High color fastness and washing-resistant nylon fabric and preparation method thereof

Abstract

This invention relates to the field of textile dyeing and finishing technology, specifically disclosing a high color fastness and wash-resistant nylon fabric and its preparation method. The high color fastness and wash-resistant nylon fabric is woven from high color fastness nylon solution-dyed yarn and modified spandex yarn, and the surface of the nylon fabric fibers is grafted with a cross-linked polymer layer. The cross-linked polymer layer is formed by impregnation and baking with a functional finishing liquid. The high color fastness nylon solution-dyed yarn includes raw materials: polyamide 6 chips, carbon black, dispersant, compatibilizer, and nucleating agent. This invention, through the synergistic modification of nylon yarn and spandex yarn, combined with durable functional surface finishing, produces a nylon fabric that, while ensuring basic fabric performance, also possesses excellent rubbing resistance, soap wash fastness, and long-lasting water resistance.

Description

Technical Field

[0001] This invention relates to the field of textile dyeing and finishing technology, specifically to a nylon fabric with high color fastness and washability and its preparation method. Background Technology

[0002] Nylon, or polyamide fiber, possesses high strength, good elasticity, and excellent abrasion resistance, making it a crucial raw material for clothing, home textiles, and industrial textiles. In the apparel sector, textiles must withstand repeated washing and mechanical friction. Conventional nylon fabrics undergo dyeing and finishing processes. After repeated detergent and physical washing, dye molecules are prone to migration or shedding, inevitably leading to color fading, localized whitening, and other color fastness degradation. Currently, the mainstream industry solution to color fading during washing is to increase the amount of fixing agent used to improve fabric color fastness; however, this not only significantly increases dye and chemical costs and wastewater treatment pressure but also causes the fabric to become stiff, reducing wearing comfort.

[0003] To avoid the environmental and cost issues caused by post-dyeing, solution dyeing technology (i.e., blending and melting the colorant with the fiber raw material before spinning) has been gradually applied. This technology eliminates the dyeing step, improving the uniformity of coloring from the source. However, existing nylon solution-dyed fibers tend to accumulate significant residual internal stress during the forming process, leading to stress release during heat treatment or washing of the final fabric. This results in severe heat shrinkage and dimensional shrinkage after washing, reducing the fabric's wash resistance and shape stability. Furthermore, for nylon elastic fabrics containing elastic fibers such as spandex, different fibers have varying adhesion to the hydrophobic functional layer. Coordinating the properties of different fibers to achieve a consistent high color fastness and durability of the overall fabric after repeated washing remains a significant technical challenge.

[0004] In summary, existing technologies struggle to achieve sustained high colorfastness, excellent dimensional stability after washing, and stain and water repellency in nylon fabrics while ensuring their basic wearability. Based on the above, this invention proposes a nylon fabric with high colorfastness and washability, and its preparation method. Summary of the Invention

[0005] To address the challenges of existing technologies in achieving durable and consistent high colorfastness in nylon fabrics while ensuring basic fabric performance, and to overcome technical issues such as easy shrinkage after washing in solution-dyed fabrics, this invention proposes a high colorfastness and wash-resistant nylon fabric and its preparation method.

[0006] In a first aspect, the present invention provides a nylon fabric with high color fastness and water resistance, using the following technical solution: A high color fastness and washability nylon fabric, wherein the nylon fabric is woven from high color fastness nylon solution dyed yarn and modified spandex yarn, wherein the mass ratio of high color fastness nylon solution dyed yarn to modified spandex yarn is 92-97:3-8, and the surface of the nylon fabric fibers is grafted with a cross-linked polymer layer. The high color fastness nylon solution-dyed yarn comprises the following raw materials in parts by weight: 80-100 parts of polyamide 6 chips, 2-3 parts of carbon black, 0.5-1.5 parts of dispersant, 1-3 parts of compatibilizer, and 0.1-0.5 parts of nucleating agent.

[0007] Preferably, the modified spandex filament is a spandex filament whose surface has been treated with silane coupling agent graft polymerization and crosslinking modification.

[0008] Preferably, the method for preparing the modified spandex filament includes the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 50-100W, and the treatment time at 30-60s to obtain activated spandex filament; S2. Dissolve 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, and azobisisobutyronitrile in an alcohol solvent to obtain a grafting solution; immerse the activated spandex filament in the grafting solution for 15-20 seconds, perform one dip and one roll, with a roll-off rate of 60-80%, and then treat it at 120-130℃ for 3-5 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with an alkaline aqueous solution within 1-3 seconds, and then treated at 150-160℃ for 2-3 minutes to obtain cross-linked modified spandex yarn; S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment at 75-80℃ for 30-60 minutes, and then wound up to obtain the modified spandex yarn.

[0009] Preferably, in step S2, the mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and alcohol solvent is 1:0.8-1.2:0.08-0.15:30-40.

[0010] Preferably, the alcohol solvent in step S2 is propanol.

[0011] Preferably, the alkaline aqueous solution in step S3 is an ammonia solution with a mass fraction of 0.5-1%.

[0012] Preferably, the cross-linked polymer layer is formed by impregnation and baking of the nylon fiber surface with a functional finishing liquid.

[0013] Preferably, the preparation method of the functional finishing liquid includes the following steps: (1) Add polyethylene glycol diacrylate, glycidyl methacrylate and nonionic emulsifier to deionized water in sequence, and shear and disperse for 20-30 min to obtain monomer microemulsion; (2) While stirring, add potassium persulfate to the monomer microemulsion and continue stirring for 10-20 min. Adjust the pH of the system to 5.0-6.0 with organic acid to obtain a mixture. (3) Place the mixture in a homogenizer and homogenize it 3-5 times at a pressure of 35-40 MPa, with an interval of 5-10 minutes between each time. Then add deionized water to adjust the solid content of the system to 30-50% to obtain the functional finishing solution.

[0014] Preferably, in step (1), the mass ratio of polyethylene glycol diacrylate, glycidyl methacrylate, nonionic emulsifier and deionized water is 1:0.8-1.2:0.5-1.5:6-10.

