| 摘要 |
FIELD: electricity.SUBSTANCE: compound casting method for electrical goods includes mixing of components with receipt of the compound and casting of the electrical goods with the compound. At that before casting an electrical good is heated at temperature of 50-55°C and residual pressure of 10-15 mm hg at least during 3 hours. The compound is received by mixing of predried components in the following ratio, g: styrene - 50, castor oil - 38, product 102T - 12, benzoyl peroxide paste - 1. The paste made by mixing of predried benzoyl peroxide with dibutyl phthalate is used as the benzoyl peroxide paste. At that before casting the compound is vacuumised additionally at temperature of 15-35°C and residual pressure of 10-15 mm hg at least during 3-5 minutes. The pretreated electrical goods and compound are heated in the same furnace at temperature of 70°C during 1 hour. Then the heated electrical goods are casted step by step with the hot compound by the free casting method initially to ? of the electrical good height or volume with further vacuum degassing of the casted electrical goods at temperature of 15-35°C and residual pressure of 10-15 mm hg during 15-20 minutes with further casting of the electrical good with the same compound up to the required level. The multistage polymerisation of the compound is carried out. At that the casted electrical goods are held in the furnace heated up to 70°C during 4 hours at first, then they are casted with the same compound and its polymerisation takes place again at temperature of 70°C during 4 hours.EFFECT: non-availability of defects in the form of cracks and air bubbles in the compound mass thus ensuring high quality of the casted electrical goods, and namely increasing their electric strength and reducing quantity of wastes. |
