Ultraviolet-proof fabric and production process thereof

Abstract

The application discloses an anti-ultraviolet fabric and a production process thereof and belongs to the technical field of anti-ultraviolet fabrics. PA6 and hexafluoroisopropanol are added into a reaction kettle and stirred and mixed, EDC, 4-dimethylaminopyridine and polysiloxane modified nanocomposites are added, and the reaction is carried out under the protection of nitrogen and stirring and heat preservation, the reaction product is precipitated, filtered, washed and dried to obtain functionally modified PA6. The functionally modified PA6, PA6 and PET are mixed, and an anti-ultraviolet yarn is prepared through the process of melting, spinning, drawing and winding. Then, the anti-ultraviolet yarn is woven into an anti-ultraviolet fabric through a weft knitting process by using an air-jet loom. The anti-ultraviolet fabric has good anti-ultraviolet performance. Compared with the mode of post-treatment and finishing of artificial fiber fabric, the PA6 is functionally modified by using polysiloxane modified nanocomposites with anti-ultraviolet ability, and the anti-ultraviolet fabric is woven by blending, so that the washing resistance of the anti-ultraviolet fabric is improved, and the anti-ultraviolet performance of the fabric after washing is ensured.

Description

Technical Field

[0001] This invention belongs to the field of UV-protective fabric technology, specifically relating to a UV-protective fabric and its production process. Background Technology

[0002] UV-protective fabric is a type of fabric produced by selecting superior materials and using special processing techniques. UV-protective fabric generally has high light-blocking properties, which can effectively block most ultraviolet rays and reduce the damage of direct sunlight to the skin.

[0003] It is generally believed that the density and thickness of a fabric affect its UV protection capability; the denser and thicker the fabric, the better its UV protection. With the increasing popularity of sun-protective clothing and the demand for lightweight options, UV-protective finishing is necessary on fabrics with lower weight. Commonly used UV protectants include organic UV absorbers such as benzophenone and benzotriazole compounds, as well as inorganic UV shielding agents such as zinc oxide and titanium dioxide. Currently, UV-protective finishing methods for fabrics mainly include padding, sol-gel methods, and chemical grafting, which uniformly disperse UV protectants on the fabric surface.

[0004] Because synthetic fibers are lighter, they are more widely used in sun protection clothing compared to cotton knitted fabrics. However, this also results in a weaker bond between UV protectants and synthetic fiber fabrics, leading to poor washability of the finished UV-protective fabrics, and a significant decrease in UV protection performance after multiple washes. Summary of the Invention

[0005] The purpose of this invention is to provide a UV-protective fabric and its manufacturing process. By preparing a polysiloxane-modified nanocomposite with UV protection capability to functionally modify PA6, the problem of poor washability of UV-protective fabrics can be solved.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A manufacturing process for a UV-protective fabric includes the following steps:

[0008] Functionally modified PA6, PA6 and PET are mixed in a mass ratio of 2-3:6-7:1, and UV-protective yarn is prepared by melting, spinning, drawing and winding. The UV-protective yarn is then woven into fabric using an air-jet loom through weft knitting, thus obtaining UV-protective fabric and completing the production process of UV-protective fabric.

[0009] Furthermore, the functionally modified PA6 is prepared through the following steps:

[0010] Step 1: Add carbon dot composite nano-titanium dioxide, deionized water, tetrahydrofuran, and anhydrous potassium carbonate to the reaction vessel. Stir for 15-20 min at 20-25℃ and 500-800 r / min. Under nitrogen protection, add 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane dropwise to the reaction vessel. After the addition is complete, stir the reaction at 40℃ for 100-110 h. Allow the mixture to stand and separate the layers. Separate the emulsion layer and vacuum dry it. Dissolve the dried solid in dichloromethane, extract it with deionized water, and collect the organic phase. Dry the organic phase with anhydrous magnesium sulfate, filter it, and vacuum dry the filter cake to obtain the polysiloxane modified nanocomposite.

[0011] The reaction process is as follows:

[0012]

[0013] Furthermore, the ratio of carbon dot composite nano-titanium dioxide, deionized water, tetrahydrofuran, anhydrous potassium carbonate, 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane is 3.45:4.8:16:0.04:7.17:6.59.

