Anti-aging polyester fiber and preparation method thereof

Abstract

The invention discloses an anti-aging polyester fiber and a preparation method thereof, belongs to the technical field of fiber preparation, and is used for solving the technical problem that the ultraviolet aging resistance and wear resistance of polyester fibers in the prior art need to be further improved. The preparation method comprises the following steps: preparing hydroxyl-terminated modified polysiloxane containing unsaturated olefin double bonds through a telomerization reaction, preparing the hydroxyl-terminated modified polysiloxane into a modified chain extender, carrying out a chain extension reaction on polyester to obtain modified polyester, and carrying out melt spinning on the modified polyester fiber to obtain the modified polyester fiber. The finishing agent is prepared from the modified nanoparticles and the intermediate I, and the modified polyester fibers are finished to obtain the polyester fibers, so that not only is the ultraviolet aging resistance of the polyester fibers improved, but also the wear resistance and mechanical strength of the polyester fibers are improved.

Description

Technical Field

[0001] This invention relates to the field of fiber preparation technology, specifically to an anti-aging polyester fiber and its preparation method. Background Technology

[0002] Polyester fiber, as the world's largest-produced synthetic fiber, is widely used in clothing, home textiles, industrial textiles and other fields. It has good mechanical properties, thermal stability and chemical resistance, and is low in cost and recyclable. Therefore, it occupies a core position in the textile industry.

[0003] However, with the expansion of application scenarios and the increase in functional requirements, traditional polyester fibers have gradually revealed problems such as insufficient anti-aging performance, easy yellowing, and decreased strength during long-term use. In particular, they are more prone to photoaging and performance degradation in outdoor environments or under strong ultraviolet conditions, which limits their further application in fields of high weather resistance and high stability.

[0004] In the existing technology, the main reason for the aging problem of polyester fiber is that the ester bond in its molecular structure is easily hydrolyzed, oxidized and degraded by ultraviolet light. Under the combined action of long-term light, heat and oxygen and humid environment, polyester chain segments will undergo degradation processes such as breakage, cross-linking and free radical reaction, resulting in a significant decrease in fiber mechanical properties.

[0005] In addition, polyester fibers lack the ability to shield against ultraviolet radiation. After being exposed to light, the fiber surface is prone to micro-cracks and fading, which further accelerates the aging process. In order to improve the UV aging resistance of polyester fibers, ultraviolet absorbers or light stabilizers are usually added or surface coatings are modified during the preparation of polyester fibers. Although these methods can delay aging to a certain extent, they generally have problems such as easy migration of additives and poor coating stability, making it difficult to achieve a balance between performance and processing adaptability. Summary of the Invention

[0006] The purpose of this invention is to provide an anti-aging polyester fiber and its preparation method, which solves the technical problem that the anti-ultraviolet aging performance and abrasion resistance of polyester fibers in the prior art need to be further improved.

[0007] The objective of this invention can be achieved through the following technical solution: a method for preparing anti-aging polyester fiber, comprising the following steps:

[0008] S1. Add modified polysiloxane, polyethylene glycol, toluene and catalyst to a nitrogen-protected reactor and stir. Raise the reactor temperature to 120-130℃ and maintain the temperature for 8-10 hours. Lower the reactor temperature to 75-85℃, add a calculated amount of isophorone diisocyanate to the reactor, and maintain the temperature for 3-4 hours. The post-treatment yields the modified chain extender.

[0009] The preparation reaction formula for the modified chain extender is as follows:

[0010]

[0011] In the formula,

[0012] The preparation reaction principle of modified chain extenders is as follows:

[0013] During the reaction, under the action of high temperature and catalyst, modified polysiloxane, polyethylene glycol and isophorone diisocyanate undergo an addition reaction. By controlling the excess of isophorone diisocyanate, an isocyanate-terminated modified chain extender is obtained.

[0014] S2. Ethylene glycol, terephthalic acid, antimony trioxide and dimethyl sulfoxide are added to a high-pressure reactor and reacted at high temperature and pressure for 2-4 hours. After that, the pressure is released and a chain extender is added to the high-pressure reactor. The reaction is kept at the temperature for 1-2 hours and then processed to obtain modified polyester.

[0015] The reaction formula for preparing modified polyester is:

[0016]

[0017] In the formula:

[0018] The reaction principle for the preparation of modified polyester is as follows:

[0019] During the reaction, under high pressure, high temperature and the action of a catalyst, ethylene glycol reacts with terephthalic acid to generate polyester. The hydroxyl groups of the polyester further react with the isocyanate groups of the modified chain extender to obtain modified polyester.

[0020] S3. Add modified polyester and auxiliary additives into a twin-screw extruder, melt extrude, and spin to obtain modified polyester fiber;

[0021] S4. The modified polyester fiber is impregnated in the finishing agent, an initiator is added, and the mixture is dipped and rubbed twice. The post-treatment yields polyester fiber.

[0022] The preparation principle of polyester fiber is as follows:

[0023] During the reaction, the finishing agent is evenly distributed on the surface of the modified polyester fiber through two dips and two nips. Under the high temperature drying of the post-treatment step, benzoyl peroxide decomposes to generate free radicals. These free radicals further initiate the free radical polymerization reaction between intermediate I in the finishing agent and the modified nanoparticles and the olefin unsaturated double bonds in the polyester molecule to obtain polyester fiber.

[0024] Further, in step S1, the ratio of the modified polysiloxane, polyethylene glycol, toluene, and catalyst is 2-4g:4-6g:200-250mL:0.5-1g, the catalyst is dibutyltin dilaurate, and the amount of isophorone diisocyanate is 0.55 times the total molar amount of hydroxyl groups in the modified polysiloxane and polyethylene glycol. The post-processing step includes: after the reaction is completed, heating the reaction vessel to 120-130℃ and distilling under reduced pressure until no liquid is collected to obtain the modified chain extender;

[0025] Further, in step S2, the ratio of ethylene glycol, terephthalic acid, antimony trioxide, dimethyl sulfoxide, and modified chain extender is 3-4g:7-8g:0.5-1g:60-80mL:3-4g, the high temperature is 120-150℃, the high pressure is 1.5-2.0MPa, and the post-processing step includes: after the reaction is completed, after the high-pressure reactor cools to room temperature, the reaction solution is transferred to a rotary evaporator at a temperature of 80-100℃, and distilled under reduced pressure until no liquid is collected to obtain modified polyester;

[0026] Further, in step S3, the weight ratio of the modified polyester to the auxiliary additive is 6-8:0.8-1, and the auxiliary additive is composed of a heat stabilizer, a lubricant, and an antioxidant in a mass ratio of 3:1:1. The heat stabilizer is one or two of dibutyltin dilaurate and triphenyl phosphate; the lubricant is one or more of calcium stearate, zinc stearate, and polyethylene wax; and the antioxidant is one or two of triphenyl phosphite and dilauryl sulfide.

