A wear-resistant garment fabric and a method for making the same

Abstract

This invention discloses a wear-resistant clothing fabric and its preparation method, belonging to the field of textile technology. It comprises, from the outside in, a wear-resistant surface layer, a microcapsule self-healing layer, a main functional film layer, a salt-retaining buffer layer, and a moisture-wicking inner layer, sequentially connected by dotted hot-pressing composite bonding. The wear-resistant surface layer is a double-layer asymmetric fabric woven from gradient functional core-spun yarns of copolymerized modified nylon 66, island-type composite fibers, and carbon nanotube composite nylon 66 fibers. The microcapsule self-healing layer is a polyurethane film with microcapsules capable of dynamic covalent bond exchange and self-healing. This invention achieves long-term UV resistance through copolymerized modified fibers, utilizes hydrogel microspheres to retain and release chloride ions, actively repairs damage with the microcapsule self-healing layer and dynamic covalent bond materials, and eliminates galvanic corrosion using all-plastic accessories and a conductive network, effectively slowing down the performance degradation of the fabric in high-salt-spray environments.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a wear-resistant clothing fabric and its preparation method. Background Technology

[0002] Abrasion-resistant clothing fabrics are a systematic engineering process comprised of fiber raw materials, yarn structure, fabric weave, and finishing. Commonly used materials include nylon, high-strength polyester, and spandex to enhance strength and elasticity. Structures such as filaments, core-spun yarns, and high twist enhance cohesion, while tear-resistant grids and high-density weaving disperse stress. Resin finishing, PU coating, and three-proof treatments further strengthen surface abrasion resistance and protective properties. These fabrics balance durability, comfort, and functionality, meeting the needs of various scenarios such as outdoor activities, workwear, and cycling, and are developing towards lightweight and environmentally friendly designs.

[0003] In terms of workwear, equipment such as long-term ocean-going sailing suits, coastal patrol suits, or offshore wind power work suits are subjected to repeated immersion in high-concentration chloride ion seawater electrolytes and alternating wet and dry conditions, suitable temperature and humidity conditions for microbial adhesion, and high-intensity ultraviolet radiation. Conventional abrasion-resistant clothing fabrics are difficult to accurately predict the overall lifespan of the fabric before service. Often, it is not until 6 to 18 months of actual use that the nylon base fabric's tensile strength retention rate decreases by 30% to 60% due to UV-dominated photo-oxidation, and the hydrostatic pressure index of the waterproof membrane decreases by 50% to 80% due to microcracks and coating embrittlement. The overall fabric shows performance degradation rather than obvious damage. The equipment may appear to be in good condition, but it has lost the protection and durability expected at the time of design. This forces users to face the risk of increased unplanned replacement costs or insufficient safety redundancy during service life. At the same time, it exposes the limitations of traditional fabrics in dealing with the high-salt, high-humidity, and high-UV complex environment of the ocean.

[0004] Therefore, a wear-resistant clothing fabric and its preparation method are proposed to solve or alleviate the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wear-resistant clothing fabric and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A wear-resistant clothing fabric includes, from the outside to the inside, a wear-resistant surface layer, a microcapsule self-repairing layer, a main functional film layer, a salt retention buffer layer, and a moisture-wicking inner layer, which are sequentially connected by dotted hot pressing. The wear-resistant surface layer is a double-layer asymmetric fabric woven from gradient functional core-spun yarns of copolymerized modified nylon 66, island-type composite fibers, and carbon nanotube composite nylon 66 fibers. The microcapsule self-healing layer is a polyurethane film with microcapsules that can dynamically exchange covalent bonds for self-healing. The main functional membrane layer is a bulk polytetrafluoroethylene membrane; The salt retention buffer layer is a microporous polyurethane coating with hydrogel microspheres. The moisture-wicking inner layer is made of hydrophilic modified nylon 66 warp-knitted mesh fabric.

[0007] Preferably, the gradient functional core-spun yarn includes a core layer, an intermediate layer disposed outside the core layer, and a surface layer disposed outside the intermediate layer. The core layer includes carbon nanotube composite nylon 66 filaments, which include multi-walled carbon nanotubes that have undergone amination surface modification treatment and a nylon 66 matrix. The intermediate layer includes copolymerized modified nylon 66 filaments, which are formed by embedding 2,2,6,6-tetramethyl-enzyme functional monomers into the nylon 66 main chain via copolymerization at a copolymerization ratio of 3-5 mol%. The surface layer includes island-type composite fibers, which are formed by using nylon 66 as the sea component and polyethylene terephthalate as the island component, and then opening the fibers with alkali solution.

[0008] Preferably, the microcapsule self-healing layer comprises a polyurethane film and microcapsules, wherein the microcapsules comprise a capsule and a repair solution of PDI-based dynamic covalent exchange self-healing polyurethane located therein.

[0009] Preferably, the salt retention buffer layer comprises a microporous polyurethane coating and hydrogel microspheres, wherein the hydrogel microspheres are sodium polyacrylate crosslinked hydrogel microspheres.

[0010] Preferably, the hydrophilic modified nylon 66 warp-knitted mesh fabric comprises nylon 66 warp-knitted mesh fabric treated with plasma surface grafting via an acrylic / nitrogen mixed gas.