[0015] Preferably, the shearing speed in step (1) is 8000-12000 rpm.

[0016] Preferably, the stirring rate in step (2) is 150-300 rpm.

[0017] Preferably, in step (2), the mass ratio of monomer microemulsion to potassium persulfate is 1.5-2.5:0.05-0.1.

[0018] Preferably, the dispersant in the high color fastness nylon solution-dyed yarn is a mixture of stearic acid and hydroxyl-terminated hyperbranched polyester.

[0019] Preferably, the dispersant in the high color fastness nylon solution-dyed yarn is stearic acid and hydroxyl-terminated hyperbranched polyester in a mass ratio of 0.8-1.2:1.

[0020] Preferably, the dispersant in the high color fastness nylon solution-dyed yarn is stearic acid and hydroxyl-terminated hyperbranched polyester in a mass ratio of 1:1.

[0021] Preferably, the compatibilizer in the high color fastness nylon dope yarn is maleic anhydride-grafted polypropylene or maleic anhydride-grafted ethylene-octene copolymer.

[0022] Preferably, the nucleating agent in the high color fastness nylon solution-dyed yarn is sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate or basic aluminum 2,2'-methylene-bis(4,6-di-tert-butylphenyl) phosphate.

[0023] Secondly, the present invention provides a method for preparing a nylon fabric with high color fastness and washability, using the following technical solution: A method for preparing a nylon fabric with high color fastness and washability includes the following steps: Step 1: By weight, place polyamide 6 chips, carbon black, dispersant, compatibilizer and nucleating agent in a mixer and mix at 50-70℃ for 10-20 minutes to obtain a premix; place the premix in an extruder, and after melt blending, extrusion, cooling, pelletizing and drying, obtain functional black masterbatch; Step 2: After vacuum drying of polyamide 6 chips, they are mixed with functional black masterbatch and placed in an extruder. After melt spinning, they enter a slow cooling zone at 180-200℃, and then sequentially pass through side blowing cooling, oiling, pre-stretching of the first guide roller, main stretching of the hot roller, networking and winding to obtain high color fastness nylon dope yarn. Step 3: Using a mechanical coating process, high color fastness nylon solution-dyed yarn is used as the outer fiber and modified spandex yarn is used as the core yarn to coat the yarn and obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarns are used as warp and weft yarns and woven on a loom to obtain the grey fabric; Step 5: The greige fabric is subjected to pre-setting, hot water washing, padding and baking with functional finishing solution, and final setting and curing to obtain a nylon fabric with high color fastness and water resistance.

[0024] Preferably, the mixing rate in step 1 is 400-600 rpm.

[0025] Preferably, in step 1, the screw speed of the extruder is 200-250 rpm, and the temperature is set as follows: Zone 1 220-230℃, Zone 2 234-240℃, Zone 3 235-245℃, Zone 4 235-245℃, and Die head 235-245℃.

[0026] Preferably, the drying in step 1 refers to drying at 80-90℃ and a vacuum of -0.08MPa for 6-8 hours.

[0027] Preferably, the vacuum drying in step 2 refers to drying at 100-120℃ and a vacuum of -0.09MPa for 10-12 hours.

[0028] Preferably, in step 2, the screw speed of the extruder is 20-40 rpm, and the temperature is set as follows: Zone 1 240-250℃, Zone 2 250-260℃, Zone 3 260-265℃, and Die head 255-260℃.

[0029] Preferably, in step 2, the side-blowing temperature is 20-25℃; and the oiling rate is 0.8-1.2%.

[0030] Preferably, the stretching speed of the first guide roller in step 2 is 900-1200 m / min.

[0031] Preferably, in step 2, the stretching speed of the hot roller is 3800-4500 m / min, the temperature is 140-155℃, and the stretching ratio is 3.5-4.2 times.

[0032] Preferably, the air pressure of the network in step 2 is 0.25-0.35 MPa.

[0033] Preferably, in step 2, the monofilament fineness of the high color fastness nylon solution-dyed yarn is 65-75 denier and the ply number is 40-60.

[0034] Preferably, in step 2, the high color fastness nylon solution-dyed yarn has a single filament fineness of 70 denier and a ply count of 48.

[0035] Preferably, in step 4, the loom is equipped with an 8-page heald frame, and the process parameters are: loom tension 3200-3500N, machine speed 480-520r / min, shedding time 305°-310°, back beam height 60-80mm, warp density 130-140 ends / inch, weft density 100-110 ends / inch, and 2 ends per reed in the ground weave.

[0036] Preferably, the pre-forming in step 5 refers to pre-forming the fabric on a setting machine under the following conditions: temperature 185-195℃, machine speed 35-45m / min, and overfeed 8-12%.

[0037] Preferably, the hot water washing in step 5 refers to treating the nylon fabric in hot water at 80-85℃ for 25-35 minutes to remove impurities.

[0038] Preferably, the padding and baking of the functional finishing liquid in step 5 refers to immersing the washed nylon fabric in the functional finishing liquid (with a padding rate of 60-80%) at room temperature and at a speed of 20-30 m / min, and then baking it at 100-120℃ for 1-2 min.

[0039] Preferably, in step 5, final setting and curing refers to setting the final shape for 1.5-2.5 minutes at 155-165℃, a vehicle speed of 35-45m / min, and an overfeed of 6-10%.

[0040] In summary, the present invention has the following beneficial effects: 1. This invention employs a solution dyeing process, where pigments (carbon black) and fiber raw materials are blended in a molten state, eliminating the need for printing and dyeing processes and the use of corresponding dyes and chemicals. By using stearic acid and terminal hydroxyl hyperbranched polyester as a dispersant, the dispersion uniformity of carbon black in the nylon matrix is ​​improved, reducing uneven coloring caused by pigment agglomeration.