[0027] Further, the spinning process includes: extruding the molten product through a spinneret and transferring it to a side-blowing chamber, where it is air-cooled and cured to obtain modified polyester fibers. The spinneret has circular channels with a mesh size of 36-48 and an aperture of 0.1-0.3 mm. The spinning pressure is 80-120 bar. The atmosphere in the side-blowing chamber is air, with a relative humidity of 30-40%, a temperature of 20-30℃, and a flow rate maintained at 5-10 m / s.

[0028] Furthermore, the temperatures of the eight temperature zones of the twin-screw extruder from the feed inlet to the discharge outlet are 280℃, 280℃, 285℃, 285℃, 295℃, 295℃, 300℃, and 300℃ respectively. The main engine speed of the twin-screw extruder is 80-120 rpm, and the pressure is 100-150 bar.

[0029] Further, in step S4, the weight ratio of the modified polyester fiber to the initiator is 10-12:0.05-0.1, the initiator is benzoyl peroxide, and the impregnation ratio is 1:30-35. The two-dip and two-nip operation steps include: impregnating the modified polyester fiber in a finishing agent at a temperature of 50-60℃ for 1-3 minutes, using a roller mill to press out excess liquid from the fiber, with a nip rate of 50-70%, and then impregnating the modified polyester fiber again in a finishing agent at a temperature of 50-60℃ for 1-3 minutes, using a roller mill to press out excess liquid from the fiber, with a nip rate of 70-80%. The post-treatment steps include: after the two-dip and two-nip process, transferring the modified polyester fiber to an oven at a temperature of 70-80℃ and drying for 3-5 minutes, then raising the oven temperature to 120-130℃ and drying for another 3-5 minutes to obtain polyester fiber.

[0030] Furthermore, the modified polysiloxane is prepared by adding 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, octamethylcyclotetrasiloxane and N,N-dimethylformamide into a reaction vessel. After the temperature of the reaction vessel is raised to 100-120°C, sodium hydroxide is added to the reaction vessel. After the reaction is kept at this temperature for 4-5 hours, an end-capping agent is added to the reaction vessel. The reaction is kept at this temperature for 2-3 hours. The modified polysiloxane is then obtained through post-treatment.

[0031] The preparation reaction formula for modified polysiloxane is as follows:

[0032]

[0033] The preparation reaction principle of modified polysiloxane is as follows:

[0034] During the reaction, under high temperature and alkaline conditions, 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane and octamethylcyclotetrasiloxane undergo ring-opening condensation. After adding the end-capping agent 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane, a further condensation reaction occurs to obtain hydroxyl-terminated modified polysiloxane.

[0035] Furthermore, the ratio of 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, octamethylcyclotetrasiloxane, toluene, sodium hydroxide, and end-capping agent is 4-5g:6-8g:100-120mL:0.3-0.5g:2-3g, and the end-capping agent is 1,3-di(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane. The post-treatment steps include: after the reaction is completed, after the reaction system cools to room temperature, adding 0.5-1mol / L dilute hydrochloric acid aqueous solution to adjust the pH to 6-7, transferring the reaction solution to a rotary evaporator at a temperature of 80-100℃, and rotary evaporating under reduced pressure until no liquid is collected to obtain modified polysiloxane.

[0036] Furthermore, the finishing agent is prepared by the following steps:

[0037] A1. Place 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, sodium hydroxide and glycidyl methacrylate in a reaction vessel and stir. Heat the reaction vessel to 90-100℃ and keep it at that temperature for 6-8 hours. After post-treatment, intermediate I is obtained.

[0038] The reaction formula for the preparation of intermediate I is as follows:

[0039]

[0040] The reaction principle for the preparation of intermediate I is as follows:

[0041] During the reaction, under the action of an alkaline catalyst and high temperature, the hydroxyl group of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol attacks the epoxy group of glycidyl methacrylate, resulting in a ring-opening reaction. Although the phenolic hydroxyl group of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol is easily deprotonated, the nucleophilicity of the phenolic salt anion generated under the action of sodium hydroxide is not as good as that of the alkoxide anion, and its steric hindrance is greater than that of the hydroxyl group. Therefore, the reactivity is low, and intermediate I is finally obtained. The mass spectrometry data of intermediate I are: m / z: 397.19 (100.0%), 398.20 (23.2%), 399.20 (3.6%), 398.19 (1.1%).

[0042] A2. Place intermediate I, modified nanoparticles and ethanol in a reaction vessel and ultrasonically disperse for 1-2 hours to obtain the finishing agent.

[0043] Further, in step A1, the ratio of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, sodium hydroxide, and glycidyl methacrylate is 8-10g:0.1-0.2g:5-7g. The post-treatment steps include: after the reaction is completed, the reaction system is cooled to room temperature, 0.5-1mol / L dilute hydrochloric acid aqueous solution is added to adjust the pH to 6-7, toluene is added to the reaction solution, extraction is performed 2-3 times, the organic phase is transferred to a rotary evaporator at a temperature of 90-100℃, and rotary evaporation is carried out under reduced pressure until no liquid is collected to obtain intermediate I; in step A2, the ratio of intermediate I, modified nanoparticles, and ethanol is 2-4g:1-2g:200-300mL.

[0044] Furthermore, the modified nanoparticles are prepared by the following steps:

[0045] B1. Place cerium nitrate hexahydrate, ethanol and deionized water in a reaction vessel and stir. Heat the reaction vessel to 60-70℃, slowly add citric acid solution, keep the reaction at the temperature for 6-8 hours, and then process to obtain crude modified nanoparticles.

