An anti-ultraviolet fiber material and its preparation method

Abstract

This invention belongs to the technical field of polyester fiber materials, specifically relating to an anti-UV fiber material and its preparation method. Organic UV absorbers only have strong UV absorption capabilities in the near-UV region, resulting in unstable and unsatisfactory UV resistance. To address these issues, this invention provides an anti-UV fiber material with a surface-loaded UV absorber. The UV absorber is generated by a thermal condensation reaction between the hydroxyl groups of a benzotriazole UV absorber and the carboxyl groups of carboxyl-modified nano-TiO2 and polyether-modified ethyl benzoate. The polyester fiber obtained by this invention exhibits a wide wavelength range for UV absorption, covering the UV-A, UV-B, and UV-C bands, and demonstrates good UV resistance stability. Furthermore, the benzotriazole UV absorber, carboxyl-modified nano-TiO2, and polyether-modified ethyl benzoate form a cross-linked network on the polyester fiber surface, resulting in long-lasting UV resistance.

Description

Technical Field

[0001] This invention belongs to the field of UV-resistant polyester fiber technology, specifically relating to a UV-resistant fiber material and its preparation method. Background Technology

[0002] Of the ultraviolet (UV) radiation (200-400nm), approximately 10% of UV-B (280-320nm) and about 90% of UV-A (320-400nm) are absorbed by the ozone layer in the atmosphere, while only about 10% of UV-B (280-320nm) and about 90% of UV-A (320-400nm) can penetrate the atmosphere and reach the Earth's surface. Polyester is widely used to make fibers and films due to its good mechanical properties, weather resistance, transparency, and low density. However, its products (such as polyester fibers) age rapidly under the influence of ultraviolet radiation and atmospheric oxygen, leading to significant deterioration in appearance, mechanical properties, and electrical properties. Therefore, developing an anti-UV polyester fiber has good market prospects.

[0003] Studies have shown that adding organic UV absorbers, such as benzotriazole UV absorbers, to polyester fiber materials can significantly improve the UV aging resistance of polyester fibers. For example, invention patent CN104562302 A discloses a UV-resistant polyester fiber that uses 2-(2-hydroxyphenyl)-4,6-diamino-2H-benzotriazole as a UV absorber added to the polyester fiber. The condensation reaction between 2-benzotriazole and polycarboxylated polysiloxanes forms a crosslinking product on the surface of the polyester fiber, giving the polyester fiber good UV aging resistance. However, organic UV absorbers only have strong UV absorption capacity in the near-UV region (UV-C, 200-280 nm). Therefore, the UV resistance of polyester fibers still needs further improvement.

[0004] Inorganic UV absorbers can not only absorb ultraviolet (UV) light but also reduce UV radiation through reflection or scattering. Furthermore, they have a wide absorption range, covering all UV-A, UV-B, and UV-C bands. However, because their particle size is at the micro-nano level, direct addition to polyester fiber materials can easily lead to agglomeration, hindering their ability to effectively resist UV aging.

[0005] To overcome the shortcomings of organic or inorganic UV absorbers, this invention combines organic and inorganic UV absorber materials through chemical bonding to obtain a polymeric organic-inorganic hybrid UV absorber. This absorber is generated by the thermal condensation reaction between the hydroxyl groups of benzotriazole UV absorbers and the carboxyl groups of carboxyl-modified nano-TiO2 and polyether-modified ethyl benzoate, and then adheres to the surface of polyester fibers. This significantly improves the UV aging resistance and UV stability of polyester fibers. Summary of the Invention

[0006] The problem with existing technologies is that organic UV absorbers only have strong UV absorption capabilities in the near-UV region, resulting in unstable UV protection performance and unsatisfactory effects. To address these issues, this invention provides an anti-UV fiber material comprising PET polyester fibers and a UV absorber. The UV absorber is loaded onto the surface of the PET polyester fibers and is generated by a thermal condensation reaction between the hydroxyl groups of a benzotriazole UV absorber and the carboxyl groups of carboxyl-modified nano-TiO2 and polyether-modified ethyl benzoate.

[0007] Specifically, the benzotriazole ultraviolet absorber contains at least two hydroxyl reactive groups, including but not limited to 2-(2,4-dihydroxyphenyl)-2H-benzotriazole.

