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

Abstract

The invention discloses an insulation impregnating varnish of epoxy and small solvent for grade B, F general use and a preparation method thereof, which comprises bisphenol A epoxy resin, bismaleimide tung oil anhydride, tert butyl phenolic resin 2402, acetylacetone chromium promoter, industry alcohol and dimethyl carbonate; the preparation method comprises the steps: (1) 15 to 25 portions of industry alcohol, 5 to 15 portions of dimethyl carbonate, 5 to 15 portions of tert butyl phenolic resin 2402 and 0.1 to 0.5 portion of acetylacetone chromium promoter are added into a reactor and stirred; the temperature in the reactor is enhanced to 70 DEG C under the stirring effect, and the stirring is continued until the tert butyl phenolic resin 2402 completely is dissolved; (2) the obtained solution is added with 30 to 40 portions of the bismaleimide tung oil anhydride and 20 to 30 portions of bisphenol A epoxy resin to be stirred for 1 hour at 60 DEG C, being sampled; The sampled paint liquid is even and transparent, is then cooled to room temperature so as to get the insulation impregnating varnish of epoxy and small solvent for grade B, F general use. The invention has high solid content, large paint hanging amount; once impregnating varnish and baking can meet the requirement for insulation treatment, saving energy and reducing production cost.

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