Sodium Bicarbonate/14 "Aerosol" OT (1-5% based on monomer)/50-250 Water/4970 Ammonium Persulfate/10 Styrene/5000
配制方法:
A solution of ammonium persulfate is prepared first by dissolving the 10 parts by weight of ammonium persulfate catalyst in 120 parts of the ion exchange water. The emulsifier, sodium bicarbonate, and the remainder of the water are then charged to the kettle and heated to 90 C. Ten parts by weight of ammonium persulfate solution is added to the kettle as the monomer addition is begun. Monomer is added slowly in a thin stream, above the surface of the batch, at a rate of about 0.66% of charge per min or an addition time of 3 h. At the start of every 500 parts by weight addition of monomer, another 10 parts by weight of ammonium persulfate solution is added, or the catalyst solution may be added continuously (dropwise) during the addition of the ammonium persulfate solution is charged. Heating is continued for 15-20 min after addition of monomer has been completed. The mixture may be steam-stripped to remove any residual monomer. The complete process requires about 5 h, and a 95-99% conversion to a water-t
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