[0011] The present invention also provides a method for preparing abrasion-resistant clothing fabric, which includes the following steps: S1, Preparation of copolymerized modified nylon 66 slices: Nylon 66 salt containing steric lung-blocking functional monomers is prepared by polycondensation reaction to prepare copolymerized modified nylon 66 slices, so that the ultraviolet stabilization function is permanently embedded in the molecular chain in the form of covalent bonds. S2, Preparation of carbon nanotube composite nylon 66 slices: Surface-modified multi-walled carbon nanotubes are uniformly dispersed into a nylon 66 matrix by double extrusion and mixing to prepare composite slices; S3, multi-component fiber melt spinning, four filaments were prepared by melt spinning of the copolymerized modified nylon 66 chips obtained in S1, the carbon nanotube composite nylon 66 chips obtained in S2, the island-type composite chips of nylon 66 and polyethylene terephthalate, and the side-by-side composite chips of PTT and nylon 66. S4, Gradient Functional Core-Spun Yarn Preparation: The four types of filaments obtained in S3 are combined into gradient functional core-spun yarn through an air-textured coating process. S5, weaving and dyeing, the gradient functional core-spun yarn obtained in S4 is woven into a double-layer asymmetric fabric as a wear-resistant outer layer, and the alkali fiber opening process and dyeing process are continuously completed in the same equipment. At the same time, nylon 66 warp-knitted mesh fabric with hydrophilic modification is prepared to obtain a moisture-wicking inner layer. S6, Functional membrane preparation and surface treatment: Electrospun polytetrafluoroethylene membrane as the main functional membrane, microcapsule self-healing membrane, and salt retention buffer layer were prepared respectively. S7, a five-layer composite with seam sealing, involves layering the wear-resistant surface layer obtained from S5, the main functional film layer obtained from S6, the microcapsule self-healing film, the salt retention buffer layer, and the moisture-wicking inner layer obtained from S5 sequentially from the outside to the inside. The layers are connected by point-like hot pressing and the seams are sealed with self-healing tape to obtain a composite fabric.

[0012] Preferably, in step S1, the preparation of copolymerized modified nylon 66 chips involves preparing copolymerized modified nylon 66 chips by polycondensation of nylon 66 salt containing steric hindrance lung-like functional monomers, thereby permanently embedding the UV stabilization function into the molecular chain via covalent bonds. This specifically includes the following steps: S1.1 Salt formation: In a stainless steel reactor, hexamethylenediamine adipate and 2,2,6,6-tetramethylammonium phosphate functional monomers are dissolved in deionized water at a molar ratio of 95:5-97:3. 0.05-0.1 wt% of phosphate ester antioxidants are added, and the mixture is stirred at 200 rpm at 90-100℃ for 1-2 hours until homogeneous. S1.2 Pre-condensation: The salt solution obtained in step S1.1 is transferred to a high-pressure autoclave condensation reactor, heated to 220-240℃ under a nitrogen protective atmosphere, and the reaction pressure is maintained at 1.5-1.8MPa for 2-3 hours. After S1.3, the reactor pressure is reduced from the reaction pressure in step S1.2 to atmospheric pressure and then further reduced to negative pressure -0.08MPa. The temperature is raised to 270-285℃ and the reaction is carried out for 1-3 hours under continuous nitrogen purging. The melt viscosity is monitored by torque method, and the reaction is terminated when the relative viscosity reaches 2.5-2.8. S1.4 discharge granulation: The melt is extruded through the die of the casting strip and granulated by an underwater pelletizer at a water temperature of 30-40℃, with a pellet size of 2-3mm. S1.5 Drying: Use a vacuum drum dryer to dry for ≥8 hours at a temperature of 90-100℃ and a vacuum degree of -0.09MPa until the moisture content of the slices is ≤300ppm.

[0013] Preferably, in step S2, the preparation of carbon nanotube composite nylon 66 slices involves uniformly dispersing surface-modified multi-walled carbon nanotubes into a nylon 66 matrix via double-squeegee extrusion and mixing to prepare composite slices. The specific steps include: S2.1 Pre-dispersion: Nylon 66 chips and multi-walled carbon nanotubes with amination-modified surface treatment are dry-mixed in a high-speed mixer at a mass ratio of 99.0-99.5:0.5-1.0 for 5-10 minutes at a speed of 500-800 rpm. S2.2 Melt mixing uses a twin-screw extruder with an L / D ratio ≥ 40 and a screw diameter ≥ 35 mm. The temperature zones are set as follows: feeding section 240℃, compression section 265℃, splitting and mixing section 275-285℃, metering section 280℃, die head 285-290℃, screw speed 200-350 rpm, residence time 2-4 min. S2.3 granulation is carried out using a strip-drawing water-cooled pelletizer with a strip-drawing speed of 20-40m / min, a water temperature of 25-35℃, and a pellet size of 2-3mm. S2.4 Drying: Use a vacuum drum dryer to dry for ≥8 hours at a temperature of 90-100℃ and a vacuum degree of -0.09MPa until the moisture content is ≤300ppm.

[0014] Preferably, step S6, the preparation and surface treatment of the functional film layer, involves preparing an electrospun polytetrafluoroethylene film as the main functional film layer, a microcapsule self-healing film, and a salt retention buffer layer, respectively, and specifically includes the following steps: S6.1 microcapsule preparation: A high-speed emulsifier and reactor were used. PDI-based dynamic covalent exchange self-healing polyurethane prepolymer was used as the core material and melamine-formaldehyde resin was used as the wall material. The emulsification speed was 8000-12000 rpm, the reaction temperature was 65-75℃, and the reaction time was 2-4 h to prepare a microcapsule suspension with an average particle size of 5-20 μm. S6.2 Coating and film formation: A micro-gravure roller precision coating machine is used to mix the microcapsule suspension with the polyurethane base liquid. The microcapsules account for 15-30% of the total mass and are coated on the back of the surface fabric. The wet film thickness is 15-30μm. The film is dried to a dry film thickness of 5-15μm at a temperature not exceeding 70℃. The drying temperature should not exceed 70℃ to avoid premature rupture of the microcapsules.

