CO2固化碱性酚醛树脂的制备及固化机理研究

铸造用CO2固化碱性酚醛树脂是一种新型造型、制芯用粘结剂,它是由羟甲基含量较高的甲阶碱性酚醛树脂和含氧酸盐及碱等物质组成的混合物,甲阶碱性酚醛树脂性能及它们的组成是影响CO2固化碱性酚醛树脂砂强度的主要因素。模仿实际CO2固化酚醛树脂砂的固化过程,利用测定不同条件下碱性酚醛树脂水溶液pH值变化的方法,对CO2固化碱性酚醛树脂与不同交联剂的固化机理进行了探讨,从中得出有关CO2固化碱性酚醛树脂的交联剂和碱的用量范围,并在此基础上,考察它们和表面稳定剂对砂型抗压强度的影响,获得铸造用CO2固化碱性酚醛树脂较佳组成。

The Preparation and Elementary Research on Curing Mechanism of CO2-Cure Phenolic Resin

The CO2-cure phenolic resin is novel molding and core-making binder, which is composed of high content phenolic resin, oxacid salt and alkali and so on. Performance and constitution of phenolic resin are main factor to affect resin-sand's compressive strength. Elementary curing mechanism was studied by means of measuring pH change of the resin aqueous solution, and the better dosage ranges of cross-linking agent and alkali also were gained. The effect of their content and surface-stabilizing agent on compressive strength was studied, finally the better constitution of phenolic resin was acquired.