Crease-resistant and wear-resistant flax blended yarn and processing technology thereof

Abstract

The invention discloses an anti-wrinkle wear-resistant flax blended yarn and a processing technology thereof, and relates to the technical field of textiles. The prepared flax blended yarn comprises natural fibers, modified polylactic acid fibers and ultra-high molecular weight polyethylene fibers. Wherein the natural fibers are obtained by performing degumming pretreatment on linen fibers and bamboo fibers and then mixing the linen fibers and the bamboo fibers with cotton fibers; graphene oxide is deposited on the surface of the fiber through dopamine polymerization, so that the wear resistance of the yarn is improved; the modified polylactic acid fibers are obtained through melt spinning of polylactic acid, poly (adipic acid) / butylene terephthalate and modified chitin nanofibers, the compatibility of the chitin nanofibers and the polylactic acid is improved through polyethylene glycol, and the polylactic acid fibers are enhanced; coarse yarns are obtained through combing, drawing, roving and spinning, the coarse yarns are soaked in a finishing agent, and finally the finished blended yarns are obtained and have good wear resistance and wrinkle resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and specifically to a wrinkle-resistant and wear-resistant linen blended yarn and its processing technology. Background Art

[0002] As a natural cellulose fiber with a long history, linen fiber has been widely used in the field of high-end textiles for a long time due to its excellent moisture absorption and breathability, antibacterial property, and environmental friendliness. However, pure linen yarn has inherent defects such as high fiber rigidity, low elastic recovery rate, and easy wrinkling, which limit its wide application in modern clothing and industrial textiles.

[0003] In recent years, with the growth of the demand for diversification and functionality of textile materials, combining linen with other fibers through blending technology has become an important research direction for improving its spinnability, mechanical properties, and wearing comfort. For example, blending linen with cotton fiber can relieve the itching feeling of linen, but its wrinkle resistance is still not ideal; blending with polyester fiber can improve dimensional stability, but sacrifices the environmental protection advantages of natural fibers. In this context, new yarn systems with bio-based synthetic fibers (such as polylactic acid PLA) or functional regenerated fibers (such as lyocell, chitin fiber) as blending components have gradually attracted attention. Such blended yarns can not only inherit the natural properties of linen but also achieve the synergistic improvement of functions such as wrinkle resistance and wear resistance through the complementary properties between fibers. However, problems such as weak interfacial bonding between fibers and insufficient optimization of blending process parameters are still the key challenges restricting their industrial application. Therefore, how to construct a durable and wrinkle-resistant linen blended yarn system has become an important research topic in the field of textile materials. Summary of the Invention

[0004] The purpose of the present invention is to provide a wrinkle-resistant and wear-resistant linen blended yarn and its processing technology to solve the problems raised in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A processing technology for a wrinkle-resistant and wear-resistant linen blended yarn, including the following processing steps:

[0007] Step 1: Take linen fiber and bamboo fiber and mix them in pectinase solution, pretreat at 40 - 50 °C for 1 - 1.5 h, transfer to alkali solution after cleaning, treat at 50 - 60 °C for 1 - 1.5 h, take out, clean, dry, and mix with cotton fiber for standby to obtain natural mixed fibers; take polyethyleneimine in Tris buffer solution, add dopamine hydrochloride, stir evenly, pour into natural mixed fibers, soak for 2 - 3 h, take out and clean, immerse in graphene oxide solution, ultrasonically disperse for 20 - 30 min, irradiate with microwave for 3 - 5 min, rinse and dry to obtain linen mixed fibers;

[0008] Step 2: Mix the modified chitin nanofibers with polylactic acid, polybutylene adipate terephthalate, and dicumyl peroxide, and perform melt spinning to obtain modified polylactic acid fibers. Mix the flax blended fibers prepared in Step 1 with the modified polylactic acid fibers and perform combing to obtain the first comber sliver. Mix the flax blended fibers prepared in Step 1 with ultra-high molecular weight polyethylene fibers and perform combing to obtain the second comber sliver, and perform combing on the flax blended fibers to obtain the third comber sliver. Combine the first comber sliver and the second comber sliver, and perform the roving process, spinning process, and winding process on the combined second comber sliver to obtain the semi-finished yarn;

[0009] Step 3: Immerse the semi-finished yarn obtained above in a sodium hydroxide solution for 30 - 40 min, wash it, then impregnate it in a finishing agent, treat it for 3 - 5 min, and then dry it to obtain the finished product.

