Polyimide paper and preparation method thereof

A technology of polyimide paper and polyimide, applied in papermaking, paper, textiles and papermaking, etc., can solve the problems of poor mechanical strength, achieve excellent tensile strength, reduce material dielectric constant and dielectric loss The effect of reducing water absorption

Active Publication Date: 2017-05-10
BEIJING UNIV OF CHEM TECH
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of polyimide paper and preparation method t

Method used

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  • Polyimide paper and preparation method thereof

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preparation example Construction

[0015] On the one hand, the invention provides a kind of preparation method of polyimide paper, this method comprises:

[0016] (1) polyimide chopped fiber and polyimide fiber pulp are carried out surface treatment;

[0017] (2) dispersing the product obtained in step (1) in an aqueous solution containing a dispersant;

[0018] (3) The product obtained in step (2) is successively subjected to papermaking, rolling and drying;

[0019] (4) Dip or spray the solution or dispersion of the resin binder on the surface of the product obtained in step (3).

[0020] According to the method of the present invention, preferably, in step (1), the surface treatment is alkaline solution method or low temperature plasma method. The specific methods of the lye method and the low-temperature plasma method are well-known technologies in the art. Wherein, the lye can be various lyes in the art, such as KOH solution, the concentration of the KOH solution can be 1-8mol / L, and the consumption of ...

preparation example 1

[0035] The preparation method of polyimide fiber pulp is as follows: extrude the polyamic acid solution into water through a porous spinneret, control the volume ratio of the fiber in water to 20%, and make the fiber through shearing at a stirring speed of 2000r / min. Cut into short fibers of 20mm, and then pass the suspension through a disc refiner to disintegrate, cut, broom, and dry to obtain polyamic acid pulp with a length of 3mm, and finally heat-treat the pulp at 320°C to obtain a 3mm length of polyimide fiber pulp.

preparation example 2

[0037] The preparation method of polyimide fiber pulp is as follows: extrude the polyamic acid solution into water through a porous spinneret, control the volume ratio of the fiber in water to 5%, and make the fiber through shearing at a stirring speed of 1000r / min. Cut into short fibers of 30 mm, and then pass the suspension through a disc refiner to disintegrate, cut, broom, and dry to obtain polyamic acid pulp with a length of 5 mm, and finally heat-treat the pulp at 300 ° C to obtain a 5 mm length of polyimide fiber pulp.

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Abstract

The invention relates to a preparation method of polyimide paper. The method includes the steps: (1) performing surface treatment for polyimide chopped fibers and polyimide fiber pulp; (2) dispersing products obtained in the step (1) in water solution with dispersing agents; (3) sequentially performing papermaking, rolling and drying products obtained in the step (2); (4) dipping or coating the surfaces of the products obtained in the step (3) with solution or dispersing liquid of resin binders. The invention further relates to polyimide paper prepared by the method. According to the method, the polyimide fibers and the polyimide fiber pulp directly serve as raw materials, and the method can solve the problems that the polyimide fibers need to be used instantly after preparation as the polyimide fibers are degraded when being stored for a long time, and inner stress of paper surfaces is generated as shrinkage ratio is excessive when the polyimide fibers are imidized and formed. The polyimide paper prepared by the method sufficiently keeps good high-temperature resistance and insulation performance of polyimide materials and has good mechanical strength.

Description

technical field [0001] The invention relates to the field of preparation of high-performance high-temperature-resistant insulating paper, in particular to a preparation method of polyimide paper and the polyimide paper prepared by the method. Background technique [0002] High temperature resistant and high insulating paper is the most commonly used insulating material in the electrical field. Over the years, such paper products mostly use aramid fibers as raw materials and are prepared by wet papermaking and other processes. However, limited by the high temperature resistance of aramid fibers, the long-term use temperature of the obtained paper products usually does not exceed 250°C. This limits the application space of high temperature insulating paper to a certain extent. [0003] Polyimide fiber is a high-performance organic fiber developed in recent years. Its glass transition temperature can reach more than 400°C and its thermal decomposition temperature is higher th...

Claims

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Application Information

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IPC IPC(8): D21H15/10D21H13/26D21H21/08D21H27/12H01B3/52
CPCD21H13/26D21H15/10D21H17/26D21H17/31D21H21/08H01B3/52
Inventor 田国峰武德珍曾勇要韩恩林齐胜利牛鸿庆
Owner BEIJING UNIV OF CHEM TECH
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