Cool fabric based on nylon and spandex blending and preparation process thereof

Abstract

The invention relates to the technical field of functional fabrics, and particularly discloses a cool fabric based on nylon and spandex blending and a preparation process thereof.The nylon and spandex blending is obtained by weaving blended yarn and covering yarn, the blended yarn is obtained by blending linen fiber and bamboo fiber, the covering yarn uses modified spandex fiber as core yarn, and the modified spandex fiber is used as core yarn. The modified nylon fiber and the bamboo fiber are blended to serve as wrapping yarn, the modified spandex fiber is obtained by reacting aminated spandex fiber and epoxidized boron nitride, and the modified nylon fiber is obtained by blending and spinning modified zinc oxide, nylon 6 slices and an antioxidant. The fabric is obvious in contact instant and continuous cool feeling, absorbs moisture, is quick to dry, effectively reduces the body surface temperature, improves the wearing comfort, and has wide application prospects in the fields of clothes, home textiles and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of functional fabrics, in particular to a nylon-spandex blended cool fabric and a preparation process thereof. Background Art

[0002] In the textile fabric sector, cooling fabrics are gaining popularity as consumers' demands for comfort continue to rise. Traditional cooling fabrics often achieve cooling through post-finishing coatings or the addition of thermally conductive mineral particles. However, these fabrics suffer from poor washability, insufficient cooling duration, high cost, poor breathability, and insufficient elasticity, making them unable to simultaneously meet consumer demands for a cool touch, comfortable wearing experience, and good durability. Nylon, while possessing high strength and abrasion resistance, suffers from poor moisture absorption and breathability. Spandex, a highly elastic fiber, imparts elasticity to fabrics but struggles to provide a cooling effect on its own.

[0003] In the prior art, there have been many studies on cool fabrics, but there are still many deficiencies. Chinese patent application CN106149163A discloses a dyeing and finishing method for a cool yarn and a spandex plain fabric thereof. The cool yarn uses nylon and rayon as raw materials, and nano-scale mica powder is added to the spinning solution to obtain nylon cool yarn and rayon cool yarn. The cool yarn is obtained by network paralleling, and has high thermal conductivity and good moisture absorption and quick-drying performance. However, the fabric is not elastic and breathable enough. Only 0.08-0.12% of nano-scale mica powder is added, and the cooling effect is limited. Moreover, it is only dispersed in the fiber through physical mixing, and it easily falls off during washing, affecting the durability of the cool feeling. Chinese patent application CN115124831A discloses a cool nylon blend and its application. The cool nylon blend uses granular aluminum nitride and flaky boron nitride to form a filler network structure, improves the thermal conductivity of the composite cool masterbatch, so that it can obtain a good continuous cooling effect at a lower content, and ensures the good spinnability of the blend. The special-shaped cool nylon fiber prepared by the combined spinning has excellent cooling effect and good moisture absorption and perspiration effect, but the randomly mixed granular aluminum nitride and flaky boron nitride are prone to clustering due to shape differences, uneven dispersion in the fabric, forming discontinuous heat conduction paths, resulting in unstable cooling performance, and weak adsorption between the filler and the nylon molecular chain. Interface debonding is prone to occur during processing, affecting the comprehensive performance of the fabric. Chinese patent application CN118996834A discloses a cool shirt with perspiration-wicking and breathable functions and a method for making the same. Fabrics of different parts are sewn together to form a finished shirt, which is then sprayed with a cooling finishing liquid for a cool feeling. The resulting cool shirt has a natural cool feeling, absorbs moisture quickly, and maintains a lasting freshness. However, the cooling finishing liquid easily falls off after repeated washings, resulting in a poorly lasting cool feeling.

[0004] In summary, the cooling fabrics in the prior art have deficiencies in terms of cooling durability, elasticity, breathability, and washability, making it difficult to simultaneously meet the diverse needs of consumers. Therefore, it is of great significance to develop a cooling fabric made of nylon and spandex blends that has excellent cooling performance, good elasticity, breathability, and washability.

[0005] Summary of the invention (1) Technical problems solved In view of the deficiencies in the prior art, the present invention provides a cooling fabric based on a nylon-spandex blend and a preparation process thereof, which solves the problems of poor cooling durability and general air permeability of cooling fabrics.

[0006] (2) Technical solution In order to achieve the above-mentioned purpose, the present invention discloses a preparation process of a nylon-spandex blended cool fabric, comprising the following steps: blending flax fiber and bamboo fiber as warp yarn, using modified spandex fiber as core yarn, blending the modified nylon fiber and bamboo fiber as outer covering yarn, blending the core yarn and the outer covering yarn to obtain core-spun yarn, using the core-spun yarn as weft yarn, and weaving the warp yarn and the weft yarn through warp and weft to obtain the nylon-spandex blended cool fabric.

[0007] The weight of the cool fabric is 125-145g / m 2 .

[0008] As a further solution of the present invention: during the preparation of the warp yarn, the flax fibers are first softened and combed.

