Title: SOME PROBLEMS IN THE PREPARATION OF POLYACRYLIC ACID THICKENER BY INVERSE EMULSION POLYMERIZATION
Abstract: Thickener was prepared by inverse emulsion polymerization of ammonium acrylate using an amphiphilic copolymer as steric stabilizer, Span 80 as emulsifier and methylene bisacrylamide as crosslinker. The effects of amphiphilic copolymer with different structures, different types initiators, acrylamide as comonomer and diffferent chain transfer agents on the polymerization and the properties of thickener were studied. The results showed that copolymer of dodecyl methacrylate and methacrylic acid can be used as a good steric stabilizer. Two redox initiators, namely, benzoyl peroxide dimethylaniline and tertiary butyl hydrogen peroxide sodium pyrosulfite can initiate the inverse emulsion polymerization at 35 ℃ smoothly and the products obtained after dispersed in water to 1.5% concentration showed a viscosity of 9.3 ×10 4 and 8.7 ×10 4 mPa·s, respectively. When ammonium acrylate acrylate was copolymerization with 15% acrylamide, the product obtained exhibited a lower viscosity, but higher anti electrolyte ability. Formic acid can play a role of chain transfer agent.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 1
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