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AMPS-ALA-HPA三元共聚物是一种分子链中同时含磷酸基、羟基、酰胺基的多官能团聚合物，由于多种官能团的协同效应，共聚物具有较好的阻止Ca~(2+)、Mg~(2+)垢的沉积功能。它还有较好的复配性能，与HEDPA等有机磷酸复合使用，阻垢效果更佳。
AMPS-ALA-HPA terpolymer is a kind of multi-functional polymer containing both phosphate and hydroxyl groups and amido groups in the molecular chain. Due to the synergistic effect of various functional groups, AMPS-ALA- ), Mg ~ (2+) scale deposition function. It also has better compounding performance, and HEDPA and other organic phosphoric acid used in combination, scale inhibition effect is better.