丙烯酸共聚物防垢剂对碳酸钙表面电动电位的影响

EFFECT OF ACRYLIC ACID COPOLYMER INHIBITOR ON ZETA POTENTIAL OF CALCIUM CARBONATE

将等量的CaCl_2溶液和Na_2CO_3溶液混合,测定了加入2种不同丙烯酸共聚物防垢剂后CaCO_3生成过程和溶解过程的表面Zeta电位及悬浮液pH值。结果表明,CaCO_3颗粒带有负电荷,生成过程中加入防垢剂后,CaCO_3表面Zeta电位的绝对值明显升高,悬浮液pH值降低的趋势变缓;在溶垢过程中,加入防垢剂制得的CaCO_3表面Zeta电位的绝对值要高于未加防垢剂的情况,随着溶解的进行,悬浮液越接近平衡pH值,这种Zeta电位间的差异越小。从胶体化学的角度看,Zeta电位的这种变化对防垢作用有较大贡献。

In order to study the scale inhibition mechanism of acrylic acid co-polymer inhibitor, an equimolar ratio of CaCl2 and Na2CO3 solution were admixed, the Zeta potential of CaCO3 and the pH value of the suspension were measured in situ during precipitating process and dissolution process. The results showed that the CaCO3 particles were negatively charged. When the acrylic acid co-polymer inhibitors were added during precipitation, the absolute value of CaCO3 Zeta potential increased, and the decreasing extent of the suspension＇s pH value was reduced. In the dissolution process of CaCO3 , the Zeta potentials of CaCO3 and the pH value continuously decreased, and the Zeta potential of CaCO3 is higher than that without scale inhibitor. As CaCO3 was dissolving, the suspension was closer to the equilibrium pH value, and the difference of the Zeta potential of CaCO3 with and without scale inhibitor decreased. contributes greatly to the From the view of colloid chemistry, the changing tread of the Zeta potential scale prevention.