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通过接枝共聚使纸浆纤维阳离子化能有效地提高纸浆强度和对填料和细小纤维的助留。本实验系统地研究了单体的种类以及阳离子单体和非离子单体的比例对接枝共聚制备阳离子硫酸盐浆的影响。研究结果表明,阳离子单体甲基丙烯酰氧基乙基三甲基氯化铵(MAETMAC)比二烯丙基二甲基氯化铵(DADMAC)更容易与硫酸盐浆纤维接枝共聚,在相同的反应条件下,等物质的量(3.6 mmol/g)的阳离子单体MAETMAC和DADMAC分别与硫酸盐浆反应,浆纤维的表面电荷密度分别为189.24 mmol/kg和26.45 mmol/kg。非离子单体丙烯酰胺(AM)与阳离子单体MAETMAC和DADMAC在与硫酸盐浆接枝反应时具有协同作用,能显著提高浆纤维的表面电荷密度,尤其是当阳离子单体n(MAETMAC)∶n(DADMAC)=1∶1,总阳离子单体用量为3.6 mmol/g且与中性单体的物质的量比为2∶3时协同作用最为明显,浆纤维表面电荷密度达到311.77 mmol/kg。
Cationicization of pulp fibers by graft copolymerization can effectively improve pulp strength and retention of fillers and fines. This experiment systematically studied the monomer types and the proportion of cationic monomer and non-ionic monomer graft copolymerization of cationic sulfate pulp. The results show that the cationic monomer methacryloyloxyethyltrimethylammonium chloride (MAETMAC) is more easily graft copolymerized with sulfate pulp fibers than the diallyldimethylammonium chloride (DADMAC) The same reaction conditions, the amount of other substances (3.6 mmol / g) of the cationic monomer MAETMAC and DADMAC were respectively reacted with kraft pulp, pulp surface charge density of 189.24 mmol / kg and 26.45 mmol / kg. The synergistic effect of the nonionic monomer acrylamide (AM) and the cationic monomers MAETMAC and DADMAC on the grafting reaction with kraft pulp can significantly increase the surface charge density of pulp fibers, especially when the cationic monomer n (MAETMAC): n (DADMAC) = 1: 1, the total amount of cationic monomer is 3.6 mmol / g and the synergistic effect is most obvious when the molar ratio of neutral monomer is 2: 3. The surface charge density of pulp fiber reaches 311.77 mmol / kg .