PREPARATION OF CROSS-LINKING AND HYDROPHOBICALLY ASSOCIATING CPAM AS RETENTION AID

"Water-in-water" emulsions of cross-linking and hydrophobically associating cationic polyacrylamide (CHCPAM) with cationic groups (methacrylatoethyl trimethyl ammonium chloride, DMC) hydrophobic groups (octadecyl methacrylate, OA) and cross-linking groups (N, N'-methylene bisacrylamide, MBA) were prepared by dispersion polymerization. The structure of the copolymer was confirmed by FTIR and (HNMR)-H-1. The prepared "water-in-water" emulsions possessed high solid content, low viscosity, good stability and water solubility. Appropriate concentrations of OA and MBA for stable dispersion system are in the scope of 0-0.1 wt% and 0-50 ppm, respectively. They have comparative retention rate, better ability of anti-shearing and better salt resistance compared to commercial CPAM. Cross-linking structure and hydrophobic association of CHCPAM was found mainly contribute to the ability of anti-shearing and salt resistance, respectively.