[0041] 2. The functional finishing liquid in this invention forms a cross-linked polymer layer in situ on the surface of nylon fibers through padding and baking. During the baking process, the initiator potassium persulfate initiates the polymerization of acrylate double bonds in the system to form a cross-linked network; simultaneously, the epoxy groups on glycidyl methacrylate undergo ring-opening under high-temperature baking, reacting with amino or amide groups on the surface of the nylon fibers to form covalent bonds. This structure can encapsulate pigment molecules, increase the hydrophobicity of the fabric, hinder detergent penetration and pigment migration, and improve the fabric's wash fastness and rubbing fastness.

[0042] 3. This invention modifies spandex yarn by surface grafting and crosslinking, resulting in a hydrophobic crosslinked layer on the surface of the modified spandex yarn. This crosslinked layer reduces the affinity of the spandex core yarn for water and dye molecules, restricts the migration of outer dyes into the core yarn, and alleviates the whitening phenomenon after washing of elastic fabrics; the hydrophobic crosslinked core yarn and the outer hydrophobic polymer layer work together to improve the overall durability of the fabric's wash resistance.

[0043] 4. This invention utilizes heat treatment to set the yarn, employing high-temperature overfeeding for pre-setting and appropriate-temperature final setting. Combined with the physical constraints of the surface cross-linked network, this releases and redistributes the internal stress of the polymer chains accumulated during the formation of solution-dyed yarn. This improves the shrinkage and deformation of solution-dyed fabrics during heating and washing, and enhances dimensional stability.

[0044] 5. This invention overcomes the inherent technical conflicts that exist when solution dyeing, spandex surface modification, and fabric coating are combined. The three elements form a highly coupled synergistic effect, producing unexpected technical results. It is generally believed in the art that solution dyeing solves the dyeing problem, and coating solves the waterproofing problem. However, in high-elasticity nylon interwoven fabrics, due to the significant difference in surface energy between spandex and nylon, conventional coatings are difficult to form a continuous film; moreover, spandex easily absorbs water and swells during washing, which can break through the surface coating from the inside out; in addition, the surface density of solution-dyed fibers decreases, and free pigments are easily detached under mechanical friction. This invention breaks through the limitations of conventional physical superposition techniques, constructing a dual protective fortress of a hydrophobically modified core filament (inner) and a covalently grafted coating (outer). The coating not only repels water externally, but its epoxy groups also covalently anchor to the nylon surface through ring-opening reactions, firmly locking in the solution-dyed pigments; while the silane crosslinking modification of the inner core filament completely cuts off the path of water penetration leading to swelling and damage, providing solid physical support for the outer coating. The three elements stimulate each other in terms of microscopic mechanism and macroscopic performance, achieving long-lasting washability, high abrasion resistance and excellent dimensional stability that cannot be achieved by a single technical feature. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the embodiments.

[0046] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0047] The key raw materials used in this invention are sourced from the following sources: Polyamide 6 chips: Item No. 000188, purchased from Shanghai Juyifa Engineering Plastics Co., Ltd.; Spandex yarn: fineness 40D, manufacturer is DuPont Japan, purchased from Zhuji Haoting Chemical Fiber Yarn Business Department; Carbon black: Model N330, purchased from Guangzhou Yinuo Chemical Technology Co., Ltd.; Stearic acid: Model 1801, iodine value 0.14gI2 / 100g, acid value 209mgKOH / g, freezing point 55℃, purchased from Qingdao Shengying Innovation Materials Co., Ltd. Hydroxyl-terminated hyperbranched polyester: Model HyPerH202, hydroxyl value 520mgKOH / g, theoretical molecular weight 1200g / mol, purchased from Wuhan Hyperbranched Resin Technology Co., Ltd. Maleic anhydride-grafted polypropylene: Grade B1A, purchased from KOS Chemical Co., Ltd. Sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate: CAS No. 85209-91-2, purchased from Hubei Jianchu Biomedical Co., Ltd.; 3-(methacryloyloxy)propyltrimethoxysilane: model JST, purchased from Shandong Jinshengtai Chemical Co., Ltd.; 2-Hydroxyethyl methacrylate: CAS No. 868-77-9, purchased from Hubei Weistin Technology Co., Ltd.; Azobisisobutyronitrile: CAS No. 78-67-1, purchased from Shandong Feihong New Materials Co., Ltd.; Polyethylene glycol diacrylate: Product number P131592-2.5L, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; Glycidyl methacrylate: CAS No. 106-91-2, purchased from Shandong Jiaxu Chemical Co., Ltd.; Potassium persulfate: CAS No. 7727-21-1, purchased from Shandong Huian Chemical Co., Ltd.

[0048] Nonionic emulsifier: Model OP-10, purchased from Haian Petrochemical Plant, Jiangsu Province; Preparation Examples 1-3 and Comparative Preparation Examples 1-2 provide a method for preparing modified spandex yarn.

[0049] Preparation Example 1 Modified spandex yarn is prepared by the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 50W, and the treatment time at 60s to obtain activated spandex filament; S2. The mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and propanol was controlled at 1:0.8:0.08:30. 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, and azobisisobutyronitrile were dissolved in propanol to obtain a grafting solution. The activated spandex filament was immersed in the grafting solution for 15 seconds, followed by one dip and one roll, with a roll-off rate of 60%. Then, it was placed in a 120℃ hot air oven for 5 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with a 0.5% (w / w) ammonia solution within 1 second, and then transferred to a 150℃ high-temperature oven for 3 minutes to obtain cross-linked modified spandex yarn; S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment in an oven at 75℃ for 60 minutes, and then wound up to obtain the modified spandex yarn.

[0050] Preparation Example 2 Modified spandex yarn is prepared by the following steps: S1. The spandex filament is placed in a low-temperature plasma treatment device under an argon atmosphere, with a power of 75W and a treatment time of 45s, to obtain activated spandex filament; S2. The mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and propanol was controlled at 1:1.0:0.12:35. 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, and azobisisobutyronitrile were dissolved in propanol to obtain a grafting solution. The activated spandex filament was immersed in the grafting solution for 17 seconds, followed by one dip and one roll, with a roll-off rate of 70%. Subsequently, it was placed in a 125℃ hot air oven for 4 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with a 0.8% (w / w) ammonia solution within 2 seconds, and then transferred to a 155℃ high-temperature oven for 2.5 min to obtain cross-linked modified spandex yarn; S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment in an oven at 78°C for 45 minutes, and then wound up to obtain the modified spandex yarn.