[0015] Preferably, step S6, the preparation and surface treatment of the functional film layer, involves preparing an electrospun polytetrafluoroethylene film as the main functional film layer, a microcapsule self-healing film, and a salt retention buffer layer, respectively, and specifically includes the following steps: S6.3 Hydrogel microspheres were prepared using a reverse-phase suspension polymerization reactor with acrylic acid as monomer and N,N'-methylenebisacrylamide as crosslinking agent. The degree of crosslinking was 0.5-2.0 mol%, the rotation speed was 300-600 rpm, the reaction temperature was 70℃, and the reaction time was 4-6 h. Hydrogel microspheres with an average particle size of 1-5 μm and a water absorption swelling ratio of 3-8 times were prepared. S6.4 Coating and film formation: A micro-gravure roller precision coating machine is used to disperse hydrogel microspheres in a microporous polyurethane base liquid. The microspheres account for 20-35% of the total mass and are coated on the back side of the ePTFE membrane obtained in step six. The wet film thickness is 10-20 μm, and it is dried at a temperature of 50-60℃ to a dry film thickness of 5-8 μm.

[0016] The present invention has the following beneficial effects: This invention achieves long-term UV resistance through copolymerized modified fibers, utilizes hydrogel microspheres to trap and release chloride ions, combines a microcapsule self-healing layer with dynamic covalent bond materials to actively repair damage, and uses all-plastic accessories and conductive networks to eliminate galvanic corrosion, effectively slowing down the performance degradation of the fabric in high salt spray environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the wear-resistant clothing fabric in this invention; Figure 2 This is a flowchart of the method for preparing abrasion-resistant clothing fabric in this invention.

[0019] 1. Wear-resistant surface layer; 2. Microcapsule self-healing layer; 3. Main functional membrane layer; 4. Salt retention buffer layer; 5. Moisture-wicking inner layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] A type of durable clothing fabric, such as Figure 1 As shown, it includes, from the outside to the inside, a wear-resistant surface layer 1, a microcapsule self-repairing layer 2, a main functional membrane layer 3, a salt retention buffer layer 4, and a moisture-wicking inner layer 5, which are connected by point-like hot-press composite bonding. The wear-resistant surface layer 1 is a double-layer asymmetric fabric woven from gradient functional core-spun yarn made of copolymerized modified nylon 66, island-type composite fiber, and carbon nanotube composite nylon 66 fiber. More specifically, the gradient functional core-spun yarn includes a core layer, an intermediate layer disposed outside the core layer, and a surface layer disposed outside the intermediate layer. The core layer includes carbon nanotube composite nylon 66 filaments, which include multi-walled carbon nanotubes with aminated surface modification treatment and a nylon 66 matrix. The intermediate layer includes copolymerized modified nylon 66 filaments, which are produced by co-condensation of 2,2,6,6-tetramethyl-N-acetylene functional monomers. The core-spun yarn is formed by embedding the main chain of nylon 66 and copolymerizing it at a ratio of 3-5 mol%. The surface layer includes island-type composite fibers. The island-type composite fibers are formed by opening the fibers with nylon 66 as the sea component and polyethylene terephthalate as the island component. The gradient functional core-spun yarn is composited by air-textured coating process. The 2,2,6,6-tetramethyl arbutin functional monomers are selected from one or more of the following: 4-amino-2,2,6,6-tetramethyl arbutin-4-carboxylic acid, or arbutin diamine or arbutin diamine biopolymers containing bifunctional groups synthesized with 4-hydroxy-2,2,6,6-tetramethyl arbutin as the initiator. In addition, the double-layer asymmetric fabric has an outer layer and an inner layer. The outer layer adopts a variable yoke structure with 7 floats and 3 fly counts. The warp yarns are gradient functional core-spun yarns, and the weft yarns are gradient functional core-spun yarns with a warp density of ≥55 ends / cm and a weft density of ≥42 ends / cm. The inner layer uses a 2 / 1 twill weave, and the weft yarn is PTT / PA66 parallel bicomponent elastic fiber with a linear density of 40D, accounting for 10% of the total fabric weight; The microcapsule self-healing layer 2 is a polyurethane film with microcapsules that can dynamically exchange covalent bonds for self-healing. More specifically, the microcapsule self-healing layer 2 includes a polyurethane film and microcapsules, wherein the microcapsules include capsules and a repair solution of PDI-based dynamically exchange covalent bonds for self-healing polyurethane located therein. The main functional membrane layer 3 is a bulk polytetrafluoroethylene membrane; The salt retention buffer layer 4 is a microporous polyurethane coating with hydrogel microspheres. More specifically, the salt retention buffer layer 4 includes a microporous polyurethane coating and hydrogel microspheres, wherein the hydrogel microspheres are sodium polyacrylate crosslinked hydrogel microspheres. The moisture-wicking inner layer 5 is a hydrophilic modified nylon 66 warp-knitted mesh fabric. More specifically, the hydrophilic modified nylon 66 warp-knitted mesh fabric includes nylon 66 warp-knitted mesh fabric treated with plasma surface grafting through an acrylic / nitrogen mixed gas.

