范文编号:CL033 范文字数:13032,页数:27 摘要:羧甲基淀粉是一种重要的变性淀粉,因其应用广泛、性能优良具有良好的开发前景。本文分别研究了以玉米淀粉为原料,乙醇为溶剂,及以马铃薯淀粉为原料,异丙醇为溶剂,氯乙酸为醚化剂制取粉末状高取代度高粘度羧甲基淀粉(CMS)的两种方法。本文还考察了水的量、反应温度,溶剂等因素对产品取代度、粘度的影响。结果表明:以异丙醇为溶剂,马铃薯淀粉作为原料制备CMS,在50℃时取代度和粘度达到最好,且在一定范围内,粘度与加的水的量成反比。而以乙醇为溶剂,玉米淀粉为原料制取CMS的实验中,发现溶剂对产物没有明显影响,而粘度随水量的增加先升后降,在加入14g水时粘度达到最大,且发现加水的时间不同也影响粘度,碱化后再加水更有利于粘度的增加。 Abstract: Carboxymethyl starch, is an kind of important, widely used modified starch because of its excellent performance with good development prospects. This paper studies withwo methods which use corn starch as raw material, ethanol as solvent, and potato starch as raw material, isopropyl alcohol as solvent, chloroacetic acid as etherification agent to obtain powder high viscosity and hign degree of substitution carboxymethyl starch (CMS). And also examine the effect of volume of water, temperature, solvent and other factors to the degree of substitution and viscosity. The results showed that:in the experiment of isopropanol as solvent, potato starch as the raw material preparare CMS, at 50 ℃ degree of substitution and viscosity to achieve the best, and in a certain range, viscosity and inversely proportional to the amount of water added. And in the experiment of ethanol as solvent, corn starch as raw materials to prepare CMS,we found that the solvent had no significant effect on the product, while the viscosity increases with the amount of water and then decreased, and add 14g water can get the maximum viscosity . And found that add water in different periods of time also affects the viscosity, add water after make alkaline can increase viscosity visibly. Keywords:Carboxymethyl starch Synthesis Degree of substitution(DS) Starch 目 录 高取代度高粘度CMS的合成相关范文 |
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