Mica paper and production method and application thereof

A technology of powdered mica paper and powdered mica, applied in the direction of winding insulation materials, etc., can solve the problems of insufficient insulation impregnation, high viscosity, etc., and achieve the effect of improving air permeability and excellent electrical insulation performance

CN102330380AInactive Publication Date: 2012-01-25上海同立电工材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-01-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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, ...

Examples

Embodiment Construction

[0025] A powder mica paper, the powder mica paper is composed of fibers and powder mica, the fibers are poly-p-phenyl-sulfone terephthalamide fibers, and the poly-p-phenyl sulfone terephthalamide fibers are evenly distributed on the mica. layer, and the amount of fibers is 2% to 50% of the total mass of the mica paper, such as 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% %, 50%, etc.

[0026] The powder mica is non-calcined muscovite or calcined muscovite, and the mica is pulped by a hydraulic crushing method.

[0027] The fibers have an average length of 0.01-12 mm and an average diameter of 0.1-50 μm.

[0028] A method for manufacturing the powder mica paper, comprising soaking the poly(p-phenylene sulfone terephthalamide) fibers in water and stirring to prepare fiber slurry, and mixing with the powder mica slurry, and the amount of fibers is the total amount of mica paper. 2% to 50% of the mass, stir evenly in the pulp tank, pump it to the paper machine, and make it on ...