Stearic Acid → Zinc acrylate

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To a 4000 liter jacketed stainless steel reactor, at room temperature, were fed toluene (1591 kg, moisture content of 3.7%), zinc oxide (403.0 kg, 94.5% purity, 4.68 kmol) and stearic acid (65.7 kg, 0.23 kmol). Then, the temperature was raised to 48±5° C. To the reactor was added dropwise acrylic acid (631 kg, 8.76 kmol) over 2.5 hours, and continued the stirring while keeping at this temperature for additional 2 hours in order to complete the reaction. The pH value of this solution is about 5. To this reaction mixture was added Sinopol 1536 (2.0 kg, HLB 12.8, comprising mainly polyoxyethylene octadecyl 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 (947.8 kg, 94.6% yield). Moisture content<0.5 wt %, acryl content is 52 wt % and ash content is 36.3 wt %, IR spectrum (KBr): λ 2917, 2848, 1651, 1603, 1537, 1443, 1372, 1276, 1069, 983 cm−1. 99% of its particles have a particle size of<44 μm as shown in the following data determined by a particle size analyzer (model FRITSCH PARTICLE SIZER ANALYSETTE 22) over the range of 0.31 μm to 44.85 μm:

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