[0010] Preferably, the processing steps of the modified chitin nanofibers are as follows: Place toluene diisocyanate, polyethylene glycol, and chitin nanofibers in N,N-dimethylformamide respectively to prepare Solution a, Solution b, and Solution c. Add dibutyltin dilaurate to Solution a, heat it to 60 - 70 °C, dropwise add Solution b, react until the -NCO content is 0.01 - 0.02%, add Solution c, raise the temperature to 70 - 80 °C, react for 8 - 10 h, then separate, wash with alcohol and water, and dry to obtain the modified chitin nanofibers.

[0011] Preferably, in Step 1, the mass ratio of flax fiber, bamboo fiber, and cotton fiber is 5:(1 - 3):(1 - 2); the concentration ratio of polyethyleneimine to dopamine hydrochloride is 1:(1 - 3) g / mL, and the concentration of the graphene oxide solution is 0.2 - 0.5 g / mL.

[0012] Preferably, in Step 1, the concentration of the pectinase solution is 1 - 3 g / L, the pH is 3 - 4, and the material-liquid ratio is 1:20; the alkali solution includes 5 - 8% sodium hydroxide, 6 - 10% hydrogen peroxide, 3 - 5% sodium carbonate, 2 - 5% urea, and the balance is deionized water, and the material-liquid ratio is 1:15.

[0013] Preferably, the modified polylactic acid fibers in Step 2 include the following raw materials in parts by mass: 80 - 100 parts of polylactic acid, 12 - 15 parts of polybutylene adipate terephthalate, 15 - 18 parts of modified chitin nanofibers, 0.05 - 0.07 parts of dicumyl peroxide; the temperature of melt spinning is 200 - 220 °C.

[0014] Preferably, in Step 2, the dosage ratio of the flax blended fibers, modified polylactic acid fibers, and ultra-high molecular weight fibers is 100:(40 - 50):(5 - 10).

[0015] Preferably, the dosage ratio of chitin nanofibers, toluene diisocyanate, and polyethylene glycol is 1:(0.2 - 0.3):(2 - 3).

[0016] Preferably, the finishing agent comprises: 3-10% silk fibroin solution, 3 g / L chitosan, 20 g / L 1,2,3,4-butanetetracarboxylic acid, 10 g / L triethanolamine, and 40 g / L sodium hypophosphite; the concentration of sodium hydroxide is 20 g / L.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention uses natural fibers such as flax and bio-based synthetic fibers for blended spinning, and the raw material sources are safe; among them, the natural fibers are degummed by the combined treatment of pectinase and chemical alkali to reduce fiber damage and achieve high-quality fibers; then dopamine and graphene oxide are deposited on the fiber surface by impregnation, and the interfacial binding force of graphene oxide on the fiber surface is improved by polydopamine and polyethyleneimine to obtain fibers covered with a graphene oxide nanolayer on the surface, improving the abrasion resistance of the subsequent yarns and additionally bringing an antibacterial effect;

[0019] 2. For the bio-based synthetic fiber polylactic acid, the toughness of polylactic acid is improved by adding polybutylene adipate / terephthalate and modified chitin nanofibers, the compatibility and toughness of polylactic acid are improved, and the spinnability of the melt-spun polylactic acid fiber is improved; in addition, the chitin nanofibers graft copolymerize to insert polyethylene glycol into the chitin nanofibers, improving the compatibility between the chitin nanofibers and polylactic acid and the dispersibility, achieving a better strengthening effect; in addition, ultra-high molecular weight polyethylene fibers are introduced in combing to further improve the abrasion resistance of the produced yarns;

