STUDY ON SYNTHESIS OF AMPHOTERIC POLYACRYLAMIDE IN INVERSE EMULSION

摘要

Amphoteric polyacrylamide was prepared first by the copolymerization of acrylamide with sodium-acrylate and then through Mannich reaction. The copolymerization was carried out with a re- dox initiation system using the method of inverse emulsion polymerization. In this paper the reaction conditions and factors that affect emulsion stability were studied. Experiments show that a stable latex can be obtained under the following conditions: anionic degree is five percent, the ratio among acry- lamide, formaldehyde and dimethylamine is 1:1:1.2, reaction temperature is 45℃, reaction time lasts four hours, and pH equals 5.0. The amphoteric copolymer has a higher molecular weight and cationic degree, so it is an ideal filler retention and drainage aid in paper making.