A kind of solvent-resistant and colorless and transparent cross-linked polyimide film and preparation method

Abstract

The invention provides a solvent-resistant, colorless and transparent cross-linked polyimide film, the transmittance of the 400nm wavelength light can reach more than 80% and the solvent resistance index is within 1%. At the same time, the present invention also proposes to use the cross-linked polyimide film for photoelectric display devices and other products and components that have high requirements for light transmission and solvent resistance.

Description

Solvent-resistant, colorless and transparent cross-linked polyimide film and preparation method thereof technical field The present invention relates to the technical field of optical materials, in particular to a kind of solvent-resistant and colorless and transparent cross-linked polyimide Amine film and preparation method. Background technique Polyimide is one of the materials with the best heat resistance in existing polymers, and aromatic polyimide is Molecular chain structure and strong intermolecular force, in addition to excellent heat resistance, it also has thermal stability, dimensional stability properties, mechanical properties, chemical stability and radiation resistance. In addition, the designability of polyimide molecules and the special two-step reaction Its characteristics make it more advantageous in processing, application and research than other rigid chain polymers, so polyimide It has become one of the best choices for OLED display cover an...

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Problems solved by technology

[0003] However, polyimide resin has a certain brown or yellow color due to the intramolecular or intermolecular charge transfer complex, so the transmittance in the visible light range is low, which limits its application in the optical field.

The problem of the developed colorless and transparent polyimide film is that the original solvent resistance of polyimide resin has dropped a lot.

[0004] Previously, the applicant developed an effective method to improve the solvent resistance and dimensional stability of polyimide films, that is, it can be modified by cross-linking rigid polyimides containing benzimidazole group structures, but in When adding a dihalogenated hydrocarbon crosslinking agent, complexed HCl will be generated due to the crosslinking reaction in the initial heating stage, forming blank reaction sites, which will reduce the dimensional stability, light transmittance and other properties of the film

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