Antistatic polyester fiber and its use

Abstract

This application discloses an antistatic polyester fiber and its applications. One application provides an antistatic polyester fiber, wherein the raw material components of the antistatic polyester fiber are proportioned as follows: 100 parts PET resin, 20-30 parts hydrophilic polyurethane prepolymer, 4-8 parts antibacterial modified nano-titanium dioxide, 8-14 parts compatibilizer, 6-10 parts carbon nanotubes, 4-6 parts carbodiimide, and 1.6-4.8 parts ATO antistatic agent. Furthermore, this application provides a method for preparing the above-mentioned antistatic polyester fiber and its applications. The fiber exhibits superior strength and toughness, durable antistatic function, good moisture absorption, and relatively excellent resistance to damp heat aging.

Description

Technical Field

[0001] This application relates to the field of automotive interior materials technology, and in particular to an antistatic polyester fiber and its applications. Background Technology

[0002] As consumer demand for automobiles continues to rise, so too does the requirement for automotive interior environments. This has spurred the development of automotive interior materials towards environmental friendliness, health benefits, and functionality. Polyester, as one of the most widely used synthetic fibers globally, is widely used as a surface material in automotive interiors due to its relatively superior overall performance. In particular, polyester fibers are commonly used in car seat covers and carpets. However, polyester has extremely poor moisture absorption and is more prone to static electricity compared to highly absorbent fibers. This presents more difficulties in the textile processing of polyester and leads to problems such as poor comfort during use.

[0003] Existing technologies for antistatic treatment of polyester fibers generally employ surface finishing methods. These methods include hydrophilic surface finishing, antistatic agent surface finishing, and composite surface finishing. While these surface treatments can withstand multiple washes, maintaining their antistatic effect even after dozens of washes, their durability is not ideal for the specific application of automotive interior materials. Polyester interior products such as car seat covers and carpets face frequent wear and tear during use. This fatigue wear causes the functional coating formed by surface finishing to peel off, resulting in the loss of antistatic function. Therefore, while antistatic polyester fibers produced using existing technologies exhibit relatively long-lasting antistatic properties for clothing production, they generally fail to achieve durable antistatic properties when used in automotive interior products such as seat covers and carpets.

[0004] Therefore, designing a polyester fiber with durable antistatic properties that can be used in automotive interior materials is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In order to solve at least one of the above-mentioned technical problems, and to develop a polyester fiber for automotive interiors with superior strength and toughness, durable antistatic function, good moisture absorption, and relatively excellent resistance to damp heat aging, this application provides an antistatic polyester fiber and its application.

[0006] On one hand, this application provides an antistatic polyester fiber, wherein the mass ratio of each raw material component of the antistatic polyester fiber includes: 100 parts of PET resin, 20-30 parts of hydrophilic polyurethane prepolymer, 4-8 parts of antibacterial modified nano titanium dioxide, 8-14 parts of compatibilizer, 6-10 parts of carbon nanotubes, 4-6 parts of carbodiimide, and 1.6-4.8 parts of ATO antistatic agent.

[0007] Optionally, the mass ratio of each raw material component of the antistatic polyester fiber includes: 100 parts of PET resin, 24-26 parts of hydrophilic polyurethane prepolymer, 6-6.5 parts of antibacterial modified nano titanium dioxide, 10-12 parts of compatibilizer, 8-8.6 parts of carbon nanotubes, 4.8-5.2 parts of carbodiimide, and 3.4-3.8 parts of ATO antistatic agent.

[0008] Optionally, the hydrophilic polyurethane prepolymer may use 401-70 MPA / X type hydrophilic IPDI curing agent as the isocyanate curing agent.

[0009] Optionally, the hydrophilic polyurethane prepolymer may use polyethylene glycol monomethyl ether as the hydrophilic alcohol monomer.

[0010] Optionally, the preparation of the hydrophilic polyurethane prepolymer includes the following steps:

[0011] Sa-1, mix 401-70 MPA / X type hydrophilic IPDI curing agent, polyethylene glycol monomethyl ether and eugenol thoroughly at a mass ratio of 100:20~24:8~10 to obtain a premix;

[0012] Sb-1. Add 8% of trimethylolpropane and 4% of triethylamine to the premix, then add 0.05% of dibutyltin dilaurate and 0.25% of quaternary ammonium salt to the premix. After thorough mixing, a reaction solution is obtained.

