Fibroin modification method for synthetic fibers

Abstract

The invention discloses a method for modifying fibroin of synthetic fibers, which comprises pretreatment and silk making, silk protein peptide powder is directly melted and blended into polymer master batch and an auxiliary functional aid, and silk making is performed by sequentially utilizing spinning, cooling and drafting, so that the synthetic fibers (such as polyester or chinlon) are provided with silk protein peptide, and the silk protein peptide powder is added into the polymer master batch and the auxiliary functional aid. The silk protein peptide has the advantages of the silk protein peptide, and the silk protein peptide is not easy to dissolve and lose.

Description

Technical Field

[0001] The present invention relates to the technical field of synthetic fibers, in particular to the technical field of synthetic fiber modification. Background Art

[0002] Synthetic fibers are fiber-forming polymers (such as polyester and nylon) that are made by spinning and post-processing artificially synthesized linear polymers with suitable molecular weight and solubility (or fusibility). Taking polyester as an example, it is widely used in clothing and household textiles such as coats, curtains, sofa fabrics and car interiors due to its high breaking strength, good light resistance, strong resilience, easy dyeing, water resistance, friction resistance and low manufacturing cost. However, polyester itself has poor hygroscopicity (polyester is a super hydrophobic fiber) and air permeability, resulting in poor wearing comfort of clothing made of polyester fabrics. In addition, when polyester rubs against each other or against other substances, it is also easy to generate static electricity due to its low water content (on the one hand, this may cause textile processing problems such as fiber entanglement with machine parts, yarn hairiness and inability to bundle, and unclear warp opening during weaving. On the other hand, it is also easy to stick to the human body surface and cause a sense of adhesion).

[0003] Silk protein is a natural high-molecular fiber protein extracted from silk, accounting for about 70-80% of silk and containing 18 kinds of amino acids (glycine, alanine and serine account for more than 80% of the total composition). Silk protein not only has good hygroscopicity, but also has good affinity to the human body because its structure is similar to human skin keratin.

[0004] In order to make the fabric have the characteristics of high strength and high resilience of polyester while taking into account hygroscopicity, people choose to weave polyester and silk together (such as an antistatic polyester composite fabric with publication number CN105768300A) or modify polyester with silk protein (such as a thin and skin-friendly fabric with publication number CN117449099B); among them, the former cannot fundamentally improve the poor hygroscopicity of polyester itself, while the latter often has the problems of low silk protein loading and easy dissolution of silk protein in hot water. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide a method for modifying silk protein in synthetic fibers, which can improve the moisture absorption and perspiration discharge of synthetic fiber fabrics while maintaining the silk-like feel and avoid the dissolution loss of silk protein.

[0006] To achieve the above object, the present invention provides a method for modifying silk fibroin of synthetic fibers, comprising the following steps: a) Pretreatment: firstly, the silk is heated in a weak alkaline solution to be degummed, and then, after being rinsed and dissolved by heating in a neutral salt solution, enzymatic hydrolysis is performed using a protease, and then the enzyme-inactivated enzymatic hydrolyzate is nanofiltered and dried in sequence to obtain silk protein peptide powder; b) Silk making: firstly, silk protein peptide powder, polymer masterbatch and auxiliary functional additives are melt-blended, and then spinning, cooling and drawing are carried out in sequence to obtain internally modified synthetic fibers.

[0007] Preferably, in step a), the weak alkali solution is a sodium carbonate solution with a mass concentration of 0.5-1.5%, the degumming conditions include a degumming temperature of 75-85°C and a degumming time of 15-25 min, the neutral salt solution is a potassium chloride solution, a magnesium chloride solution or a calcium chloride solution, or a combination thereof, and the mass concentration is controlled at 20-50%, the protease is papain and / or a neutral protease, and the addition amount is 1-2% of the total weight, the enzymatic hydrolysis conditions include a pH of 7.5-8.5, an enzymatic hydrolysis temperature of 35-45°C and an enzymatic hydrolysis time of 5-10 h, and after the enzymatic hydrolysis is completed, the enzyme is inactivated by first heating the temperature to 70-80°C and then keeping the temperature for 20-30 min, and after the enzyme inactivation is completed, a nanofiltration membrane is used to screen out small molecule silk fibroin of 1000-5000 Da.