[0014] Step 2: Add PA6 and hexafluoroisopropanol to the reaction vessel and stir for 60-80 min at 55±5℃ and 200-300 r / min to completely dissolve PA6. Then add EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride), 4-dimethylaminopyridine and polysiloxane modified nanocomposite as activators to the reaction vessel. Keep the reaction vessel under nitrogen protection and stir for 20-24 h. Precipitate the reaction product with anhydrous ethanol, filter, wash the filter cake with anhydrous ethanol 2-3 times, and vacuum dry to obtain functional modified PA6.

[0015] Furthermore, the ratio of PA6, hexafluoroisopropanol, EDC, 4-dimethylaminopyridine, polysiloxane-modified nanocomposite and dimethyl sulfoxide is 2g:30-40mL:0.038g:0.024g:0.08g.

[0016] Furthermore, the carbon dot composite nano-titanium dioxide was prepared through the following steps:

[0017] Step 1: Add citric acid, ethylenediamine, boric acid, and deionized water to a reaction vessel at a mass ratio of 1:1.1:4.1:180-200 and stir to mix. Keep the mixture at 170-180℃ for 8-10 hours, allow it to cool naturally, and filter it through a 0.22μm aqueous microporous membrane. Centrifuge the filtrate at 10000r / min for 10 minutes to separate the precipitate and dry it to obtain nano carbon dots.

[0018] Step 2: Prepare a carbon dot dispersion with anhydrous ethanol to a concentration of 1 mg / mL. Add nano-titanium dioxide, deionized water and anhydrous ethanol to a reaction vessel and stir at 300-500 r / min for 3-5 min. Then add the carbon dot dispersion to the reaction vessel and sonicate for 5-10 min. Stir and react at 140-145℃ for 4-5 h. After natural cooling, vacuum dry the reaction product and grind it to obtain carbon dot composite nano-titanium dioxide.

[0019] Furthermore, the ratio of titanium dioxide, deionized water, anhydrous ethanol, and carbon dot dispersion is 0.4-0.45 g: 20 mL: 6 mL: 8-9 mL.

[0020] The beneficial effects of this invention are:

[0021] The UV-resistant fabric of this invention has good UV protection performance. Compared with the post-processing of synthetic fiber fabrics, PA6 is functionally modified by polysiloxane-modified nanocomposite with UV protection capability, and the fabric is blended to produce a UV-resistant fabric. This improves the washability of the UV-resistant fabric and ensures the UV protection performance of the fabric after washing.

[0022] The polysiloxane-modified nanocomposite of the present invention uses nano-titanium dioxide as a matrix and loads nano-carbon dots on its surface. The nano-carbon dots are prepared hydrothermally from citric acid, ethylenediamine and boric acid as raw materials. They have a large number of oxygen-containing functional groups and have good absorption performance for ultraviolet rays. Combined with nano-titanium dioxide, the absorption range of light is improved and the UV protection performance is significantly improved. 3-Aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane hydrolyze to form silanol groups. During polymerization, some of the silanol groups can also react with the hydroxyl groups on the carbon dot composite nano-titanium dioxide, thereby coating the surface of the carbon dot composite nano-titanium dioxide with polysiloxane containing aminopropyl and trifluoropropyl groups. A polysiloxane-modified nanocomposite is prepared and uniformly mixed with PA6 by solvent dispersion. The polysiloxane-modified nanocomposite has good dispersibility in the solvent. The amino groups it contains can react with the terminal hydroxyl groups in PA6 to increase its dispersibility and stability in PA6, which helps to improve the breaking strength of the yarn. The trifluoropropyl groups help to improve the waterproof and oil-repellent properties of the fabric and further improve the wash resistance of the UV-resistant fabric. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: This example provides a UV-protective fabric, which is produced through the following manufacturing process:

[0025] S1: Citric acid, ethylenediamine, boric acid, and deionized water were added to a reaction vessel at a mass ratio of 1:1.1:4.1:180 and stirred. The mixture was kept at 170℃ for 8 hours, allowed to cool naturally, and filtered through a 0.22μm aqueous microporous membrane. The filtrate was centrifuged at 10000r / min for 10 minutes to separate the precipitate and dry it, thus preparing nano-carbon dots with good ultraviolet absorption capacity.