[0013] Sc-1: The reaction solution was reacted at 24~28℃ for 4 hours under nitrogen protection, and then the temperature was raised to 60~65℃ for 0.5 hours. After cooling, a hydrophilic polyurethane prepolymer was obtained.

[0014] Optionally, the preparation of the antibacterial modified nano-titanium dioxide includes the following steps:

[0015] Sa-2. Based on titanium dioxide, accurately weigh 20% titanium dioxide sol and silver nitrate at a molar ratio of 1:0.06. Add silver nitrate to the titanium dioxide sol. Accurately weigh ethylenediamide at a molar ratio of 1:1 and add it to the titanium dioxide sol. After thorough mixing, sonicate for more than 30 minutes to obtain the sol solution.

[0016] Sb-2: The sol solution was rotary evaporated at 80-85 degrees Celsius to constant weight to obtain a colloid;

[0017] Sc-2: The colloid was calcined at 500~550℃ for 1 hour, and then ground to a particle size of 50~100nm to obtain antibacterial modified nano titanium dioxide.

[0018] Optionally, the antimony doping amount in the ATO antistatic agent is 3.5~4%.

[0019] Secondly, this application provides a method for preparing the above-mentioned antistatic polyester fiber, comprising the following steps:

[0020] S1. Preparation of hydrophilic polyurethane prepolymer and antibacterial modified nano-titanium dioxide;

[0021] S2. Add the ATO antistatic agent of the formula amount to the hydrophilic polyurethane prepolymer, mix and disperse thoroughly, then add the remaining raw materials of the formula amount to the hydrophilic polyurethane prepolymer, mix thoroughly, and obtain the premix.

[0022] S3. Add the premixed material to a twin-screw extruder, and after melt extrusion and granulation, obtain antistatic polyester masterbatch;

[0023] S4. Antistatic polyester masterbatch is processed by hot melt spinning to obtain antistatic polyester fiber.

[0024] Optionally, in step S3, the process parameters for extrusion granulation are as follows: the temperatures of the six temperature zones are 175℃, 180℃, 185℃, 190℃, 185℃, and 180℃ respectively.

[0025] Thirdly, this application provides the application of the aforementioned antistatic polyester fiber in the field of automotive interior textile fabrics.

[0026] In summary, the present invention has at least one of the following beneficial technical effects:

[0027] 1. This application uses ATO antistatic agent as a functional filler and hydrophilic polyurethane prepolymer as a modifier to physically blend and crosslink the PET resin. Based on the oleophobicity of ATO antistatic agent, the above design can use the hydrophilic polyurethane prepolymer as a carrier to disperse the ATO antistatic agent, allowing it to be uniformly distributed in the PET resin through the crosslinked network formed after the polyurethane prepolymer cures. The hydrophilic polyurethane crosslinked network has good hygroscopicity, which can form a dense conductive network in the resin through moisture absorption. Combined with the conductive effect of ATO antistatic agent, the antistatic properties of the material can be greatly improved.

[0028] 2. This application employs physical and chemical crosslinking modification of PET resin to perform antistatic functionalization treatment, forming a dense conductive network within the resin. Unlike traditional surface treatments, the design of this application is completely unaffected by wear and other issues, enabling the fibers to possess durable antistatic properties. Furthermore, the introduction of the polyurethane crosslinking network, combined with the addition of carbodiimide, effectively improves the strength and toughness of the material, while ensuring that the material, while being hydrophilic, also possesses stable hydrolysis resistance.

[0029] 3. This application adds antibacterial modified nano-titanium dioxide and carbon nanotubes as functional fillers to the material system, which can effectively improve the material's resistance to photothermal aging, wear resistance and antibacterial properties; it can effectively prevent the absorption of sweat caused by the material's moisture absorption, which in turn leads to the growth of bacteria on the surface. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the embodiments.

