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Solvent-resistant colorless transparent cross-linked polyimide film and preparation method thereof

A polyimide film, cross-linked technology, applied in the field of optical materials, can solve the problems of polyimide resin solvent resistance decline, reduce film dimensional stability, light transmittance, limit the application of optical fields, etc., to achieve Effect of improving light transparency, colorless and transparent solvent resistance, colorless and transparent heat resistance and mechanical properties

Active Publication Date: 2020-04-28
浙江中科玖源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Solvent-resistant colorless transparent cross-linked polyimide film and preparation method thereof
  • Solvent-resistant colorless transparent cross-linked polyimide film and preparation method thereof
  • Solvent-resistant colorless transparent cross-linked polyimide film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A solvent-resistant, colorless and transparent cross-linked polyimide film, and its preparation method includes:

[0050] S1. Under nitrogen atmosphere, dissolve 8mmol 4,4'-diaminodiphenyl ether and 2mmol 2-(3-aminophenyl)-5-aminobenzimidazole as diamine monomer raw materials in 30ml N, N -In the solvent of dimethylacetamide, stir until it is completely dissolved, add 10mmol 4,4'-(hexafluoroisopropylene) diphthalic anhydride as the raw material of the tetracarboxylic dianhydride monomer, and continue stirring until all is dissolved to obtain a solid A homogeneous solution with a content of 20% by weight was reacted at 5°C for 8 hours to obtain a viscous polyamic acid solution. 4mmol of cyclohexane-1,2-dicarboxylic acid diglycidyl ester was added to the polyamic acid solution As a crosslinking agent, add 0.98ml of pyridine as imidization agent, add 9.5ml of acetic anhydride as a dehydrating agent after the dispersion is complete, stir again for 4h, then transfer the reactio...

Embodiment 2

[0053] A solvent-resistant, colorless and transparent cross-linked polyimide film. The preparation method of the polyimide film is the same as in Example 1, except that 8mmol 2 is added in the synthesis of polyimide resin in step S1. , 2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and 2mmol 2-(3-aminophenyl)-5-aminobenzimidazole as the diamine monomer raw materials, thus obtained The relevant performance test results of the polyimide film are shown in Table 1.

Embodiment 3

[0055] A solvent-resistant, colorless and transparent cross-linked polyimide film. The preparation method of the polyimide film is the same as that in Example 1, except that in the synthesis of polyimide resin in step S1, 8mmol 4 is added. , 4'-bis(2-trifluoromethyl-4-aminophenoxy)benzene and 2mmol 2-(3-aminophenyl)-5-aminobenzimidazole as the diamine monomer raw materials, thus obtained The relevant performance test results of the polyimide film are shown in Table 1.

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Abstract

The invention provides a solvent-resistant colorless transparent cross-linked polyimide film. The transmittance of light with the wavelength of 400 nm can reach 80% or above, and meanwhile the solventresistance index is within 1%. Meanwhile, the invention further provides application of the cross-linked polyimide film to photoelectric display devices and other products and components with high requirements on light transmission and solvent resistance.

Description

Technical field [0001] The invention relates to the technical field of optical materials, in particular to a solvent-resistant, colorless and transparent cross-linked polyimide film and a preparation method. Background technique [0002] Polyimide is one of the materials with the best heat resistance in existing polymers, and aromatic polyimide has excellent heat resistance due to its rigid molecular chain structure and strong intermolecular force. It also has thermal stability, dimensional stability, mechanical properties, chemical stability and radiation resistance. In addition, the designability of the polyimide molecule and the special two-step reaction characteristics make it more advantageous in processing, application and research compared to other rigid chain polymers. Therefore, polyimide has become the cover plate and One of the best choices of substrate material. [0003] However, the polyimide resin has a certain brown or yellow color due to the charge transfer comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08J5/18C08G73/10
CPCC08J5/18C08G73/1085C08G73/1064C08G73/1042C08G73/1078C08G73/1039C08G73/1071C08J2379/08Y02E10/549
Inventor 李南文许辉
Owner 浙江中科玖源新材料有限公司
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