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Polyamide, and preparation method and application thereof

A polyamide and diamine technology, applied in the polymer field, can solve problems such as unfavorable polyamide processing and gelation, and achieve the effects of low triamine content, low polyamide gel content and high service temperature

Active Publication Date: 2014-02-12
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that in the polymerization process of nylon, triamine substances containing secondary amino structures that are prone to side reactions occur, and this structure is easy to further react with carboxylic acids in the subsequent polymerization process to obtain a branched structure, and the further development of the branched structure will be It will form cross-links and cause gelation during polyamide polymerization, which is not conducive to the further processing of polyamide

Method used

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  • Polyamide, and preparation method and application thereof
  • Polyamide, and preparation method and application thereof

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preparation example Construction

[0024] A kind of preparation method of polyamide, comprises the following steps:

[0025] Feeding: Add dibasic acid monomer, diamine monomer, deionized water, optional nylon salt and other reaction aids into the reaction kettle, wherein the oxygen content of the deionized water is less than 0.05-0.1mg / L;

[0026] fill with protective gas;

[0027] Prepolymerization: Heating the reactor to make the mixture in the reactor undergo prepolymerization.

[0028] Among them, 35-50 mole parts of dibasic acid monomers, 35-50 mole parts of diamine monomers, wherein, the preferred range of the optional nylon salt is 0-30 mole parts, and the deionized water is The total amount of the reactant and water is 10-40wt%, preferably 20-30wt%.

[0029] The dibasic acid monomers include terephthalic acid and optionally oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, 2-methylsuberic acid, acid, azelaic acid, sebacic acid, undecanedioic acid, dod...

Embodiment 1

[0047] In the autoclave equipped with magnetic coupling stirring, condenser, gas phase port, feeding port, and pressure explosion-proof port, add the reaction raw materials according to the ratio in the table, and add deionized water. The oxygen content of the deionized water has been tested and its content is 0.01 mg / L, evacuated and filled with high-purity nitrogen as a protective gas, heated to 220°C within 2 hours under stirring, stirred the reaction mixture at 220°C for 1 hour, and then raised the temperature of the reactant to 230°C under stirring ℃. The reaction was continued at a constant temperature of 230°C and a constant pressure of 2.2MPa for 2 hours, and the pressure was kept constant by removing the formed water. After the reaction was completed, the material was discharged, and the prepolymer was vacuum-dried at 80°C for 24 hours to obtain the prepolymer. Polymerization product, the prepolymerization product is subjected to solid-phase viscosity increasing at 25...

Embodiment 2

[0049] In the autoclave equipped with magnetic coupling stirring, condenser, gas phase port, feeding port, and pressure explosion-proof port, add the reaction raw materials according to the ratio in the table, and add deionized water. The oxygen content of the deionized water has been tested and its content is 0.02 mg / L, evacuated and filled with high-purity nitrogen as a protective gas, heated to 220°C within 2 hours under stirring, stirred the reaction mixture at 220°C for 1 hour, and then raised the temperature of the reactant to 230°C under stirring ℃. The reaction was continued at a constant temperature of 230°C and a constant pressure of 2.2MPa for 2 hours, and the pressure was kept constant by removing the formed water. After the reaction was completed, the material was discharged, and the prepolymer was vacuum-dried at 80°C for 24 hours to obtain the prepolymer. Polymerization product, the prepolymerization product is subjected to solid-phase viscosity increasing at 25...

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Abstract

The invention relates to a polyamide, and a preparation method and an application thereof. The preparation method of the polyamide comprises the following steps: 1, charging: adding a dicarboxylic acid monomer, a diamine monomer, deionized water, an optional nylon salt and other reaction assistants to a reaction vessel, wherein the oxygen content of deionized water is less than 0.05-0.1mg / L; 2, filling with a protection gas; and 3, pre-polymerization: heating the reaction vessel to pre-polymerize a mixture in the reaction vessel. The gel content of polyamide polymerized through the preparation is lower than that of polyamide polymerized through the prior art because of the low triamine content of a pre-polymerized product, and polyamide prepared in the invention has a high use temperature and a good hot-working performance.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a polyamide, a preparation method and an application thereof. [0002] Background technique [0003] Polyamide is widely used because of its good comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance and self-lubrication, low coefficient of friction, certain flame retardancy, and easy processing. It is suitable for filling and modifying with glass fiber and other fillers to improve performance and expand application range. In recent years, semi-aromatic polyamides have been focused on development due to their better heat resistance and mechanical properties. Studies have shown that in the polymerization process of nylon, triamine substances containing secondary amino structures that are prone to side reactions occur, and this structure is easy to further react with carboxylic acids in the subsequent polymerization process to obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28C08L77/06
Inventor 张传辉曹民蔡彤旻夏世勇肖中鹏曾祥斌
Owner KINGFA SCI & TECH CO LTD
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