High-sunscreen high-breath cool copper ammonia texture fabric and preparation method thereof

Abstract

The application discloses a strong-sunscreen high-breathability cool copper-ammonia texture fabric and a preparation method thereof, and relates to the technical field of copper-ammonia texture fabrics. The preparation method comprises the following steps: adding viscose fibers into a non-ionic surfactant solution for ultrasonic treatment to obtain pretreated viscose fibers; adding the pretreated viscose fibers into a cationization treatment liquid, standing, and baking to obtain cationized viscose fibers; adding the cationized viscose fibers into an alginate solution, room-temperature dip-coating, and room-temperature air-drying to obtain alginate-coated viscose fibers; adding the alginate-coated viscose fibers into a copper nanoparticle precursor solution, heating and reacting to obtain modified viscose fibers; mixing the modified viscose fibers with polyester staple fibers, and shuttle weaving to obtain a shuttle-woven fabric; adding the shuttle-woven fabric into a cationic post-treatment liquid, double-dip-double-nip to obtain a post-treated fabric; soaking the post-treated fabric in deionized water, preheating, adding a palladium chloride solution, and heat-preserving and reacting to obtain a copper-ammonia texture fabric.

Description

Technical Field

[0001] This invention relates to the field of cupro fabric technology, specifically to a cupro fabric with strong sun protection, high breathability and cooling sensation, and its preparation method. Background Technology

[0002] Cupro fabric, as an important branch of regenerated cellulose fiber fabrics, is widely used in clothing, home textiles, and other fields due to its soft feel similar to natural cupro fibers, good hydrophilicity, and the cost advantages of regenerated fibers. With the increasing demand for functional textile products in the consumer market, cupro fabric, which combines strong sun protection and high breathability, has become a core requirement for outdoor apparel, summer commuter wear, and other scenarios. These scenarios require fabrics that can effectively block ultraviolet rays to prevent skin damage while maintaining excellent breathability and moisture wicking capabilities to prevent stuffiness when worn.

[0003] However, optimizing the functionality of existing cupro fabrics faces multiple technical bottlenecks. Sun protection and breathability are difficult to balance simultaneously. Traditional cupro fabrics rely solely on the weak UV-shielding ability of the fibers themselves, which is far from sufficient to meet strong sun protection needs. While some technologies attempt to enhance sun protection by coating with UV absorbers or loading metal nanoparticles, these often result in excessively thick coatings and particle aggregation that clogs fiber gaps, leading to a significant decrease in breathability and a loss of wearing comfort. Furthermore, the viscose and polyester blend systems commonly used in cupro fabrics are traditionally designed with cost and structural stability in mind, without considering functional requirements. This can lead to either an inappropriate polyester ratio reducing the fabric's breathability and hydrophilicity, or affecting the stability of the functional particle loading substrate, further exacerbating the difficulty of balancing multiple performance aspects.

[0004] Therefore, inventing a cupro fabric with strong sun protection and high breathability is of great significance. Summary of the Invention

[0005] The purpose of this invention is to provide a cupro fabric with strong sun protection, high breathability and cooling sensation and its preparation method, so as to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The preparation method of a cupro fabric with strong sun protection, high breathability and cooling sensation includes the following steps: S1: Ultrasonic pretreatment: Viscose fiber is added to a nonionic surfactant solution for ultrasonic treatment, washed and dried to obtain pretreated viscose fiber. S2: Cationicization: Pretreated viscose fibers are added to a cationization solution, allowed to stand, dried, and baked to obtain cationized viscose fibers. S3: Coating: Add cationized viscose fiber to an alginate solution, dip and coat at room temperature, and air dry at room temperature to obtain alginate-coated viscose fiber; S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, heated to react, washed, and dried to obtain modified viscose fibers. S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. S6: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, and dry to obtain the post-treated fabric. S7: Secondary loading: The post-treated fabric is soaked in deionized water, preheated, palladium chloride solution is added, the reaction is kept at a constant temperature, and then dried to obtain a cupro-textured fabric.

