| 摘要 |
PURPOSE:To obtain a low-cost electric apparatus having excellent curability, crack resistance, flame retardance and thermal conductivity by filling special filler in a case for containing components, then transferring special urethane resin composition therein by special vacuum degree, and curing it. CONSTITUTION:A method for manufacturing an electric apparatus comprises the steps of first filling filler A having a mean particle size of 300mum or more in a case for containing components, then transferring urethane resin composition containing one or more of liquidlike polybutadiene series polyol, castor oil and castor oil ester exchange, polyisocyanate as well as filler B having a mean particle size of 100mum or less, a viscosity of the composition of 4Pa.s or less and flame resistance of the cured material of UL94V-2 or more (a thickness of a test piece of 5mm or less) in a vacuum degree of 100Torr or less, and curing it. |
