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CN-120905796-B - Wear-resistant and high-temperature-resistant polyester fiber and preparation method thereof

CN120905796BCN 120905796 BCN120905796 BCN 120905796BCN-120905796-B

Abstract

The invention discloses wear-resistant and high-temperature-resistant polyester fiber and a preparation method thereof, which belong to the technical field of polyester processing and are used for solving the technical problem that the wear resistance and the high-temperature resistance of the polyester fiber in the prior art are to be further improved; according to the invention, epoxy groups are modified on carboxylated carbon nanotubes through free radical polymerization reaction to obtain modified filler, the modified filler, an auxiliary additive and modified PET are subjected to melt spinning together to obtain a polyester fiber precursor, a modified antibacterial agent is prepared through a coprecipitation method, antibacterial liquid is further prepared, and the polyester fiber precursor is immersed in the antibacterial liquid to obtain the polyester fiber, so that the wear resistance and high temperature resistance of the polyester fiber are improved, and the antibacterial property of the polyester fiber is also improved.

Inventors

  • LI ZHENDONG
  • You Yefei
  • WANG QIUJU
  • LIU SHENGLI

Assignees

  • 苏州市日昇织造有限公司

Dates

Publication Date
20260508
Application Date
20250723

Claims (6)

  1. 1. The preparation method of the wear-resistant and high-temperature-resistant polyester fiber is characterized by comprising the following steps of: S1, placing terephthalic acid, ethylene glycol, 1, 4-butylene glycol and a catalyst into a reaction kettle protected by nitrogen atmosphere, stirring, heating to 250-260 ℃, and reacting for 2-3 hours under heat preservation to obtain a prepolymer; s2, placing the prepolymer into a reaction kettle protected by nitrogen atmosphere, stirring, vacuumizing, adding trimethyl phosphate, heating to 280-290 ℃, reacting for 4-6 hours under heat preservation, and performing post-treatment to obtain modified PET; s3, adding the modified PET, the modified filler and the auxiliary additive into a double-screw extruder, and carrying out melt extrusion and spinning to obtain a polyester fiber precursor; S4, dipping the polyester fiber precursor into an antibacterial liquid, and performing post-treatment to obtain polyester fibers; in the step S3, the modified filler is prepared by the following steps: a1, placing styrene, ethyl acetate, azodiisobutyronitrile and glycidyl methacrylate into a reaction kettle, stirring, heating the reaction kettle to 65-75 ℃, adding maleic anhydride, reacting for 1-2h under heat preservation, and performing post treatment to obtain an intermediate I; a2, adding the carboxylated carbon nanotubes into a ball mill for ball milling to obtain activated carbon nanotubes; A2, placing the activated carbon nanotube and acetone in a reaction kettle, stirring for 20-30min, adding the intermediate I, heating to 45-55 ℃, carrying out heat preservation reaction for 4-6h, and carrying out post-treatment to obtain modified filler; in step S4, the preparation method of the antibacterial liquid includes: b1, placing beta-cyclodextrin, deionized water and ethanol into a reaction kettle for stirring, heating the reaction kettle to 55-65 ℃, reacting for 15-30min at a constant temperature, slowly adding tea polyphenol, reacting for 1-2h in a dark place, cooling to 0-5 ℃ and reacting for 10-12h in a dark place, and performing post treatment to obtain the modified antibacterial agent; and B2, placing the modified antibacterial agent, gamma-mercaptopropyl triethoxysilane, ethanol and deionized water into a reaction kettle, stirring, adding saturated ammonia water, heating the reaction kettle to 45-55 ℃, carrying out heat preservation reaction for 1-2h, and carrying out post treatment to obtain the antibacterial liquid.
  2. 2. The method for preparing the wear-resistant and high-temperature-resistant polyester fiber according to claim 1, wherein in the step S1, the weight ratio of terephthalic acid to ethylene glycol to 1, 4-butylene glycol to catalyst is 6-8:2-4:1-2:0.5-1, the catalyst is antimonous oxide, in the step S2, the weight ratio of prepolymer to trimethyl phosphate is 8-10:0.2-0.4, in the step S3, the weight ratio of modified PET to modified filler to auxiliary additive is 60-80:10-15:5-10, the auxiliary additive consists of antioxidant, lubricant, antistatic agent and ultraviolet absorber according to the mass ratio of 1:2:1:3, and in the step S4, the impregnation ratio is 1:30-35.
  3. 3. The method for preparing the wear-resistant and high-temperature-resistant polyester fiber according to claim 1, wherein in the step A1, the dosage ratio of styrene, ethyl acetate, azodiisobutyronitrile, glycidyl methacrylate and maleic anhydride is 4-6g, 80-100mL, 0.5-1g, 2-4g, 1-2g, and in the step A3, the dosage ratio of the activated carbon nanotube, acetone and the intermediate I is 1-2g, 50-100mL, 5-7g.
  4. 4. The preparation method of the wear-resistant and high-temperature-resistant polyester fiber according to claim 1, wherein the preparation method of the activated carbon nanotube is characterized in that carboxylated carbon nanotubes are added into a planetary ball mill, stainless steel grinding balls with the thickness of 5-10mm are added, the ball-to-material ratio is 10:1, the rotating speed is set to 400-500rpm, ball milling is carried out for 1-2 hours, and the activated carbon nanotube is obtained through a 300-400-mesh sieve.
  5. 5. The preparation method of the wear-resistant and high-temperature-resistant polyester fiber according to claim 1, wherein in the step B1, the dosage ratio of the beta-cyclodextrin to the deionized water to the ethanol to the tea polyphenol is 2-4g to 20-30mL to 15-20mL to 2-4g, and in the step B2, the dosage ratio of the modified antibacterial agent to the gamma-mercaptopropyl triethoxysilane to the ethanol to the deionized water to the saturated ammonia water is 2-4g to 0.5-1g to 50-80mL to 5-10mL to 1-2mL.
  6. 6. The wear-resistant and high-temperature-resistant polyester fiber, which is characterized in that the wear-resistant and high-temperature-resistant polyester fiber is prepared by adopting the preparation method of the wear-resistant and high-temperature-resistant polyester fiber according to any one of claims 1-5.