[0007] Further, the specific steps of the ultrasonic pretreatment in step S1 are as follows: add viscose fiber to a nonionic surfactant solution, heat to 35-40℃ and ultrasonically treat for 15-20 minutes, add 10g / L acetic acid solution to adjust the pH of the system to 4.5-5, rinse the viscose fiber with deionized water at 40-45℃ for 3-5 minutes, rinse the viscose fiber with deionized water at 20-25℃ for 9-10 minutes, and air dry at room temperature to obtain pretreated viscose fiber; Furthermore, the concentration of the nonionic surfactant solution is 0.5-1 g / L; Furthermore, the nonionic surfactant is Levantin LNB, purchased from BASF; Furthermore, the ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0008] Furthermore, the specific steps of the S2 cationization are as follows: the pretreated viscose fiber is added to the cationization treatment solution, left to stand at room temperature for 15-20 minutes, dried in an environment of 80-85℃ for 10-15 minutes, and then baked in an environment of 120-130℃ for 2-4 minutes to obtain cationized viscose fiber. Furthermore, in the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8-12 g / L, and the concentration of sodium hydroxide is 4-6 g / L; Furthermore, the ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0009] Furthermore, the specific steps of step S3 coating are as follows: adding cationized viscose fiber into an alginate solution, immersing and coating at room temperature for 12-20 minutes, and drying at room temperature to obtain alginate-coated viscose fiber; Furthermore, the ratio of the cationized viscose fiber to the alginate solution is 1:15; Furthermore, in the alginate solution, the concentration of sodium alginate is 1.8-2.2% w / v, and the concentration of nonionic dispersant is 0.1-0.3 g / L.

[0010] Furthermore, the parameters of the sodium alginate are: viscosity 200 cP, number-average molecular weight 6000, and mannuronic acid / guluronic acid ratio 1.75 ± 0.12. Furthermore, the nonionic dispersant includes any one of fatty alcohol polyoxyethylene ether and Tween 80; Further, the loading steps in step S4 are as follows: alginate-coated viscose fibers are added to copper nanoparticle precursor solution, the pH of the system is adjusted to 7-8 with 0.5-1g / L sodium hydroxide solution, the reaction is heated to 60-70℃ for 40-50min, and the viscose fibers are rinsed with deionized water at 20-25℃ for 12-15min to obtain modified viscose fibers. Furthermore, the ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25; Furthermore, the copper nanoparticle precursor solution contains copper sulfate pentahydrate at a concentration of 300-800 mg / L and ascorbic acid at a concentration of 1.2-1.8% w / v.

[0011] Furthermore, the specific textile steps in step S5 are as follows: the modified viscose fiber is blended with polyester staple fiber and woven to obtain a woven fabric. Furthermore, in the blending process, the ratio of modified viscose fiber to polyester staple fiber is (65-75):(25-35); Furthermore, the woven fabric is plain weave or twill weave, with a weight of 135-150 g / m². 2 .

[0012] Further, the specific steps of the post-treatment in step S6 are as follows: the woven fabric is added to the cationic post-treatment solution, dipped and rubbed twice, and the fabric is squeezed until the wet weight gain is about 99-100%. It is then dried in an environment of 80-85℃ for 10-15 minutes, and then baked in an environment of 120-130℃ for 2-4 minutes. The fabric is washed with deionized water and 1wt% acetic acid solution, and then dried in an environment of 80-85℃ to obtain the post-treated fabric. Furthermore, the ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; Furthermore, the concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 6-8 g / L, and the concentration of sodium hydroxide is 3-4 g / L.