[0026] S2: Prepare a carbon dot dispersion with a concentration of 1 mg / mL using anhydrous ethanol. Add 4 kg of nano-titanium dioxide, 200 L of deionized water and 60 L of anhydrous ethanol to a reaction vessel and stir at 300 r / min for 3 min. Then add 80 L of carbon dot dispersion to the reaction vessel and sonicate for 5 min. Stir and react at 140 °C for 4 h to load the nano-carbon dots onto the surface of nano-titanium dioxide. Allow to cool naturally, vacuum dry the reaction product, grind and pulverize it to obtain carbon dot composite nano-titanium dioxide.

[0027] S3: Add 3.45 kg of carbon dot composite nano-titanium dioxide, 4.8 kg of deionized water, 16 kg of tetrahydrofuran, and 0.04 kg of anhydrous potassium carbonate to the reactor. Stir for 15 min at 20℃ and 500 r / min. Under nitrogen protection, add 7.17 kg of [unspecified substance] dropwise to the reactor. 3-Aminopropyltrimethoxysilane and 6.59 kg of (3,3,3-trifluoropropyl)trimethoxysilane were added dropwise and then stirred at 40 °C for 100 h. The 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane hydrolyzed to form silanol groups. During polymerization, some of these silanol groups reacted with the hydroxyl groups on the carbon dot composite nano-titanium dioxide, resulting in a polysiloxane containing aminopropyl and trifluoropropyl groups coating the surface of the carbon dot composite nano-titanium dioxide. After standing and separating the layers, the emulsion layer was separated and vacuum dried. The dried solid was dissolved in dichloromethane, extracted with deionized water, and the organic phase was collected. The organic phase was dried with anhydrous magnesium sulfate, filtered, and the filter cake was vacuum dried to obtain the polysiloxane-modified nanocomposite.

[0028] S4: Add 20 kg of PA6 and 300 L of hexafluoroisopropanol to a reaction vessel and stir for 60 min at 50 °C and 200 r / min to completely dissolve PA6. Then add 0.38 kg of EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride) as an activator, 0.24 kg of 4-dimethylaminopyridine, and 0.8 kg of polysiloxane-modified nanocomposite to the reaction vessel. Keep the mixture warm and stirred under nitrogen protection for 20 h. The polysiloxane-modified nanocomposite has good dispersibility in the solvent, and the amino groups in the polysiloxane on its surface can react and graft with the terminal hydroxyl groups in PA6, increasing its dispersibility and stability in PA6. The reaction product is precipitated with anhydrous ethanol, filtered, and the filter cake is washed twice with anhydrous ethanol and vacuum dried to obtain functionally modified PA6.

[0029] S5: Functionally modified PA6, PA6 and PET are mixed in a mass ratio of 2:6:1, and UV-protective yarn is prepared by melting, spinning, drawing and winding. The UV-protective yarn is then woven into UV-protective fabric using an air-jet loom and weft knitting process.

[0030] Example 2: This example provides a UV-protective fabric, which is produced through the following manufacturing process:

[0031] S1: Citric acid, ethylenediamine, boric acid, and deionized water were added to a reaction vessel in a mass ratio of 1:1.1:4.1:190 and stirred. The mixture was kept at 175℃ for 9 hours, allowed to cool naturally, and filtered through a 0.22μm aqueous microporous membrane. The filtrate was centrifuged at 10000r / min for 10 minutes to separate the precipitate and dry it, thus preparing nano-carbon dots with good ultraviolet absorption capacity.

[0032] S2: Prepare a carbon dot dispersion with a concentration of 1 mg / mL using anhydrous ethanol. Add 4.25 kg of nano-titanium dioxide, 200 L of deionized water and 60 L of anhydrous ethanol to a reaction vessel and stir at 400 r / min for 4 min. Then add 85 L of carbon dot dispersion to the reaction vessel and sonicate for 8 min. Stir and react at 142 °C for 4.5 h to load the nano-carbon dots onto the surface of nano-titanium dioxide. Allow to cool naturally, vacuum dry the reaction product, grind and pulverize it to obtain carbon dot composite nano-titanium dioxide.

