The Study On Ammonium Acrylate Solution Polymerization And Inverse Microemulsion Polymerization

Abstract:Based on its rapid dissolution, covenient to use and excellent performance in red mud setting, miroemulsion flocculant was widely used in the alumina industry. In this paper, the ammonium acrylate solution polymerization was studied, and then the ammonium acrylate inverse microemulsion polymerization was studied. The main contents were as follows:(1)The ammonium acrylate solution polymerization was studied by univarate method, and its optimum conditions were determined as follows: monomer concentration50%, V50initiator amount0.03%, EDTA amount0.03%, NaCl amount0.6%, isopropanol amount0.7%, polymerization temperature30℃, polymerization time3h, polymerizing under high purity nitrogen discharge oxygen conditions. Under these conditions, ammonium polyacrylate hydrosol conversion rate was close to100%, solid content was50%, molecular weight was19.05million and it had a good red mud settling performance and dissolution property.(2) Ammonium acrylate inverse microemulsion sytem was studied. The best formulation of microemulsion sytem was obtained by measuring the electrical conductivity and the stability, observing the appearance and Tyndall phenomena of the microemulsion. Optimum conditions were as followed:the system of Isopar M/Span80/OP-10/ammonium acrylate solution was choosed, it contents emulsifier16.71%, HLB8.75, ammonium acrylate concentration64%, water phase amount27.58%, oil/water ratio was2.02.(3)Various factors influence on inverse microemulsion polymerization was studied, and the optimum conditions were determined as follows:V50amount0.15%, EDTA amount0.3%, polymerization temperature45℃, polymerization time6h, polymerizing under high purity nitrogen discharge oxygen conditions. Under these conditions, ammonium polyacrylate microemulsion product conversion rate was97.02%, solid content was17.12%, molecular weight was12.88million. The microemulsion was uniform and stable, it did not turn into two layers after long-term placement and had a good red mud settling performance.