疏水缔合聚合物P（AM/PTDAB/AMPS/NaAA）的制备 及性能评价*

采用水溶液聚合后水解法,以丙烯酰胺(AM)、(4-丙烯酰胺基)苯基十四烷基二甲基溴化铵(PTDAB)、2-丙烯酰胺基-2甲基丙磺酸(AMPS)为原料合成了疏水缔合聚合物P(AM/PTDAB/AMPS/NaAA),通过考察反应条件对合成聚合物的特性黏数、溶解性以及增黏性的影响规律确定了最佳合成条件,研究了最佳合成条件下所合成聚合物的耐温抗盐性、剪切稳定性以及热稳定性。聚合物的最佳合成条件为:PTDAB加量为总单体质量的0.5%~0.8%,AMPS加量为总单体质量的15%,总单体质量分数为25%,复合引发剂加量为总单体质量的0.1%,pH值为8,引发温度30℃。采用矿化度100 g/L的盐水配制的质量浓度2000 mg/L的合成聚合物溶液的黏度仍大于30 mPa·s;采用矿化度20 g/L的盐水配制质量浓度2000 mg/L的合成聚合物溶液在转速5000 r/min下剪切3 min再静置4 h后的黏度保留率可达80%以上;聚合物溶液在85℃高温老化150 d后的黏度大于20 mPa·s。所合成四元共聚物表现出优异的耐温抗盐性、剪切稳定性以及热稳定性,性能优于高相对分子质量抗盐聚丙烯酰胺P(AM-AMPS-NaAA)。

Synthesis and Solution Properties of AM/PTDAB/AMPS/NaAA Quaternary Copolymer

The hydrophobic association quaternary copolymer was synthesized by aqueous solution polymerization using acrylamide(AM),(4-acrylamide)phenyl tetradecyl dimethyl ammonium bromide(PTDAB),2-acryamido-2-methylpropanesulfonic acid(AMPS)and subsequent hydrolysis.The effects of reaction conditions on the intrinsic viscosity,solubility and increase viscosity of the synthesized polymer were investigated to determine the optimal synthesis conditions.The temperature resistance,salt resistance,shear stability and thermal stability of the synthesized polymer under the optimal synthesis condition were studied.The optimum synthesis condition was determined as follows:PTDAB content was 0.5%—0.8%of total monomer mass,2-acryamido-2-methylpropanesulfonic acid content was 15%—20%of total monomer mass,total addition amount of the monomers was 25%,compound initiator content was 0.1%of total monomer mass,pH value was 8 and the reaction temperature was 30℃.When the solvent salinity was 100 g/L,the viscosity of the quaternary copolymer solution with the concentration of 2000 mg/L was still greater than 30 mPa·s,and when the solvent salinity was 20 g/L,the mechanical shear viscosity retention rate of the synthetic polymer solution with the concentration of 2000 mg/L could reach more than 80%,sheared at a speed of 5000 r/min for 3 min and then stood for 4 h,the viscosity of the solution aging at 85℃for 150 days,was greater than 20 mPa·s.The results showed that the quaternary copolymer had better salt tolerance,heat resistance,ability of shear stability and thermal stability,compared to the high molecular weight salt resistant polyacrylamide P(AM-AMPS-NaAA).