A polyamide copolymer and a method for preparing the same

By introducing polyamide copolymers with semi-aromatic and aliphatic segmental structures and using water as a cyclization inhibitor, the problem that the melting points of PA4 and PA5 are close to the 5% weight loss temperature was solved, resulting in polyamide copolymers with high thermal stability and a wide melt processing window, thus expanding their application range.

CN121699140BActive Publication Date: 2026-06-23DONGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGHUA UNIV
Filing Date
2026-02-24
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The melting points of existing polyamides PA4 and PA5 are close to the 5% weight loss temperature, resulting in a narrow melt processing window and limiting their industrial application.

Method used

Polyamide copolymers with semi-aromatic, aliphatic, and AB segment structures are used in melt prepolymerization and solid-state polymerization with aminobutyric acid and aminovaleric acid as comonomers and water as a cyclization inhibitor to inhibit the formation of terminal lactam groups and improve polymerization activity and molecular weight.

Benefits of technology

It significantly improves the thermal stability and melt processing properties of polyamide copolymers, broadens the melt processing window, and is suitable for the fields of fibers, films and plastic products.

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Abstract

This invention belongs to the field of polyamide synthesis technology and discloses a polyamide copolymer and its preparation method. The molecular structure of the polyamide copolymer is or , where X refers to or ; R1, R2, R3 and R4 respectively refer to -(CH2). p -、-(CH2) a -、-(CH2) b - and - (CH2) c -; a ranges from 2 to 12; b ranges from 0 to 12; c ranges from 3 to 11; p is 3 or 4. The preparation method is as follows: water, polymerizable monomers, and copolymer components are added to a reactor, followed by prepolymerization to obtain a prepolymer. Then, water-soluble oligomers and unreacted components are removed, and solid-state polymerization is performed to obtain a polyamide copolymer. This invention significantly improves the yield, thermal stability, and melt processing properties of the obtained polyamide copolymer.
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Citation Information

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