[0009] As a further embodiment of the present invention, the flax fibers are long flax fibers with a fineness of 5-10 dtex and an average length of >65 mm.

[0010] As a further solution of the present invention: the bamboo fiber has a fineness of 2-4 dtex, which can provide a softer feel and a better cool feeling.

[0011] As a further solution of the present invention: in the warp yarn, the mass ratio of flax fiber to bamboo fiber is 3:2; in the core-spun yarn, the mass ratio of modified nylon fiber to bamboo fiber is 4:1, and the core yarn accounts for 16wt%~18wt% of the core-spun yarn.

[0012] As a further solution of the present invention: the imperial count of the warp yarn is 40-50Ne, and the imperial count of the weft yarn is 60-70Ne; the warp yarn density is 152-178 strands / inch, and the weft yarn density is 114-140 strands / inch.

[0013] As a further embodiment of the present invention, the method for preparing the modified spandex fiber comprises the following steps: B1. Ultrasonic dispersion of hydroxylated nano-boron nitride in toluene, mixing well, adding γ-glycidyloxypropyltrimethoxysilane, heating, reacting at 80-90°C for 10-12 hours, filtering, washing with anhydrous ethanol, and vacuum drying at 60°C for 12 hours to obtain epoxide boron nitride; B2. Immersing the spandex fiber in a sodium hydroxide solution, heating it at 90° C. for 2 h, washing it with deionized water until it becomes neutral, then washing it with acetone, immersing it in a mixture of γ-aminopropyltriethoxysilane and anhydrous ethanol, immersing it at room temperature for 24 h, washing it with deionized water, and drying it at 60° C. for 12 h to obtain an amino-modified spandex fiber; B3. Ultrasonic disperse epoxide boron nitride in N-methylpyrrolidone, mix well, add amino spandex fiber and triethylamine, heat, stir, and react in a nitrogen atmosphere. After the reaction is completed, take out, wash with anhydrous ethanol, deionized water, and acetone, and dry at 60°C for 12 hours to obtain modified spandex fiber.

[0014] As a further solution of the present invention: the mass ratio of hydroxylated nano-boron nitride, toluene, and γ-glycidyloxypropyltrimethoxysilane in B1 is 100: (2500-3000): (120-200).

[0015] As a further solution of the present invention: The preparation method of the hydroxylated nano-boron nitride in B1 is as follows: 1 g of nano-boron nitride is ultrasonically dispersed in 100 mL of 2 mol / L sodium hydroxide solution, mixed, transferred to a three-necked flask, heated in a water bath, stirred and reacted at 60°C for 12 h, filtered, washed with deionized water, and dried at 60°C for 12 h to obtain hydroxylated nano-boron nitride.

[0016] As a further solution of the present invention: the mass ratio of the spandex fiber, γ-aminopropyltriethoxysilane and anhydrous ethanol in B2 is 100: (10-14): (1200-2000).

[0017] As a further solution of the present invention: the concentration of the sodium hydroxide solution in B2 is 0.3 mol / L.

[0018] As a further embodiment of the present invention, the mass ratio of epoxide boron nitride, N-methylpyrrolidone, amino-stranded spandex fiber, and triethylamine in B3 is (3-8): (500-900): 100: (0.1-0.2), the reaction temperature is 50-60° C., and the reaction time is 12-18 h.

[0019] As a further embodiment of the present invention, the method for preparing the modified nylon fiber comprises the following steps: A1. Ultrasonic dispersion of nano zinc oxide in toluene. After uniform dispersion, γ-methacryloxypropyltrimethoxysilane was added, and the mixture was heated and stirred to react. After the reaction was completed, the mixture was centrifuged, washed with anhydrous ethanol, and vacuum dried at 60°C for 24 hours to obtain olefinated zinc oxide. A2. Ultrasonic dispersion of olefinated nano-zinc oxide in xylene. After uniform dispersion, maleic anhydride and initiator are added, stirred and mixed, heated, reacted at 60-70°C for 4-6 hours, filtered, washed with acetone, and vacuum dried at 60°C for 24 hours to obtain modified zinc oxide; A3. Modified zinc oxide, nylon 6 chips and antioxidant are mixed and added into a twin-screw extruder for melt blending and extrusion. The melt enters a spinning machine through a metering pump, is ejected through a spinneret, and is cooled to obtain modified nylon fiber.

[0020] As a further solution of the present invention: the mass ratio of nano zinc oxide, toluene, and γ-methacryloxypropyltrimethoxysilane in A1 is 100: (1800-2100): (12-20).

[0021] As a further embodiment of the present invention: the reaction temperature in A1 is 85-95° C., and the reaction time is 6-8 h.

[0022] As a further embodiment of the present invention, the mass ratio of olefinated nano-zinc oxide, xylene, maleic anhydride and initiator in A2 is 100: (1500-1600): (24-35): (0.5-1).

[0023] As a further embodiment of the present invention: the initiator in A2 is dibenzoyl peroxide.

