A fancy yarn knitted fabric of yak wool

Abstract

The present application relates to a yak cashmere fancy yarn woven fabric, belonging to the field of textile technology. One side of the fabric is a heating and antibacterial layer (1), and the other side is a colorful ultraviolet-proof layer (2). The heating and antibacterial layer (1) and the colorful ultraviolet-proof layer (2) are connected by weft knitting double-layer organization. The weft knitting double-layer organization contains a twenty-four-way loop system. The odd-numbered loop system feeds in fancy yarn, and the even-numbered loop system feeds in heating and antibacterial blended yarn. The heating and antibacterial layer (1) is formed by knitting, and the colorful ultraviolet-proof layer (2) is formed by knitting. The heating and antibacterial blended yarn is spun by uniformly mixing antibacterial and heating yak cashmere fibers, modal fibers and chitosan fibers. The fancy yarn is a three-layer structure formed by core yarn, decorative yarn and fixed yarn. The functions of the yarn make the fabric have the functions of elasticity, beauty and ultraviolet-proof.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to a yak wool fancy yarn woven fabric. Background Technology

[0002] Fancy yarns, also known as specialty yarns, refer to yarns with unique structures and appearances obtained by processing fibers or yarns using special raw materials, equipment, or processes during spinning and yarn making. They are a type of yarn product with a decorative function. The structure of fancy yarns typically consists of a core yarn, a decorative yarn, and a fixing yarn. The core yarn bears the strength and is the main yarn; the decorative yarn is twisted and wound around the core yarn to create the effect; the fixing yarn is twisted in the opposite direction and wrapped around the decorative yarn to fix the pattern. This results in yarns with a rich variety of styles.

[0003] Antibacterial properties are a common requirement for textiles, and during the global COVID-19 pandemic, this function has become an important demand from consumers. Currently, there are generally two methods to achieve flame retardant and antibacterial properties in fabrics: one is to use functional auxiliaries to impart functionality through dyeing and finishing; the other is to use functional yarns to impart functionality through weaving. While the method of imparting functionality through auxiliaries is simpler, the durability of the fabric's functionality is insufficient. Therefore, consumers with higher requirements tend to prefer functional fabrics made from functional yarns.

[0004] Fabrics with UV protection and heat-generating properties have always been favored by consumers. The foundation of functional fabrics is functional fibers. Traditional functional fibers are generally given functionality through simple finishing with auxiliaries, which not only has limited effect but also results in low yarn strength and wash resistance. Therefore, chemical treatment and modification of fibers, imbuing the fiber molecular chains with functional groups or grafting functional substances through covalent bonds, can effectively improve the fiber's functional durability and efficiency.

[0005] In summary, the market urgently needs a multifunctional fabric with heat generation, antibacterial properties, moisture absorption and wicking, high-efficiency UV protection, fun features, and attractive patterns to upgrade and expand traditional fabrics. Summary of the Invention

[0006] The purpose of this invention is to provide a yak wool fancy yarn fabric that is heat-generating, antibacterial, moisture-wicking, highly effective in protecting against ultraviolet rays, and has a fun and beautiful pattern.

[0007] The technical solution adopted by this invention to solve the above problems is as follows: a multifunctional yak wool fancy yarn fabric, comprising a heat-generating and antibacterial layer and a multi-colored UV-protective layer; the heat-generating and antibacterial layer and the multi-colored UV-protective layer are woven together by a weft-knitted double-layer structure, the weft-knitted double-layer structure comprising a 24-way loop-forming system, wherein the odd-numbered loop-forming system feeds in fancy yarn to form the multi-colored UV-protective layer; the even-numbered loop-forming system feeds in heat-generating and antibacterial blended yarn to form the heat-generating and antibacterial layer; the heat-generating and antibacterial blended yarn is spun from a uniform mixture of antibacterial and heat-generating yak wool fiber / modal fiber / chitosan fiber in a weight ratio of (25-30):(55-60):(10-20); the fancy yarn comprises, from the inside out: Core yarn: an air-covered yarn formed by connecting a moisture-absorbing and moisture-wicking nylon filament and a spandex filament on a connecting yarn machine; Decorative yarn: It is a web-connected yarn formed by connecting a polyester space-dyed filament, a color-changing polyester filament, and a UV-resistant nylon filament on a web-connected yarn machine. During the web-connection process, the airflow from the nozzles of the web-connected machine is used to form web dots on the web-connected yarn. The density of web dots is 80-100 dots / m. The fixed yarn is made of a UV-resistant polyester filament and a SORONA filament twisted together, with the twist of the UV-resistant polyester filament and the SORONA filament being 15~20T / inch.

[0008] The design incorporates a three-layer fancy yarn structure, with each layer functioning synergistically. The core yarn is a web-bonded yarn of moisture-wicking nylon and spandex, while the decorative yarn consists of a web of polyester space-dyed yarn, color-changing polyester yarn, and UV-resistant nylon yarn. The binding yarn is made of UV-resistant polyester and SORONA filament twisted together. Through the function of the yarns, the fabric possesses the elasticity of spandex, the aesthetic appeal of color-changing polyester yarn and polyester space-dyed yarn, and the functionality of UV-resistant yarn.

[0009] The weft-knitted double-layer structure is woven using two sections of needles on the upper needle plate and four sections of needles on the lower needle cylinder. The odd-numbered loop-forming system uses 22cm / 100 needles, while the even-numbered loop-forming system uses 21.5cm / 100 needles. The even-numbered loop-forming system forms a honeycomb mesh structure. The fabric is woven on a 46-inch 32-gauge double-sided knitting machine. The two sections of needles on the upper needle plate are arranged in the order A, B, A, B, and the four sections of needles on the lower needle cylinder are arranged in the order a, b, c, d. In the 24-loop-forming system: The triangular arrangement of the looping system in the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, and 23rd channels is as follows: upper needle plate non-looping triangle, non-looping triangle, lower syringe looping triangle, looping triangle, looping triangle, looping triangle; The triangular arrangement of the second and fourth loop forming systems is as follows: upper needle plate loop forming triangle, loop forming triangle, lower syringe floating line triangle, floating line triangle, floating line triangle, and tucking triangle; The triangular arrangement of the looping system in the 6th, 8th, 22nd, and 24th channels is as follows: upper needle plate looping triangle, looping triangle, lower syringe floating line triangle, floating line triangle, looping triangle, and floating line triangle; The triangular arrangement of the looping system in the 10th, 12th, 18th, and 20th channels is as follows: upper needle plate looping triangle, looping triangle, lower syringe floating line triangle, tucking triangle, floating line triangle, floating line triangle; The triangular arrangement of the 14th and 16th loop forming systems is as follows: upper needle plate loop forming triangle, loop forming triangle, lower needle cylinder tucking triangle, floating line triangle, floating line triangle, floating line triangle.

