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用柠檬酸锆交联部分水解聚丙烯酰胺配成一种缓交联体系,在交联过程中,柠檬酸锆可大大延缓部分水解聚丙烯酰胺的交联速度.试验证明,体系的粘度随时间的增加而逐渐增加,当体系的粘度升至3×10_3mPa·s时,需要174h.研究了该体系中柠檬酸铬的制备方法以及部分水解聚丙烯酰胺(HPAM)最佳分子量、水解度及该体系中HPAM和Zr~4+的浓度及体系pH值的选择.分析了体系的pH值、Zr~(4+)与部分水解聚丙烯酰胺配比、温度及水的矿化度对交联反应速度的影响.
Zirconium citrate can greatly delay the cross-linking rate of partially hydrolyzed polyacrylamide during the cross-linking process by partially hydrolyzing polyacrylamide with zirconium citrate.Experiments show that the viscosity of the system increases with time The viscosity of the system increased to 3 × 10_3mPa · s, which required 174h.The preparation method of chromium citrate and the optimum molecular weight and degree of hydrolysis of the partially hydrolyzed polyacrylamide (HPAM) The concentration of HPAM and Zr ~ 4 + in the system and the choice of the pH value of the system, the influence of the pH, the ratio of Zr ~ (4 +) to the partially hydrolyzed polyacrylamide, the temperature and the salinity of water on the crosslinking reaction The impact of speed.