[0008] Specifically, the preparation method of the carboxyl-modified nano-TiO2 includes the following steps:

[0009] (1) Silane coupling agent modified nano-TiO2

[0010] Nano-TiO2 was dispersed in deionized water to obtain a dispersion with a concentration of 1-5 g / L. Then, an aminosilane coupling agent was added, wherein the mass ratio of the aminosilane coupling agent to the nano-TiO2 was 1-3:100. The pH of the solution was adjusted to 2-4, and the mixture was stirred at 60-80℃ for 1-2 h. After the reaction was completed, the mixture was centrifuged and redispersed in deionized water. The mixture was then ultrasonically dispersed and centrifuged again to remove excess coupling agent. The above steps of centrifugation and ultrasonic dispersion in deionized water were repeated at least twice. After drying, silane coupling agent modified nano-TiO2 was obtained.

[0011] (2) Polyether-modified nano-TiO2

[0012] Four-arm polyethylene glycol carboxyl groups (molecular weight 2000, purity 95%, purchased from Shanghai Pengshuo Biotechnology Co., Ltd.) were dissolved in deionized water to obtain a dispersion with a concentration of 1-3 g / L. Then, carboxyl activator N-hydroxysuccinimide (NHS) and 1-ethyl-(3-dimethylaminopropyl) (EDC) were added. The mass ratio of the four-arm polyethylene glycol carboxyl groups to NHS and EDC was 2:1.5-2:1.5-2. The reaction was stirred at room temperature for 0.5-2 h to obtain the acylation reaction solution.

[0013] 40 mg of silane coupling agent modified nano-TiO2 was uniformly dispersed in deionized water to obtain a dispersion with a concentration of 1-5 g / L. 0.5-1 L of acylation reaction solution was added, and the pH was adjusted to 4.5-6. The reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then completed. The mixture was filtered, washed, and dried to obtain polyether modified nano-TiO2.

[0014] Specifically, the aminosilane coupling agent includes, but is not limited to, at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropyltriethoxysilane, N-β(aminoethyl)-γ-aminopropyldiethoxysilane, and aminoethylaminoethylaminopropyltrimethoxysilane.

[0015] Specifically, the nano-TiO2 is rutile TiO2.

[0016] Specifically, the average particle size of the nano-TiO2 is 10-20 nm.

[0017] Specifically, the preparation method of the polyether-modified ethyl benzoate includes the following steps:

[0018] 10g of four-arm polyethylene glycol carboxyl 4Arm-PEG-COOH (molecular weight 2000, purchased from Shanghai Pengshuo Biotechnology Co., Ltd.) was dissolved in 1L of anhydrous dichloromethane. 10-15g of HATU (2-(7-azobenzotriazole)-tetramethylurea hexafluorophosphate) and 10-15mL of DIPEA (N,N-diisopropylethylamine) were added and stirred until dissolved. Then, ethyl aminobenzoate was added, with a molar ratio of ethyl aminobenzoate to four-arm polyethylene glycol carboxyl groups of 1:1. After stirring and dissolving, the reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then considered complete. The reaction product was centrifuged, washed with ethanol, and dried to obtain polyether-modified ethyl benzoate.

[0019] Specifically, the preparation steps of an anti-ultraviolet fiber material include melt spinning of PET polyester chips, cooling, impregnation with ultraviolet absorber emulsion, bundling and oiling, hot stretching and heat setting.

[0020] Specifically, the melt spinning temperature is 200-220℃.

[0021] Specifically, the temperature for hot stretching is 150-200℃, and the temperature for heat setting is 150-200℃.

[0022] Specifically, the ultraviolet absorber emulsion comprises the following components by weight:

[0023] 1-5 parts of benzotriazole UV absorber

[0024] Carboxyl-modified nano-TiO2 10-15 parts

[0025] 3-5 parts of polyether-modified ethyl benzoate

[0026] 5-10 parts of surfactant

[0027] 60-80 parts deionized water.

[0028] Specifically, the surfactant is a nonionic surfactant.

[0029] Specifically, the nonionic surfactant is an alkylphenol polyoxyethylene ether compound.

[0030] Specifically, the immersion time should be no less than 30 minutes, and the immersion temperature should be 50-60℃.