[0010] It adopts a double-layer composite structure combining a heat-generating antibacterial layer and a colorful UV-protective layer. The tight connection is achieved through a specific weft knitting double-layer structure. It adopts a 24-way loop forming system, with odd-numbered ways of feeding fancy yarns to weave the UV-protective layer and even-numbered ways of feeding heat-generating antibacterial blended yarns to weave the heat-generating antibacterial layer. The double-layer structure effectively solves the connection strength and flatness of the double-layer fabric.

[0011] Furthermore, the preparation method of the antibacterial and heat-generating yak wool fiber is as follows: A1: Yak Wool Reduction Modification: I. Preparation of Reduction Modification Solution: First, inject deionized water into a constant temperature reaction tank, add 1~2g / L of penetrant JFC, and stir for 5 minutes until uniformly mixed; then, add 9~12g / L of sodium bisulfite and 6~8g / L of thiodiethanol sequentially, and stir at 800r / min for 10 minutes; finally, adjust the pH of the system to 8.0~8.5 with sodium hydroxide and set aside; II. Yak Wool Impregnation: Immerse the pretreated and opened yak wool fibers in the prepared reduction modification solution at a bath ratio of 1:(25~30), adjust the reaction temperature to 48~52℃ (constant temperature fluctuation ≤±1℃), and stir at 60~80 Stir the reaction at a low speed of r / min for 30-35 minutes. Stop stirring at the end of the reaction (last 5 minutes), keep it warm and let it stand to ensure that the fibers fully absorb the modified solution; III. Formation of modified yak wool: Take out the reacted yak wool fibers and wash them repeatedly with deionized water at 35-40℃ 3-4 times until the washing solution is neutral (pH=6.5-7.5); put them into a hot air dryer and dry them at a low temperature of 45-50℃ until the fiber moisture regain reaches 8%-10%. Take them out, cool them to room temperature, and seal them for later use; A2: Preparation of Antibacterial Far-Infrared Composite Finishing Solution: Ⅰ. Basic Preparation: Add a measured amount of deionized water to the mixing tank, and add sodium polyacrylate (dispersant) at a dosage of 1-2 g / L. Stir at a constant speed of 1000 r / min for 10 minutes to form a uniform and transparent mixture without sediment. Let it stand for 2 minutes. Ⅱ. Pre-wet the nano-zirconia powder with a small amount of deionized water at a dosage of 20-30 g / L (powder:water = 1:3), stir into a paste, and slowly add it to the mixing tank. Adjust the stirring speed to 3000 r / min, and disperse at high speed for 30 minutes. Then place it in an ultrasonic disperser (300W power) and sonicate for 15 minutes. During the stirring process, stir once every 5 minutes until the powder is free of agglomeration and the solution is in a uniform suspension. Let it stand for 5 minutes without any sedimentation. III. Addition of antibacterial agent: Slowly add nano silver sol at a dosage of 5-10 g / L, and at the same time add penetrant JFC at a dosage of 0.5-1.0 g / L. Adjust the stirring speed to 1500 r / min and stir for 10 minutes to make the nano silver and nano zirconium oxide uniformly mixed to obtain the antibacterial far-infrared composite finishing solution for later use. A3: Covalent Grafting: I. Grafting System Preparation: Transfer the antibacterial far-infrared composite finishing solution prepared in A2 into a constant temperature reaction tank. Add trisodium citrate in three slow additions at a dosage of 2-4 g / L to the stirring tank, stirring for 3 minutes after each addition. Adjust the stirring speed to 1000 r / min, with a total stirring time of 10 minutes, to ensure the solution is evenly dispersed and free of lumps. II. Covalent Grafting Reaction: Place the yak wool modified in step A1 into the reaction tank, adjusting the bath ratio to 1:(25-30). First, raise the temperature to 50℃, then... Stir at low speed for 5 minutes, then heat to 55-60℃. Adjust the pH of the system to 5.5-6.5 with dilute acetic acid and continue stirring for 30-45 minutes. III. Post-grafting treatment: After the reaction is complete, take out the yak wool and wash it with deionized water at 35-40℃ for 10-15 minutes, changing the water twice during the process to ensure no grafting reagent residue remains. Place it in a hot air dryer and dry it at a low temperature of 50℃ until the fiber moisture regain reaches 8%-10%. Remove it and cool it to room temperature for later use.

[0012] A4: Crosslinking and Consolidation: I. Preparation of Low-Temperature Crosslinking and Consolidation System: Add deionized water to a low-temperature crosslinking reactor, add citric acid at a dosage of 8-12 g / L, and stir for 5 minutes until completely dissolved; then add sodium hypophosphite at a dosage of 4-6 g / L, and stir at 800... Stir at r / min for 8 min until homogeneous and set aside; II. Crosslinking and consolidation reaction: Immerse the yak wool fibers grafted in step A3 into the above crosslinking and consolidation system, adjust the bath ratio to 1:(30~35), close the reactor, first adjust the humidity to 60~75%RH, then slowly raise the temperature to 125~130℃, and react at constant temperature and humidity for 20~25 min, stirring once every 5 min to ensure uniform crosslinking in all parts of the fiber; III. Post-crosslinking treatment: After the reaction is completed, turn off the heating and wait for the temperature inside the reactor to drop below 60℃, then remove the yak wool fibers; wash with 30~35℃ deionized water 2~3 times to remove unreacted crosslinking reagents on the surface; place in a hot air dryer and dry at 45℃ until the moisture regain is 8%~10%, then gently comb to remove floating powder, and obtain antibacterial and heat-generating yak wool fibers.

