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CN-122013365-A - Antibacterial antistatic regenerated polyester staple fiber and preparation method thereof

CN122013365ACN 122013365 ACN122013365 ACN 122013365ACN-122013365-A

Abstract

The invention relates to the technical field of regenerated fibers, in particular to an antibacterial antistatic regenerated polyester staple fiber and a preparation method thereof, and aims to solve the technical problems that impurities in regenerated polyester raw materials are more, functional auxiliary agents are easy to run off, antibacterial and antistatic functions are difficult to be compatible, and durability is poor. The preparation method comprises the steps of taking residual impurity ions in a crude monomer obtained by alcoholysis of waste polyester as a bridging agent, inducing antibacterial metal ions and graphene oxide to form a coordination complex structure, preparing a functional compound, dispersing the functional compound in ethylene glycol, carrying out in-situ polymerization with terephthalic acid to enable the functional compound to be connected with a polyester molecular chain through covalent bonds to obtain modified slices, and finally carrying out sheath-core composite spinning by taking the modified slices as a skin layer and common regenerated polyester as a core layer, and finally carrying out two-stage thermal traction and heat setting. The invention realizes molecular-level fixation and long-acting durability of the antibacterial and antistatic functions through double locking of chemical bonding and physical coating.

Inventors

  • Zhong Zhongjing

Assignees

  • 桐乡市佑通新材料有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The antibacterial antistatic regenerated polyester staple fiber is characterized by comprising a sheath-core composite structure, wherein the sheath-core composite structure comprises a sheath layer and a core layer, the sheath layer comprises polyethylene glycol terephthalate subjected to chemical grafting modification, graphene oxide-metal complex macromolecules are linked on a macromolecular chain of the sheath layer through covalent ester bonds, a multidentate coordination bridging structure is formed between ions of metal and oxygen-containing functional groups of graphene oxide in the complex through at least one divalent metal ion selected from calcium or magnesium, and the core layer is common regenerated polyester.
  2. 2. The antibacterial antistatic regenerated polyester staple fiber according to claim 1, wherein, The leather layer comprises, by weight, 4-6 parts of a functional compound, 40-50 parts of terephthalic acid and 0.03-0.05 part of ethylene glycol antimony, wherein the functional compound comprises, by weight, 40-50 parts of waste polyester textiles, 1-2 parts of an antibacterial metal precursor and 2-3 parts of graphene oxide.
  3. 3. The antibacterial antistatic regenerated polyester staple fiber according to claim 1, wherein, The antibacterial metal precursor is silver nitrate or zinc acetate.
  4. 4. A method for preparing the antibacterial antistatic regenerated polyester staple fiber according to any one of claims 1 to 3, which is characterized by comprising the following steps: S1, taking 40-50 parts by weight of waste terylene textile as a benchmark, adding 80-90 parts of ethylene glycol after crushing, conducting alcoholysis, transferring to a hydrothermal reaction kettle, adding 1-2 parts of antibacterial metal precursor and 2-3 parts of graphene oxide, stirring and reacting for 6 hours at 150 ℃, cooling and suction filtering after the reaction is finished, washing a filter cake with absolute ethyl alcohol, and drying to obtain a functional compound; S2, dispersing 4-6 parts of the functional compound in ethylene glycol by ultrasonic, wherein the solid content is 4%, the rotating speed is 15000rpm, treating for 30 minutes, adding 40-50 parts of terephthalic acid and 0.03-0.05 part of ethylene glycol antimony, then carrying out esterification and polycondensation reaction, discharging after the reaction is finished, and granulating to obtain an in-situ polymerization modified polyester slice; S3, taking the modified polyester chips obtained in the step S2 as a sheath raw material, taking regenerated polyester as a core raw material, respectively carrying out melt extrusion by a screw, and spinning by a sheath-core type composite spinning component with the sheath-core mass ratio of 3:7 to obtain sheath-core type nascent fibers; S4, cooling and solidifying the nascent fiber by circular blowing at 20 ℃ and with the humidity of 65%, performing two-stage hot drawing, then entering a stuffer box crimper, reheating and shaping, and finally cutting to obtain the short fiber.
  5. 5. The method for preparing the antibacterial antistatic regenerated polyester staple fiber according to claim 4, which is characterized in that, The alcoholysis in step S1 is specifically carried out at 180 ℃ for 6 hours.
  6. 6. The method for preparing the antibacterial antistatic regenerated polyester staple fiber according to claim 4, which is characterized in that, The drying in step S1 is specifically vacuum drying at 60 ℃ for 12 hours.
  7. 7. The method for preparing the antibacterial antistatic regenerated polyester staple fiber according to claim 4, which is characterized in that, The esterification reaction in the step S2 is specifically carried out for 2-3 hours at 230-240 ℃ under the protection of nitrogen, then the temperature is raised to 270-280 ℃, and the vacuum pumping is carried out until the pressure is less than 100Pa, and the polycondensation reaction is carried out for 3 hours.
  8. 8. The method for preparing the antibacterial antistatic regenerated polyester staple fiber according to claim 4, which is characterized in that, The spinning in the step S3 is specifically carried out at a spinning temperature of 275-285 ℃, a cooling air temperature of 22 ℃ and a winding speed of 1200m/min.
  9. 9. The method for preparing the antibacterial antistatic regenerated polyester staple fiber according to claim 4, which is characterized in that, The two-stage hot drawing in the step S4 is specifically a one-stage 90 ℃ hot water bath with a drawing multiple of 2.0 times, a two-stage 130 ℃ hot plate with a drawing multiple of 1.5 times and a total drawing multiple of 3.0 times.
  10. 10. The method for preparing the antibacterial antistatic regenerated polyester staple fiber according to claim 4, which is characterized in that, And (3) performing heat setting, namely performing relaxation heat setting for 10-15 minutes under the condition of 120-130 ℃ hot air.