[0031] This application provides an antistatic polyester fiber, wherein the raw material components of the antistatic polyester fiber are proportioned as follows: 100 parts of PET resin, 20-30 parts of hydrophilic polyurethane prepolymer, 4-8 parts of antibacterial modified nano titanium dioxide, 8-14 parts of compatibilizer, 6-10 parts of carbon nanotubes, 4-6 parts of carbodiimide, and 1.6-4.8 parts of ATO antistatic agent.

[0032] The preparation method of the above-mentioned antistatic polyester fiber includes the following steps:

[0033] S1. Preparation of hydrophilic polyurethane prepolymer and antibacterial modified nano-titanium dioxide;

[0034] S2. Add the ATO antistatic agent of the formula amount to the hydrophilic polyurethane prepolymer, mix and disperse thoroughly, then add the remaining raw materials of the formula amount to the hydrophilic polyurethane prepolymer, mix thoroughly, and obtain the premix.

[0035] S3. Add the premixed material to a twin-screw extruder, and after melt extrusion and granulation, obtain antistatic polyester masterbatch;

[0036] S4. Antistatic polyester masterbatch is processed by hot melt spinning to obtain antistatic polyester fiber.

[0037] The aforementioned antistatic polyester fibers are mainly used in the field of automotive interior textile fabrics.

[0038] Prior to this application, most antistatic functionalized polyester fibers prepared in the prior art employed surface finishing processes. These functionalized polyester fibers were not wear-resistant and lacked durability. While adding antistatic agents through physical blending modification could improve the antistatic properties of polyester fibers to some extent, most existing antistatic agents are hydrophilic and incompatible with hydrophobic polyester materials, making co-dispersion difficult. To achieve uniform dispersion of the antistatic agent in the polyester material, complex hydrophobic treatment of the antistatic agent is required. However, the resulting antistatic polyester fibers lack hydrophilicity, and even with the antistatic agent, their antistatic properties are poor.

[0039] This application introduces a hydrophilic polyurethane crosslinking network, using hydrophilic polyurethane as a carrier, which enables the antistatic agent to be dispersed within the polyurethane crosslinking network, thereby achieving uniform distribution in the polyester material. The construction of the hydrophilic polyurethane crosslinking network imparts a certain degree of hydrophilicity to the polyester material. Utilizing the hygroscopic properties of the polyurethane crosslinking network, a dense conductive network can be formed within the polyester fibers, significantly improving the material's antistatic properties.

[0040] Furthermore, to prevent the hydrophilic modification from causing the polyester fibers to absorb sweat and breed bacteria, thus affecting the user's health, and also to prevent bacterial growth from accelerating the aging of the material, this application also designs an antibacterial system. The antibacterial system of this application gives the material a good antibacterial effect, effectively preventing bacterial growth and ensuring the user's health and the stability of the material.

[0041] The following are preparation examples and embodiments of this application.

[0042] The main raw materials used in the embodiments of this application are all commercially available.

[0043] Among them, PET resin was purchased from Hubei Jusheng Technology Co., Ltd.; 401-70 MPA / X type hydrophilic IPDI curing agent was purchased from Guangzhou Haoyi New Material Technology Co., Ltd.; polyethylene glycol divinyl ether was purchased from Shanghai Huayuan Century Trading Co., Ltd.; polyethylene glycol monomethyl ether was purchased from Shandong Xinyida Chemical Technology Co., Ltd.; eugenol, purity above 99.5%, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; dibutyltin dilaurate was purchased from Merck Chemicals; nano titanium dioxide sol, 50nm, concentration 20%, isopropanol solvent, was purchased from Ningbo Begal New Material Co., Ltd.; silver nitrate was purchased from Merck Chemicals; polyvinylpyrrolidone copolymer, VA64, was purchased from Shanghai Caiyou Industrial Co., Ltd.; carbon nanotubes were purchased from Nanjing Xianfeng Nanomaterials Technology Co., Ltd.; carbodiimide was purchased from Merck Chemicals; and ATO antistatic agent, customized according to the formula, was purchased from Shanghai Huzheng Industrial Co., Ltd.