[0027] This invention also provides a method for preparing abrasion-resistant clothing fabric, for use in preparing the abrasion-resistant clothing fabric described above, such as... Figure 2 As shown, it includes the following steps: S1, Preparation of copolymerized modified nylon 66 slices: Nylon 66 salt containing steric lung-blocking functional monomers is prepared by polycondensation reaction to prepare copolymerized modified nylon 66 slices, so that the ultraviolet stabilization function is permanently embedded in the molecular chain in the form of covalent bonds. S1.1 Salt formation: In a stainless steel reactor, hexamethylenediamine adipate and 2,2,6,6-tetramethylammonium phosphate functional monomers are dissolved in deionized water at a molar ratio of 95:5-97:3. 0.05-0.1 wt% of phosphate ester antioxidants are added, and the mixture is stirred at 200 rpm at 90-100℃ for 1-2 hours until homogeneous. S1.2 Pre-condensation: The salt solution obtained in step S1.1 is transferred to a high-pressure autoclave condensation reactor, heated to 220-240℃ under a nitrogen protective atmosphere, and the reaction pressure is maintained at 1.5-1.8MPa for 2-3 hours. After S1.3, the reactor pressure is reduced from the reaction pressure in step S1.2 to atmospheric pressure and then further reduced to negative pressure -0.08MPa. The temperature is raised to 270-285℃ and the reaction is carried out for 1-3 hours under continuous nitrogen purging. The melt viscosity is monitored by torque method, and the reaction is terminated when the relative viscosity reaches 2.5-2.8. S1.4 discharge granulation: The melt is extruded through the die of the casting strip and granulated by an underwater pelletizer at a water temperature of 30-40℃, with a pellet size of 2-3mm. S1.5 Drying: Use a vacuum drum dryer to dry for ≥8 hours at a temperature of 90-100℃ and a vacuum degree of -0.09MPa until the moisture content of the slices is ≤300ppm; S2, Preparation of carbon nanotube composite nylon 66 slices: Surface-modified multi-walled carbon nanotubes are uniformly dispersed into a nylon 66 matrix by double extrusion and mixing to prepare composite slices; S2.1 Pre-dispersion: Nylon 66 chips and multi-walled carbon nanotubes with amination-modified surface treatment are dry-mixed in a high-speed mixer at a mass ratio of 99.0-99.5:0.5-1.0 for 5-10 minutes at a speed of 500-800 rpm. S2.2 Melt mixing uses a twin-screw extruder with an L / D ratio ≥ 40 and a screw diameter ≥ 35 mm. The temperature zones are set as follows: feeding section 240℃, compression section 265℃, splitting and mixing section 275-285℃, metering section 280℃, die head 285-290℃, screw speed 200-350 rpm, residence time 2-4 min. S2.3 granulation is carried out using a strip-drawing water-cooled pelletizer with a strip-drawing speed of 20-40m / min, a water temperature of 25-35℃, and a pellet size of 2-3mm. S2.4 Drying: Use a vacuum drum dryer to dry for ≥8 hours at a temperature of 90-100℃ and a vacuum degree of -0.09MPa until the moisture content is ≤300ppm; S3, multi-component fiber melt spinning, four filaments were prepared by melt spinning of the copolymerized modified nylon 66 chips obtained in S1, the carbon nanotube composite nylon 66 chips obtained in S2, the island-type composite chips of nylon 66 and polyethylene terephthalate, and the side-by-side composite chips of PTT and nylon 66. S3.1 Copolymer Modified Nylon 66 Filament: Utilizing a single-component melt spinning machine with 48-72 nozzle holes, spinning temperature 275-290℃, spinning speed 800-1200m / min, draw ratio 4.5-5.0×, stretching roller temperature 140-160℃, and heat setting temperature 180-200℃; Output specifications are 78D / 48f, tensile strength ≥5.5cN / dtex, and elongation at break 20-30%. S3.2 Carbon nanotube composite nylon 66 filaments were produced using the same type of spinning machine as in step S3.1, with a spinning temperature of 280-295℃, a spinning speed of 600-900 m / min, a draw ratio of 4.5-5.5×, and a heat setting temperature of 180-200℃. The resulting filaments had a specification of 70D / 36f, a tensile strength ≥6.5 cN / dtex, and a volume resistivity ≤10. 6 Ω·cm; S3.3 island-type composite fiber is produced using a bicomponent composite spinning machine equipped with an island-type nozzle. The number of islands is 16-37 per fiber. The sea component is nylon 66, and the island component is polyethylene terephthalate. The cross-sectional area ratio of the island components is 7:3-6:4. The spinning temperature of the sea component is 275-285℃, and the spinning temperature of the island component is 285-295℃. The spinning speed is 600-800m / min, the elongation ratio is 4.0-4.5×, and the output specification is 75D / 36f. S3.4PTT / Nylon 66 parallel bicomponent elastic yarn, produced using a bicomponent composite spinning machine equipped with parallel nozzles. PTT spinning temperature is 245-260℃, Nylon 66 spinning temperature is 275-285℃, parallel ratio is 1:1, spinning speed is 800-1000m / min, elongation ratio is 3.5-4.0×, output specification is 40D / 24f, crimp shrinkage rate is ≥40%; S4, Gradient Functional Core-Spun Yarn Preparation: The four types of filaments obtained in S3 are combined into gradient functional core-spun yarn through an air-textured coating process. S4.1 Core layer introduction: The 70D carbon nanotube composite nylon 66 filament obtained in S3.2 is introduced into the center of the nozzle of the air textured coating machine as the core filament, with a yarn tension of 15-25cN. The core filament accounts for 38-42% of the total yarn weight. S4.2 Intermediate layer coating: The copolymerized modified nylon 66 filament 78D obtained in S3.1 is coated onto the core layer through the first outer wrapping nozzle. The air pressure is 0.3-0.5MPa, the yarn passing speed is 300-500m / min, the entanglement frequency is controlled at 60-80 knots / m, and the intermediate layer accounts for 33-37% of the total yarn weight. S4.3 Surface coating: The 75D island-type composite fiber obtained from S3.3 is coated onto the middle layer through a second outer coating nozzle. The air pressure is 0.4-0.6MPa, the yarn passing speed is 300-500m / min, and the surface layer accounts for 23-27% of the total yarn weight. S4.4 winding and shaping: The wrapped yarn is wound using a winding machine with a winding coefficient of 400-450T / m, a winding speed of 50-80m / min, and a winding direction of Z-winding, to obtain a three-layer gradient functional core-spun yarn with a bus density of 150D-200D. S5, weaving and dyeing, the gradient functional core-spun yarn obtained in S4 is woven into a double-layer asymmetric fabric as the wear-resistant outer layer 1, and the alkali fiber opening process and dyeing process are continuously completed in the same equipment. At the same time, nylon 66 warp-knitted mesh fabric with hydrophilic modification is prepared to obtain the moisture-wicking inner layer 5. S5.1 warp warping: The graded functional core-spun yarn obtained from S4 is used as the warp warping machine, with a warp density of ≥55 yarns / cm. The variable density graded tear-resistant reinforcing yarn is arranged in zones according to the wear risk level of the garment parts. Specifically: in the high wear risk zone, two 140D carbon nanotube composite nylon 66 reinforcing yarns are embedded every 4mm; in the medium wear risk zone, a single 110D copolymer modified nylon 66 reinforcing yarn is embedded every 6mm; and in the low wear risk zone, a single 78D copolymer modified nylon 66 reinforcing yarn is embedded every 8mm. S5.2 double-layer weaving, using