[0024] As a further embodiment of the present invention, the mass ratio of the modified zinc oxide, nylon 6 chips, and antioxidant in A3 is (1-6):100:(0.1-0.3).

[0025] As a further embodiment of the present invention: the temperature of melt blending in A3 is 250-260°C.

[0026] As a further solution of the present invention: the drafting ratio in A3 is 3.5 times to obtain modified nylon fiber.

[0027] As a further solution of the present invention: the modified nylon fiber in A3 has a fineness of 40 dtex.

[0028] As a further solution of the present invention: the antioxidant in A3 is antioxidant 1010.

[0029] A cool fabric based on a nylon-spandex blend is prepared by any one of the methods for preparing a cool fabric based on a nylon-spandex blend.

[0030] (3) Beneficial technical effects Compared with the prior art, the present invention has the following beneficial effects: (1) In the present invention, nano zinc oxide is modified to obtain olefinic zinc oxide, which is polymerized with maleic anhydride under the action of an initiator to obtain modified zinc oxide. The modified zinc oxide is melt-blended with nylon 6 chips, and the carboxyl groups in the modified zinc oxide react with the amino groups at the end of nylon to achieve uniform distribution of particles, effectively avoiding agglomeration and dissolution. The modified nylon fiber is prepared by spinning. Nano zinc oxide can give fabrics long-lasting antibacterial properties, and the nanoparticles reflect ultraviolet rays to reduce heat accumulation. The modified nylon fiber realizes a continuous heat conduction path, has excellent heat transfer efficiency, can improve the cool feeling of the fabric, and the introduced hydrophilic groups can effectively improve the hygroscopicity of the fabric. (2) In the present invention, hydroxylated nano-boron nitride is modified by introducing epoxy groups on its surface to obtain epoxidized boron nitride, and γ-aminopropyltriethoxysilane is used to modify spandex fiber to obtain amino-stranded spandex fiber. Epoxidized boron nitride and amino-stranded spandex fiber are mixed and reacted under the action of a catalyst to form a covalent network structure. Nanoparticles are orderly distributed to obtain modified spandex fiber. High thermal conductivity filler nano-boron nitride can improve the heat dissipation efficiency of fabrics, reduce body temperature, and has good dispersion in the fiber to form a thermal conductive network, thereby improving thermal conductivity. (3) The flax fiber in the present invention has the characteristics of being cool, absorbing moisture and dissipating heat, and being naturally antibacterial. It has strong core absorption and can improve the moisture conductivity of the fabric. The bamboo fiber has the characteristics of being cool, absorbing moisture, breathable, soft, and antibacterial. It has a good moisture absorption effect. At the same time, the bamboo fiber can supplement the softness and enhance the cool feeling. Both flax fiber and bamboo fiber are natural cool feeling materials that can quickly absorb moisture and diffuse sweat. The two fibers can work together to quickly reduce the skin contact temperature. Spandex fiber has excellent elasticity. As the core yarn of the core yarn, it can provide elastic support. The outer yarn is obtained by blending modified nylon and bamboo fiber. The nylon fiber can provide excellent mechanical strength, good wear resistance, high thermal conductivity, and has the excellent characteristics of being soft to the touch, good skin-friendly performance, and cool to the touch. It has excellent heat conduction and sweat absorption and quick drying effects. The bamboo fiber enhances the cool feeling, moisture absorption and soft touch of the outer yarn. The modified nylon fiber ensures the strength, wear resistance and cool feeling modification effect of the outer yarn. The bamboo fiber enhances moisture absorption and contact coolness, further strengthening the superimposed cool effect. Under the elastic support of spandex, evaporation and heat absorption are accelerated. Nano zinc oxide and nano boron nitride work synergistically to quickly conduct body heat. The core-spun yarn structure allows the cooling fibers to directly contact the skin, making the fabric not only instantly cool but also continuously dissipate body surface heat to maximize the cooling experience. (4) In the present invention, a large number of hydrophilic groups are introduced through a series of optimization processes such as modification, blending, and weaving, thereby improving the hygroscopicity of the fabric and preparing a cool fabric. The fibers act synergistically to make the fabric light, breathable, and elastic. The fabric has an obvious instant and continuous cool feeling when touched, absorbs moisture quickly, and can effectively reduce body surface temperature and improve wearing comfort. It has broad application prospects in the fields of clothing, home textiles, etc. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Example 1 A modified nylon fiber, the preparation method of which comprises the following steps: A1. Ultrasonic dispersion of 10 g of nano zinc oxide in 180 g of toluene was performed. After uniform dispersion, 1.2 g of γ-methacryloxypropyltrimethoxysilane was added. The mixture was heated and stirred at 85° C. for 8 h. After the reaction, the mixture was centrifuged, washed with anhydrous ethanol, and vacuum dried at 60° C. for 24 h to obtain olefinated zinc oxide. A2. Ultrasonic dispersion of 10 g of olefinated nano-zinc oxide in 150 g of xylene was performed. After uniform dispersion, 2.4 g of maleic anhydride and 0.05 g of initiator dibenzoyl peroxide were added, stirred and mixed, heated, reacted at 60° C. for 6 h, filtered, washed with acetone, and vacuum dried at 60° C. for 24 h to obtain modified zinc oxide. A3. Mix 0.1 g of modified zinc oxide, 10 g of nylon 6 chips, and 0.01 g of antioxidant 1010, add the mixture to a twin-screw extruder, and melt blend at a temperature of 250° C. Extrude the mixture, and the melt enters a spinning machine after passing through a metering pump, is ejected through a spinneret, and is cooled to obtain modified nylon fiber.

