论文部分内容阅读
与传统减水剂相比,聚羧酸减水剂具有减水率和净浆流动度高及坍落度损失小等特性。基于分子结构设计理论和自由基聚合理论,以两种不同分子量的甲代烯丙基聚乙二醇(TPEG)为大单体,马来酸酐(MAn)、甲基丙烯磺酸钠(MAS)、丙烯酰胺(AM)等为小单体,在引发剂过硫酸铵(APS)的作用下多元共聚合成聚羧酸减水剂。系统地研究了反应温度,反应时间,引发剂和单体用量对减水剂净浆流动度、减水率、坍落度等性能的影响,并探讨了聚羧酸减水剂结构与性能之间的关系。结果表明:与普通聚醚类减水剂相比,该聚羧酸高效减水剂具有较高的净浆流动度、减水率、强度等。当减水剂掺量为0.5%时,其净浆流动度达到315mm,而减水率可达35%。
Compared with the traditional water-reducing agent, the polycarboxylate water-reducing agent has the characteristics of water reducing rate, high fluidity of paste and small slump loss. Based on the theory of molecular structure design and the theory of free radical polymerization, two kinds of macromonomers, maleic anhydride (MAn), sodium methallyl sulfonate (MAS) , Acrylamide (AM) as a small monomer, in the initiator of ammonium persulfate (APS) under the influence of multiple polymerization of polycarboxylate superplasticizer. The effects of reaction temperature, reaction time, initiator and monomer content on the fluidity, water reducibility and slump of the superplasticizer were systematically investigated. The structure and properties of the polycarboxylate superplasticizer Relationship between. The results show that compared with ordinary polyether superplasticizer, the polycarboxylate superplasticizer has high fluidity, water reducibility and strength. When the amount of superplasticizer is 0.5%, the fluidity of the paste reaches 315mm while the water-reducing rate can reach 35%.