[0033] S3: Add 3.45 kg of carbon dot composite nano-titanium dioxide, 4.8 kg of deionized water, 16 kg of tetrahydrofuran, and 0.04 kg of anhydrous potassium carbonate to the reactor. Stir for 18 min at 22℃ and 650 r / min. Under nitrogen protection, add 7.17 kg of [unspecified substance] dropwise to the reactor. 3-Aminopropyltrimethoxysilane and 6.59 kg of (3,3,3-trifluoropropyl)trimethoxysilane were added dropwise and then stirred at 40 °C for 105 h. The 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane hydrolyzed to form silanol groups. During polymerization, some of these silanol groups reacted with the hydroxyl groups on the carbon dot composite nano-titanium dioxide, resulting in a polysiloxane containing aminopropyl and trifluoropropyl groups coating the surface of the carbon dot composite nano-titanium dioxide. After standing and separating the layers, the emulsion layer was separated and vacuum dried. The dried solid was dissolved in dichloromethane, extracted with deionized water, and the organic phase was collected. The organic phase was dried with anhydrous magnesium sulfate, filtered, and the filter cake was vacuum dried to obtain the polysiloxane-modified nanocomposite.

[0034] S4: 20 kg of PA6 and 350 L of hexafluoroisopropanol were added to a reaction vessel and stirred at 55 °C and 250 r / min for 70 min to completely dissolve PA6. Then, 0.38 kg of EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride), 0.24 kg of 4-dimethylaminopyridine, and 0.8 kg of polysiloxane-modified nanocomposite were added to the reaction vessel as activators. The reaction was carried out under nitrogen protection with stirring for 22 h. The polysiloxane-modified nanocomposite exhibited good dispersibility in the solvent, and the amino groups in the polysiloxane on its surface could react and graft with the terminal hydroxyl groups in PA6, increasing its dispersibility and stability in PA6. The reaction product was precipitated with anhydrous ethanol, filtered, and the filter cake was washed twice with anhydrous ethanol and vacuum dried to obtain functionally modified PA6.

[0035] S5: Functionally modified PA6, PA6 and PET are mixed in a mass ratio of 2.5:6.5:1, and UV-protective yarn is prepared by melting, spinning, drawing and winding. The UV-protective yarn is then woven into UV-protective fabric using an air-jet loom and weft knitting process.

[0036] Example 3: This example provides a UV-protective fabric, which is produced through the following manufacturing process:

[0037] S1: Citric acid, ethylenediamine, boric acid, and deionized water were added to a reaction vessel at a mass ratio of 1:1.1:4.1:200 and stirred. The mixture was kept at 180℃ for 10 h, allowed to cool naturally, and filtered through a 0.22 μm aqueous microporous membrane. The filtrate was centrifuged at 10000 r / min for 10 min to separate the precipitate and dry it, thus preparing nano-carbon dots with good ultraviolet absorption capacity.

[0038] S2: Prepare a carbon dot dispersion with a concentration of 1 mg / mL using anhydrous ethanol. Add 4.5 kg of nano-titanium dioxide, 200 L of deionized water and 60 L of anhydrous ethanol to a reaction vessel and stir at 500 r / min for 5 min. Then add 90 L of carbon dot dispersion to the reaction vessel and sonicate for 10 min. Stir and react at 145 °C for 5 h to load the nano-carbon dots onto the surface of nano-titanium dioxide. Allow to cool naturally, vacuum dry the reaction product, grind and pulverize it to obtain carbon dot composite nano-titanium dioxide.

[0039] S3: Add 3.45 kg of carbon dot composite nano-titanium dioxide, 4.8 kg of deionized water, 16 kg of tetrahydrofuran, and 0.04 kg of anhydrous potassium carbonate to the reactor. Stir for 20 min at 25℃ and 800 r / min. Under nitrogen protection, add 7.17 kg of [unspecified substance] dropwise to the reactor. 3-Aminopropyltrimethoxysilane and 6.59 kg of (3,3,3-trifluoropropyl)trimethoxysilane were added dropwise and then stirred at 40 °C for 110 h. The 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane hydrolyzed to form silanol groups. During polymerization, some of these silanol groups reacted with the hydroxyl groups on the carbon dot composite nano-titanium dioxide, resulting in a polysiloxane containing aminopropyl and trifluoropropyl groups coating the surface of the carbon dot composite nano-titanium dioxide. After standing and separating the layers, the emulsion layer was separated and vacuum dried. The dried solid was dissolved in dichloromethane, extracted with deionized water, and the organic phase was collected. The organic phase was dried with anhydrous magnesium sulfate, filtered, and the filter cake was vacuum dried to obtain the polysiloxane-modified nanocomposite.

