聚（苯乙烯-丙烯酰胺）核壳型微球破胶剂的制备 与缓释效果*

Preparation and Sustained Release Effect of Poly（Styrene-acrylamide）Core-shell Microsphere Breaker

李光辉 未九森 李晓丹 吴振豪

LI Guanghui，WEI Jiusen，LI Xiaodan，WU Zhenhao

压裂液延迟破胶在压裂施工中具有重要的意义。基于核壳型微球对药物的缓释机理，通过反相微乳液聚 合制备了内部包覆过硫酸铵破胶剂的聚（苯乙烯-丙烯酰胺）核壳型微球。在聚丙烯酰胺溶液中加入微球或过硫 酸铵后置于80℃干燥箱中，通过测定不同静置时间下溶液的黏度和pH值，评价微球的缓释效果。结果表明，微 球直径为50~100 nm。微球通过吸水膨胀使过硫酸铵破胶剂缓慢释放到聚合物溶液中，延缓了破胶剂对聚合物 溶液黏度和pH值的影响，有效抑制了聚丙烯酰胺的自由基降解和氧化降解。图8参15

The delayed fracturing of fracturing fluid is of great significance in fracturing construction. Based on the sustained release mechanism of core-shell microspheres for drugs，poly （styrene-acrylamide） core-shell microsphere with internal coating ammonium persulfate breaker was prepared by inverse microemulsion polymerization. The polyacrylamide solution adding microsphere or ammonium persulfate was placed in a drying cabinet at 80℃. The sustained release effect of the microsphere was evaluated by measuring the viscosity and pH value of the solution under different standing time. The results showed that the diameter of the microsphere was 50—100 nm. The ammonium persulfate breaker slowly released into the polymer solution after water swelling of microsphere，which delayed the influence of breaker on the viscosity and pH value of polymer solution，and effectively inhibited the free radical degradation and oxidative degradation of polyacrylamide.

10.19346/j.cnki.1000-4092.2020.02.004