions:

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1: Rolling the degummed hemp fiber with an overpressure roller, continuing to soak in the composite plasticizer, centrifuging, and drying to obtain the plasticized hemp fiber;

Step 2. Add the plasticized hemp fiber to the airflow mixer, spray silicone oil while stirring, let it stand (usually stand for 24 hours), continue to stir and spray the infiltrating slurry while stirring, stand (usually stand for 24 hours) Set 24h) to obtain infiltrated hemp fibers;

Step 3: adding the permeable hemp fiber to the reactor, heating the temperature to 60-100° C. for 1-2 hours, centrifuging and drying to obtain the softened hemp textile fiber.

In order to increase the flexibility of hemp fibers, surface defects are formed by rolling degummed hemp fibers, and composite plasticizers are used to reduce the crystallinity of hemp fibers, thereby increasing the toughness and flexibility of hemp fibers; further, polyvinyl alcohol emulsion is added to butyl acrylate In the process, the polyvinyl alcohol is stably fixed on the fiber surface through the penetration and polymerization of butyl acrylate, and the butyl acrylate itself polymerizes to form a polymer, which further enhances the flexibility of the hemp fiber. The method obviously improves the flexibility of the hemp fiber, and has little damage to the hemp fiber, and the processing method is simple and easy to control.

Rolling the degummed hemp fiber over a pressure roller makes the surface of the hemp fiber deteriorate, forming surface defects by rolling the degummed hemp fiber, and using a composite plasticizer to reduce the crystallinity of the hemp fiber, thereby increasing the toughness and flexibility of the hemp fiber. The composite plasticizer has mild plasticizing effect on the hemp fiber, which is easy to penetrate and reduce the crystallinity, which helps to increase the flexibility of the hemp fiber, and at the same time makes the hemp fiber more easily penetrate the subsequent modifier.

Through airflow agitation, it is easy to disperse the fibers so that the silicone oil can fully contact the fiber surface; by spraying the silicone oil, on the one hand, the fibers are penetrated, and on the other hand, the polymerization and fusion of butyl acrylate on the fiber surface are facilitated.

Further, in the step 1, the temperature of the pressing roller is 40-60° C., and the speed of the pressing roller is 5-10 m/min;

In the step 1, the soaking temperature is 40-80°C, and the soaking time is 1-2h;

In the step 1, the drying temperature is 80-140° C., and the drying time is 30-60 min;

In the step 1, the composite plasticizer includes the following components in parts by weight: 2-4 parts of glycerol, 1-3 parts of dimethyl sulfoxide, and 0.5-1.5 parts of dimethylol butyric acid.

Rolling the degummed hemp fiber over a pressure roller makes the surface of the hemp fiber deteriorate. By rolling the degummed hemp fiber to form specific surface defects, the composite plasticizer is used to reduce the crystallinity of the hemp fiber, thereby increasing the toughness and flexibility of the hemp fiber. The temperature and speed of the pressing roll are controlled in the process of pressing the roll, so that the specific surface defect can be better formed by rolling the degummed hemp fiber.

The compound plasticizer is a compound of glycerol, dimethyl sulfoxide and dimethylol butyric acid, which has mild plasticizing effect on hemp fibers, is easy to penetrate, reduces crystallinity, helps increase the flexibility of hemp fibers, and at the same time makes hemp fibers more permeable Subsequent modifiers.

Further preferably, in the step 1, the temperature of the pressing roller is 40-50° C., and the speed of the pressing roller is 5-8 m/min;

In the step 1, the soaking temperature is 50-60°C, and the soaking time is 1-2h;

In the step 1, the drying temperature is 100-120° C., and the drying time is 30-60 min;

In the step 1, the composite plasticizer includes the following components in parts by weight: 3 parts of glycerol, 2 parts of dimethyl sulfoxide, and 1 part of dimethylol butyric acid.

The preferred composite plasticizer is glycerol, dimethyl sulfoxide, and dimethylol butyric acid in a mass ratio of 3:2:1, which has mild plasticization to hemp fibers, is easy to penetrate, reduces crystallinity, and assists in increasing Hemp fibers are flexible, while making hemp fibers more permeable to subsequent modifiers.