[0040] S4: 20 kg of PA6 and 400 L of hexafluoroisopropanol were added to a reaction vessel and stirred at 60 °C and 300 r / min for 80 min to completely dissolve PA6. Then, 0.38 kg of EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride), 0.24 kg of 4-dimethylaminopyridine, and 0.8 kg of polysiloxane-modified nanocomposite were added to the reaction vessel as activators. The reaction was carried out under nitrogen protection with stirring for 24 h. The polysiloxane-modified nanocomposite exhibited good dispersibility in the solvent, and the amino groups in the polysiloxane on its surface could react and graft with the terminal hydroxyl groups in PA6, increasing its dispersibility and stability in PA6. The reaction product was precipitated with anhydrous ethanol, filtered, and the filter cake was washed three times with anhydrous ethanol and vacuum dried to obtain functionally modified PA6.

[0041] S5: Functionally modified PA6, PA6 and PET are mixed in a mass ratio of 3:7:1, and UV-protective yarn is prepared by melting, spinning, drawing and winding. The UV-protective yarn is then woven into UV-protective fabric using an air-jet loom and weft knitting process.

[0042] Comparative Example 1: Based on Example 3, step S3 was changed by replacing carbon dot composite nano titanium dioxide with nano titanium dioxide, while the other steps remained unchanged, and a UV-protective fabric was prepared.

[0043] Comparative Example 2: Based on Example 3, in step S3, (3,3,3-trifluoropropyl)trimethoxysilane was replaced with the same molar mass of 3-aminopropyltrimethoxysilane, while the other steps remained unchanged, to prepare a UV-protective fabric.

[0044] Comparative Example 3: Based on Example 3, in step S3, 3-aminopropyltrimethoxysilane was replaced with the same molar mass of (3,3,3-trifluoropropyl)trimethoxysilane, while the other steps remained unchanged, to prepare a UV-protective fabric.

[0045] Comparative Example 4: Based on Example 3, the carbon dot composite nano-titanium dioxide from step S2 was prepared into a slurry of 50 g / L using deionized water. PA6 and PET were mixed at a mass ratio of 10:1. The fabric was prepared using the method in step S5. The fabric was then impregnated and processed in the slurry to prepare a UV-protective fabric with a carbon dot composite nano-titanium dioxide loading of 0.05 wt%.

[0046] In the examples and comparative examples, a single-screw extruder with a screw diameter of 150 mm and an aspect ratio of 30 was used to prepare the UV-protective yarn. The raw material melt temperature was 300°C. After being metered by a metering pump, the melt was extruded into a filament bundle through the spinneret of a spinning equipment at a spinning speed of 600 mm / min. After spraying with spinning oil, the yarn was drawn at a draw ratio of 5.5, heat-set at 245°C, and then wound into shape. The resulting UV-protective yarn contained 96 monofilaments per strand. A ZAX9100 air-jet loom was used for weaving, with the following process parameters: machine speed 600 r / min, sheathing time 300°, and on-machine tension 3200 N. The weight of the woven UV-protective fabric was approximately 85 g / m². 2 .

[0047] In the examples and comparative examples, nano-titanium dioxide was purchased from Nanjing Tianxing New Materials Co., Ltd., with a diameter of 5-10 nm; PA6 was J2400F spinning-grade nylon chip resin from Hangzhou Juhua Shun; and PET was 608S spinning-grade polyester pure resin from Shanghai Yuanfang.

[0048] Performance tests were conducted on Examples 1-3 and Comparative Examples 1-4. The breaking strength of different UV-resistant yarns was measured using an electronic tensile testing machine. The UV protection performance of different UV-resistant fabrics was evaluated according to GB / T 18830-2009, and the UPF value, UVA transmittance, and UVB transmittance of different UV-resistant fabrics were recorded. Washing was performed according to procedure 5A of GB / T 8629-2001 "Testing Procedures for Textiles - Household Washing and Drying". Drying was done by tumbling at 55°C. After cooling for 5 minutes, the UV protection performance of the UV-resistant fabrics was measured after 50 washes. The results are shown in Table 1.