[0020] 3. Through the action of sodium hydroxide and the finishing agent, the overall anti-wrinkle effect of the yarns obtained in the present invention is further improved, bringing a better application effect. Specific Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] In the experiment, the flax fiber length is 20-25 mm; the bamboo fiber is 10-15 mm; the cotton fiber is 20-25 mm; the ultra-high molecular weight polyethylene fiber is 50-55 mm; the graphene oxide sheet diameter is 0.5-5 μm; the polyethyleneimine is 1800 Da, the polylactic acid is 6 KDa, the polybutylene adipate / terephthalate is 120 KDa, the polyethylene glycol is 4 KDa; the silk fibroin is 6-10 KDa, and the viscosity of chitosan is 100-200 mPa·s;

[0023] The pectinase concentration is 1 g / L; the alkaline solution includes 8% sodium hydroxide, 8% hydrogen peroxide, 3% sodium carbonate, 5% urea, and the balance is deionized water;

[0024] The microwave irradiation power is 300 W;

[0025] The unified specification of the produced yarn is 16.6 tex with a twist of 830.4 turns / m;

[0026] Example 1: This example provides a processing technology for wrinkle-resistant and wear-resistant linen blended yarns. The specific steps are as follows:

[0027] Step 1: Take 50 parts of linen fibers and 30 parts of bamboo fibers and mix them in a pectinase solution. According to the material-liquid ratio of 1:20, pretreat them at 50 °C for 1 h. After washing, transfer them to the alkaline solution. According to the material-liquid ratio of 1:15, treat them at 60 °C for 1.5 h. Take them out, wash, dry, and mix them with 20 parts of cotton fibers for standby to obtain natural mixed fibers; Take polyethyleneimine and place it in Tris buffer solution, add dopamine hydrochloride to form a mixed solution with a polyethyleneimine concentration of 1 g / mL and a dopamine hydrochloride concentration of 2 g / mL. After stirring evenly, pour it into the natural mixed fibers. After soaking for 3 h, take them out, wash, immerse them in a graphene oxide solution with a concentration of 0.3 g / mL, ultrasonically disperse for 30 min, then microwave irradiate for 5 min, rinse, and dry to obtain linen mixed fibers;

[0028] Step 2: Mix 6 parts of modified chitin nanofibers, 34 parts of polylactic acid, 5 parts of polybutylene adipate / terephthalate, and 0.02 parts of diisopropylbenzene peroxide, and melt-spin them at 220 °C to obtain modified polylactic acid fibers. Mix and comb the linen mixed fibers prepared in Step 1 and the modified polylactic acid fibers to obtain the first combed sliver. Mix and comb the linen mixed fibers prepared in Step 1 and ultra-high molecular weight polyethylene fibers to obtain the second combed sliver, and comb the linen mixed fibers to obtain the third combed sliver; Draw the first combed sliver and the second combed sliver, and the second combed sliver, and then perform the roving process, the spinning process, and the winding process to obtain the semi-finished yarn; Among them, the dosage ratio of the linen mixed fibers, the modified polylactic acid fibers, and the ultra-high molecular weight fibers is 100:45.02:8;

[0029] Step 3: Immerse the semi-finished yarn obtained above in a 20 g / L sodium hydroxide solution for 40 min. After washing, impregnate it in the finishing agent, treat it for 3 h, and then dry it to obtain the finished product; Among them, the finishing agent includes: 8% silk fibroin solution, 3 g / L chitosan, 20 g / L 1,2,3,4-butanetetracarboxylic acid, 10 g / L triethanolamine, and 40 g / L sodium hypophosphite.

[0030] Among them, the processing steps of the modified chitin nanofibers are as follows: 0.43 g of toluene diisocyanate, 5 g of polyethylene glycol, and 2 g of chitin nanofibers are respectively placed in N,N-dimethylformamide to prepare solution a, solution b, and solution c. 0.02 g of dibutyltin dilaurate is added to solution a, heated to 70 °C, solution b is added dropwise, and the reaction is carried out until the -NCO content is about 0.019%. Solution c is added, the temperature is raised to 80 °C, and after reacting for 10 h, separation is carried out. After washing with alcohol and water and drying, the modified chitin nanofibers are obtained.

