两性离子型酸液稠化剂的合成与酸降解

Synthesis and Acid Degradation of Zwitterionic Copolymer Acidic Thickener

为揭示两性离子酸液稠化剂在高温酸液中的降解行为,用甲基丙烯酰氧乙基三甲基氯化铵(DMC)和2-丙烯酰胺基-2-甲基丙磺酸钠(AMPS)合成了一种两性离子共聚物酸液稠化剂CXS,通过降解前后的黏度、分子量、红外光谱和核磁共振谱图的变化研究了CXS在120℃高温和不同酸浓度条件下的降解行为,并对降解机理进行了分析。结果表明,随着酸浓度的增加,CXS降解程度增大,降解产物中低分子量组分的含量增加,CXS在2%HCl中降解后的黏度降幅小于40%,在10%HCl中降解后的黏度降幅大于80%;CXS共聚物在酸和高温的作用下主要以主链的断链为主、伴有酯键和酰胺键的断裂。

In order to reveal the degradation behavior of zwitterionic copolymer thickener in acid at high temperature,a zwitterionic copolymer acidic thickener（CXS） was synthesized using methacryloyloxyethyl trimethyl ammonium chloride（DMC） and2-acrylamido-2-methylpropane sulfonate（AMPS）. The degradation of CXS under 120℃ and different acid concentrations was studied through the change of viscosity,molecular weight,infrared spectrum and nuclear magnetic resonance spectrum before and after degradation. The results showed that the degradation degree of CXS obviously aggravated with increasing acid concentration,and the content of component with low molecular weight in degradation product increased. The viscosity of CXS degraded in 2%HCl solution reduced less than 40%,while that decreased more than 80% in 10% HCl solution. Under an acid environment and high temperature condition,backbone scission of CXS copolymer chiefly occurred during the degradation process,accompanied by ester bond and amide bond cleavage.