Description

Wear-resistant and high-temperature-resistant polyester fiber and preparation method thereof Technical Field The invention relates to the technical field of polyester processing, in particular to wear-resistant and high-temperature-resistant polyester fibers and a preparation method thereof. Background Polyester fibers (polyethylene terephthalate fibers, PET) are widely used in the fields of clothing, industrial cloth, geotechnical materials, high-performance composite materials and the like due to excellent mechanical properties, chemical corrosion resistance and molding processability. With the improvement of the material performance requirements in the application field, particularly the use requirements in severe environments such as high temperature and high abrasion, the wear resistance and the thermal stability of the traditional polyester fiber become important factors limiting the further expansion of the traditional polyester fiber, and in order to improve the wear resistance and the high temperature resistance of the polyester fiber, researchers have developed various modification means such as blending enhancement, nano filler filling, hot stretching orientation, surface coating treatment and the like, and the methods have the advantages of mature process, controllable cost, easiness in large-scale application and the like, and become important means for improving the comprehensive performance of the polyester fiber at present. In the prior art, although the modification method improves the wear resistance and heat resistance of the polyester fiber to a certain extent, a plurality of defects still exist that firstly, nanoparticles are easy to agglomerate in a filler blending method, so that dispersion is uneven, further the continuity and mechanical stability of the fiber are affected, and secondly, the surface coating can improve the wear resistance in a short period, but has limited binding force with a substrate, is easy to fall off in a friction or washing process, reduces the durability, and in addition, the added reinforcing filler has poor interfacial compatibility with a PET substrate and weak interfacial binding force. In view of the technical drawbacks of this aspect, a solution is now proposed. Disclosure of Invention The invention aims to provide wear-resistant and high-temperature-resistant polyester fiber and a preparation method thereof, which are used for solving the technical problems that the wear resistance and the high-temperature resistance of the polyester fiber in the prior art are to be further improved. The invention aims at realizing the following technical scheme that the preparation method of the wear-resistant and high-temperature-resistant polyester fiber comprises the following steps of: S1, placing terephthalic acid, ethylene glycol, 1, 4-butylene glycol and a catalyst into a reaction kettle protected by nitrogen atmosphere, stirring, heating to 250-260 ℃, and reacting for 2-3 hours under heat preservation to obtain a prepolymer; s2, placing the prepolymer into a reaction kettle protected by nitrogen atmosphere, stirring, vacuumizing, adding trimethyl phosphate, heating to 280-290 ℃, reacting for 4-6 hours under heat preservation, and performing post-treatment to obtain modified PET; The preparation reaction formula of the modified PET is as follows: the preparation reaction principle of the modified PET is as follows: In the reaction process, under the action of high temperature and a catalyst, the phthalic acid, the ethylene glycol and the 1, 4-butylene glycol are subjected to esterification reaction, water is discharged, partial polycondensation is performed to generate linear prepolymer, trimethyl phosphate is added as a stabilizer, the temperature is continuously increased, the vacuum pumping is performed, the polycondensation reaction is promoted to the right, and the molecular weight is increased to obtain the modified PET. S3, adding the modified PET, the modified filler and the auxiliary additive into a double-screw extruder, and carrying out melt extrusion and spinning to obtain a polyester fiber precursor; the preparation reaction principle of the polyester fiber is as follows: In the reaction process, under the action of high temperature, the hydroxyl of the modified PET and the epoxy functional group in the modified filler are subjected to ring-opening reaction, covalent bonding and melt spinning to obtain the polyester fiber. S4, dipping the polyester fiber precursor into the antibacterial liquid, and performing post-treatment to obtain the polyester fiber. The preparation reaction principle of the polyester fiber is as follows: in the reaction process, under the irradiation of an ultraviolet lamp, phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide is cracked into free radicals, and then the mercapto-alkene clicking reaction is caused between the polyester fiber precursor and alkene unsaturated double bonds in the antibacterial liquid, so as to ob