[0013] Furthermore, the specific steps of the secondary loading in step S7 are as follows: soak the post-treated fabric in deionized water, heat it to 95-96℃, adjust the pH to 12-12.5, add palladium chloride solution, keep it warm and stir for 1-1.5h, wash it with deionized water, and dry it in an environment of 75-85℃ to obtain a cupro-ammonia textured fabric. Furthermore, the concentration of the palladium chloride solution is 100-300 mg / L; Furthermore, the bath ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes the reduction reaction of copper sulfate pentahydrate and ascorbic acid to load copper nanoparticles with localized surface plasmon resonance effect onto the surface of viscose fibers. Furthermore, through post-processing, palladium nanoparticles are loaded onto the surface of the textile fabric, forming a synergistic effect of "absorption + reflection" with the copper nanoparticles, which efficiently absorbs ultraviolet light (UVA, UVB) in the 280-400nm wavelength band, further improving the ultraviolet shielding efficiency.

[0015] 2. To improve the durability of the fabric, this invention involves cationizing viscose fibers with 3-chloro-2-hydroxypropyltrimethylammonium chloride, making the fiber surface positively charged. This enhances the electrostatic bonding with negatively charged alginate, forming a uniform thin coating that provides a stable loading substrate for metal nanoparticles. Furthermore, it improves the fiber's resistance to Cu... 2+ Pd 2+ Its coordination ability prevents nanoparticles from detaching and extends UV resistance durability.

[0016] 3. This invention modifies viscose fibers to give them excellent hydrophilicity. Combined with a hydrophilic alginate coating, it can quickly absorb sweat from the skin surface and diffuse and evaporate it, thus reducing the body surface temperature. At the same time, the metal nanoparticles have good thermal conductivity, which can accelerate the conduction and dissipation of heat from the body surface. This works synergistically with the cooling effect of moisture absorption and evaporation to ensure the cooling performance of the fabric. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Preparation method of high sun protection, high breathability and cooling cupro texture fabric: S1: Ultrasonic pretreatment: Add viscose fiber to 0.5g / L Levantin LNB nonionic surfactant solution, heat to 35℃ and ultrasonically treat for 15min, add 10g / L acetic acid solution to adjust the pH of the system to 4.5, rinse viscose fiber with 40℃ deionized water for 3min, then rinse viscose fiber with 25℃ deionized water for 9min, and air dry at room temperature to obtain pretreated viscose fiber; The ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0019] S2: Cationicization: Add the pretreated viscose fiber to the cationization treatment solution, let it stand at room temperature for 15 min, dry it in an environment of 80℃ for 10 min, and then bake it in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8 g / L, and the concentration of sodium hydroxide is 4 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0020] S3: Coating: Add cationized viscose fiber to alginate solution, immerse and coat at room temperature for 12 min, and air dry at room temperature to obtain alginate-coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:15. The alginate solution contains sodium alginate at a concentration of 1.8% w / v and Tween 80 at a concentration of 0.1 g / L.

[0021] S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were rinsed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains copper sulfate pentahydrate at a concentration of 300 mg / L and ascorbic acid at a concentration of 1.2% w / v.

[0022] S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0023] S6: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is about 100%, dry it in an 80°C environment for 10 min, then bake it in an 120°C environment for 2 min, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an 80°C environment to obtain the post-treated fabric. The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 6 g / L, and the concentration of sodium hydroxide is 3 g / L.

[0024] S7: Secondary loading: Soak the post-treated fabric in deionized water, heat to 95°C, adjust the pH to 12.5, add palladium chloride solution, keep warm and stir for 1 hour, wash with deionized water, and dry in an 80°C environment to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 100 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0025] Example 2: Preparation method of high sun protection, high breathability and cooling cupro texture fabric: S1: Ultrasonic pretreatment: Add viscose fiber to 0.5g / L Levantin LNB nonionic surfactant solution, heat to 35℃ and ultrasonically treat for 15min, add 10g / L acetic acid solution to adjust the pH of the system to 4.5, rinse viscose fiber with 40℃ deionized water for 3min, then rinse viscose fiber with 25℃ deionized water for 9min, and air dry at room temperature to obtain pretreated viscose fiber; The ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0026] S2: Cationicization: Add the pretreated viscose fiber to the cationization treatment solution, let it stand at room temperature for 15 min, dry it in an environment of 80℃ for 10 min, and then bake it in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 10 g / L, and the concentration of sodium hydroxide is 5 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0027] S3: Coating: Add cationized viscose fiber to alginate solution, immerse and coat at room temperature for 12 min, and air dry at room temperature to obtain alginate-coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:15. The alginate solution contains sodium alginate at a concentration of 2% w / v and Tween 80 at a concentration of 0.2 g / L.