[0044] The following is a preparation example of this application.

[0045] Preparation Example 1

[0046] The preparation of the hydrophilic polyurethane prepolymer in this example includes the following steps:

[0047] Sa-1, mix 401-70 MPA / X type hydrophilic IPDI curing agent, polyethylene glycol monomethyl ether and eugenol in a mass ratio of 100:20:8 to obtain a premix;

[0048] Sb-1. Add 8% of the total mass of trimethylolpropane and 4% of the total mass of triethylamine to the premix, then add 0.05% of the total mass of dibutyltin dilaurate and 0.25% of the total mass of tetrabutylammonium bromide. After thorough mixing, a reaction solution is obtained.

[0049] Sc-1: The reaction solution was reacted at 24~28℃ for 4 hours under nitrogen protection, and then the temperature was raised to 60~65℃ for 0.5 hours. After cooling, a hydrophilic polyurethane prepolymer was obtained.

[0050] Preparation Example 2

[0051] The preparation of the hydrophilic polyurethane prepolymer in this example includes the following steps:

[0052] Sa-1, mix 401-70 MPA / X type hydrophilic IPDI curing agent, polyethylene glycol monomethyl ether and eugenol in a mass ratio of 100:24:10 to obtain a premix;

[0053] Sb-1. Add 8% of the total mass of trimethylolpropane and 4% of the total mass of triethylamine to the premix, then add 0.05% of the total mass of dibutyltin dilaurate and 0.25% of the total mass of tetrabutylammonium bromide. After thorough mixing, a reaction solution is obtained.

[0054] Sc-1: The reaction solution was reacted at 24~28℃ for 4 hours under nitrogen protection, and then the temperature was raised to 60~65℃ for 0.5 hours. After cooling, a hydrophilic polyurethane prepolymer was obtained.

[0055] Preparation Example 3

[0056] The preparation of the hydrophilic polyurethane prepolymer in this example includes the following steps:

[0057] Sa-1, 401-70 MPA / X type hydrophilic IPDI curing agent, polyethylene glycol monomethyl ether and eugenol are thoroughly mixed in a mass ratio of 100:22:9.2 to obtain a premix;

[0058] Sb-1. Add 8% of the total mass of trimethylolpropane and 4% of the total mass of triethylamine to the premix, then add 0.05% of the total mass of dibutyltin dilaurate and 0.25% of the total mass of tetrabutylammonium bromide. After thorough mixing, a reaction solution is obtained.

[0059] Sc-1: The reaction solution was reacted at 24~28℃ for 4 hours under nitrogen protection, and then the temperature was raised to 60~65℃ for 0.5 hours. After cooling, a hydrophilic polyurethane prepolymer was obtained.

[0060] Preparation Example 4

[0061] The difference between this preparation example and preparation example 3 is that an equal amount of polyethylene glycol divinyl ether is used instead of polyethylene glycol monomethyl ether.

[0062] Preparation Example 5

[0063] The preparation of the antibacterial modified nano-titanium dioxide in this example includes the following steps:

[0064] Sa-2. Based on titanium dioxide, accurately weigh 20% titanium dioxide sol and silver nitrate at a molar ratio of 1:0.06. Add silver nitrate to the titanium dioxide sol. Accurately weigh ethylenediamide at a molar ratio of 1:1 and add it to the titanium dioxide sol. After thorough mixing, sonicate for more than 30 minutes to obtain the sol solution.

[0065] Sb-2: The sol solution was rotary evaporated at 80-85 degrees Celsius to constant weight to obtain a colloid;

[0066] Sc-2: The colloid was calcined at 500~550℃ for 1 hour, and then ground to a particle size of 50~100nm to obtain antibacterial modified nano titanium dioxide.

[0067] The following are embodiments of this application.

[0068] The method for preparing antistatic polyester fiber according to embodiments of this application includes the following steps:

[0069] S1. Select specific hydrophilic polyurethane prepolymer and antibacterial modified nano titanium dioxide.

[0070] S2. Add the ATO antistatic agent of the formula amount to the hydrophilic polyurethane prepolymer, mix and disperse thoroughly, then add the remaining raw materials of the formula amount to the hydrophilic polyurethane prepolymer, mix thoroughly, and obtain the premix.