[0008] Preferably, in step b), the amount of the silk protein peptide powder added is 20-40% of the total mass, the amount of the auxiliary functional additive added is 1-20% of the total mass, the auxiliary functional additive is one or a combination of colorants, fiber lubricants, fiber antioxidants, dispersants and gloss regulators, the fiber lubricant is a stearate lubricant, the polymer masterbatch is a polyethylene terephthalate masterbatch or a polyamide masterbatch, the fiber antioxidant is a hindered phenol antioxidant, the dispersant is PE wax or PP wax, the gloss regulator is silicone oil or titanium dioxide, and the side blowing or ring blowing method is adopted. The fiber is cooled in a cooling manner and the wind temperature is controlled at 20-30°C. During the stretching period, the stretching speed ratio of the first group of stretching rollers and the second group of stretching rollers is controlled at 1.5-2.5:1, and the stretching temperature of the first group of stretching rollers is 50-90°C and the stretching temperature of the second group of stretching rollers is 100-120°C. The colorant is used for fiber coloring; the fiber lubricant is used to reduce the friction between the fibers (making the fibers smoother and more slick); the fiber antioxidant is used to reduce the deterioration of the filaments caused by oxidation reactions; the dispersant is used to improve the dispersibility of each raw material; and the gloss regulator is used to make the fiber glossy or matte.

[0009] As an advantage, the method further comprises the following steps: c) Alkali weight reduction treatment: first immerse the internally modified synthetic fiber or the synthetic fiber fabric woven from the internally modified synthetic fiber in an alkali weight reduction treatment agent containing 0.5-1.5% NaOH, 5-15% cross-linking agent and 0.5-1.5% surfactant, then react at a temperature of 60-80° C. while stirring for 0.5-1.5 hours, and then wash to neutrality to obtain a primary blank; d) Antistatic treatment: firstly, the primary blank is subjected to a padding treatment by using a padding machine and during the immersion period, the primary blank is immersed in an antistatic treatment agent containing 10-20% chitosan, 15-20% catalyst and 2-5% cross-linking agent, and then reacted for 10-20 minutes while stirring at a temperature of 40-60° C. to obtain a secondary blank; e) Silk protein loading: firstly, the secondary blank is subjected to a padding treatment by using a padding machine and during the immersion period, the secondary blank is immersed in a silk protein treatment agent containing a 5-10% silk fibroin solution and 0.5-1% cross-linking agent, and then reacted at a temperature of 60-80° C. while stirring for 30-60 minutes to obtain a tertiary blank; f) Post-treatment: first steam the tertiary blank with water vapor at 110-120° C. for 5-15 minutes, and then bake the tertiary blank with a setting machine at a temperature of 120-150° C. for 1-2 minutes to obtain a product.

[0010] Preferably, in step c), the cross-linking agent is ethylenediamine, and the surfactant is a cationic surfactant; in step d), the catalyst is sodium acetate, and the cross-linking agent is malonic acid; in step e), the molecular weight of the silk fibroin solution is controlled at 20,000 to 50,000 Daltons, and the cross-linking agent is an EH cross-linking agent.

[0011] Preferably, the impregnation and rolling machine includes an impregnation mechanism, a liquid squeezing mechanism, a defoaming mechanism and a controller. The impregnation mechanism has a cavity for accommodating liquid medicine. The liquid squeezing mechanism can squeeze the fabric impregnated with liquid medicine and make the squeezed liquid medicine flow back into the cavity. The liquid squeezing mechanism can cyclically suck out the liquid medicine from the cavity and return it to the cavity after vacuum defoaming. The controller is electrically connected to the liquid squeezing mechanism and the defoaming mechanism, respectively.

