A PA tufted recyclable yarn and an automotive carpet

Abstract

This application relates to the technical field of automotive accessories, and specifically discloses a PA tufted recyclable yarn and an automotive carpet. The PA tufted recyclable yarn is composed of modified PA fibers, cotton fibers, and bamboo fibers. The modified PA fibers include the following raw materials in parts by weight: 40-80 parts of PA fibers, 10-20 parts of lignin-graphene composite, 5-6 parts of bamboo charcoal powder, 2-3 parts of kaolin, 8-10 parts of waterborne polyurethane, 1-3 parts of sophorolipid, and 6-8 parts of silane coupling agent. The above-mentioned formulation is simple and the ratio is rigorous. The obtained PA tufted recyclable yarn has excellent wear resistance, remarkable anti-aging property, and can be recycled and reused. The automotive carpet sequentially includes a carpet surface layer, an anti-slip layer, and an antibacterial layer, and there is a hot melt adhesive lining between the layers. The carpet surface layer is spun from the PA tufted recyclable yarn. The obtained automotive carpet has excellent comprehensive performance and broad market prospects.

Description

Technical Field

[0001] The present application relates to the technical field of automotive accessories, and more specifically, it relates to a PA tufted recyclable yarn and an automotive carpet. Background Art

[0002] Automotive carpets are an important part of automotive interiors. They can not only enhance the beauty and comfort of the interior of the car, but also have functions such as noise reduction, temperature regulation, and corrosion prevention. In addition, automotive carpets can also protect the car floor and effectively prevent the floor from being scratched by gravel on the soles of shoes. With the rapid development of the economy and technology, the focus of people's attention on automotive carpets has gradually shifted from appearance and comfort to environmental protection. At present, the focus on the environmental performance of automotive carpets is mainly concentrated on the recycling and reuse of the raw materials for preparing automotive carpets.

[0003] Polyamide fiber (PA) is often used as a raw material for preparing automotive carpets. PA fibers have many advantages such as high breaking strength, good breaking elongation, good elastic recovery rate, good hygroscopicity, good dyeability, relatively high gloss, good heat resistance, and good chemical resistance, which determine the feasibility of recycling and reusing PA fibers. However, during the use of automotive carpets, the existing PA fibers are severely worn and prone to aging, making it impossible for PA fibers to meet the high requirements of recycling and reusing well. Therefore, there is an urgent need to propose a PA tufted recyclable yarn and an automotive carpet to solve the problems of poor wear resistance and anti-aging performance of the existing PA fibers, enable the PA tufted yarn to be recycled and reused, and be better used for preparing automotive carpets, which has positive significance for sustainable development. Summary of the Invention

[0004] In order to solve the problems of poor wear resistance and anti-aging performance of the existing PA fibers, the present application provides a PA tufted recyclable yarn and an automotive carpet.

[0005] In the first aspect, the present application provides a PA tufted recyclable yarn, adopting the following technical solution:

[0006] A PA tufted recyclable yarn is composed of modified PA fibers, cotton fibers, and bamboo fibers;

[0007] The modified PA fibers include the following raw materials in parts by weight: 40 - 80 parts of PA fibers, 10 - 20 parts of lignin-graphene composite, 5 - 6 parts of bamboo charcoal powder, 2 - 3 parts of kaolin, 8 - 10 parts of waterborne polyurethane, 1 - 3 parts of sophorolipid, 20 - 30 parts of N,N-dimethylformamide, 6 - 8 parts of silane coupling agent, 10 - 20 parts of ethanol, and 30 - 50 parts of water.

[0008] By adopting the above technical solution, cotton fibers have good moisture absorption and air permeability, bamboo fibers have high wear resistance and strong toughness, can absorb moisture and breathe, antibacterial and bacteriostatic, and anti-ultraviolet, and bamboo fibers belong to natural and environmentally friendly materials; the modified PA fibers have excellent wear resistance, anti-aging properties, and remarkable waterproof, flame retardant, and antibacterial properties; the PA tufted yarn of the present application is composed of modified PA fibers, cotton fibers, and bamboo fibers, and the obtained PA tufted yarn has excellent comprehensive performance, has the positive significance of being recyclable and sustainable development, and can be better applied to the automotive field.

[0009] In addition, the modified PA fibers of the present application are composed of raw materials such as PA fibers, lignin-graphene composites, bamboo charcoal powder, kaolin, and waterborne polyurethane. PA fibers have characteristics such as high breaking strength, impact resistance, and good dimensional stability; the lignin-graphene composite combines the advantages of lignin and graphene well. The lignin-graphene composite can effectively improve the heat resistance and anti-aging effect of PA fibers, and can also enhance the wear resistance of PA fibers; bamboo charcoal powder has a porous structure and a super high specific surface area, has strong adsorption ability, can absorb moisture and prevent mildew, antibacterial and insect repellent, reduce the content of VOCs, and has the significance of environmental protection; kaolin can improve the flame retardant performance of PA fibers, and can also enhance the wear resistance of PA fibers; waterborne polyurethane has excellent wear resistance and weather resistance, and good film-forming properties, and can form a protective film on the surface of PA fibers, further improving the durability of PA fibers and effectively enhancing the mechanical properties of PA fibers.

[0010] The components in the modified PA fibers of the present application interact with each other and are tightly combined, so that the wear resistance and anti-aging properties of the prepared modified PA fibers are greatly improved, and at the same time, the modified PA fibers obtain excellent flame retardant properties, antibacterial properties, and waterproof properties; therefore, the comprehensive performance of the finally prepared PA tufted recyclable yarn is better.

[0011] Preferably, the modified PA fibers are prepared by the following method:

[0012] S1. Add a silane coupling agent and ethanol into water, after ultrasonic dispersion, stand for hydrolysis for 40 - 60 min to obtain an alcoholyzed silane coupling agent solution; at a temperature of 45 - 50 °C, add bamboo charcoal powder and kaolin, and stir and react at a rotation speed of 800 - 1000 r / min for 30 - 50 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin;

[0013] S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, PA fibers, lignin-graphene composites, waterborne polyurethane, and sophorolipid into N,N-dimethylformamide, adjust the pH value to 8 - 10, heat up to 60 - 90 °C, react for 4 - 10 h, then filter and dry to obtain modified PA fibers.