[0031] Example 2: This example provides a processing technology for an anti-wrinkle and wear-resistant linen blended yarn, and the specific steps are as follows:

[0032] Step 1: Take 50 parts of linen fibers and 30 parts of bamboo fibers and mix them in a pectinase solution. According to the material-liquid ratio of 1:20, pretreat at 50 °C for 1 h, wash and transfer to an alkali solution. According to the material-liquid ratio of 1:15, treat at 60 °C for 1.5 h, take out, wash, dry, and mix with 20 parts of cotton fibers for standby to obtain natural mixed fibers; Take polyethyleneimine and place it in a Tris buffer solution, add dopamine hydrochloride to form a mixed solution with a polyethyleneimine concentration of 1 g / mL and a dopamine hydrochloride concentration of 3 g / mL. After stirring evenly, pour it into the natural mixed fibers. After soaking for 3 h, take out and wash, immerse in a graphene oxide solution with a concentration of 0.5 g / mL, ultrasonically disperse for 30 min, irradiate with microwave for 5 min, rinse and dry to obtain linen mixed fibers;

[0033] Step 2: Mix 6 parts of modified chitin nanofibers, 37 parts of polylactic acid, 5.5 parts of polybutylene adipate / terephthalate, and 0.02 parts of diisopropylbenzene peroxide, and melt-spin at 220 °C to obtain modified polylactic acid fibers. Mix and comb the linen mixed fibers prepared in Step 1 and the modified polylactic acid fibers to obtain the first combed sliver. Mix and comb the linen mixed fibers prepared in Step 1 and ultra-high molecular weight polyethylene fibers to obtain the second combed sliver, and comb the linen mixed fibers to obtain the third combed sliver; Carry out the roving process, spinning process, and winding process on the first combed sliver and the second combed sliver, and the second combed sliver after drawing to obtain a semi-finished yarn; Among them, the dosage ratio of the linen mixed fibers, modified polylactic acid fibers, and ultra-high molecular weight fibers is 100:48.52:10;

[0034] Step 3: Place the semi-finished yarn obtained above in a 20 g / L sodium hydroxide solution and treat for 40 min. After washing, impregnate it in a finishing agent, treat for 3 h and then dry to obtain the finished product; Among them, the finishing agent includes: 10% silk fibroin solution, 3 g / L chitosan, 20 g / L of 1,2,3,4-butanetetracarboxylic acid, 10 g / L of triethanolamine, and 40 g / L of sodium hypophosphite.

[0035] Among them, the processing steps of the modified chitin nanofibers are as follows: 0.43 g of toluene diisocyanate, 5 g of polyethylene glycol, and 2 g of chitin nanofibers are respectively placed in N,N-dimethylformamide to prepare solution a, solution b, and solution c. 0.02 g of dibutyltin dilaurate is added to solution a, heated to 70 °C, solution b is dropped, and the reaction is carried out until the -NCO content is about 0.019%. Solution c is added, the temperature is raised to 80 °C, and after reacting for 10 h, separation is carried out, followed by washing with alcohol and water and then drying to obtain the modified chitin nanofibers.

[0036] Example 3: This example provides a processing process for a wrinkle-resistant and wear-resistant linen blended yarn, and the specific steps are as follows:

[0037] Step 1: Take 50 parts of linen fibers and 30 parts of bamboo fibers and mix them in a pectinase solution. According to the material-liquid ratio of 1:20, pretreat at 50 °C for 1 h, wash and transfer to an alkali solution. According to the material-liquid ratio of 1:15, treat at 60 °C for 1.5 h, take out, wash, dry, and mix with 20 parts of cotton fibers for standby to obtain natural mixed fibers; take polyethyleneimine and place it in a Tris buffer solution, add dopamine hydrochloride to form a mixed solution with a polyethyleneimine concentration of 1 g / mL and a dopamine hydrochloride concentration of 1 g / mL. After stirring evenly, pour it into the natural mixed fibers. After soaking for 3 h, take out and wash, immerse in a graphene oxide solution with a concentration of 0.2 g / mL, ultrasonically disperse for 30 min, irradiate with microwaves for 5 min, rinse, and dry to obtain linen mixed fibers;