[0013] The innovative antibacterial and heat-generating yak wool fiber adopts a four-step continuous process of "reduction modification - antibacterial far-infrared composite configuration - covalent grafting - low-temperature cross-linking and consolidation". The active sites of the fiber are activated by a specific reduction modification solution (sodium bisulfite + thiodiethanol), specific components are grafted, and low-temperature cross-linking and consolidation ensure the durability of the function, while not destroying the natural feel of yak wool. This solves the pain points of decreased mechanical properties and easy loss of function after yak wool modification.

[0014] Furthermore, the method for preparing the color-changing polyester filament is as follows: B1. Functional Monomer Grafting Base: Immerse polyester filaments in the grafting system at a liquor ratio of 1:30, at 65–75℃ and pH 4.0–5.0, stirring at 40–50 r / min for 40–50 min (nitrogen gas is used throughout the process to isolate oxygen), then wash and dry for later use; the grafting system is prepared with deionized water, and the components and concentrations are as follows: acrylic acid-maleic anhydride (mass ratio 2:1, total concentration 8–10 g / L), potassium persulfate 3–5 g / L, N,N-methylenebisacrylamide 1–2 g / L, and penetrant JFC 0.5–0.8 g / L; B2. In-situ composite preparation and grafting of dual-color-changing microcapsules: ① Core material preparation: Thermochromic core material (fluorescein-stearic acid, mass ratio 1:4) and photochromic core material (spiroxazine SO-2) were mixed at a mass ratio of 6:4 and dissolved in ethanol to prepare a core material solution; ② Microcapsule preparation: An oil phase was prepared by mixing the core material and composite wall material (PMMA-PU) at a mass ratio of 1:0.7, and then deionized water containing OP-10 (0.3~0.4%) and SDS (0.2~0.3%) was added dropwise. The mixture was emulsified at 1200~1500 r / min for 20~25 min to obtain an O / W emulsion; finally, azobisisobutyronitrile (0.5~1.0 g / L) was added at 55~65℃ and pH 5.0~5.5 and reacted for 80~100 min. After centrifugation, washing, drying, and sieving, dual-color-changing composite microcapsules were obtained; ③ Grafting: The dual-color-changing composite microcapsules were prepared by adding trisodium citrate (2-3 g / L) and OP-10 (0.3-0.4 g / L) to 7-10 wt% of polyester and sonicating at 300 W for 15 min. The spare polyester B1 was immersed in the dispersion at a bath ratio of 1:35, at 60-65℃ and pH 5.5-6.0, and stirred at 30-40 r / min for 70-80 min (under nitrogen protection). The mixture was then washed with water and dried. B3: Low-temperature synergistic crosslinking curing: The polyester filament grafted with B2 is immersed in the dual crosslinking system at a liquor ratio of 1:35, at 110~120℃, pH 5.5~6.5, and baking humidity of 65~70%RH, with a heating rate of 3℃ / min for 25~30min, followed by three-stage washing and drying to obtain the finished product; the dual crosslinking system is prepared by ultrasonication with deionized water, and the components and concentrations are: citric acid 6~8g / L, nano silica 2~3g / L, and sodium hypophosphite 4~5g / L.

[0015] The innovative color-changing polyester filament adopts a three-step process of "functional monomer grafting priming - in-situ composite grafting of dual color-changing microcapsules - low-temperature synergistic cross-linking curing" to prepare "temperature-induced + photo-induced" dual-response color-changing microcapsules (core material is fluorescein-stearic acid and spiroxazine SO-2, wall material is PMMA-PU), achieving dual color-changing effect. Furthermore, the grafting priming and dual cross-linking curing enhance the adhesion of the microcapsules, solving the problems of poor water resistance and short-lasting color-changing effect of color-changing polyester.

[0016] Furthermore, the moisture-absorbing and moisture-wicking nylon filament is a cross-shaped nylon filament with a surface having micropores, which has been chemically etched.

[0017] The microporous structure formed by chemical etching can improve the moisture absorption and wicking properties of nylon filaments, and the cross-section further enhances the moisture wicking efficiency.

[0018] Furthermore, the chemical etching involves immersing the cross-section nylon filaments in a composite etching system. The bath ratio during chemical etching is 1:(25-30), the reaction temperature is 45-55℃, the pH value is 11.5-12.5, and the reaction time is 25-35 min. The composite etching system is composed of 2-3% NaOH, 1-1.5% SDBS, and 0.3-0.5% PEG-6000 by mass fraction. After the chemical etching is completed, the cross-section nylon filaments are neutralized to a pH value of 6.5-7.5 with a 1-2% acetic acid solution, then washed with deionized water and dried to constant weight.

[0019] The chemical etching of cross-section nylon filaments employs a proprietary composite system (2~3% NaOH + 1~1.5% SDBS + 0.3~0.5% PEG-6000), coupled with precise process parameters (liquor ratio 1:25~30, temperature 45~55℃, etc.). Through SDBS dispersion and PEG-6000 protection, over-etching and uneven etching are avoided, precisely preparing a microporous structure suitable for the core yarn requirements, thus avoiding the over-etching caused by existing single NaOH etching systems.

[0020] Furthermore, the surface of the UV-resistant nylon filament is loaded with a 3-5 wt% nano-titanium dioxide-zinc oxide composite graft layer, wherein the mass ratio of nano-titanium dioxide to zinc oxide is 1:1.2.

[0021] Furthermore, the UV-resistant polyester filament contains 3 wt% nano-cerium dioxide and 5 wt% nano-titanium dioxide.

[0022] Compared with the prior art, the advantages of the present invention are as follows: The multifunctional yak wool fancy yarn fabric of the present invention has the following advantages: (1) This invention integrates six major functions: "heating, antibacterial, moisture absorption and wicking, high-efficiency UV protection, dual-response color change, and beautiful pattern". Each functional module achieves synergistic effect through structural design, raw material modification and process optimization, which not only ensures the stability of the fabric function, but also takes into account the mechanical properties and user experience of the fabric, breaking through the technical bottleneck of existing yak wool fabrics with single function and low added value.