[0033] Example 2 A modified nylon fiber, the preparation method of which comprises the following steps: A1. Ultrasonic dispersion of 10 g of nano-zinc oxide in 195 g of toluene was performed. After uniform dispersion, 1.8 g of γ-methacryloxypropyltrimethoxysilane was added. The mixture was heated and stirred at 90° C. for 7 h. After the reaction, the mixture was centrifuged, washed with anhydrous ethanol, and vacuum dried at 60° C. for 24 h to obtain olefinated zinc oxide. A2. Ultrasonic dispersion of 10 g of olefinated nano-zinc oxide in 155 g of xylene was performed. After uniform dispersion, 3.2 g of maleic anhydride and 0.08 g of initiator dibenzoyl peroxide were added, stirred and mixed, heated, reacted at 65° C. for 5 h, filtered, washed with acetone, and vacuum dried at 60° C. for 24 h to obtain modified zinc oxide. A3. 0.5 g of modified zinc oxide, 10 g of nylon 6 chips, and 0.02 g of antioxidant 1010 were mixed and added to a twin-screw extruder for melt blending at a temperature of 255° C. The melt was extruded through a metering pump into a spinning machine, ejected through a spinneret, and cooled to obtain modified nylon fiber.

[0034] Example 3 A modified nylon fiber, the preparation method of which comprises the following steps: A1. Ultrasonic dispersion of 10 g of nano-zinc oxide in 210 g of toluene was performed. After uniform dispersion, 2 g of γ-methacryloxypropyltrimethoxysilane was added. The mixture was heated and stirred at 95° C. for 6 h. After the reaction, the mixture was centrifuged, washed with anhydrous ethanol, and vacuum dried at 60° C. for 24 h to obtain olefinated zinc oxide. A2. Ultrasonic dispersion of 10 g of olefinated nano-zinc oxide in 160 g of xylene was performed. After uniform dispersion, 3.5 g of maleic anhydride and 0.1 g of initiator dibenzoyl peroxide were added, stirred and mixed, heated, reacted at 70° C. for 4 h, filtered, washed with acetone, and vacuum dried at 60° C. for 24 h to obtain modified zinc oxide. A3. 0.6 g of modified zinc oxide, 10 g of nylon 6 chips, and 0.03 g of antioxidant 1010 were mixed and added to a twin-screw extruder for melt blending at a temperature of 260° C. The melt was extruded through a metering pump into a spinning machine, ejected through a spinneret, and cooled to obtain modified nylon fiber.

[0035] Example 4 A modified spandex fiber, the preparation method of which comprises the following steps: B1. Ultrasonic dispersion of 10 g of hydroxylated nano-boron nitride in 250 g of toluene was performed, and after uniform mixing, 12 g of γ-glycidyloxypropyltrimethoxysilane was added. The mixture was heated and reacted at 80° C. for 12 h. The mixture was filtered, washed with anhydrous ethanol, and vacuum dried at 60° C. for 12 h to obtain epoxide boron nitride. B2. Immerse 10 g of spandex fiber in a sodium hydroxide solution, heat it at 90 ° C for 2 h, wash it with deionized water until it is neutral, then wash it with acetone, immerse it in a mixture of 1 g of γ-aminopropyltriethoxysilane and 120 g of anhydrous ethanol, immerse it at room temperature for 24 h, wash it with deionized water, and dry it at 60 ° C for 12 h to obtain amino-stranded spandex fiber; B3. Ultrasonic disperse 0.3 g of epoxide boron nitride into 50 g of N-methylpyrrolidone, mix well, add 10 g of amino-modified spandex fiber and 0.01 g of triethylamine, heat and stir, react at 50 ° C in a nitrogen atmosphere for 12 h. After the reaction is completed, take out, wash with anhydrous ethanol, deionized water and acetone, and dry at 60 ° C for 12 h to obtain modified spandex fiber.