[0038] Step 2: Mix 6 parts of modified chitin nanofibers, 32 parts of polylactic acid, 4.5 parts of polybutylene adipate / terephthalate, and 0.02 parts of diisopropylbenzene peroxide, and melt-spin at 220 °C to obtain modified polylactic acid fibers. Mix and comb the linen mixed fibers prepared in Step 1 and the modified polylactic acid fibers to obtain the first combed sliver, mix and comb the linen mixed fibers prepared in Step 1 and ultra-high molecular weight polyethylene fibers to obtain the second combed sliver, and comb the linen mixed fibers to obtain the third combed sliver; Carry out the roving process, the spinning process, and the winding process on the first combed sliver and the second combed sliver, and the second combed sliver after drawing to obtain a semi-finished yarn; Among them, the dosage ratio of the linen mixed fibers, the modified polylactic acid fibers, and the ultra-high molecular weight fibers is 100:42.52:6;

[0039] Step 3: Place the semi-finished yarn obtained above in a 20 g / L sodium hydroxide solution and treat for 40 min. After washing, impregnate it in a finishing agent, treat for 3 h, and then dry to obtain the finished product; Among them, the finishing agent includes: 3% silk fibroin solution, 3 g / L chitosan, 20 g / L of 1,2,3,4-butanetetracarboxylic acid, 10 g / L of triethanolamine, and 40 g / L of sodium hypophosphite.

[0040] Among them, the processing steps of the modified chitin nanofibers are as follows: 0.43 g of toluene diisocyanate, 5 g of polyethylene glycol, and 2 g of chitin nanofibers are respectively placed in N,N-dimethylformamide to prepare solution a, solution b, and solution c. 0.02 g of dibutyltin dilaurate is added to solution a, heated to 70 °C, solution b is added dropwise, and the reaction is carried out until the -NCO content is about 0.019%. Solution c is added, the temperature is raised to 80 °C, and after reacting for 10 h, separation is carried out. After washing with alcohol and water and drying, the modified chitin nanofibers are obtained.

[0041] Comparative Example 1: As a control experiment for Example 1, no post-treatment is carried out on the natural blended fibers. The specific steps are as follows:

[0042] Step 1: Take 50 parts of flax fibers and 30 parts of bamboo fibers, mix them and place them in a pectinase solution. According to the material-liquid ratio of 1:20, pretreat at 50 °C for 1 h. After washing, transfer them to an alkali solution. According to the material-liquid ratio of 1:15, treat at 60 °C for 1.5 h. Take out, wash, dry, and mix with 20 parts of cotton fibers for standby to obtain natural blended fibers.

[0043] Step 2: Mix 6 parts of modified chitin nanofibers, 34 parts of polylactic acid, 5 parts of polybutylene adipate / terephthalate, and 0.02 parts of diisopropylbenzene peroxide, and melt-spin at 220 °C to obtain modified polylactic acid fibers. The natural blended fibers prepared in Step 1 and the modified polylactic acid fibers are mixed and combed to obtain the first combed sliver. The natural blended fibers prepared in Step 1 and ultra-high molecular weight polyethylene fibers are mixed and combed to obtain the second combed sliver, and the natural blended fibers are combed to obtain the third combed sliver. The first combed sliver and the second combed sliver, and the second combed sliver are drawn and then subjected to the roving process, the spinning process, and the winding process to obtain the semi-finished yarn. Among them, the usage ratio of the natural blended fibers, the modified polylactic acid fibers, and the ultra-high molecular weight fibers is 100:45.02:8.

[0044] Step 3: Place the semi-finished yarn obtained above in a 20 g / L sodium hydroxide solution and treat for 40 min. After washing, impregnate it in a finishing agent, treat for 3 times and then dry to obtain the finished product. Among them, the finishing agent includes: 8% silk fibroin solution, 3 g / L chitosan, 20 g / L of 1,2,3,4-butanetetracarboxylic acid, 10 g / L of triethanolamine, and 40 g / L of sodium hypophosphite.

