聚天冬氨酸衍生物的合成及阻垢性能

利用天冬氨酸热缩聚产物聚琥珀酰亚胺（PSI）和天冬氨酸（ASP）合成了一种聚天冬氨酸衍生物。研究了聚琥珀酰亚胺与天冬氨酸不同比例时的接枝率，考察了聚天冬氨酸衍生物的阻垢性能。利用红外光谱对聚天冬氨酸衍生物的结构进行了表征，利用扫描电子显微镜对CaCO₃晶形进行了观察和分析。实验结果表明：当PSI与ASP的摩尔比为1∶1.8时，产物的接枝率最高，达到了66.45％，其阻垢效果也最好。当Ca²⁺质量浓度为400 mg•L^-1、HCO^-₃质量浓度为800 mg•L^-1、聚天冬氨酸衍生物用量为6 mg•L^-1时，阻垢率达到100％。聚天冬氨酸衍生物对CaCO₃有晶格扭曲和分散作用。

Synthesis of polyaspartic acid derivative and its characteristics in scale inhibition

Polyaspartic acid derivative was prepared from aspartic acid（ASP）and polysuccinimide（PSI）that was the thermal condensation polymer of ASP.Its grafting ratio was examined by measuring the residual ASP.Effect of the mole ratio of PSI to ASP on grafting ratio and the scale inhibition properties of PASP-ASP were studied.The product structure was characterized by using FTIR.Calcium carbonate crystals in the scale samples were observed with SEM.The highest grafting ratio of PASP-ASP up to 66.45% was achieved when the mole ratio of PSI to ASP was 1∶1.8.Under the concentrations of Ca²⁺ with 400 mg•L^-1，HCO^-₃ with 800 mg•L^-1 and PASP-ASP with 6 mg•L^-1，the scale inhibition efficiency of PASP-ASP was up to 100%.Polyaspartic acid derivative could make the calcium carbonate crystallite more distortive and more dispersive.