反应详情

A water-in-oil emulsion of an acrylamide/acrylic acid copolymer is prepared by dissolving 125 g of acrylamide and 54 g of acrylic acid in 100 g of water. The pH of the resulting aqueous solution is adjusted to 6.5 by the addition of a 50 percent aqueous solution of NaOH. To this solution is added 0.04 g of the pentasodium salt of diethylenetriaminepentaacetic acid and 2 g of a polyethylene glycol ether of a secondary alcohol sold by Union Carbide under the trade name Tergitol 15-S-9. The total weight of this aqueous phase is adjusted to 490 g by the addition of water. This aqueous phase is then dispersed in an oil phase which contains 182 g of liquid hydrocarbon, 4 g of isopropanolamide of oleic acid and 4 g of sorbitan monooleate. The resulting emulsion is placed into a liter glass resin kettle equipped with a stirrer, a nitrogen sparger, a thermometer, a water bath and gas exit. The kettle containing the emulsion is sparged with nitrogen for about 1 hour to remove oxygen. The emulsion is then subjected to polymerization conditions as described in U.S. Pat. No. 3,284,393 to form a water-in-oil emulsion of acrylamide/acrylic acid copolymer. After polymerization, 90 g of an aqueous solution of 16 g of Na2CO3 is added to the water-in-oil emulsion. To this emulsion is then added 7 g of Tergitol 15-S-9 (inverting surfactant) with stirring. The resulting emulsion is then tested for invertibility by the following procedure.

1. additionThis aqueous phase is then dispersed in an oil phase which
2. customequipped with a stirrer
3. additionThe kettle containing the emulsion
4. customis sparged with nitrogen for about 1 hour
5. customto remove oxygen
6. customThe emulsion is then subjected to polymerization conditions