[0045] Among them, the processing steps of the modified chitin nanofibers are as follows: 0.43 g of toluene diisocyanate, 5 g of polyethylene glycol, and 2 g of chitin nanofibers are respectively placed in N,N-dimethylformamide to prepare solution a, solution b, and solution c. 0.02 g of dibutyltin dilaurate is added to solution a, heated to 70 °C, solution b is added dropwise, and the reaction is carried out until the -NCO content is about 0.019%. Solution c is added, the temperature is raised to 80 °C, and after reacting for 10 h, separation is carried out. After washing with alcohol and water and drying, the modified chitin nanofibers are obtained.

[0046] Comparative Example 2: A control experiment for Example 1 was carried out without modifying the chitin nanofibers. The specific steps are as follows:

[0047] Step 1: Take 50 parts of flax fiber and 30 parts of bamboo fiber and mix them in a pectinase solution. According to the material-liquid ratio of 1:20, pretreat them at 50 °C for 1 h. After cleaning, transfer them to an alkali solution. According to the material-liquid ratio of 1:15, treat them at 60 °C for 1.5 h. Take them out, clean, dry, and mix them with 20 parts of cotton fiber for standby to obtain natural blended fibers; Take polyethyleneimine and place it in a Tris buffer solution, add dopamine hydrochloride to form a mixed solution with a polyethyleneimine concentration of 1 g / mL and a dopamine hydrochloride concentration of 2 g / mL. After stirring evenly, pour it into the natural blended fibers. After soaking for 3 h, take them out, clean, and immerse them in a graphene oxide solution with a concentration of 0.3 g / mL. After ultrasonic dispersion for 30 min, irradiate them with microwave for 5 min, rinse, and dry to obtain flax blended fibers;

[0048] Step 2: Mix 6 parts of chitin nanofibers, 34 parts of polylactic acid, 5 parts of polybutylene adipate / terephthalate, and 0.02 parts of diisopropylbenzene peroxide, and melt-spin them at 220 °C to obtain modified polylactic acid fibers. Mix and comb the flax blended fibers prepared in Step 1 and the modified polylactic acid fibers to obtain the first combed sliver. Mix and comb the flax blended fibers prepared in Step 1 and ultra-high molecular weight polyethylene fibers to obtain the second combed sliver, and comb the flax blended fibers to obtain the third combed sliver; Combine the first combed sliver and the second combed sliver, and the second combed sliver, and perform the roving process, the spinning process, and the winding process to obtain the semi-finished yarn; The usage ratio of the flax blended fibers, the modified polylactic acid fibers, and the ultra-high molecular weight fibers is 100:45.02:8;

[0049] Step 3: Immerse the semi-finished yarn obtained above in a 20 g / L sodium hydroxide solution for 40 min, clean it, then impregnate it in a finishing agent, treat it for 3 times, and dry it to obtain the finished product; Among them, the finishing agent includes: 8% silk fibroin solution, 3 g / L chitosan, 20 g / L 1,2,3,4-butanetetracarboxylic acid, 10 g / L triethanolamine, and 40 g / L sodium hypophosphite.

[0050] Comparative Example 3: A control experiment for Example 1 was carried out without alkali treatment and finishing of the semi-finished yarn. The specific steps are as follows:

[0051] Step 1: Take 50 parts of flax fiber and 30 parts of bamboo fiber, mix them and place them in a pectinase solution. According to the material-liquid ratio of 1:20, pretreat them at 50°C for 1 h. After washing, transfer them to an alkali solution. According to the material-liquid ratio of 1:15, treat them at 60°C for 1.5 h. Take them out, wash, dry and mix them with 20 parts of cotton fiber for standby to obtain natural blended fibers. Take polyethyleneimine and place it in a Tris buffer solution, add dopamine hydrochloride to form a mixed solution with a polyethyleneimine concentration of 1 g / mL and a dopamine hydrochloride concentration of 2 g / mL. After stirring evenly, pour it into the natural blended fibers. After soaking for 3 h, take them out, wash and immerse them in a graphene oxide solution with a concentration of 0.3 g / mL. After ultrasonic dispersion for 30 min, irradiate them with microwave for 5 min. After rinsing, dry them to obtain flax blended fibers;

