论文部分内容阅读
合成了2-(1-氨基-8-萘酚-3,6-二磺酸钠)-4,6-二氯-1,3,5-三嗪(SHACT),用于微晶纤维素(MCC)的改性,研究了改性纤维素的结构与水解性能的关系。以三聚氯氰(TCT)、1-氨基-8-萘酚-3,6-二磺酸单钠为原料,合成SHACT;将SHACT用于微晶纤维素的修饰,用FT-IR表征其接枝效果,并通过WAXD分析改性后纤维素的结晶结构;并将修饰后的微晶纤维素于130℃、固液比为1∶20的条件下用8%(wt,质量分数,下同)H_2SO_4水解5h,研究SHACT的用量对纤维素微晶结构和水解性能的影响。实验结果表明,经SHACT改性后,微晶纤维素的结晶结构发生了变化:无定形区含量增加,结晶指数下降,晶粒尺寸减小;微晶纤维素水解后还原糖的得率有所提高,当SHACT相对摩尔含量为4.76%时,微晶纤维素水解后还原糖的得率最大(9.71%)。
Synthesis of sodium 2- (1-amino-8- naphthol-3,6-disulfonate) -4,6-dichloro-1,3,5-triazine (SHACT) for microcrystalline cellulose MCC) modified, the relationship between the structure and hydrolysis properties of modified cellulose was studied. SHACT was synthesized by using TCT and monosodium 1-amino-8-naphthol-3,6-disulfonate as raw materials. SHACT was used to modify microcrystalline cellulose and characterized by FT-IR Grafting effect and the WAXD analysis of the crystalline structure of the modified cellulose; and the modified microcrystalline cellulose at 130 ℃, solid-liquid ratio of 1:20 with 8% (wt, mass fraction, under The same) H_2SO_4 hydrolysis 5h, study the amount of SHACT cellulose microcrystalline structure and hydrolysis properties. The experimental results show that the crystalline structure of microcrystalline cellulose changes after SHACT modification: the amorphous content increases, the crystallinity index decreases, and the grain size decreases; the yield of reducing sugar after microcrystalline cellulose hydrolysis When the relative molar content of SHACT was 4.76%, the yield of reducing sugar after microcrystalline cellulose hydrolysis was the highest (9.71%).