a split-end multi-arm double-layer loom, with a width ≥160cm, a weaving speed of 20-40 picks / min, and a weft density ≥42 ends / cm; the front side uses a variable twill weave with 7 floats and 3 fly counts, and the weft yarn is a gradient functional core-spun yarn; the reverse side uses a 2 / 1 twill weave, and the weft yarn is 40D PTT / Nylon 66 elastic yarn obtained from S3.4; the front and back sides are connected by a knotting yarn; S5.3 In an overflow dyeing machine, dissolve the marine components by heating with 2-4% NaOH owf at a liquor ratio of 1:10-1:15, raising the temperature from room temperature to 95°C and holding for 30-40 minutes. Then, wash thoroughly with water and neutralize with acetic acid to pH 5-6. After completing alkali opening and neutralization, change the bath in the same equipment and dye with acidic dyes or weakly acidic metal complex dyes at pH 4-6 and a temperature of 95-100°C for 40-60 minutes. S5.4 Washing and neutralization: In the same dyeing machine, perform two cold water washes, room temperature acid neutralization (icy acid concentration 0.5-1.0 g / L, 10 min), hot water wash (60℃ / 15 min), and cold water wash in sequence. S5.5 stretch drying uses a stretch dryer with zoned temperature control: inlet 120℃, middle 140℃, outlet 130℃, speed 20-30m / min, and width control within ±1% of the claimed width of the base fabric. S5.6 mesh fabric is woven using a warp knitting machine with nylon 66 filament 30D / 12f as raw material to create a hexagonal mesh structure. The machine speed is ≥1000rpm, the weight is 30-45g / m², and the width is ≥160cm. S5.7 hydrophilic modification was performed using a roll-to-roll atmospheric pressure plasma treatment machine. The treatment gas was a mixture of acrylic acid and nitrogen, with an acrylic acid volume fraction of 5-10%, a power of 150-250W, a treatment speed of 5-10m / min, and an electrode spacing of 3-5mm. After treatment, the water contact angle on the mesh fabric surface decreased from ≥70° to ≤30°, and the drying rate was ≥80% after 30 minutes. S6, Functional membrane preparation and surface treatment: Electrospun polytetrafluoroethylene membrane as the main functional membrane 3, microcapsule self-healing film, and salt retention buffer layer 4 were prepared respectively. S6.1 microcapsule preparation: A high-speed emulsifier and reactor were used. PDI-based dynamic covalent exchange self-healing polyurethane prepolymer was used as the core material and melamine-formaldehyde resin was used as the wall material. The emulsification speed was 8000-12000 rpm, the reaction temperature was 65-75℃, and the reaction time was 2-4 h to prepare a microcapsule suspension with an average particle size of 5-20 μm. S6.2 Coating and film formation: A micro-gravure roller precision coating machine is used to mix the microcapsule suspension with the polyurethane base liquid. The microcapsules account for 15-30% of the total mass and are coated on the back of the surface fabric. The wet film thickness is 15-30μm. The film is dried to a dry film thickness of 5-15μm at a temperature not exceeding 70℃. The drying temperature should not exceed 70℃ to avoid premature rupture of the microcapsules. S6.3 Hydrogel microspheres were prepared using a reverse-phase suspension polymerization reactor with acrylic acid as monomer and N,N'-methylenebisacrylamide as crosslinking agent. The degree of crosslinking was 0.5-2.0 mol%, the rotation speed was 300-600 rpm, the reaction temperature was 70℃, and the reaction time was 4-6 h. Hydrogel microspheres with an average particle size of 1-5 μm and a water absorption swelling ratio of 3-8 times were prepared. S6.4 Coating and film formation: A micro-gravure roller precision coating machine is used to disperse hydrogel microspheres in a microporous polyurethane base liquid. The microspheres account for 20-35% of the total mass and are coated on the back side of the ePTFE membrane obtained in step six. The wet film thickness is 10-20 μm, and it is dried at a temperature of 50-60℃ to a dry film thickness of 5-8 μm. S6.5 spinning solution preparation: PTFE powder is dissolved in a DMF / acetone mixed solvent at a volume ratio of 7:3 and a solution concentration of 8-12wt%. The solution is stirred with a magnetic stirrer for 12 hours and then dispersed with an ultrasonic disperser for 1 hour. S6.6 electrospinning was performed using a roll-to-roll electrospinning machine with a collector width ≥160cm, a voltage of 15-25kV, a feed rate of 0.5-2.0mL / h, and multiple nozzles connected in parallel. The receiving distance was 15-25cm, the ambient temperature was 25±5℃, the ambient humidity was 30-50%RH, and the collection time was adjusted according to the target film thickness of 10-15μm. The resulting nanofibers had an average diameter of 200-500nm and a pore size distribution variation coefficient ≤0.15. S6.7 Hot pressing curing: Using a hot press, hot pressing is performed at a temperature of 300-320℃ and a pressure of 0.2-0.5MPa for 3-5 minutes to fuse the intersections of the nanofibers. At this temperature, the PTFE nanofibers are in a highly elastic state, and the intersections can partially sinter to form a connection, but the fiber body will not completely melt, and the pore structure is preserved. The resulting membrane has an initial hydrostatic pressure ≥12,000 mm H2O and a moisture permeability ≥10,000 g / m² / 24h. S7, a five-layer composite with seam sealing, involves layering the wear-resistant surface layer 1 obtained in S5, the main functional film layer 3 obtained in S6, the microcapsule self-healing film, the salt retention buffer layer 4, and the moisture-wicking inner layer 5 obtained in S5 sequentially from the outside to the inside. The layers are connected by point-like hot pressing and the seams are sealed with self-healing tape to obtain a composite fabric. S7.1 Layering: A multi-layer fabric lamination device is used, and the layers are stacked from the outside to the inside as follows: L1 surface fabric (micro-textured side facing out) → L2 microcapsule self-healing film → L3 electrospun ePTFE film → L4 salt retention buffer layer 4 → L5 inner mesh fabric; the alignment accuracy of each layer is controlled within ±2mm. S7.2 dot-matrix hot-press lamination uses a concave-dot anilox roller type dot-matrix hot-press lamination machine. The upper roller temperature is 130-150℃, the lower roller temperature is 120-140℃, the pressure is 0.3-0.6MPa, the speed is 5-10m / min, the lamination points occupy 15-25% of the lamination area, and the dot diameter is about 0.5-1.0mm. S7.3 stitching, using an industrial sewing machine for double-needle plain stitching or overlock stitching, with PA66 sewing thread, a stitch length of 2.5-3.0mm, and a seam allowance of 10-15%; S7.4 self-healing tape sealing uses a hot air joint sealing machine. The tape is a PDI-based dynamic covalent bond exchange self-healing polyurethane tape. The tape width is 25mm in standard areas and 30mm in high-wear areas. The hot air temperature is 120-150℃, the roller pressure is 0.4-0.6MPa, and the speed is 2-4m / min to ensure sufficient adhesion. The actual surface temperature of the tape is controlled within the range of 100-140℃, and heat sealing is completed within the safe window of PDI-based dynamic imine bonds, preserving the self-healing ability. High-wear areas are covered with double-layer tape, i.e., the first layer is sealed and then the second layer is applied. The self-healing tape has a peel strength recovery rate of ≥75% within 24-48 hours in a 40℃ environment after the microcrack occurs.

