反应详情

Firstly, 35 g of dimethylacrylamide (manufactured by Kojin Co., Ltd.), 17.5 g of 2-acrylamido-2-methylpropanesulfonic acid (manufactured by Sigma), and 7 mg of methylenebisacrylamide were dissolved in ion-exchanged water, and the pH value of the resulting solution was adjusted at 7.0 by the addition of sodium hydroxide. Thereafter, 260 g of n-hexane, 8.7 g of polyoxyethylene (3) oleyl ether (EMULEX 503, manufactured by Nihon Emulsion Co., Ltd.), and 17.6 g of polyoxyethylene (6) oleyl ether (EMULEX 506, manufactured by Nihon Emulsion Co., Ltd.) were introduced into a 1,000 ml three-neck flask provided with a reflux device, were mixed together, and were thus subjected to dissolution. The inside atmosphere of the three-neck flask was then replaced by an N2 gas. The aqueous monomer solution having been prepared in the manner described above was then introduced into the three-neck flask. The resulting mixture was heated to a temperature of 65° C. to 70° C. in an oil bath, while the mixture was being stirred under the N2 gas atmosphere. At the stage at which the system had reached the temperature of 65° C. to 70° C., it was confirmed that the system had come into a semitransparent microemulsion state, and 2 g of ammonium persulfate was then added to the polymerization system. Polymerization was thus begun. The polymerization system was kept at the temperature of 65° C. to 70° C. with stirring, and a microgel was thus formed. After the polymerization had finished, acetone was added to the microgel suspension, and the microgel was thus precipitated. Subsequently, washing with acetone was performed three times, and the residual monomers and the surfactants were thus removed. The obtained precipitate was collected by filtration and dried under reduced pressure, and a white powder-like microgel dry product was thereby obtained.

1. customprovided with a reflux device
2. additionwere mixed together
3. dissolutionwere thus subjected to dissolution
4. customThe aqueous monomer solution having been prepared in the manner
5. additionabove was then introduced into the three-neck flask
6. temperatureThe resulting mixture was heated to a temperature of 65° C. to 70° C. in an oil bath, while the mixture
7. customthe temperature of 65° C. to 70° C., it
8. additionwas then added to the polymerization system
9. customPolymerization
10. customwas kept at the temperature of 65° C. to 70° C.
11. customa microgel was thus formed
12. customthe microgel was thus precipitated
13. washSubsequently, washing with acetone
14. customthe residual monomers and the surfactants were thus removed
15. filtrationThe obtained precipitate was collected by filtration
16. customdried under reduced pressure
17. customa white powder-like microgel dry product was thereby obtained