Self-lubricating polyimide varnish and polyimide coatings produced therefrom

A self-lubricating polyimide varnish with reduced friction, using polyamic acid, nanosilica, and a silicon-based additive, addresses the deformation issue in electric vehicle windings, enhancing processing efficiency and maintaining key properties.

JP7884099B2Active Publication Date: 2026-07-02PI ADVANCED MATERIALS CO LTD
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Patent Information

Application Number
JP2024576492
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-06-29
Filing Date
2023-06-27
Publication Date
2026-07-02
Estimated Expiration
2043-06-27

AI Technical Summary

Technical Problem

Polyimide varnishes used for insulating coatings on electric vehicle windings face high frictional forces during processing, leading to deformation of windings and reduced workability.

Method used

A self-lubricating polyimide varnish is developed using polyamic acid, nanosilica surface-modified with organosilane, and a silicon-based additive to reduce friction, while maintaining heat resistance, insulation, and mechanical properties.

Benefits of technology

The self-lubricating polyimide varnish improves processing efficiency by reducing friction, ensuring the integrity of winding shapes and maintaining essential properties like adhesion and mechanical strength.

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Patent Text Reader

Abstract

The present invention provides a polyimide varnish containing a polyamic acid containing one or more dianhydride monomers and one or more diamine monomers as polymerization units, nanosilica surface-modified with an organic silane, a silicon-based additive represented by the following Chemical Formula 1, and an organic solvent. 【Chemical Formula 1】 TIFF2025521661000009.tif42168
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Citation Information

Patent Citations

  • Polyimide Varnish for Improving Heat Resistance of Polyimide Coating Article and Polyimide Coating Article Prepared Therefrom

    KR101992576B1

  • Polyamide composition, method for producing same, polyamic acid solution, polyimide, polyimide film, laminate, production method thereof, flexible device, and method for producing flexible device

    WO2020189759A1