Preparation method of thermotropic liquid crystal polyarylester fiber

A technology of polyarylate fiber and thermotropic liquid crystal, which is applied in the field of preparation of thermotropic liquid crystal polyarylate, can solve the problems of complex method of thermotropic liquid crystal polyarylate, low tensile strength of polyarylate fiber and the like, and achieves reaction conditions Easy to control, simple to operate, and solve the effect of complicated preparation steps

Inactive Publication Date: 2015-03-04
HEILONGJIANG JUXIANG TECH DEV CO LTD
View PDF12 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing thermotropic liquid crystal polyarylate fiber in order to solve the problem that the existing method for preparing thermotropic liquid crystal polyarylate is complicated and the tensile strength of polyarylate fiber is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0011] Specific embodiment one: the preparation method of the thermotropic liquid crystal polyarylate fiber of this embodiment is implemented according to the following steps:

[0012] One, the p-hydroxybenzoic acid and 2-(4-hydroxyphenyl)-5-carboxybenzimidazole, acetic anhydride, 4-diethylaminopyridine and anti- The oxidizing agent is added to the Hastelloy polymerization kettle, kept at 120-160°C for 5-8 hours, then raised to 310°C, kept warm for 2 hours, then filled with nitrogen into the Hastelloy polymerization kettle, and discharged through the Hastelloy polymerization kettle. After crushing and drying, a prepolymer is obtained;

[0013] 2. Place the prepolymer obtained in step 1 under nitrogen protection conditions, and carry out solid-state polycondensation reaction in a rotary kiln at 190-205 ° C to obtain high molecular weight polymer powder;

[0014] 3. The high-molecular-weight polymer powder obtained in step 2 is mixed by a single-screw extruder at 320-350°C, exh...

specific Embodiment approach 2

[0018] Embodiment 2: This embodiment differs from Embodiment 1 in that the purity of the polymerized monomer p-hydroxybenzoic acid and 2-(4-hydroxyphenyl)-5-carboxybenzimidazole in step 1 is greater than 99.5%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the molar weight of acetic anhydride in step one is the polymerized monomer p-hydroxybenzoic acid and 2-(4-hydroxyphenyl)-5-carboxybenzo 2 to 2.5 times the total number of moles of hydroxyl groups in imidazole. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0020] The acetic anhydride described in this embodiment is used as an acylating agent.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a thermotropic liquid crystal polyarylester fiber, relates to a preparation method of thermotropic liquid crystal polyarylester, and aims to solve the problems that the existing method for preparing the thermotropic liquid crystal polyarylester is complex and the polyarylester fiber is low in tensile strength. The preparation method of the thermotropic liquid crystal polyarylester fiber comprises the following steps: step one, adding p-hydroxybenzonic acid, 2-(4-hydroxyphenyl)-5-carboxylbenzimidazole, acetic anhydride, 4-diethylaminopyridine and an antioxidant into a polymerization kettle for carrying out melt condensation polymerization to prepare a pre-polymer of thermotropic liquid crystal polyarylester; step two, putting the pre-polymer in a rotary kiln under the condition with nitrogen protection for carrying out solid phase polycondensation reaction to obtain high-molecular-weight polymer powder; step three, mixing the high-molecular-weight polymer powder, then cooling and drawing to prepare primary polyarylester fiber; and step four, carrying out heat treatment on the primary polyarylester fiber. The preparation method of the thermotropic liquid crystal polyarylester fiber is simple to operate; the tensile strength of the polyarylester fiber which is finally obtained can reach 4.0-4.5GPa.

Description

technical field [0001] The invention relates to a preparation method of thermotropic liquid crystal polyarylate. Background technique [0002] Thermotropic liquid crystal polyarylate has a series of advantages such as high strength and high modulus, flame resistance, low water absorption, good dimensional stability, etc., and is widely used in the fields of automobiles, electronics, military industry, and protection. Since Jackson reported the first thermotropic liquid crystal polyester in the 1970s, people have launched a large-scale research on thermotropic liquid crystal polyarylate. [0003] The preparation methods of thermotropic liquid crystal polyarylates are roughly divided into two categories, one is the acid chloride method, that is, adding dibasic acid chlorides, dihydric phenols and corresponding catalysts into an organic solvent for reaction to prepare thermotropic liquid crystal polyarylates. Zhang Hailiang used this method to prepare a thermal ester liquid cr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10D01D10/02C08G63/685
Inventor 王孝彬
Owner HEILONGJIANG JUXIANG TECH DEV CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap