改性聚天冬氨酸的合成及性能

Synthesis and Performance of Modified Polyaspartic Acid

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。

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.