[0049] Table 1

[0050]

[0051] As shown in Table 1, the UV-protective fabrics in Examples 1-3 have high UPF values ​​and low UVA and UVB transmittance. Compared to Comparative Example 4, which directly impregnates and loads UV-protective materials, the UV-protective fabrics in these examples still exhibit good UV protection performance after 50 washes. Comparative Example 1 demonstrates that loading nano-carbon dots with nano-titanium dioxide significantly improves the UV protection performance of the fabric. The decrease in UV protection performance after washing in Comparative Example 2 is due to the lack of trifluoropropyl groups in the polysiloxane, which reduces the wash resistance of the UV-protective fabric. The decrease in yarn breaking strength in Comparative Example 3 is due to the lack of aminopropyl groups in the polysiloxane, which reduces the chemical grafting of the UV-protective nanofiller with PA6, thus lowering dispersibility and compatibility.

[0052] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for a UV-protective fabric, characterized in that, Includes the following steps: Functionally modified PA6, PA6 and PET are mixed in a mass ratio of 2-3:6-7:1, and UV-protective yarn is prepared by melting, spinning, drawing and winding. The UV-protective yarn is then woven into UV-protective fabric using an air-jet loom. The functionally modified PA6 is prepared through the following steps: Nano carbon dots were prepared into a carbon dot dispersion with a concentration of 1 mg / mL using anhydrous ethanol. Nano titanium dioxide, deionized water and anhydrous ethanol were added to a reaction vessel and stirred at 300-500 r / min for 3-5 min. Then, the carbon dot dispersion was added to the reaction vessel and ultrasonically dispersed for 5-10 min. The mixture was stirred at 140-145℃ for 4-5 h and allowed to cool naturally. The reaction product was then vacuum dried, ground and pulverized to obtain carbon dot composite nano titanium dioxide. Carbon dot composite nano-titanium dioxide, deionized water, tetrahydrofuran, and anhydrous potassium carbonate were added to a reaction vessel. The mixture was stirred at 20-25℃ and 500-800 r / min for 15-20 min. Under nitrogen protection, 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane were added dropwise to the reaction vessel. After the addition was complete, the mixture was stirred at 40℃ for 100-110 h. The mixture was allowed to stand and separate into layers. The emulsion layer was separated and dried under vacuum. The dried solid was dissolved in dichloromethane and deionized water was added. The organic phase was extracted and collected. The organic phase was dried with anhydrous magnesium sulfate, filtered, and the filter cake was dried under vacuum to obtain the polysiloxane-modified nanocomposite. PA6 and hexafluoroisopropanol were added to a reaction vessel and stirred at 55±5℃ and 200-300r / min for 60-80min. EDC, 4-dimethylaminopyridine and polysiloxane-modified nanocomposite were added to the reaction vessel and the mixture was stirred and kept warm under nitrogen protection for 20-24h. The reaction product was precipitated with anhydrous ethanol, filtered, and the filter cake was washed 2-3 times with anhydrous ethanol and dried under vacuum to obtain functionally modified PA6.

2. The manufacturing process of the UV-protective fabric according to claim 1, characterized in that, The ratio of PA6, hexafluoroisopropanol, EDC, 4-dimethylaminopyridine and polysiloxane modified nanocomposite is 2g:30-40mL:0.038g:0.024g:0.08g.

3. The manufacturing process of a UV-protective fabric according to claim 1, characterized in that, The ratio of the amount of carbon dot composite nano-titanium dioxide, deionized water, tetrahydrofuran, anhydrous potassium carbonate, 3-aminopropyltrimethoxysilane and (3,3,3-trifluoropropyl)trimethoxysilane is 3.45:4.8:16:0.04:7.17:6.

59.

4. The manufacturing process of a UV-protective fabric according to claim 1, characterized in that, The ratio of titanium dioxide, deionized water, anhydrous ethanol and carbon dot dispersion is 0.4-0.45g: 20mL: 6mL: 8-9mL.

5. The manufacturing process of a UV-protective fabric according to claim 1, characterized in that, The nano carbon dots are prepared by the following steps: Citric acid, ethylenediamine, boric acid, and deionized water were added to a reaction vessel at a mass ratio of 1:1.1:4.1:180-200 and stirred. The mixture was kept at 170-180℃ for 8-10 hours, then allowed to cool naturally. The mixture was filtered through a 0.22μm aqueous microporous membrane, and the filtrate was centrifuged at 10000r / min for 10 minutes to separate the precipitate and dry it to obtain nano carbon dots.

6. A UV-protective fabric, characterized in that, It is produced by the production process described in any one of claims 1-5.

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