粘土矿物对聚羧酸减水剂性能的影响及机理研究
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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。
The effects of clay minerals on the properties of polycarboxylate superplasticizer were studied,the mechanism of the interaction of clay minerals with polycarboxylate superplasticizer wasexplored, and the measures for improvement were proposed. The research showed that clay mineralsaffected the dispersion performance of polycarboxylate superplasticizer, the degree of impact wasrelated to the molecular structure of the clay minerals itself, and the impact of montmorillonite onpolycarboxylate superplasticizer was the most significant. The polycarboxylate superplasticizer withlow acid ether ratio and short side chain exhibited stronger capability of resistance to clay minerals.Aliphatics water-reduing agent was superior to polycarboxylate superplasticizer in resistance to clayminerals. The interaction of clay minerals with polycarboxylate superplasticizer was affected bysolution pH and inorganic salt ion concentration.Sodium silicate, cationic surfactant, anionic surfaceactive agent and clay stabilizer played a great role in the improvement of the impact of clay mineralson the properties of polycarboxylate superplasticizer. Clay stabilizer could be adsorbed into clayminerals interlayer of clay mineral surface, decrease the adsorption of water and swelling andprevent clay minerals from adsorption on polycarboxylate superplasticizer. XRD tests confirmed thatthe side chain of polycarboxylate superplasticizer entered the layers of clay minerals, and wasanchored in the layers of clay minerals through hydrogen bonding.
The effects of clay minerals on the properties of polycarboxylate superplasticizer were studied,the mechanism of the interaction of clay minerals with polycarboxylate superplasticizer wasexplored, and the measures for improvement were proposed. The research showed that clay mineralsaffected the dispersion performance of polycarboxylate superplasticizer, the degree of impact wasrelated to the molecular structure of the clay minerals itself, and the impact of montmorillonite onpolycarboxylate superplasticizer was the most significant. The polycarboxylate superplasticizer withlow acid ether ratio and short side chain exhibited stronger capability of resistance to clay minerals.Aliphatics water-reduing agent was superior to polycarboxylate superplasticizer in resistance to clayminerals. The interaction of clay minerals with polycarboxylate superplasticizer was affected bysolution pH and inorganic salt ion concentration.Sodium silicate, cationic surfactant, anionic surfaceactive agent and clay stabilizer played a great role in the improvement of the impact of clay mineralson the properties of polycarboxylate superplasticizer. Clay stabilizer could be adsorbed into clayminerals interlayer of clay mineral surface, decrease the adsorption of water and swelling andprevent clay minerals from adsorption on polycarboxylate superplasticizer. XRD tests confirmed thatthe side chain of polycarboxylate superplasticizer entered the layers of clay minerals, and wasanchored in the layers of clay minerals through hydrogen bonding.
引文
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