[0012] Preferably, the impregnation mechanism includes a cylinder body, a pressure roller and a guide roller. The cavity is located in the cylinder body and has an opening facing upward. Several pressure rollers are rotatably connected to the cylinder body in the cavity and liquid pressure gaps are formed between each other in turn. Several guide rollers are installed at the opening of the cylinder body, which can respectively guide the fabric into and out of the cavity.

[0013] Preferably, the squeezing mechanism includes a passive roller, an active roller, a roller frame and a squeezing motor, wherein the passive roller and the active roller are respectively rotatably connected to the roller frame and a liquid drainage gap is formed at adjacent surfaces, and the roller frame is fixed on the cylinder body and is equipped with a squeezing motor that can drive the active roller to rotate.

[0014] Preferably, the defoaming mechanism includes a casing, a vacuum suction device, a conduit, a solenoid valve and a liquid pump. A circulation pipeline is formed between the casing and the cylinder body through two conduits, and solenoid valves and liquid pumps are installed on the liquid inlet pipeline and the liquid outlet pipeline. The casing can use the vacuum suction device to keep the shell cavity in a vacuum state.

[0015] Preferably, the defoaming mechanism also includes a centrifugal bucket and a centrifugal motor. The centrifugal bucket is located in the shell cavity and is driven to rotate by the centrifugal motor. The centrifugal bucket is arranged with the barrel mouth facing upward and the barrel mouth is directly opposite to the liquid outlet of the liquid inlet pipeline. The bottom of the centrifugal bucket has an extension tube extending out of the casing and rotatably connected to the conduit located on the liquid outlet pipeline. The barrel mouth is also provided with an inner flange.

[0016] Beneficial effects of the present invention: 1) By directly melt-blending silk protein peptide powder into polymer masterbatch and auxiliary functional additives and then spinning, cooling and drawing in sequence to make silk, synthetic fibers (such as polyester or nylon) can be made to have silk protein peptides themselves, which not only has the advantages of silk protein peptides, but also is not easy to dissolve silk protein peptides; 2) By subjecting synthetic fiber fabrics to alkali reduction treatment, on the one hand, the fiber surface can be corroded into an uneven shape (the fiber surface appears rougher due to the presence of cracks and grooves), while making the fibers thinner and softer, making the interlacing points easier to loosen, thereby eliminating the original stiff feel of the synthetic fiber fabrics themselves (the feel will become softer and more elastic), and on the other hand, active groups such as amino, carboxyl and hydroxyl groups can be introduced onto the fibers, ultimately increasing the loading capacity of silk protein by increasing the specific surface area of ​​the fibers (increasing the loading position of silk protein) and enhancing the chemical cross-linking and physical adsorption capacity between the fibers and silk protein; 3) By padding the synthetic fiber fabrics that have been treated with alkali reduction with antistatic treatment agents, chitosan can not only be used to suppress the static charge voltage of the fiber itself, but also to increase the loading amount of silk protein and prevent the loss of loaded silk protein, and chitosan also has certain antibacterial properties; 4) By using low-temperature steaming followed by high-temperature baking to shape the product, the loading fastness of silk protein can be further enhanced and the elution rate of the product in hot water can be reduced; 5) The impregnation mechanism, the liquid squeezing mechanism, the defoaming mechanism and the controller are used together to form the impregnation rolling machine, and the casing, the vacuum suction device, the conduit, the solenoid valve and the liquid pump are used together to form the defoaming mechanism. The liquid squeezing mechanism can be used to suck out the liquid from the cavity and return it to the cavity after vacuum defoaming, thereby realizing the circulation defoaming of the liquid without affecting the continuous impregnation of the fabric.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a padding machine used in the method for modifying silk protein of synthetic fibers of the present invention; Figure 2 yes Figure 1 Front view when the debubble mechanism is removed; Figure 3 It is a front view of the defoaming mechanism of the padding machine used in the method for modifying the silk protein of the synthetic fiber of the present invention; Figure 4 It is a cross-sectional view of a centrifugal barrel of a padding machine used in the method for modifying silk protein of synthetic fibers of the present invention.

