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Black polyimide film and preparation method thereof

A technology for preparing black polyimide and film, applied in the field of black polyimide film and its preparation, black matte type polyimide film, can solve the problems of poor dispersion effect, dispersion time affecting production efficiency, etc. Ensure dispersion effect, good coloring ability, high thermal expansion coefficient effect

Inactive Publication Date: 2015-11-11
万达集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method of dispersing carbon powder in polyamic acid resin has problems such as poor dispersion effect, or the dispersion time greatly affects production efficiency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A kind of black polyimide film preparation method, comprises the following steps:

[0032] (1) Preparation of black mixed solution:

[0033] ① Weigh carbon powder and dimethylacetamide solution, and mix according to the ratio of 1:4 to obtain a mixed solution;

[0034] ②Place the mixed solution in the ball mill tank in the ball mill for stirring to obtain a black mixed solution;

[0035] (2) Preparation of polyimide film:

[0036] ① Mix the black mixture after ball milling with the polyamic acid resin in a ratio of 7:100;

[0037] ② Stir to obtain polyamide black powder mixed resin with fully dispersed carbon powder;

[0038] ③ The obtained polyamide black powder mixed resin is imidized by casting and stretching to obtain a black polyimide film.

[0039] Further, ceramic balls occupying 1 / 4 of the volume of the ball milling pot are arranged in the ball milling pot in step ② in the step (1).

[0040] Further, the stirring speed in step ② in step (1) is 100 rpm, and ...

Embodiment 1

[0044] ① Weigh 1 part of carbon powder and 4 parts of dimethylacetamide solution and mix to obtain a mixed solution;

[0045] ②Put the mixed solution in the ball mill tank in the ball mill for stirring to obtain 5 parts of the black mixed solution;

[0046] ③The black solution obtained is mixed with 70 parts of polyamic acid resin;

[0047] ④ Stir the mixed solution until the polyamide black powder mixed resin with fully dispersed carbon powder;

[0048] ⑤The obtained polyamide black powder mixed resin is imidized by casting and stretching at 350°C to obtain a black polyimide film.

Embodiment 2

[0050] ① Weigh 1.4 parts of carbon powder and 5.6 parts of dimethylacetamide solution and mix to obtain a mixed solution;

[0051] ②Put the mixed solution in the ball mill tank in the ball mill for stirring to obtain 7 parts of black mixed solution;

[0052] ③ mixing the obtained black solution with 100 parts of polyamic acid resin;

[0053] ④ Stir the mixed solution until the polyamide black powder mixed resin with fully dispersed carbon powder;

[0054]⑤The obtained polyamide black powder mixed resin is imidized by casting and stretching at 350°C to obtain a black polyimide film.

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Abstract

The invention relates to a black dulling polyimide film, belongs to the field of high polymer materials, and particularly relates to a black polyimide film and a preparation method thereof. The black polyimide film comprises black mixed solution and polyamic acid resin, wherein the black mixed solution is composed of carbon powder and a dimethylacetamide solution. The black polyimide film comprises 5-15 parts of black mixed solution and 70-215 parts of polyamic acid resin. The black mixed solution comprises, by weight parts, 1-3 parts of carbon powder and 4-12 parts of dimethylacetamide solution. Packing adopted for the black polyimide film has good dyeing capability, is excellent in color stabilizing performance and can be well dispersed in the polyamic acid resin to form uniform and stable suspension. Compared with the prior art, according to the black polyimide film and the preparation method, the dispersion time of the carbon powder is shortened, the dispersion effect is guaranteed; and the produced film is stable in thermal properties, high in coefficient of thermal expansion and thermal decomposition temperature, and wide in use range.

Description

technical field [0001] The invention relates to a black matting polyimide film, which belongs to the field of polymer materials, in particular to a black polyimide film and a preparation method thereof. Background technique [0002] Black PI film has a long history and is widely used. For example: black tape, black anti-static tape, black reinforcing plate, black cover film, black speaker voice coil, black label, black gasket, black light-shielding sheet, black anti-shielding material, black sound diaphragm, LCD module binding and Substituting a large number of black PEI films, etc. Black cover film is one of the series products of black PI film. Compared with ordinary cover film, it is opaque, does not reflect backlight, has good confidentiality, uniform color, and excellent product consistency. It can be used for LED lighting, interference printed circuit boards, etc. . [0003] As far as the preparation technology of the black cover film is concerned, there are two com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/04
CPCC08K3/04C08J5/18C08J2379/08C08L2201/08C08L2203/16C08L79/08
Inventor 尚吉永程翠华贾怀星孙春庆初明辉许亚杰吴旭博王修忠李树青
Owner 万达集团股份有限公司
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