Thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material and preparation method thereof

A technology of thermotropic liquid crystal and polyphenylene sulfide, applied in the field of polymer materials, to achieve the effect of increasing cell density, enhancing mechanical properties, and uniform cell diameter

Active Publication Date: 2021-07-09
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention proposes a thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material and its preparation method to solve or at least partially solve the technical problems existing in the prior art

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  • Thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material and preparation method thereof
  • Thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material and preparation method thereof

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preparation example Construction

[0036] The embodiment of the present application provides a method for preparing a thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material, comprising the following steps:

[0037] Preparation of polyphenylene sulfide / thermotropic liquid crystal polymer fiber composite sheet;

[0038] Put the polyphenylene sulfide / thermotropic liquid crystal polymer fiber composite sheet in the reactor, and then pass through the supercritical fluid foaming agent to make the pressure in the reactor be 3.3-25Mpa, and keep the temperature in the reactor at 0 ~280°C and maintain it for a certain period of time, raise the temperature to 200-330°C and keep it for 5-25 minutes, and then release the pressure in the reactor to normal pressure within 5-100s to prepare the thermotropic liquid crystal polymer fiber composite polyphenylene Sulfide foam;

[0039]Alternatively, the polyphenylene sulfide / thermotropic liquid crystal polymer fiber composite sheet is placed in th...

Embodiment 1

[0066] The embodiment of the present application provides a method for preparing a thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material, comprising the following steps:

[0067] S1. After mixing 100 parts of polyphenylene sulfide fibers and 2 parts of thermotropic liquid crystal polymer fibers, they are opened, and then beaten with water as a dispersion medium. The mass concentration of the beating is 1% to obtain a slurry; The average diameter of ether fibers is 15 μm, and the average diameter of thermotropic liquid crystal polymer fibers is 5 μm;

[0068] S2. Put the slurry in a fiber deflagging machine to decompose to obtain a polyphenylene sulfide fiber / thermotropic liquid crystal polymer fiber composite slurry, wherein the rotational speed during decompression is 2700 rad / min, and the decompression time is 20 minutes;

[0069] S3. Put the composite slurry on a cylinder paper machine for wet papermaking, wherein the netting concentration ...

Embodiment 2

[0075] The embodiment of the present application provides a method for preparing a thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material, comprising the following steps:

[0076] S1. Mix 100 parts of polyphenylene sulfide and 3 parts of thermotropic liquid crystal polymer, then knead in a twin-screw extruder, and form a blended melt after extrusion; wherein the extrusion of the twin-screw extruder Outlet temperature is 285~355℃;

[0077] S2. Transport the blended melt to spinning equipment, and spin to obtain polyphenylene sulfide / thermotropic liquid crystal polymer composite fibers; wherein the spinning temperature is 330°C, and the average diameter of the composite fibers is 30 μm, wherein the thermotropic Liquid crystal polymers form ultrafine fibers from 500nm to 1.5 microns in polyphenylene sulfide matrix fibers;

[0078] S3, placing the composite fiber on a web forming machine to obtain 140g / m 2 Polyphenylene sulfide / thermotropic liqui...

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Abstract

The invention provides a thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material and a preparation method thereof. The preparation method of the foam material comprises the following steps: preparing a polyphenylene sulfide/thermotropic liquid crystal polymer fiber composite sheet; and placing the composite sheet in a reaction kettle, then introducing a supercritical fluid foaming agent, maintaining certain pressure and temperature, and then subjecting the reaction kettle to rapid pressure relief so as to prepare the foam material; or placing the composite sheet in a reaction kettle, then introducing the supercritical fluid foaming agent, maintaining certain pressure and temperature, slowly releasing the pressure of the reaction kettle to normal pressure, and transferring the composite sheet into a high-temperature environment for foaming to obtain the foam material. According to the preparation method disclosed by the invention, the thermotropic liquid crystal polymer is used as a reinforcing fiber and a foaming nucleating agent of the composite foam material, so the mechanical properties and the foaming property of the composite foam can be improved; and by using the supercritical fluid as the foaming agent, a polymer is plasticized, so the polymer can be foamed under the condition that a temperature is lower than a melting point or a processing temperature.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a thermotropic liquid crystal polymer fiber composite polyphenylene sulfide foam material and a preparation method thereof. Background technique [0002] With the advancement of social needs and industrial development, the application performance requirements of polymer foam materials in some special fields are getting higher and higher, such as flame retardancy, high temperature resistance, corrosion resistance, and high mechanical properties. Polyphenylene sulfide is a widely used high-performance polymer material, which has excellent properties such as intrinsic flame retardancy, high temperature resistance, good mechanical properties, chemical corrosion resistance, and radiation resistance. It has huge application potential in the fields of national defense and military industry, aerospace, ships, rail transit and so on. [0003] However, the applicant found that the high pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L81/02C08L101/12C08J9/12
CPCC08J9/122C08J2203/06C08J2203/08C08J2381/02C08J2400/12
Inventor 贾迎宾王桦王罗新陈丽萍朱宗民杨诗文
Owner WUHAN TEXTILE UNIV
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