[0014] By adopting the above technical solution, during the preparation of the modified PA fiber in this application, first, the silane coupling agent is alcoholyzed, and the alcoholyzed silane coupling agent is used to treat bamboo charcoal powder and kaolin, so that active groups appear on the surfaces of the bamboo charcoal powder and kaolin, obtaining modified bamboo charcoal powder and modified kaolin; then the modified bamboo charcoal powder, modified kaolin, PA fiber, lignin-graphene composite, and waterborne polyurethane are mixed. After being uniformly dispersed under the action of sophorolipid, the substances interact with each other and can be organically combined together. At the same time, this application strictly controls each process parameter, so that the overall performance of the modified PA fiber is effectively improved.

[0015] Preferably, the PA fiber is pretreated, and the specific operation is as follows:

[0016] S11. First, the PA fiber is alkali-leached and then filtered. Then the alkali-treated PA fiber is added to a mixed solution of sodium dihydrogen phosphate and formaldehyde, heated to 50-60°C, and reacted for 4-6 h. After filtration, washing, and drying, activated PA fiber is obtained;

[0017] S12. The activated PA fiber obtained in step S11 is dispersed in an acetone solution, stirred evenly, diethylenetriamine and dodecyldiethanolamine are added, heated to 70-80°C, and reacted for 6-10 h to obtain pretreated PA fiber.

[0018] Preferably, the pretreated PA fiber includes the following raw materials in parts by weight: 10-20 parts of PA fiber, 30-40 parts of 30 wt% sodium hydroxide solution, 10-15 parts of sodium dihydrogen phosphate, 5-8 parts of formaldehyde, 1-3 parts of diethylenetriamine, and 8-12 parts of dodecyldiethanolamine.

[0019] By adopting the above technical solution, the PA fiber in this application is pretreated. First, the PA fiber is alkali-leached, which can remove the sizing agent on the surface of the PA fiber. Subsequently, under the oxidation of formaldehyde, the surface of the PA fiber is activated to generate hydroxymethyl; then the activated PA fiber is combined with the polar macromolecule dodecyldiethanolamine, so that active groups are generated on the surface of the PA fiber, and the PA fiber can better combine with other substances in the form of chemical bonds, thereby improving the comprehensive performance of the modified PA fiber.

[0020] Preferably, the lignin-graphene composite is prepared by the following method:

[0021] S21. First, lignin and phenol are added to a solution of trifluoropropionic acid and formic acid, mixed evenly, and reacted at 80-100°C for 40-60 min. After filtration, washing, and drying, phenolic lignin is obtained;

[0022] S22. Add the phenolic lignin obtained in step S21 to tris(hydroxymethyl)aminomethane, stir at a temperature of 60 - 70 °C and a rotation speed of 1800 - 2200 r / min for 5 - 15 min, then add carboxylated graphene, continue to stir for 1 - 2 h, then filter and dry to obtain the lignin-graphene composite.

[0023] Preferably, the lignin-graphene composite comprises the following raw materials in parts by weight: 20 - 30 parts of lignin, 10 - 15 parts of phenol, 2 - 6 parts of 80 - 90 wt% formic acid solution, 1 - 3 parts of trifluoropropionic acid, 30 - 40 parts of tris(hydroxymethyl)aminomethane, 20 - 25 parts

[0024] of carboxylated graphene.

[0025] By adopting the above technical solution, in the process of preparing the lignin-graphene composite in this application, first, lignin and phenol are used to form phenolic lignin under acidic conditions, so that a large number of active phenolic hydroxyl groups are generated on the surface of lignin, which can better react with other substances. At the same time, the active phenolic hydroxyl groups of phenolic lignin can capture free radicals generated during the aging process and terminate the chain reaction, having good heat resistance, antioxidant and anti-aging effects; tris(hydroxymethyl)aminomethane can tightly combine phenolic lignin and carboxylated graphene to form a lignin-graphene composite, and tris(hydroxymethyl)aminomethane can also significantly increase the binding probability of the phenolic lignin-graphene composite with other components. Adding the lignin-graphene composite to the modified PA fiber in this application can not only improve the anti-aging performance of the PA fiber, but also significantly enhance the mechanical properties of the PA fiber.

[0026] Preferably, the PA tufted recyclable yarn is prepared by the following method:

[0027] By weight, take 80 - 100 parts of modified PA fiber, 5 - 10 parts of cotton fiber, 3 - 8 parts of bamboo fiber. After mixing the modified PA fiber, cotton fiber and bamboo fiber, carry out carding, drawing, roving, spinning, and doubling and twisting to obtain PA yarn; then tuft the PA yarn through a tufting machine to obtain the PA tufted recyclable yarn.

[0028] By adopting the above technical solution, this application selects modified PA fiber, cotton fiber and bamboo fiber for blending and tufting according to a certain weight part to obtain the PA tufted recyclable yarn; the preparation method of the PA tufted recyclable yarn in this application has simple steps and low cost. The obtained PA tufted yarn has excellent wear resistance and anti-aging performance, can be used repeatedly for many times, and has the important value of being recyclable and reusable.

[0029] In the second aspect, this application provides an automotive carpet, adopting the following technical solution:

[0030] An automotive carpet, successively comprising a carpet surface layer, an anti-slip layer and an antibacterial layer, with a hot melt adhesive lining between layers;

[0031] The thickness of the carpet surface layer is 3 - 8 mm, and it is spun from the PA tufted recyclable yarn;

[0032] The thickness of the anti-slip layer is 10 - 15 mm, and it is made of PU foam material;

[0033] The thickness of the antibacterial layer is 10 - 20 μm, and it is made of chitin fiber and carbon fiber;

[0034] The hot melt adhesive lining is copolyester and / or ethylene-vinyl acetate copolymer, and the laying amount of the hot melt adhesive lining is 100 - 200 g / m 2 .

[0035] By adopting the above technical solutions, the automotive carpet of the present application successively comprises a carpet surface layer, an anti-slip layer and an antibacterial layer, with a hot melt adhesive lining between layers; and the carpet surface layer is spun from PA tufted recyclable yarn, which improves the service life of the automotive carpet. At the same time, the automotive carpet can be waterproof, antibacterial and flame-retardant; the anti-slip layer is made of PU foam material, making the automotive carpet have good sound insulation and shock absorption functions; the antibacterial layer is made of chitin fiber and carbon fiber, which can effectively prevent bacteria from growing at the bottom of the automotive carpet; at the same time, the present application also uses copolyester and / or ethylene-vinyl acetate copolymer as the hot melt adhesive lining to bond each layer to form the automotive carpet, making the performance of the automotive carpet more excellent.

