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Preparation method of polyarylester based on 2-(4-hydroxyphenyl)-5-carboxypyridioimidazole

A technology of pyridoimidazole and hydroxyphenyl, which is applied in the field of preparation of polyarylate based on 2-(4-hydroxyphenyl)-5-carboxypyridoimidazole, can solve the cumbersome and complicated process of thermotropic liquid crystal polyarylate , Polyarylate low tensile strength and other problems, achieve the effect of convenient continuous production, easy control of reaction conditions, and solve the cumbersome preparation steps

Active Publication Date: 2019-03-29
宁波聚嘉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the complicated and complicated process of preparing thermotropic liquid crystal polyarylate, and the problem that the tensile strength of polyarylate is low, and provide a kind of based on 2-(4-hydroxyphenyl)-5- Process for the preparation of polyarylates of carboxypyridimidazoles

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

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

[0012] 1. P-hydroxybenzoic acid, 2-(4-hydroxyphenyl)-5-carboxypyridimidazole, acetic anhydride, 4-methylaminopyridine, and tin powder with a molar ratio of polymerized monomers of (0.3-3.0):1 Add it into the Hastelloy polymerization kettle, keep it at 120~165℃ for 7~10h, then raise the temperature to 325℃, keep it warm for 2 hours, fill the Hastelloy polymerization kettle with nitrogen, discharge it through the Hastelloy polymerization kettle, and crush it , obtain prepolymer after drying;

[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 185-210 ° C to obtain high molecular weight polymer powder;

[0014] 3. Mix the high-molecular-weight polymer powder obtained in step 2 through a single-screw ex...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the purity of p-hydroxybenzoic acid and 2-(4-hydroxyphenyl)-5-carboxypyridimidazole 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 that of the polymerized monomer p-hydroxybenzoic acid and 2-(4-hydroxyphenyl)-5-carboxypyrido 1.8 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.

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Abstract

The invention discloses a preparation method of polyarylester based on 2-(4-hydroxyphenyl)-5-carboxypyridioimidazole, relates to the preparation method of polyarylester based on 2-(4-hydroxyphenyl)-5-carboxypyridioimidazole, and solves the problems of complex method for preparation of thermotropic liquid crystal polyarylester and low tensile strength of polyarylester fibers. The preparation methodcomprises the steps: 1, adding p-hydroxybenzoic acid with 2-(4-hydroxyphenyl)-5-carboxypyridioimidazole, acetic anhydride, 4-methylaminopyridine and an antioxidant into a polymerization kettle, and carrying out melt condensation polymerization to obtain a prepolymer of thermotropic liquid crystal polyarylester; 2, placing the prepolymer under a nitrogen gas protection condition, and carrying outsolid-state condensation polymerization reaction in a rotary kiln, to obtain high-molecular-weight polymer powder; 3, mixing the high-molecular-weight polymer powder, then cooling, and drawing to obtain primary polyarylester; and 4, carrying out heat treatment of the primary polyarylester. The preparation method of the thermotropic liquid crystal polyarylester fibers is simple to operate, and thetensile strength of the ultimately obtained polyarylester fibers can reach 180-210 MPa.

Description

technical field [0001] The invention relates to a preparation method of polyarylate based on 2-(4-hydroxyphenyl)-5-carboxypyridimidazole. Background technique [0002] Thermotropic liquid crystal polyarylate (TLCP) has excellent UV shielding resistance, impact resistance, surface hardness and creep resistance. Polyarylate is a self-extinguishing plastic, non-combustible. In the case of no flame retardant, the sample with a thickness of 1.6mm can reach the level of UL94V-0. It has excellent properties and a wide range of applications that cannot be compared with conventional polymers, which has led many researchers to conduct large-scale research on thermotropic liquid crystal polyarylates. [0003] At present, only a few companies such as the United States and Japan have mastered the key technology for the preparation of liquid crystal polyarylate high-performance fibers. China has carried out research and development of TLCP for many years, and has also begun to explore i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685
CPCC08G63/685
Inventor 李楠蒲海建王丹郭继磊
Owner 宁波聚嘉新材料科技有限公司