超支化疏水缔合聚合物的合成及性能

Synthesis and properties of hyperbranched hydrophobic association polymers

采用水溶液聚合法以丙烯酸(AA)、丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基-1-丙烷磺酸(AMPS)、疏水单体二甲基十八烷基烯丙基氯化铵(DMCAAC-18)和骨架单体(M_(1.0))为主要原料,采用过硫酸铵-亚硫酸氢钠为引发剂,合成了一种超支化疏水缔合聚合物(B-P-HPAM)。B-P-HPAM的合成条件是:单体总质量浓度为25%、引发剂加量为单体总质量的0.2%、反应温度为40℃、反应时间为4h。采用红外光谱、核磁共振氢谱、扫描电镜等对B-P-HPAM的结构进行了表征。对B-P-HPAM的增粘性、抗剪切性、耐温性能以及耐盐性能等进行了研究。实验结果表明,在65℃下用注入水配制的2000mg/L的B-P-HPAM溶液的表观粘度明显高于相同浓度普通聚丙烯酰胺(HPAM)溶液;在经过20000r/min的机械剪切30s后,2000mg/L的B-P-HPAM溶液的粘度保留率比相同浓度HPAM溶液高30%(90%vs 60%)。在相同实验条件下,HPAM、B-P-HPAM提高的采收率分别为9.6%、16.6%,B-P-HPAM表现出良好的驱油能力。

A hyperbranched hydrophobic association polymer(B-P-HPAM)was synthesized by aqueous solution polymerization using acrylic acid(AA),acrylamide(AM),2-acrylamido-2-methyl-1-propanesulfonic acid(AMPS),hydrophobic monomer dimethyl octa-decyl allyl ammonium chloride(DMCAAC-18),and skeleton monomer(M1.O)as the main raw materials,and ammonium persulfate sodium bisulfite as the initiator.The synthesis conditions of B-P-HPAM are as follows:the total monomer mass concentration is 25%,the initiator dosage is 0.2%of the total monomer mass,the reaction temperature is 40℃,and the reaction time is 4 h.The structure of B-P-HPAM was characterized by infrared spectroscopy,nuclear magnetic resonance spectroscopy,and scanning electron microscopy.The tackifier,shear resistance,temperature resistance,and salt resistance of B-P-HPAM were studied.The experimental results show that the apparent viscosity of 2000 mg/L B-P-HPAM solution prepared with injected water at 65℃is significantly higher than that of ordinary polyacrylamide(HPAM)solution with the same concentration;After mechanical shearing for 3Os at 20000 r/min,the viscosity retention of 2000 mg/L of B-P-HPAM solution was 30%higher than that of HPAM solution with the same concentration(90%vs 60%).Under the same experimental conditions,the enhanced oil recovery rates of HPAM and B-P-HPAM were 9.6%and 16.6%,respectively.B-P-HPAM showed good oil displacement ability.