[0051] Preparation Example 3 Modified spandex yarn is prepared by the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 100W, and the treatment time at 30s to obtain activated spandex filament; S2. The mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and propanol was controlled at 1:1.2:0.15:40. 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, and azobisisobutyronitrile were dissolved in propanol to obtain a grafting solution. The activated spandex filament was immersed in the grafting solution for 20 seconds, followed by one dip and one roll, with a roll-off rate of 80%. Then, it was placed in a 130℃ hot air oven for 3 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with a 1% (w / w) ammonia solution within 3 seconds, and then transferred to a 160℃ high-temperature oven for 2 minutes to obtain cross-linked modified spandex yarn. S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment in an 80℃ oven for 30 minutes, and then wound up to obtain the modified spandex yarn.

[0052] Comparative Preparation Example 1 Modified spandex yarn is prepared by the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 50W, and the treatment time at 60s to obtain activated spandex filament; S2. The mass ratio of 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and propanol was controlled at 1.8:0.08:30. 2-hydroxyethyl methacrylate and azobisisobutyronitrile were dissolved in propanol to obtain a grafting solution. The activated spandex filament was immersed in the grafting solution for 15 seconds, followed by one dip and one roll, with a roll-off rate of 60%. Then, it was placed in a 120℃ hot air oven for 5 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with a 0.5% (w / w) ammonia solution within 1 second, and then transferred to a 150℃ high-temperature oven for 3 minutes to obtain cross-linked modified spandex yarn; S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment in an oven at 75℃ for 60 minutes, and then wound up to obtain the modified spandex yarn.

[0053] Comparative Preparation Example 2 Modified spandex yarn is prepared by the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 50W, and the treatment time at 60s to obtain activated spandex filament; S2. The mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, azobisisobutyronitrile, and propanol was controlled at 1.8:0.08:30. 3-(methacryloyloxy)propyltrimethoxysilane and azobisisobutyronitrile were dissolved in propanol to obtain a grafting solution. The activated spandex filament was immersed in the grafting solution for 15 seconds, followed by one dip and one roll, with a roll-off rate of 60%. Then, it was placed in a 120℃ hot air oven for 5 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with a 0.5% (w / w) ammonia solution within 1 second, and then transferred to a 150℃ high-temperature oven for 3 minutes to obtain cross-linked modified spandex yarn; S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment in an oven at 75℃ for 60 minutes, and then wound up to obtain the modified spandex yarn.

[0054] Comparative preparation example 3 Modified spandex yarn is prepared by the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 50W, and the treatment time at 60s to obtain activated spandex filament; S2. The mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and propanol was controlled at 1:0.8:0.08:30. 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, and azobisisobutyronitrile were dissolved in propanol to obtain a grafting solution. The activated spandex filament was immersed in the grafting solution for 15 seconds, followed by one dip and one roll, with a roll-off rate of 60%. Then, it was placed in a 120℃ hot air oven for 5 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is treated with deionized water within 1 second, and then transferred to a high temperature oven at 150℃ for 3 minutes to obtain non-catalytic spandex yarn. S4. The non-catalytic spandex yarn is subjected to heat relaxation treatment in an oven at 75°C for 60 minutes, and then wound up to obtain relaxed non-catalytic spandex yarn.

[0055] Preparation Examples 4-6 and Comparative Preparation Example 4-5 provide methods for preparing interface modifiers.

[0056] Preparation Example 4 The modified finishing solution is prepared by the following steps: (1) Control the mass ratio of polyethylene glycol diacrylate, glycidyl methacrylate, nonionic emulsifier OP-10 and deionized water to 1:0.8:0.5:6. Add polyethylene glycol diacrylate, glycidyl methacrylate and nonionic emulsifier OP-10 to deionized water in sequence. Use a high-speed shear emulsifier to shear and disperse at a rate of 8000 rpm for 30 min to obtain monomer microemulsion. (2) Control the mass ratio of monomer microemulsion and potassium persulfate to 1.5:0.05. Add potassium persulfate to monomer microemulsion at a stirring speed of 150 rpm, continue stirring and mixing for 10 min, and adjust the pH of the system to 5.0 with glacial acetic acid to obtain a mixture. (3) Place the mixture in a homogenizer and homogenize it three times at a pressure of 35 MPa, with a 5-minute interval between each time. Then add deionized water to adjust the solid content of the system to 30% to obtain the functional finishing solution.

[0057] Preparation Example 5 The modified finishing solution is prepared by the following steps: (1) Control the mass ratio of polyethylene glycol diacrylate, glycidyl methacrylate, nonionic emulsifier OP-10 and deionized water to 1:1.0:1.2:8. Add polyethylene glycol diacrylate, glycidyl methacrylate and nonionic emulsifier OP-10 to deionized water in sequence. Use a high-speed shear emulsifier to shear and disperse at a rate of 10,000 rpm for 25 min to obtain monomer microemulsion. (2) Control the mass ratio of monomer microemulsion and potassium persulfate to 2:0.08. Add potassium persulfate to monomer microemulsion at a stirring speed of 200 rpm, continue stirring and mixing for 15 min, and adjust the pH of the system to 5.5 with glacial acetic acid to obtain the mixture. (3) Place the mixture in a homogenizer and homogenize it 3-5 times at a pressure of 38 MPa, with an interval of 7 minutes between each time. Then add deionized water to adjust the solid content of the system to 40% to obtain the functional finishing solution.