[0046] B2. Add the crude modified nanoparticles into a tube furnace and calcine to obtain the modified nanoparticle precursor.

[0047] The preparation reaction principle of modified nanoparticle precursors is as follows:

[0048] During the reaction, the carboxyl and hydroxyl groups in citric acid can coordinate at multiple sites with Ce in cerium nitrate hexahydrate. 3+ It forms a cerium citrate complex, inhibiting Ce 3+ Hydrolysis forms a uniformly distributed precursor sol, yielding crude modified nanoparticles. After high-temperature calcination, the cerium citrate complex in the crude modified nanoparticles undergoes pyrolysis and combustion, releasing CO2 and H2O, and Ce2. 3+ The modified nanoparticle precursor was obtained by oxidizing it to nano-CeO2.

[0049] B3. The modified nanoparticle precursor, ethanol and deionized water are placed in a reaction vessel and stirred. Ammonia solution is added to adjust the pH to 9-10. γ-methacryloyloxypropyltrimethoxysilane and tetraethyl orthosilicate are added. The reaction vessel is heated to 50-60℃ and kept at this temperature for 1-2 hours. The modified nanoparticles are then obtained through post-treatment.

[0050] The preparation reaction principle of modified nanoparticles is as follows:

[0051] During the reaction, under alkaline conditions, the silicon-oxygen bonds of tetraethyl orthosilicate are first hydrolyzed into silanols. The silanols then undergo a condensation reaction with the hydroxyl groups on the surface of the modified nanoparticles, forming a thin layer of silica coating on the precursor of the modified nanoparticles. γ-methacryloyloxypropyltrimethoxysilane is further hydrolyzed into silanols, which then undergo a condensation reaction with the silica thin layer to obtain modified nanoparticles modified with silane coupling agents.

[0052] Further, in step B1, the ratio of cerium nitrate hexahydrate, ethanol, deionized water, and citric acid solution is 2-4g:50-70mL:50-70mL:5-10mL, and the citric acid solution is composed of citric acid, ethanol, and deionized water in a ratio of 8-10g:50-70mL:50-70mL. The post-processing step includes: after the reaction is complete, wait for the reaction system to cool to room temperature, transfer the product to an oven at 100-120℃, dry for 10-12 hours, grind the dried product, and pass it through a 500-mesh sieve to obtain crude modified nanoparticles; in step B2, the calcination operation includes: increasing the temperature at a rate of 5℃ / min... The temperature is increased to 400℃ at a certain rate and calcined for 3-4 hours to obtain the modified nanoparticle precursor. In step B3, the ratio of the modified nanoparticle precursor, ethanol, deionized water, γ-methacryloyloxypropyltrimethoxysilane solution and tetraethyl orthosilicate is 2-4g:80-120mL:10-15mL:0.5-1g:0.2-0.4g, and the concentration of the ammonia solution is 50-70wt%. The post-treatment steps include: after the reaction is completed, the reaction system is cooled to room temperature, filtered, the filter cake is washed 2-3 times with deionized water and ethanol, transferred to an oven at 60-70℃, and dried to constant weight to obtain the modified nanoparticles.

[0053] The present invention also proposes an anti-aging polyester fiber, which is prepared by the above-mentioned method for preparing an anti-aging polyester fiber.

[0054] The present invention also proposes an application of anti-aging polyester fiber, wherein the anti-aging polyester fiber prepared according to the above-mentioned method is applied to sun-protective clothing.

[0055] The present invention has the following beneficial effects:

[0056] 1. This invention prepares modified nanoparticle crude product through sol-gel method, obtains modified nanoparticle precursor through calcination, and modifies the modified nanoparticle precursor with γ-methacryloxypropyltrimethoxysilane to obtain silane coupling agent modified nanoparticles. The nano-cerium oxide in the modified nanoparticles has excellent broad-spectrum ultraviolet absorption and scattering properties, effectively blocking ultraviolet penetration, especially showing significant shielding effect on UVA and UVB bands. The modified nanoparticles are prepared as finishing agents to treat modified polyester fibers, and are stably fixed to the surface of polyester fibers through chemical grafting to form a stable and strong ultraviolet-resistant layer. This can reduce yellowing, aging and strength damage caused by ultraviolet rays to polyester fibers, and also make the whole... The treated polyester fibers possess long-lasting UV resistance. Thin-layer coating of the modified nanoparticle precursor with silica reduces the damage to the polyester molecular chains caused by CeO2 photocatalysis, improving the anti-aging properties of the polyester fibers. Simultaneously, this chemical bonding constructs a stable structure of synergistic cross-linking between inorganic particles, organic intermediates, and the polymer matrix, enhancing the bonding strength of the nanoparticles on the fiber surface and giving the fibers superior abrasion resistance. The high melting point and thermal stability of the nano-cerium oxide in the modified nanoparticles allow it to form a stable inorganic skeleton structure on the fiber surface, providing microscopic filling and reinforcement for the polyester fibers, improving their mechanical strength and abrasion resistance, and extending the fabric's service life and functional durability.

[0057] 2. This invention modifies the unsaturated double bond of an olefin on 3-(2H-benzotriazole-2-yl)-4-hydroxyphenylethanol via a ring-opening reaction to obtain intermediate I. Intermediate I is then combined with modified nanoparticles to prepare a finishing agent for UV-resistant finishing of modified polyester fibers. The benzotriazole group in intermediate I possesses excellent UV absorption capabilities, efficiently absorbing UVA and UVB wavelengths, effectively reducing UV damage to polyester fibers and preventing yellowing, aging, and strength degradation of fabrics under sunlight. Meanwhile, the modified nanoparticles enhance the UV resistance of the polyester fibers through their excellent UV scattering and shielding abilities. The combination of protective and anti-UV aging properties forms a dual-mechanism anti-UV system, synergistically improving the stability of polyester fabrics under long-term UV irradiation and extending the fabric's service life. In addition, intermediate I in the finishing agent and nano-cerium oxide undergo a free radical grafting reaction with the polyester fiber surface through olefin unsaturated double bonds, forming stable covalent bonds on the fiber surface and constructing a dense and strong finishing film. Due to its long-lasting UV resistance and stable finishing layer structure, the finished polyester fiber can significantly reduce the performance degradation caused by environmental factors such as UV light, heat, and oxygen, and improve the anti-aging performance and lifespan of textiles in outdoor environments.

