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Black matte polyimide film and preparation method thereof

A polyimide film, black matte technology, applied in the field of polyimide film, can solve the problems of reducing the electrical breakdown strength of PI film, the difficulty of carbon black dispersion, etc., to achieve the reduction of visible light transmittance, high electrical shock Wear strength, reduce the effect of light transmittance

Active Publication Date: 2020-05-29
株洲时代华鑫新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon black also reduces the electrical breakdown strength of the PI film while improving the black light-shielding property, and the dispersion of carbon black is also extremely difficult.

Method used

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  • Black matte polyimide film and preparation method thereof
  • Black matte polyimide film and preparation method thereof
  • Black matte polyimide film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A kind of black matte polyimide film of the present invention, in this polyimide film, mass content is evenly distributed with the carbon quantum dot (average particle diameter 5nm) of 1wt%, the titanium dioxide powder of 2wt% (average particle diameter is 230nm), 5wt% of diamond powder (average particle size of 5000nm) and 2wt% of neutral carbon black.

[0035] The preparation method of the black matt polyimide film of the present embodiment may further comprise the steps:

[0036] (1) Preparation of black inorganic slurry: take 400kg DMF solution by weighing, add 0.3kg polyether polymer (dispersant S-100), after stirring evenly, add 1kg carbon quantum dots (average particle diameter 5nm), 2kg titanium dioxide powder ( Average particle diameter is 230nm), 5kg diamond powder (average particle diameter is 5000nm) and 2kg neutral carbon black (N110 brand carbon black of Cabot Company), then disperse 30min under the high-speed disperser of 3000r / min, place then Grind in a...

Embodiment 2

[0064] A kind of black matte polyimide film of the present invention, in this polyimide film, mass content is evenly distributed with the carbon quantum dot (average particle diameter 5nm) of 1wt%, the titanium dioxide powder of 2wt% (average particle diameter is 230nm), 5wt% of diamond powder (average particle size is 5000nm) and 2wt% of neutral carbon black (N110 grade carbon black of Cabot Corporation).

[0065] The preparation method of the black matt polyimide film of the present embodiment may further comprise the steps:

[0066] (1) Preparation of black inorganic slurry: Weigh 400kg DMF solution, add 0.3kg polyether polymer (dispersant S-100) dispersant, stir well and then add 1kg carbon quantum dots, 2kg titanium dioxide powder, 5kg diamond powder and 2kg of neutral carbon black, then disperse for 30min under a high-speed disperser at 3000r / min, then place it in a sand mill and grind for 2h to obtain a black inorganic slurry;

[0067] (2) Preparation of inorganic fill...

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Abstract

The invention discloses a black matte polyimide film. Carbon quantum dots, titanium dioxide powder, diamond powder and carbon black are uniformly distributed in the polyimide film. The preparation method of the black matte polyimide film comprises the following steps: adding carbon quantum dots, titanium dioxide powder, diamond powder and carbon black into an organic solvent, adding a dispersing agent, grinding to obtain black slurry; adding diamine and aromatic dianhydride into the black slurry, stirring, stopping stirring after the viscosity of the reaction system reaches 1500-4000 Pa.s, carrying out a vacuum defoaming treatment, forming a film, and heating to carry out imidization to obtain the black matte polyimide film. The black polyimide film has light transmittance of less than orequal to 0.45%, glossiness of less than or equal to 25GU, electric field breakdown strength of more than or equal to 140kV / mm, tensile strength of more than or equal to 210MPa and elongation at breakof more than or equal to 60.5% in a visible light range, and has a good shading effect, electrical insulation property and mechanical property.

Description

technical field [0001] The invention belongs to polyimide films, in particular to a black matte polyimide film and a preparation method thereof. Background technique [0002] PI film is often used as the base material or cover film material of flexible circuit board (FPC). However, due to the high surface gloss and high transparency of the traditional PI film, there will be glare or astigmatism caused by light reflection during the application process, so it is required PI film has low light transmittance and low gloss. [0003] Black matte PI film can well meet the above requirements, and its traditional manufacturing method is to add a large amount of carbon black pigment and matting powder such as silicon dioxide or polyimide powder. However, carbon black also reduces the electrical breakdown strength of the PI film while improving the black light-shielding property, and the dispersion of carbon black is also extremely difficult. Therefore, how to ensure the electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/00C08K3/04C08K3/22C08J5/18
CPCC08J5/18C08J2379/08C08K3/00C08K3/04C08K2003/2241C08K2201/014C08K2201/003Y02E10/50
Inventor 刘磊张步峰杨军廖波温友张文祥
Owner 株洲时代华鑫新材料技术有限公司
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