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通过测定蒙脱石对两种不同聚羧酸减水剂的吸附量,并结合XRD、IR、TG和XPS等测试手段,对蒙脱石与聚羧酸减水剂的插层反应机理进行了探讨。结果表明:蒙脱石对聚羧酸减水剂的吸附量约是水泥颗粒的2~3倍,聚羧酸减水剂可以与蒙脱石发生插层反应,使层间距离增大,经过JS-1、BT聚羧酸减水剂处理后的MMT的层间距分别为1.70nm、1.63nm,相比空白样,增幅分别为12.58%、7.95%;聚羧酸减水剂存在于蒙脱石的层间,不破坏蒙脱石的硅氧、铝氧层结构;蒙脱石与聚羧酸减水剂的插层反应即对聚羧酸减水剂的吸附是造成流动性损失的根本原因。
The intercalation reaction mechanism of montmorillonite and polycarboxylate superplasticizer was investigated by measuring the adsorption capacity of montmorillonite to two different polycarboxylate superplasticizers combined with XRD, IR, TG and XPS. Discussion. The results show that the adsorption capacity of montmorillonite to polycarboxylate superplasticizer is about 2 ~ 3 times that of cement particles, and polycarboxylate superplasticizer can intercalate with montmorillonite to increase the distance between layers. JS-1, BT polycarboxylate superplasticizer treated MMT layer spacing were 1.70nm, 1.63nm, compared with the blank sample, an increase of 12.58%, respectively, 7.95%; polycarboxylate superplasticizer present in the Montmorillonite Stone layer, does not destroy the montmorillonite silicon, aluminum oxide layer structure; montmorillonite and polycarboxylate superplasticizer intercalation reaction that polycarboxylate superplasticizer adsorption is the loss of liquidity caused by the fundamental the reason.