Study on Synthesis of Cationic Water in Water Polyacrylamide Emulsion Strength Agent

Emulsion copolymerization of acrylamide (AM) and cationic monomer DMC (methyl acrylacyl oxyethyl trimethyl ammonium chloride) was studied. A series of cationic polyacrylamide (CPAM) emulsion were synthesized using Water in water emulsion polymerization. Influence of polymerization conditions such as cationic monomer (DMC) ratio, reaction time, the initiator dosage on synthetic product strengthening effect to paper pulp was studied. It was showed that the CPAM emulsion optimal synthetic conditions was that AM monomer second adding amount was 60% AM total amount, ammonium persulfate initiator and sodium hydrogen sulfite initiator dosage was 0.138g and 0.03g respectively, mass ratio of DMC and AM was 15:85, reaction time was 7 hours. When the dosage of CPAM emulsion was 1.0% to absolute dry bleached wheat straw pulp, distinct strengthening effect was acquired, tensile index and tearing index of handsheet was increased by 27.2% and 26.8% respectively.