改性聚天冬氨酸的合成及性能

在水体系下合成了含有羟基、羧基以及磺酸基多个官能团的新型、无磷、无氮、环保型阻垢剂———改性聚天冬氨酸的共聚物。探讨出最佳合成条件为:n(马来酸酐)∶n(氨)∶n(柠檬酸)∶n(2-氨基乙磺酸)=1∶2.8∶0.12∶0.075,反应时间3 h,热缩聚温度190℃,聚合时间1 h。对共聚物的结构进行表征,测定产品对磷酸钙垢的阻垢性能,结果表明,当投加量达到24 mg/L时,阻垢率可达82.9%,阻垢效果明显优于传统阻垢剂。

Synthesis and Performance of Modified Polyaspartic Acid

A new nitrogen-free and phosphorus-free scale-inhibitor,modified polyaspartic acid,was synthesized in the water system.It contains hydroxyl,sulfonic acid groups and carboxyl groups.The optimum synthetic conditions were ascertained as follows:the mole ratio of n(maleic anhydride)∶ n(ammonia)∶ n(citric acid)∶ n(2-amino-ethanesulfonic acid) is 1∶ 2.8∶ 0.12∶ 0.075;reaction time is 3 hours;the thermal polycondensation temperature is 190 ℃;the polymerization time is 1 h.The product′s structure was characterized.A conclusion is drawn that the scale inhibition rate of the agent is 82.9% when the dosage reaches 24 mg/L.The new antiscalant is significantly better than the traditional productions.