[0019] In the figure: 1-impregnation mechanism, 11-cylinder body, 12-pressing roller, 13-guide roller, 2-liquid squeezing mechanism, 21-passive roller, 22-active roller, 23-roller frame, 24-liquid squeezing motor, 3-foam removal mechanism, 31-casing, 32-vacuum aspirator, 33-centrifugal barrel, 331-extension tube, 332-inner flange, 34-centrifugal motor, 35-casing, 36-solenoid valve, 37-liquid pump. DETAILED DESCRIPTION

[0020] Embodiment 1: The method for modifying silk protein of synthetic fiber of the present invention comprises the following steps: a) Pretreatment: firstly, the silk is heated in a weak alkaline solution to be degummed, and then, after being rinsed and dissolved by heating in a neutral salt solution, enzymatic hydrolysis is performed using a protease, and then the enzyme-inactivated enzymatic hydrolyzate is nanofiltered and dried in sequence to obtain silk protein peptide powder; b) Silk making: firstly, silk protein peptide powder, polymer masterbatch and auxiliary functional additives are melt-blended, and then spinning, cooling and drawing are carried out in sequence to obtain internally modified synthetic fibers.

[0021] Wherein, in step a), the weak alkali solution is a sodium carbonate solution with a mass concentration of 1%, the degumming conditions include a degumming temperature of 80°C and a degumming time of 20 minutes, the neutral salt solution is a potassium chloride solution and the mass concentration is controlled at 30%, the protease is papain and the addition amount is 1.5% of the total weight, the enzymatic hydrolysis conditions include a pH of 8, an enzymatic hydrolysis temperature of 40°C and an enzymatic hydrolysis time of 8 hours, after the enzymatic hydrolysis is completed, the enzyme is inactivated by first heating to 75°C and then keeping warm for 25 minutes, and after the enzyme inactivation is completed, a nanofiltration membrane is used to screen out small molecule silk fibroin of 1000 to 5000Da.

[0022] In addition, in step b), the amount of the silk protein peptide powder added is 30% of the total mass, the amount of the auxiliary functional additive added is 10% of the total mass, the polymer masterbatch is polyethylene terephthalate masterbatch, the auxiliary functional additive is a gloss regulator, the gloss regulator is silicone oil, side blowing is used for cooling and the wind temperature is controlled at 25°C, and during the stretching period, the stretching speed ratio of the first group of stretching rollers and the second group of stretching rollers is controlled at 2:1, the stretching temperature of the first group of stretching rollers is 75°C, and the stretching temperature of the second group of stretching rollers is 110°C.

[0023] Embodiment 2: The method for modifying silk fibroin of synthetic fiber of the present invention, based on the first embodiment, further comprises the following steps: c) Alkali weight reduction treatment: first immerse the internally modified synthetic fiber or the synthetic fiber fabric woven from the internally modified synthetic fiber in an alkali weight reduction treatment agent containing 1% NaOH, 10% ethylenediamine and 1% cationic surfactant, then react at 70°C while stirring for 1 hour and then wash to neutrality to obtain a primary blank; d) Antistatic treatment: First, the primary blank is subjected to a padding treatment using a padding machine and during the immersion period, the primary blank is immersed in an antistatic treatment agent containing 15% chitosan, 18% sodium acetate and 3% malonic acid, and then reacted at a temperature of 50° C. for 15 minutes while stirring to obtain a secondary blank; e) Silk protein loading: First, the secondary blank is subjected to a padding treatment using a padding machine and during the immersion period, the secondary blank is immersed in a silk protein treatment agent containing a silk fibroin solution with a concentration of 8% (the molecular weight of the silk fibroin is controlled to be 20,000 to 50,000 Daltons) and 0.8% of an EH cross-linking agent, and then reacted at a temperature of 70° C. while stirring for 45 minutes to obtain a tertiary blank; f) Post-treatment: First, the tertiary blank is steamed with water vapor at 115° C. for 10 minutes, and then the tertiary blank is baked with a setting machine at a temperature of 120-150° C. for 1.5 minutes to obtain a product.

[0024] After testing, the product was found to have a dissolution retention rate of 92% after being immersed in 60°C hot water for 30 minutes.