[0028] S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were rinsed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains 500 mg / L copper sulfate pentahydrate and 1.5% w / v ascorbic acid.

[0029] S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0030] S6: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is about 100%, dry it in an 80°C environment for 10 min, then bake it in an 120°C environment for 2 min, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an 80°C environment to obtain the post-treated fabric. The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 8 g / L, and the concentration of sodium hydroxide is 4 g / L.

[0031] S7: Secondary loading: Soak the post-treated fabric in deionized water, heat to 95°C, adjust the pH to 12.5, add palladium chloride solution, keep warm and stir for 1 hour, wash with deionized water, and dry in an 80°C environment to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 200 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0032] Example 3: Preparation method of high sun protection, high breathability and cooling cupro texture fabric: S1: Ultrasonic pretreatment: Add viscose fiber to 0.5g / L Levantin LNB nonionic surfactant solution, heat to 35℃ and ultrasonically treat for 15min, add 10g / L acetic acid solution to adjust the pH of the system to 4.5, rinse viscose fiber with 40℃ deionized water for 3min, then rinse viscose fiber with 25℃ deionized water for 9min, and air dry at room temperature to obtain pretreated viscose fiber; The ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0033] S2: Cationicization: Add the pretreated viscose fiber to the cationization treatment solution, let it stand at room temperature for 15 min, dry it in an environment of 80℃ for 10 min, and then bake it in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 12 g / L, and the concentration of sodium hydroxide is 6 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0034] S3: Coating: Add cationized viscose fiber to alginate solution, immerse and coat at room temperature for 12 min, and air dry at room temperature to obtain alginate-coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:15. The alginate solution contains sodium alginate at a concentration of 2.2% w / v and Tween 80 at a concentration of 0.3 g / L.

[0035] S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were rinsed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains 800 mg / L copper sulfate pentahydrate and 1.8% w / v ascorbic acid.

[0036] S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0037] S6: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is about 100%, dry it in an 80°C environment for 10 min, then bake it in an 120°C environment for 2 min, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an 80°C environment to obtain the post-treated fabric. The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 8 g / L, and the concentration of sodium hydroxide is 4 g / L.

[0038] S7: Secondary loading: Soak the post-treated fabric in deionized water, heat to 95°C, adjust the pH to 12.5, add palladium chloride solution, keep warm and stir for 1 hour, wash with deionized water, and dry in an 80°C environment to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 300 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0039] Example 4: Preparation method of high sun protection, high breathability and cooling cupro texture fabric: S1: Ultrasonic pretreatment: Add viscose fiber to 0.5g / L Levantin LNB nonionic surfactant solution, heat to 35℃ and ultrasonically treat for 15min, add 10g / L acetic acid solution to adjust the pH of the system to 4.5, rinse viscose fiber with 40℃ deionized water for 3min, then rinse viscose fiber with 25℃ deionized water for 9min, and air dry at room temperature to obtain pretreated viscose fiber; The ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0040] S2: Cationicization: Add the pretreated viscose fiber to the cationization treatment solution, let it stand at room temperature for 15 min, dry it in an environment of 80℃ for 10 min, and then bake it in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 12 g / L, and the concentration of sodium hydroxide is 6 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0041] S3: Coating: Add cationized viscose fiber to alginate solution, immerse and coat at room temperature for 12 min, and air dry at room temperature to obtain alginate-coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:15. The alginate solution contains sodium alginate at a concentration of 2.2% w / v and Tween 80 at a concentration of 0.3 g / L.

[0042] S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were rinsed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains 800 mg / L copper sulfate pentahydrate and 1.8% w / v ascorbic acid.