[0058] 3. This invention prepares a modified silane coupling agent containing olefin unsaturated double bonds through a telomerization reaction, then uses it to prepare a modified chain extender through prepolymerization. This chain extender is then used to extend the polyester chain, resulting in modified polyester. Modified polyester fibers are obtained through melt spinning. In the chain extender synthesis stage, the modified polysiloxane is synergistically reacted with polyethylene glycol and isophorone diisocyanate to introduce flexible segments and rigid cross-linked structures, effectively improving the flexibility and toughness of the polyester main chain, enhancing the mechanical strength and abrasion resistance of the polyester fibers, and extending the service life and functional durability of textiles. The unsaturated double bonds of olefins in modified polysiloxanes provide more reaction sites for subsequent finishing agents on polyester fibers, further improving the UV aging resistance of polyester fibers. The high Si-O-Si bond energy and strong chemical inertness in the modified polysiloxane structure can effectively resist molecular chain breaking or cross-linking reactions caused by UV light, thereby slowing down the degradation rate of the polyester matrix. The polysiloxane structure can form a hydrophobic protective layer on the fiber surface, reducing the penetration of ultraviolet light, oxygen, and moisture into the fiber interior, improving the overall protection capability, and enhancing the UV aging resistance and mechanical strength of polyester fibers. Detailed Implementation

[0059] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0060] The polyethylene glycol used in this invention was purchased from Jinan Jiayang Chemical Co., Ltd. It is industrial grade, conforms to national standards, has a molecular weight of 300, and is branded as Jiayang.

[0061] Example 1

[0062] This embodiment provides a method for preparing modified nanoparticles used in finishing agents for anti-aging polyester fibers, including the following steps:

[0063] Step I: Preparation of crude modified nanoparticles

[0064] Weigh out 80g of citric acid, 500mL of ethanol and 500mL of deionized water, mix them thoroughly to obtain a citric acid solution;

[0065] Weigh 20g of cerium nitrate hexahydrate, 500mL of ethanol and 500mL of deionized water and place them in a reaction vessel and stir. Heat the reaction vessel to 60℃ and slowly add 50mL of citric acid solution. Keep the reaction vessel at this temperature for 6 hours. After the reaction is complete, wait for the reaction system to cool to room temperature and transfer the product to an oven at 100℃. Dry the product for 10 hours. Grind the dried product and pass it through a 500-mesh sieve to obtain crude modified nanoparticles.

[0066] Step II: Preparation of modified nanoparticle precursors

[0067] The modified nanoparticle crude product was added to a tube furnace and heated to 400℃ at a heating rate of 5℃ / min, and calcined for 3 hours to obtain the modified nanoparticle precursor.

[0068] Step III: Preparation of modified nanoparticles

[0069] Weigh 20g of the modified nanoparticle precursor, 800mL of ethanol and 100mL of deionized water and place them in a reaction vessel and stir. Add 50wt% ammonia solution to adjust the pH to 9, add 5g of γ-methacryloyloxypropyltrimethoxysilane and 2g of tetraethyl orthosilicate, heat the reaction vessel to 50℃ and keep it at that temperature for 1h. After the reaction is complete, wait for the reaction system to cool to room temperature, filter it, wash the filter cake twice with deionized water and ethanol, transfer it to an oven at 60℃ and dry it to constant weight to obtain the modified nanoparticles.

[0070] Example 2

[0071] This embodiment provides a method for preparing modified nanoparticles used in finishing agents for anti-aging polyester fibers, including the following steps:

[0072] Step I: Preparation of crude modified nanoparticles

[0073] Weigh out 90g of citric acid, 600mL of ethanol and 600mL of deionized water, mix them thoroughly to obtain a citric acid solution;

[0074] Weigh out 30g of cerium nitrate hexahydrate, 600mL of ethanol and 600mL of deionized water and place them in a reaction vessel and stir. Heat the reaction vessel to 65℃ and slowly add 80mL of citric acid solution. Keep the reaction vessel at this temperature for 7h. After the reaction is complete, wait for the reaction system to cool to room temperature and transfer the product to an oven at 110℃ and dry for 11h. Grind the dried product and pass it through a 500-mesh sieve to obtain crude modified nanoparticles.

[0075] Step II: Preparation of modified nanoparticle precursors

[0076] The modified nanoparticle crude product was added to a tube furnace and heated to 400℃ at a heating rate of 5℃ / min, and calcined for 3.5h to obtain the modified nanoparticle precursor.

[0077] Step III: Preparation of modified nanoparticles

[0078] Weigh 30g of the modified nanoparticle precursor, 100mL of ethanol and 130mL of deionized water and place them in a reaction vessel and stir. Add 60wt% ammonia solution to adjust the pH to 9.5, add 7g of γ-methacryloyloxypropyltrimethoxysilane and 3g of tetraethyl orthosilicate, heat the reaction vessel to 55℃ and keep it at that temperature for 1.5h. After the reaction is complete, wait for the reaction system to cool to room temperature, filter it, wash the filter cake twice with deionized water and ethanol, transfer it to an oven at 65℃ and dry it to constant weight to obtain modified nanoparticles.

[0079] Example 3

[0080] This embodiment provides a method for preparing modified nanoparticles used in finishing agents for anti-aging polyester fibers, including the following steps:

[0081] Step I: Preparation of crude modified nanoparticles

[0082] Weigh out 100g of citric acid, 700mL of ethanol and 700mL of deionized water, mix them thoroughly to obtain a citric acid solution;

[0083] Weigh out 40g of cerium nitrate hexahydrate, 700mL of ethanol and 700mL of deionized water and place them in a reaction vessel and stir. Heat the reaction vessel to 70℃ and slowly add 100mL of citric acid solution. Keep the reaction vessel at this temperature for 8 hours. After the reaction is complete, wait for the reaction system to cool to room temperature and transfer the product to an oven at 120℃ and dry it for 12 hours. Grind the dried product and pass it through a 500-mesh sieve to obtain crude modified nanoparticles.

