适于煤层气锆冻胶压裂液的聚丙烯酰胺合成

Synthesis of Polyacrylamide used in Zirconium Gelling Fracturing Fluid of Coal-bed Methane

针对煤层气压裂液所用锆交联冻胶对聚丙烯酰胺(PAM)相对分子质量及其分子链上—COO—数目和分布要求严格等问题,分别以丙烯酰胺、过硫酸铵作为聚合单体和引发剂,采用双温度调控水溶液自由基聚合法,制备了链结构可控的PAM。考察了反应温度、单体含量、反应时间、引发剂加入量和加入温度等因素对PAM相对分子质量、水解度等特性参数的影响,初步探讨了合成条件与PAM性能之间的关系。同时,通过正交实验得出了具有较好锆交联效果的PAM合成条件。

Polyaerylamide （PAM） with controlled chain structure and better capability of cross-linking with zirconium, which can be used in zirconium gelling fracturing fluid of coal-bed methane, had been synthesized using the acrylamide as synthesis monomer and the （ NH4 ） 2 S2O8 as the initiator by the method of the watery solution radical polymerization at two temperatures. The effects of kinds and amount of initiator and its feeding temperature, reaction temperature, monomer concentration, and reaction time on the performances of PAM were investigated and evaluated by orthogonal experiments.