[0036] Example 5 A modified spandex fiber, the preparation method of which comprises the following steps: B1. Ultrasonic dispersion of 10 g of hydroxylated nano-boron nitride in 280 g of toluene was performed, and after uniform mixing, 16 g of γ-glycidyloxypropyltrimethoxysilane was added. The mixture was heated and reacted at 85° C. for 11 h. The mixture was filtered, washed with anhydrous ethanol, and vacuum dried at 60° C. for 12 h to obtain epoxide boron nitride. B2. Immerse 10 g of spandex fiber in a sodium hydroxide solution, heat it at 90 ° C for 2 h, wash it with deionized water until it is neutral, then wash it with acetone, immerse it in a mixture of 1.2 g of γ-aminopropyltriethoxysilane and 160 g of anhydrous ethanol, immerse it at room temperature for 24 h, wash it with deionized water, and dry it at 60 ° C for 12 h to obtain amino-stranded spandex fiber; B3. Ultrasonic disperse 0.6 g of epoxide boron nitride into 70 g of N-methylpyrrolidone, mix well, add 10 g of amino-modified spandex fiber and 0.015 g of triethylamine, heat and stir, react at 55 ° C in a nitrogen atmosphere for 16 hours. After the reaction is completed, take out, wash with anhydrous ethanol, deionized water and acetone, and dry at 60 ° C for 12 hours to obtain modified spandex fiber.

[0037] Example 6 A modified spandex fiber, the preparation method of which comprises the following steps: B1. Ultrasonic dispersion of 10 g of hydroxylated nano-boron nitride in 300 g of toluene was performed, and after uniform mixing, 20 g of γ-glycidyloxypropyltrimethoxysilane was added. The mixture was heated and reacted at 90° C. for 10 h. The mixture was filtered, washed with anhydrous ethanol, and vacuum dried at 60° C. for 12 h to obtain epoxide boron nitride. B2. Immerse 10 g of spandex fiber in a sodium hydroxide solution, heat it at 90 ° C for 2 h, wash it with deionized water until it is neutral, then wash it with acetone, immerse it in a mixture of 1.4 g of γ-aminopropyltriethoxysilane and 200 g of anhydrous ethanol, immerse it at room temperature for 24 h, wash it with deionized water, and dry it at 60 ° C for 12 h to obtain amino-stranded spandex fiber; B3. Ultrasonic disperse 0.8 g of epoxide boron nitride into 90 g of N-methylpyrrolidone. After mixing evenly, add 10 g of amino-modified spandex fiber and 0.02 g of triethylamine. Heat and stir. React at 60 ° C in a nitrogen atmosphere for 12 h. After the reaction is completed, take out, wash with anhydrous ethanol, deionized water and acetone, and dry at 60 ° C for 12 h to obtain modified spandex fiber.

[0038] Example 7 A nylon-spandex blended cool fabric, the preparation method of which comprises the following steps: Flax fiber and bamboo fiber with a mass ratio of 3:2 are blended as warp yarn, modified spandex fiber is used as core yarn, and modified nylon fiber and bamboo fiber with a mass ratio of 4:1 are blended as outer yarn. The core yarn and outer yarn are blended to obtain core-spun yarn, and the core yarn accounts for 16wt% of the core-spun yarn. The core-spun yarn is used as weft yarn. The warp yarn and weft yarn are woven through warp and weft. The British count of the warp yarn is 40Ne, the British count of the weft yarn is 60Ne, the warp yarn density is 152 strands / inch, and the weft yarn density is 114 strands / inch. A nylon-spandex blended cool fabric is obtained, and the gram weight of the cool fabric is 125g / m 2 .

[0039] The modified nylon fiber used in this embodiment is prepared by the same method as the modified nylon fiber in Example 1, and the modified spandex fiber is prepared by the same method as the modified spandex fiber in Example 4.

[0040] Example 8 A nylon-spandex blended cooling fabric, the preparation method of which comprises the following steps: blending flax fiber and bamboo fiber in a mass ratio of 3:2 as warp yarn, using modified spandex fiber as core yarn, blending modified nylon fiber and bamboo fiber in a mass ratio of 4:1 as outer covering yarn, blending the core yarn and the outer covering yarn to obtain core-spun yarn, wherein the core yarn accounts for 17wt% of the core-spun yarn, and the core-spun yarn is used as weft yarn, and the warp yarn and the weft yarn are woven through warp and weft, wherein the warp yarn has an English count of 48Ne, the weft yarn has an English count of 68Ne, the warp yarn density is 170 strands / inch, and the weft yarn density is 132 strands / inch, thereby obtaining the nylon-spandex blended cooling fabric, and the gram weight of the cooling fabric is 140g / m 2 .

[0041] The modified nylon fiber used in this embodiment is prepared by the same method as the modified nylon fiber in Example 2, and the modified spandex fiber is prepared by the same method as the modified spandex fiber in Example 5.

[0042] Example 9 A nylon-spandex blended cooling fabric, the preparation method of which comprises the following steps: blending flax fiber and bamboo fiber in a mass ratio of 3:2 as warp yarn, using modified spandex fiber as core yarn, blending modified nylon fiber and bamboo fiber in a mass ratio of 4:1 as outer covering yarn, blending the core yarn and the outer covering yarn to obtain core-spun yarn, wherein the core yarn accounts for 18wt% of the core-spun yarn, and the core-spun yarn is used as weft yarn, and the warp yarn and the weft yarn are woven through warp and weft, wherein the warp yarn has an English count of 50Ne, the weft yarn has an English count of 70Ne, the warp yarn density is 178 strands / inch, and the weft yarn density is 140 strands / inch, thereby obtaining the nylon-spandex blended cooling fabric, and the gram weight of the cooling fabric is 145g / m 2 .

