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A kind of 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 quality, prolong service life and stability Effect

Active Publication Date: 2017-06-09
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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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 sieve the polyimide fibers with a fiber sieve to remove fiber bundles, and then modify them with phosphoric acid. The modification conditions are: use 15% of 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 15000r ...

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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Abstract

The invention discloses a polyimide fiber mica paper, which is prepared by modifying mica and modified polyimide fibers through a paper sheet machine and forming on the net; the invention also discloses a preparation method of the above mica paper: Preparation of modified mica; the modified mica is decomposed to obtain mica slurry; the concentrated solution of polyamic acid is made into polyimide fiber, and then the polyimide fiber is removed from the fiber bundle, and then modified with phosphoric acid ; Add PEO to polyimide fiber as a dispersant, add modified polyimide fiber to mica slurry, and make it through online molding, hot pressing and drying. The invention endows paper with more stable dielectric properties and temperature resistance, improves the quality of insulating materials, prolongs the service life and stability of materials, and effectively promotes the development of the electrical industry; The parameters are highly controllable, the sources of raw materials are extensive and cheap, the production conditions are mild, and the application prospects are broad.

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 Patents(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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