新型密胺减水剂合成工艺及性能研究

发布时间：2018-06-02 00:24

本文选题：改性密胺减水剂 + 对氨基苯磺酸钠　；参考：《河南师范大学》2013年硕士论文

【摘要】：本文详细研究了目前常用的高效减水剂的分类及其结构特征，密胺减水剂的国内外研究、应用现状，并且介绍了其减水作用机理和目前所面临的问题。本文介绍了密胺减水剂的传统合成方法及各个反应阶段的反应原理，按照减水剂的高性能化设计原理，引入对氨基苯磺酸钠和氨基磺酸盐两种改性单体，以四步合成工艺制备改性密胺减水剂，对比不同原材料投料比和合成工艺参数所制备的密胺减水剂的减水分散效果；分析并总结了影响减水剂合成及分散性能的一系列因素，通过正交试验优化了合成工艺和相关的参数，找出了显著的影响因素，并对各个试验影响因素进行了分析、优化，最终得出最佳的改性密胺减水剂合成工艺。通过严格控制各个影响因素，提高了改性密胺减水剂的羟甲基化率和磺化率，最终提高了其减水分散性能。在低成本化研究中，使用活性单体尿素取代了三聚氰胺单体以降低其生产成本，研究了不同替代量时改性密胺减水剂的减水分散性能，并对其具体的反应原理进行了探讨。试验结果表明，，以四步法合成的对氨基苯磺酸钠改性密胺减水剂（SS-MSM）和氨基磺酸盐改性密胺减水剂（SA-MSM）性能优异。各个反应阶段中，羟甲基化阶段的pH值、反应温度，磺化阶段的pH、反应温度、反应时间，磺化阶段中磺化剂与三聚氰胺的摩尔比，缩合反应中的pH值，缩合时间对减水剂合成性能影响显著。尿素改性的低成本U-MSM合成过程中，尿素的最佳替代量为5%，其减水分散效果没有降低，成本大幅度下降。按照相关的国家标准进行测试，改性的密胺减水剂SS-MSM、SA-MSM的水泥净浆流动度、减水率、水泥适应性和抗压强度比都远远优于市售的传统密胺减水剂（SM）。
[Abstract]:In this paper, the classification and structural characteristics of the commonly used superplasticizer, the research and application of melamine water reducer at home and abroad are studied in detail, and the mechanism of its water-reducing action and the problems it faces are also introduced in this paper. In this paper, the traditional synthesis method of melamine water reducer and the reaction principle of each reaction stage are introduced. According to the high performance design principle of water reducer, two modified monomers, sodium p aminobenzenesulfonate and amino sulfonate, are introduced. The modified melamine water reducer was prepared by four-step synthesis process, and the water reducing dispersion effect of the melamine water reducer prepared by different raw material ratio and synthetic process parameters was compared, and a series of factors affecting the synthesis and dispersion properties of the water reducer were analyzed and summarized. The synthetic process and related parameters were optimized by orthogonal test, and the significant influencing factors were found out, and the influencing factors were analyzed and optimized. Finally, the optimum synthetic process of modified melamine water reducer was obtained. The hydroxy methylation rate and sulfonation rate of the modified melamine water reducer were improved by strictly controlling the influencing factors, and the water reducing dispersion of the modified melamine water reducer was improved. In the low cost research, the melamine monomer was replaced by the active monomer urea to reduce the production cost. The water reducing dispersion of the modified melamine water reducer with different substitution amounts was studied, and the concrete reaction principle was discussed. The results showed that the modified melamine water reducer (SS-MSM) and amino-sulfonate modified melamine superplasticizer (SA-MSM) synthesized by four-step method had excellent properties. The pH value of hydroxy methylation stage, reaction temperature, sulfonation stage pH, reaction temperature, reaction time, the molar ratio of sulfonate to melamine in sulfonation stage, the pH value in condensation reaction, Condensation time has a significant effect on the synthetic properties of water reducer. In the process of synthesis of low cost U-MSM modified by urea, the optimum substitution amount of urea is 5%, but the water reducing and dispersing effect of urea is not reduced, and the cost is greatly reduced. According to the relevant national standards, the modified melamine superplasticizer SS-MSM SA-MSM is much better than the traditional melamine water reducer SS-MSMSA-MSM in cement slurry fluidity, water reducing rate, cement adaptability and compressive strength ratio.
【学位授予单位】：河南师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.042.2

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