[0043] The modified nylon fiber used in this embodiment is prepared by the same method as the modified nylon fiber in Example 3, and the modified spandex fiber is prepared by the same method as the modified spandex fiber in Example 6.

[0044] Comparative Example 1 A nylon-spandex blended fabric, the preparation method of which comprises the following steps: blending flax fiber and bamboo fiber in a mass ratio of 3:2 as warp yarn, using modified spandex fiber as core yarn, blending modified nylon fiber and bamboo fiber in a mass ratio of 4:1 as outer covering yarn, blending the core yarn and the outer covering yarn to obtain core-spun yarn, wherein the core yarn accounts for 17wt% of the core-spun yarn, and the core-spun yarn is used as weft yarn. The warp yarn and the weft yarn are woven through warp and weft, wherein the warp yarn has an English count of 48Ne, the weft yarn has an English count of 68Ne, the warp yarn density is 170 strands / inch, and the weft yarn density is 132 strands / inch, thereby obtaining a nylon-spandex blended fabric, wherein the gram weight of the fabric is 140g / m 2 .

[0045] The preparation method of the modified nylon fiber in this comparative example comprises the following steps: 0.5 g of nano zinc oxide, 10 g of nylon 6 chips, and 0.02 g of antioxidant 1010 are mixed, added to a twin-screw extruder, melt blended at a melt blending temperature of 255° C., extruded, and the melt enters a spinning machine after passing through a metering pump, is ejected through a spinneret, and cooled to obtain modified nylon fiber.

[0046] The preparation method of the modified spandex fiber in this comparative example is the same as that of the modified spandex fiber in Example 5.

[0047] Comparative Example 2 A nylon-spandex blended fabric, the preparation method of which comprises the following steps: blending flax fiber and bamboo fiber in a mass ratio of 3:2 as warp yarn, using modified spandex fiber as core yarn, blending modified nylon fiber and bamboo fiber in a mass ratio of 4:1 as outer covering yarn, blending the core yarn and the outer covering yarn to obtain core-spun yarn, wherein the core yarn accounts for 17wt% of the core-spun yarn, and the core-spun yarn is used as weft yarn. The warp yarn and the weft yarn are woven through warp and weft, wherein the warp yarn has an English count of 48Ne, the weft yarn has an English count of 68Ne, the warp yarn density is 170 strands / inch, and the weft yarn density is 132 strands / inch, thereby obtaining a nylon-spandex blended fabric, wherein the gram weight of the fabric is 140g / m 2 .

[0048] The modified nylon fiber used in this comparative example was prepared by the same method as that of the modified nylon fiber in Example 2.

[0049] The preparation method of the modified spandex fiber in this comparative example includes the following steps: ultrasonically dispersing 0.6 g of nano-boron nitride in 70 g of N-methylpyrrolidone, mixing evenly, adding 10 g of spandex fiber, stirring at 55°C for 16 hours, taking out after the reaction, washing with anhydrous ethanol, deionized water, and acetone, and drying at 60°C for 12 hours to obtain the modified spandex fiber.

[0050] Comparative Example 3 A nylon-spandex blended fabric, the preparation method of which comprises the following steps: blending flax fiber and bamboo fiber in a mass ratio of 3:2 as warp yarn, using modified spandex fiber as core yarn, blending modified nylon fiber and bamboo fiber in a mass ratio of 4:1 as outer covering yarn, blending the core yarn and the outer covering yarn to obtain core-spun yarn, wherein the core yarn accounts for 17wt% of the core-spun yarn, and the core-spun yarn is used as weft yarn. The warp yarn and the weft yarn are woven through warp and weft, wherein the warp yarn has an English count of 48Ne, the weft yarn has an English count of 68Ne, the warp yarn density is 170 strands / inch, and the weft yarn density is 132 strands / inch, thereby obtaining a nylon-spandex blended fabric, wherein the gram weight of the fabric is 140g / m 2 .

[0051] The preparation method of the modified nylon fiber in this comparative example is the same as the preparation method of the modified nylon fiber in comparative example 1.

[0052] The preparation method of the modified spandex fiber in this comparative example is the same as the preparation method of the modified spandex fiber in comparative example 2.

[0053] Comparative Example 4 A nylon-spandex blended fabric, the preparation method of which comprises the following steps: using spandex fiber as warp yarn and nylon fiber as weft yarn, weaving the warp yarn and weft yarn through warp and weft, wherein the warp yarn has an English count of 48Ne, the weft yarn has an English count of 68Ne, the warp yarn density is 170 yarns / inch, and the weft yarn density is 132 yarns / inch, to obtain a nylon-spandex blended fabric, the fabric weight of which is 140g / m 2 .