[0028] In summary, by embedding 2,2,6,6-tetramethylpiperidine functional monomers into the main chain of nylon 66 in a covalent bond form during the fiber preparation stage to form copolymerized modified fibers, the UV resistance becomes an inherent property of the fiber itself rather than an external additive attached to the surface. This process is completed in a twin-screw polymerization reactor, followed by melting spinning at a temperature of 280°C to 290°C, and then a two-stage stretching process to achieve a total stretch ratio of 4.5 to 5.5 times. Finally, it is heat-set at 180°C to 200°C, so that each fiber molecular chain itself has the ability to capture free radicals and will not be lost due to friction or washing. This solves the fundamental defect of UV stabilizers in conventional abrasion-resistant fabrics gradually migrating and being lost during seawater immersion and alternating wet and dry conditions.

[0029] A microporous polyurethane coating containing hydrogel microspheres is set as a salt retention buffer layer 4. This layer is coated on the back of the main functional membrane layer 3 by gravure roller coating. The coating thickness is controlled between 5 micrometers and 8 micrometers. In a wet state, the hydrogel microspheres absorb water and expand to form a physical sealing barrier, effectively preventing chloride ions from penetrating into the deeper electrospun ePTFE membrane.

[0030] In a dry state, the hydrogel microspheres naturally shrink and release, carrying away the trapped salts from the fabric through the subsequent washing process. This active response to environmental humidity effectively blocks the erosion path of chloride ions.

[0031] Simultaneously, the conductive carbon nanotube composite nylon 66 filaments prepared during the fiber preparation stage are uniformly dispersed in the fiber matrix with a multi-walled carbon nanotube content of 0.5 to 1.0% by weight. These fibers, as reinforcing yarns, are evenly distributed throughout the entire fabric width to form a continuous conductive network. Even if there are a few unavoidable trace metal contact points, the local potential difference can be dispersed through the conductive network, preventing the corrosion current from concentrating on a small area. At the same time, due to the inclusion of carbon nanotubes, they have strong absorption characteristics in the 300-400nm wavelength band, enabling them to have good ultraviolet absorption function. Furthermore, due to their aspect ratio ≥1000, they form a nanoscale reinforcing network in the nylon 66 matrix, which can increase the fiber tensile strength by about 15-25%. Thus, the addition of carbon nanotubes not only gives the filaments good antistatic effects but also achieves the effects of ultraviolet absorption and tensile strength enhancement.

[0032] To address the potential issues of interlayer delamination and microcrack propagation in multilayer composite structures during long-term service, a self-healing layer containing PDI-based self-healing polyurethane microcapsules is developed. The microcapsules have an average particle size of 5 to 15 micrometers and are coated with a layer of 5 to 10 micrometers thickness by scraping. When the wear-resistant sacrificial surface develops microcracks due to long-term use, the microcapsules rupture under the stress of crack propagation, releasing the repair fluid.

[0033] The process involves filling cracks and gaps and restoring the cross-linked network through reversible exchange of dynamic imine bonds at room temperature. Simultaneously, PDI-based self-healing polyurethane tape, also based on the principle of dynamic covalent bond exchange, is used in the sewing process. It is applied to the garment seams using a hot air seam sealing machine at a hot air temperature of 500℃ to 600℃ and a pressure roller pressure of 0.2MPa to 0.3MPa. This allows the micro-cracks at the seams to repair themselves within 24 to 48 hours, thus transforming the irreversible damage accumulation in conventional fabrics into a reversible self-healing process.