[0084] Step II: Preparation of modified nanoparticle precursors

[0085] The modified nanoparticle crude product was added to a tube furnace and heated to 400℃ at a heating rate of 5℃ / min, and calcined for 4 hours to obtain the modified nanoparticle precursor.

[0086] Step III: Preparation of modified nanoparticles

[0087] Weigh 40g of the modified nanoparticle precursor, 1200mL of ethanol and 150mL of deionized water and place them in a reaction vessel and stir. Add 70wt% ammonia solution to adjust the pH to 10, add 10g of γ-methacryloyloxypropyltrimethoxysilane and 4g of tetraethyl orthosilicate, heat the reaction vessel to 60℃ and keep it at that temperature for 2h. After the reaction is complete, wait for the reaction system to cool to room temperature, filter it, wash the filter cake three times with deionized water and ethanol, transfer it to an oven at 70℃ and dry it to constant weight to obtain the modified nanoparticles.

[0088] Example 4

[0089] This embodiment provides a method for preparing an anti-aging finishing agent for polyester fibers, comprising the following steps:

[0090] Step ①: Preparation of intermediate I

[0091] Weigh out 80g of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, 1g of sodium hydroxide and 50g of glycidyl methacrylate and place them in a reaction vessel and stir. Heat the reaction vessel to 90℃ and keep it at that temperature for 6h. After the reaction is complete, wait for the reaction system to cool to room temperature, add 0.5mol / L dilute hydrochloric acid aqueous solution to pH 6, add toluene to the reaction solution and extract twice. Transfer the organic phase to a rotary evaporator at 90℃ and evaporate under reduced pressure until no liquid is collected to obtain intermediate I.

[0092] Step 2: Preparation of finishing agent

[0093] Weigh 20g of intermediate I, 10g of the modified nanoparticles prepared in Example 1, and 2000mL of ethanol and place them in a reaction vessel. Disperse them ultrasonically for 1h to obtain the finishing agent.

[0094] Example 5

[0095] This embodiment provides a method for preparing an anti-aging finishing agent for polyester fibers, comprising the following steps:

[0096] Step ①: Preparation of intermediate I

[0097] Weigh out 90g of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, 1.5g of sodium hydroxide, and 60g of glycidyl methacrylate and place them in a reaction vessel. Stir the vessel and heat it to 95℃. Keep the temperature for 7 hours. After the reaction is complete, let the reaction system cool to room temperature and add 1mol / L dilute hydrochloric acid aqueous solution to adjust the pH to 6.5. Add toluene to the reaction solution and extract three times. Transfer the organic phase to a rotary evaporator at 95℃ and evaporate under reduced pressure until no liquid is collected to obtain intermediate I.

[0098] Step 2: Preparation of finishing agent

[0099] Weigh out 30g of intermediate I, 15g of the modified nanoparticles prepared in Example 2, and 2500mL of ethanol and place them in a reaction vessel. Disperse them ultrasonically for 1.5h to obtain the finishing agent.

[0100] Example 6

[0101] This embodiment provides a method for preparing an anti-aging finishing agent for polyester fibers, comprising the following steps:

[0102] Step ①: Preparation of intermediate I

[0103] Weigh 100g of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, 2g of sodium hydroxide, and 70g of glycidyl methacrylate and place them in a reaction vessel and stir. Heat the reaction vessel to 100℃ and keep it at that temperature for 8 hours. After the reaction is complete, let the reaction system cool to room temperature, add 1mol / L dilute hydrochloric acid aqueous solution to adjust the pH to 7, add toluene to the reaction solution, extract 3 times, transfer the organic phase to a rotary evaporator at 100℃, and evaporate under reduced pressure until no liquid is collected to obtain intermediate I.

[0104] Step 2: Preparation of finishing agent

[0105] Weigh out 40g of intermediate I, 20g of the modified nanoparticles prepared in Example 3, and 3000mL of ethanol and place them in a reaction vessel. Disperse them ultrasonically for 2 hours to obtain the finishing agent.

[0106] Example 7

[0107] This embodiment provides a method for preparing modified polysiloxane for anti-aging polyester fiber, including the following steps:

[0108] Weigh out 40g of 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, 60g of octamethylcyclotetrasiloxane, and 1000mL of N,N-dimethylformamide and add them to a reaction vessel. After the temperature of the reaction vessel is raised to 100℃, add 3g of sodium hydroxide to the reaction vessel and keep it at this temperature for 4h. Then add 20g of 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane to the reaction vessel and keep it at this temperature for 2h. After the reaction is complete, wait for the reaction system to cool to room temperature, add 0.5mol / L dilute hydrochloric acid aqueous solution to adjust the pH to 6, and then transfer the reaction solution to a rotary evaporator at 80℃. Evaporate under reduced pressure until no liquid is collected to obtain modified polysiloxane.

[0109] Example 8

[0110] This embodiment provides a method for preparing modified polysiloxane for anti-aging polyester fiber, including the following steps:

[0111] Weigh out 45g of 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, 70g of octamethylcyclotetrasiloxane, and 1100mL of N,N-dimethylformamide and add them to a reaction vessel. After the temperature of the reaction vessel is raised to 110℃, add 4g of sodium hydroxide to the reaction vessel and keep the reaction at this temperature for 4.5h. Then add 25g of 1,3-di(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane to the reaction vessel and keep the reaction at this temperature for 2.5h. After the reaction is complete, wait for the reaction system to cool to room temperature, add 1mol / L dilute hydrochloric acid aqueous solution to adjust the pH to 6.5, and then transfer the reaction solution to a rotary evaporator at a temperature of 90℃. Evaporate under reduced pressure until no liquid is collected to obtain modified polysiloxane.

[0112] Example 9

[0113] This embodiment provides a method for preparing modified polysiloxane for anti-aging polyester fiber, including the following steps:

[0114] Weigh out 50g of 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, 80g of octamethylcyclotetrasiloxane, and 1200mL of N,N-dimethylformamide and add them to a reaction vessel. After the temperature of the reaction vessel is raised to 120℃, add 5g of sodium hydroxide to the reaction vessel and keep it at this temperature for 5h. Then add 30g of 1,3-di(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane to the reaction vessel and keep it at this temperature for 3h. After the reaction is complete, wait for the reaction system to cool to room temperature, add 1mol / L dilute hydrochloric acid aqueous solution to adjust the pH to 7, and then transfer the reaction solution to a rotary evaporator at 100℃. Evaporate under reduced pressure until no liquid is collected to obtain modified polysiloxane.

