Preparation method of multi-layer low-gloss black polyimide thin film

A technology for preparing black polyimide and film, applied in the direction of coating, can solve the problems of high preparation cost, complex preparation process, high production control precision requirements, etc., achieve low gloss performance, simple process, improve shading performance and The effect of insulating properties
CN108070102AInactive Publication Date: 2018-05-25GUILIN ELECTRICAL EQUIP SCI RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUILIN ELECTRICAL EQUIP SCI RES INST
Publication Date
2018-05-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a multi-layer low-gloss black polyimide thin film. The preparation method comprises the following main steps: I, preparing a polyamide acid film; II, preparing a black blending polyamide acid resin solution; III, evenly coating the upper and / or lower surface of the polyamide acid film with the black blending polyamide acid resin solution, heating andcuring to obtain a multi-layer black polyamide acid film; IV, and stretching in two ways, conducting imidization and sizing to obtain the multi-layer low-gloss black polyimide thin film. The preparation of the black blending polyamide acid resin solution in the step II comprises the following steps: preparing the polyamide acid resin solution, a black slurry and a delustrant dispersion solution,adding a flocculant into the three, blending, stirring at the low temperature, defoaming, preheating, and agglomerating. The average particle size of a black pigment and a delustrant is 0.01-0.8 [mu]m, the delustrant is added into the condensation polymerization synthesis process of a polyamide acid resin, and the light transmittance, the glossiness, the electrical property and the physical and mechanical property of the obtained multi-layer thin film are obviously improved.
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Description

Technical field

[0001] The invention relates to a polyimide film preparation technology, in particular to a method for preparing a multilayer low-gloss black polyimide film. Background technique

[0002] Flexible printed circuit boards (FPC) are widely used in 3C products, optical lens modules, liquid crystal display (LCD) modules and solar cells, and polyimide film (PI film for short) is often used as its substrate Or cover film material. In the application process, because the traditional PI film has high surface flatness, the surface of the film reflects most of the incident light and produces high gloss. The high gloss film surface has glare or astigmatism caused by light reflection, which causes visual discomfort and makes eyes tired when viewed for a long time. Especially the high-gloss PI film polyimide film with black, white, blue, red and other colors, the reflected light generated on the surface has a more significant impact on vision.

[0003] On the other hand, when P...

Claims

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