Preparation method of high-permeability mica tape

Abstract

The invention discloses a preparation method of a high-permeability mica tape. The high-permeability mica tape comprises: a mica paper layer (1) and a reinforcement material layer (4). The high-permeability mica tape is characterized in that: an adhesive layer (2) is sprayed between the mica paper layer (1) and the reinforcement material layer (4); the mica paper layer (1) is mica paper possessing the high permeability; the adhesive layer (2) is a solventless powdered resin which forms point distribution and a large amount of pore channels (3) exist between the pointlike resin. The method comprises the following steps: (1) respectively rewinding the mica paper and the reinforcement material and spraying the solventless adhesive resin powder on the mica paper; (2) after the mica paper sprayed with the adhesive resin powder is preheated, performing hot pressing and compositing, winding and cutting to the mica paper and the reinforcement material so as to obtain the high-permeability mica tape. The prepared mica tape possesses the high permeability. Adhesive contents are small. Flexibility is good. A caking property of the reinforcement material and the mica paper is good. The mica tape can be stored for a long time, can not harden and can not be crisp. A winding technology is good and the mica tape has many other advantages. The mica tape is suitable for insulation processing of various kinds of motors or electric appliance products and especially suitable for a large high-voltage generator set, whose voltage range is 13.8-27Kv. The mica tape is suitable for a main insulation VPI processing technology of a coil (stator bar) with a unilateral insulation thickness of 4-8mm. Soakage time can be shortened.

Description

technical field [0001] The invention belongs to the technical field of glue-less vacuum pressure impregnation insulation treatment, and in particular relates to a preparation method of a highly air-permeable glue-less mica tape. Background technique [0002] With the continuous improvement of motor voltage level and capacity, the requirements for motor insulation are also continuously improved. At present, there are mainly two insulation treatment processes for large high-voltage motors, vacuum pressure impregnation (VPI) with less glue and molding with more glue. In the 1970s, multinational corporations such as Westinghouse Electric proposed the theory of less glue in motor insulation, and began to use the new VPI insulation process with less glue mica tape as the main insulation material to produce high-voltage motors. Because the less glue VPI main insulation increases the mica content, on the one hand, it can greatly reduce the insulation thickness, and at the same time...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of preparation method of environment-friendly high air permeability mica tape with less glue, solve the problem that the mica tape with less glue produced by the existing impregnation and glue coating process has poor air permeability and cannot completely soak into the coil (rod) with thicker insulation thickness , and during the storage process, the mica tape tends to become hard and brittle, and the wrapping process becomes poor, etc.

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