MA-AA-MAS三元共聚物的制备及其阻垢性能研究

以水为溶剂,过硫酸钾为引发剂,马来酸酐(MA)、丙烯酸(AA)和甲代烯丙基磺酸钠(MAS)为单体合成了三元共聚物.探讨了该共聚物转化率、平均分子质量、阻垢分散效果与单体配比、引发剂用量、反应温度、反应时间之间的关系.结果表明,当单体MA,AA,MAS物质的量比为3.0∶1.0∶0.6,引发剂质量分数为单体总量的14%,反应温度应控制在90℃,反应时间为4 h时,所制得的共聚物性能最佳,单体转化率为90.1%,对CaCO3和Ca3(PO4)2的阻垢率分别达到98.2%和92.1%.

Preparation of the copolymer of MA-AA-MAS and study on its scale inhibiting performance

The water-soluble copolymer of maleic anhydride(MA),acrylic acid(AA) and sodium methyl allylsulfonate(MAS) is prepared by free-radical polymerization.In the preparation process,water is used as solvent and sodium persulfate is used as initiator.The effects of the ratio of three monomers,the dosage of initiator,reaction temperature and reaction time on the conversion rate,mean molecular mass and scale inhibiting result of the copolymer are studied.It is shown that,the copolymer has excellent performance when the molar ratio of MA to AA to MAS is 3.0:1.0:0.6,the dosage of the initiator is 14% of the mass of the monomers,the reaction temperature is 90℃ and the reaction time is 4.0 h.Under the optimum conditions,the conversion rate of the monomers could reach to 90.1%,and the inhibition rates of the copolymer to CaCO_3 and Ca_3(PO_4)_2 could reach to 98.2% and 92.1% respectively.