Abstract:

Polyaspartic acid has been prepared by thermal polymerization of L-aspartic acid, which can be hydrolyzed to polymer. The relative molecular weights (Mw)are measured with GPC. Several conclusions have been drawn. The calcium sulphate inhibition rate is up to 90%, as the dosages of polyaspartic acid reaching 4 mg/L. It is better than that of polymaleic and polyacrylic acid. The amount of the combination of polyaspartic acid and sodium citrate is 5 mg/L, the inhibition rate reaches 90%.And that of polyaspartic acid and sodium tripoly phosphate is up to 88%.Polyaspartic acid and its combinations are perfect to be applied in high temperature water system.

Key words: polyaspartic acid, combinations, calcium sulphate, scale-inhibition

摘要：

以L-天冬氨酸为原料，热聚合成聚天冬氨酸酐，水解得到聚天冬氨酸的钠盐．采用凝胶色谱法(GPC)测定了聚天冬氨酸的相对分子质量．研究了聚天冬氨酸及其复配物的阻CaSO₄垢性能．实验表明:聚天冬氨酸在投加质量浓度为4mg/L时，阻垢率达到90%，优于常用的阻垢剂聚马来酸和聚丙烯酸．聚天冬氨酸与三聚磷酸钠的复配物在投加质量浓度为5mg/L时，阻垢率达到90%，与柠檬酸三钠的复配物的阻垢率达到88%．聚天冬氨酸及其复配物均具有一定的耐温性能，且聚天冬氨酸优于其复配物．

关键词: 聚天冬氨酸, 复配物, 硫酸钙, 阻垢性能

CLC Number: 

• TQ085+.4