[0023] (2) This invention adopts a double-layer composite structure combining a heat-generating antibacterial layer and a multi-colored UV-resistant layer. It achieves a tight connection through a specific weft knitting double-layer structure and adopts a 24-way loop forming system. The odd-numbered loop forming system feeds fancy yarns to weave the UV-resistant layer, and the even-numbered loops feed heat-generating antibacterial blended yarns to weave the heat-generating antibacterial layer. The double-layer structure effectively solves the connection strength and flatness of the double-layer fabric. It designs a three-layer structure fancy yarn with each layer functioning synergistically. The core yarn is a moisture-wicking nylon and spandex web-covered air-coated yarn. The decorative yarn is polyester section dyed yarn, color-changing polyester yarn, and UV-resistant nylon web-covered yarn. The fixing yarn is UV-resistant polyester and SORONA filament twisted together. Through the function of the yarn, the fabric has the elasticity of spandex, the beauty of color-changing polyester yarn and polyester section dyed yarn, and the functionality of UV-resistant yarn.

[0024] (3) The antibacterial and heat-generating yak wool fiber of the present invention adopts a four-step continuous process of “reduction modification - antibacterial far-infrared composite liquid preparation - covalent grafting - low temperature cross-linking and consolidation”. The active sites of the fiber are activated by a specific reduction modification liquid, specific components are grafted, and low temperature cross-linking and consolidation ensure the durability of the function. At the same time, it does not damage the natural feel of yak wool, and solves the pain points of decreased mechanical properties and easy loss of function after yak wool modification.

[0025] (4) The innovative three-step process of "functional monomer grafting base - in-situ composite grafting of dual color-changing microcapsules - low temperature synergistic cross-linking curing" is adopted for color-changing polyester filament to prepare "temperature-induced + photo-induced" dual-response color-changing microcapsules, achieve dual color-changing effect, and improve the adhesion of microcapsules through grafting base and dual cross-linking curing, thus solving the problems of poor water washability and short-lasting color-changing effect of color-changing polyester. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the fabric of the present invention.

[0027] Figure 2 This is a structural diagram of the weft-knitted double-layer structure of the present invention.

[0028] Figure 1 The middle layer consists of: 1. a heat-generating and antibacterial layer; and 2. a multi-colored UV-protective layer. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the embodiments. The embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention. Example 1

[0030] A multifunctional yak wool fancy yarn fabric includes a heat-generating and antibacterial layer 1 and a multi-colored UV-protective layer 2. The heat-generating and antibacterial layer 1 and the multi-colored UV-protective layer 2 are woven together by a weft-knitted double-layer structure. The weft-knitted double-layer structure includes a 24-way loop-forming system. In the odd-numbered loop-forming system, fancy yarn is fed in to form the multi-colored UV-protective layer 2. In the even-numbered loop-forming system, heat-generating and antibacterial blended yarn is fed in to form the heat-generating and antibacterial layer 1. The heat-generating and antibacterial blended yarn is a blended yarn with a fineness of 60S, which is made by uniformly mixing antibacterial and heat-generating yak wool fiber, modal fiber, and chitosan fiber in a weight ratio of 25:55:20.

[0031] The fancy yarn comprises: Core yarn: an air-covered yarn formed by combining a 30D moisture-wicking nylon filament and a 10D spandex filament on a web-bonding machine. Decorative yarn: a web-bonded yarn formed by combining a 30D polyester space-dyed filament, a 30D color-changing polyester filament, and a 30D UV-resistant nylon filament on a web-bonding machine. During the web-bonding process, airflow from the nozzles of the web-bonding machine creates web dots on the web-bonded yarn, with a density of 90 dots / m. Bonding yarn: formed by twisting a 30D UV-resistant polyester filament and a 20D SORONA filament together, with a twist of 20T / inch. The decorative yarn is evenly wrapped around the outside of the core yarn with an S-twist, and the bonding yarn is wrapped around the outside of the decorative yarn with a Z-twist at varying densities.

[0032] like Figure 2 As shown, the weft-knitted double-layer structure is knitted by two sections of needles on the upper needle plate and four sections of needles on the lower needle cylinder. The two sections of needles on the upper needle plate are arranged in the order A, B, A, B, and the four sections of needles on the lower needle cylinder are arranged in the order a, b, c, d. In the 24-way loop forming system, The triangular arrangement of the looping system in the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, and 23rd channels is as follows: upper needle plate non-looping triangle, non-looping triangle, lower syringe looping triangle, looping triangle, looping triangle, looping triangle; The triangular arrangement of the second and fourth loop forming systems is as follows: upper needle plate loop forming triangle, loop forming triangle, lower syringe floating line triangle, floating line triangle, floating line triangle, and tucking triangle; The triangular arrangement of the looping system in the 6th, 8th, 22nd, and 24th channels is as follows: upper needle plate looping triangle, looping triangle, lower syringe floating line triangle, floating line triangle, looping triangle, and floating line triangle; The triangular arrangement of the looping system in the 10th, 12th, 18th, and 20th channels is as follows: upper needle plate looping triangle, looping triangle, lower syringe floating line triangle, tucking triangle, floating line triangle, floating line triangle; The triangular arrangement of the 14th and 16th loop forming systems is as follows: upper needle plate loop forming triangle, loop forming triangle, lower needle cylinder loop forming triangle, floating line triangle, floating line triangle, floating line triangle; The odd-numbered loop knitting system has a yarn length of 22cm / 100 needles, and the even-numbered loop knitting system has a yarn length of 21.5cm / 100 needles. The even-numbered loop knitting system forms a honeycomb mesh structure, which improves the breathability and wearing comfort of the fabric when in contact with the human body. The fabric is knitted on a 46-inch 32-needle double-sided knitting machine.

