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Polyimide fiber mica paper and preparation method thereof

A technology of polyimide fiber and mica paper, which is applied in the field of papermaking industry, can solve the problems of poor temperature resistance and insulation performance, achieve stable dielectric properties and temperature resistance, improve mechanical strength, and have broad application prospects

Active Publication Date: 2016-03-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a polyimide fiber mica paper, which solves the problems of poor temperature resistance and insulation performance of the mica paper prepared by the existing method

Method used

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Examples

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Effect test

preparation example Construction

[0028] A kind of preparation method of polyimide fiber mica paper of the present invention, specifically implement according to the following steps:

[0029] Step 1, modify mica:

[0030] Use waste mica paper as raw material, peel it into pieces, and use silane coupling agent to modify its surface. The modification conditions are: KH-550 is selected as silane coupling agent, and the amount added is 0.5% to 1.5% of the mass of mica. %, the stirring time of the mixer is 20-40min, and the stirring speed is 800-1200r / min;

[0031] Step 2, prepare mica slurry:

[0032] The mica modified in step 1 is decomposed by a decomposer at a speed of 800-1500r / min to make a mica slurry;

[0033] Step 3, prepare modified polyimide fiber:

[0034] The concentrated solution of polyamic acid with an intrinsic viscosity of 0.8dL / g is subjected to dry spinning and chemical cyclization to obtain polyimide fibers, and then the polyimide fibers are screened with a fiber sieve to remove the fibers. ...

Embodiment 1

[0041] Use waste mica paper as raw material, peel it into pieces, and use silane coupling agent to modify its surface. The modification conditions are: the silane coupling agent is KH-550, and the addition amount is 0.5% of the mass of mica. Mixer The stirring time is 20min, and the stirring speed is 800r / min; the modified mica is decomposed by a deflagging machine for 800r to make a mica slurry; the concentrated solution of polyamic acid with an intrinsic viscosity of 0.8dL / g is subjected to dry spinning , chemical cyclization to obtain polyimide fibers, then polyimide fibers are screened with a fiber sieve to remove fiber bundles, and then modified with phosphoric acid, the modification conditions are: use 15% of the mass concentration Phosphoric acid was modified at 40°C for 3 hours to generate new oxygen-containing groups on the surface of the fiber and increase surface wettability; the prepared modified polyimide fiber was decomposed with PEO as a dispersant, and after 150...

Embodiment 2

[0043]Use waste mica paper as raw material, peel it into pieces, and use silane coupling agent to modify its surface. The modification conditions are as follows: the silane coupling agent is KH-550, and the addition amount is 1% of the mass of mica. Mixer The stirring time is 30min, and the stirring speed is 1000r / min; the modified mica is decomposed by a deflagging machine for 1000r to make a mica slurry; the concentrated solution of polyamic acid with an intrinsic viscosity of 0.8dL / g is subjected to dry spinning , chemical cyclization to obtain polyimide fibers, then sieve the polyimide fibers with a fiber sieve to remove fiber bundles, and then modify them with phosphoric acid. The modification conditions are: use 20% mass concentration Phosphoric acid was modified at 45°C for 4 hours to generate new oxygen-containing groups on the surface of the fiber and increase surface wettability; the prepared modified polyimide fiber was decomposed with PEO for 20000r by a decomposer,...

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PUM

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Abstract

The invention discloses polyimide fiber mica paper which is formed by causing modified mica and modified polyimide fiber to undergo on-line processing in a paper sheet machine. The invention further discloses a method for preparing the mica paper. The method for preparing the mica paper comprises the steps of preparing modified mica; causing the modified mica to undergo defibering to make mica slurry; making concentrated solution of polyimide into polyimide fiber, and causing the polyimide fiber to undergo fiber bundle removal and then be modified through phosphoric acid; adding PEO into the polyimide fiber to serve as a dispersing agent, adding the polyimide fiber into the mica slurry, and obtaining the polyimide fiber mica paper through on-line forming hot-pressing drying. The paper has more stable dielectric properties and temperature resistance, the quality of an insulating material is improved, the service life of the material is prolonged, the stability of the material is improved, and the electrical industry development is promoted effectively. Besides, the polyimide fiber mica paper is simple in process steps, the controllability of process parameters is high, the raw material source is extensive, raw materials are low in price, the production conditions are mild, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of papermaking industry, and relates to a polyimide fiber mica paper, and also relates to a preparation method of the polyimide fiber mica paper. Background technique [0002] Mica paper is made of crushed mica into slurry, which is made into paper at a slow speed on a cylinder paper machine, and then cut into paper rolls. It maintains the excellent chemical stability of natural mica, and at the same time has uniform thickness and electrical resistance. Halo, small fluctuations in dielectric strength and so on. Mica tape made of glass cloth as a reinforcing material is widely used as the main insulating material in large-scale generator sets, high-grade cables, home appliances and other fields. The emergence of mica paper promotes the development of the electrical industry, and keeps pace with high-temperature plastics, optical fibers, and large-scale integrated circuits. It is known as one of the four majo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H15/12D21H13/26D21H13/44D21H21/08D01F6/74
CPCD01F6/74D21H13/26D21H13/44D21H15/12D21H21/08
Inventor 陆赵情王腊梅花莉魏宁郝杨邹文俊王贝贝毛慧敏
Owner SHAANXI UNIV OF SCI & TECH
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