Carboxymethyl chitosan was further modified by introducing a hydrophobic moiety to become surface-active polymers.Synthesis of carboxymethyl chitosan thiosulfate derivatives with high activity.The oleic acid imidazoline quaternary ammonium salt was synthesized from oleic acid, diethylenetriamine and benzyl chloride.The synthesized products were characterized by infrared spectroscopy (FTIR).Corrosion tests and electrochemical experiments were performed to study the corrosion inhibition performance of oleic acid-based imidazoline quaternary ammonium salt, thio-cmch and its reinjection of Q235 Bsteel in the oil field.A hot stage microscope was used to analyze the corrosion morphology of the metal.The results showed that the quaternary ammonium salt of oleic acid imidazoline first increased with the increase of the content and then tended to be flat.The maximum inhibition rate was 84.97％ at 300mg/L.The thio-cmch gradually became flat with the increase of the content, maximum corrosion inhibition rate was 92.89％ at 300mg/L.The adsorption of oleic acid imidazoline quaternary ammonium salt and thio-cmch on the surface of carbon steel obeys Langmuir's rule.It is a spontaneous mixed corrosion inhibitor;oleic acid imidazoline quaternary ammonium salt and the inhibition efficiency of thio-cmch was greatly improved by competitive adsorption and synergistic effect.When the concentration was 100∶200, the inhibition efficiency reached 95.69％.%通过引入疏水部分成为表面活性聚合物,进一步改性羧甲基壳聚糖,合成活性较高的羧甲基壳聚糖硫代衍生物同时利用油酸、二乙烯三胺、氯化苄为原料合成了油酸咪唑啉季铵盐(OI);利用红外光谱(FTIR)对合成产物进行表征,用腐蚀试验和电化学实验研究了OI,羧甲基壳聚糖硫代衍生物(thio-cmch)以及其复配时对Q235B钢在60℃下油田回注水的缓蚀性能,并用热台显微镜对金属腐蚀形貌进行分析.结果表明:OI随质量浓度的增加先增大后趋于平缓,在质量浓度为300mg/L时缓蚀率最大为84.97％;thio-cmch随含量增加逐渐趋于平缓,在质量浓度为300mg/L时缓蚀率最大为92.89％;OI和thio-cmch在碳钢表面的吸附遵循Langmuir规律,为自发进行的混合型缓蚀剂;OI和thio-cmch通过竞争吸附和协同效应大幅度提高了缓蚀效率,当以质量浓度比100∶200复配时,缓蚀效率达到95.69％.
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