水溶性酚醛交联聚丙烯酰胺凝胶体系耐盐老化性研究

Study on salt resistance of resol crosslinking partial hydrolytic polyacrylamide gel

采用动态光散射、原子吸收光谱等方法对水溶性酚醛交联部分水解聚丙烯酰胺（Resol—HPAM）凝胶体系的耐盐老化性进行了研究，测定了Ca^2＋，Mg^2＋，Na^＋环境中凝胶的黏度、离子络合浓度及流体力学半径的变化情况。结果表明，与HPAM凝胶相比，Resol—HPAM凝胶的高温耐盐性有所提高；盐离子对凝胶体系稳定性的影响由强至弱依次为Ca^2＋，Mg^2＋，Na^＋；老化时间为5～20d时，Resol—HPAM凝胶与Mg^2＋的络合程度在14％～26％内变化，与Ca^2＋的络合程度则在22％-40％内变化；丙烯酰胺-丙烯酸（AM—AA）低相对分子质量齐聚物可使Resol—HPAM凝胶的离子络合程度降低至约10％。

The salt resistance of resol crosslinking partial hydrolytic polyacrylamide （ Resol - HPAM） was studied by dynamic light scattering and atomic absorption spectrometry. The viscosity of Resol - HPAM gel, the hydrodynamic radius and ion complex concentration were measured in the presence of Ca^2＋ , Mg^2＋ , Na^＋. The results showed that compared with HPAM gel, the salt resistance of Resol - HPAM was improved. The stabilization of the gel system decreased in the complex order of Ca^2＋ ,Mg^2＋ concentration with ,Na^＋ . The Mg^2＋ Resol - HPAM changed from 14% concentration from to 26% and Ca^2＋ ion complex 22% to 40% when the aging time was 5 - 20 d. After the acrylamide - acrylic acid（AM- AA） oligomer with low relative molecular mass was added,the ion complexation concentration of Resol- HPAM gel could reduce to 10%.