Description

Antibacterial antistatic regenerated polyester staple fiber and preparation method thereof Technical Field The invention relates to the technical field of regenerated fibers, in particular to antibacterial antistatic regenerated polyester staple fibers and a preparation method thereof. Background With the wide application of polyester materials in the fields of packaging, spinning and the like, the stock of waste polyester products is continuously increased. The degradation period of polyester in natural environment is usually more than 50 years, which causes serious resource waste and solid waste pollution. The efficient recycling of the polyester solid waste is a necessary way for reducing the emission of greenhouse gases, relieving the shortage of resources and promoting the development of recycling economy. The polyester fiber is used as an important synthetic fiber, has the advantages of high strength, good wear resistance and the like, and is widely applied in the textile field. However, the conventional polyester fiber has the problems of poor hygroscopicity, easiness in generating static electricity, easiness in breeding bacteria and the like. Especially in the fields of sportswear, tools, medical textiles and the like, the demands of antistatic and antibacterial functions are urgent. In the prior art, the antibacterial and antistatic functions of the polyester fiber are mainly endowed by adding functional additives such as antibacterial metal ions, conductive carbon black, graphene and the like in the spinning process, and performing after-treatment on the surface of the fiber to coat a functional coating. For example, the prior patent CN118127663a discloses a method for preparing flame-retardant DTY polyester yarns by regenerating polyester fibers, but the attention of antistatic and antibacterial properties is insufficient. Despite the various technical solutions, the prior art still has the following core drawbacks: (1) The function durability is poor. Most of the prior art is simple physical blending or skin coating, and the functional factors and the polyester matrix lack chemical bonding, so that the functional factors are easy to run off in the using and washing processes, and the functional factors are just effective and fail after washing. (2) The impurities of the regenerated raw material interfere. The purity of the regenerated terylene raw material is far lower than that of the original slice, and impurities such as ash, metal ions and the like contained in the regenerated terylene raw material can not only lead to broken ends and blocked holes of spinning, but also preferentially adsorb or decompose functional auxiliary agents, so that the effective components actually added into the fiber are greatly discounted. (3) The function cooperativity is poor. The antibacterial agent and the antistatic agent are easy to react and lose efficacy mutually in the high-temperature spinning process, and double effects are difficult to achieve. (4) The structural design and the processing adaptability are not enough. In the processing of short fibers, the multilayer composite structure is extremely easy to damage in the processes of drafting, cutting and subsequent spinning and twisting, so that the functional layer is separated. Aiming at the problems, the invention provides a brand new technical scheme for realizing molecular-level fixation and long-acting durability of antibacterial and antistatic functions. Disclosure of Invention The invention aims to solve the technical problems of poor function durability, exertion of impurity interference functions of regenerated raw materials, difficulty in synergy of antibacterial and antistatic functions and the like of the traditional regenerated polyester fiber when the antibacterial and antistatic functions are given, and provides a preparation method of antibacterial and antistatic regenerated polyester staple fiber. A antibacterial antistatic regenerated polyester staple fiber and a preparation method thereof are provided, and the technical scheme is as follows: S1, taking 40-50 parts by weight of waste terylene textile as a benchmark, adding 80-90 parts of ethylene glycol after crushing, conducting alcoholysis, transferring to a hydrothermal reaction kettle, adding 1-2 parts of antibacterial metal precursor and 2-3 parts of graphene oxide, stirring and reacting for 6 hours at 150 ℃, cooling and suction filtering after the reaction is finished, washing a filter cake with absolute ethyl alcohol, and drying to obtain a functional compound; S2, dispersing 4-6 parts of the functional compound in ethylene glycol by ultrasonic, wherein the solid content is 4%, the rotating speed is 15000rpm, treating for 30 minutes, adding 40-50 parts of terephthalic acid and 0.03-0.05 part of ethylene glycol antimony, then carrying out esterification and polycondensation reaction, discharging after the reaction is finished, and granulating to obtain an in-situ polymerizati