Study on Preparation and Properties of Slow-Expanding Polyacrylamide-Based Nanomicrospheres
Aiming at the problems that the expansion rate of nanometer microspheres is too fast and the use effect is easily affected by the temperature and mineralization of the formation,WQ1 microsphere emulsion was prepared based on reversed-phase emulsion polymerization using acrylamide and 2-acrylamide-2-methylpropanesulfonic acid as polymerization monomers,and N,N-methylenebisacrylamide as cross-linking agent,and the structure and performance of microsphere WQ1 were investigated by infrared spectroscopy,laser particle sizing instrument,rheometer,and dissolution test.The results showed that the particle size of microspheres WQ1 was normally distributed in the range of 70-125 nm,with a median particle size of 90 nm,and the decomposition temperature was 336.15℃;the apparent viscosity of the microspheres was less affected by the high temperature and the high mineralization,presenting better temperature and salt resistance;the viscosity retention in deionized water reached 89.74％,and the viscosity retention in saline water was still 72.84％,showing better resistance to Shear;under the conditions of 25 ℃ and 60℃,the swelling multiples of microspheres were 3.7 and 4.7 times respectively after absorbing water and swelling for 120 h,which showed better slow expansion;the blocking rate of microspheres could reach more than 90％after 4 d of swelling.
万方数据
维普
