高抗剪切聚丙烯酰胺类聚合物驱油剂的合成及性能

Synthesis and Properties of Polyacrylamide Polymer Flooding Agent with High Shear Resistance

针对目前线性聚丙烯酰胺类聚合物抗剪切性能无法满足应用需求的问题,设计合成了一种具备三维立体球形母核及两性离子功能链段的超支化聚合物,该聚合物由高分子核聚醚(HPG)母核、聚丙烯酰胺(HPAM)、聚丙烯酸及聚2-(二甲胺基)甲基丙烯酸酯乙基溴代甜菜碱(C10AM)链段组成。考察了聚合时间(T1)、引发剂用量(M[O])、HPG用量(MHPG)、水解烘干温度(t)、C10AM用量(MC10AM)等对聚合物溶液黏度的影响。采用1HNMR对聚合物进行了结构表征,并对其溶解、增黏、抗剪切、抗盐及抗老化性能进行了评价。结果表明,最佳的聚合条件为:T1=5. 5 h、M[O]=60 mg、MHPG=20 mg、t=120℃、MC10AM=150 mg。在9 374. 13 mg/L的矿化水中,HPG-HPAM-C10AM聚合物基本溶解时间均小于50 min,2 000 mg/L的聚合物溶液黏度可达到37. 7 m Pa·s,Waring搅拌器1档剪切20 s后黏度保留率高达70%,老化90 d黏度保留率为76%,均优于未改性HPAM聚合物。

In order to solve the problem that the shear resistance of current linear polyacrylamide polymers can not meet the application requirements, a hyperbranehed polymer with three-dimensional spherical nucleus and zwitterionie functional segments was designed and synthesized. The polymer is composed of polycyclodextrin （HPG） nucleus, polyacrylamide （HPAM）, polyacrylic acid and poly 2-（ dimethylamino） methacrylate ethyl bromobetaine （C10AM） segments. The effects of polymerization time （ T1 ）, initiator dosage （M[O] ）, HPG dosage （MHPG ）, hydrolysis drying temperature （t） and C10AM dosage （MC10AM ） on the viscosity of polymer solution were investigated,and the dissolution,viscosity increasing, shearing resistance, salt resistance and anti-aging properties of the polymer were evaluated. The results show that,the optimum polymerization conditions were T1 =5.5 h,M[O]=60 mg,MHPG =20 mg,t = 120℃ ,MC10AM = 150 mg. In the mineralized water of 9 374.13 mg/L,the basic dissolution time of HPG-HPAM-C10AM polymer is less than 50 min,the viscosity of the polymer solution of 2 000 mg/L can reach 37.7 mPa · s,the viscosity retention rate is as high as 70% after shearing 20 s using the first gear of Waring stirrer, and the viscosity retention rate is as high as 76% after aging 90 days, which were all better than the unmodified HPAM polymer.