[0033] It adopts a double-layer composite structure combining a heat-generating antibacterial layer and a colorful UV-protective layer. The tight connection is achieved through a specific weft knitting double-layer structure. It adopts a 24-way loop forming system, with odd-numbered ways of feeding fancy yarns to weave the UV-protective layer and even-numbered ways of feeding heat-generating antibacterial blended yarns to weave the heat-generating antibacterial layer. The double-layer structure effectively solves the connection strength and flatness of the double-layer fabric.

[0034] The design incorporates a three-layer fancy yarn structure, with each layer functioning synergistically. The core yarn is a web-bonded yarn of moisture-wicking nylon and spandex, while the decorative yarn consists of a web of polyester space-dyed yarn, color-changing polyester yarn, and UV-resistant nylon yarn. The binding yarn is made of UV-resistant polyester and SORONA filament twisted together. Through the function of the yarns, the fabric possesses the elasticity of spandex, the aesthetic appeal of color-changing polyester yarn and polyester space-dyed yarn, and the functionality of UV-resistant yarn.

[0035] The preparation method of antibacterial and heat-generating yak wool fiber includes the following steps: A1: Yak Wool Reduction Modification: I. Preparation of Reduction Modification Solution: First, inject deionized water into a constant temperature reaction tank, add 1~2g / L of penetrant JFC, and stir for 5 minutes until uniformly mixed; then, add 9~12g / L of sodium bisulfite and 6~8g / L of thiodiethanol sequentially, and stir at 800r / min for 10 minutes; finally, adjust the pH of the system to 8.0~8.5 with sodium hydroxide and set aside; II. Yak Wool Impregnation: Immerse the pretreated and opened yak wool fibers in the prepared reduction modification solution at a bath ratio of 1:(25~30), adjust the reaction temperature to 48~52℃ (constant temperature fluctuation ≤±1℃), and stir at 60~80 Stir the reaction at a low speed of r / min for 30-35 minutes. Stop stirring at the end of the reaction (last 5 minutes), keep it warm and let it stand to ensure that the fibers fully absorb the modified solution; III. Formation of modified yak wool: Take out the reacted yak wool fibers and wash them repeatedly with deionized water at 35-40℃ 3-4 times until the washing solution is neutral (pH=6.5-7.5); put them into a hot air dryer and dry them at a low temperature of 45-50℃ until the fiber moisture regain reaches 8%-10%. Take them out, cool them to room temperature, and seal them for later use.

[0036] A2: Preparation of Antibacterial Far-Infrared Composite Finishing Solution: Ⅰ. Basic Preparation: Add a measured amount of deionized water to the mixing tank, and add sodium polyacrylate (dispersant) at a dosage of 1-2 g / L. Stir at a constant speed of 1000 r / min for 10 minutes to form a uniform and transparent mixture without sediment. Let it stand for 2 minutes. Ⅱ. Pre-wet the nano-zirconia powder with a small amount of deionized water at a dosage of 20-30 g / L (powder:water = 1:3), stir into a paste, and slowly add it to the mixing tank. Adjust the stirring speed to 3000 r / min, and disperse at high speed for 30 minutes. Then place it in an ultrasonic disperser (300W power) and sonicate for 15 minutes. Stir every 5 minutes until the powder is free of agglomeration and the solution is in a uniform suspension. Let stand for 5 minutes until no sedimentation occurs. III. Addition of antibacterial agent: Slowly add nano silver sol at a dosage of 5-10 g / L, and at the same time add penetrant JFC at a dosage of 0.5-1.0 g / L. Adjust the stirring speed to 1500 r / min and stir for 10 minutes to make the nano silver and nano zirconium oxide uniformly mixed to obtain antibacterial far-infrared composite finishing solution for later use.

[0037] A3: Covalent Grafting: I. Grafting System Preparation: Transfer the antibacterial far-infrared composite finishing solution prepared in A2 into a constant temperature reaction tank. Add trisodium citrate in three slow additions at a dosage of 2-4 g / L to the stirring tank, stirring for 3 minutes after each addition. Adjust the stirring speed to 1000 r / min, with a total stirring time of 10 minutes, to ensure the solution is evenly dispersed and free of lumps. II. Covalent Grafting Reaction: Place the yak wool modified in step A1 into the reaction tank, adjusting the bath ratio to 1:(25-30). First, raise the temperature to 50℃, then... Stir at low speed for 5 minutes, then heat to 55-60℃. Adjust the pH of the system to 5.5-6.5 with dilute acetic acid and continue stirring for 30-45 minutes. III. Post-grafting treatment: After the reaction is complete, take out the yak wool and wash it with deionized water at 35-40℃ for 10-15 minutes, changing the water twice during the process to ensure no grafting reagent residue remains. Place it in a hot air dryer and dry it at a low temperature of 50℃ until the fiber moisture regain reaches 8%-10%. Remove it and cool it to room temperature for later use.

[0038] A4: Crosslinking and Consolidation: I. Preparation of Low-Temperature Crosslinking and Consolidation System: Add deionized water to a low-temperature crosslinking reactor, add citric acid at a dosage of 8-12 g / L, and stir for 5 minutes until completely dissolved; then add sodium hypophosphite at a dosage of 4-6 g / L, and stir at 800... Stir at r / min for 8 min until homogeneous and set aside; II. Crosslinking and consolidation reaction: Immerse the yak wool fibers grafted in step A3 into the above crosslinking and consolidation system, adjust the bath ratio to 1:(30~35), close the reactor, first adjust the humidity to 60~75%RH, then slowly raise the temperature to 125~130℃, and react at constant temperature and humidity for 20~25 min, stirring once every 5 min to ensure uniform crosslinking in all parts of the fiber; III. Post-crosslinking treatment: After the reaction is completed, turn off the heating and wait for the temperature inside the reactor to drop below 60℃, then remove the yak wool fibers; wash with 30~35℃ deionized water 2~3 times to remove unreacted crosslinking reagents on the surface; place in a hot air dryer and dry at 45℃ until the moisture regain is 8%~10%, then gently comb to remove floating powder, and obtain antibacterial and heat-generating yak wool fibers.