[0036] Preferably, the automotive carpet is prepared by the following method:

[0037] Step 1, prepare the carpet surface layer: Take PA tufted recyclable yarn as warp and weft yarns and weave to obtain the carpet surface layer;

[0038] Step 2, prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a hot bonding device to form the automotive carpet; wherein, the speed of the bonding machine is 6 - 10 cm / s, the hot bonding temperature is 120 - 140 °C, the hot bonding time is 60 - 90 s, and the bonding pressure is 0.07 - 0.08 MPa.

[0039] By adopting the above technical solutions, in the preparation process of the automotive carpet of the present application, each process parameter is controlled. First, the carpet surface layer is woven by using PA tufted recyclable yarn; then, the carpet surface layer, the anti-slip layer and the antibacterial layer are bonded by hot bonding to form the automotive carpet; the preparation method of the automotive carpet of the present application has simple steps, is suitable for industrial production, and the obtained automotive carpet has a broad market prospect.

[0040] In summary, the present application has the following beneficial effects:

[0041] 1. The PA tufted recyclable yarn of the present application is composed of modified PA fibers, cotton fibers, and bamboo fibers. The modified PA fibers are composed of raw materials such as PA fibers, lignin-graphene composites, bamboo charcoal powder, kaolin, and waterborne polyurethane, so that the finally obtained PA tufted recyclable yarn has excellent wear resistance and anti-aging properties, and has the environmental protection significance of being recyclable and reusable.

[0042] 2. In the process of preparing the modified PA fibers in the present application, the PA fibers are pretreated. First, they are alkali-washed, then activated with formaldehyde, and finally modified with dodecyldiethanolamine, so that there are a large number of active groups on the surface of the PA fibers, which is conducive to better connection of the PA fibers with other components, and forms a PA tufted recyclable yarn with more excellent performance.

[0043] 3. In the lignin-graphene composite of the present application, lignin and graphene are organically combined, and the two work synergistically, so that the lignin-graphene composite can significantly improve the wear resistance and anti-aging properties of PA fibers.

[0044] 4. The automotive carpet of the present application sequentially includes a carpet surface layer, an anti-slip layer, and an antibacterial layer. The layers are bonded with a hot-melt adhesive lining. The carpet surface layer is spun from the PA tufted recyclable yarn of the present application, and a copolyester and / or ethylene-vinyl acetate copolymer is used as the hot-melt adhesive lining. The preparation method is simple, the preparation cost is low, it is suitable for industrial production, and the obtained automotive carpet has excellent performance and can better meet the high-quality living requirements of people. Detailed Embodiments

[0045] The following further elaborates on the present application in conjunction with embodiments.

[0046] Preparation Examples 1-5 and Comparative Preparation Examples 1-3 provide pretreated PA fibers and their preparation methods.

[0047] Preparation Example 1

[0048] The pretreated PA fibers include the following raw materials:

[0049] 10 kg of PA fibers, 30 kg of 30 wt% sodium hydroxide solution, 10 kg of sodium dihydrogen phosphate, 5 kg of formaldehyde, 1 kg of diethylenetriamine, and 8 kg of dodecyldiethanolamine.

[0050] The pretreated PA fibers are obtained by the following method:

[0051] S11. First, the PA fibers are alkali-impregnated, then filtered. Then, the alkali-treated PA fibers are added to a mixed solution of sodium dihydrogen phosphate and formaldehyde, heated to 50 °C, reacted for 6 h, filtered, washed, and dried to obtain activated PA fibers;

[0052] S12. Disperse the activated PA fibers obtained in step S11 in an acetone solution, stir evenly, add diethylenetriamine and dodecyldiethanolamine, heat up to 70 °C, and react for 10 h to obtain pretreated PA fibers.

[0053] Preparation Example 2

[0054] The pretreated PA fibers include the following raw materials:

[0055] 12 kg of PA fibers, 32 kg of 30 wt% sodium hydroxide solution, 12 kg of sodium dihydrogen phosphate, 6 kg of formaldehyde, 1.5 kg of diethylenetriamine, 9 kg of dodecyldiethanolamine.

[0056] The pretreated PA fibers are prepared by the following method:

[0057] S11. First, immerse the PA fibers in alkali, filter, then add the alkali-treated PA fibers to a mixed solution of sodium dihydrogen phosphate and formaldehyde, heat up to 52 °C, react for 5.5 h, filter, wash, and dry to obtain activated PA fibers;

[0058] S12. Disperse the activated PA fibers obtained in step S11 in an acetone solution, stir evenly, add diethylenetriamine and dodecyldiethanolamine, heat up to 72 °C, and react for 9 h to obtain pretreated PA fibers.

[0059] Preparation Example 3

[0060] The pretreated PA fibers include the following raw materials:

[0061] 15 kg of PA fibers, 35 kg of 30 wt% sodium hydroxide solution, 13 kg of sodium dihydrogen phosphate, 6.5 kg of formaldehyde, 2 kg of diethylenetriamine, 10 kg of dodecyldiethanolamine.

[0062] The pretreated PA fibers are prepared by the following method:

[0063] S11. First, immerse the PA fibers in alkali, filter, then add the alkali-treated PA fibers to a mixed solution of sodium dihydrogen phosphate and formaldehyde, heat up to 55 °C, react for 5 h, filter, wash, and dry to obtain activated PA fibers;

[0064] S12. Disperse the activated PA fibers obtained in step S11 in an acetone solution, stir evenly, add diethylenetriamine and dodecyldiethanolamine, heat up to 75 °C, and react for 8 h to obtain pretreated PA fibers.

[0065] Preparation Example 4

[0066] The pretreated PA fibers include the following raw materials:

[0067] 18 kg of PA fiber, 38 kg of 30 wt% sodium hydroxide solution, 14 kg of sodium dihydrogen phosphate, 7 kg of formaldehyde, 2.5 kg of diethylenetriamine, 11 kg of dodecyldiethanolamine.

[0068] The pretreated PA fiber is prepared by the following method:

[0069] S11. First, the PA fiber is alkali-impregnated, then filtered. Next, the alkali-treated PA fiber is added to the mixed solution of sodium dihydrogen phosphate and formaldehyde, heated to 57 °C, and reacted for 4.5 h. After filtration, washing, and drying, the activated PA fiber is obtained;

[0070] S12. The activated PA fiber obtained in step S11 is dispersed in an acetone solution, stirred evenly, diethylenetriamine and dodecyldiethanolamine are added, heated to 78 °C, and reacted for 7 h to obtain the pretreated PA fiber.

[0071] Preparation Example 5

[0072] The pretreated PA fiber includes the following raw materials:

[0073] 20 kg of PA fiber, 40 kg of 30 wt% sodium hydroxide solution, 15 kg of sodium dihydrogen phosphate, 8 kg of formaldehyde, 3 kg of diethylenetriamine, 12 kg of dodecyldiethanolamine.

