Preparation method of black polyimide film with static electricity prevention and shielding functions

A polyimide and anti-static technology, which is applied in the preparation of polyimide film and the preparation of anti-static polyimide shielding black film, can solve problems such as trouble, damage, casualties and equipment, and promote dispersion , stable process production, good electromagnetic shielding effect

Active Publication Date: 2015-11-25
NINGBO JINSHAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the static electricity is slightly accumulated, it brings trouble and inconvenience to life, and when it is seriously accumulated, it is not only a troublesome problem, but sometimes even causes casualties and equipment damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of preparation method of antistatic polyimide shielding black film provided by the present embodiment comprises adopting additive and polyamic acid, wherein the weight ratio of additive in polyamic acid is 0.5%; Said additive is made of nano-nickel powder , carbon black and coupling agent, in which the proportion of nano-nickel powder, carbon black and coupling agent is 2%: 97%: 1%. The coupling agent is γ-aminopropyltriethoxysilane, and the polyamic acid is obtained by polycondensation of 4,4-diaminodiphenyl ether and pyromellitic dianhydride in dimethylacetamide.

[0015] When synthesizing, first nanometer nickel powder, carbon black, coupling agent three kinds of additives are dispersed in organic solvent dimethylacetamide, then 4,4-diaminodiphenyl ether and pyromellitic dianhydride are mixed in equimolar ratio Calculate the amount of reaction required for each, and synthesize polyamic acid. During the synthesis process, first put the 4,4-diaminodiphenyl ether...

Embodiment 2

[0018] A kind of preparation method of antistatic polyimide shielding black film provided by the present embodiment comprises adopting additive and polyamic acid, wherein the weight ratio of additive in polyamic acid is 2%; Described additive is made of nano-nickel powder , carbon black and coupling agent, in which the proportion of nano-nickel powder, carbon black and coupling agent is 2%: 97%: 1%. The coupling agent is γ-methacryloxypropyltrimethoxysilane, and the polyamic acid is obtained by polycondensation of p-phenylenediamine and pyromellitic dianhydride in dimethylacetamide.

[0019] Synthetic method is identical with embodiment 1, and the volume resistivity of the antistatic polyimide shielding black film of present embodiment gained is between 10 7 Ω·cm, and its shielding effectiveness is 43dB measured by the coaxial test method.

Embodiment 3

[0021] A kind of preparation method of antistatic polyimide shielding black film provided by the present embodiment comprises adopting additive and polyamic acid, wherein the weight ratio of additive in polyamic acid is 5%; Described additive is made of nano-nickel powder , carbon black and coupling agent, in which the proportion of nano-nickel powder, carbon black and coupling agent is 2%: 97%: 1%. The coupling agent is γ-aminopropyltriethoxysilane, and the polyamic acid is obtained by polycondensation of 4,4-diaminodiphenyl ether and diphenyl ether tetracarboxylic dianhydride in N-methylpyrrolidone .

[0022] Synthetic method is identical with embodiment 1, and the volume resistivity of the antistatic polyimide shielding black film of present embodiment gained is between 10 6 Ω·cm, and its shielding effectiveness is 40dB measured by the coaxial test method.

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Abstract

The invention discloses a preparation method of a black polyimide film with static electricity prevention and shielding functions. The preparation method comprises steps as follows: an additive and polyamide acid are adopted, wherein the additive accounts for 0.5%-5% of polyamide acid in weight; the additive comprises nano-nickel powder, carbon black and a coupling agent, and nano-nickel powder accounts for 1%-8% of the total quantity of the additive; the carbon black accounts for 90%-98% of the total quantity of the additive; the coupling agent accounts for 1%-2% of the total quantity of the additive; polyamide acid is obtained from diamine and dianhydride through polycondensation in a solvent; during synthesizing, the nano-nickel powder, the carbon black and the coupling agent are dissolved in the solvent firstly, then respective required reacting weights of diamine and dianhydride are calculated in an equal molar ratio, polyamide acid is obtained through synthesis, and a product is obtained through defoaming and film casting. The product has the static electricity prevention effect, the volume resistivity of the product is 10<4>omega*cm-10<9>omega*cm, and meanwhile, the product has the excellent electromagnetic shielding effect and can be applied to the electronic fields such as a high-end flexible circuit board and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyimide film, in particular to a preparation method of an antistatic polyimide shielding black film, belonging to the field of films with antistatic and shielding effects. Background technique [0002] Since the polyimide film (PI film) was put into use in the 1960s, its excellent thermal properties, dielectric properties and mechanical properties have made it the preferred material in the electronics and aerospace industries. With the development of the electronics industry, the requirements for polyimide properties are getting higher and higher. [0003] Due to the insulating properties of general-purpose polymer materials, static electricity will inevitably accumulate during use. When static electricity accumulates slightly, it brings trouble and inconvenience to life, but when it accumulates seriously, it is not only a troublesome problem, but sometimes even causes casualties and equipment damag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L79/08C08K3/08C08K3/04C08G73/10
Inventor 岑建军吴武波吴春泉芦善波
Owner NINGBO JINSHAN NEW MATERIAL
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