[0058] Preparation Example 6 The modified finishing solution is prepared by the following steps: (1) Control the mass ratio of polyethylene glycol diacrylate, glycidyl methacrylate, nonionic emulsifier OP-10 and deionized water to 1:1.2:1.5:10. Add polyethylene glycol diacrylate, glycidyl methacrylate and nonionic emulsifier OP-10 to deionized water in sequence. Use a high-speed shear emulsifier to shear and disperse at a rate of 12000 rpm for 20 min to obtain monomer microemulsion. (2) Control the mass ratio of monomer microemulsion and potassium persulfate to 2.5:0.1. Add potassium persulfate to the monomer microemulsion at a stirring speed of 300 rpm and continue stirring and mixing for 20 min. Adjust the pH of the system to 6.0 with glacial acetic acid to obtain the mixture. (3) Place the mixture in a homogenizer and homogenize it 5 times at a pressure of 40 MPa, with an interval of 10 min between each time. Then add deionized water to adjust the solid content of the system to 50% to obtain the functional finishing solution.

[0059] Comparative preparation example 4 (1) Control the mass ratio of glycidyl methacrylate, nonionic emulsifier OP-10 and deionized water to 1.8:0.5:6. Add glycidyl methacrylate and nonionic emulsifier OP-10 to deionized water in sequence, and use a high-speed shear emulsifier to shear and disperse at a rate of 8000 rpm for 30 min to obtain monomer microemulsion. (2) Control the mass ratio of monomer microemulsion and potassium persulfate to 1.5:0.05. Add potassium persulfate to monomer microemulsion at a stirring speed of 150 rpm, continue stirring and mixing for 10 min, and adjust the pH of the system to 5.0 with glacial acetic acid to obtain a mixture. (3) Place the mixture in a homogenizer and homogenize it three times at a pressure of 35 MPa, with a 5-minute interval between each time. Then add deionized water to adjust the solid content of the system to 30% to obtain the functional finishing solution.

[0060] Comparative preparation example 5 (1) Control the mass ratio of polyethylene glycol diacrylate, nonionic emulsifier OP-10 and deionized water to 1.8:0.5:6. Add polyethylene glycol diacrylate and nonionic emulsifier OP-10 to deionized water in sequence. Use a high-speed shear emulsifier to shear and disperse at a rate of 8000 rpm for 30 min to obtain monomer microemulsion. (2) Control the mass ratio of monomer microemulsion and potassium persulfate to 1.5:0.05. Add potassium persulfate to monomer microemulsion at a stirring speed of 150 rpm, continue stirring and mixing for 10 min, and adjust the pH of the system to 5.0 with glacial acetic acid to obtain a mixture. (3) Place the mixture in a homogenizer and homogenize it three times at a pressure of 35 MPa, with a 5-minute interval between each time. Then add deionized water to adjust the solid content of the system to 30% to obtain the functional finishing solution.

[0061] Examples 1-3 provide a nylon fabric with high color fastness and water resistance, and a method for preparing the same. Example 1

[0062] A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core yarn to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance. Example 2

[0063] A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 90 parts of polyamide 6 chips, 2.5 parts of carbon black, 1.2 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 2 parts of maleic anhydride-grafted polypropylene, and 0.3 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 60°C and 500 rpm for 15 minutes to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 230 rpm and the following temperatures set: Zone 1 225°C, Zone 2 238°C, Zone 3 240°C, Zone 4 240°C, and Die Head 240°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 85°C and a vacuum of -0.08 MPa for 7 hours to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 110℃ and vacuum degree -0.09MPa for 11h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 30rpm, and the temperature is set as follows: Zone 1 245℃, Zone 2 255℃, Zone 3 263℃, and Die head 258℃. After melt spinning, the yarn enters the 190℃ slow cooling zone, and then sequentially undergoes 23℃ side blowing cooling, oiling (oiling rate 1.0%), pre-stretching at 1000m / min on the first guide roller, main stretching on the hot roller (stretching temperature 150℃, speed 4000m / min, stretching ratio 3.8 times), networking (air pressure 0.28MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 2) to 94:6, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core fiber to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3300N, machine speed 500r / min, shedding time 308°, back beam height 70mm, warp density 135 threads / inch, weft density 105 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 190℃, speed 40m / min, overfeed 10%), it is treated in hot water at 83℃ for 30 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 5, with a padded rate of 70%) at room temperature at a speed of 25 m / min, and then baked at 110°C for 1.5 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is final set for 2 minutes at 160℃, machine speed of 40m / min and overfeed of 8% to obtain a high color fastness and washable nylon fabric. Example 3

[0064] A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 100 parts of polyamide 6 chips, 3 parts of carbon black, 1.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 3 parts of maleic anhydride-grafted polypropylene, and 0.5 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 70°C and 600 rpm for 10 minutes to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 250 rpm and the following temperatures set: Zone 1 230°C, Zone 2 240°C, Zone 3 245°C, Zone 4 245°C, and Die Head 245°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 90°C and a vacuum of -0.08 MPa for 6 hours to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 120℃ and vacuum degree -0.09MPa for 10h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 40rpm, and the temperature is set as follows: Zone 1 250℃, Zone 2 260℃, Zone 3 265℃, and Die head 260℃. After melt spinning, the yarn enters the 200℃ slow cooling zone, and then sequentially undergoes 25℃ side blowing cooling, oiling (oiling rate 1.2%), pre-stretching at 1200m / min on the first guide roller, main stretching on the hot roller (stretching temperature 155℃, speed 4500m / min, stretching ratio 4.2 times), networking (air pressure 0.35MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 3) to 97:3, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core fiber to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3500N, machine speed 520r / min, shedding time 310°, back beam height 80mm, warp density 140 threads / inch, weft density 110 threads / inch, and 2 threads are inserted per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 195℃, speed 45m / min, overfeed 12%), it is treated in hot water at 85℃ for 25 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 6, with a padded rate of 80%) at room temperature at a speed of 30 m / min, and then baked at 120°C for 1 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 1.5 minutes at 165℃, machine speed of 45m / min and overfeed of 10% to obtain a nylon fabric with high color fastness and water resistance.

