氧化淀粉合成工艺研究

Study on synthetic process of oxidized starch

淀粉作为胶粘剂的基体树脂主要由含多个羟基的葡萄糖单元组成,可通过化学、物理或生物等方法深加工成性能优良、品种繁多的淀粉衍生物。以硫酸铜为催化剂、双氧水为氧化剂,制备氧化淀粉。采用单因素试验法粗选制备氧化淀粉的较佳工艺条件;然后以pH值、氧化剂和催化剂用量为试验因素,以氧化淀粉中羧基含量为考核指标,采用正交试验法进一步优选制备氧化淀粉的最佳工艺条件。结果表明:当反应温度为45℃、反应时间为2.5 h、pH值为7、氧化剂为20 mL和催化剂为4 mL时,氧化淀粉中羧基含量(0.50%)相对最高。

Starch,which was used as a matrix resin of adhesive,was mainly composed of polyhydric glucose unit. The starch derivants with good performance and multi-varieties could be obtained by chemical,physical or biological deep-processing methods. An oxidized starch with CuSO4 catalyst and H2O2 oxidant was prepared. The better process conditions of preparing oxidized starch were roughly selected by single-factor experiment method. Then with pH value,oxidant content and catalyst content as experiment factors,carboxyl content in oxidized starch as evaluation index,the optimal process conditions of preparing oxidized starch were further preferred by orthogonal experiment. The results showed that the earboxyl content（0.50%） in oxidized starch was reversely maximal when reaction temperature was 45 ℃ ,reaction time was 2.5 h,pH value was 7,oxidant and catalyst were 20 mL and 4 mL respectively.