[0074] The pretreated PA fiber is prepared by the following method:

[0075] S11. First, the PA fiber is alkali-impregnated, then filtered. Next, the alkali-treated PA fiber is added to the mixed solution of sodium dihydrogen phosphate and formaldehyde, heated to 60 °C, and reacted for 4 h. After filtration, washing, and drying, the activated PA fiber is obtained;

[0076] S12. The activated PA fiber obtained in step S11 is dispersed in an acetone solution, stirred evenly, diethylenetriamine and dodecyldiethanolamine are added, heated to 80 °C, and reacted for 6 h to obtain the pretreated PA fiber.

[0077] Comparative Preparation Example 1

[0078] Comparative Preparation Example 1 is the same as Preparation Example 1, except that: the PA fiber is not alkali-treated.

[0079] Comparative Preparation Example 2

[0080] Comparative Preparation Example 2 is the same as Preparation Example 1, except that: formaldehyde is not added.

[0081] Comparative Preparation Example 3

[0082] Comparative Preparation Example 3 is the same as Preparation Example 1, except that: dodecyldiethanolamine is not added.

[0083] Preparation Examples 6 - 10 are lignin - graphene composites and their preparation methods.

[0084] Preparation Example 6

[0085] The lignin - graphene composite includes the following raw materials:

[0086] 20 kg of lignin, 10 kg of phenol, 2 kg of 80 wt% formic acid solution, 1 kg of trifluoropropionic acid, 30 kg of tris(hydroxymethyl)aminomethane, 20 kg of carboxylated graphene;

[0087] The lignin - graphene composite is prepared by the following method:

[0088] S21. First, add lignin and phenol to trifluoropropionic acid and formic acid solution, mix evenly, react at 80 °C for 60 min, filter, wash, and dry to obtain phenolic lignin;

[0089] S22. Add the phenolic lignin obtained in step S21 to tris(hydroxymethyl)aminomethane, stir at a temperature of 60 °C and a speed of 1800 r / min for 15 min, then add carboxylated graphene, continue to stir for 1 h, filter, and dry to obtain the lignin - graphene composite.

[0090] Preparation Example 7

[0091] The lignin - graphene composite includes the following raw materials:

[0092] 22 kg of lignin, 12 kg of phenol, 3 kg of 82 wt% formic acid solution, 1.5 kg of trifluoropropionic acid, 32 kg of tris(hydroxymethyl)aminomethane, 22 kg of carboxylated graphene;

[0093] The lignin - graphene composite is prepared by the following method:

[0094] S21. First, add lignin and phenol to trifluoropropionic acid and formic acid solution, mix evenly, react at 85 °C for 55 min, filter, wash, and dry to obtain phenolic lignin;

[0095] S22. Add the phenolic lignin obtained in step S21 to tris(hydroxymethyl)aminomethane, stir at a temperature of 63 °C and a speed of 1900 r / min for 12 min, then add carboxylated graphene, continue to stir for 1.2 h, filter, and dry to obtain the lignin - graphene composite.

[0096] Preparation Example 8

[0097] The lignin - graphene composite includes the following raw materials:

[0098] 22 kg of lignin, 11 kg of phenol, 4 kg of 85 wt% formic acid solution, 2 kg of trifluoropropionic acid, 35 kg of tris(hydroxymethyl)aminomethane, 20 - 25 kg of carboxylated graphene;

[0099] The lignin - graphene composite is prepared by the following method:

[0100] S21: First, add lignin and phenol into trifluoropropionic acid and formic acid solution, mix evenly, react at 90 °C for 50 min, filter, wash, and dry to obtain phenolic lignin;

[0101] S22: Add the phenolic lignin obtained in step S21 into tris(hydroxymethyl)aminomethane, stir at a temperature of 65 °C and a speed of 2000 r / min for 10 min, then add carboxylated graphene, continue to stir for 1.5 h, filter, and dry to obtain the lignin - graphene composite.

[0102] Preparation Example 9

[0103] The lignin - graphene composite includes the following raw materials:

[0104] 28 kg of lignin, 14 kg of phenol, 5 kg of 88 wt% formic acid solution, 2.5 kg of trifluoropropionic acid, 38 kg of tris(hydroxymethyl)aminomethane, 24 kg of carboxylated graphene;

[0105] The lignin - graphene composite is prepared by the following method:

[0106] S21: First, add lignin and phenol into trifluoropropionic acid and formic acid solution, mix evenly, react at 95 °C for 45 min, filter, wash, and dry to obtain phenolic lignin;

[0107] S22: Add the phenolic lignin obtained in step S21 into tris(hydroxymethyl)aminomethane, stir at a temperature of 68 °C and a speed of 2100 r / min for 7 min, then add carboxylated graphene, continue to stir for 1.8 h, filter, and dry to obtain the lignin - graphene composite.

[0108] Preparation Example 10

[0109] The lignin - graphene composite includes the following raw materials:

[0110] 30 kg of lignin, 15 kg of phenol, 6 kg of 90 wt% formic acid solution, 3 kg of trifluoropropionic acid, 40 kg of tris(hydroxymethyl)aminomethane, 25 kg of carboxylated graphene;

[0111] The lignin - graphene composite is prepared by the following method:

[0112] S21. First, add lignin and phenol into the trifluoropropionic acid and formic acid solution, mix them evenly, react at 100 °C for 40 min, filter, wash, and dry to obtain phenolic lignin;

[0113] S22. Add the phenolic lignin obtained in step S21 into tris(hydroxymethyl)aminomethane, stir at a temperature of 70 °C and a rotation speed of 2200 r / min for 5 min, then add carboxylated graphene, continue to stir for 2 h, filter, and dry to obtain the lignin-graphene composite.

[0114] Preparation Examples 11-15 are modified PA fibers and their preparation methods.

[0115] Preparation Example 11

[0116] The modified PA fiber comprises the following raw materials: 40 kg of pretreated PA fiber, 10 kg of lignin-graphene composite, 5 kg of bamboo charcoal powder, 2 kg of kaolin, 8 kg of waterborne polyurethane, 1 kg of sophorolipid, 20 kg of N,N-dimethylformamide, 6 kg of silane coupling agent KH550, 10 kg of ethanol, and 30 kg of water;

[0117] Among them, the pretreated PA fiber is Preparation Example 1; the lignin-graphene composite is Preparation Example 6;

[0118] The modified PA fiber is prepared by the following method:

[0119] S1. Add the silane coupling agent KH550 and ethanol into water, ultrasonically disperse, and then stand for hydrolysis for 40 min to obtain an alcoholyzed silane coupling agent solution; at a temperature of 45 °C, add bamboo charcoal powder and kaolin, stir and react at a rotation speed of 800 r / min for 50 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin;

[0120] S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, together with the pretreated PA fiber, lignin-graphene composite, waterborne polyurethane, and sophorolipid, into N,N-dimethylformamide, adjust the pH value to 8, raise the temperature to 60 °C, react for 10 h, then filter and dry to obtain the modified PA fiber.