[0065] To verify the comprehensive performance of the high colorfastness and wash-resistant nylon fabric provided by the present invention, comparative examples 1-5 were set up, wherein: Comparative Example 1 Comparative Example 1 is the same as Example 1, except that the modified spandex filament obtained in Preparation Example 1 is replaced with that obtained in Comparative Preparation Example 1. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Comparative Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core fiber to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0066] Comparative Example 2 Comparative Example 2 is the same as Example 1, except that the modified spandex filament obtained in Preparation Example 1 is replaced with that obtained in Comparative Preparation Example 2. Specifically: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from comparative preparation example 2) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core fiber to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0067] Comparative Example 3 Comparative Example 3 is the same as Example 1, except that the modified spandex filament obtained in Preparation Example 1 is replaced with the relaxed non-catalytic spandex filament obtained in Comparative Preparation Example 3. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and relaxed non-catalytic spandex yarn (obtained from comparative preparation example 3) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the relaxed non-catalytic spandex yarn as the core fiber to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0068] Comparative Example 4 Comparative Example 4 is the same as Example 1, except that the functional finishing solution prepared in Preparation Example 4 is replaced with the one prepared in Comparative Preparation Example 4. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. Melt spinning is performed, and the yarn enters the 180℃ slow cooling zone. Subsequently, it is cooled by side blowing at 20℃, oiled (oiling rate 0.8%), pre-stretched by the first guide roller at a speed of 900m / min, main stretching by hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networked (air pressure 0.25MPa), and wound to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core yarn to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from comparative preparation example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0069] Comparative Example 5 Comparative Example 5 is the same as Example 1, except that the functional finishing solution prepared in Preparation Example 4 is replaced with the one prepared in Comparative Preparation Example 5. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core yarn to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from comparative preparation example 5, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0070] Comparative Example 6 Comparative Example 6 is the same as Example 1, except that the dispersant is only stearic acid. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of stearic acid, 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 minutes to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 hours to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core yarn to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0071] Comparative Example 7 Comparative Example 7 is the same as Example 1, except that the dispersant is only a terminal hydroxyl hyperbranched polyester. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of hydroxyl-terminated hyperbranched polyester, 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 minutes to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 hours to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core yarn to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, Pre-setting and hot water washing: After pre-setting the greige fabric on a hot air tenter frame (temperature 185℃, speed 35m / min, overfeed 8%), it is treated in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0072] Comparative Example 8 Comparative Example 8 is the same as Example 1, except that the pre-forming process in step 5 is omitted, and the fabric is directly immersed in hot water at 80°C for washing. The subsequent padding and final setting processes remain unchanged. Details are as follows: A high colorfastness and wash-resistant nylon fabric, wherein the nylon fabric is woven from high colorfastness nylon solution-dyed yarn and modified spandex yarn, and the formula and preparation method are as follows: Step 1: By weight, 80 parts of polyamide 6 chips, 2 parts of carbon black, 0.5 parts of dispersant (including stearic acid and hydroxyl-terminated hyperbranched polyester in a 1:1 mass ratio), 1 part of maleic anhydride-grafted polypropylene, and 0.1 parts of sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate are placed in a mixer and mixed at 50°C and 400 rpm for 20 min to obtain a premix. The premix is ​​then placed in an extruder with a screw speed of 200 rpm and the following temperatures set: Zone 1 220°C, Zone 2 234°C, Zone 3 235°C, Zone 4 235°C, and Die Head 235°C. After melt blending, extrusion, water cooling, and pelletizing, the mixture is dried at 80°C and a vacuum of -0.08 MPa for 8 h to obtain a functional black masterbatch. Step 2: After drying polyamide 6 chips at 100℃ and vacuum degree -0.09MPa for 12h, mix them with functional black masterbatch and place them in an extruder. The screw speed is 20rpm, and the temperature is set as follows: Zone 1 240℃, Zone 2 250℃, Zone 3 260℃, and Die head 255℃. After melt spinning, the yarn enters the 180℃ slow cooling zone, and then sequentially undergoes 20℃ side blowing cooling, oiling (oiling rate 0.8%), pre-stretching at 900m / min on the first guide roller, main stretching on the hot roller (stretching temperature 140℃, speed 3800m / min, stretching ratio 3.5 times), networking (air pressure 0.25MPa), and winding to obtain 70D / 48F high color fastness nylon solution yarn. Step 3: Control the mass ratio of high color fastness nylon solution colored yarn and modified spandex yarn (obtained from Preparation Example 1) to 92:8, and use a machine wrapping process to wrap the high color fastness nylon solution colored yarn as the outer fiber and the modified spandex yarn as the core yarn to obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarn is used as both warp and weft yarns. The fabric is woven on a water jet loom with an 8-page heald frame. The process parameters are: loom tension 3200N, machine speed 480r / min, shedding time 305°, back beam height 60mm, warp density 130 threads / inch, weft density 100 threads / inch, and 2 threads per reed in the ground weave to obtain the greige fabric. Step 5, hot water washing: Treat the greige fabric in 80℃ hot water for 35 minutes to wash away impurities on the fabric surface and obtain the washed nylon fabric. Padded finishing and baking of functional finishing solution: The washed nylon fabric was padded in functional finishing solution (prepared from Preparation Example 4, with a padded rate of 60%) at room temperature at a speed of 20 m / min, and then baked at 100°C for 2 min to obtain functional nylon fabric. Final setting and curing: The functional nylon fabric is subjected to final setting for 2.5 minutes at 155℃, machine speed of 35m / min and overfeed of 6% to obtain a nylon fabric with high color fastness and water resistance.

[0073] The comprehensive performance of the high color fastness and washability nylon fabrics prepared in Examples 1-3 and Comparative Examples 1-7 of this invention was tested respectively.

[0074] 1. Color fastness to rubbing test The tests were conducted according to GB / T 3920-2008 standard. Fabric samples were conditioned in standard atmospheric conditions, and then dry and wet rubbing tests were performed using a Y571B type rubbing fastness tester (rubbing head pressure 9N, reciprocating stroke 104mm, 10 cycles; moisture content of the wet rubbing cloth was controlled at 95-100%). After testing, the staining grade was assessed according to GB / T 251-2008.

