驱油用超支化抗剪切聚丙烯酰胺的合成及溶液性能

Synthesis and Solution Properties of a Hyperbranched Polyacrylamide with High Shear-resistance for oil Flooding

摘要:

以聚环糊精（HCD）为母核，丙烯酰胺（AM）及甲基丙烯酰乙基磺基甜菜碱（BTAM）为接枝单体，在铈盐-羟基引发体系下，通过水相自由基聚合，制备了一种具有球形母核及两性离子功能链段的超支化聚合物HCD-HPAM-BTAM。考察了聚合时间（T1）、引发剂用量（M[O]）、HCD用量（MHCD）、水解烘干温度（t）、BTAM用量（MBTAM）等对聚合物溶液粘度的影响。采用1HNMR对聚合物进行了结构表征，并对其溶解、增粘、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=5.5h、M[O]=60mg、MHCD=20-30mg、t=120oC、MBTAM=200mg。在9374.13mg/L的矿化水中，HCD-HPAM-BTAM聚合物基本溶解时间均小于40min，2000mg/L的聚合物溶液粘度可达到31.2 mPa?s，Waring搅拌器1档剪切20s后粘度保留率高达80%，老化90天粘度保留率为63%，均优于未改性HPAM聚合物。

Abstract:

A Hyperbranched polymer was synthesized from polycyclodextrin (HCD), acrylamide (AM), methacryloxyethylsulfobetaine (BTAM) as monomer by aqueous free radical polymerization via create-hydroxyl initiator system. The polymer possessed spherical nucleus and zwitterionic functional segments. The effects of polymerization time (T1), amount of the initiator dosage (M[O]), HCD dosage(MHCD), hydrolysis drying temperature (t) and BTAM dosage (MBTAM) on the polymer solution viscosity were investigated. The structure of the obtained polymer was characterized by 1HNMR and the solubility, thickening property, shear resistance, salt tolerance and anti-aging property were evaluated. The results indicated that the optimum polymerization conditions were T1=5.5h, M[O]=60mg, MHCD=20-30mg, t=120oC, MBTAM=200mg. In the 9374.13mg/L mineralized water, the basic dissolution time of HCD-HPAM-BTAM polymer was less than 40min, the viscosity of 2000mg/L polymer solution can reach 31.2 mPa?s, and the viscosity retention rate after shearing by the Waring stirrer level 1for 20s was as high as 80%, and viscosity retention rate after 90 days aging was as high as 63%, which were all better than the unmodified HPAM polymer.