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CN-122013440-A - Polymer PI fiber heat preservation cotton and preparation method thereof

CN122013440ACN 122013440 ACN122013440 ACN 122013440ACN-122013440-A

Abstract

The application discloses a high polymer PI fiber heat-insulating cotton and a preparation method thereof, wherein the heat-insulating cotton comprises an inner layer, an intermediate layer and an outer layer, the inner layer comprises PI fibers and polyvinyl alcohol fibers, the intermediate layer comprises PI fibers and sheath-core composite fibers, and the outer layer comprises PI fibers, aramid fibers and low-melting-point fibers; the preparation method of the modified PI fiber comprises the following steps of polymerizing pyromellitic dianhydride and 4,4' -diaminodiphenyl ether in N, N-dimethylacetamide under the protection of nitrogen to obtain a polyamic acid solution, adding phenylethynyl-terminated hyperbranched polysiloxane, fluorinated graphene oxide, a surfactant and a pore-forming agent into the polyamic acid solution, reacting to obtain a modified polyamic acid spinning solution, and carrying out dry spinning and thermoforming treatment on the modified polyamic acid spinning solution to obtain the modified PI fiber. The heat-insulating cotton obtained by the method has the characteristics of heat insulation, water washing resistance and comfort.

Inventors

  • Shi Chunshu
  • SHI JINZHUAN

Assignees

  • 嘉兴自然三禾新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (8)

  1. 1. A high molecular PI fiber heat preservation cotton is characterized by comprising an inner layer, an intermediate layer and an outer layer, The inner layer comprises PI fiber and polyvinyl alcohol fiber, the mass ratio of the PI fiber to the polyvinyl alcohol fiber is (25:75) - (20:80), The intermediate layer comprises PI fiber and sheath-core composite fiber, the mass ratio of the PI fiber to the sheath-core composite fiber is (70:30) - (80:20), The outer layer comprises PI fibers, aramid fibers and low-melting-point fibers, wherein the mass ratio of the PI fibers to the aramid fibers to the low-melting-point fibers is 50 (30-35) (15-20); The preparation method of the modified PI fiber comprises the following steps of polymerizing pyromellitic dianhydride and 4,4' -diaminodiphenyl ether in N, N-dimethylacetamide under the protection of nitrogen to obtain a polyamic acid solution, adding phenylethynyl-terminated hyperbranched polysiloxane, fluorinated graphene oxide, a surfactant and a pore-forming agent into the polyamic acid solution to react to obtain a modified polyamic acid spinning solution, and carrying out dry spinning and thermoforming treatment on the modified polyamic acid spinning solution to obtain the modified PI fiber.
  2. 2. The high-molecular PI fiber heat preservation cotton according to claim 1, wherein the surfactant is fatty alcohol polyoxyethylene ether.
  3. 3. The polymer PI fiber insulation cotton according to claim 1, wherein the pore-forming agent is 4,4' -oxybisbenzenesulfonyl hydrazide.
  4. 4. The polymer PI fiber insulation cotton according to claim 1, wherein said low melting point fiber is ES fiber.
  5. 5. The high-molecular PI fiber heat preservation cotton according to claim 1, wherein the core layer of the sheath-core composite fiber is polyethylene terephthalate and the skin layer is copolyamide.
  6. 6. The high-molecular PI fiber heat preservation cotton according to claim 5, wherein the mass ratio of copolyamide to polyethylene terephthalate is (2:8) - (3:7).
  7. 7. The high-molecular PI fiber heat preservation cotton according to claim 1, wherein the fineness of the PI fiber used for the inner layer is 1.0-1.5D, and the fineness of the PI fiber used for the outer layer is 3.0-5.0D.
  8. 8. A method for preparing the polymer PI fiber insulation cotton according to any one of claims 1 to 7, comprising the steps of: And respectively carrying out opening mixing and carding on the fiber raw materials of the inner layer, the middle layer and the outer layer to obtain the inner layer, the middle layer and the outer layer, laying and stacking the fiber raw materials according to the sequence of the inner layer, the middle layer and the outer layer, and carrying out hot rolling to obtain the heat-insulating cotton.

