A kind of polyimide fiber mica paper and preparation method thereof

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...