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A kind of preparation method based on the polyarylate of 2-(3-carboxyphenyl)-6-hydroxypyridimidazole

A technology of hydroxypyridimidazole and carboxyphenyl, which is applied in the field of preparation of polyarylate based on 2-(3-carboxyphenyl)-6-hydroxypyrimidazole, can solve the problem that the preparation of liquid crystal polyarylate is difficult and difficult. Unsatisfactory mechanical properties and other problems, to achieve the effect of convenient continuous production, easy control of reaction conditions, and simple operation

Active Publication Date: 2021-10-12
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 preparation of polyarylate based on 2-(3-carboxyphenyl)-6-hydroxypyridimidazole in order to solve the problems of difficult preparation of liquid crystal polyarylate and unsatisfactory mechanical properties. method

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 polymerized monomer molar ratio is (0.4~3.5):1 p-hydroxybenzoic acid and 2-(3-carboxyphenyl)-6-hydroxypyridimidazole, acetic anhydride and 4-propylaminopyridine and chlorination Add tin into the Hastelloy polymerizer, keep it at 110-155°C for 5-9h, then raise the temperature to 315°C, keep it warm for 2.5h, fill the Hastelloy polymerizer with nitrogen, and discharge it through the Hastelloy polymerizer , to obtain a prepolymer after crushing and 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 195-220 ° 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 extruder at 300-345°C. Af...

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-(3-carboxyphenyl)-6-hydroxypyridimidazole 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 polymerized monomer p-hydroxybenzoic acid and 2-(3-carboxyphenyl)-6-hydroxypyrido 1.5 to 3.0 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

A kind of preparation method based on the polyarylate of 2-(3-carboxyphenyl)-6-hydroxypyridimidazole, the present invention relates to a kind of polyarylate based on 2-(3-carboxyphenyl)-6-hydroxypyridimidazole The invention discloses a method for preparing polyarylate, which aims to solve the problems of difficult preparation of liquid crystal polyarylate and unsatisfactory mechanical properties. Preparation method: 1. Add p-hydroxybenzoic acid and 2-(3-carboxyphenyl)-6-hydroxypyridimidazole, acetic anhydride, 4-propylaminopyridine and an antioxidant into a polymerization kettle to prepare a thermotropic compound by melt polycondensation The prepolymer of liquid crystal polyarylate; 2. The prepolymer is placed under the condition of nitrogen protection to carry out solid-state polycondensation reaction in the rotary kiln to obtain high molecular weight polymer powder; 3. The high molecular weight polymer powder is cooled after mixing and pulled Stretch to prepare nascent polyarylate; 4. Carry out heat treatment to nascent polyarylate. The preparation method of the thermotropic liquid crystal polyarylate fiber of the present invention is simple to operate, and the tensile strength of the finally obtained polyarylate fiber can reach 170-215 MPa.

Description

technical field [0001] The invention relates to a preparation method of polyarylate based on 2-(3-carboxyphenyl)-6-hydroxypyridimidazole. Background technique [0002] 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. Polyarylate has excellent creep resistance, impact resistance, strain recovery, abrasion resistance, and high mechanical strength and rigidity. Polyarylates exhibit high tensile strength over a wide temperature range. In addition, it has excellent UV shielding resistance, impact resistance, surface hardness and creep resistance. Polyarylate is a non-crystalline polymer compound, which can be molded by thermoplastic methods, but has poor melt fluidity. Polyarylate is acid-resistant and oil-resistant, but the performance of alkali resistance, stress crack resistance, aromatic hydrocarbon and ketone resistance is not ideal. [0003] TLCP has att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685C08G63/87C08G63/80C08K3/16C09K19/38
CPCC08G63/6852C08G63/80C08G63/87C08K3/16C09K19/3809
Inventor 王阳王卉王丹蒲海建李楠郭继磊
Owner 宁波聚嘉新材料科技有限公司