[0121] Preparation Example 12

[0122] The modified PA fiber comprises the following raw materials: 50 kg of pretreated PA fiber, 12 kg of lignin-graphene composite, 5.2 kg of bamboo charcoal powder, 2.2 kg of kaolin, 8.5 kg of waterborne polyurethane, 1.5 kg of sophorolipid, 22 kg of N,N-dimethylformamide, 6.5 kg of silane coupling agent KH550, 12 kg of ethanol, and 35 kg of water;

[0123] Among them, the pretreated PA fiber is Preparation Example 2; the lignin-graphene composite is Preparation Example 7;

[0124] The modified PA fiber is prepared by the following method:

[0125] S1. Add silane coupling agent KH550 and ethanol into water. After ultrasonic dispersion, let it stand for hydrolysis for 45 min to obtain an alcoholyzed silane coupling agent solution. At a temperature of 47 °C, add bamboo charcoal powder and kaolin, and stir and react at a rotation speed of 850 r / min for 45 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin;

[0126] S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, the pretreated PA fiber, the lignin-graphene composite, waterborne polyurethane, and sophorolipid into N,N-dimethylformamide, adjust the pH value to 8.5, raise the temperature to 65 °C, react for 8 h, then filter and dry to obtain the modified PA fiber.

[0127] Preparation Example 13

[0128] The modified PA fiber comprises the following raw materials: 60 kg of pretreated PA fiber, 15 kg of lignin-graphene composite, 5.5 kg of bamboo charcoal powder, 2.5 kg of kaolin, 9 kg of waterborne polyurethane, 2 kg of sophorolipid, 25 kg of N,N-dimethylformamide, 7 kg of silane coupling agent KH550, 15 kg of ethanol, and 40 kg of water;

[0129] Among them, the pretreated PA fiber is Preparation Example 3; the lignin-graphene composite is Preparation Example 8;

[0130] The modified PA fiber is prepared by the following method:

[0131] S1. Add silane coupling agent KH550 and ethanol into water. After ultrasonic dispersion, let it stand for hydrolysis for 50 min to obtain an alcoholyzed silane coupling agent solution. At a temperature of 48 °C, add bamboo charcoal powder and kaolin, and stir and react at a rotation speed of 900 r / min for 40 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin;

[0132] S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, the pretreated PA fiber, the lignin-graphene composite, waterborne polyurethane, and sophorolipid into N,N-dimethylformamide, adjust the pH value to 9, raise the temperature to 75 °C, react for 7 h, then filter and dry to obtain the modified PA fiber.

[0133] Preparation Example 14

[0134] Modified PA fiber, comprising the following raw materials: 70 kg of pretreated PA fiber, 18 kg of lignin-graphene composite, 5.7 kg of bamboo charcoal powder, 2.8 kg of kaolin, 9.5 kg of waterborne polyurethane, 2.5 kg of sophorolipid, 28 kg of N,N-dimethylformamide, 7.5 kg of silane coupling agent KH550, 18 kg of ethanol, 45 kg of water;

[0135] Among them, the pretreated PA fiber is Preparation Example 4; the lignin-graphene composite is Preparation Example 9;

[0136] The modified PA fiber is prepared by the following method:

[0137] S1. Add the silane coupling agent KH550 and ethanol to water, after ultrasonic dispersion, stand for hydrolysis for 55 min to obtain an alcoholyzed silane coupling agent solution; at a temperature of 49 °C, add bamboo charcoal powder and kaolin, stir and react at a rotation speed of 950 r / min for 35 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin;

[0138] S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, the pretreated PA fiber, the lignin-graphene composite, the waterborne polyurethane, and the sophorolipid to N,N-dimethylformamide, adjust the pH value to 9.5, raise the temperature to 80 °C, react for 6 h, then filter and dry to obtain the modified PA fiber.

[0139] Preparation Example 15

[0140] Modified PA fiber, comprising the following raw materials: 80 kg of pretreated PA fiber, 20 kg of lignin-graphene composite, 6 kg of bamboo charcoal powder, 3 kg of kaolin, 10 kg of waterborne polyurethane, 3 kg of sophorolipid, 30 kg of N,N-dimethylformamide, 8 kg of silane coupling agent KH550, 20 kg of ethanol, 50 kg of water;

[0141] Among them, the pretreated PA fiber is Preparation Example 5; the lignin-graphene composite is Preparation Example 10;

[0142] The modified PA fiber is prepared by the following method:

[0143] S1. Add the silane coupling agent KH550 and ethanol to water, after ultrasonic dispersion, stand for hydrolysis for 60 min to obtain an alcoholyzed silane coupling agent solution; at a temperature of 50 °C, add bamboo charcoal powder and kaolin, stir and react at a rotation speed of 1000 r / min for 30 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin;

[0144] S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, the pretreated PA fiber, lignin-graphene composite, waterborne polyurethane, and sophorolipid into N,N-dimethylformamide, adjust the pH value to 10, raise the temperature to 90 °C, react for 4 h, then filter and dry to obtain the modified PA fiber.

[0145] Comparative Preparation Example 4

[0146] Comparative Preparation Example 4 is the same as Preparation Example 11, except that the pretreated PA fiber is Comparative Preparation Example 1.

[0147] Comparative Preparation Example 5

[0148] Comparative Preparation Example 5 is the same as Preparation Example 11, except that the pretreated PA fiber is Comparative Preparation Example 2.

[0149] Comparative Preparation Example 6

[0150] Comparative Preparation Example 6 is the same as Preparation Example 11, except that the pretreated PA fiber is Comparative Preparation Example 3.

[0151] Comparative Preparation Example 7

[0152] Comparative Preparation Example 7 is the same as Preparation Example 11, except that the PA fiber is not pretreated.

[0153] Comparative Preparation Example 8

[0154] Comparative Preparation Example 8 is the same as Preparation Example 11, except that the lignin-graphene composite is replaced with 20 kg of lignin.

[0155] Comparative Preparation Example 9

[0156] Comparative Preparation Example 9 is the same as Preparation Example 11, except that the lignin-graphene composite is replaced with 20 kg of carboxylated graphene.