Further, in the second step, the mass ratio of the silicone oil to the plasticized hemp fiber is (0.001～0.01): 1, and the ventilation volume per unit groove body section when the silicone oil is sprayed is 0.8～1.0m ³ ·min ^-1 ·m ^-2 ;

In the second step, the mass ratio of the infiltrating slurry to the plasticized hemp fiber is (0.01-0.1): 1, and the ventilation volume per unit groove section when the infiltrating slurry is sprayed is 0.4-0.6 m ³ ·min ^-1 ·m ^{- 2} .

Further preferably, in the second step, the mass ratio of the silicone oil to the plasticized hemp fiber is 0.002:1; in the second step, the mass ratio of the infiltrated slurry to the plasticized hemp fiber is (0.03-0.05):1. Through airflow stirring, it is easy to disperse the fibers so that the silicone oil can be fully contacted with the fiber surface. The amount of silicone oil sprayed is 0.2% of the fiber mass; by spraying the silicone oil, on the one hand, it penetrates the fibers, and on the other hand, it is conducive to the polymerization and fusion of butyl acrylate on the fiber surface. . Mix the polyvinyl alcohol emulsion, butyl acrylate and azodiisoheptyl evenly to form a permeable slurry, and then roll it in an airflow mixer to spray the permeable slurry, so that the permeable slurry can fully penetrate and coat the fiber surface, and the permeable slurry is sprayed The amount is 3 to 5% of the fiber mass.

In the process of spraying silicone oil, the ventilation volume of spraying silicone oil is larger, and the spraying speed of silicone oil is faster at this time, and the viscosity of silicone oil is lower, which is suitable for faster spraying. In the process of spraying the slurry, considering the viscosity of the slurry, it can be applied to slower spraying.

Further, the osmotic slurry includes the following components in parts by weight: 1-3 parts of polyvinyl alcohol emulsion, 5-10 parts of butyl acrylate, and 0.05-0.1 parts of azodiisoheptyl.

Mix the polyvinyl alcohol emulsion, butyl acrylate and azodiisoheptane evenly to form a permeable slurry, and then roll it in an airflow mixer to spray the permeable slurry to fully penetrate and coat the fiber surface. Through the penetration and polymerization of butyl acrylate, the polyvinyl alcohol is stably fixed on the surface of the fiber; the butyl acrylate itself polymerizes to form a polymer, which further enhances the flexibility of the hemp fiber.

Further preferably, the polyvinyl alcohol emulsion includes the following components in parts by weight: 5-15 parts of polyvinyl alcohol, 80-120 parts of water, and 0.4-0.6 parts of Span-20. The polyvinyl alcohol emulsion is prepared by high-speed dispersion of polyvinyl alcohol, water and Span-20.

Further preferably, the polyvinyl alcohol emulsion includes the following components by weight: 10 parts of polyvinyl alcohol, 100 parts of water, and 0.5 parts of Span-20.

Further, in the step 3, the temperature of the heating reaction is 80-90° C., and the reaction time is 1-2 h; in the step 3, the drying temperature is 100° C. and the drying time is 30-60 min.

The beneficial effects of the present invention are: forming surface defects by rolling the degummed hemp fibers, using a composite plasticizer to reduce the crystallinity of the hemp fibers, thereby increasing the toughness and flexibility of the hemp fibers; further adding the polyvinyl alcohol emulsion into the butyl acrylate , through the penetration and polymerization of butyl acrylate, the polyvinyl alcohol is stably fixed on the surface of the fiber; the butyl acrylate itself polymerizes to form a polymer, which further enhances the flexibility of the hemp fiber. The method obviously improves the flexibility of the hemp fiber, and has little damage to the hemp fiber, and the processing method is simple and easy to control.

Detailed ways

The present invention will be further described in detail below through specific embodiments, but it should not be understood that the scope of the present invention is limited to the following examples. Without departing from the above-mentioned method idea of the present invention, various substitutions or changes made according to common technical knowledge in the art and conventional means should all be included within the scope of the present invention.