[0025] In addition, see Figures 1 to 4 The impregnation and rolling machine includes an impregnation mechanism 1, a liquid squeezing mechanism 2, a defoaming mechanism 3 and a controller. The impregnation mechanism 1 has a cavity for accommodating liquid medicine. The liquid squeezing mechanism 2 can squeeze the fabric impregnated with liquid medicine and make the squeezed liquid medicine flow back into the cavity. The liquid squeezing mechanism 2 can cyclically suck out the liquid medicine from the cavity and return it to the cavity after vacuum defoaming. The controller is electrically connected to the liquid squeezing mechanism 2 and the defoaming mechanism 3 respectively.

[0026] The impregnation mechanism 1 includes a cylinder body 11, a pressure roller 12 and a guide roller 13. The cavity is located in the cylinder body 11 and has an opening facing upward. A plurality of pressure rollers 12 are rotatably connected to the cylinder body 11 in the cavity and a liquid pressure gap is formed between each of the rollers. A plurality of guide rollers 13 are installed at the opening of the cylinder body 11 and can guide the fabric into and out of the cavity.

[0027] The squeezing mechanism 2 includes a passive roller 21, an active roller 22, a roller frame 23 and a squeezing motor 24. The passive roller 21 and the active roller 22 are rotatably connected to the roller frame 23 and a liquid discharge gap is formed at adjacent surfaces. The roller frame 23 is fixed on the cylinder body 11 and is equipped with a squeezing motor 24 that can drive the active roller 22 to rotate.

[0028] The defoaming mechanism 3 includes a housing 31, a vacuum suction device 32, a conduit 35, a solenoid valve 36 and a liquid pump 37. A circulation pipeline is formed between the housing 31 and the cylinder body 11 through two conduits 35, and a solenoid valve 36 and a liquid pump 37 are installed on the liquid inlet pipeline and the liquid outlet pipeline. The housing 31 can use the vacuum suction device 32 to keep the shell cavity in a vacuum state.

[0029] The defoaming mechanism 3 also includes a centrifugal bucket 33 and a centrifugal motor 34. The centrifugal bucket 33 is located in the shell cavity and is driven to rotate by the centrifugal motor 34. The centrifugal bucket 33 is arranged with its bucket mouth facing upward and the bucket mouth is directly opposite to the liquid outlet of the liquid inlet pipeline. The bottom of the centrifugal bucket 33 has an extension tube 331 extending out of the casing 31 and rotatably connected to the conduit 35 located on the liquid outlet pipeline.

[0030] The barrel mouth is also provided with an inner flange 332.

[0031] The working process of the padding mill is as follows: First, the fabric is introduced into the cylinder body 11 through the guide roller 13, and then the fabric is guided out of the cylinder body 11 through the guide roller 13 after passing through each pressure roller 12 along each liquid pressing gap in turn; then, the fabric is passed along the liquid discharge gap between the passive roller 21 and the active roller 22; in the process of the active roller 22 driven by the liquid squeezing motor 24 to rotate, the fabric will first be fully immersed in the liquid medicine under the squeezing action of each pressure roller 12, and then the excess liquid medicine will be squeezed out under the relative squeezing action of the passive roller 21 and the active roller 22 (the liquid carrying rate is controlled at about 30%).

[0032] During this period, the defoaming mechanism 3 can be used to circulate and defoam the liquid medicine in the cylinder 11 (especially the antistatic treatment agent with a relatively viscous texture containing chitosan); specifically, the solenoid valve 36 located on the liquid inlet pipeline is opened and the liquid pump 37 is started, so that the liquid medicine is pumped from the cylinder 11 into the centrifugal bucket 33 so that the bubbles gradually float out of the liquid medicine under the action of vacuum (the vacuum suction device 32 can maintain the interior of the casing 31 in a vacuum state through suction); then, the centrifugal motor 34 drives the centrifugal bucket 33 to rotate to accelerate the escape speed of the bubbles; after the defoaming treatment is completed, the solenoid valve 36 located on the liquid outlet pipeline is opened and the liquid pump 37 is started to pump the liquid medicine from the centrifugal bucket 33 back to the cylinder 11.