[0031] The present invention has the following beneficial effects:

[0032] (1) This invention combines organic and inorganic UV absorber materials through chemical bonding to obtain a polymeric organic-inorganic hybrid UV absorber. It is generated by the thermal condensation reaction between the hydroxyl groups of benzotriazole UV absorbers and the carboxyl groups of carboxyl-modified nano-TiO2 and polyether-modified ethyl benzoate and is attached to the surface of polyester fibers. This solves the problem of easy agglomeration of inorganic UV absorbers and significantly improves the UV aging resistance and UV stability of polyester fibers.

[0033] (2) The polyester fiber obtained by the present invention has a wide wavelength range for ultraviolet absorption, involving three bands: UV-A, UV-B and UV-C.

[0034] (3) The polyester fiber obtained by the present invention has good UV resistance. Benzotriazole UV absorber, carboxyl-modified nano TiO2, and polyether-modified ethyl benzoate form a cross-linked network on the surface of the polyester fiber, which makes the UV resistance more durable.

[0035] (4) The UV absorber on the surface of the polyester fiber obtained by the present invention has a macromolecular structure that is not easy to migrate. Its structure also contains the same structural segment ethyl benzoate structure as PET polyester fiber. The macromolecular UV absorber obtained by the present invention has better compatibility with polyester fiber and is more conducive to the performance of UV absorber's UV resistance. Detailed Implementation

[0036] The present invention will be described in detail below with reference to embodiments. However, it should be understood that the following embodiments are merely illustrative examples of implementation of the present invention and are not intended to limit the scope of the present invention.

[0037] The four-arm polyethylene glycol carboxyl group in the following embodiments of the present invention has a molecular weight of 2000 and a purity of 95%, and was purchased from Shanghai Pengshuo Biotechnology Co., Ltd.

[0038] The 2-(2,4-dihydroxyphenyl)-2H-benzotriazole in the following embodiments of the present invention has the CAS number 22607-31-4.

[0039] The nano TiO2 in the following embodiments of the present invention is rutile TiO2 with an average particle size of 10 nm. Brand: Hongwu Nano, Model: HW-T681.

[0040] The surfactant used in the following embodiments of the present invention is nonylphenol polyoxyethylene ether.

[0041] The polyester chips used in the following embodiments of the present invention are spinning-grade polyester chips, purchased from Rongsheng Chemical Fiber Group Co., Ltd., with a specification of 100D.

[0042] Example 1

[0043] An anti-ultraviolet fiber material is obtained from PET polyester chips through melt spinning, cooling, impregnation with an ultraviolet absorber emulsion, bundling and oiling, hot stretching, and heat setting. The melt spinning temperature is 200°C, the metering pump pressure is 50 MPa, the hot stretching temperature is 160°C, the stretch ratio is 3 times, and the heat setting temperature is 180°C. Before bundling and oiling, the polyester fibers are impregnated in the ultraviolet absorber emulsion for 30 minutes at a temperature of 60°C. The ultraviolet absorber emulsion comprises the following components by weight:

[0044]

[0045] The preparation method of the carboxyl-modified nano-TiO2 is as follows:

[0046] (1) Silane coupling agent modified nano-TiO2

[0047] Nano-TiO2 was dispersed in deionized water to obtain a dispersion with a concentration of 1 g / L. Then, an aminosilane coupling agent was added, wherein the mass ratio of the aminosilane coupling agent to the nano-TiO2 was 1:100. The pH of the solution was adjusted to 4, and the mixture was stirred at 60°C for 1 h. After the reaction was completed, the mixture was centrifuged and redispersed in deionized water. The dispersion was then ultrasonically dispersed and centrifuged again to remove excess coupling agent. The centrifugation and ultrasonic dispersion in deionized water steps were repeated twice. After drying, silane coupling agent modified nano-TiO2 was obtained. The aminosilane coupling agent was γ-aminopropyltriethoxysilane.

[0048] (2) Polyether-modified nano-TiO2

[0049] The four-arm polyethylene glycol carboxyl group was dissolved in deionized water to obtain a dispersion with a concentration of 1 g / L. Then, carboxyl activators NHS and EDC were added. The mass ratio of the four-arm polyethylene glycol carboxyl group to NHS and EDC was 2:1.5:1.5. The reaction was stirred at room temperature for 0.5 h to obtain the acylation reaction solution.