[0039] The innovative antibacterial and heat-generating yak wool fiber adopts a four-step continuous process: "reduction modification - antibacterial far-infrared composite liquid preparation - covalent grafting - low-temperature cross-linking and consolidation". The active sites of the fiber are activated by a specific reduction modification liquid (sodium bisulfite + thiodiethanol), specific components are grafted, and low-temperature cross-linking and consolidation ensure the durability of the function, while not destroying the natural feel of yak wool. This solves the pain points of decreased mechanical properties and easy loss of function after yak wool modification.

[0040] The preparation method of color-changing polyester filament is as follows: B1. Functional Monomer Grafting Base: Immerse polyester filaments in the grafting system at a liquor ratio of 1:30, at 65–75℃ and pH 4.0–5.0, and stir at 40–50 r / min for 40–50 min (nitrogen gas is used throughout the process to isolate oxygen). Wash with water and dry for later use. The grafting system is prepared with deionized water, and the components and concentrations are as follows: acrylic acid-maleic anhydride (mass ratio 2:1, total concentration 8–10 g / L), potassium persulfate 3–5 g / L, N,N-methylenebisacrylamide 1–2 g / L, and penetrant JFC 0.5–0.8 g / L.

[0041] B2. In-situ composite preparation and grafting of dual-color-changing microcapsules: ① Core material preparation: Thermochromic core material (fluorescein-stearic acid, mass ratio 1:4) and photochromic core material (spiroxazine SO-2) were mixed at a mass ratio of 6:4 and dissolved in ethanol to prepare a core material solution; ② Microcapsule preparation: An oil phase was prepared by mixing the core material and composite wall material (PMMA-PU) at a mass ratio of 1:0.7, and then deionized water containing OP-10 (0.3~0.4%) and SDS (0.2~0.3%) was added dropwise. The mixture was emulsified at 1200~1500 r / min for 20~25 min to obtain an O / W emulsion; finally, azobisisobutyronitrile (0.5~1.0 g / L) was added at 55~65℃ and pH 5.0~5.5 and reacted for 80~100 min. After centrifugation, washing, drying, and sieving, dual-color-changing composite microcapsules were obtained; ③ Grafting: The dual-color-changing composite microcapsules were prepared by adding trisodium citrate (2-3 g / L) and OP-10 (0.3-0.4 g / L) to 7-10 wt% of polyester and sonicating at 300W for 15 min. The spare polyester B1 was immersed in the dispersion at a bath ratio of 1:35 and stirred at 30-40 r / min for 70-80 min at 60-65℃ and pH 5.5-6.0 (under nitrogen protection). The mixture was then washed with water and dried.

[0042] B3: Low-temperature synergistic crosslinking curing: The polyester filament grafted with B2 is immersed in the dual crosslinking system at a liquor ratio of 1:35, at 110~120℃, pH 5.5~6.5, and baking humidity of 65~70%RH, with a heating rate of 3℃ / min for 25~30min, followed by three-stage washing and drying to obtain the finished product; the dual crosslinking system is prepared by ultrasonication with deionized water, and the components and concentrations are: citric acid 6~8g / L, nano silica 2~3g / L, and sodium hypophosphite 4~5g / L.

[0043] The innovative color-changing polyester filament adopts a three-step process of "functional monomer grafting priming - in-situ composite grafting of dual color-changing microcapsules - low-temperature synergistic cross-linking curing" to prepare "temperature-induced + photo-induced" dual-response color-changing microcapsules (core material is fluorescein-stearic acid and spiroxazine SO-2, wall material is PMMA-PU), achieving dual color-changing effect. Furthermore, the grafting priming and dual cross-linking curing enhance the adhesion of the microcapsules, solving the problems of poor water resistance and short-lasting color-changing effect of color-changing polyester.

[0044] The moisture-wicking nylon filament is a cross-section nylon filament with micropores on its surface, which has been chemically etched. The chemical etching involves immersing the cross-section nylon filament in a composite etching system. The bath ratio during chemical etching is 1:(25-30), the reaction temperature is 45-55℃, the pH value is 11.5-12.5, and the reaction time is 25-35 min. The composite etching system is composed of 2-3% NaOH, 1-1.5% SDBS, and 0.3-0.5% PEG-6000 by mass fraction. After the chemical etching is completed, the cross-section nylon filament is neutralized to a pH value of 6.5-7.5 with a 1-2% acetic acid solution, then washed with deionized water and dried to constant weight.

[0045] The chemical etching of cross-section nylon filaments employs a proprietary composite system (2~3% NaOH + 1~1.5% SDBS + 0.3~0.5% PEG-6000), coupled with precise process parameters (liquor ratio 1:25~30, temperature 45~55℃, etc.). Through SDBS dispersion and PEG-6000 protection, over-etching and uneven etching are avoided, precisely preparing a microporous structure suitable for the core yarn requirements, thus avoiding the over-etching caused by existing single NaOH etching systems.

[0046] The surface of the UV-resistant nylon filament is loaded with a 3-5 wt% nano-titanium dioxide-zinc oxide composite graft layer, wherein the mass ratio of nano-titanium dioxide to zinc oxide is 1:1.2, and the UV-resistant polyester filament contains 3 wt% nano-cerium dioxide and 5 wt% nano-titanium dioxide.

[0047] The antibacterial properties of the fabric in the embodiments of the present invention were tested according to GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Vibration method", and the test results are shown in Table 1.

[0048] Table 1: Antibacterial Performance Test Data of Fabrics

[0049] As can be seen from Table 1, the fabric of the present invention exhibits good inhibitory properties against Escherichia coli, Staphylococcus aureus, and Candida albicans after being washed 50 times.

[0050] The far-infrared emission performance and far-infrared radiation temperature rise performance of the fabric in the embodiments of the present invention were tested in accordance with GB / T 30127-2013 "Test and evaluation of far-infrared performance of textiles". The test results are shown in Table 2.

[0051] Table 2: Test data on the far-infrared heating performance of the fabric

[0052] As can be seen from Table 2, the fabric of the present invention still has good far-infrared emissivity and far-infrared heating performance after being washed 50 times.

[0053] The UV protection performance of the fabric in this embodiment of the invention was tested according to GB / T 18830-2009 "Evaluation of UV Protection Performance of Textiles". The test results are shown in Table 3.

