摘要:
An epoxy resin powder coating composition comprises 100 parts by weight of bisphenol A mixed epoxy resin having number average molecular weight from 1,700 to 4,500 comprising a bisphenol A epoxy resin (A) having a number average molecular weight from 2,500 to 8,000 and a bisphenol A epoxy resin (B) having a number average molecular weight from 300 to 1,000 (C) a novolak epoxy resin 5 to 20 parts by weight of polyvinyl butyral resin or polyviny formal resin, a hardener, and a filler.
摘要:
A thermosetting epoxy resin based powder composition composed of an epoxy resin, a high-melting point polycarboxylic acid anhydride and calcium silicate as a filler, the high-melting point polycarboxylic acid anhydride comprising fine particles of 5 to 149 .mu.m in average size that have reacted with the epoxy resin in the molten state on their surfaces.
摘要:
An epoxy resin powder coating composition which comprises:(A) an epoxy resin comprising mainly of a bisphenol A epoxy resin mixture of (a) a bisphenol A epoxy resin having a number average molecular weight of from 2,500 to 8,000 and (b) a bisphenol A epoxy resin having a number average molecular weight of from 350 to 1,700, said mixture having a number average molecular weight of from 1,700 to 4,500;(B) rubber powder in an amount of 2 to 30 parts by weight per 100 parts by weight of said epoxy resin (A);(C) at least one hardener; and(D) a filler.The coating composition is particularly useful for the insulation of slots for motor rotors, exhibiting excellent thermal resistance, adhesiveness, impact resistance and coverage.
摘要:
An epoxy resin powder coating composition with excellent adhesibility which comprises a bisphenol A type mixed epoxy resin having a number average molecular weight of from 800 to 2,000 comprising a mixture of a bisphenol A type epoxy resin having an average molecular weight of from 350 to 1,000 and a bisphenol A type epoxy resin having a number average molecular weight of from 2,500 to 8,000, an imidazole base compound, dicyandiamide, a pre-reacted product of an imidazole base compound with epoxy resin, and a filler.
摘要:
An epoxy resin powder coating composition having excellent thermal resistance, mechanical strength, hardening speed and storage stability which comprises an epoxy resin mixture comprising a bisphenol type epoxy resin and a polyfunctional epoxy resin having at least three epoxy groups in the molecule; a hardener comprising a mixture of dicyandiamide and a compound represented by formula (I) below, and a filler: ##STR1## wherein, R.sup.1 represents an alkyl group or an aryl group, and preferably represents a phenyl group from the view of storage stability; and R.sup.2 represents a cyanoethyl group, a vinyl group, or a phenyl group.The powder coating composition is suitably used in fixing stator coils or armature coils in motors or generators.
摘要:
An epoxy resin based powder coating composition is disclosed, comprising an epoxy resin, a reaction product of dicyclopentadiene and maleic anhydride, and a cure accelerator.The coating composition may further comprise an aromatic acid anhydride based curing agent, an impact modifier and a surface smoothing agent.The coating composition has stable powder characteristic and provides good heat resistance and electrical insulation.