[0050] 40 mg of silane coupling agent modified nano-TiO2 was uniformly dispersed in deionized water to obtain a dispersion with a concentration of 1 g / L. 0.5 L of acylation reaction solution was added, and the pH was adjusted to 4.5. The reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then completed. The mixture was filtered, washed, and dried to obtain polyether modified nano-TiO2.

[0051] Specifically, the preparation method of the polyether-modified ethyl benzoate is as follows:

[0052] 10g of four-arm polyethylene glycol carboxyl group 4Arm-PEG-COOH was dissolved in 1L of anhydrous dichloromethane. 10g of HATU and 10mL of DIPEA were added, and the mixture was stirred until homogeneous. Then, ethyl aminobenzoate was added, with a molar ratio of ethyl aminobenzoate to four-arm polyethylene glycol carboxyl group of 1:1. After stirring and dissolving, the reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then considered complete. The reaction product was centrifuged, washed with ethanol, and dried to obtain polyether-modified ethyl benzoate.

[0053] The UV-resistant fiber obtained in Example 1, after being tested by a 2000-hour accelerated aging test with a 5KW xenon lamp, retained 92% of its breaking strength.

[0054] Example 2

[0055] An anti-ultraviolet fiber material is obtained from PET polyester chips through melt spinning, cooling, impregnation with an ultraviolet absorber emulsion, bundling and oiling, hot stretching, and heat setting. The melt spinning temperature is 210°C, the metering pump pressure is 80 MPa, the hot stretching temperature is 180°C, the stretch ratio is 4 times, and the heat setting temperature is 180°C. Before bundling and oiling, the polyester fibers are impregnated in the ultraviolet absorber emulsion for 50 minutes at a temperature of 50°C. The ultraviolet absorber emulsion comprises the following components by weight:

[0056]

[0057] The preparation method of the carboxyl-modified nano-TiO2 is as follows:

[0058] (1) Silane coupling agent modified nano-TiO2

[0059] Nano-TiO2 was dispersed in deionized water to obtain a dispersion with a concentration of 3 g / L. Then, an aminosilane coupling agent was added, wherein the mass ratio of the aminosilane coupling agent to the nano-TiO2 was 2:100. The pH of the solution was adjusted to 3, and the mixture was stirred at 70°C for 1 h. After the reaction was completed, the mixture was centrifuged and redispersed in deionized water. The dispersion was then ultrasonically dispersed and centrifuged again to remove excess coupling agent. The above steps of centrifugation and ultrasonic dispersion in deionized water were repeated 3 times. After drying, silane coupling agent modified nano-TiO2 was obtained. The aminosilane coupling agent was N-β(aminoethyl)-γ-aminopropyltrimethoxysilane.

[0060] (2) Polyether-modified nano-TiO2

[0061] The four-arm polyethylene glycol carboxyl group was dissolved in deionized water to obtain a dispersion with a concentration of 2 g / L. Then, carboxyl activators NHS and EDC were added. The mass ratio of the four-arm polyethylene glycol carboxyl group to NHS and EDC was 2:2:2. The reaction was stirred at room temperature for 1 h to obtain an acylation reaction solution.

[0062] 40 mg of silane coupling agent modified nano-TiO2 was uniformly dispersed in deionized water to obtain a dispersion with a concentration of 2 g / L. 0.7 L of acylation reaction solution was added, and the pH was adjusted to 4.5. The reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then completed. The mixture was filtered, washed, and dried to obtain polyether modified nano-TiO2.

[0063] Specifically, the preparation method of the polyether-modified ethyl benzoate is as follows:

[0064] 10g of four-arm polyethylene glycol carboxyl group 4Arm-PEG-COOH was dissolved in 1L of anhydrous dichloromethane. 13g of HATU and 12mL of DIPEA were added, and the mixture was stirred until homogeneous. Then, ethyl aminobenzoate was added, with a molar ratio of ethyl aminobenzoate to four-arm polyethylene glycol carboxyl group of 1:1. After stirring and dissolving, the reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then considered complete. The reaction product was centrifuged, washed with ethanol, and dried to obtain polyether-modified ethyl benzoate.

[0065] The UV-resistant fiber obtained in Example 2, after being tested by a 2000-hour accelerated aging test with a 5KW xenon lamp, retained 95% of its breaking strength.

