羧甲基淀粉的干法制备及特性研究

Dry Preparation and Properties of Carboxymethyl Starch

采用现代环保干法工艺以取代度为指标,通过二次通用旋转组合试验设计,对玉米淀粉进行羧甲基醚化改性处理研究,得出回归模型。结果表明,羧甲基化改性的最佳工艺条件为醚化温度为74.44℃,NaOH/淀粉的物质的量比值为1.85,醚化时间2.33 h,乙醇浓度为84.65%,羧甲基化改性淀粉取代度为0.49,反应效率为81.7%。并利用布拉班德黏度仪、生物显微镜以及红外光谱仪对改性淀粉进行表征。为实现大规模工业化生产提供理论依据和实际参考。

Carboxymethyl starch was prepared from corn starch under pollution - free dry condition. The regression equation of substitution degree with factors was established by using quadratic general rotary experiment design. The confinned optimum technology conditions are as follows： reaction temperature 74.44℃, NaOH/starch molar ratio 1.85, reaction time 2.33 h, alcohol content 84.65%. The substitution degree of the carboxymethyl starch is up to 0.49, and the react efficiency up to 81.7%. Carboxymethyl starch was characterizated by Brabender viscometer, biomicroscopy and infrared spectrometer. It applies for theory basis and practical reference for large scale industrialized production.