摘要：

以L-天冬氨酸为原料, 采用热缩聚合、液相聚合和改性聚合三种方法合成了热缩聚天冬氨酸。采用红外光谱与X光衍射技术研究了反应物预处理前后的特征, 对聚合工艺条件进行了优化和对比, 对合成产物进行了结构表征, 并对产品阻垢性能进行了对比分析。结果表明, 热缩聚合、液相聚合与改性聚合工艺反应温度分别为210、180、180℃;反应时间分别为3.0、1.3、1.0 h;催化剂最佳化学计量数分别为0.12、0.18、0.08。热缩聚合与液相聚合产品的阻垢性能相当, 改性聚合产品的阻垢率约提高6.8%。说明改性聚合是一种较先进的聚天冬氨酸的合成方法。

关键词: 聚天冬氨酸, 阻垢性能, 聚合, 合成

Abstract:

L-aspartic acid has been used as raw material and polyaspartic acid has been synthesized by 3 methods: pyrocondensation polymerization, liquid phase polymerization and modification polymerization. The characteristics of the reactants before and after the pretreatment are investigated by using infrared spectrum and X-ray diffraction technique. The reaction conditions are optimized and the performance of synthesized product are analyzed. The results show that the reaction temperatures of pyrocondensation polymerization, polymerization in liquid phase and modification polymerization are 210, 180, 180℃ respectively, reaction time accordingly 3.0, 1.3, 1.0 h respectively, the stoichiometric number of catalyst to L-aspartic acid 0.12, 0.18, 0.08 respectively. The inhibiting performances of pyrocondensation polymerization and liquid phase polymerization products are corresponding. The inhibiting performance of modification polymerization product is the best, having increased about 6.8%. It is pointed out that modification polymerization is an advanced synthesis method of polyaspartic acid.

Key words: polyaspartic acid, scale inhibition performance, polymerization, synthesis

中图分类号: 

• TQ085+.412