Research on Synthesis and Behavior of Polyaspartic acid ——A New Type Polymeric Scale Inhibitors

The synthesis,thermal stability and scale inhibitio n behavior of polyaspartic acid,a new type water treatment agent,is discussed in this paper.Several conclusions are drawn.The process of synthesizing polya spartic acid from L-aspartic acid is simple.The raw material,synt hetic process and application of polyaspartic acid all could do no harm to environmen t and body.The polyaspartic acid can be applied widely in high temperature water system due to its excellent thermal stability.The polyaspartic acid with molecu lar weight of 400 0 shows the best calcium carbonate inhibition.Polyaspartic acid can achieve idea l calcium carbonate inhibition behavior even at low dosages.The calcium carbonat e inhibition rate is up to 88% at the dosages of 0.2 mg/L and 100% at 2.0 mg/L .The decreasing tendency of inhibition rate with increasing Ca 2+ concentration could be slowed down by increasing polyaspartic acid concentration,and so poly aspartic acid is perfect to be applied in high Ca 2+ concentration water sy stem.