[0157] Comparative Preparation Example 10

[0158] Comparative Preparation Example 10 is the same as Preparation Example 11, except that the lignin-graphene composite is replaced with the phenolic lignin prepared in S21 of Preparation Example 6.

[0159] Comparative Preparation Example 11

[0160] Comparative Preparation Example 11 is the same as Preparation Example 11, except that the lignin-graphene composite is replaced with 20 kg of lignin and 20 kg of carboxylated graphene.

[0161] Comparative Preparation Example 12

[0162] Comparative Preparation Example 12 is the same as Preparation Example 11, except that the lignin-graphene composite is not added.

[0163] Comparative Preparation Example 13

[0164] Comparative Preparation Example 13 is the same as Preparation Example 11, except that bamboo charcoal powder is not added.

[0165] Comparative Preparation Example 14

[0166] Comparative Preparation Example 14 is the same as Preparation Example 11, except that kaolin is not added.

[0167] Comparative Preparation Example 15

[0168] Comparative Preparation Example 15 is the same as Preparation Example 11, except that waterborne polyurethane is not added.

[0169] Examples 1-5 provide a PA tufted recyclable yarn.

[0170] Example 1

[0171] A PA tufted recyclable yarn is prepared by the following method:

[0172] Take 80 kg of modified PA fibers, 5 kg of cotton fibers, and 3 kg of bamboo fibers. After mixing the modified PA fibers, cotton fibers, and bamboo fibers, carding, drawing, roving, spinning, and doubling-twisting are carried out to obtain PA yarn; subsequently, the PA yarn is tufted by a tufting machine to obtain a PA tufted recyclable yarn;

[0173] Among them, the modified PA fiber is Preparation Example 11.

[0174] Example 2

[0175] A PA tufted recyclable yarn is prepared by the following method:

[0176] Take 85 kg of modified PA fibers, 6 kg of cotton fibers, and 4 kg of bamboo fibers. After mixing the modified PA fibers, cotton fibers, and bamboo fibers, carding, drawing, roving, spinning, and doubling-twisting are carried out to obtain PA yarn; subsequently, the PA yarn is tufted by a tufting machine to obtain a PA tufted recyclable yarn;

[0177] Among them, the modified PA fiber is Preparation Example 12.

[0178] Example 3

[0179] A PA tufted recyclable yarn is prepared by the following method:

[0180] Take 90 kg of modified PA fiber, 7 kg of cotton fiber, and 6 kg of bamboo fiber. After mixing the modified PA fiber, cotton fiber, and bamboo fiber, carding, drawing, roving, spinning, and doubling-twisting are carried out to obtain PA yarn; subsequently, the PA yarn is tufted by a tufting machine to obtain PA tufted recyclable yarn;

[0181] Among them, the modified PA fiber is Preparation Example 13.

[0182] Example 4

[0183] A kind of PA tufted recyclable yarn is prepared by the following method:

[0184] Take 95 kg of modified PA fiber, 8 kg of cotton fiber, and 7 kg of bamboo fiber. After mixing the modified PA fiber, cotton fiber, and bamboo fiber, carding, drawing, roving, spinning, and doubling-twisting are carried out to obtain PA yarn; subsequently, the PA yarn is tufted by a tufting machine to obtain PA tufted recyclable yarn;

[0185] Among them, the modified PA fiber is Preparation Example 14.

[0186] Example 5

[0187] A kind of PA tufted recyclable yarn is prepared by the following method:

[0188] Take 100 kg of modified PA fiber, 10 kg of cotton fiber, and 8 kg of bamboo fiber. After mixing the modified PA fiber, cotton fiber, and bamboo fiber, carding, drawing, roving, spinning, and doubling-twisting are carried out to obtain PA yarn; subsequently, the PA yarn is tufted by a tufting machine to obtain PA tufted recyclable yarn;

[0189] Among them, the modified PA fiber is Preparation Example 15.

[0190] Examples 6 - 10 provide an automotive carpet.

[0191] Example 6

[0192] An automotive carpet is prepared by the following method:

[0193] Step 1. Prepare the carpet surface layer: Take the PA tufted recyclable yarn as the warp and weft yarns and weave to obtain the carpet surface layer, and the thickness of the carpet surface layer is 3 mm;

[0194] Among them, the PA tufted recyclable yarn is obtained in Example 1;

[0195] Step 2. Prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a hot bonding device to form the automotive carpet. The thickness of the anti-slip layer is 15 mm, the thickness of the antibacterial layer is 10 μm, and the laying amount of the hot melt adhesive lining is 100 g / m 2; wherein, the speed of the bonding machine is 6 cm / s, the thermal bonding temperature is 120 °C, the thermal bonding time is 90 s, and the bonding pressure is 0.07 MPa;

[0196] Among them, the hot melt adhesive lining is obtained by mixing copolyester and ethylene-vinyl acetate copolymer in a mass ratio of 1:1.

[0197] Example 7

[0198] An automotive carpet is prepared by the following method:

[0199] Step 1: Prepare the carpet surface layer: Take PA tufted recyclable yarn as the warp and weft yarns, and weave to obtain the carpet surface layer with a thickness of 4 mm;

[0200] Among them, the PA tufted recyclable yarn is prepared in Example 2;

[0201] Step 2: Prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a thermal bonding device to form the automotive carpet. The thickness of the anti-slip layer is 14 mm, the thickness of the antibacterial layer is 12 μm, and the laying amount of the hot melt adhesive lining is 120 g / m 2 ; wherein, the speed of the bonding machine is 7 cm / s, the thermal bonding temperature is 125 °C, the thermal bonding time is 85 s, and the bonding pressure is 0.075 MPa;

[0202] Among them, the hot melt adhesive lining is obtained by mixing copolyester and ethylene-vinyl acetate copolymer in a mass ratio of 1:1.

[0203] Example 8

[0204] An automotive carpet is prepared by the following method:

[0205] Step 1: Prepare the carpet surface layer: Take PA tufted recyclable yarn as the warp and weft yarns, and weave to obtain the carpet surface layer with a thickness of 5 mm;

[0206] Among them, the PA tufted recyclable yarn is prepared in Example 3;

[0207] Step 2: Prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a thermal bonding device to form the automotive carpet. The thickness of the anti-slip layer is 13 mm, the thickness of the antibacterial layer is 15 μm, and the laying amount of the hot melt adhesive lining is 150 g / m 2 ; wherein, the speed of the bonding machine is 8 cm / s, the thermal bonding temperature is 130 °C, the thermal bonding time is 80 s, and the bonding pressure is 0.075 MPa;

[0208] Among them, the hot melt adhesive lining is obtained by mixing copolyester and ethylene-vinyl acetate copolymer in a mass ratio of 1:1.

