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通过中心复合设计优化了2,3-环氧丙基三甲基氯化铵(EPTMAC)与机械浆纤维接枝反心的工艺条件,同时研究了阳离子机械浆对纤维羧基和磺酸基、纸张性能和细小纤维留着的影响。研究结果表明,当浆浓11%、反心温度36℃、反应时间30 min、NaOH和EPTMAC的用量分别为9.1 mmol/g和36.3 mmol/g时,浆纤维的阳离子表面电荷密度为1597 mmol/kg,在反应体系中EPT- MAC的用量和反应温度是重要的影响因素。但是阳离子化反应使得浆纤维的羧基和磺酸基含量下降,当浆纤维的阳离子表面电荷密度提高到1600 mmol/kg时,羧基和磺酸基分别从98.3 mmol/kg和49.8 mmol/kg下降到23.6 mmol/kg和12.2 mmol/kg,导致浆纤维间结合力下降,成纸强度降低。添加10%电荷密度小于330 mmol/kg阳离子浆于未处理的原浆中,不仅能够有效地提高机械浆对细小组分的留着,而且能提高纸张的强度。
Through the central composite design, the process conditions of 2,3-epoxypropyltrimonium chloride (EPTMAC) and mechanical pulp fiber grafting were optimized. At the same time, the effects of cationic mechanical pulp on fiber carboxyl and sulfonic acid groups, paper Effects and fines retention. The results showed that when the concentration of NaOH and EPTMAC were 11 mmol / g and 36.3 mmol / g respectively, the cationic surface charge density of pulp fiber was 1597 mmol / g when the concentration of pulp was 11%, the reaction temperature was 36 ℃, the reaction time was 30 min, kg, the amount of EPT-MAC and the reaction temperature in the reaction system are important influencing factors. However, the cationization reaction decreased the carboxyl and sulfonic acid groups in the pulp fiber. When the cationic surface charge density increased to 1600 mmol / kg, the carboxyl and sulfonic acid groups decreased from 98.3 mmol / kg and 49.8 mmol / kg respectively 23.6 mmol / kg and 12.2 mmol / kg, respectively, resulting in a decrease in the binding force between pulp fibers and a decrease in sheet strength. The addition of 10% cationic charge of less than 330 mmol / kg cationic pulp to untreated virgin pulp can not only effectively improve mechanical retention of fine components, but also increase the strength of paper.