阳离子对 HPAM/Cr³⁺弱凝胶性能的影响

Effect of Cations on the Performance of Polyacrylamide/Cr³⁺Weak Gel

桑海波 蒲春生 张 磊 赵 青 张 兵

SANG Haibo PU Chunsheng ZHANG Lei ZHAO Qing ZHANG Bing

为揭示相同价态阳离子对弱凝胶成胶性能的影响规律， 研究了 Mg2+、 Ca2+、 Na+、 K+四种常见阳离子对部分水解聚丙烯酰胺（HPAM） /Cr3+弱凝胶成胶黏度和稳定性的影响。结果表明， 阳离子浓度过低或过高均会抑制HPAM/Cr+体系的成胶； HPAM质量浓度为3 g/L时， 利于HPAM成胶的单一阳离子浓度适宜范围分别为Mg2+ 0.4～9 g/L、 Ca2+ 1.2～18 g/L、 Na+ 9～30 g/L、 K+ 16～55 g/L； 阳离子半径越小、 对凝胶成胶黏度和稳定性的影响越大； 四种阳离子对弱凝胶成胶黏度的影响顺序为Mg2+>Ca2+>Na+>K+， 对弱凝胶稳定性的影响顺序为Mg2+>Ca2+、 Na+>K+。图3参12

In order to reveal the influence of cations with same valence on gelling properties of weak gel，the influence of four common cations including Mg2+、 Ca2+、 Na+and K+ on gelling viscosity and stability of partially hydrolyzed polyacrylamide （HPAM） /Cr3+ weak gel was studied. The results showed that both the very low and high concentration of cations suppressed the gelation of HPAM/Cr3+ weak gel. When the mass concentration of HPAM was 3 g/L，the proper mass concentration range of Mg2+，Ca2+，Na+ and K+ that was conducive to form gel was 0.4—9 g/L，1.2—18 g/L，9—30 g/L and 16—55 g/L，respectively. The smaller cation radius，the more serious influence on gelling viscosity and stability of gel was. The four cations were arranged according to their influence on gelling viscosity of weak gel in following order: Mg2+>Ca2+>Na+>K+，and according to the stability of weak gel in following order: Mg2+>Ca2+,Na+>K+.

10.19346/j.cnki.1000-4092.2016.06.012