INSULATING ENAMEL Russian patent published in 2008 - IPC H01B3/40 

FIELD: technological processes.

SUBSTANCE: invention is related to finishing baking enamels intended for production of insulating protective coatings for impregnated windings, units and parts of electric machines and devices with insulation of thermal endurance class of (155°C). Enamel that includes filming agent, coupling agent, siccative, pigments, fillers, desired additives and organic dissolvents, as filming agent it contains epoxy ester produced by reactions of etherification and thermal polymerisation 1.0 Mole of epoxy modified resins with content of epoxy groups of 3.5÷4.5 wt %, 2.4 Mole of fatty acids of bodied oils and 1.3 Mole of colophony, and as active filler for increase of electric strength of enamel coating it additionally contains hydrophobic aerosil at the following ratio: Epoxy ester (55%-solution in xylene) 62.0÷81.0, Hydrophobic aerosil 0.3÷0.6, Hydrophobic aerosol 0.3÷0.6, Pigments and fillers 13.0÷29.0, Hydrophobic aerosil 0.3÷0.6, Coupling agent 4.5÷5.5, Desired additives (dispenser, defoaming agent, thixotropic, anti-flotation, antioxidant) 1.5÷6.5, Siccative (cobalt oktoat) 0.2÷0.5, Organic dissolvents 1.5÷7.5.

EFFECT: higher class of enamel thermal endurance, higher adhesion of enamel coating, improvement of coating dielectric properties.

2 tbl, 7 ex