耐盐型疏水缔合聚合物的制备及流变性能

Synthesis and Rheological Properties of a Salt-resistant Hydrophobic Association Polymer

采用丙烯酰胺(AM)、丙烯酸(AA)、2-丙烯酰胺-2-甲基丙烷磺酸(AMPS)和水溶性阴离子疏水单体S-18制备了新型耐盐疏水缔合聚合物S-18HPAM。聚合放热测试表明:疏水单体含量的增加导致放热时间的延长,更有利于疏水结构的形成。微观结构测试表明:聚合物具有复杂的网状结构,在NaCl溶液中网状结构更为明显。流变测试结果表明:聚合物在盐溶液中具有良好的耐温和抗剪切性能。聚合物质量分数为0.3%(基于溶液总质量),温度90℃,剪切速率170 s–1和NaCl质量浓度20000 mg/L条件下,剪切后表观黏度大于70 mPa·s。在总矿化度20000 mg/L模拟地下水条件下,S-18HPAM质量分数为0.3%,剪切后黏度为70 mPa·s,加入质量分数0.5%表面活性剂十二烷基硫酸钠(SDS)后,黏度增加到170m Pa·s。储能模量G’随着聚合物质量分数的增加而增大,体系弹性增强,同时疏水结构单元数量增加,形成致密的空间网络结构。

A novel salt-resistant hydrophobic association polymer S-18 HPAM was prepared from acrylamide(AM),acrylic acid(AA),2-acrylamide-2-methyl propane sulfonic acid(AMPS)and hydrophobic monomer S-18.The results showed that the increase of hydrophobic monomer content led to the extension of exothermic time,which was more conductive to the formation of hydrophobic structure.Microstructure test demonstrated that the polymer had complex network structures,which was more obvious in Na Cl solution.Rheological test results indicated that the polymer had good temperature resistance and shear resistance in NaCl solution.Moreover,the apparent viscosity of the polymer solution remained greater than 70 mPa·s under the conditions of addition amount of S-18 HPAM 0.3%(based on the total mass of the solution),temperature 90℃,shear rate 170 s-1 and mass concentration of NaCl solution 20000 mg/L.When the total salinity of simulated ground water was 20000 mg/L and the addition amount of S-18 HPAM was 0.3%,the viscosity of solution after shearing was 70 mPa·s.While the viscosity of solution increased to 170 m Pa·s after the addition of 0.5%surfactant sodium dodecyl sulfate(SDS).The storage modulus(G?)increased with the increase of polymer mass fraction,and the system elasticity increased.Meanwhile,the increase in the number of hydrophobic micro-zones was conductive to the formation of dense spatial network structures.