Example 1

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1. Roll the degummed hemp fiber over-pressing roller at a temperature of 40°C, and the rolling speed is 5m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 40°C for 2 hours, Centrifuge and dry at 80°C for 60min to obtain plasticized hemp fibers;

Step 2, adding the plasticized hemp fiber to the airflow mixer, spraying silicone oil while stirring, the mass ratio of the silicone oil and the plasticized hemp fiber is 0.001:1, and the ventilation volume of the unit tank body section when spraying the silicone oil is 0.8m ³ ·min ^-1 ·m ^-2 , let stand for 24h, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of infiltrating slurry to plasticized hemp fiber is 0.01:1, and the ventilation of the unit tank section when spraying the infiltrating slurry The amount is 0.4m ³ ·min ^-1 ·m ^-2 , and it is allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3: adding the permeable hemp fiber into the reactor, heating up to 60°C for reaction for 2h, centrifuging, and drying at 100°C for 60min to obtain softened hemp textile fiber.

Specifically, in the step 1, the composite plasticizer includes the following components in parts by weight: 2 parts of glycerol, 1 part of dimethyl sulfoxide, and 0.5 part of dimethylol butyric acid;

The infiltrating slurry comprises the following components by weight: 1 part of polyvinyl alcohol emulsion, 5 parts of butyl acrylate, and 0.05 part of azobisisoheptyl;

The polyvinyl alcohol emulsion includes the following components in parts by weight: 5 parts of polyvinyl alcohol, 80 parts of water, and 0.4 parts of Span-20.

Example 2

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1. Roll the degummed hemp fiber overpressure roller at a temperature of 60°C, and the rolling speed is 10m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 80°C for 1 hour, Centrifuge and dry at 140°C for 30min to obtain plasticized hemp fibers;

Step 2, adding the plasticized hemp fiber to the airflow mixer, spraying silicone oil while stirring, the mass ratio of the silicone oil and the plasticized hemp fiber is 0.01:1, and the ventilation volume of the unit tank body section when spraying the silicone oil is 1.0m ³ ·min ^-1 ·m ^-2 , let stand for 24 hours, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of the infiltrating slurry to the plasticized hemp fiber is 0.1:1, the ventilation of the unit tank section when spraying the infiltrating slurry The amount is 0.6m ³ ·min ^-1 ·m ^-2 , and it is allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3, adding the permeable hemp fiber into the reactor, heating up to 100°C for 1 hour, centrifuging, and drying at 100°C for 30 minutes to obtain softened hemp textile fiber.

Specifically, in the step 1, the composite plasticizer includes the following components in parts by weight: 4 parts of glycerol, 3 parts of dimethyl sulfoxide, and 1.5 parts of dimethylol butyric acid;

The infiltrating slurry comprises the following components by weight: 3 parts of polyvinyl alcohol emulsion, 10 parts of butyl acrylate, and 0.1 part of azobisisoheptyl;

The polyvinyl alcohol emulsion includes the following components in parts by weight: 15 parts of polyvinyl alcohol, 120 parts of water, and 0.6 parts of Span-20.

Example 3

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1. Roll the degummed hemp fiber with an overpressure roller at a temperature of 45 °C, and the rolling speed is 7 m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 50 °C for 1.2h , centrifuged, and dried at a temperature of 100 °C for 40 min to obtain plasticized hemp fibers;

Step 2: Add the plasticized hemp fiber into the air flow mixer, spray silicone oil while stirring, the mass ratio of the silicone oil to the plasticized hemp fiber is 0.005:1, and the ventilation volume per unit tank section when spraying the silicone oil is 0.8～ ^1.0m3 ·min ^-1 ·m ^-2 , let stand for 24 hours, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of infiltrating slurry to plasticized hemp fiber is 0.05:1, and the unit tank section when spraying the infiltrating slurry The ventilation volume was 0.5m ³ ·min ^-1 ·m ^-2 , and it was allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3: adding the permeable hemp fiber to the reactor, heating up to 80°C for 1.5h, centrifuging, and drying at 100°C for 45min to obtain softened hemp textile fiber.