[0071] S3. Add the premixed material to a twin-screw extruder, and after melt extrusion and granulation, obtain antistatic polyester masterbatch. The process parameters for extrusion granulation are as follows: the temperatures of the 6 temperature zones are 175℃, 180℃, 185℃, 190℃, 185℃, and 180℃ respectively.

[0072] S4. Antistatic polyester masterbatch is processed by hot melt spinning to obtain antistatic polyester fiber.

[0073] The fiber size in the embodiments and comparative examples of this application is a single filament diameter of 0.5 mm.

[0074] Example 1

[0075] The mass ratio of each raw material component of the antistatic polyester fiber in this embodiment includes: 100 parts of PET resin, 20 parts of hydrophilic polyurethane prepolymer, 4 parts of antibacterial modified nano titanium dioxide, 8 parts of maleic anhydride grafted polyethylene, 6 parts of carbon nanotubes, 4 parts of carbodiimide, and 1.6 parts of ATO antistatic agent (antimony doping amount 2.5%).

[0076] In this embodiment, the hydrophilic polyurethane prepolymer of Preparation Example 4 and the antibacterial modified nano-titanium dioxide of Preparation Example 5 were selected.

[0077] Example 2

[0078] The mass ratio of each raw material component of the antistatic polyester fiber in this embodiment includes: 100 parts PET resin, 30 parts hydrophilic polyurethane prepolymer, 8 parts antibacterial modified nano titanium dioxide, 14 parts maleic anhydride grafted polyethylene, 10 parts carbon nanotubes, 6 parts carbodiimide, and 4.8 parts ATO antistatic agent (antimony doping amount 2.5%).

[0079] In this embodiment, the hydrophilic polyurethane prepolymer of Preparation Example 4 and the antibacterial modified nano-titanium dioxide of Preparation Example 5 were selected.

[0080] Example 3

[0081] The mass ratio of each raw material component of the antistatic polyester fiber in this embodiment includes: 100 parts PET resin, 24 parts hydrophilic polyurethane prepolymer, 6 parts antibacterial modified nano titanium dioxide, 10 parts maleic anhydride grafted polyethylene, 8 parts carbon nanotubes, 4.8 parts carbodiimide, and 3.4 parts ATO antistatic agent (antimony doping amount 2.5%).

[0082] In this embodiment, the hydrophilic polyurethane prepolymer of Preparation Example 4 and the antibacterial modified nano-titanium dioxide of Preparation Example 5 were selected.

[0083] Example 4

[0084] The mass ratio of each raw material component of the antistatic polyester fiber in this embodiment includes: 100 parts of PET resin, 26 parts of hydrophilic polyurethane prepolymer, 6.5 parts of antibacterial modified nano titanium dioxide, 12 parts of polyvinylpyrrolidone copolymer, 8.6 parts of carbon nanotubes, 5.2 parts of carbodiimide, and 3.8 parts of ATO antistatic agent (antimony doping content 2.5%).

[0085] In this embodiment, the hydrophilic polyurethane prepolymer of Preparation Example 4 and the antibacterial modified nano-titanium dioxide of Preparation Example 5 were selected.

[0086] Example 5

[0087] The difference between this embodiment and Example 4 is that this embodiment uses the hydrophilic polyurethane prepolymer from Preparation Example 1.

[0088] Example 6

[0089] The difference between this embodiment and Example 4 is that this embodiment uses the hydrophilic polyurethane prepolymer from Preparation Example 2.

[0090] Example 7

[0091] The difference between this embodiment and Example 4 is that this embodiment selects the hydrophilic polyurethane prepolymer from Preparation Example 3.

[0092] Example 8

[0093] The difference between this embodiment and Embodiment 7 is that the antimony doping amount of the ATO antistatic agent in this embodiment is 3.5%.

[0094] Example 9

[0095] The difference between this embodiment and Embodiment 7 is that the antimony doping amount of the ATO antistatic agent in this embodiment is 3.8%.

