IMPREGNATING INSULATING VARNISH

FIELD: electric insulating varnishes for impregnating windings of electrical machines and apparatuses. ^ SUBSTANCE: used in proposed Class F (155 C) insulating varnish are epoxy-dian resin with epoxy group mass fraction of 16-18% and low-butane melamine-formaldehyde resin, as cross-linking agents, as well as tetrabutoxytitanium and 2-methylimidazole based complex at temperature of 140 C, as curing catalysts. Varnish solvents are xylene and cyclohexanon. Proposed compounding of varnish implies use of raw materials taken in following proportion, part by mass: hydroxyl-containing oligoester, 37-44; epoxy-dian resin, 17.9-19.0; low-butane melamine-formaldehyde resin, 17.9-19.0; 2-methylimidazole, 0.09-0.1; tetrabutoxytitanium, 0.41-0.43; cyclohexanon, 0.42-0.56; xylene, 14-16. ^ EFFECT: reduced cost, enhanced availability and relative safety of cross-linking agents, enhanced fraction of nonvolatile materials, viability, and cementing capacity of varnish. ^ 1 cl, 2 tbl, 9 ex