[0052] Step 2: Mix 6 parts of modified chitin nanofibers, 34 parts of polylactic acid, 5 parts of polybutylene adipate / terephthalate, and 0.02 parts of diisopropylbenzene peroxide, and melt-spin them at 220°C to obtain modified polylactic acid fibers. Mix and comb the flax blended fibers prepared in Step 1 and the modified polylactic acid fibers to obtain the first combed sliver. Mix and comb the flax blended fibers prepared in Step 1 and ultra-high molecular weight polyethylene fibers to obtain the second combed sliver, and comb the flax blended fibers to obtain the third combed sliver. Draw the first combed sliver and the second combed sliver, and the second combed sliver and then carry out the roving process, the spinning process and the winding process to obtain the raw yarn. Among them, the dosage ratio of the flax blended fibers, the modified polylactic acid fibers and the ultra-high molecular weight fibers is 100:45.02:8.

[0053] Among them, the processing steps of the modified chitin nanofibers are as follows: Place 0.43 g of toluene diisocyanate, 5 g of polyethylene glycol and 2 g of chitin nanofibers in N,N-dimethylformamide respectively to prepare solution a, solution b and solution c. Add 0.02 g of dibutyltin dilaurate to solution a, heat it to 70°C, dropwise add solution b, react until the -NCO content is about 0.019%, add solution c, raise the temperature to 80°C, react for 10 h and then separate. After washing with alcohol and water and drying, obtain the modified chitin nanofibers.

[0054] Detection test

[0055] 1. Determination of breaking strength: Refer to GB / T 3916-2013 "Textiles - Yarns in packages - Determination of breaking force and elongation at break of single yarns (CRE method)" for testing, and record the breaking strength in Table 1;

[0056] 2. Wear resistance test: Refer to FZ / T 01058-1999 "Test method for yarn wear resistance - Reciprocating roller method", use the LFY-109A type computer multi-functional yarn wear resistance tester, and the experimental parameters are: friction speed 60 times / min, weight 10 g, sandpaper No. 600, and record the average number of friction times in Table 1;

[0057] 3. Anti-wrinkle performance test: The yarns prepared in Examples 1-3 and Comparative Examples 1-3 were used for woven weaving. Fabric samples were made according to a warp density of 62 threads / cm and a weft density of 34 threads / cm. The crease recovery angle of the fabric was tested according to GB / T 3819-1997 "Textiles - Determination of the recovery angle of fabric creases", and the average values in the warp and weft directions were calculated and shown in Table 1.

[0058] Table 1

[0059]

[0060] Conclusion: From the above data, it can be seen that Example 1 has good performance compared with the other examples; in Comparative Example 1, the deposition of polydopamine and graphene oxide on the surface of natural blended fibers has an obvious impact on the abrasion resistance of the yarn; in Comparative Example 2, the non-modification of chitin nanofibers with polyethylene glycol has a greater impact on the breaking strength of the yarn. It can be seen that the modification of chitin nanofibers with polyethylene glycol effectively improves its compatibility in polylactic acid to achieve an enhancement effect; in Comparative Example 3, without finishing, only the crease recovery angle decreases significantly, and the finishing agent effectively improves the anti-wrinkle performance of the yarn.

