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以阳离子硫酸盐浆的表面电荷密度为评价指标,采用中心复合设计法对丙烯酰胺(AA)和甲基丙烯酰氧基乙基三甲基氯化铵(MAETMAC)接枝共聚制备阳离子硫酸盐浆的工艺进行了优化。研究结果表明,反应温度(X2)、MAETMAC摩尔分数(X3,占总单体)以及引发剂铈硝酸铵的量(X4)对评价指标有非常显著的影响(P<0.01),反应时间(X5)对评价指标有显著影响(P<0.1),而硝酸的浓度(X1)对评价指标无显著影响(P>0.1)。拟合所得多元二次方程为Y=816+87.13X2+79.54X3+91.71X4+36.88X5–53.44X1X4–68.76X22–51.89X32–71.39X42,相关系数R2=0.9090。当浆浓固定为10%,总单体的用量为10mmol/g浆时,制备阳离子硫酸盐浆优化工艺为:硝酸的浓度为0.002mol/L、反应温度为63℃、MAETMAC摩尔分数为65%、引发剂铈硝酸铵的量14.32%(占绝干浆)、反应时间为208min,该工艺得到的阳离子硫酸盐浆表面电荷密度为1055mmol/kg。通过验证实验表明,本优化方程有良好的预测性。
Based on the evaluation of the surface charge density of cationic kraft pulp, cationic composite pulp was prepared by graft copolymerization of acrylamide (AA) and methacryloyloxyethyltrimethylammonium chloride (MAETMAC) The process is optimized. The results showed that the reaction temperature (X2), the mole fraction of MAETMAC (X3, total monomer) and the amount of cerium ammonium nitrate as initiator (X4) had a very significant influence on the evaluation index (P <0.01) ) Had a significant effect on the evaluation index (P <0.1), while nitric acid concentration (X1) had no significant effect on the evaluation index (P> 0.1). The fitted multivariate quadratic equation was Y = 816 + 87.13X2 + 79.54X3 + 91.71X4 + 36.88X5-53.44X1X4-68.76X22-51.89X32-71.39X42 with a correlation coefficient R2 = 0.9090. When the slurry concentration is fixed at 10% and the total monomer content is 10 mmol / g slurry, the optimum conditions are as follows: the concentration of nitric acid is 0.002 mol / L, the reaction temperature is 63 ℃, the molar fraction of MAETMAC is 65% , And the amount of cerium ammonium nitrate as initiator was 14.32% (absolute dry pulp). The reaction time was 208min. The surface charge density of cationic sulfate pulp was 1055mmol / kg. Through the verification experiments show that the optimization equation has good predictability.