[0054] Table 3: UV protection performance test data of the fabric

[0055] As can be seen from Table 3, the fabric of the present invention still has good UV protection performance after being washed 50 times.

[0056] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A yak wool fancy yarn woven fabric, characterized in that: The fabric has a heat-generating and antibacterial layer (1) on one side and a multi-colored UV-protective layer (2) on the other side. The heat-generating and antibacterial layer (1) and the multi-colored UV-protective layer (2) are woven together by a weft-knitted double-layer structure. The weft-knitted double-layer structure includes a 24-way loop-forming system. In the odd-numbered loop-forming system, fancy yarns are fed in to form the multi-colored UV-protective layer (2). In the even-numbered loop-forming system, heat-generating and antibacterial blended yarns are fed in to form the heat-generating and antibacterial layer (1). The heat-generating and antibacterial blended yarns are spun from a uniform mixture of antibacterial and heat-generating yak wool fiber / modal fiber / chitosan fiber in a weight ratio of (25-30):(55-60):(10-20). The fancy yarns include... Core yarn: As the main yarn, it is an air-covered yarn formed by connecting a moisture-absorbing and moisture-wicking nylon filament and a spandex filament on a connecting yarn machine; Decorative yarn: Twisted and wound on the core yarn, it is a combined yarn formed by combining a polyester space-dyed filament, a color-changing polyester filament, and a UV-resistant nylon filament on a combined yarn forming machine. During the combined yarn forming process, the airflow from the nozzle of the combined yarn forming network points is used to form network points on the combined yarn, with a network point density of 80-100 points / m. Fixed yarn: It is wrapped around the outer periphery of the decorative yarn with opposite twist direction. It is made of a UV-resistant polyester filament and a SORONA filament twisted together. The twist of the UV-resistant polyester filament and the SORONA filament is 15~20T / inch.

2. The yak wool fancy yarn woven fabric according to claim 1, characterized in that: The weft-knitted double-layer structure is woven using two sections of needles on the upper needle plate and four sections of needles on the lower needle cylinder. The odd-numbered loop-forming system uses 22cm / 100 needles, and the even-numbered loop-forming system uses 21.5cm / 100 needles. The even-numbered loop-forming system forms a honeycomb mesh structure. The fabric is woven on a 46-inch 32-gauge double-sided knitting machine. The two sections of needles on the upper needle plate are arranged in the order A, B, A, B, and the four sections of needles on the lower needle cylinder are arranged in the order a, b, c, d. In the 24-loop-forming system: The triangular arrangement of the looping system in the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, and 23rd channels is as follows: upper needle plate non-looping triangle, non-looping triangle, lower syringe looping triangle, looping triangle, looping triangle, looping triangle; The triangular arrangement of the second and fourth loop forming systems is as follows: upper needle plate loop forming triangle, loop forming triangle, lower syringe floating line triangle, floating line triangle, floating line triangle, and tucking triangle; The triangular arrangement of the looping system in the 6th, 8th, 22nd, and 24th channels is as follows: upper needle plate looping triangle, looping triangle, lower syringe floating line triangle, floating line triangle, looping triangle, and floating line triangle; The triangular arrangement of the looping system in the 10th, 12th, 18th, and 20th channels is as follows: upper needle plate looping triangle, looping triangle, lower syringe floating line triangle, tucking triangle, floating line triangle, floating line triangle; The triangular arrangement of the 14th and 16th loop forming systems is as follows: upper needle plate loop forming triangle, loop forming triangle, lower needle cylinder tucking triangle, floating line triangle, floating line triangle, floating line triangle.

3. The yak wool fancy yarn woven fabric according to claim 1, characterized in that: The preparation method of the antibacterial and heat-generating yak wool fiber: A1: Yak wool reduction modification: I. Preparation of reduction modification solution: First, inject deionized water into the constant temperature reaction tank, add 1~2g / L of penetrant JFC, and stir for 5min until uniformly mixed; then, add 9~12g / L of sodium bisulfite and 6~8g / L of thiodiethanol in sequence, and stir evenly; adjust the pH of the system to 8.0~8.5 and set aside for later use; II. Yak wool impregnation: Immerse the pretreated and opened yak wool fibers in the prepared reduction modification solution at a bath ratio of 1:(25~30). Adjust the reaction temperature to 48~52℃, maintain a constant temperature fluctuation of ≤±1℃, and stir for 30~35 minutes. Stop stirring for the last 5 minutes of the reaction, keep warm and let stand to allow the fibers to fully absorb the modification solution. III. Formation of modified yak wool: Take out the reacted yak wool fibers and wash them repeatedly with deionized water at 35~40℃ 3~4 times until the washing solution is neutral. Dry them at a low temperature of 45~50℃ until the fiber moisture regain reaches 8%~10%. Take them out, cool them to room temperature, and seal them for later use. A2: Preparation of Antibacterial Far-Infrared Composite Finishing Solution: Ⅰ. Basic Preparation: Add a measured amount of deionized water to a mixing tank, add sodium polyacrylate at a dosage of 1-2 g / L, stir to form a precipitate-free, uniform, and transparent mixture, and let it stand for later use; Ⅱ. Pre-wet the nano-zirconia powder with deionized water at a weight ratio of 1:3 (powder:deionized water), and stir to form a paste; then slowly add it to the mixing tank at a dosage of 20-30 g / L, stirring, shearing, and ultrasonic dispersion until the powder is free of agglomeration and the solution is in a uniform suspension state. Let it stand for 5 minutes until no precipitation occurs; Ⅲ. Addition of Antibacterial Agent: Slowly add nano-silver sol at a dosage of 5-10 g / L, and simultaneously add penetrant JFC at a dosage of 0.5-1.0 g / L. Stir to uniformly mix the nano-silver and nano-zirconia to obtain the antibacterial far-infrared composite finishing solution, and set it aside for later use; A3: Covalent Grafting: I. Grafting System Preparation: Transfer the antibacterial far-infrared composite finishing solution prepared in step A2 into a constant temperature reaction tank. Add trisodium citrate in three slow additions at a dosage of 2-4 g / L to the stirring tank, stirring until the solution is evenly dispersed and free of lumps; II. Covalent Grafting Reaction: Place the yak wool modified in step A1 into the reaction tank. The bath ratio is 1:(25-30). First, raise the temperature to 50℃, then... Stir at low speed (r / min) for 5 minutes, then heat to 55-60℃. Adjust the pH of the system to 5.5-6.5 with dilute acetic acid, and continue stirring for 30-45 minutes. Ⅲ. Post-grafting treatment: After the reaction is complete, remove the yak wool and wash it with deionized water at 35-40℃ for 10-15 minutes, changing the water frequently to ensure no grafting reagent residue remains. Place it in a hot air dryer and dry at 50℃ until the fiber moisture regain reaches 8%-10%. Remove and cool to room temperature for later use. A4: Crosslinking and consolidation: I. Preparation of low-temperature crosslinking and consolidation system: Add deionized water to the low-temperature crosslinking reactor, add citric acid at a dosage of 8~12g / L, and stir until completely dissolved; then add sodium hypophosphite at a dosage of 4~6g / L, stir and mix evenly, and set aside. II. Crosslinking and consolidation reaction: Immerse the grafted yak wool fibers from step A3 into the above crosslinking and consolidation system, adjust the bath ratio to 1:(30~35), close the reactor, first adjust the humidity to 60~75%RH, then slowly raise the temperature to 125~130℃, and react at a constant temperature and humidity for 20~25 minutes, stirring intermittently to ensure uniform crosslinking of all parts of the fiber; III. Post-crosslinking treatment: After the reaction is completed, turn off the heating, and when the temperature inside the reactor drops below 60℃, remove the yak wool fibers; wash 2~3 times with deionized water at 30~35℃ to remove unreacted crosslinking reagents on the surface; place in a hot air dryer and dry at a low temperature of 45~50℃ until the moisture regain is 8%~10%, remove and gently comb to remove floating powder, and obtain antibacterial and heat-generating yak wool fibers.

