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利用XRD、IR、TG等测试手段,研究不同分子量PEG与蒙脱石的相互作用机理,同时探究不同掺量及不同分子量的PEG对蒙脱石-水泥-聚羧酸型减水剂浆体流动性的影响规律。XRD的分析显示,掺加PEG的蒙脱石层间距明显增大,且随PEG分子量的增大,蒙脱石的层间距增大,说明蒙脱石与不同分子量的PEG发生插层反应;红外谱图与热重曲线也说明PEG进入了蒙脱石的层间结构;流动性的分析表明,掺加PEG后,可大幅度降低蒙脱石对水泥-聚羧酸型减水剂浆体流动性的负面影响,且随PEG分子量的增大,PEG的作用效果越显著。由此可推断,PEG进入蒙脱石的层间结构,阻碍聚羧酸型减水剂侧链结构与蒙脱石的插层反应,降低聚羧酸型减水剂的无效吸附,增强聚羧酸型减水剂的抗泥能力。
The interaction mechanism between different molecular weight PEG and montmorillonite was studied by means of XRD, IR and TG. Meanwhile, the effects of PEG with different dosages and molecular weights on the flow of montmorillonite-cement-polycarboxylate superplasticizer The law of sexual influence. XRD analysis showed that the intercalation of montmorillonite with PEG increased obviously, and the interlamellar spacing of montmorillonite increased with the increase of PEG molecular weight, indicating that intercalation of montmorillonite and PEG with different molecular weights occurred. Infrared The spectra and thermogravimetric curves also show that the PEG entered into the montmorillonite interlaminar structure. The fluidity analysis shows that the addition of PEG can greatly reduce the effect of montmorillonite on the flow of cement-polycarboxylate superplasticizer slurry Sexual negative effects, and with the PEG molecular weight increases, the more significant the effect of PEG. It can be inferred that the intercalation of PEG into the montmorillonite interferes with the intercalation reaction of the side chain structure of the polycarboxylic acid type water reducer and the montmorillonite, reduces the ineffective adsorption of the polycarboxylic type water-reducing agent, Acid-based superplasticizer anti-mud ability.