Stearic Acid → Zinc acrylate

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To a 4000 liter jacketed stainless steel reactor, at room temperature, were fed successively toluene (1472 kg), zinc oxide (310 kg, 99% purity, 3.77 kmol) and stearic acid (56.0 kg, 0.197 kmol). Then, the temperature was raised to 55±5° C. To the reactor was added dropwise acrylic acid (506 kg, 7.02 kmol) over 2.5 hours, and continued the stirring while keeping at this temperature for additional 2 hours in order to complete the reaction. To this reaction mixture was added Sinopol 1536 (2.0 kg, HLB 12.8, comprising mainly polyoxyethylene alkyl ether). After stirring for additional 30 minutes, the resulting cream-like mixture was fed into a paddle dryer for distilling off toluene and water under reduced pressure, and pulverizing the powder. A modified zinc acrylate as a white fine powder was thus obtained (780 kg, 96.7% yield). Moisture content is<0.5 wt %, acryl content is 56.1 wt % and an analyzed ash content is 38 wt %. IR spectrum (KBr): λ 2917, 2848, 1644, 1575, 1522, 1447, 1433, 1373, 1365, 1274, 1067, 974 cm−1. After discharging the material, no cluster stuck on the blade in the dryer was observed, and no cake was detected in the powder.

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