[0115] Example 10

[0116] This embodiment provides a method for preparing anti-aging polyester fiber, including the following steps:

[0117] Step 1: Preparation of modified chain extender

[0118] Weigh out 20g of the modified polysiloxane prepared in Example 7, 40g of polyethylene glycol, 2000mL of toluene, and 5g of dibutyltin dilaurate and add them to a nitrogen-protected reactor. Stir the reactor and raise the temperature to 120°C. Maintain the temperature for 8 hours. Lower the temperature of the reactor to 75°C and add isophorone diisocyanate to the reactor at 0.55 times the total molar amount of hydroxyl groups of the modified polysiloxane and polyethylene glycol. Maintain the temperature for 3 hours. After the reaction is complete, raise the temperature of the reactor to 120°C and distill under reduced pressure until no liquid is collected to obtain the modified chain extender.

[0119] Step 2: Preparation of modified polyester

[0120] Weigh out ethylene glycol, terephthalic acid, antimony trioxide, and dimethyl sulfoxide and add them to a high-pressure reactor. Heat the reactor to 120°C and pressurize it to 1.5 MPa. After reacting for 2 hours, release the pressure and continue adding the modified chain extender to the reactor. Keep the reactor at this temperature for 1 hour. After the reaction is complete, wait for the reactor to cool to room temperature and then transfer the reaction solution to a rotary evaporator at 80°C. Distill under reduced pressure until no liquid is collected to obtain the modified polyester.

[0121] Step 3: Preparation of modified polyester fibers

[0122] Triphenyl phosphate, calcium stearate and triphenyl phosphite were mixed evenly in a mass ratio of 3:1:1 to obtain an auxiliary additive, which was then set aside.

[0123] Weigh out 600g of modified polyester and 80g of auxiliary additives and add them to a twin-screw extruder. Melt extrusion is performed, and the molten product is extruded through a spinneret and transferred to a side-blowing chamber. After air cooling and curing, modified polyester fiber is obtained.

[0124] The spinneret has circular channels with a mesh count of 36 and an aperture of 0.1 mm. The spinneret pressure is 80 bar. The atmosphere in the side blowing chamber is air with a relative humidity of 30% and a temperature of 20°C. The flow rate is maintained at 5 m / s.

[0125] The twin-screw extruder has eight temperature zones from the feed inlet to the discharge outlet, with temperatures of 280℃, 280℃, 285℃, 285℃, 295℃, 295℃, 300℃, and 300℃ respectively. The main motor speed of the twin-screw extruder is 80 rpm, and the pressure is 100 bar.

[0126] Step 4: Preparation of polyester fibers

[0127] Weigh: 1000g of modified polyester fiber was immersed in the finishing agent prepared in Example 4, and 5g of benzoyl peroxide was added. The modified polyester fiber was immersed in the finishing agent at 50°C for 1 minute. The excess liquid was pressed out of the fiber using a roller mill, with a roll rate of 50%. The modified polyester fiber was immersed in the finishing agent at 50°C for 1 minute again, and the excess liquid was pressed out of the fiber using a roller mill, with a roll rate of 70%. The modified polyester fiber was transferred to an oven at 70°C and dried for 3 minutes. The oven temperature was raised to 120°C and dried for 3 minutes to obtain polyester fiber.

[0128] Example 11

[0129] This embodiment provides a method for preparing anti-aging polyester fiber, including the following steps:

[0130] Step 1: Preparation of modified chain extender

[0131] Weigh out 30g of the modified polysiloxane prepared in Example 8, 50g of polyethylene glycol, 2250mL of toluene, and 7g of dibutyltin dilaurate, and add them to a nitrogen-protected reactor. Stir the reactor and raise the temperature to 125°C. Maintain the temperature for 9 hours. Lower the temperature of the reactor to 80°C and add isophorone diisocyanate to the reactor at 0.55 times the total molar amount of hydroxyl groups of the modified polysiloxane and polyethylene glycol. Maintain the temperature for 3.5 hours. After the reaction is complete, raise the temperature of the reactor to 125°C and distill under reduced pressure until no liquid is collected to obtain the modified chain extender.

[0132] Step 2: Preparation of modified polyester

[0133] Weigh out ethylene glycol, terephthalic acid, antimony trioxide, and dimethyl sulfoxide and add them to a high-pressure reactor. Heat the reactor to 135°C and pressurize it to 2.0 MPa. After reacting for 3 hours, release the pressure and continue adding the modified chain extender to the reactor. Keep the reactor at this temperature for 1.5 hours. After the reaction is complete, wait for the reactor to cool to room temperature and then transfer the reaction solution to a rotary evaporator at 90°C. Distill under reduced pressure until no liquid is collected to obtain the modified polyester.

[0134] Step 3: Preparation of modified polyester fibers

[0135] Triphenyl phosphate, calcium stearate and triphenyl phosphite were mixed evenly in a mass ratio of 3:1:1 to obtain an auxiliary additive, which was then set aside.

[0136] Weigh out 700g of modified polyester and 90g of auxiliary additives and add them to a twin-screw extruder. Melt extrusion is performed, and the molten product is extruded through a spinneret and transferred to a side-blowing chamber. After air cooling and curing, modified polyester fiber is obtained.

[0137] The spinneret has circular channels with a mesh count of 42 and an aperture of 0.2 mm. The spinneret pressure is 100 bar. The atmosphere in the side blowing chamber is air with a relative humidity of 35% and a temperature of 25°C. The flow rate is maintained at 7 m / s.

[0138] The twin-screw extruder has eight temperature zones from the feed inlet to the discharge outlet, with temperatures of 280℃, 280℃, 285℃, 285℃, 295℃, 295℃, 300℃, and 300℃ respectively. The main motor speed of the twin-screw extruder is 100 rpm, and the pressure is 125 bar.

