Emulsion Polyacrylamide The Products Preparation Process

In this paper, in orde to improve the stability of inverse emulsion and latex polyacrylamide, nonionic (PAM) and cationic polyacrylamide (CPAM) products with high molecular weight and stability emulsion were synthesized via inverse emulsion polymerization combined with ultrasonic emulsification method. On this basis, amphoteric polyacrylamide emulsion (APAM) was prepared by the means of hydrolization of cationic polyacrylamide using the alkali as hydrolytic reagent. The products were characterized by SEM, FTIR and SDTA-TGA. The results showed that polyacrylamide obtained has excellent emulsion stability, thermal stability and flocculent property. The optimum reaction conditions of ultrasonic emulsification process were studied.The proper continuous ultrasonic time of preparing inverse emulsion was 4 minute. In the synthesis process of nonionic polyacrylamide, the optimum conditions were as follows:the amount of initiator 0.2%o, reaction temperature 50℃, HLB=7, amount of emulsifier 6%, mass fraction of monomer 35%, mass ratio of oil to water 1.0:1.0, Urea 5% and reaction time 4h. While in the synthesis process of cationic polyacrylamide CPAM, the optimum conditions were different:reaction temperature 60℃, amount of initiator V-50 1.6‰, emulsifier 8%, HLB=7, mass fraction of monomer 35%, mass ratio of oil to water 1.1:1.0, cationic degree 15%, and reaction time 4h. During the hydrolization course of CPAM, Na2CO3 was added as hydrolytic reagent, the reaction conditions were controlled as:temperature 50℃, reaction time 2h, mass ratio of Na2CO3 to CPAM 0.3:1.0. Under the above conditions, the excellent polyacrylamide products were obtained. Molecular weight, cation and degree of hydrolysis were as follows:PAM 8.81×106; CPAM 3.53×106,15%;APAM1.2×106,15%,27.34%.