[0043] S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 70:30. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0044] S6: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is about 100%, dry it in an 80°C environment for 10 min, then bake it in an 120°C environment for 2 min, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an 80°C environment to obtain the post-treated fabric. The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 8 g / L, and the concentration of sodium hydroxide is 4 g / L.

[0045] S7: Secondary loading: Soak the post-treated fabric in deionized water, heat to 95°C, adjust the pH to 12.5, add palladium chloride solution, keep warm and stir for 1 hour, wash with deionized water, and dry in an 80°C environment to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 300 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0046] Comparative Example 1: Preparation method of cupro fabric with strong sun protection, high breathability and cooling sensation: S1: Textile: Modified viscose fiber and polyester staple fiber are blended and woven to obtain cupro fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0047] Comparative Example 2: Preparation method of high sun protection, high breathability and cooling cupro textured fabric: S1: Ultrasonic pretreatment: Viscose fiber was added to 0.5g / L Levantin LNB nonionic surfactant solution, heated to 35℃ and ultrasonically treated for 15min, 10g / L acetic acid solution was added to adjust the pH of the system to 4.5, the viscose fiber was rinsed with 40℃ deionized water for 3min, and then rinsed with 25℃ deionized water for 9min, and air-dried at room temperature to obtain pretreated viscose fiber; The ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0048] S2: Cationicization: Add the pretreated viscose fiber to the cationization treatment solution, let it stand at room temperature for 15 min, dry it in an environment of 80℃ for 10 min, and then bake it in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8 g / L, and the concentration of sodium hydroxide is 4 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0049] S3: Loading: Cationic viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were washed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains copper sulfate pentahydrate at a concentration of 300 mg / L and ascorbic acid at a concentration of 1.2% w / v.

[0050] S4: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0051] S5: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is about 100%, dry it in an 80℃ environment for 10 minutes, then bake it in an 120℃ environment for 2 minutes, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an 80℃ environment to obtain the post-treated fabric. The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 6 g / L, and the concentration of sodium hydroxide is 3 g / L.

[0052] S6: Secondary loading: Soak the post-treated fabric in deionized water, heat to 95°C, adjust the pH to 12.5, add palladium chloride solution, keep warm and stir for 1 hour, wash with deionized water, and dry in an 80°C environment to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 100 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0053] Comparative Example 3: Preparation method of high sun protection, high breathability and cool cupro texture fabric: S1: cationization: add viscose fiber to cationization treatment solution, let stand at room temperature for 15 min, dry in an environment of 80℃ for 10 min, and then bake in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8 g / L, and the concentration of sodium hydroxide is 4 g / L; The ratio of viscose fiber to cationization treatment liquid bath is 1:20.

[0054] S2: Coating: Add cationic viscose fiber to alginate solution, immerse and coat at room temperature for 12 min, and air dry at room temperature to obtain alginate coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:15. The alginate solution contains sodium alginate at a concentration of 1.8% w / v and Tween 80 at a concentration of 0.1 g / L.

[0055] S3: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were rinsed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains copper sulfate pentahydrate at a concentration of 300 mg / L and ascorbic acid at a concentration of 1.2% w / v.

[0056] S4: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The woven fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0057] S5: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is about 100%, dry it in an 80℃ environment for 10 minutes, then bake it in an 120℃ environment for 2 minutes, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an 80℃ environment to obtain the post-treated fabric. The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 6 g / L, and the concentration of sodium hydroxide is 3 g / L.

[0058] S6: Secondary loading: Soak the post-treated fabric in deionized water, heat to 95°C, adjust the pH to 12.5, add palladium chloride solution, keep warm and stir for 1 hour, wash with deionized water, and dry in an 80°C environment to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 100 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:25.

[0059] Comparative Example 4: Preparation method of high sun protection, high breathability and cooling cupro texture fabric: S1: Ultrasonic pretreatment: Viscose fiber is added to 0.5g / L Levantin LNB nonionic surfactant solution, heated to 35℃ and ultrasonically treated for 15min, 10g / L acetic acid solution is added to adjust the pH of the system to 4.5, viscose fiber is rinsed with 40℃ deionized water for 3min, then rinsed with 25℃ deionized water for 9min, and air-dried at room temperature to obtain pretreated viscose fiber; The ratio of the viscose fiber to the nonionic surfactant solution is 1:30.

