A polyimide paper with controllable electrical properties and its preparation method

A technology of polyimide paper and polyimide, which is applied in papermaking, physical treatment of paper, textiles and papermaking, etc., can solve the problems of high production cost, uncontrollable electrical properties, low paper strength, etc., and simplify production steps. , the effect of improving research level and enriching variety forms

Active Publication Date: 2021-04-02
JIANGSU XIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a polyimide paper with controllable electrical properties and its preparation method in order to overcome the defects of uncontrollable electrical properties, low paper strength, and high production cost of polyimide paper in the prior art.

Method used

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  • A polyimide paper with controllable electrical properties and its preparation method
  • A polyimide paper with controllable electrical properties and its preparation method

Examples

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preparation example Construction

[0013] On the one hand, the present invention provides a kind of preparation method of polyimide paper with controllable electric performance, and the method comprises:

[0014] (1) Disperse polyimide chopped fibers, polyimide conductive fibers, polyamic acid precipitated fibers and polyimide precipitated fibers in an aqueous solution, or polyimide chopped fibers, polyimide Imide conductive fibers and polyimide precipitated fibers are dispersed in the aqueous solution, and then the polyamic acid solution is mixed with polyimide chopped fibers, polyimide conductive fibers and polyimide precipitated under stirring conditions. Precipitate in the aqueous solution of the fiber to make polyamic acid form polyamic acid precipitated fiber, and make polyimide-containing chopped fiber, polyimide conductive fiber, polyamic acid precipitated fiber and polyimide precipitated fiber Aqueous solution of fiber;

[0015] (2) The product obtained in step (1) is subjected to papermaking, rolling...

preparation example 1

[0049] This preparation example is used to prepare polyamic acid fibrids and polyimide fibrids.

[0050] (1) Dissolve 3,4-diaminodiphenyl ether in a mixed solvent of N,N-dimethylacetamide and xylene with a volume ratio of 6:1, and then add acid anhydride monomers (acid anhydride monomers The composition is: 2,3,3',4'-biphenyl tetra-acid dianhydride, 3,3',4,4'-benzophenone tetra-acid dianhydride and 3,3',4,4'-biphenyl tetra-acid dianhydride Phenyl ether tetra-acid dianhydride, the weight ratio is 1:1:5), the molar ratio of 3,4-diaminodiphenyl ether and acid anhydride monomer is controlled to be 1:0.95, and the solid content in every liter of mixed solvent is 200g , stirring and reacting at 10°C for 2h to generate polyamic acid product;

[0051] (2) Add the above-mentioned mixed solvent to the polyamic acid product obtained in step (1) until the content of polyamic acid is 5% by weight, and the solution viscosity is 200cp, and then inject it at 30°C and 600r / min stirring speed ...

preparation example 2

[0055] This preparation example is used to prepare polyamic acid fibrids and polyimide fibrids.

[0056] (1) Hexafluorodiamine is dissolved in N, N-dimethylacetamide and xylene in a mixed solvent with a volume ratio of 7:1, and then an acid anhydride monomer is added (the composition of the acid anhydride monomer is: 2 , 3,3',4'-biphenyl tetraacid dianhydride, 3,3',4,4'-benzophenone tetraacid dianhydride and 3,3',4,4'-diphenyl ether tetraacid di Anhydride, the weight ratio is 1:2:2), the molar ratio of hexafluorodiamine and acid anhydride monomer is controlled to be 1:1, and the solid content in each liter of mixed solvent is 240g, and the reaction is stirred at 25°C for 1h to form poly Amic acid products;

[0057] (2) Add the above-mentioned mixed solvent to the polyamic acid product obtained in step (1) until the content of polyamic acid is 7% by weight, and the solution viscosity is 250cp, and then inject it at 50°C and 800r / min stirring speed In deionized water, continue...

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Abstract

The invention relates to the field of high-performance specialty paper products. The invention provides a preparation method of a piece of polyimide paper with controllable electrical property, and also provides the polyimide paper with controllable electrical property. The polyimide paper realizes controllable electrical property, and compared with prior polyimide paper, the strength and high temperature resistance of the polyimide paper are more excellent; concretely, the density of the polyimide paper with controllable electrical property is 0.4-1.4 g / cm<3>, the surface resistivity is controllable between 50-10<13> ohm / sq, tensile index reaches 41-96N.m / g, and after 24 hours at 300 DEG C, the strength retention reaches 95-99%.

Description

technical field [0001] The invention relates to the field of high-performance special paper products, in particular to a method for preparing polyimide paper with controllable electrical properties, and the polyimide paper with controllable electrical properties prepared by the method. Background technique [0002] With the rapid development of high-tech such as my country's high-speed rail, large aircraft, and transport aircraft, higher requirements are put forward for the temperature grade and functionality of high-performance electrical insulation materials, antistatic materials, and anti-corona materials. For a long time, aramid paper represented by DuPont's NOMEX series of paper products has been used in the preparation of high-performance motors, dry-type transformers, aviation paper honeycomb and other equipment or products because of its high temperature resistance, high strength and high insulation. It is an essential key material, and the product has been monopoliz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H15/02D21H17/67D21H25/04
CPCD21H13/26D21H15/02D21H17/67D21H25/04
Inventor 俞建刚
Owner JIANGSU XIANNUO NEW MATERIAL TECH
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