[0096] Example 10

[0097] The difference between this embodiment and embodiment 7 is that the antimony doping amount of the ATO antistatic agent in this embodiment is 4.0%.

[0098] Comparative Example 1

[0099] This application uses Example 2 of the invention patent with publication number CN120719420A and invention titled "Antistatic Polyester Fiber and Preparation Method Thereof" as Comparative Example 1.

[0100] Comparative Example 2

[0101] The difference between this comparative example and Example 9 is that an equal amount of K1230 polyester polyurethane prepolymer produced by Jiangsu Qianmeite Polyurethane New Material Co., Ltd. was used to replace the hydrophilic polyurethane prepolymer.

[0102] Comparative Example 3

[0103] The difference between this comparative example and Example 9 is that carbon nanotubes were not added.

[0104] Comparative Example 4

[0105] The difference between this comparative example and Example 9 is that an equal amount of nano-titanium dioxide was used to replace the antibacterial modified nano-titanium dioxide.

[0106] The product performance of Examples 1-10 and Comparative Examples 1-4 was tested. The fibers of Examples 1-10 and Comparative Examples 1-4 were woven into plain weave fabrics with a sample size of 25cm×5cm. The strength, abrasion resistance and antibacterial properties of the samples were tested respectively. Then the resistivity of the fibers was tested.

[0107] Among them, the fracture strength was tested according to the method described in GB / T 3923.1-2013;

[0108] Abrasion resistance was tested according to the method described in GB / T 21196.1-2007;

[0109] The antibacterial activity was determined according to the agar plate diffusion method described in GB / T 20944.3-2008, which was used to detect the antibacterial rate of Staphylococcus aureus.

[0110] The resistivity was tested according to the method described in GB / T 14342-2015, and the fill factor was 0.23.

[0111] The results are shown in Table 1 below.

[0112]

[0113] As can be seen from the data in Table 1, the products of Examples 1-10 of this application show significantly improved strength and abrasion resistance compared to Comparative Example 1 of the prior art, with essentially the same antibacterial rate, while the resistivity is significantly lower than that of Comparative Example 1. This demonstrates that the antistatic polyester fiber of this application possesses excellent physical properties, with significantly superior strength and abrasion resistance compared to existing products, and its antibacterial properties are also relatively superior. Furthermore, thanks to the design of this application using a hydrophilic polyurethane crosslinked network to load the antistatic agent, the antistatic performance of this application is significantly better than that of existing products.

[0114] The data in Table 1, comparing the data from Examples 1-10, shows that the products of Examples 8-10 exhibit significantly better performance than those of Examples 1-7, while the products of Examples 5-7 exhibit significantly better performance than those of Examples 1-4. This demonstrates that the optimized raw material ratio significantly improves the various properties of the fiber material. Furthermore, the use of 401-70 MPA / X type hydrophilic IPDI curing agent and polyethylene glycol monomethyl ether to prepare the hydrophilic polyurethane prepolymer significantly reduces the resistivity, significantly improves antistatic properties, and also enhances strength and abrasion resistance. Therefore, the hydrophilic polyurethane prepolymer prepared using 401-70 MPA / X type hydrophilic IPDI curing agent and polyethylene glycol monomethyl ether designed in this application not only effectively enhances the physical properties of the fiber but also further improves its hygroscopicity, thereby effectively reducing resistivity and improving antistatic performance. In addition, in the system of this application, the antimony doping content of the selected ATO antistatic agent is preferably controlled at 3.5~4%. If it exceeds the above range, the conductivity of the material will decrease significantly, while the optimal antimony doping content is 3.8%.

[0115] By comparing the data from Example 9 and Comparative Examples 2-4 in Table 1, it can be seen that the use of hydrophilic polyurethane to construct a cross-linked network in this application can significantly improve the antistatic performance of the material in conjunction with the ATO antistatic agent. Using other non-hydrophilic polyurethanes, it is impossible to construct a hydrophilic conductive network within the material; relying solely on the properties of the antistatic agent itself has very limited effect on improving the material's antistatic performance. Furthermore, the addition of carbon nanotubes as a functional filler in this application can effectively improve the material's strength and wear resistance, and also act as a conductor, further enhancing the material's antistatic performance. The antibacterial modified nano-titanium dioxide in this application, using nano-silver in combination with nano-titanium dioxide to form a composite antibacterial agent, can combine with polyurethane-grafted eugenol bio-antibacterial agent and trace amounts of quaternary ammonium salt to form a composite antibacterial system, significantly improving antibacterial performance; relying solely on grafted eugenol has very limited antibacterial performance.