[0075] 2. Color fastness to soap washing test Tests were conducted according to GB / T 3921-2008 standard. Standard soap solution was used at a liquor ratio of 1:50, and the samples were treated at 40℃ for 30 minutes. After washing, the color change of the original sample and the staining of the lining were assessed. To verify long-term water resistance, an additional portion of the combined samples were subjected to five consecutive soaping cycles before final rating.

[0076] 3. Water repellency rating test Tests were conducted according to AATCC 22-2017 standards. The initial water stain rating (out of 100 points) was tested, and the fabric was tested again after 50 standard washing cycles to evaluate its durable functionality against repeated washing.

[0077] 4. Dimensional change rate test after washing Tests were conducted according to GB / T 8630-2013 standard. A fabric sample with sides of 500mm × 500mm was taken, and reference distances were marked. After washing in a standard Type A washing machine using a conventional program and drying flat, the distances between the marks were measured. The dimensional change rate (%) in the warp and weft directions was calculated. Negative values ​​indicate dimensional shrinkage.

[0078] 5. Piercing Strength Test Referring to the GB / T 19976-2005 standard, the fabric sample (6cm in diameter) to be tested was placed in the annular clamp (25mm inner diameter) of the YG026D electronic fabric strength tester and clamped evenly. A steel ball (20mm in diameter) was used as the bursting head, and the descent speed was set to 110mm / min. The instrument was started, and the steel ball was brought vertically towards the center of the sample until the sample broke. The maximum bursting strength (N) displayed by the instrument was recorded. At least five samples of each type were tested, and the average value was taken.

[0079] The test results are shown in Table 1: Table 1: Data on color fastness to rubbing, color fastness to soaping, water resistance, and bursting strength of the nylon fabrics with high color fastness to washing in Examples 1-3 and Comparative Examples 1-7. Example 1 4-5 4-5 4-5 4-5 95 85 -1.5 / -1.3 558 Example 2 5 4-5 5 4-5 98 88 -1.2 / -1.0 575 Example 3 5 5 5 5 99 90 -1.0 / -0.8 582 Comparative Example 1 4 2 2-3 2 89 60 -3.2 / -3.0 542 Comparative Example 2 4 2-3 3 2 86 65 -2.8 / -2.5 548 Comparative Example 3 3-4 1-2 2 1-2 70 0 -4.5 / -4.1 531 Comparative Example 4 4 2 2-3 1 91 50 -3.6 / -3.2 551 Comparative Example 5 4-5 3 3 2 88 63 -2.5 / -2.2 555 Comparative Example 6 3-4 1-2 2 1 93 85 -1.8 / -1.5 525 Comparative Example 7 4 3 3 2-3 92 85 -1.6 / -1.4 540 Comparative Example 8 4-5 4-5 4-5 4 95 82 -6.8 / -5.5 568 As shown in Table 1, the nylon fabrics prepared in Examples 1-3 of this invention maintain a color fastness of 4-5 or higher after dry / wet rubbing and five consecutive soaping washes. After 50 washes, the water repellency rating remains above 85 points. The warp and weft dimensional shrinkage is less than -1.5%, demonstrating excellent dyeing durability and dimensional stability. Their overall performance is far superior to that of Comparative Examples 1-8.

[0080] As shown in Example 1 and Comparative Examples 1, 2, and 3, when the crosslinking modification of the spandex core filament is damaged or weakened, especially in Comparative Example 3 which did not undergo alkaline catalytic crosslinking, the modified layer was not fully crosslinked, causing the core filament to remain hydrophilic. The fabric not only saw its water repellency rating drop to 0 after 50 washes, but its color fastness to soap washing also plummeted to grade 1-2 after 5 consecutive washes, and its wet rubbing color fastness deteriorated drastically to grade 1-2. This strongly demonstrates that the fabric's excellent overall water resistance and color fastness are not solely achieved by the surface functional coating (Preparation Example 4). Because high-elastic fabrics undergo drastic deformation during washing and rubbing, if the core filament is not deeply modified with hydrophobic crosslinking, moisture will penetrate along the fiber gaps and inside the core filament, causing swelling and ultimately breaking through the surface crosslinked polymer layer from the inside out. The modified spandex filament of this invention provides extremely stable internal physical support for the outer crosslinked polymer coating by restricting the penetration of moisture and detergent into the interior; both inner and outer layers of protection are indispensable.

[0081] Therefore, Comparative Examples 1 and 2 lacked silane coupling agents and hydroxyethyl ester monomers, respectively, and could not form a complete hydrophobic crosslinking protective layer on the surface of spandex core yarn, resulting in reduced wet rubbing color fastness and water washing performance. Comparative Example 3 removed the alkaline aqueous solution catalytic step, indicating that the alkaline environment plays a key catalytic role in the efficient condensation crosslinking of the siloxane structure. The insufficiently crosslinked modified layer is easy to fall off during repeated rubbing and washing, and it is difficult to provide durability.

[0082] As shown in Examples 1 and Comparative Examples 4 and 5, the coating finishing solution in Comparative Example 4 removed glycidyl methacrylate, preventing the crosslinked coating from forming ring-opening covalent bonds with the amino / amide groups on the nylon surface. Experiments showed that even if the solution-dyed yarn itself had good colorfastness, the wet rubbing fastness of the fabric sharply decreased to grade 2 after losing the covalent chemical anchoring of the coating, and the coating easily peeled off, causing the water repellency grade to drop to 50 points after 50 washes. This indicates that the high colorfastness of the present invention is based on the synergistic effect of the coating covalently locking the color of the solution-dyed matrix. Furthermore, combined with Comparative Examples 6 and 7, it was found that if only a single dispersant was used, pigment agglomeration inside the solution-dyed yarn led to a decrease in surface density, and even after the same coating finishing, the dry / wet rubbing fastness still decreased significantly. This further proves that the compound dispersant ensures a deep coupling between the uniform density of the solution matrix and the covalent grafting anchoring of the surface coating, with the coating encapsulating the densely dispersed carbon black particles, jointly inhibiting pigment migration and detachment.