[0054] The preparation method of nylon fiber in this comparative example includes the following steps: 10g of nylon 6 chips and 0.02g of antioxidant 1010 are mixed, added to a twin-screw extruder, melt blended, the melt blending temperature is 255°C, extruded, the melt enters the spinning machine after passing through a metering pump, sprayed out through a spinneret, cooled, and obtained nylon fiber.

[0055] The preparation method of hydroxylated nano-boron nitride in the examples and comparative examples of the present invention is as follows: 1 g of nano-boron nitride is ultrasonically dispersed in 100 mL of 2 mol / L sodium hydroxide solution, mixed, transferred to a three-necked flask, heated in a water bath, stirred and reacted at 60° C. for 12 h, filtered, washed with deionized water, and dried at 60° C. for 12 h to obtain hydroxylated nano-boron nitride.

[0056] Nano zinc oxide used in the examples and comparative examples of the present invention was purchased from Nanjing Baoket New Materials Co., Ltd., model PZT-30, with an average particle size of 30 nm; nano boron nitride was purchased from Beijing Dekedaojin Technology Co., Ltd., with a particle size of 50 nm; nylon chips were purchased from Changle Liheng Nylon Technology Co., Ltd., and were spinning grade; other undisclosed reagents were all commercially available.

[0057] The fabrics prepared in Examples 6-9 and Comparative Examples 1-4 were subjected to relevant performance tests, and the test results are shown below: (1) Test of instantaneous coolness and duration of coolness: The test standard for instantaneous coolness is based on GB / T 35263-2017 “Test and evaluation of instantaneous coolness of textiles”. A hot plate coolness tester is used to conduct a heat flow transfer test on the fabric to test the contact temperature and coldness of the fabric, i.e., the instantaneous coolness Q-max (W / cm 2 ), qualified threshold: Q-max ≥ 0.15W / cm 2 Before testing, the fabrics were equilibrated in a standard temperature and humidity environment (20±2℃, 65±4%) for 24 hours. According to the 5A procedure of GB / T 8629-2001 "Household Washing and Drying Procedure for Textile Testing", the drying procedure was oven-dried. After washing the fabrics 100 times, the instantaneous coolness test was conducted using the same method. Each group of the above tests was tested three times, and the average value was taken. The instantaneous coolness test results before and after washing are shown in Table 1:

[0058] According to the test results in Table 1, it can be seen that the fabrics in Examples 7-9 have excellent instant cool feeling when touched, and the corresponding Q-max value before washing can reach 0.183~0.197W / cm 2 , Q-max values ​​are all higher than 0.15W / cm 2 After 100 washes, the fabrics in Examples 7-9 still have a good instantaneous cool feeling upon contact, and the corresponding Q-max values ​​can reach 0.156~0.175W / cm 2 , still higher than 0.15W / cm 2 . It shows that the fabric prepared in the embodiment has excellent wash resistance, and after multiple washings, it still has a good instant cool feeling upon contact, indicating that the cool feeling is excellent in durability. In Comparative Example 1, the nano zinc oxide was not modified, and in Comparative Example 2, the nano boron nitride was not modified. The dispersibility of the nano particles was affected, and the dispersion was uneven, resulting in a low instant cool value of the fabric. In Comparative Example 4, modified spandex fiber was used as the warp yarn and modified nylon fiber was used as the weft yarn. The initial instant cool value of the fabric was poor, indicating that the excellent instant cool value of the fabric in the embodiment is the synergistic effect between the fibers.

[0059] (2) Moisture absorption and air permeability test 1) Air permeability test: The test standard refers to GB / T 5453-1997 "Determination of air permeability of textile fabrics", with a pressure difference of 100Pa, a temperature of 20°C, and a humidity of 65%; 2) Moisture absorption performance test: The test standard refers to GB / T 21655.1-2008 "Evaluation of moisture absorption and quick-drying properties of textiles Part 1: Single item combination test method"; each group of the above test was tested three times and the average value was taken. The test results are shown in Table 2:

[0060] According to the test results in Table 2, it can be seen that the fabrics in Examples 7-9 have excellent moisture absorption and air permeability, which meets the performance requirements of cool fabrics. The warp and weft density of the fabrics in Examples 7-9 is moderate. As the gram weight increases, the air permeability decreases, but it is all greater than 800 mm / s, and the air permeability is good. In Comparative Examples 1-3, the nanoparticles were not modified, the dispersibility was poor, and they easily agglomerated and blocked the pores, resulting in poor air permeability. In Comparative Example 4, no natural fiber was added, and there was no core-spun yarn structure, so the air permeability was greatly reduced. In Examples 7-9, the natural fiber has excellent moisture absorption properties, contains a large number of hydrophilic groups, and has a high water absorption rate. In Comparative Examples 1-3, the unmodified nanoparticles destroyed the hydrophilicity of the fiber, resulting in a decrease in water absorption rate, affecting the hygroscopicity of the fabric.

