Mica paper and production method and application thereof

Abstract

The invention discloses a mica paper, which consists of fibers and mica powder, the fibers are uniformly distributed in the mica layer, moreover, the quantity of the fibers is 2 to 50 percent of the total weight of the mica paper, wherein the fibers are poly-diphenylsulfone-diphenyldiformamide fibers. The invention has the following advantages: (1), the mechanical strength of the mica paper is enhanced; (2) a relatively loose structure and voids with certain continuity are formed in the mica layer, and thereby the air permeability of a mica tape can be increased, which is more favorable for the impregnation of resin into the mica tape; (3) compared with the mechanical strength of the low-resin mica tape produced by the current domestic technique, the mechanical strength of the mica tape is enhanced, consequently, the mica tape can endure higher pulling force in the process of winding an insulation, and thereby the insulation can be more tightly wound; (4) the used heat-resistant organic fibers are better than Nomex fibers in terms of heat resistance, impregnability, radiation resistance, high-temperature dimensional stability, fire resistance and chemical stability, and also have excellent electrical insulation property.

Description

technical field [0001] The invention relates to the manufacture of powder mica paper containing polyphenylsulfone terephthalamide fiber (polyaramid sulfone fiber), and the application of the mica paper. Background technique [0002] The output of domestic high-temperature-resistant motors, such as high-speed trains and high-power traction motors, wind turbines, steel rolling motors, variable frequency motors, etc., is increasing, and the insulating materials used in them are gradually changing to higher temperature-resistant grades and higher thermal conditions. The direction of mechanical strength is developing. At present, domestic motors with a temperature resistance index above 200 use a large number of silicone-based solvent-free impregnating resins, which have high viscosity (above 500mPa.s at room temperature) and must be impregnated by heating, although the motor insulation thickness is thin ( One strand is less than 2mm), but if the resin temperature is not enough, ...

AI Technical Summary

Problems solved by technology

[0002] The output of domestic high-temperature-resistant motors such as high-speed train high-power traction motors, wind generators, steel rolling motors, and frequency conversion motors is increasing. The direction of mechanical strength is developing. At present, domestic motors with a temperature resistance index of more than 200 use a large number of organic silicon solvent-free impregnating resins, which have high viscosity (500mPa.s or more at room temperature), and must be impregnated by heating. One strand is less than 2mm), but if the temperature of the resin is not enough, the viscosity is still too high, and there is a possibility that the insulation impregnation is not full, so there is a certain risk in the application of "vacuum pressure overall impregnation, that is, VPI process" on high temperature-resistant motors

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