[0209] Example 9

[0210] An automotive carpet is prepared by the following method:

[0211] Step 1: Prepare the carpet surface layer: Take PA tufted recyclable yarn as the warp and weft yarns, and weave to obtain the carpet surface layer with a thickness of 7 mm;

[0212] Among them, the PA tufted recyclable yarn is prepared in Example 4;

[0213] Step 2: Prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a hot bonding device to form the automotive carpet. The thickness of the anti-slip layer is 11 mm, the thickness of the antibacterial layer is 18 μm, and the laying amount of the hot melt adhesive lining is 180 g / m 2 ; Among them, the speed of the bonding machine is 9 cm / s, the hot bonding temperature is 135 °C, the hot bonding time is 70 s, and the bonding pressure is 0.075 MPa;

[0214] Among them, the hot melt adhesive lining is obtained by mixing copolyester and ethylene-vinyl acetate copolymer with a mass ratio of 1:1.

[0215] Example 10

[0216] An automotive carpet is prepared by the following method:

[0217] Step 1: Prepare the carpet surface layer: Take PA tufted recyclable yarn as the warp and weft yarns, and weave to obtain the carpet surface layer with a thickness of 8 mm;

[0218] Among them, the PA tufted recyclable yarn is prepared in Example 5;

[0219] Step 2: Prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a hot bonding device to form the automotive carpet. The thickness of the anti-slip layer is 10 mm, the thickness of the antibacterial layer is 20 μm, and the laying amount of the hot melt adhesive lining is 200 g / m 2 ; Among them, the speed of the bonding machine is 10 cm / s, the hot bonding temperature is 140 °C, the hot bonding time is 90 s, and the bonding pressure is 0.08 MPa;

[0220] Among them, the hot melt adhesive lining is obtained by mixing copolyester and ethylene-vinyl acetate copolymer with a mass ratio of 1:1.

[0221] In order to verify the performance of the PA tufted recyclable yarn in Examples 1-5 of this application, the applicant set Comparative Examples 1-14, which are specifically as follows:

[0222] Comparative Example 1

[0223] Comparative Example 1, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 4.

[0224] Comparative Example 2

[0225] Comparative Example 2, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 5.

[0226] Comparative Example 3

[0227] Comparative Example 3, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 6.

[0228] Comparative Example 4

[0229] Comparative Example 4, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 7.

[0230] Comparative Example 5

[0231] Comparative Example 5, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 8.

[0232] Comparative Example 6

[0233] Comparative Example 6, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 9.

[0234] Comparative Example 7

[0235] Comparative Example 7, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 10.

[0236] Comparative Example 8

[0237] Comparative Example 8, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 11.

[0238] Comparative Example 9

[0239] Comparative Example 9, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 12.

[0240] Comparative Example 10

[0241] Comparative Example 10, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 13.

[0242] Comparative Example 11

[0243] Comparative Example 11, same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 14.

[0244] Comparative Example 12

[0245] Comparative Example 12 is the same as Example 1, except that: the modified PA fiber is Comparative Preparation Example 15.

[0246] Comparative Example 13

[0247] Comparative Example 13 is the same as Example 1, except that: PA fiber is used to replace the modified PA fiber.

[0248] Comparative Example 14

[0249] Comparative Example 14 is the same as Example 1, except that: bamboo fiber is not added.

[0250] The properties of the PA tufted recyclable yarns in Examples 1-5 and Comparative Examples 1-14 of the present application were respectively detected. The PA tufted recyclable yarns in Examples 1-5 and Comparative Examples 1-14 were woven into carpet surfaces, and tensile fracture properties, abrasion resistance properties, and anti-aging properties tests were respectively carried out; the following result parameters were obtained, as shown in Table 1 specifically:

[0251] Tensile fracture property: Referring to GB / T3923-1997 "Determination of breaking strength and elongation at break of fabrics - Strip method", the tensile fracture property of the carpet surface fabric was carried out;

[0252] Abrasion resistance property: Take a carpet surface fabric with a diameter of 100 cm, use a disc fabric flat grinding tester to conduct a friction experiment, the weight of the heavy hammer is 500 g, and measure the weight loss rate after 500 rotations of friction;

[0253] Anti-aging property: Place the carpet surface fabric flat in the sample tray of the aging test machine and in a relaxed state. Parameter setting: the temperature is 50 °C, the light intensity is 0.89 W / m 2 , the irradiation time is 300 h, test the change in the tensile fracture property of the carpet surface fabric before and after irradiation, and calculate the strength retention rate.

[0254] Table 1:

[0255]

[0256] It can be seen from the data shown in Table 1 above that: the properties of the carpet surface fabrics made of the PA tufted recyclable yarns in Examples 1-5 of the present application are far superior to those of the carpet surface fabrics made of the PA tufted recyclable yarns in Comparative Examples 1-14. The PA tufted recyclable yarns in Examples 1-5 show excellent mechanical properties, remarkable anti-aging properties, and good abrasion resistance properties, fully indicating that the PA tufted yarn of the present application has excellent comprehensive properties, has the value of recyclability, and can better meet the high-performance requirements of automotive carpets.

[0257] It can be seen from Example 1 and Comparative Examples 1-4 that the modified PA fiber in Example 1 is prepared from Preparation Example 11; the pretreated PA fiber is used in Preparation Example 11, and the pretreated PA fiber is prepared from Preparation Example 1. The PA fiber is first alkali-washed, then activated by formaldehyde, and finally modified by dodecyldiethanolamine. Compared with Comparative Examples 1-4, the comprehensive performance of the PA tufted recyclable yarn prepared in Example 1 is more excellent, indicating that there are a large number of active groups on the surface of the pretreated PA fiber, which is beneficial to the good connection of the PA fiber with other components and optimizes the overall performance of the PA tufted recyclable yarn.

[0258] It can be seen from Example 1 and Comparative Examples 5-9 that the modified PA fiber in Example 1 is prepared from Preparation Example 11; the lignin-graphene composite in Preparation Example 11 is prepared from Preparation Example 6. Compared with Comparative Examples 5-9, the abrasion resistance and aging resistance of the PA tufted recyclable yarn prepared in Example 1 are better, indicating that the lignin-graphene composite of the present application tightly combines lignin and graphene, and the two promote each other, enabling the lignin-graphene composite to significantly improve the wear resistance and anti-aging performance of the PA fiber.

