A kind of preparation method of polyarylate based on 2-(3-hydroxy-4-methoxyphenyl)-6-carboxypyridoimidazole

A technology of methoxyphenyl and pyridimidazole, which is applied in the field of preparation of polyarylate based on 2-(3-hydroxy-4-methoxyphenyl)-6-carboxypyridimidazole, can solve liquid crystal Unsatisfactory mechanical properties of polyarylate, complex production steps and other problems, to achieve the effect of convenient continuous production, easy control of reaction conditions, and simple operation

Active Publication Date: 2021-04-06
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 provide a method based on 2-(3-hydroxyl-4-methoxyphenyl)-6-carboxypyridimidazole in order to solve problems such as unsatisfactory mechanical properties and complicated manufacturing steps of liquid crystal polyarylates. The preparation method of polyarylate

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. The molar ratio of polymerized monomers is (0.5~2.9): 1 p-hydroxybenzoic acid and 2-(3-hydroxyl-4-methoxyphenyl)-6-carboxypyridimidazole, acetic anhydride and 2- Add butylaminopyridine and elemental tin into the titanium alloy polymerization kettle, keep it at 125-165°C for 2-7 hours, then raise the temperature to 325°C, keep it warm for 3 hours, fill the titanium alloy polymerization kettle with nitrogen, pass through the titanium alloy polymerization kettle Discharge, pulverize and dry to obtain the prepolymer;

[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 215-225 ° C to obtain high molecular weight polymer powder;

[0014] 3. Mix the high-molecular-weight polymer powder obtained i...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the purity of p-hydroxybenzoic acid and 2-(3-hydroxyl-4-methoxyphenyl)-6-carboxypyridimidazole in step one is greater than 99.3 %. 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 polymerized monomer p-hydroxybenzoic acid and 2-(3-hydroxyl-4-methoxyphenyl) -0.8 to 2.5 times the total moles of hydroxyl groups in 6-carboxypyridoimidazole. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

A preparation method of polyarylates based on 2-(3-hydroxy-4-methoxyphenyl)-6-carboxypyridoimidazole, the present invention relates to a preparation method based on 2-(3-hydroxy-4-methoxyphenyl) The invention discloses a preparation method of a polyarylate of phenyl)-6-carboxypyrimidazole, in order to solve the problems of unsatisfactory mechanical properties of liquid crystal polyarylate and complicated preparation steps. Preparation method: 1. Add p-hydroxybenzoic acid and 2-(3-hydroxy-4-methoxyphenyl)-6-carboxypyridoimidazole, acetic anhydride and 2-butylaminopyridine and antioxidant into the polymerization kettle , the prepolymer of thermotropic liquid crystal polyarylate is prepared by melt polycondensation; 2. The prepolymer is placed under nitrogen protection in a rotary kiln for solid-phase polycondensation to obtain high molecular weight polymer powder; 3. High molecular weight polymer powder After kneading, cooling, and drawing to prepare nascent polyarylate; 4. Heat treatment of the nascent polyarylate. The preparation method of the thermotropic liquid crystal polyarylate of the present invention is simple to operate, and the tensile strength of the finally obtained polyarylate can reach 90-150 MPa.

Description

technical field [0001] The invention relates to a preparation method of polyarylate based on 2-(3-hydroxyl-4-methoxyphenyl)-6-carboxypyridoimidazole. Background technique [0002] TLCP has excellent performance and a wide range of applications that cannot be compared with conventional polymers, and is widely used in aerospace, electronic information, medical and health fields, and energy fields. Thermotropic liquid crystal polyarylate is a new type of high-performance special engineering plastic developed in the early 1980s. It belongs to fully aromatic polyester and is a new type of polymer material. It will generally become liquid crystal under certain heating conditions. form, hence the name. These materials have excellent heat resistance and formability, and have a rigid and unyielding polymer structure, so they exhibit unique properties not found in other thermoplastics. However, many technical problems have been encountered in the industrialization of TLCP, such as t...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08G63/685C08G63/78C09K19/38
CPCC08G63/6852C08G63/78C09K19/3809
Inventor王阳王卉
Owner宁波聚嘉新材料科技有限公司