[0083] As can be seen from Example 1 and Comparative Example 8, the lack of high-temperature pre-forming treatment causes the internal stress of the macromolecular chains accumulated in the spinning and weaving stages of the fabric to be released during washing, resulting in a washing dimensional shrinkage rate of -6.8 / -5.5 in Comparative Example 8, and a significant decrease in the washing resistance morphological stability of the fabric.

[0084] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A nylon fabric with high color fastness and washability, characterized in that, The nylon fabric is woven from high color fastness nylon solution dyed yarn and modified spandex yarn, with a mass ratio of 92-97:3-8 between the high color fastness nylon solution dyed yarn and the modified spandex yarn, and the surface of the nylon fabric fibers is grafted with a cross-linked polymer layer. The cross-linked polymer layer is formed by impregnation and baking of a functional finishing liquid on the surface of nylon fibers. The high color fastness nylon solution-dyed yarn comprises the following raw materials in parts by weight: 80-100 parts of polyamide 6 chips, 2-3 parts of carbon black, 0.5-1.5 parts of dispersant, 1-3 parts of compatibilizer, and 0.1-0.5 parts of nucleating agent.

2. The high colorfastness and washability nylon fabric according to claim 1, characterized in that, The modified spandex yarn is a spandex yarn whose surface has been treated with silane coupling agent graft polymerization and crosslinking modification.

3. The high colorfastness and wash-resistant nylon fabric according to claim 2, characterized in that, The method for preparing the modified spandex yarn includes the following steps: S1. Place the spandex filament in a low-temperature plasma treatment device, under an argon atmosphere, control the power at 50-100W, and the treatment time at 30-60s to obtain activated spandex filament; S2. Dissolve 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, and azobisisobutyronitrile in an alcohol solvent to obtain a grafting solution; immerse the activated spandex filament in the grafting solution for 15-20 seconds, perform one dip and one roll, with a roll-off rate of 60-80%, and then treat it at 120-130℃ for 3-5 minutes to obtain grafted modified spandex filament. S3. The grafted modified spandex yarn is catalytically treated with an alkaline aqueous solution within 1-3 seconds, and then treated at 150-160℃ for 2-3 minutes to obtain cross-linked modified spandex yarn; S4. The cross-linked modified spandex yarn is subjected to heat relaxation treatment at 75-80℃ for 30-60 minutes, and then wound up to obtain the modified spandex yarn.

4. The high colorfastness and washability nylon fabric according to claim 3, characterized in that, In step S2, the mass ratio of 3-(methacryloyloxy)propyltrimethoxysilane, 2-hydroxyethyl methacrylate, azobisisobutyronitrile, and alcohol solvent is 1:0.8-1.2:0.08-0.15:30-40.

5. The high colorfastness and washability nylon fabric according to claim 1, characterized in that, The preparation method of the functional finishing liquid includes the following steps: (1) Add polyethylene glycol diacrylate, glycidyl methacrylate and nonionic emulsifier to deionized water in sequence, and shear and disperse for 20-30 min to obtain monomer microemulsion; (2) While stirring, add potassium persulfate to the monomer microemulsion and continue stirring for 10-20 min. Adjust the pH of the system to 5.0-6.0 with organic acid to obtain a mixture. (3) Place the mixture in a homogenizer and homogenize it 3-5 times at a pressure of 35-40 MPa, with an interval of 5-10 minutes between each time. Then add deionized water to adjust the solid content of the system to 30-50% to obtain the functional finishing solution.

6. The high colorfastness and wash-resistant nylon fabric according to claim 5, characterized in that, In step (1), the mass ratio of polyethylene glycol diacrylate, glycidyl methacrylate, nonionic emulsifier and deionized water is 1:0.8-1.2:0.5-1.5:6-10.

7. The high colorfastness and wash-resistant nylon fabric according to claim 5, characterized in that, In step (2), the mass ratio of monomer microemulsion to potassium persulfate is 1.5-2.5:0.05-0.

1.

8. The high colorfastness and washability nylon fabric according to claim 1, characterized in that, The dispersant in the high color fastness nylon solution-dyed yarn is a mixture of stearic acid and hydroxyl-terminated hyperbranched polyester.

9. The high colorfastness and washability nylon fabric according to claim 1, characterized in that, The compatibilizer in the high color fastness nylon solution-dyed yarn is maleic anhydride-grafted polypropylene or maleic anhydride-grafted ethylene-octene copolymer; the nucleating agent is sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl) phosphate or basic aluminum 2,2'-methylene-bis(4,6-di-tert-butylphenyl) phosphate.

10. A method for preparing a nylon fabric with high color fastness and washability as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: By weight, place polyamide 6 chips, carbon black, dispersant, compatibilizer and nucleating agent in a mixer and mix at 50-70℃ for 10-20 minutes to obtain a premix; place the premix in an extruder, and after melt blending, extrusion, cooling, pelletizing and drying, obtain functional black masterbatch; Step 2: After vacuum drying of polyamide 6 chips, they are mixed with functional black masterbatch and placed in an extruder. After melt spinning, they enter a slow cooling zone at 180-200℃, and then sequentially pass through side blowing cooling, oiling, pre-stretching of the first guide roller, main stretching of the hot roller, networking and winding to obtain high color fastness nylon dope yarn. Step 3: Using a mechanical coating process, high color fastness nylon solution-dyed yarn is used as the outer fiber and modified spandex yarn is used as the core yarn to coat the yarn and obtain an elastic composite yarn. Step 4: Using a plain weave structure, elastic composite yarns are used as warp and weft yarns and woven on a loom to obtain the grey fabric; Step 5: The greige fabric is subjected to pre-setting, hot water washing, padding and baking with functional finishing solution, and final setting and curing to obtain a nylon fabric with high color fastness and water resistance.