[0066] Example 3

[0067] An anti-ultraviolet fiber material is obtained from PET polyester chips through melt spinning, cooling, impregnation with an ultraviolet absorber emulsion, bundling and oiling, hot stretching, and heat setting. The melt spinning temperature is 220°C, the metering pump pressure is 100 MPa, the hot stretching temperature is 200°C, the stretch ratio is 3.5 times, and the heat setting temperature is 200°C. Before bundling and oiling, the polyester fibers are impregnated in the ultraviolet absorber emulsion for 30 minutes at a temperature of 60°C. The ultraviolet absorber emulsion comprises the following components by weight:

[0068]

[0069] The preparation method of the carboxyl-modified nano-TiO2 is as follows:

[0070] (1) Silane coupling agent modified nano-TiO2

[0071] Nano-TiO2 was dispersed in deionized water to obtain a dispersion with a concentration of 5 g / L. Then, an aminosilane coupling agent was added, with a mass ratio of aminosilane coupling agent to nano-TiO2 of 3:100. The pH of the solution was adjusted to 4, and the mixture was stirred at 80°C for 2 h. After the reaction was completed, the mixture was centrifuged and redispersed in deionized water. The dispersion was then ultrasonically dispersed and centrifuged again to remove excess coupling agent. The centrifugation and ultrasonic dispersion in deionized water steps were repeated three times. After drying, silane coupling agent modified nano-TiO2 was obtained. The aminosilane coupling agent was γ-aminopropyltrimethoxysilane.

[0072] (2) Polyether-modified nano-TiO2

[0073] The four-arm polyethylene glycol carboxyl group was dissolved in deionized water to obtain a dispersion with a concentration of 3 g / L. Then, carboxyl activators NHS and EDC were added. The mass ratio of the four-arm polyethylene glycol carboxyl group to NHS and EDC was 2:2:2. The reaction was stirred at room temperature for 2 hours to obtain an acylation reaction solution.

[0074] 40 mg of silane coupling agent modified nano-TiO2 was uniformly dispersed in deionized water to obtain a dispersion with a concentration of 5 g / L. 1 L of acylation reaction solution was added, and the pH was adjusted to 4.5. The reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then completed. The mixture was filtered, washed, and dried to obtain polyether modified nano-TiO2.

[0075] Specifically, the preparation method of the polyether-modified ethyl benzoate is as follows:

[0076] 10g of four-arm polyethylene glycol carboxyl group 4Arm-PEG-COOH was dissolved in 1L of anhydrous dichloromethane. 15g of HATU and 15mL of DIPEA were added, and the mixture was stirred until homogeneous. Then, ethyl aminobenzoate was added, with a molar ratio of ethyl aminobenzoate to four-arm polyethylene glycol carboxyl group of 1:1. After stirring and dissolving, the reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then considered complete. The reaction product was centrifuged, washed with ethanol, and dried to obtain polyether-modified ethyl benzoate.

[0077] The UV-resistant fiber obtained in Example 3, after being tested by a 2000-hour accelerated aging test with a 5KW xenon lamp, retained 95% of its breaking strength.

[0078] Comparative Example 1 is the same as Example 1, except that polyether-modified ethyl benzoate was not added to the UV absorber emulsion of Comparative Example 1. The UV-resistant fiber obtained in Comparative Example 1, after undergoing an accelerated aging test with a 5KW xenon lamp for 2000 hours, maintained 90% of its tensile strength.

[0079] Comparative Example 2 is the same as Example 1, except that the ultraviolet absorber emulsion of Comparative Example 2 is composed of the following components by weight:

[0080]

[0081] The UV-resistant fiber obtained in Comparative Example 2 retained 70% of its breaking strength after undergoing an accelerated aging test with a 5KW xenon lamp for 2000 hours.

[0082] Comparative Example 3 is the same as Example 1, except that the ultraviolet absorber emulsion of Comparative Example 3 is composed of the following components by weight:

[0083]

[0084] The UV-resistant fiber obtained in Comparative Example 3, after undergoing an accelerated aging test with a 5KW xenon lamp for 2000 hours, retained 88% of its breaking strength.

[0085] Comparative Example 4 is the same as Example 1, except that the ultraviolet absorber emulsion of Comparative Example 4 is composed of the following components by weight:

[0086]

[0087] The UV-resistant fiber obtained in Comparative Example 4 retained 75% of its breaking strength after undergoing an accelerated aging test with a 5KW xenon lamp for 2000 hours.

