【作者】 周林杰；

【导师】 陈夫山； 王立军；

【作者基本信息】 天津科技大学 ， 制浆造纸工程， 2006， 硕士

【摘要】 森林资源匮乏，纤维原料短缺直接影响着造纸工业的发展。近年来，按照科学发展观要求，发展循环经济，世界各国都高度重视废纸资源的循环回收利用，其回收率和利用率也逐年增长。但由于在废纸回收过程中不可避免地带入大量杂质，所以在废纸浆的利用过程中会产生很多问题和困难，其中以胶粘物问题最为严重，直接影响纸机的正常抄造。 如何有效地去除和控制胶粘物，首先应注重机械和物理的方法的优化，但是，即便如此，仍有较大量的胶粘物成分会残留，而且它们大多属于溶解与胶体物质(DCS)的范畴，通常只能借助生物或化学的方法来去除或控制。生物法主要利用生物酶降低胶粘物的尺寸与粘性，化学法则主要包括分散稳定、吸附、表面钝化、固定等几种，其中使用固定剂的化学固定法由于操作方便、效果显著被广泛采纳应用，同时由于它与表面钝化、生物酶降解、溶气气浮等其它方法均有关联，值得深入研究。 本论文以聚合氯化铝(PAC)、聚胺(PA)、聚二甲基二烯丙基氯化氨(PDADMAC)和高取代度阳离子淀粉(HCS，低分子量的为HCS_LMw，高分子量的为HCS_HMw)等作为固定剂，研究它们对废纸浆中微胶粘物的控制效果及对纸页性能的影响。研究表明，将固定剂单一地或者将固定剂与聚丙烯酰胺／膨润土微粒助留剂组成协同系统作用于废纸浆，经HCS处理过的浆料的ξ电位上升较其它几种固定剂快，说明HCS更易被纤维吸附；在阳电荷加入量相同的情况下，HCS比其它几种固定剂更有利于吸附浆料中的DCS，主要表现在能使浆料液相的浊度、阳离子需求量、COD含量以及抄造后纸张的白度下降得更多(纸张的不透明度上升得更快)。HCS与DCS的作用超过了阴阳离子一对一的等摩尔电荷中和作用关系，说明DCS除了以电荷中和机理被去除外，还以絮凝作用机理被去除。在维持纸张的强度性能方面，有机的PA、PDADMAC和HCS要好于无机的PAC。总体上，可以在废纸浆中适当地利用高取代度淀粉，得到更佳的微胶粘物控制效果，同时不影响纸张匀度和强度性能。更多还原

【Abstract】 Currently, the development of papermaking industry is retarded by the shortage of forest resources. The utilization of recycled paper increased year by year in many countries. However, recycled paper consists of a big amount of impurities which causes many troubles in recycling and papermaking processes, among which stickies problem is the most serious one.Great attention should be paid on the optimization of mechanical and physical treatments to control or to eliminate stickies components effectively. Even so, micro-stickies, which belongs to dissolved and colloidal substances (DCS), will still be left in the system, and they can be only dealt with by biological or chemical treatments. Biological methods mainly use enzymes to decrease the size and tackiness of stickies, while most of the chemical methods are based on mechanisms of dispersed stablization, adsorption, surface passivation and fixation. Among them the chemical fixation with fixing agents is most widely accepted because it has remarkable effectiveness and it is very easy to be applied in papermaking process. Besides, fixation principles are also related to some of the other methods such as surface passivation, biological degradation, and dissolved air flotation, therefore, it is thought to be the very field that is worthy of being further investigated.In this paper, the microstickies control effects of some fixatives on properties of newsprint recycled pulp were investigated, which include inorganic polyaluminum chloride (PAC), organic polyamine (PA), polydiallydimethyl ammonium chloride (PDADMAC), and two high cationic starches (HCS) with different average molecular weights (HCS_HMw for the higher one and HCS_LMw the lower one). The results showed that the HCSs, no matter being used in its single form or in combination with a cationic polyacrylamide/bentonite microparticle retention system, increased pulp zeta potentials higher than the other fixatives did (also in single or combination with the microparticle retention aids), indicating that the HCSs were easier to be absorbed onto pulp fibers. Dosed in same amount of cationic charges, the HCSs can fix more DCS components to cellulose fibers than the other fixatives, giving the liquid phase of the pulp slurries更多还原