Black polyimide film with high electrical strength and high shielding property, and preparation process thereof

A technology of black polyimide and electric strength, which is applied in the field of polyimide film, can solve the problems of reducing electric strength of film, restricting black PI film, and poor light-shielding property of film, so as to avoid the formation of large aggregates and low light transmission efficiency and avoid side effects

Pending Publication Date: 2020-10-20
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has the situation that the shading material increases with time or falls off due to the harsh use environment (high temperature, high humidity), thus losing its use value; the black PI film prepared by the latter has better overall performance and relatively high-end application fields, but due to the micron Or the addition of nano-scale light-shielding materials, on the one hand, the film’s light-shielding performance is poor due to local aggregation, and on the other hand, due to the increase of carbon black-based light-shielding materials, the electric strength of the film is greatly reduced, which also limits the higher-end application of black PI films

Method used

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  • Black polyimide film with high electrical strength and high shielding property, and preparation process thereof

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Embodiment 1

[0026] A kind of black polyimide film with high electrical strength and high shielding property, the preparation method is as follows:

[0027] S1. First add 4,4-diaminodiphenyl ether into N,N-dimethylacetamide to dissolve, then add pyromellitic dianhydride to react, 4,4-diaminodiphenyl ether and pyromellitic The molar ratio of formic acid dianhydride is 1:0.98-1.011 to obtain polyamic acid resin, and the viscosity of polyamic acid resin is controlled to be 50-120Pa·s;

[0028] S2. Add low-conductivity carbon black, fluorinated graphene and unmodified titanium dioxide into the dispersion kettle, and add N,N-dimethylacetamide, high molecular weight copolymer alkyl ammonium salt dispersant for grinding and dispersing, stirring The rotation speed of the kettle was 2500r / min, and the grinding time was 2h to obtain a black slurry. Among them, the carbon black particle size is 25nm, the fluorinated graphene particle size is 500nm, the ratio of the two is 0.5:1, the amount of the tw...

Embodiment 2

[0033] A kind of black polyimide film with high electrical strength and high shielding property, the preparation method is as follows:

[0034] S1. First add 4,4-diaminodiphenyl ether into N,N-dimethylacetamide to dissolve, then add pyromellitic dianhydride to react, 4,4-diaminodiphenyl ether and pyromellitic The molar ratio of formic acid dianhydride is 1:0.98-1.011 to obtain polyamic acid resin, and the viscosity of polyamic acid resin is controlled to be 50-120Pa·s;

[0035] S2. Add low-conductivity carbon black, fluorinated graphene and unmodified titanium dioxide into the dispersion kettle, and add N,N-dimethylacetamide, high molecular weight copolymer alkyl ammonium salt dispersant for grinding and dispersing, stirring The rotation speed of the kettle was 2500r / min, and the grinding time was 2h to obtain a black slurry. Among them, the particle size of carbon black is 25nm, the particle size of fluorinated graphene is 500nm, the ratio of the two is 0.1:1, the amount of ...

Embodiment 3

[0040] A kind of black polyimide film with high electrical strength and high shielding property, the preparation method is as follows:

[0041] S1. First add 4,4-diaminodiphenyl ether and p-phenylenediamine into N,N-dimethylacetamide to dissolve, then add pyromellitic dianhydride to react to obtain polyamic acid resin, control resin The viscosity is 50-120Pa·s, wherein, the mass ratio of 4,4-diaminodiphenyl ether and p-phenylenediamine is 7:3, and the molar ratio of the two to pyromellitic dianhydride is 1:0.98- 1.011;

[0042] S2. Add low-conductivity carbon black, fluorinated graphene and unmodified titanium dioxide into the dispersion kettle, and add N,N-dimethylacetamide, high molecular weight copolymer alkyl ammonium salt dispersant for grinding and dispersing, stirring The rotation speed of the kettle was 2500r / min, and the grinding time was 2h to obtain a black slurry. Among them, the carbon black particle size is 25nm, the fluorinated graphene particle size is 500nm,...

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Abstract

The invention discloses a black polyimide film with high electrical strength and high shielding property, and a preparation process thereof, and relates to the technical field of polyimide films. Theblack polyimide film comprises polyamide acid resin, a black pigment, a shielding agent and a dispersing agent, wherein the black pigment is formed by compounding carbon black and fluorinated graphene. The preparation method comprises the following steps: mixing, grinding and dispersing the black pigment, the shielding agent, the solvent and the dispersing agent to obtain a black slurry, adding the black slurry into the polyamide acid resin, stirring to obtain black polyamide acid resin, casting the black polyamide acid resin to form a film, and carrying out thermal imidization, longitudinal stretching and transverse stretching to obtain the black polyimide film. The prepared black polyimide film has low light transmittance and pinhole rate, excellent electrical strength and ideal comprehensive performance, the light transmittance is smaller than 0.2%, and the electrical strength is larger than or equal to 150%.

Description

technical field [0001] The invention relates to the technical field of polyimide films, in particular to a black polyimide film with high electric strength and high shielding properties and a preparation process thereof. Background technique [0002] Polyimide (PI) refers to a class of polymers containing imide rings (-CO-N-CO-) on the main chain, among which polymers containing phthalimide structures are the most important. Polyimide is one of the organic polymer materials with the best comprehensive performance. With its excellent heat resistance, mechanical properties, electrical properties and chemical stability, it has been widely used in aerospace, rail transit, automotive medical, electrician Electronics and other technical fields, the demand is increasing. [0003] As one of the important varieties of polyimide film, black polyimide film has good light-shielding properties, insulation, heat resistance and mechanical strength, and has been widely used in optics, mobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/04C08K9/00C08K3/22C08J5/18
CPCC08J5/18C08J2379/08C08K2201/011C08K2201/003C08K3/04C08K3/042C08K9/00C08K2003/2241
Inventor 孙善卫潘成陈铸红方超史恩台
Owner ANHUI GUOFENG PLASTIC
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