[0139] Step 4: Preparation of polyester fibers

[0140] Weigh: 1100g of modified polyester fiber was immersed in the finishing agent prepared in Example 5, and 7g of benzoyl peroxide was added. The modified polyester fiber was immersed in the finishing agent at 55°C for 2 minutes. The excess liquid was pressed out of the fiber using a roller mill, with a roll rate of 60%. The modified polyester fiber was immersed in the finishing agent at 55°C for 2 minutes again, and the excess liquid was pressed out of the fiber using a roller mill, with a roll rate of 75%. The modified polyester fiber was transferred to an oven at 75°C and dried for 4 minutes. The oven temperature was raised to 125°C and dried for 4 minutes to obtain polyester fiber.

[0141] Example 12

[0142] This embodiment provides a method for preparing anti-aging polyester fiber, including the following steps:

[0143] Step 1: Preparation of modified chain extender

[0144] Weigh out 40g of the modified polysiloxane prepared in Example 9, 60g of polyethylene glycol, 2500mL of toluene, and 10g of dibutyltin dilaurate and add them to a nitrogen-protected reactor. Stir the reactor and raise the temperature to 130°C. Maintain the temperature for 10 hours. Lower the temperature of the reactor to 85°C and add isophorone diisocyanate to the reactor at 0.55 times the total molar amount of hydroxyl groups of the modified polysiloxane and polyethylene glycol. Maintain the temperature for 4 hours. After the reaction is complete, raise the temperature of the reactor to 130°C and distill under reduced pressure until no liquid is collected to obtain the modified chain extender.

[0145] Step 2: Preparation of modified polyester

[0146] Weigh out ethylene glycol, terephthalic acid, antimony trioxide, and dimethyl sulfoxide and add them to a high-pressure reactor. Heat the reactor to 150°C and pressurize it to 2.0 MPa. After reacting for 4 hours, release the pressure and continue to add the modified chain extender to the reactor. Keep the reactor at this temperature for 2 hours. After the reaction is complete, wait for the reactor to cool to room temperature and then transfer the reaction solution to a rotary evaporator at 100°C. Distill under reduced pressure until no liquid is collected to obtain the modified polyester.

[0147] Step 3: Preparation of modified polyester fibers

[0148] Triphenyl phosphate, calcium stearate and triphenyl phosphite were mixed evenly in a mass ratio of 3:1:1 to obtain an auxiliary additive, which was then set aside.

[0149] Weigh out 800g of modified polyester and 100g of auxiliary additives and add them to a twin-screw extruder. Melt extrusion is performed, and the molten product is extruded through a spinneret and transferred to a side-blowing chamber. After air cooling and curing, modified polyester fiber is obtained.

[0150] The spinneret has circular channels with a mesh count of 48 and an aperture of 0.3 mm. The spinneret pressure is 120 bar. The atmosphere in the side blowing chamber is air with a relative humidity of 40% and a temperature of 30°C. The flow rate is maintained at 10 m / s.

[0151] The twin-screw extruder has eight temperature zones with temperatures ranging from the feed inlet to the discharge outlet: 280℃, 280℃, 285℃, 285℃, 295℃, 295℃, 300℃, and 300℃. The main motor speed of the twin-screw extruder is 120 rpm, and the pressure is 150 bar.

[0152] Step 4: Preparation of polyester fibers

[0153] Weigh: 1200g of modified polyester fiber was immersed in the finishing agent prepared in Example 6, and 10g of benzoyl peroxide was added. The modified polyester fiber was immersed in the finishing agent at 60°C for 3 minutes. The excess liquid was pressed out of the fiber using a roller mill, with a roll rate of 70%. The modified polyester fiber was immersed in the finishing agent at 60°C for 3 minutes again, and the excess liquid was pressed out of the fiber using a roller mill, with a roll rate of 80%. The modified polyester fiber was transferred to an oven at 80°C and dried for 5 minutes. The oven temperature was raised to 130°C and dried for 5 minutes to obtain polyester fiber.

[0154] Comparative Example 1

[0155] The difference between this comparative example and Example 12 is that, in step ②, when preparing the finishing agent, the modified nanoparticle precursor is used in an equal amount to replace the modified nanoparticles.

[0156] Comparative Example 2

[0157] The difference between this comparative example and Example 12 is that in step one, the modified chain extender is prepared, and the addition of modified polysiloxane is omitted.

[0158] Comparative Example 3

[0159] The difference between this comparative example and Example 12 is that the finishing agent was omitted in step four when preparing the polyester fibers.

[0160] Performance testing:

[0161] The breaking strength and elongation at break of the polyester fibers prepared in Examples 10-12 and Comparative Examples 1-3 were tested in accordance with the standard GB / T 14337-2022 "Test Method for Tensile Properties of Chemical Fibers (Short Fibers)".

[0162] The volumetric abrasion of the polyester fibers prepared in Examples 10-12 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 9867-2008 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber (rotary roller abrasion tester method)".

[0163] The polyester fibers prepared in Examples 10-12 and Comparative Examples 1-3 were subjected to ultraviolet aging tests in accordance with the standard GB / T 16422.3-2022 "Laboratory Light Source Exposure Test Methods for Plastics - Part 3: Fluorescent Ultraviolet Lamps". The breaking strength retention rate, breaking elongation retention rate and volumetric abrasion change rate of the modified polyester fibers after ultraviolet aging were calculated in accordance with the standards GB / T14337-2022 and GB / T 9867-2008, respectively. The specific data are shown in Table 1.

[0164] Table 1 - Performance Test Data for Each Sample

[0165]

[0166]

[0167] Data Analysis:

[0168] A comparative analysis of the data in Table 1 reveals that the tensile strength of the polyester fiber prepared by this invention is 6.1 cN·dtex. -1 The elongation at break is 32%, and the volumetric wear is 32 mm. 3 Meanwhile, after UV aging, the tensile strength retention rate was 99.1%, the tensile elongation retention rate was 99.3%, and the volumetric wear change rate was 103.8%, all of which were superior to the comparative example. All performance test data were also superior to the comparative example. Therefore, this invention prepares a modified polysiloxane containing unsaturated olefin double bonds and hydroxyl-terminated polysiloxane through a telomerization reaction. This modified polysiloxane is then reacted with polyethylene glycol and isophorone diisocyanate through an addition reaction to prepare a modified chain extender. A chain extension reaction is then performed on polyester to obtain modified polyester. The modified polyester fiber is then melt-spun to obtain modified polyester fiber. A modified nanoparticle precursor is prepared through a sol-gel reaction. Modified nanoparticles are obtained through silane coupling agent coating modification. These nanoparticles are then prepared with intermediate I to form a finishing agent. A free radical grafting reaction is then performed on the modified polyester fiber to obtain polyester fiber. This not only improves the UV aging resistance of polyester fiber but also enhances its abrasion resistance and mechanical strength.