Specifically, in the step 1, the composite plasticizer includes the following components in parts by weight: 3 parts of glycerol, 2 parts of dimethyl sulfoxide, and 1.0 parts of dimethylol butyric acid;

The infiltrating slurry comprises the following components in parts by weight: 2, polyvinyl alcohol emulsion, 6, butyl acrylate, and 0.06 part of azobisisoheptyl;

The polyvinyl alcohol emulsion includes the following components in parts by weight: 8 parts of polyvinyl alcohol, 90 parts of water, and 0.5 parts of Span-20.

Example 4

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1. Roll the degummed hemp fiber with an overpressure roller at a temperature of 50 °C, and the rolling speed is 8 m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 60 °C for 1.8h , centrifuged, and dried at a temperature of 100 ° C for 50 min to obtain plasticized hemp fibers;

Step 2, adding the plasticized hemp fiber into the airflow mixer, spraying silicone oil while stirring, the mass ratio of the silicone oil and the plasticized hemp fiber is 0.002:1, and the ventilation volume of the unit tank body section when spraying the silicone oil is 0.9m ³ ·min ^-1 ·m ^-2 , let stand for 24 hours, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of infiltrating slurry to plasticized hemp fiber is 0.03:1, and the ventilation of the unit tank section when spraying the infiltrating slurry The amount is 0.5m ³ ·min ^-1 ·m ^-2 , and it is allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3: Add the permeable hemp fiber into the reactor, heat up to 80°C for 1.5h reaction, centrifuge, and dry at 100°C for 50min to obtain softened hemp textile fiber.

Specifically, in the step 1, the composite plasticizer includes the following components in parts by weight: 3 parts of glycerol, 2 parts of dimethyl sulfoxide, and 1 part of dimethylol butyric acid;

The infiltrating slurry comprises the following components by weight: 2 parts of polyvinyl alcohol emulsion, 8 parts of butyl acrylate, and 0.08 parts of azobisisoheptyl;

The polyvinyl alcohol emulsion includes the following components in parts by weight: 10 parts of polyvinyl alcohol, 100 parts of water, and 0.5 parts of Span-20.

Example 5

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1. Roll the degummed hemp fiber overpressure roller at a temperature of 45°C, and the rolling speed is 6m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 50°C for 1.5h , centrifuged, and dried at a temperature of 100 °C for 40 min to obtain plasticized hemp fibers;

Step 2, adding the plasticized hemp fiber to the airflow mixer, spraying silicone oil while stirring, the mass ratio of the silicone oil and the plasticized hemp fiber is 0.002:1, and the ventilation volume of the unit tank body section when spraying the silicone oil is 0.9m ³ ·min ^-1 ·m ^-2 , let stand for 24 hours, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of infiltrating slurry to plasticized hemp fiber is 0.05:1, and the ventilation of the unit tank section when spraying the infiltrating slurry The amount is 0.5m ³ ·min ^-1 ·m ^-2 , and it is allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3: adding the permeable hemp fiber to the reactor, heating up to 85°C for 1.5h, centrifuging, and drying at 100°C for 30min to obtain softened hemp textile fiber.

Specifically, in the step 1, the composite plasticizer includes the following components in parts by weight: 3 parts of glycerol, 3 parts of dimethyl sulfoxide, and 1.5 parts of dimethylol butyric acid;

The infiltrating slurry comprises the following components by weight: 3 parts of polyvinyl alcohol emulsion, 8 parts of butyl acrylate, and 0.08 parts of azobisisoheptyl;

The polyvinyl alcohol emulsion includes the following components in parts by weight: 8 parts of polyvinyl alcohol, 110 parts of water, and 0.5 parts of Span-20.