[0060] S2: Cationicization: Add the pretreated viscose fiber to the cationization treatment solution, let it stand at room temperature for 15 min, dry it in an environment of 80℃ for 10 min, and then bake it in an environment of 120℃ for 2 min to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8 g / L, and the concentration of sodium hydroxide is 4 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:20.

[0061] S3: Coating: Add cationized viscose fiber to alginate solution, immerse and coat at room temperature for 12 min, and air dry at room temperature to obtain alginate-coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:15. The alginate solution contains sodium alginate at a concentration of 1.8% w / v and Tween 80 at a concentration of 0.1 g / L.

[0062] S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, the pH of the system was adjusted to 7 with 0.5 g / L sodium hydroxide solution, the reaction was heated to 60℃ for 40 min, and the viscose fibers were rinsed with 25℃ deionized water for 12 min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:25. The copper nanoparticle precursor solution contains copper sulfate pentahydrate at a concentration of 300 mg / L and ascorbic acid at a concentration of 1.2% w / v.

[0063] S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain cupro fabric. In the blending process, the ratio of modified viscose fiber to polyester staple fiber is 65:35. The cupro fabric is plain or twill weave, with a weight of 135g / m². 2 .

[0064] Performance testing: UV protection performance: According to AATCC 183-2010, the UV protection factor (UPF), average transmittance of UVA (315-400 nm) (T-UVA), and average transmittance of UVB (280-315 nm) (T-UVB) were tested. Breathability: The breathability was tested according to GB / T 5453-2012.

[0065] Moisture wicking performance: Moisture wicking performance was tested according to GB / T 21655.2-2019; Cooling performance: The contact cooling coefficient was tested according to GB / T 35263-2017; The performance test results are shown in Table 1 below.

[0066] Table 1 Performance Test Data of Cupro Fabric

[0067] Conclusion: The cupro-ammonia fabric prepared by this invention has excellent UV protection and breathability.

[0068] Comparative Example 1 uses no metal nanoparticles or coatings, relying solely on the weak shielding of the fiber itself as a benchmark for UV transmittance and air permeability.

[0069] Comparative Example 2: Without the alginate coating, the loading of metal nanoparticles was reduced, the synergistic effect was decreased, and the UV resistance was reduced. Comparative Example 3 fibers lack surface pretreatment, resulting in uneven dispersion of metal particles, localized blind spots in protection, or agglomeration of nanoparticles, leading to reduced UV resistance. Comparative Example 4 only uses copper as a single metal load, lacking palladium for reflective synergy, which leads to reduced UV resistance. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for preparing a cupro fabric with strong sun protection, high breathability, and cooling sensation, characterized in that: Includes the following steps: S1: Ultrasonic pretreatment: The viscose fiber is added to a nonionic surfactant solution for ultrasonic treatment, washed, and dried to obtain pretreated viscose fiber; S2: Cationicization: Pretreated viscose fibers are added to a cationization solution, allowed to stand, dried, and baked to obtain cationized viscose fibers. S3: Coating: Add cationized viscose fiber to an alginate solution, dip and coat at room temperature, and air dry at room temperature to obtain alginate-coated viscose fiber; S4: Loading: Alginate-coated viscose fibers were added to copper nanoparticle precursor solution, heated to react, washed, and dried to obtain modified viscose fibers. S5: Textiles: Modified viscose fiber is blended with polyester staple fiber and woven to obtain woven fabric. S6: Post-treatment: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, and dry to obtain the post-treated fabric. S7: Secondary loading: The post-treated fabric is soaked in deionized water, preheated, palladium chloride solution is added, the reaction is kept at a constant temperature, and then dried to obtain a cupro-textured fabric.

2. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: The specific steps of ultrasonic pretreatment in step S1 are as follows: add viscose fiber to a nonionic surfactant solution, heat to 35-40℃ and ultrasonically treat for 15-20 minutes, add 10g / L acetic acid solution to adjust the pH of the system to 4.5-5, rinse the viscose fiber with deionized water at 40-45℃ for 3-5 minutes, then rinse the viscose fiber with deionized water at 20-25℃ for 9-10 minutes, and air dry at room temperature to obtain pretreated viscose fiber; The concentration of the nonionic surfactant solution is 0.5-1 g / L; The ratio of the viscose fiber to the nonionic surfactant solution is 1:

30.

3. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: The specific steps of step S2 cationization are as follows: add the pretreated viscose fiber into the cationization treatment solution, let it stand at room temperature for 15-20 minutes, dry it in an environment of 80-85℃ for 10-15 minutes, and then bake it in an environment of 120-130℃ for 2-4 minutes to obtain cationized viscose fiber. In the cationization treatment solution, the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8-12 g / L, and the concentration of sodium hydroxide is 4-6 g / L; The ratio of the pretreated viscose fiber to the cationization treatment liquid bath is 1:

20.

4. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: The specific steps of step S3 coating are as follows: add cationic viscose fiber to alginate solution, immerse and coat at room temperature for 12-20 minutes, and air dry at room temperature to obtain alginate coated viscose fiber; The ratio of the cationic viscose fiber to the alginate solution is 1:

15. The alginate solution contains sodium alginate at a concentration of 1.8-2.2% w / v and a nonionic dispersant at a concentration of 0.1-0.3 g / L.

5. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: The specific steps of loading in step S4 are as follows: alginate-coated viscose fibers are added to copper nanoparticle precursor solution, the pH of the system is adjusted to 7-8 with 0.5-1g / L sodium hydroxide solution, the reaction is heated to 60-70℃ for 40-50min, and the viscose fibers are rinsed with deionized water at 20-25℃ for 12-15min to obtain modified viscose fibers. The ratio of the alginate-coated viscose fiber to the copper nanoparticle precursor liquid bath is 1:

25. The copper nanoparticle precursor solution contains copper sulfate pentahydrate at a concentration of 300-800 mg / L and ascorbic acid at a concentration of 1.2-1.8% w / v.

6. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: Step S5, the specific textile steps, are as follows: the modified viscose fiber and polyester staple fiber are blended and woven to obtain woven fabric. During the blending process, the ratio of modified viscose fiber to polyester staple fiber is (65-75):(25-35); The woven fabric is plain or twill, with a weight of 135-150 g / m2.

7. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: The specific steps of post-treatment in step S6 are as follows: Add the woven fabric to the cationic post-treatment solution, dip and rub twice, squeeze the fabric until the wet weight gain is 99-100%, dry it in an environment of 80-85℃ for 10-15 minutes, then bake it in an environment of 120-130℃ for 2-4 minutes, wash the fabric with deionized water and 1wt% acetic acid solution, and dry it in an environment of 80-85℃ to obtain the post-treated fabric; The ratio of the woven fabric to the cationic post-treatment liquid bath is 1:20; The concentration of diallyl dimethyl ammonium chloride in the cation post-treatment solution is 6-8 g / L, and the concentration of sodium hydroxide is 3-4 g / L.

8. The method for preparing the high sun protection, high breathability, and cooling cupro fabric according to claim 1, characterized in that: The specific steps of the secondary loading in step S7 are as follows: Soak the post-treated fabric in deionized water, heat it to 95-96℃, adjust the pH to 12-12.5, add palladium chloride solution, keep it warm and stir for 1-1.5h, wash it with deionized water, and dry it in an environment of 75-85℃ to obtain a cupro-ammonia textured fabric. The concentration of the palladium chloride solution is 100-300 mg / L; The ratio of the post-treated fabric to the palladium chloride solution is 1:

25.

9. A cupro fabric with strong sun protection, high breathability, and a cooling feel, characterized by: The cupro fabric prepared by the method for preparing the high sun protection, high breathability and cooling cupro fabric according to any one of claims 1-8.

Images