力化学改性木粉纤维制备水凝胶颗粒驱油剂*

Preparation of Hydrogel Particle Oil-displacing Agent by Wood Powder Fiber with Mechanochemical Modification

孙焕泉 曹绪龙 姜祖明 祝仰文 郭兰磊

SUN Huanquan CAO Xulong JIANG Zuming ZHU Yangwen GUO Lanlei

木粉价廉、来源广，含大量木质纤维素，可生物降解，绿色环保。用木粉复合水凝胶作为驱油剂，可以有效 降低生产成本。以丙烯酰胺为原料、力化学改性木粉（PWF-BA）为填充料、过硫酸钾为引发剂，N，N'-亚甲基双丙 烯酰胺为交联剂，制备了改性木粉复合水凝胶。研究了复合水凝胶的弹性、黏性、抗剪切能力及在高温高盐条件 下的抗老化性能。结果表明，经过化学处理后，木粉中的木质素和半纤维素基本被去除；随球磨时间增加，颗粒 尺寸和结晶度显著降低，比表面积增加。当球磨时间为4 h时制得的木粉在聚丙烯酰胺基体中具有良好的分散 性和界面相互作用，复合水凝胶的拉伸性能和在85 ℃盐水中的抗老化性能良好，可在三次采油中作为驱油剂使 用。图12参14

Wood powder is cheap and has a wide range of sources. It contains a large amount of lignocellulose，which is biodegradable and environmentally friendly. The oil-displacement agent compositing wood powder and hydrogel can effectively reduce the cost of production. This work used acrylamide（AM）as monomer，poplar wood fiber mechanochemically modified by ball milling（PWF-BA）as filler，potassium persulfate（KPS）as initiator，N，N'-methylenebisacrylamide（MBA）as crosslinking agent，to synthesize wood powder composite hydrogel. The elasticity，viscosity，shear resistance and anti-aging property of the composite hydrogel under high temperature and high salt conditions were studied. The results showed that after chemical treatment， the lignin and hemicellulose in the wood powder were basically removed. As the milling time increased，the particle size and crystallinity decreased significantly，and the specific surface area increased. When the ball milling time was 4 h，the wood powder obtained had good dispersibility and interfacial interaction in the polyacrylamide matrix. The tensile property of the composite hydrogel and the anti-aging performance in salt water at 85 ℃ were good. The hydrogel was expected to be used as an oil displacing agent in tertiary recovery.

10.19346/j.cnki.1000-4092.2021.03.017