[0033] Embodiment three: The alkali reduction treatment is removed, and the rest is the same as in Example 2.

[0034] After testing, the product was found to have a dissolution retention rate of 74% after being immersed in 60°C hot water for 30 minutes.

[0035] Embodiment 4: Remove the antistatic treatment, and the rest is the same as in Example 2.

[0036] After testing, the product was found to have a dissolution retention rate of 81% after being immersed in 60°C hot water for 30 minutes.

[0037] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A method for modifying silk protein of synthetic fibers, characterized in that: The steps include: a) Pretreatment: firstly, the silk is heated in a weak alkaline solution to be degummed, and then, after being rinsed and dissolved by heating in a neutral salt solution, enzymatic hydrolysis is performed using a protease, and then the enzyme-inactivated enzymatic hydrolyzate is nanofiltered and dried in sequence to obtain silk protein peptide powder; b) Silk making: firstly, silk protein peptide powder, polymer masterbatch and auxiliary functional additives are melt-blended, and then spinning, cooling and drawing are carried out in sequence to obtain internally modified synthetic fibers.

2. The method for modifying silk protein of synthetic fiber according to claim 1, characterized in that: In step a), the weak alkali solution is a sodium carbonate solution with a mass concentration of 0.5-1.5%, the degumming conditions include a degumming temperature of 75-85°C and a degumming time of 15-25 minutes, the neutral salt solution is a potassium chloride solution, a magnesium chloride solution or a calcium chloride solution, or a combination thereof, and the mass concentration is controlled at 20-50%, the protease is papain and / or a neutral protease, and the addition amount is 1-2% of the total weight, the enzymatic hydrolysis conditions include a pH of 7.5-8.5, an enzymatic hydrolysis temperature of 35-45°C and an enzymatic hydrolysis time of 5-10 hours, and after the enzymatic hydrolysis is completed, the enzyme is inactivated by first heating the temperature to 70-80°C and then keeping the temperature for 20-30 minutes, and after the enzyme inactivation is completed, a nanofiltration membrane is used to screen out small molecule silk fibroin of 1000-5000Da.

3. The method for modifying silk protein of synthetic fiber according to claim 1, characterized in that: In step b), the amount of the silk protein peptide powder added is 20-40% of the total mass, the amount of the auxiliary functional additive added is 1-20% of the total mass, the polymer masterbatch is polyethylene terephthalate masterbatch or polyamide masterbatch, the auxiliary functional additive is one or a combination of colorant, fiber lubricant, fiber antioxidant, dispersant and gloss regulator, the fiber lubricant is a stearate lubricant, the fiber antioxidant is a hindered phenol antioxidant, the dispersant is PE wax or PP wax, the gloss regulator is silicone oil or titanium dioxide, side blowing or ring blowing is used for cooling and the wind temperature is controlled at 20-30°C, and during the stretching period, the stretching speed ratio of the first group of stretching rollers and the second group of stretching rollers is controlled at 1.5-2.5:1, the stretching temperature of the first group of stretching rollers is 50-90°C, and the stretching temperature of the second group of stretching rollers is 100-120°C.

4. The method for modifying silk protein of synthetic fibers according to any one of claims 1 to 3, characterized in that: The following steps are also included: c) Alkali weight reduction treatment: first immerse the internally modified synthetic fiber or the synthetic fiber fabric woven from the internally modified synthetic fiber in an alkali weight reduction treatment agent containing 0.5-1.5% NaOH, 5-15% cross-linking agent and 0.5-1.5% surfactant, then react at a temperature of 60-80° C. while stirring for 0.5-1.5 hours, and then wash to neutrality to obtain a primary blank; d) Antistatic treatment: firstly, the primary blank is subjected to a padding treatment by using a padding machine and during the immersion period, the primary blank is immersed in an antistatic treatment agent containing 10-20% chitosan, 15-20% catalyst and 2-5% cross-linking agent, and then reacted for 10-20 minutes while stirring at a temperature of 40-60° C. to obtain a secondary blank; e) Silk protein loading: firstly, the secondary blank is subjected to a padding treatment by using a padding machine and during the immersion period, the secondary blank is immersed in a silk protein treatment agent containing a 5-10% silk fibroin solution and 0.5-1% cross-linking agent, and then reacted at a temperature of 60-80° C. while stirring for 30-60 minutes to obtain a tertiary blank; f) Post-treatment: first steam the tertiary blank with water vapor at 110-120° C. for 5-15 minutes, and then bake the tertiary blank with a setting machine at a temperature of 120-150° C. for 1-2 minutes to obtain a product.