4. The yak wool fancy yarn woven fabric according to claim 1, characterized in that: The method for preparing the color-changing polyester filament: B1. Functional Monomer Grafting Base: Immerse polyester filaments in the grafting system, and stir for 40-50 minutes at a liquor ratio of 1:30, 65-75℃, and pH 4.0-5.

0. The reaction is carried out under nitrogen to prevent oxygen depletion. After washing and drying, the filaments are ready for use. The grafting system is prepared with deionized water, and its components and concentrations are as follows: acrylic acid-maleic anhydride: mass ratio 2:1, total concentration 8-10 g / L, potassium persulfate 3-5 g / L, N,N-methylenebisacrylamide 1-2 g / L, and penetrant JFC 0.5-0.8 g / L. B2. In-situ composite preparation and grafting of dual-color-changing microcapsules: ① Core material preparation: Thermochromic core material and photochromic core material are mixed at a mass ratio of 6:(4~2), and dissolved in ethanol to prepare core material solution. The thermochromic core material is fluorescein-stearic acid at a mass ratio of 1:4, and the photochromic core material is spiroxazine SO-2; ② Microcapsule preparation: The core material and composite wall material are mixed at a mass ratio of 1:0.7 to prepare oil phase, and then deionized water containing 0.3~0.4wt% OP-10 and 0.2~0.3wt% SDS is added dropwise. After stirring and emulsifying for 20~25min, an O / W emulsion is obtained; finally, azobisisobutyronitrile is added at 55~65℃ and pH 5.0~5.5 for 80~100min, with an addition concentration of 0.5~1.0g / L. After centrifugation, washing, drying, and sieving, dual-color-changing composite microcapsules are obtained; ③ Grafting: The dual-color-changing composite microcapsules are prepared by adding trisodium citrate and OP-10 at a concentration of 2-3 g / L for trisodium citrate and 0.3-0.4 g / L for OP-10, according to 7-10 wt% of polyester. The spare polyester B1 is immersed in the dispersion at a bath ratio of 1:35, at 60-65℃ and pH 5.5-6.0, and stirred for reaction. Nitrogen gas is purged during the reaction to prevent oxygen deprivation. The mixture is then washed with water and dried. B3: Low-temperature synergistic crosslinking curing: The polyester filament grafted with B2 is immersed in the dual crosslinking system at a liquor ratio of 1:35, at 110~120℃, pH 5.5~6.5, and baking humidity of 65~70%RH, with a heating rate of 3~5℃ / min for 25~30min, followed by three-stage washing and drying to obtain the finished product; the dual crosslinking system is prepared by ultrasonication with deionized water, and the components and concentrations are: citric acid 6~8g / L, nano silica 2~3g / L, and sodium hypophosphite 4~5g / L.

5. The yak wool fancy yarn woven fabric according to claim 1, characterized in that: The moisture-absorbing and wicking nylon filament is a cross-shaped nylon filament with a microporous surface that has been chemically etched.

6. The yak wool fancy yarn woven fabric according to claim 5, characterized in that: Chemical etching involves immersing cross-section nylon filaments in a composite etching system. The bath ratio during chemical etching is 1:(25-30), the reaction temperature is 45-55℃, the pH value is 11.5-12.5, and the reaction time is 25-35 min. The composite etching system is composed of 2-3% NaOH, 1-1.5% SDBS, and 0.3-0.5% PEG-6000 by mass fraction. After the chemical etching is completed, the cross-section nylon filaments are neutralized to a pH value of 6.5-7.5 with a 1-2% acetic acid solution, then washed with deionized water and dried to constant weight.

7. The yak wool fancy yarn woven fabric according to claim 1, characterized in that: The surface of the UV-resistant nylon filament is loaded with a 3-5 wt% nano-titanium dioxide-zinc oxide composite graft layer, wherein the mass ratio of nano-titanium dioxide to zinc oxide is 1:(1.2-1.5).

8. The yak wool fancy yarn woven fabric according to claim 1, characterized in that: The UV-resistant polyester filament contains 3 wt% nano-cerium dioxide and 5 wt% nano-titanium dioxide.

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