[0088] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A UV-resistant fiber material, characterized in that, It includes PET polyester fiber and ultraviolet absorber, wherein the ultraviolet absorber is loaded on the surface of PET polyester fiber, and the ultraviolet absorber is generated by thermal condensation reaction between the hydroxyl groups of benzotriazole ultraviolet absorber and the carboxyl groups of carboxyl-modified nano-TiO2 and polyether-modified ethyl benzoate. The benzotriazole ultraviolet absorber contains at least two hydroxyl reactive groups; The preparation method of the carboxyl-modified nano-TiO2 includes the following steps: (1) Silane coupling agent modified nano-TiO2 Nano-TiO2 was dispersed in deionized water to obtain a dispersion with a concentration of 1-5 g / L. Then, an aminosilane coupling agent was added, wherein the mass ratio of the aminosilane coupling agent to the nano-TiO2 was 1-3:

100. The pH of the solution was adjusted to 2-4, and the mixture was stirred at 60-80℃ for 1-2 h. After the reaction was completed, the mixture was centrifuged and redispersed in deionized water. The mixture was then ultrasonically dispersed and centrifuged again to remove excess coupling agent. The above steps of centrifugation and ultrasonic dispersion in deionized water were repeated at least twice. After drying, silane coupling agent modified nano-TiO2 was obtained. (2) Polyether-modified nano-TiO2 The four-arm polyethylene glycol carboxyl group was dissolved in deionized water to obtain a dispersion with a concentration of 1-3 g / L. Then, carboxyl activators NHS and EDC were added. The mass ratio of the four-arm polyethylene glycol carboxyl group to NHS and EDC was 2:1.5-2:1.5-2. The reaction was stirred at room temperature for 0.5-2 h to obtain an acylation reaction solution. 40 mg of silane coupling agent modified nano-TiO2 was uniformly dispersed in deionized water to obtain a dispersion with a concentration of 1-5 g / L. 0.5-1 L of acylation reaction solution was added, and the pH was adjusted to 4.5-6. The reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then completed. The mixture was filtered, washed, and dried to obtain polyether modified nano-TiO2. The preparation method of the polyether-modified ethyl benzoate includes the following steps: 10g of four-arm polyethylene glycol carboxyl group 4Arm-PEG-COOH was dissolved in 1L of anhydrous dichloromethane. 10-15g of HATU and 10-15mL of DIPEA were added and stirred until dissolved. Then, ethyl aminobenzoate was added, with a molar ratio of ethyl aminobenzoate to four-arm polyethylene glycol carboxyl group of 1:

1. After stirring and dissolving, the reaction was monitored by FTIR while stirring. The reaction was carried out at room temperature until the amino absorption peak in the reaction system disappeared in the infrared spectrum. The reaction was then completed. The reaction product was centrifuged, washed with ethanol, and dried to obtain polyether-modified ethyl benzoate. The preparation steps of the aforementioned UV-resistant fiber material include melt spinning of PET polyester chips, cooling, impregnation with UV absorber emulsion, bundling and oiling, hot stretching and heat setting; The ultraviolet absorber emulsion comprises the following components by weight: 1-5 parts of benzotriazole UV absorber Carboxyl-modified nano-TiO2 10-15 parts 3-5 parts of polyether-modified ethyl benzoate 5-10 parts of surfactant 60-80 parts deionized water.

2. The UV-resistant fiber material according to claim 1, characterized in that, The benzotriazole ultraviolet absorber is 2-(2,4-dihydroxyphenyl)-2H-benzotriazole.

3. The UV-resistant fiber material according to claim 1, characterized in that, The aminosilane coupling agent includes at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropyltriethoxysilane, N-β(aminoethyl)-γ-aminopropyldiethoxysilane, and aminoethylaminopropyltrimethoxysilane.

4. The UV-resistant fiber material according to claim 1, characterized in that, The nano-TiO2 is rutile anatase nano-TiO2.

5. The UV-resistant fiber material according to claim 1, characterized in that, The temperature of the melt spinning is 200-220℃.

6. The UV-resistant fiber material according to claim 1, characterized in that, The surfactant is a nonionic surfactant.

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