[0259] It can be seen from Example 1 and Comparative Examples 10-12 that the modified PA fiber in Example 1 is prepared from Preparation Example 11, and the raw materials of the modified PA fiber include bamboo charcoal powder, kaolin, and waterborne polyurethane. Compared with Comparative Examples 10-12, the wear resistance and anti-aging performance of the PA tufted recyclable yarn prepared in Example 1 have been greatly improved.

[0260] It can be seen from Example 1 and Comparative Example 13 that the modified PA fiber in Example 1 is prepared from Preparation Example 11. Compared with the unmodified PA fiber used in Comparative Example 13, the comprehensive performance of the PA tufted recyclable yarn prepared in Example 1 is more excellent.

[0261] It can be seen from Example 1 and Comparative Example 14 that the PA tufted recyclable yarn in Example 1 is composed of modified PA fiber and bamboo fiber. Compared with Comparative Example 14 without adding bamboo fiber, the PA tufted recyclable yarn prepared in Example 1 has better tensile fracture performance and abrasion resistance.

[0262] This specific embodiment is only an explanation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A PA tufted recyclable yarn, characterized in that, It is composed of 80 - 100 parts of modified PA fiber, 5 - 10 parts of cotton fiber, and 3 - 8 parts of bamboo fiber; the modified PA fiber includes the following raw materials in parts by weight: 40 - 80 parts of PA fiber, 10 - 20 parts of lignin - graphene composite, 5 - 6 parts of bamboo charcoal powder, 2 - 3 parts of kaolin, 8 - 10 parts of waterborne polyurethane, 1 - 3 parts of sophorolipid, 20 - 30 parts of N,N - dimethylformamide, 6 - 8 parts of silane coupling agent, 10 - 20 parts of ethanol, and 30 - 50 parts of water; The modified PA fiber is prepared by the following method: S1. Add the silane coupling agent and ethanol into water, disperse ultrasonically, and then stand for hydrolysis for 40 - 60 min to obtain an alcohol - hydrolyzed silane coupling agent solution; at a temperature of 45 - 50 °C, add bamboo charcoal powder and kaolin, stir and react at a speed of 800 - 1000 r / min for 30 - 50 min, then filter and dry to obtain modified bamboo charcoal powder and modified kaolin; S2. Add the modified bamboo charcoal powder and modified kaolin obtained in step S1, PA fiber, lignin - graphene composite, waterborne polyurethane, and sophorolipid into N,N - dimethylformamide, adjust the pH value to 8 - 10, raise the temperature to 60 - 90 °C, react for 4 - 10 h, then filter and dry to obtain modified PA fiber; The PA fiber is pretreated, and the specific operation is as follows: S11. First, soak the PA fiber in alkali, filter, then add the alkali - treated PA fiber into a mixed solution of sodium dihydrogen phosphate and formaldehyde, raise the temperature to 50 - 60 °C, react for 4 - 6 h, filter, wash, and dry to obtain activated PA fiber; S12. Disperse the activated PA fiber obtained in step S11 in an acetone solution, stir evenly, add diethylenetriamine and dodecyldiethanolamine, raise the temperature to 70 - 80 °C, react for 6 - 10 h to obtain pretreated PA fiber; The lignin - graphene composite is prepared by the following method: S21. First, add lignin and phenol into a solution of trifluoropropionic acid and formic acid, mix evenly, react at 80 - 100 °C for 40 - 60 min, filter, wash, and dry to obtain phenolic lignin; S22. Add the phenolic lignin obtained in step S21 into tris - (hydroxymethyl) aminomethane, stir at a temperature of 60 - 70 °C at a speed of 1800 - 2200 r / min for 5 - 15 min, then add carboxylated graphene, continue to stir for 1 - 2 h, then filter and dry to obtain lignin - graphene composite.

2. The PA tufted recyclable yarn according to claim 1, characterized in that, The pretreated PA fiber includes the following raw materials in parts by weight: 10 - 20 parts of PA fiber, 30 - 40 parts of 30 wt% sodium hydroxide solution, 10 - 15 parts of sodium dihydrogen phosphate, 5 - 8 parts of formaldehyde, 1 - 3 parts of diethylenetriamine, and 8 - 12 parts of dodecyldiethanolamine.

3. The PA tufted recyclable yarn according to claim 1, characterized in that, The lignin - graphene composite includes the following raw materials in parts by weight: 20 - 30 parts of lignin, 10 - 15 parts of phenol, 2 - 6 parts of 80 - 90 wt% formic acid solution, 1 - 3 parts of trifluoropropionic acid, 30 - 40 parts of tris - (hydroxymethyl) aminomethane, and 20 - 25 parts of carboxylated graphene.

4. The PA tufted recyclable yarn according to claim 1, characterized in that, The PA tufted recyclable yarn is prepared by the following method: By weight parts, take 80 - 100 parts of modified PA fiber, 5 - 10 parts of cotton fiber, 3 - 8 parts of bamboo fiber, After mixing modified PA fibers, cotton fibers, and bamboo fibers, perform Carding, drawing, roving, spinning, and ply twisting to obtain PA yarn ; Subsequently, through The tufting machine for PA yarn Perform tufting , obtain PA tufted recyclable yarns.

5. An automotive carpet, characterized in that, Sequentially includes a carpet surface layer, an anti-slip layer, and an antibacterial layer, and there is a hot melt adhesive lining between layers; The thickness of the carpet surface layer is 3 - 8 mm, and it is spun from the PA tufted recyclable yarn according to any one of claims 1 - 4; The thickness of the anti-slip layer is 10 - 15 mm, and it is made of PU foam material; The thickness of the antibacterial layer is 10 - 20 μm, and it is made of chitin fiber and carbon fiber; The hot melt adhesive interlining is a copolyester and / or ethylene-vinyl acetate copolymer, and the laying amount of the hot melt adhesive interlining is 100-200 g / m 2 .

6. The automotive carpet according to claim 5, wherein The automotive carpet is obtained by the following method: Step 1, prepare the carpet surface layer: Take the PA tufted recyclable yarn as the warp and weft yarns, and weave to obtain the carpet surface layer; Step 2, prepare the automotive carpet: Place the hot melt adhesive lining between the carpet surface layer and the anti-slip layer and between the anti-slip layer and the antibacterial layer, and perform thermo-compounding in a thermal bonding device to form the automotive carpet; wherein, the speed of the bonding machine is 6 - 10 cm / s, the thermal bonding temperature is 120 - 140 °C, the thermal bonding time is 60 - 90 s, and the bonding pressure is 0.07 - 0.08 MPa.

Images