混凝土聚羧酸减水剂引发体系的研究

Study on initiation system in the concrete polycarboxylate water reducer

以异戊烯醇聚氧乙烯醚(TPEG)、丙烯酸(AA)为聚合单体,在过氧化氢(H_2O_2)-酒石酸(TA)氧化还原引发体系引发下,以巯基乙酸(TGA)为链转移剂,通过水溶液聚合制备高性能混凝土聚羧酸减水剂.实验结果表明,H_2O_2-TA氧化还原引发体系制备混凝土聚羧酸减水剂的最佳工艺为:反应温度为30℃,n(H_2O_2):n(TA)为2.6:1,H_2O_2的用量为TPEG质量的0.6%,TGA的用量为TPEG质量的0.7%,AA用量为TPEG质量的13%.该工艺制备的聚羧酸减水剂具有较优的分散性和分散保持性.

In hydrogen peroxide （HzO2）- tartaric acid（TA） redox initiator system, taking isoamyl alcohol ethoxylates （TPEG） and acrylic aeid（AA） as the polymerization of monomers, and thioglycolic acid（TGA） as a chain transfer agent, high performance concrete polycarboxylate is prepared through aqueous solution polymerization. The result shows that H2O2 --TA optimum redox initiator system prepared Polycarboxylate is that reaction temperature is 30℃, n（H2O2 ） ： n （TA）=2.6 ： 1,the amount of H2O2 is 0.6% of TPEG mass,the amount of TGA is 0.7% of TPEG mass, the amount of AA is 13% of TPEG mass. Concrete polycarboxylate prepared in this process has better dispersion and dispersion retention.