A polyimide aerogel fiber and a preparation method and application thereof

Polyimide aerogel fibers were prepared by wet spinning and atmospheric pressure drying technology, which solved the problems of complex processes and low strength in existing processes, and achieved the preparation of low-density, high-strength aerogel fibers, which are suitable for weaving thermal insulation fabrics.

CN120193346BActive Publication Date: 2026-04-10DONGHUA UNIV
View PDF 1 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-17
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing polyimide aerogel fiber preparation processes are complex, and the resulting aerogel fibers have high density and low tensile strength, making it difficult to achieve large-scale production and application.

Method used

Polyamic acid precursor spinning solution was prepared by wet spinning technology, and polyimide aerogel fibers were obtained by standing in a coagulation bath and imidizing, followed by rapid drying under normal pressure.

Benefits of technology

A simple and efficient preparation of polyimide aerogel fibers has been achieved, which have low density, high porosity and excellent thermal insulation properties, with a tensile strength of up to 20.5 MPa. They are suitable for weaving thermal insulation fabrics and have a wide range of applications.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120193346B_ABST
    Figure CN120193346B_ABST
Patent Text Reader

Abstract

The application relates to the technical field of aerogel fiber preparation, and discloses a polyimide aerogel fiber and a preparation method and application thereof. The preparation method comprises the following steps: preparing a polyamide acid precursor spinning solution; spinning the polyamide acid precursor spinning solution through a wet spinning method, winding and standing in a coagulation bath to obtain a polyimide wet gel fiber; and performing solvent replacement on the polyimide wet gel fiber and rapidly drying the polyimide wet gel fiber under normal pressure to obtain a polyimide aerogel fiber. The preparation method is simple, avoids the use of a lengthy drying process and expensive drying equipment, and successfully realizes continuous molding preparation, and has a good large-scale preparation prospect. The aerogel fiber prepared by the application has excellent tensile strength, which can reach 20.5 MPa; and has low density (0.34-0.53 g.cm ‑3 -3), high porosity (63-76%) and excellent heat insulation performance, and the thermal conductivity can be as low as 36.9 W.m ‑1 -1.K ‑1 -1; and has good heat preservation effect in various complex occasions.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • A polyimide aerogel fiber, its preparation method and application

    CN113355772B

Cited By

  • A polyimide aerogel fiber, a preparation method and application thereof

    CN122235857A