[0061] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A processing technology for wrinkle-resistant and wear-resistant linen blended yarn, characterized in that, It includes the following processing steps: Step 1: Take flax fiber and bamboo fiber and mix them in a pectinase solution, pretreat them at 40 - 50 °C for 1 - 1.5 h, transfer them to an alkali solution after cleaning, treat them at 50 - 60 °C for 1 - 1.5 h, take them out, clean, dry and mix with cotton fiber for standby to obtain natural mixed fiber; Take polyethyleneimine and place it in Tris buffer solution, add dopamine hydrochloride, stir evenly and pour it into the natural mixed fiber. After soaking for 2 - 3 h, take it out and clean it, then immerse it in graphene oxide solution, ultrasonically disperse for 20 - 30 min, irradiate with microwave for 3 - 5 min, rinse and dry to obtain flax mixed fiber; Step 2: Mix modified chitin nanofibers, polylactic acid, polybutylene adipate / terephthalate, and dicumyl peroxide and melt-spin them to obtain modified polylactic acid fiber. Mix and comb the flax mixed fiber prepared in Step 1 and the modified polylactic acid fiber to obtain the first combed sliver. Mix and comb the flax mixed fiber prepared in Step 1 and ultra-high molecular weight polyethylene fiber to obtain the second combed sliver, and comb the flax mixed fiber to obtain the third combed sliver; Draw the first combed sliver and the second combed sliver, and the second combed sliver, and then perform the roving process, the spinning process and the winding process to obtain the semi-finished yarn; Step 3: Place the semi-finished yarn obtained above in sodium hydroxide solution and treat it for 30 - 40 min, clean it, impregnate it in the finishing agent, treat it for 3 - 5 min and then dry it to obtain the finished product.

2. The processing technology of an anti-wrinkle and wear-resistant linen blended yarn according to claim 1, characterized in that, The processing steps of modified chitin nanofibers are as follows: Place toluene diisocyanate, polyethylene glycol and chitin nanofibers in N,N-dimethylformamide respectively to prepare solution a, solution b and solution c. Add dibutyltin dilaurate to solution a, heat to 60 - 70 °C, dropwise add solution b, react until the -NCO content is 0.01 - 0.02%, add solution c, raise the temperature to 70 - 80 °C, react for 8 - 10 h and then separate, wash with alcohol and water and then dry to obtain modified chitin nanofibers.

3. The processing technology of an anti-wrinkle and wear-resistant linen blended yarn according to claim 1, characterized in that, In Step 1, the mass ratio of flax fiber, bamboo fiber and cotton fiber is 5:(1 - 3):(1 - 2); the concentration ratio of polyethyleneimine and dopamine hydrochloride is 1:(1 - 3) g / mL, and the concentration of graphene oxide solution is 0.2 - 0.5 g / mL.

4. The processing technology of an anti-wrinkle and wear-resistant linen blended yarn according to claim 1, characterized in that, In Step 1, the concentration of the pectinase solution is 1 - 3 g / L, the pH is 3 - 4, and the material-liquid ratio is 1:20; the alkali solution includes 5 - 8% sodium hydroxide, 6 - 10% hydrogen peroxide, 3 - 5% sodium carbonate, 2 - 5% urea and the balance is deionized water, and the material-liquid ratio is 1:

15.

5. The processing technology of a wrinkle-resistant and wear-resistant linen blended yarn according to claim 1, characterized in that, In Step 2, the modified polylactic acid fiber includes the following raw materials in parts by mass: 80 - 100 parts of polylactic acid, 12 - 15 parts of polybutylene adipate / terephthalate, 15 - 18 parts of modified chitin nanofibers, 0.05 - 0.07 parts of dicumyl peroxide; the temperature of melt spinning is 200 - 220 °C.

6. The processing technology of an anti-wrinkle and wear-resistant linen blended yarn according to claim 1, characterized in that In Step 2, the dosage ratio of the flax mixed fiber, the modified polylactic acid fiber and the ultra-high molecular weight fiber is 100:(40 - 50):(5 - 10).

7. The processing technology of a wrinkle-resistant and wear-resistant linen blended yarn according to claim 2, characterized in that, The dosage ratio of chitin nanofibers, toluene diisocyanate and polyethylene glycol is 1:(0.2 - 0.3):(2 - 3).

8. The processing technology of a wrinkle-resistant and wear-resistant linen blended yarn according to claim 1, characterized in that, The finishing agent includes: 3-10% silk fibroin solution, 3 g / L chitosan, 20 g / L 1,2,3,4-butanetetracarboxylic acid, 10 g / L triethanolamine, and 40 g / L sodium hypophosphite; the concentration of sodium hydroxide is 20 g / L.

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