Synthesis of polyaspartic acid-oxidized starch copolymer and evaluation of its inhibition performance and dispersion capacity

In the study, a novel and highly effective binary scale inhibitor was synthesized by using polysuccinimide and oxidized starch as raw materials by chemical modification, namely polyaspartic acid/oxidized starch copolymer (PASP/OS). The chemical structure of PASP/OS was characterized by Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H NMR). Subsequently, the inhibition efficiency of PASP/OS against CaCO3 and CaSO4 was studied by static tests, while the inhibition performance and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). And the effects of the concentration of PASP/OS, temperature, heating time, pH and Ca2+ concentration against CaCO3 scale were analyzed. In addition, the dispersion capacity of PASP/OS for Fe2O3 was studied, and the inhibition mechanism of PASP/OS was also analyzed. The results showed that PASP/OS was successfully synthesized, and PASP/OS had excellent inhibition performance and dispersion capacity. PASP/OS inhibited scale formation by chelation, dispersion, and crystal distortion.