聚羧酸减水剂防腐技术研究

以两种异噻唑类防腐剂为研究对象,探讨了防腐剂对聚羧酸减水剂中细菌和霉菌的抑制作用及其对聚羧酸减水剂外观、pH值和性能的影响。结果表明:防腐剂能够抑制细菌和霉菌的生长和繁殖,对霉菌的抑制效果更为显著,因而能够有效防止聚羧酸减水剂表面发霉和溶液pH值下降;添加防腐剂后,聚羧酸减水剂的分散性有所下降,但减水剂放置时间较短时,其保坍性有所提高;当减水剂放置时间较长时,防腐剂用量对分散性下降的影响逐渐减小;综合考虑,防腐剂适宜的用量为0.05%。

Antiseptic technology of polycarboxylate water reducers

Based on two kinds of isothiazole antiseptic,we explore the effect of antiseptic on the inhibition of bacteria and fungi in polycarboxylate water reducers (PCs),and discusses the influences of antiseptic on the appearance,pH value and performance of PCs.The results show that the antiseptic can effectively inhibit the growth and reproduction of bacteria and mold,especially for the mold.Accordingly,it can prevent the PCs from becoming mouldy on the surface and decreasing of pH value.For the PCs stored in a short time,the adding of antiseptic leads to a decreasing dispersibility while an increasing dispersion stability.The effect of antiseptic content on the decreasing dispersibility of PCs is gradually diminished with the prolonged storage time.Overall,the appropriate dosage of antiseptic in PCs is 0.05%.