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A semi-aromatic polyamide based on aromatic diamine and preparation method thereof

A technology of aromatic dibasic and aromatic dibasic acids, which is applied in the field of polymer synthesis, can solve problems such as poor melt fluidity and decreased crystallinity, and achieve high continuous use temperature, low water absorption, and good high-temperature rigidity Effect

Active Publication Date: 2022-02-08
四川斯派恩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of irregular structures, such as the introduction of meta aromatic rings or the introduction of branched chains in the aliphatic chain can increase the glass transition temperature, but it will bring about negative effects such as decreased crystallinity and poor melt fluidity.

Method used

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  • A semi-aromatic polyamide based on aromatic diamine and preparation method thereof
  • A semi-aromatic polyamide based on aromatic diamine and preparation method thereof
  • A semi-aromatic polyamide based on aromatic diamine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Add 2000g of succinic anhydride and 3000g of N-methyl-2-pyrrolidone into a reactor equipped with a stirrer, a thermometer, a condenser tube and a nitrogen inlet and outlet tube; under the protection of nitrogen, add 1080g of p-phenylenediamine, and stir the reaction at room temperature The reaction solution was obtained in 5 hours; the reaction solution was added to 0.10 mol / L hydrochloric acid to precipitate the product, which was filtered, washed, and dried in a vacuum oven at 80°C for 24 hours to obtain the monomer.

[0073]Add 1540g of the above-mentioned monomers, 830g of terephthalic acid, 1280g of hexamethylenediamine, 226g of caprolactam, 50g of phosphoric acid, 80g of stearic acid and 3500g of deionized water into the reactor, and raise the temperature to 95°C within 1 hour under the protection of nitrogen; Close the reaction kettle, raise the temperature to 240°C within 2 hours, and react for 4 hours; cool down and discharge, the solid is crushed and dried to a...

Embodiment 2

[0076] Add 228g of glutaric anhydride and 800g of 1,3-dimethyl-2-imidazolidinone into a reactor equipped with a stirrer, thermometer, condenser and nitrogen inlet and outlet tubes; under nitrogen protection, add 216g of 4,4 '-Diaminodiphenyl sulfide, stirred and reacted at room temperature for 4 hours; the reaction solution was added to water to precipitate the product, filtered, washed, and dried in a vacuum oven at 80°C for 24 hours to obtain the monomer.

[0077] 333g of the above monomers, 43g of 2,5-thiophenedicarboxylic acid, 68.5g of 4,4'-dicarboxydiphenyl sulfide, 139g of pentamethylenediamine, 2g of sodium hypophosphite, 5g of p-toluic acid and 200g of deionized water Put it into the reaction kettle, under the protection of nitrogen, raise the temperature to 100°C within 0.5h; close the reaction kettle, raise the temperature to 230°C within 1h, and react for 5h; cool down and discharge, the solid is crushed and dried until the water content is ≤0.3%. A semiaromatic po...

Embodiment 3

[0080] Add 1,000g of succinic anhydride and 2,500g of N,N-dimethylacetamide into a reactor equipped with a stirrer, a thermometer, a condenser tube, and nitrogen inlet and outlet tubes; under nitrogen protection, add 1,240g of 4,4'-diamino Diphenyl sulfone was reacted with stirring at room temperature for 6 hours; the reaction solution was added into water to precipitate the product, which was filtered, washed, and dried in a vacuum oven at 80°C for 24 hours to obtain the monomer.

[0081] 1344g of the above monomers, 522g of 4,4'-bis(4-carboxyphenylthio)diphenylsulfone, 585g of p-xylylenediamine, 201g of 11-aminoundecanoic acid, 10g of polyphosphoric acid, 5g of sodium triphosphate, 25g of sodium formate and 1100g of deionized water were added to the reaction kettle, and under the protection of nitrogen, the temperature was raised to 90°C within 1 hour; the reaction kettle was closed, and the temperature was raised to 260°C within 3 hours, and the reaction was carried out for ...

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Abstract

The invention relates to a semi-aromatic polyamide based on an aromatic diamine and a preparation method thereof, belonging to the technical field of polymer synthesis. The present invention provides a semi-aromatic polyamide based on aromatic diamine, the structural formula of the semi-aromatic polyamide based on aromatic diamine is as follows, wherein, n=10~200, 0<x +y+z≤1, x≠0. In the present invention, aromatic diamines and acid anhydrides are used as raw materials to synthesize monomers, and the obtained monomers are mixed with aromatic dibasic acids, aliphatic dibasic acids, diamines and comonomers, and under the action of catalyst and water, Polymerization produces a semi-aromatic polyamide prepolymer based on aromatic diamine, and the prepolymer is further polycondensed at high temperature to obtain a high molecular weight semi-aromatic polyamide resin based on aromatic diamine; the obtained resin has a glass transition temperature It has the advantages of high and high temperature rigidity, easy processing and high mechanical strength.

Description

technical field [0001] The invention relates to a semi-aromatic polyamide based on an aromatic diamine and a preparation method thereof, belonging to the technical field of polymer synthesis. Background technique [0002] Polyamide is a class of polymer materials with excellent performance. It was first produced by DuPont in the 1930s, and its trade name is nylon. Later, because of its wide application, nylon became the collective name of various polyamides. Due to the strong hydrogen bonding between amide bonds, polyamides have good heat resistance and mechanical properties. Polyamides are divided into aliphatic polyamides, aromatic polyamides and semi-aromatic polyamides according to the types of groups in the molecular chain. Among them, aliphatic polyamide is currently the most used polyamide material, but its melting point is generally low and its water absorption rate is high, which gradually cannot meet the requirements of material performance in modern industrial p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/36C08G69/42C08G69/40C08G69/26
CPCC08G69/36C08G69/42C08G69/40C08G69/26
Inventor 张美林杨杰龙盛如王孝军张刚
Owner 四川斯派恩新材料有限公司
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