METHOD OF APPLYING ELECTROINSULATING COATING ON METAL BASE Russian patent published in 2014 - IPC C09D5/25 C25D13/06 

FIELD: chemistry.

SUBSTANCE: invention relates to obtaining electroinsulating varnishes for covering metal bases, for instance, copper wires, starter slots and electric motor armatures, conductors of printed circuit boards, etc. Method of application of electroinsulating coating on metal substrate includes preparation of electrophoretic composition based on varnish PE-939 of grade B, for which purpose it is mixed with 1% ammonia solution, ethylcellosolve and dioxane, after which into prepared electrophoretic solution submerged are two electrodes at distance 10-30 mm, one of which is electrode-product and the other is auxiliary electrode; positive potential relative to second auxiliary electrode is supplied to said electrode-product, and dense homogeneous electrophoretic sediment of film-forming is electrically precipitated on product at current density 2-10 mA/cm² for 10-20 s, after that, electrode-product is removed from varnish, placed into heat chamber, 50-60 Torr vacuum and temperature 30-40°C are created in heat chamber, and electrode-product is kept at said temperature for 20-40 s, after that said electrode-product is removed from heat chamber and placed into oven, inside which temperature 350-450°C is created, and electrode-product is kept in oven for 60-90 s, after which electrode-product is removed from oven.

EFFECT: method provides increase of quality and exploitation reliability of insulating coating: specific volume resistance, resistance to chemical reagents, elasticity, electric and mechanical strength.