[0061] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that all equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A process for preparing a cool fabric based on a nylon-spandex blend, characterized by: The method comprises the following steps: weaving a blended yarn and a core-spun yarn to obtain a nylon-spandex blended cool fabric; the blended yarn is obtained by blending flax fiber and bamboo fiber; the core-spun yarn uses modified spandex fiber as the core yarn and a blend of modified nylon fiber and bamboo fiber as the outer covering yarn; The modified spandex fiber is obtained by reacting amino spandex fiber with epoxidized boron nitride; the modified nylon fiber is obtained by blending and spinning modified zinc oxide, nylon 6 chips and an antioxidant.

2. The process for preparing a cool fabric based on nylon-spandex blend according to claim 1, characterized in that: The blended yarn is used as the warp yarn, and the mass ratio of flax fiber to bamboo fiber in the warp yarn is 3:2; the core-spun yarn is used as the weft yarn, and the mass ratio of modified nylon fiber to bamboo fiber in the weft yarn is 4:1, the core yarn accounts for 16wt% to 18wt% of the core-spun yarn, the imperial count of the warp yarn is 40-50Ne, and the imperial count of the weft yarn is 60-70Ne; the warp yarn density is 152-178 strands / inch, and the weft yarn density is 114-140 strands / inch.

3. The process for preparing a cool fabric based on nylon-spandex blend according to claim 1, characterized in that: The weight of the cool fabric is 125-145g / m 2 .

4. The process for preparing a cool fabric based on nylon-spandex blend according to claim 1, characterized in that: The preparation method of the modified spandex fiber comprises the following steps: B1. Ultrasonic dispersion of hydroxylated nano-boron nitride in toluene, mixing well, adding γ-glycidyloxypropyltrimethoxysilane, heating, reacting at 80-90°C for 10-12h, filtering, washing, and drying to obtain epoxide boron nitride; B2. Immersing the spandex fiber in a sodium hydroxide solution, heating it at 90° C. for 2 h, washing it with deionized water until it becomes neutral, then washing it with acetone, and immersing it in a mixture of γ-aminopropyltriethoxysilane and anhydrous ethanol at room temperature for 24 h, washing it, and drying it to obtain an amino-modified spandex fiber; B3. Ultrasonic dispersion of epoxidized boron nitride in N-methylpyrrolidone, uniform mixing, adding amino-modified spandex fiber and triethylamine, heating, stirring, and reacting in a nitrogen atmosphere. After the reaction is completed, the fiber is taken out, washed, and dried to obtain modified spandex fiber.

5. The process for preparing a cool fabric based on nylon-spandex blend according to claim 4, characterized in that: The mass ratio of spandex fiber, γ-aminopropyltriethoxysilane and anhydrous ethanol in B2 is 100: (10-14): (1200-2000).

6. The process for preparing a cool fabric based on nylon-spandex blend according to claim 4, characterized in that: The mass ratio of epoxidized boron nitride, N-methylpyrrolidone, amino-stranded spandex fiber, and triethylamine in B3 is (3-8): (500-900): 100: (0.1-0.2), the reaction temperature is 50-60° C., and the reaction time is 12-18 hours.

7. The process for preparing a cool fabric based on nylon-spandex blend according to claim 1, characterized in that: The preparation method of the modified nylon fiber comprises the following steps: A1. Ultrasonic dispersion of nano zinc oxide in toluene. After uniform dispersion, γ-methacryloxypropyltrimethoxysilane is added. The mixture is heated, stirred, and reacted. After the reaction is complete, the mixture is centrifuged, washed, and dried to obtain olefinated zinc oxide. A2. Ultrasonic dispersion of olefinated nano zinc oxide in xylene. After uniform dispersion, maleic anhydride and initiator are added, stirred and mixed, heated, reacted at 60-70°C for 4-6 hours, filtered, washed, and dried to obtain modified zinc oxide. A3. Modified zinc oxide, nylon 6 chips and antioxidant are mixed and added into a twin-screw extruder for melt blending and extrusion. The melt enters a spinning machine through a metering pump, is ejected through a spinneret, and is cooled to obtain modified nylon fiber.

8. The process for preparing a cool fabric based on nylon-spandex blend according to claim 7, characterized in that: The mass ratio of olefinated nano zinc oxide, xylene, maleic anhydride and initiator in A2 is 100: (1500-1600): (24-35): (0.5-1).

9. The process for preparing a cool fabric based on nylon-spandex blend according to claim 7, characterized in that: The mass ratio of the modified zinc oxide, nylon 6 chips and antioxidant in A3 is (1-6):100:(0.1-0.3), and the temperature of melt blending is 250-260°C.

10. A cool fabric based on nylon and spandex blend, characterized by: The cool fabric is made by the preparation method of the nylon-spandex blended fabric according to any one of claims 1 to 9.

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