5. The method for modifying silk protein of synthetic fiber according to claim 4, characterized in that: In step c), the cross-linking agent is ethylenediamine, and the surfactant is a cationic surfactant; in step d), the catalyst is sodium acetate, and the cross-linking agent is malonic acid; in step e), the molecular weight of the silk fibroin solution is controlled at 20,000 to 50,000 Daltons, and the cross-linking agent is an EH cross-linking agent.

6. The method for modifying silk protein of synthetic fiber according to claim 5, characterized in that: The impregnation machine comprises an impregnation mechanism (1), a liquid squeezing mechanism (2), a defoaming mechanism (3) and a controller. The impregnation mechanism (1) has a cavity for containing liquid medicine. The liquid squeezing mechanism (2) can squeeze the fabric impregnated with liquid medicine and make the squeezed liquid medicine flow back into the cavity. The liquid squeezing mechanism (2) can cyclically suck out the liquid medicine from the cavity and return it to the cavity after vacuum defoaming. The controller is electrically connected to the liquid squeezing mechanism (2) and the defoaming mechanism (3) respectively.

7. The method for modifying silk protein of synthetic fiber according to claim 6, characterized in that: The impregnation mechanism (1) comprises a cylinder body (11), a pressure roller (12) and a guide roller (13); the cavity is located in the cylinder body (11) and has an opening facing upward; a plurality of pressure rollers (12) are rotatably connected to the cylinder body (11) in the cavity and a liquid pressure gap is formed between each of the plurality of pressure rollers; and a plurality of guide rollers (13) are installed at the opening of the cylinder body (11) and can respectively guide the fabric into and out of the cavity.

8. The method for modifying silk protein of synthetic fiber according to claim 7, characterized in that: The liquid squeezing mechanism (2) comprises a passive roller (21), an active roller (22), a roller frame (23) and a liquid squeezing motor (24); the passive roller (21) and the active roller (22) are respectively rotatably connected to the roller frame (23) and a liquid discharge gap is formed at adjacent surfaces; the roller frame (23) is fixed to the cylinder body (11) and is provided with a liquid squeezing motor (24) capable of driving the active roller (22) to rotate.

9. The method for modifying silk protein of synthetic fiber according to claim 8, characterized in that: The defoaming mechanism (3) comprises a housing (31), a vacuum aspirator (32), a conduit (35), a solenoid valve (36) and a liquid pump (37); a circulation pipeline is formed between the housing (31) and the cylinder body (11) via two conduits (35); and a solenoid valve (36) and a liquid pump (37) are installed on both the liquid inlet pipeline and the liquid outlet pipeline; the housing (31) can use the vacuum aspirator (32) to keep the housing cavity in a vacuum state.

10. The method for modifying silk protein of synthetic fiber according to claim 9, characterized in that: The defoaming mechanism (3) further comprises a centrifugal bucket (33) and a centrifugal motor (34); the centrifugal bucket (33) is located in the shell cavity and driven to rotate by the centrifugal motor (34); the centrifugal bucket (33) is arranged with its mouth facing upward and the mouth facing the liquid outlet of the liquid inlet pipeline; the bottom of the centrifugal bucket (33) comprises an extension tube (331) extending out of the shell (31) and rotatably connected to a guide tube (35) located above the liquid outlet pipeline; and an inner flange (332) is also provided at the mouth of the bucket.

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