Example 6

A method for permeating and polymerizing softened hemp textile fibers, comprising the steps of:

Step 1. Roll the degummed hemp fiber overpressure roller at a temperature of 50°C, and the rolling speed is 8m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 50°C for 2 hours, Centrifuge and dry at 100°C for 40min to obtain plasticized hemp fibers;

Step 2, adding the plasticized hemp fiber to the airflow mixer, spraying silicone oil while stirring, the mass ratio of the silicone oil and the plasticized hemp fiber is 0.002:1, and the ventilation volume of the unit tank body section when spraying the silicone oil is 1.0m ³ ·min ^-1 ·m ^-2 , let stand for 24 hours, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of infiltrating slurry to plasticized hemp fiber is 0.05:1, and the ventilation of the unit tank section when spraying the infiltrating slurry The amount is 0.5m ³ ·min ^-1 ·m ^-2 , and it is allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3: Add the permeable hemp fiber into the reactor, heat up to 80°C for reaction for 2h, centrifuge, and dry at 100°C for 60min to obtain softened hemp textile fiber.

Specifically, in the step 1, the composite plasticizer includes the following components in parts by weight: 2 parts of glycerol, 3 parts of dimethyl sulfoxide, and 1 part of dimethylol butyric acid;

The infiltrating slurry comprises the following components by weight: 1 part of polyvinyl alcohol emulsion, 5 parts of butyl acrylate, and 0.1 part of azobisisoheptyl;

The polyvinyl alcohol emulsion includes the following components in parts by weight: 10 parts of polyvinyl alcohol, 100 parts of water, and 0.5 parts of Span-20.

Comparative Example 1

The degummed hemp fiber overpressure roller was rolled at a temperature of 40 ° C, and the rolling speed was 5 m/min, so that the surface of the hemp fiber was degraded, and continued to be soaked in a composite plasticizer at a temperature of 40 ° C for 2 hours, centrifuged, The temperature is 80 ℃ and drying for 60 minutes to obtain plasticized hemp fibers;

The composite plasticizer includes the following components in parts by weight: 2 parts of glycerol, 1 part of dimethyl sulfoxide, and 0.5 part of dimethylol butyric acid.

Comparative Example 1 was directly plasticized without subsequent softening treatment of butyl acrylate polymerization.

Comparative Example 2

Step 1. Roll the degummed hemp fiber over-pressing roller at a temperature of 40°C, and the rolling speed is 5m/min, so that the surface of the hemp fiber is deteriorated, and continue to soak in a composite plasticizer with a temperature of 40°C for 2 hours, Centrifuge and dry at 80°C for 60min to obtain plasticized hemp fibers;

Step 2, adding the plasticized hemp fiber to the airflow mixer, spraying silicone oil while stirring, the mass ratio of the silicone oil and the plasticized hemp fiber is 0.001:1, and the ventilation volume of the unit tank body section when spraying the silicone oil is 0.8m ³ ·min ^-1 ·m ^-2 , let stand for 24 hours, continue to stir and spray the infiltrating slurry while stirring, the mass ratio of the infiltrating slurry to the plasticized hemp fiber is 0.01:1, the ventilation of the unit tank section when spraying the infiltrating slurry The amount is 0.4m ³ ·min ^-1 ·m ^-2 , and it is allowed to stand for 24h to obtain infiltrated hemp fibers;

Step 3: adding the permeable hemp fiber into the reactor, heating up to 60°C for reaction for 2h, centrifuging, and drying at 100°C for 60min to obtain softened hemp textile fiber.

In the step 1, the composite plasticizer includes the following components by weight: 2 parts of glycerol, 1 part of dimethyl sulfoxide, and 0.5 part of dimethylol butyric acid;

The infiltrating slurry comprises the following components in parts by weight: 5 parts of butyl acrylate, 0.05 part of azodiisoheptyl;

In Comparative Example 2, no polyvinyl alcohol emulsion was added to the slurry.

Comparative Example 3

The degummed hemp fiber is rolled with an overpressure roller at a temperature of 45° C. and the rolling speed is 6 m/min, so that the surface of the hemp fiber is deteriorated, and the pretreated hemp fiber is obtained.

In Comparative Example 3, only the rolling treatment was performed, and the subsequent infiltration polymerization was not softened, which was used as a blank control sample.

For qualitative performance comparison, the same batch of degummed hemp fibers, the hemp fibers treated in Examples 1 to 6 and Comparative Examples 1 to 3 were used for the following tests. Through the following performance test, the results of the performance test are shown in Table 1, and the blank control in Table 1 is untreated hemp fiber.

