B,F grade universal epoxy little-solvent insulating impregnating varnish and method for making same

Abstract

The invention discloses a general-purpose epoxy-less solvent insulating impregnating varnish of B and F grades and a preparation method thereof. Chromium acetylacetonate accelerator, industrial alcohol, dimethyl carbonate: the preparation method mainly includes: (1) 15-25 parts of industrial alcohol, 5-15 parts of dimethyl carbonate, 5-15 parts of 2402 tert-butyl phenolic resin , 0.1~0.5 part of chromium acetylacetonate accelerator is added into the reactor, and the temperature is raised to 70°C under stirring, until the solid 2402 tert-butyl phenolic resin is completely dissolved; (2) 30~40% of bismaleimide citronate anhydride is added. parts, 20-30 parts of bisphenol A epoxy resin, stirred at 60 ° C for 1.0 hours, sampled, the paint liquid was uniform and transparent, cooled to room temperature to obtain B, F grade general-purpose epoxy low-solvent insulating impregnating paint; the solid content of the present invention High quality, large amount of hanging paint, one-time dipping and baking can meet the requirements of insulation treatment, saving energy and reducing manufacturing costs.

Description

technical field [0001] The invention relates to a class B and F general-purpose epoxy solvent-less insulating dipping varnish, which is suitable for immersion insulation treatment of class B and F small and medium-sized motors and electric appliance coils. Background technique [0002] With the advancement of motor manufacturing technology and the enhancement of people's awareness of environmental protection, higher requirements are put forward for the impregnating varnish used for motor winding insulation in terms of energy saving and reduction of organic solvent emissions. Immersion insulating varnishes mainly include solvent impregnating varnishes, solvent-less impregnating varnishes, and solvent-free impregnating varnishes. Solvent-free impregnating varnish has the advantages of fast curing speed, one-time varnish impregnation, and high insulation quality, but the varnish liquid contains active diluents such as styrene, which partly volatilizes during the production proc...

AI Technical Summary

Problems solved by technology

Solvent-free impregnating varnish has the advantages of fast curing speed, one-time varnish impregnation, and high insulation quality, but the varnish liquid contains active diluents such as styrene, which partly volatilizes during the production process, and has a foul smell, causing environmental pollution and endangering the operator's body healthy

Compared with solvent-based paints, low-solvent impregnation paints have a higher solid content, generally above 65%, and relatively less organic solvent emissions, but the paint liquid contains some toxic solvents such as xylene, which endangers the health of operators

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