范文编号:CL022 范文字数:10200,页数:21 摘 要:为了获得具有较好分散力和保持能力的聚羧酸盐高效减水剂,研究了其制备方法。首先通过酯化反应和聚合反应,以丙烯酸、甲氧基聚乙二醇、马来酸酐和甲基丙烯磺酸钠为主要原料,共聚合成得到聚羧酸盐高效减水剂。对影响减水剂分散性的因素进行了分析。结果表明:改变单体、反应温度、引发剂量、链转移剂、反应过程工艺等因素的不同,造成聚羧酸盐高效减水剂的分散力和保持能力都会不同。如以MPEG1300系列为单体制得的减水剂明显比MPEG1000的好;反应温度65℃比80℃合适;添加链转移剂能明显改善聚羧酸盐高效减水剂的性能;MPEG2000单体以一次性投料的方式比滴加方式更能提高产品性能;合适的引发剂的用量对聚羧酸盐高效减水剂的性能影响很大。 Abstract: In order to obtain polycarboxylate superplasticizer with high dispersion and fluid—holding property,the synthesis method of polycarboxylate superplasticizer was studied.The polycarboxylate superplasticizer was synthesized by esterification reaction and polymerization using acrylic acid,methoxyl-polyethylene glycol,maleic anhydride and sodium methallyl sulfonate as raw materials.Some factors influencing dispersion of the product were analyzed .The results show that the change of factor of monomer, the reaction temperature, the initiation dosage, the chain transfer medicinal preparation, reaction process and so on, results in the different of dispersion and fluid—holding property of polycarboxylate superplasticizer. Compared to MPEG1000, the MPEG1300 series polycarboxylate superplasticizer obviously is good; Reaction temperature 65℃ is appropriate compared to 80℃; The increase of chain transfer agent can obviously improve polycarboxylate superplasticizer; The MPEG2000 monomer can enhance the product performance by the way compared to the way; the influence of the appropriate initiator amount used to improve polycarboxylate superplasticizer is very big. 目 录 聚羧酸盐混凝土减水剂的合成相关范文 |
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