酯类聚羧酸减水剂的微波制备与性能表征
发布时间：2018-10-05 12:45
【摘要】：利用微波技术清洁、高效、靶向等特点,分别采用微波合成法和常规油浴法,以聚乙二醇单甲醚(MPEG),甲基丙烯酸(MAA)等原材料制备甲氧基聚乙二醇甲基丙烯酸酯(MPEGMAA),并进一步聚合成酯类聚羧酸减水剂进行性能对比.分别研究了酸醇比、催化剂用量、阻聚剂用量、反应时间、酯化温度以及微波功率对酯化大单体酯化率的影响规律,并基于微波合成法得出最优配比与工艺方案:n(MAA)∶n(MPEG)=5.0∶1.0,催化剂用量为MPEG质量的4.5%,阻聚剂用量为MAA质量的0.28%,酯化温度为120℃,酯化时间为100min,微波功率为1 000W.微波合成法的酯化率为93.47%,是常规油浴法的1.14倍,反应速率为常规油浴法的4.8倍.通过水泥净浆流动度试验、流变学研究以及红外光谱分析得出,微波合成法更有利于酯化大单体酯键的形成,且合成的酯类聚羧酸减水剂分散性及分散保持性更优.
[Abstract]:Microwave synthesis method and conventional oil bath method were used to make use of the characteristics of microwave cleaning, high efficiency, targeting and so on. Methoxy poly (ethylene glycol) methacrylate (MPEGMAA),) was prepared from polyethylene glycol monomethyl ether (MPEG),) methacrylate (MAA) and further polymerized to ester polycarboxylic acid superplasticizer. The effects of the ratio of acid to alcohol, the amount of catalyst, the amount of inhibitor, the reaction time, the temperature of esterification and microwave power on the esterification rate of macromonomer were studied. Based on the method of microwave synthesis, the optimum ratio and technological scheme of: n (MAA): n (MPEG) 5.0: 1.0, the amount of catalyst 4.5% of the mass of MPEG, the amount of inhibitor 0.28% of the mass of MAA, the esterification temperature 120 鈩，
本文编号：2253433
[Abstract]:Microwave synthesis method and conventional oil bath method were used to make use of the characteristics of microwave cleaning, high efficiency, targeting and so on. Methoxy poly (ethylene glycol) methacrylate (MPEGMAA),) was prepared from polyethylene glycol monomethyl ether (MPEG),) methacrylate (MAA) and further polymerized to ester polycarboxylic acid superplasticizer. The effects of the ratio of acid to alcohol, the amount of catalyst, the amount of inhibitor, the reaction time, the temperature of esterification and microwave power on the esterification rate of macromonomer were studied. Based on the method of microwave synthesis, the optimum ratio and technological scheme of: n (MAA): n (MPEG) 5.0: 1.0, the amount of catalyst 4.5% of the mass of MPEG, the amount of inhibitor 0.28% of the mass of MAA, the esterification temperature 120 鈩，
本文编号：2253433
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