[0034] During the weaving stage, this solution uses a multi-arm healdrying mechanism to dynamically adjust the spacing and denier of the tear-resistant reinforcing yarns in different parts of the garment according to the wear risk level. In high wear risk areas, two 140D conductive carbon nanotube composite PA66 filaments are embedded with a 4 mm spacing; in medium wear risk areas, a single 110D copolymer modified nylon 66 filament is embedded with a 6 mm spacing; and in low wear risk areas, a single 78D copolymer modified nylon 66 filament is embedded with an 8 mm spacing. This ensures that the amount of material used is precisely matched to the wear risk, avoiding excessive material usage and weight increase caused by full-width or other specifications of reinforcement.

[0035] In the yarn preparation stage, conductive carbon nanotube composite nylon 66 filaments are used as the core layer, copolymerized modified nylon 66 filaments as the middle layer, and island-type composite fibers as the surface layer, one layer at a time, through an air textured coating machine. Then, the yarn is twisted at a twist rate of 400T / m to 450T / m using a doubling twister. This forms a gradient functional core-spun yarn where the core layer provides antistatic and UV absorption, the middle layer provides molecular-level UV stabilization, and the surface layer uses ultra-fine fiber bundles to achieve abrasion resistance. This ensures that after each layer is worn, the next layer can be exposed to continue to exert abrasion resistance, forming a good defense.

[0036] Therefore, the performance degradation curve of this fabric in the high salt spray environment of the ocean changes from a steep decline to a relatively gentle gradient. The decline in seam peel strength, base fabric breaking strength retention rate and hydrostatic pressure index of waterproof membrane during the 6 to 18 months of service is controlled to be far lower than that of conventional fabrics. This effectively reduces the unplanned replacement costs caused by premature scrapping and ensures that the equipment maintains sufficient safety time throughout the expected service life.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wear-resistant clothing fabric, characterized in that, It includes a wear-resistant surface layer (1), a microcapsule self-repairing layer (2), a main functional membrane layer (3), a salt retention buffer layer (4), and a moisture-wicking inner layer (5), which are connected sequentially from the outside to the inside by point-like hot-pressing composite connection. The wear-resistant surface layer (1) is a double-layer asymmetric fabric woven from gradient functional core-spun yarn of copolymer modified nylon 66, island-type composite fiber and carbon nanotube composite nylon 66 fiber. The microcapsule self-healing layer (2) is a polyurethane film with microcapsules that can dynamically exchange covalent bonds for self-healing. The main functional membrane layer (3) is a bulk polytetrafluoroethylene membrane; The salt retention buffer layer (4) is a microporous polyurethane coating with hydrogel microspheres; The moisture-wicking inner layer (5) is made of hydrophilic modified nylon 66 warp-knitted mesh fabric.

2. The wear-resistant clothing fabric according to claim 1, characterized in that, The gradient functional core-spun yarn includes a core layer, an intermediate layer disposed outside the core layer, and a surface layer disposed outside the intermediate layer. The core layer includes carbon nanotube composite nylon 66 filaments, which consist of multi-walled carbon nanotubes that have undergone amination surface modification and a nylon 66 matrix. The intermediate layer includes copolymerized modified nylon 66 filaments, which are formed by embedding 2,2,6,6-tetramethyl-enzyme functional monomers into the nylon 66 backbone via copolymerization at a copolymerization ratio of 3-5 mol%. The surface layer includes island-type composite fibers, which are formed by using nylon 66 as the island component and polyethylene terephthalate as the island component, and then opening the fibers with alkali solution.

3. The wear-resistant clothing fabric according to claim 1, characterized in that, The microcapsule self-healing layer (2) includes a polyurethane film and microcapsules, wherein the microcapsules include a capsule and a repair solution of PDI-based dynamic covalent exchange self-healing polyurethane located therein.

4. The wear-resistant clothing fabric according to claim 1, characterized in that, The salt retention buffer layer (4) includes a microporous polyurethane coating and hydrogel microspheres, wherein the hydrogel microspheres are sodium polyacrylate crosslinked hydrogel microspheres.

5. The wear-resistant clothing fabric according to claim 1, characterized in that, The hydrophilic modified nylon 66 warp-knitted mesh fabric includes nylon 66 warp-knitted mesh fabric treated with plasma surface grafting via an acrylic / nitrogen mixed gas.

6. A method for preparing abrasion-resistant clothing fabric, used to prepare the abrasion-resistant clothing fabric as described in any one of claims 1-5, characterized in that, Includes the following steps: S1, Preparation of copolymerized modified nylon 66 slices: Nylon 66 salt containing steric lung-blocking functional monomers is prepared by polycondensation reaction to prepare copolymerized modified nylon 66 slices, so that the ultraviolet stabilization function is permanently embedded in the molecular chain in the form of covalent bonds. S2, Preparation of carbon nanotube composite nylon 66 slices: Surface-modified multi-walled carbon nanotubes are uniformly dispersed into a nylon 66 matrix by double extrusion and mixing to prepare composite slices; S3, multi-component fiber melt spinning, four filaments were prepared by melt spinning of the copolymerized modified nylon 66 chips obtained in S1, the carbon nanotube composite nylon 66 chips obtained in S2, the island-type composite chips of nylon 66 and polyethylene terephthalate, and the side-by-side composite chips of PTT and nylon 66. S4, Gradient Functional Core-Spun Yarn Preparation: The four types of filaments obtained in S3 are combined into gradient functional core-spun yarn through an air-textured coating process. S5, weaving and dyeing, the gradient functional core-spun yarn obtained in S4 is woven into a double-layer asymmetric fabric as a wear-resistant outer layer (1), and the alkali fiber opening process and dyeing process are continuously completed in the same equipment. At the same time, a nylon 66 warp-knitted mesh fabric with hydrophilic modification is prepared to obtain a moisture-wicking inner layer (5). S6, Functional film preparation and surface treatment: Electrospun polytetrafluoroethylene film as the main functional film (3), microcapsule self-healing film, and salt retention buffer layer (4) were prepared respectively. S7, five-layer composite and seam sealing, the wear-resistant surface layer (1) obtained from S5, the main functional film layer (3) obtained from S6, the microcapsule self-healing film, the salt retention buffer layer (4) and the moisture-wicking inner layer (5) obtained from S5 are stacked from the outside to the inside, and the layers are connected by point hot pressing composite, and the seams are sealed with self-healing tape to obtain composite fabric.

