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<p>Polyaspartic acid (PASP) is considered an environmentally friendly scale inhibitor because of its phosphorus-free nature and excellent biodegradability. However, its scale inhibition performance against calcium sulfate (CaSO<sub>4</sub>) is limited by the presence of relatively few functional groups. In this study, a novel modified polymer scale inhibitor (Met-MPEA-SA-PASP) was successfully synthesized by grafting methionine (Met), 2-methoxyphenoxyethylamine (MPEA), and sulfamic acid (SA) onto the PASP backbone via a ring-opening grafting reaction. Static scale inhibition tests demonstrated that the modified polymer exhibits a scale inhibition efficiency exceeding 99% against CaSO<sub>4</sub> at a low dosage of 10&#xa0;mg/L, outperforming unmodified PASP. Moreover, it maintained stable inhibition performance across a temperature range of 50–80&#xa0;°C, pH 6–9, and calcium ion concentrations of 1000–3000&#xa0;mg/L. SEM and XRD analyses revealed that the polymer effectively altered the crystal morphology and structure of CaSO<sub>4</sub> scale, thereby inhibiting its regular growth. The grafted functional groups, including carboxyl (-COOH), sulfonic acid (-SO<sub>3</sub>H), and amino (-NH<sub>2</sub>) groups, synergistically enhance the chelation and dispersion capabilities of the inhibitor. This work provides an efficient strategy for CaSO<sub>4</sub> scale inhibition derived from environmentally friendly precursors.</p>

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Synthesis and performance evaluation of a carboxyl-, sulfonic-, and amino-functionalized polyaspartic acid polymer for calcium sulfate scale inhibition

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Ruijing Feng,
  • Kang Wang,
  • Jiahui Liu,
  • Jiaqing Yu,
  • Wenwen Zhao,
  • Eryang Ming,
  • Anchang Xu,
  • Xiaoqi Wang,
  • Yehan Wang,
  • Fan Yang

摘要

Polyaspartic acid (PASP) is considered an environmentally friendly scale inhibitor because of its phosphorus-free nature and excellent biodegradability. However, its scale inhibition performance against calcium sulfate (CaSO4) is limited by the presence of relatively few functional groups. In this study, a novel modified polymer scale inhibitor (Met-MPEA-SA-PASP) was successfully synthesized by grafting methionine (Met), 2-methoxyphenoxyethylamine (MPEA), and sulfamic acid (SA) onto the PASP backbone via a ring-opening grafting reaction. Static scale inhibition tests demonstrated that the modified polymer exhibits a scale inhibition efficiency exceeding 99% against CaSO4 at a low dosage of 10 mg/L, outperforming unmodified PASP. Moreover, it maintained stable inhibition performance across a temperature range of 50–80 °C, pH 6–9, and calcium ion concentrations of 1000–3000 mg/L. SEM and XRD analyses revealed that the polymer effectively altered the crystal morphology and structure of CaSO4 scale, thereby inhibiting its regular growth. The grafted functional groups, including carboxyl (-COOH), sulfonic acid (-SO3H), and amino (-NH2) groups, synergistically enhance the chelation and dispersion capabilities of the inhibitor. This work provides an efficient strategy for CaSO4 scale inhibition derived from environmentally friendly precursors.