Description

Polymer PI fiber heat preservation cotton and preparation method thereof Technical Field The application relates to the technical field of heat-insulating cotton materials, in particular to high-molecular PI fiber heat-insulating cotton and a preparation method thereof. Background The thermal insulation performance and the safety reliability of the thermal insulation cotton serving as the clothing core filling material directly determine the quality and the application range of the end product. At present, common thermal insulation cotton materials mainly comprise polyester fibers, down, wool, cotton and other traditional natural or chemical fibers, and high-performance synthetic fibers which are gradually focused in recent years. Along with the development of material science and technology, a part of novel heat-insulating cotton starts to adopt a composite structure or an after-finishing process, and aims to improve the heat resistance, durability or light weight level of the heat-insulating cotton to a certain extent. Among them, polyimide (PI) fibers have been attempted to be applied to the field of heat insulation cotton due to their inherent characteristics of high temperature resistance, flame retardance, etc., and have been attempted to provide a solution that combines heat insulation and safety in a special environment. However, PI fiber has the defects of heat preservation performance, washing resistance and comfort, the heat conductivity of the PI fiber is relatively high, the fiber form and the aggregate structure are difficult to maintain stable bulking for a long time, so that static air is limited, the heat insulation effect is insufficient, especially, heat loss is obvious in a wet or pressed environment, fiber breakage, caking or integral structure collapse easily occurs after the PI fiber is washed for many times, the heat preservation performance is rapidly attenuated, the form maintenance and the service life of a product are influenced, defects exist in wearing or contact comfort, the hand feeling of the PI fiber is usually hard, the softness and the rebound resilience are insufficient, and the application experience of the PI fiber in close-fitting textiles is influenced. Disclosure of Invention In order to solve the problems of insufficient heat preservation and heat preservation performance, washing resistance and comfort of PI fibers, the high polymer PI fiber heat preservation cotton and the preparation method thereof are provided. The first object of the present invention is achieved by the following technical solutions: A high molecular PI fiber heat preservation cotton comprises an inner layer, an intermediate layer and an outer layer, The inner layer comprises PI fiber and polyvinyl alcohol fiber, the mass ratio of the PI fiber to the polyvinyl alcohol fiber is (25:75) - (20:80), The middle layer comprises PI fiber and sheath-core composite fiber, the mass ratio of the PI fiber to the sheath-core composite fiber is (70:30) - (80:20), The outer layer comprises PI fiber, aramid fiber and low-melting-point fiber, wherein the mass ratio of the PI fiber to the aramid fiber to the low-melting-point fiber is 50 (30-35) (15-20); the preparation method of the modified PI fiber comprises the following steps of polymerizing pyromellitic dianhydride and 4,4' -diaminodiphenyl ether in N, N-dimethylacetamide under the protection of nitrogen to obtain a polyamic acid solution, adding phenylethynyl-terminated hyperbranched polysiloxane, fluorinated graphene oxide, a surfactant and a pore-forming agent into the polyamic acid solution, reacting to obtain a modified polyamic acid spinning solution, and carrying out dry spinning and thermoforming treatment on the modified polyamic acid spinning solution to obtain the modified PI fiber. By adopting the technical scheme, the PI fiber is used as polyimide material, has intrinsic low heat conductivity, can effectively block heat conduction, and has good rebound resilience and thermal stability given by a rigid chain segment of a molecular structure; The skin layer of the skin-core composite fiber can be fused to bond surrounding fibers after being heated to form a three-dimensional network structure, thereby fixing the positions among the fibers and preventing the thickness of the heat preservation layer from being reduced due to the displacement of the fibers in use, so that the middle layer can improve the lasting stability of the structure while ensuring the high heat preservation performance; The outer layer is composed of PI fibers, aramid fibers and low-melting-point fibers, the PI fibers provide heat preservation performance, the high strength, the high modulus and the heat resistance of the aramid fibers endow the outer layer with excellent stretching resistance, the low-melting-point fibers are fused and bonded under the action of heat, and a fiber network is solidified to improve the integral structure integration and the washing resistance