Conversionof Vinyl Chloride-Vinyl Acetate-Maleic Anhydride Emulsion Copolymerization and Characteristics of Copolymer Latexs
1. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China; 2. Shexian Xinfeng Chemcial Ltd Co, Huangshan, 245200, China
Abstract Vinyl chloride-vinyl acetate-maleic anhydride(VC-VAc-MAH) copolymers were synthesized by batch emulsion copolymerizations, using sodium dodecyl sulfate(SDS) and α-allyl alkylphenol poly(ethyloxide)(10) ammonia sulfate(HS-10) as the emulsifier system, 2,2’-azobis(2-amidinopropane)dinydrochloride(AIBA) as the initiator. The influences of temperature, concentrations of initiator and emulsifier system, feeding monomer composition on the polymerization conversion, stability and particle size of latexes were investigated. It was found that the colloidal stability of copolymer latexes decreased as MAH added. The addition of HS-10 could obviously increase the colloidal stability of copolymer latexes, while slightly decrease the polymerization rate. The polymerization rate increased as the polymerization temperature and the dosage of AIBA increased. The latex was stable and the polymerization rate was great when the dosage of SDS was 3%(mass fraction). The average size of latex particles decreased as the concentration of SDS increased. The polymerization rate decreased as VAc and MAH mass fraction in the feed monomers increased, and the mass fractions of VAc and MAH in the copolymers increased as polymerization conversion increased.
