粘土矿物对聚羧酸减水剂性能的影响及机理研究
发布时间：2019-05-18 10:21
【摘要】：研究了粘土矿物对聚羧酸减水剂性能的影响规律，探索了粘土矿物与聚羧酸减水剂的相互作用机理，，并提出改善措施。研究表明：粘土矿物影响聚羧酸减水剂的分散性能，其影响程度与粘土矿物自身的分子结构有关，其中蒙脱土对聚羧酸减水剂的影响最为显著。酸醚比较低及侧链较短的聚羧酸减水剂抗粘土矿物的能力更强。脂肪族减水剂相对于聚羧酸减水剂具有较好的抗粘土矿物性能。粘土矿物与聚羧酸减水剂的相互作用受溶液中pH值及无机盐的离子浓度的影响，硅酸钠、阳离子表面活性剂、阴离子表面活性剂、粘土稳定剂等具有较好地改善粘土矿物对聚羧酸减水剂性能影响的作用。粘土稳定剂可以吸附在粘土矿物的层间和表面，降低了粘土矿物吸水膨胀，阻止粘土矿物吸附聚羧酸减水剂。XRD测试证实了聚羧酸减水剂的侧链进入到了粘土矿物的层间，聚羧酸减水剂可能通过氢键作用锚固在粘土矿物的层间。
[Abstract]:The effect of clay minerals on the properties of polycarboxylic acid superplasticizer was studied, the interaction mechanism between clay mineral and polycarboxylic acid superplasticizer was explored, and the improvement measures were put forward. The results show that clay minerals affect the dispersion properties of polycarboxylic acid water reducer, and the degree of influence is related to the molecular structure of clay minerals, among which montmorillonite has the most significant effect on polycarboxylic acid water reducer. The polycarboxylic acid water reducer with low acid ether and short side chain has stronger ability to resist clay minerals. Aliphatic water reducer has better anti-clay mineral properties than polycarboxylic acid water reducer. The interaction between clay minerals and polycarboxylic acid water reducer is affected by pH value in solution and ion concentration of inorganic salt, such as sodium silicate, cationic surfactants, anionic surfactants, Clay stabilizer and so on can improve the effect of clay minerals on the properties of polycarboxylic acid superplasticizer. Clay stabilizer can be adsorbed on the interlayer and surface of clay minerals, which reduces the water absorption and expansion of clay minerals and prevents clay minerals from adsorbing polycarboxylic acid water reducer. XRD test confirmed that the side chain of polycarboxylic acid water reducer entered the interlayer of clay minerals. Polycarboxylic acid water reducer may be anchored in the interlayer of clay minerals by hydrogen bond.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU528.042.2
本文编号：2479913
[Abstract]:The effect of clay minerals on the properties of polycarboxylic acid superplasticizer was studied, the interaction mechanism between clay mineral and polycarboxylic acid superplasticizer was explored, and the improvement measures were put forward. The results show that clay minerals affect the dispersion properties of polycarboxylic acid water reducer, and the degree of influence is related to the molecular structure of clay minerals, among which montmorillonite has the most significant effect on polycarboxylic acid water reducer. The polycarboxylic acid water reducer with low acid ether and short side chain has stronger ability to resist clay minerals. Aliphatic water reducer has better anti-clay mineral properties than polycarboxylic acid water reducer. The interaction between clay minerals and polycarboxylic acid water reducer is affected by pH value in solution and ion concentration of inorganic salt, such as sodium silicate, cationic surfactants, anionic surfactants, Clay stabilizer and so on can improve the effect of clay minerals on the properties of polycarboxylic acid superplasticizer. Clay stabilizer can be adsorbed on the interlayer and surface of clay minerals, which reduces the water absorption and expansion of clay minerals and prevents clay minerals from adsorbing polycarboxylic acid water reducer. XRD test confirmed that the side chain of polycarboxylic acid water reducer entered the interlayer of clay minerals. Polycarboxylic acid water reducer may be anchored in the interlayer of clay minerals by hydrogen bond.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU528.042.2
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