1. Modulus test: test on an electronic single fiber strength tester. The smaller the modulus, the softer the fiber. As in Table 1.

2. Micronaire value: refer to the airflow meter method of the fineness test method in GB/T18147.4 "Hemp Fiber Test Method", the definition of micronaire value: the measurement of the air permeability of a certain amount of cotton fibers under specified conditions Clone value representation. If the fiber is fine and soft, the micronaire value will be small; on the contrary, if the fiber is thick and hard, the micronaire value will be large. Micronaire value test three sets of data. As in Table 1.

Table 1

It can be seen from the data in Table 1 that the modulus of Examples 1 to 6 is small, so it can be seen that the fibers of Examples 1 to 6 are relatively soft, and the fibers of Examples 3 to 6 are relatively soft. softer. The micronaire values of Examples 1 to 6 are small, so it can be seen that the fibers of Examples 1 to 6 are relatively soft, and the fibers of Examples 3 to 6 are relatively softer. The micronaire values of Examples 1 to 6 have small deviations. The fibers of Comparative Example 1 were untreated and were the stiffest.

Claims (5)

1. A method of osmotically polymerizing a stiffened hemp textile fiber comprising the steps of:

step one, rolling the degummed hemp fiber by a compression roller, continuously soaking in a composite plasticizer, centrifuging, and drying to obtain plasticized hemp fiber; the composite plasticizer comprises the following components in parts by weight: 2-4 parts of glycerol, 1-3 parts of dimethyl sulfoxide and 0.5-1.5 parts of dimethylolbutyric acid;

step two, adding the plasticized hemp fibers into an airflow stirrer, spraying silicone oil while stirring, standing, continuously stirring, spraying the penetrating slurry while stirring, and standing to obtain the penetrating hemp fibers; the penetrating slurry comprises the following components in parts by weight: 1-3 parts of polyvinyl alcohol emulsion, 5-10 parts of butyl acrylate and 0.05-0.1 part of azodiisoheptanonitrile; the mass ratio of the silicone oil to the plasticized hemp fibers is (0.001-0.01): 1, the ventilation volume of the cross section of the unit groove body is 0.8-1.0 m when silicone oil is sprayed³·min^-1·m^-2(ii) a The mass ratio of the penetrating slurry to the plasticized hemp fibers is (0.01-0.1): 1, the ventilation of the unit groove body section is 0.4-0.6 m when the penetrating slurry is sprayed³·min^-1·m^-2；

And step three, adding the permeable hemp fibers into a reactor, heating to 60-100 ℃, reacting for 1-2 hours, centrifuging, and drying to obtain the flexibility-enhanced hemp textile fibers.

2. A method of osmotically polymerizing a stiffened flexible hemp textile fiber according to claim 1, wherein:

the temperature of the press roll in the first step is 40-60 ℃, and the speed of the press roll is 5-10 m/min;

the soaking temperature in the first step is 40-80 ℃, and the soaking time is 1-2 h;

in the first step, the drying temperature is 80-140 ℃, and the drying time is 30-60 min.

3. A method of osmotically polymerizing a stiffened flexible hemp textile fiber according to claim 1 or 2, characterized in that:

the temperature of the press roll in the first step is 40-50 ℃, and the speed of the press roll is 5-8 m/min;

the soaking temperature in the first step is 50-60 ℃, and the soaking time is 1-2 h;

in the first step, the drying temperature is 100-120 ℃, and the drying time is 30-60 min.

4. A method of osmotically polymerizing a densified flexible hemp textile fiber according to claim 1, wherein the polyvinyl alcohol emulsion comprises the following components in parts by weight: 5-15 parts of polyvinyl alcohol, 80-120 parts of water and 0.4-0.6 part of span-20.

5. The method for osmotically polymerizing the increased flexibility hemp textile fiber according to claim 1, wherein the temperature of the temperature rise reaction in the third step is 80-90 ℃ and the reaction time is 1-2 h; and in the third step, the drying temperature is 100 ℃, and the drying time is 30-60 min.