7. The method for preparing abrasion-resistant clothing fabric according to claim 6, characterized in that, S1, preparation of copolymerized modified nylon 66 chips, involves preparing copolymerized modified nylon 66 chips by polycondensation of nylon 66 salt containing steric hindrance lung-like functional monomers, thereby permanently embedding the ultraviolet stabilization function into the molecular chain in the form of covalent bonds. Specifically, this includes the following steps: S1.1 Salt formation: In a stainless steel reactor, hexamethylenediamine adipate and 2,2,6,6-tetramethylammonium phosphate functional monomers are dissolved in deionized water at a molar ratio of 95:5-97:

3. 0.05-0.1 wt% of phosphate ester antioxidants are added, and the mixture is stirred at 200 rpm at 90-100℃ for 1-2 hours until homogeneous. S1.2 Pre-condensation: The salt solution obtained in step S1.1 is transferred to a high-pressure autoclave condensation reactor, heated to 220-240℃ under a nitrogen protective atmosphere, and the reaction pressure is maintained at 1.5-1.8MPa for 2-3 hours. After S1.3, the reactor pressure is reduced from the reaction pressure in step S1.2 to atmospheric pressure and then further reduced to negative pressure -0.08MPa. The temperature is raised to 270-285℃ and the reaction is carried out for 1-3 hours under continuous nitrogen purging. The melt viscosity is monitored by torque method, and the reaction is terminated when the relative viscosity reaches 2.5-2.

8. S1.4 discharge granulation: The melt is extruded through the die of the casting strip and granulated by an underwater pelletizer at a water temperature of 30-40℃, with a pellet size of 2-3mm. S1.5 Drying: Use a vacuum drum dryer to dry for ≥8 hours at a temperature of 90-100℃ and a vacuum degree of -0.09MPa until the moisture content of the slices is ≤300ppm.

8. The method for preparing abrasion-resistant clothing fabric according to claim 6, characterized in that, S2, the preparation of carbon nanotube composite nylon 66 slices, involves uniformly dispersing surface-modified multi-walled carbon nanotubes into a nylon 66 matrix via double-squeegee extrusion and mixing to prepare composite slices. The specific steps include: S2.1 Pre-dispersion: Nylon 66 chips and multi-walled carbon nanotubes with amination-modified surface treatment are dry-mixed in a high-speed mixer at a mass ratio of 99.0-99.5:0.5-1.0 for 5-10 minutes at a speed of 500-800 rpm. S2.2 Melt mixing uses a twin-screw extruder with an L / D ratio ≥ 40 and a screw diameter ≥ 35 mm. The temperature zones are set as follows: feeding section 240℃, compression section 265℃, splitting and mixing section 275-285℃, metering section 280℃, die head 285-290℃, screw speed 200-350 rpm, residence time 2-4 min. S2.3 granulation is carried out using a strip-drawing water-cooled pelletizer with a strip-drawing speed of 20-40m / min, a water temperature of 25-35℃, and a pellet size of 2-3mm. S2.4 Drying: Use a vacuum drum dryer to dry for ≥8 hours at a temperature of 90-100℃ and a vacuum degree of -0.09MPa until the moisture content is ≤300ppm.

9. The method for preparing abrasion-resistant clothing fabric according to claim 6, characterized in that, S6, the preparation and surface treatment of the functional film layer, respectively prepares an electrospun polytetrafluoroethylene film as the main functional film layer (3), a microcapsule self-healing film, and a salt retention buffer layer (4), which specifically includes the following steps: S6.1 microcapsule preparation: A high-speed emulsifier and reactor were used. PDI-based dynamic covalent exchange self-healing polyurethane prepolymer was used as the core material and melamine-formaldehyde resin was used as the wall material. The emulsification speed was 8000-12000 rpm, the reaction temperature was 65-75℃, and the reaction time was 2-4 h to prepare a microcapsule suspension with an average particle size of 5-20 μm. S6.2 Coating and film formation: A micro-gravure roller precision coating machine is used to mix the microcapsule suspension with the polyurethane base liquid. The microcapsules account for 15-30% of the total mass and are coated on the back of the surface fabric. The wet film thickness is 15-30μm. The film is dried to a dry film thickness of 5-15μm at a temperature not exceeding 70℃. The drying temperature should not exceed 70℃ to avoid premature rupture of the microcapsules.

10. The method for preparing abrasion-resistant clothing fabric according to claim 6, characterized in that, S6, the preparation and surface treatment of the functional film layer, respectively prepares an electrospun polytetrafluoroethylene film as the main functional film layer (3), a microcapsule self-healing film, and a salt retention buffer layer (4), and specifically includes the following steps: S6.3 Hydrogel microspheres were prepared using a reverse-phase suspension polymerization reactor with acrylic acid as monomer and N,N'-methylenebisacrylamide as crosslinking agent. The degree of crosslinking was 0.5-2.0 mol%, the rotation speed was 300-600 rpm, the reaction temperature was 70℃, and the reaction time was 4-6 h. Hydrogel microspheres with an average particle size of 1-5 μm and a water absorption swelling ratio of 3-8 times were prepared. S6.4 Coating and film formation: A micro-gravure roller precision coating machine is used to disperse hydrogel microspheres in a microporous polyurethane base liquid. The microspheres account for 20-35% of the total mass and are coated on the back side of the ePTFE membrane obtained in step six. The wet film thickness is 10-20 μm, and it is dried at a temperature of 50-60℃ to a dry film thickness of 5-8 μm.

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