Preparation of cationic starch with high degree of substitution(0.7) using dry process
JU Ben\|zhi, ZHANG Shu\|fen, YANG Jin\|zong( State Key Lab. of Fine Chem., Dalian Univ. of Technol., Dalian 116012, China )
In presence of alkaline catalyst BZ\|1, the cationic starch with high degree of substitution bearing quaternary amino groups was prepared via the reaction of the starch with glycidyl trimethyl ammonium chloride using the dry process. The effects of alkaline catalyst BZ\|1, reaction temperature, reaction time, amount of water on reaction efficiency were studied and discussed briefly. When the amount of the starch and that of GTA are 5.5 g and 4.5 g respectively, the optimum reaction conditions are as follows: alkaline catalyst BZ\|1 is 0.8 g, reaction time is 4 h, reaction temperature is 60 ℃ and the amount of water is 21.0%; in the meantime, the degree of substitution is 0.74, the reaction efficiency is 74%.