高性能壳法用酚醛树脂的微波合成

Research on Microwave-assisted Synthesis of Novolacs for High Performance Shell Molding

针对双酚A改性酚醛树脂固化速度慢的缺点,研究了复合催化和水杨酸改性对树脂微波合成的影响。结果表明,在微波作用下,先用某类二价金属弱酸盐A,再用草酸进一步催化,并结合双酚A及水杨酸改性,可得到高强度、低游离酚、快固化的高性能壳法用酚醛树脂。

Aimed at the drawback of the slow cure rate of the resins modified by bisphenol A, the effect of the compound catalyst and salicylic acid on the microwave-assisted synthesis of novolacs was investigated. The results show that the resins used in high performance shell molding with high strength, low free-phenol and fast cure rate, can be obtained through proper selection of the different catalysts in a two step manner, whereby the first step is a certain bivalent metal salt （catalyst A） followed by oxalic acid associated with the modification of bisphenol A and salicylic acid.