High temperature resistant polymethacrylimide foam and method of making and use thereof

By introducing maleimide monomers and polyisocyanates into PMI foam materials to form a cross-linked network of Si-O-Si bonds, the problem of mechanical property degradation of PMI foam materials at high temperatures is solved, achieving high strength and dimensional stability, making it suitable for aerospace structural core materials.

CN122277795APending Publication Date: 2026-06-26HUNAN ZHAOHENG MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN ZHAOHENG MATERIAL TECH CO LTD
Filing Date
2026-05-27
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing polymethacrylimide (PMI) foam materials exhibit a sharp decline in mechanical properties at high temperatures, making it impossible to guarantee structural dimensional stability and service reliability.

Method used

Maleimide monomers are introduced into PMI foam materials, and the rigidity and high-temperature stability of the main chain are enhanced through the cross-linking reaction of carboxyl groups and polyisocyanates. A heat-resistant cross-linking network of Si-O-Si bonds is formed by using isocyanate-terminated polysiloxane cross-linking agents.

Benefits of technology

It improves the mechanical strength and the rate of mechanical property degradation at high temperatures of PMI foam material, maintains structural dimensional stability, and is suitable for use as a structural core material in the aerospace field.

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Abstract

This application belongs to the technical field of high-temperature resistant foam materials, and specifically relates to a high-temperature resistant polymethacrylamide (PMI) foam material, its preparation method, and its applications. Addressing the deficiency of existing PMI foam materials where mechanical properties rapidly degrade at high temperatures, this application introduces maleimide monomers into the PMI foam material to improve the rigidity of the molecular chain segments. Then, through a crosslinking reaction between carboxyl groups and polyisocyanates, a high-temperature resistant PMI foam material is obtained. The PMI foam material exhibits excellent mechanical strength and a low rate of mechanical property degradation at high temperatures, enabling it to withstand loads and maintain structural dimensional stability under high-temperature conditions, making it suitable for use as a structural core material in the aerospace field.
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