[0116] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An antistatic polyester fiber, characterized by, The mass ratio of each raw material component of the antistatic polyester fiber includes: 100 parts PET resin, 20-30 parts hydrophilic polyurethane prepolymer, 4-8 parts antibacterial modified nano titanium dioxide, 8-14 parts compatibilizer, 6-10 parts carbon nanotubes, 4-6 parts carbodiimide, and 1.6-4.8 parts ATO antistatic agent. The preparation of the hydrophilic polyurethane prepolymer includes the following steps: Sa-1, mix 401-70 MPA / X type hydrophilic IPDI curing agent, polyethylene glycol monomethyl ether and eugenol thoroughly at a mass ratio of 100:20~24:8~10 to obtain a premix; Sb-1. Add 8% of trimethylolpropane and 4% of triethylamine to the premix, then add 0.05% of dibutyltin dilaurate and 0.25% of quaternary ammonium salt to the premix. After thorough mixing, a reaction solution is obtained. Sc-1: The reaction solution was reacted at 24~28℃ for 4 hours under nitrogen protection, and then the temperature was raised to 60~65℃ for 0.5 hours. After cooling, a hydrophilic polyurethane prepolymer was obtained. The method for preparing the antistatic polyester fiber includes the following steps: S1. Preparation of hydrophilic polyurethane prepolymer and antibacterial modified nano-titanium dioxide; S2. Add the ATO antistatic agent of the formula amount to the hydrophilic polyurethane prepolymer, mix and disperse thoroughly, then add the remaining raw materials of the formula amount to the hydrophilic polyurethane prepolymer and mix thoroughly to obtain the premix. S3. Add the premixed material to a twin-screw extruder, and after melt extrusion and granulation, obtain antistatic polyester masterbatch; S4. Antistatic polyester masterbatch is processed by hot melt spinning to obtain antistatic polyester fiber.

2. The antistatic polyester fiber according to claim 1, characterized in that, The mass ratio of each raw material component of the antistatic polyester fiber includes: 100 parts PET resin, 24-26 parts hydrophilic polyurethane prepolymer, 6-6.5 parts antibacterial modified nano titanium dioxide, 10-12 parts compatibilizer, 8-8.6 parts carbon nanotubes, 4.8-5.2 parts carbodiimide, and 3.4-3.8 parts ATO antistatic agent.

3. The antistatic polyester fiber according to claim 1, characterized in that, The preparation of the antibacterial modified nano-titanium dioxide includes the following steps: Sa-2. Based on titanium dioxide, accurately weigh 20% titanium dioxide sol and silver nitrate at a molar ratio of 1:0.

06. Add silver nitrate to the titanium dioxide sol. Accurately weigh ethylenediamide at a molar ratio of 1:1 and add it to the titanium dioxide sol. After thorough mixing, sonicate for more than 30 minutes to obtain the sol solution. Sb-2: The sol solution was rotary evaporated at 80-85 degrees Celsius to constant weight to obtain a colloid; Sc-2: The colloid was calcined at 500~550℃ for 1 hour, and then ground to a particle size of 50~100nm to obtain antibacterial modified nano titanium dioxide.

4. The antistatic polyester fiber according to claim 1, characterized in that, The antimony doping amount in the ATO antistatic agent is 3.5-4%.

5. The antistatic polyester fiber according to claim 1, characterized in that, In step S3, the process parameters for extrusion granulation are as follows: the temperatures of the six temperature zones are 175℃, 180℃, 185℃, 190℃, 185℃, and 180℃ respectively.

6. The application of the antistatic polyester fiber according to any one of claims 1 to 5 in the field of automotive interior textile fabrics.

Images