【摘要】：研究了粘土礦物對聚羧酸減水劑性能的影響規(guī)律，探索了粘土礦物與聚羧酸減水劑的相互作用機(jī)理，，并提出改善措施。研究表明：粘土礦物影響聚羧酸減水劑的分散性能，其影響程度與粘土礦物自身的分子結(jié)構(gòu)有關(guān)，其中蒙脫土對聚羧酸減水劑的影響最為顯著。酸醚比較低及側(cè)鏈較短的聚羧酸減水劑抗粘土礦物的能力更強(qiáng)。脂肪族減水劑相對于聚羧酸減水劑具有較好的抗粘土礦物性能。粘土礦物與聚羧酸減水劑的相互作用受溶液中pH值及無機(jī)鹽的離子濃度的影響，硅酸鈉、陽離子表面活性劑、陰離子表面活性劑、粘土穩(wěn)定劑等具有較好地改善粘土礦物對聚羧酸減水劑性能影響的作用。粘土穩(wěn)定劑可以吸附在粘土礦物的層間和表面，降低了粘土礦物吸水膨脹，阻止粘土礦物吸附聚羧酸減水劑。XRD測試證實(shí)了聚羧酸減水劑的側(cè)鏈進(jìn)入到了粘土礦物的層間，聚羧酸減水劑可能通過氫鍵作用錨固在粘土礦物的層間。
[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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)（北京）
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528.042.2

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