羟丙基甲基纤维素接枝丙烯酸甲酯/醋酸乙烯酯新型固沙剂的合成及应用

采用乳液接枝共聚合法制备羟丙基甲基纤维素(HPMC)接枝丙烯酸甲酯(MA)/醋酸乙烯酯(VAc)新型固沙剂。实验考察了单体配比、乳化剂十二烷基苯磺酸钠(SDBS)用量、引发剂过硫酸铵(APS)用量、HPMC用量及聚合温度对合成乳液性能的影响。采用FT-IR、TG对乳液进行表征，并初步研究了固沙剂的表面固沙效果、保水性和抗压强度等固沙性能。实验结果表明，单体质量配比(m_MA:m_VAc)3:5、SDBS质量分数4.5%、APS质量分数0.8%、HPMC质量分数20%、聚合温度为60℃时，固沙剂乳液的黏度、流动性、产品外观和静置稳定性等均较好；固沙剂在240℃下热稳定性良好，保水性和压缩强度能够满足实际固沙应用中的要求。

Synthesis of hydroxypropyl methyl cellulose grafted methacrylate/vinyl acetate and its application as a new sand-fixing agent

A new sand-fixing agent, hydroxypropyl methyl cellulose (HPMC) grafted methyl methacrylate (MA)/vinyl acetate (VAc), has been synthesized by means of emulsion graft copolymerzation. The effects of varying the ratio of monomers, the dosage of dodecyl benzene sulfonate (SDBS), the amounts of the initiator ammonium persulfate (APS) and HPMC, as well as the polymerization temperature, on the properties of the emulsion were investigated. The copolymer emulsion was characterized by FT-IR and TG, and the water retention and other sand-fixing properties were also studied. The experimental results showed that the optimal global properties of the emulsion including the sand-fixing viscosity, mobility, appearance and storage stability-were achieved when the mass ratio of monomer (m_MA:m_VAc) was 3∶5, mass percentages of SDBS, APS and HPMC were 4.5%, 0.8%, 20%, respectively (based on the total mass of the monomers and HPMC), at a polymerization temperature of 60℃. The sand-fixing agent showed good thermal stability at 240℃. The water retention and compression strength of the sand-fixing agent can satisfy the practical requirements for sand-fixation.