[0169] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing anti-aging polyester fiber, characterized in that, Includes the following steps: S1. Add modified polysiloxane, polyethylene glycol, toluene and catalyst to a nitrogen-protected reactor and stir. Raise the reactor temperature to 120-130℃ and maintain the temperature for 8-10 hours. Lower the reactor temperature to 75-85℃, add a calculated amount of isophorone diisocyanate to the reactor, and maintain the temperature for 3-4 hours. The post-treatment yields the modified chain extender. S2. Ethylene glycol, terephthalic acid, antimony trioxide and dimethyl sulfoxide are added to a high-pressure reactor and reacted at high temperature and pressure for 2-4 hours. After that, the pressure is released and a chain extender is added to the high-pressure reactor. The reaction is kept at the temperature for 1-2 hours and then processed to obtain modified polyester. S3. Add modified polyester and auxiliary additives into a twin-screw extruder, melt extrude, and spin to obtain modified polyester fiber; S4. The modified polyester fiber is impregnated in the finishing agent, an initiator is added, and the mixture is dipped and rubbed twice. The post-treatment yields polyester fiber.

2. The method for preparing an anti-aging polyester fiber according to claim 1, characterized in that, In step S1, the ratio of modified polysiloxane, polyethylene glycol, toluene, and catalyst is 2-4g:4-6g:200-250mL:0.5-1g, the catalyst is dibutyltin dilaurate, and the amount of isophorone diisocyanate is 0.55 times the total molar amount of hydroxyl groups in the modified polysiloxane and polyethylene glycol; in step S2, the ratio of ethylene glycol, terephthalic acid, antimony trioxide, dimethyl sulfoxide, and modified chain extender is 3-4g:7-8g:0.5-1g:60-80mL:3-4g; in step S3, the weight ratio of modified polyester and auxiliary additives is 6-8:0.8-1; in step S4, the weight ratio of modified polyester fiber and initiator is 10-12: 0.05-0.1, wherein the initiator is benzoyl peroxide.

3. The method for preparing an anti-aging polyester fiber according to claim 1, characterized in that, The modified polysiloxane is prepared by adding 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, octamethylcyclotetrasiloxane and N,N-dimethylformamide into a reaction vessel. After the temperature of the reaction vessel is raised to 100-120℃, sodium hydroxide is added to the reaction vessel. After the reaction is kept at this temperature for 4-5 hours, an end-capping agent is added to the reaction vessel. The reaction is kept at this temperature for 2-3 hours. The modified polysiloxane is then obtained through post-treatment.

4. The method for preparing an anti-aging polyester fiber according to claim 3, characterized in that, The ratio of 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, octamethylcyclotetrasiloxane, toluene, sodium hydroxide, and the capping agent is 4-5g:6-8g:100-120mL:0.3-0.5g:2-3g, and the capping agent is 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane.

5. The method for preparing an anti-aging polyester fiber according to claim 1, characterized in that, The finishing agent is prepared by the following steps: A1. Place 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, sodium hydroxide and glycidyl methacrylate in a reaction vessel and stir. Heat the reaction vessel to 90-100℃ and keep it at that temperature for 6-8 hours. After post-treatment, intermediate I is obtained. A2. Place intermediate I, modified nanoparticles and ethanol in a reaction vessel and ultrasonically disperse for 1-2 hours to obtain the finishing agent.

6. The method for preparing an anti-aging polyester fiber according to claim 5, characterized in that, In step A1, the ratio of 3-(2H-benzotriazol-2-yl)-4-hydroxyphenylethanol, sodium hydroxide, and glycidyl methacrylate is 8-10g:0.1-0.2g:5-7g; in step A2, the ratio of intermediate I, modified nanoparticles, and ethanol is 2-4g:1-2g:200-300mL.

7. The method for preparing an anti-aging polyester fiber according to claim 5, characterized in that, The modified nanoparticles were prepared by the following steps: B1. Place cerium nitrate hexahydrate, ethanol and deionized water in a reaction vessel and stir. Heat the reaction vessel to 60-70℃, slowly add citric acid solution, keep the reaction at the temperature for 6-8 hours, and then process to obtain crude modified nanoparticles. B2. Add the crude modified nanoparticles into a tube furnace and calcine to obtain the modified nanoparticle precursor. B3. The modified nanoparticle precursor, ethanol and deionized water are placed in a reaction vessel and stirred. Ammonia solution is added to adjust the pH to 9-10. γ-methacryloyloxypropyltrimethoxysilane and tetraethyl orthosilicate are added. The reaction vessel is heated to 50-60℃ and kept at this temperature for 1-2 hours. The modified nanoparticles are then obtained after post-treatment.

8. The method for preparing an anti-aging polyester fiber according to claim 7, characterized in that, In step B1, the ratio of cerium nitrate hexahydrate, ethanol, deionized water, and citric acid solution is 2-4g:50-70mL:50-70mL:5-10mL, and the citric acid solution is composed of citric acid, ethanol, and deionized water in a ratio of 8-10g:50-70mL:50-70mL. In step B2, the calcination operation includes heating to 400℃ at a heating rate of 5℃ / min and calcining for 3-4 hours to obtain the modified nanoparticle precursor. In step B3, the ratio of the modified nanoparticle precursor, ethanol, deionized water, γ-methacryloyloxypropyltrimethoxysilane solution, and tetraethyl orthosilicate is 2-4g:80-120mL:10-15mL:0.5-1g:0.2-0.4g, and the concentration of the ammonia solution is 50-70wt%.

9. An anti-aging polyester fiber, characterized in that, The anti-aging polyester fiber is prepared by the method for preparing anti-aging polyester fiber as described in any one of claims 1-8.

10. An application of an anti-aging polyester fiber, characterized in that, The anti-aging polyester fiber described in claim 9 is applied to sun-protective clothing.

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