Abstract:

Modified polyaspartic acid has been prepared from taurine（SEA）, aspartic acid（ASP） and polysuccinimide（PSI）. The effects of modified polyaspartic acid on the capacities of CaCO₃ scale inhibition,Fe₂O₃dispersion,and corrosion inhibition have been studied. The results show that introducing carboxylic acid group into molecular structure of PASP could greatly improve its scale inhibition rate, but the introducing sulfonic group into molecular structure of PASP could reduce its scale inhibition rate. When the dosage of modified polyaspartic acid with carboxylic acid group is 6 mg/L, its scale inhibition rate is 100%. Introducing sulfonic group into molecular structure of PASP could greatly improve its capacity of dispersion. When its dosage is 10 mg/L, the least diaphaneity of the top liquid on dispersing iron oxide is 40.3%. Introducing carboxylic acid group into molecular structure of PASP could improve its corrosion inhibition rate. When its dosage is 100 mg/L, its corrosion inhibition rate is 35% higher than polyaspartic acid.

Key words: polyaspartic acid, modified polyaspartic acid, scale inhibition and dispersion, corrosion inhibition

摘要：

将聚琥珀酰亚胺（PSI）与天冬氨酸（ASP）、2-氨基乙磺酸（SEA）分别进行反应，对聚天冬氨酸进行改性，并对改性聚天冬氨酸的阻CaCO₃垢、分散Fe₂O₃和缓蚀性能进行了评定。实验结果表明：在PASP分子结构中引入羧基可以提高其阻垢率，而磺酸基的引入则会降低其阻垢率，当引入羧基的改性聚天冬氨酸质量浓度为6 mg/L时，阻垢率达到了100％；磺酸基的引入可以大大提高聚天冬氨酸的分散性能，加药质量浓度为10 mg/L，分散Fe₂O₃时上清液最小透光率为40.3％；羧基的引入有助于缓蚀性能的提高，加药质量浓度为100 mg/L时， 比PASP的缓蚀率提高35％以上。

关键词: 聚天冬氨酸, 改性聚天冬氨酸, 阻垢分散, 缓蚀

CLC Number: 

• TQ085+.412