Application of weak cationic polyelectrolytes in paper and cardboard efficiency improvment technology

N.V. Сhernaya, Z. Shashok, S. Karpova, E. Uss, O. Misyurov
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Abstract

The article considers the effect of weak cationic polyelectrolytes on the structure- and paper-forming properties of glued fibrous suspensions and the quality of glued and coated paper and cardboard samples obtained from them. It is shown for the first time that the efficiency of using cationic polyelectrolytes increases by 2…3 times due to a change in the sequence of its introduction into glued fibrous suspensions (cellulose and waste paper) in relation to rosin emulsion and electrolyte, as well as by «correction» their dosages. It is found that the use of the developed technology allows cationic polyelectrolytes to participate not only in the process of flocculation, but also in the formation of new sizing complexes in the form of finely dispersed positively charged peptized particles. It is revealed that the replacement of the sizing process in the homocoagulation mode with a more efficient mode of heteroadagulation of peptized particles due to the use of weakly basic cationic polyelectrolytes provides an increase in hydrophobicity and strength of the glued types of paper and cardboard. The expediency of using cationic polyelectrolytes to obtain high-quality products in the developed resource-saving and ecologically safe technology of glued types of paper and cardboard is substantiated based on the established increase in the degree of retention of fibers and sizing complexes and the simultaneous decrease in the content of suspended solids in recycled water. It is determined that the coating of glued paper and cardboard samples obtained with weakly basic cationic polyelectrolytes improves the printing properties of the resulting products. Recommendations are given for replacing the traditionally used complex of natural compounds in the coating paste formulation, including oxidized starch (2,0 parts by weight), sodium carboxymethyl cellulose (0,7 parts by weight) and casein glue (2,0 parts by weight), for one synthetic binder — modified urea-formaldehyde oligomer (3,2 parts by weight).
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弱阳离子聚电解质在纸纸板效率改善技术中的应用
本文研究了弱阳离子聚电解质对胶合纤维悬浮液的结构和成纸性能的影响,以及从中获得的胶合和涂布纸和纸板样品质量的影响。这是第一次表明,使用阳离子聚电解质的效率增加了2…3倍,由于改变了其引入胶合纤维悬浮液(纤维素和废纸)的顺序,相对于松香乳液和电解质,以及通过“纠正”它们的剂量。研究发现,利用所开发的技术,阳离子聚电解质不仅可以参与絮凝过程,还可以以精细分散的带正电的peptized颗粒的形式形成新的施胶配合物。结果表明,由于使用弱碱性阳离子聚电解质,用一种更有效的多相聚合方式取代了均混模式的施胶过程,增加了胶合型纸和纸板的疏水性和强度。在已开发的资源节约型和生态安全的胶合型纸和纸板技术中,利用阳离子聚电解质获得高质量产品的便捷性得到了证实,这是基于纤维和施胶配合物的保留度增加,同时循环水中悬浮物含量降低。结果表明,用弱碱性阳离子聚电解质对胶合纸和纸板样品进行涂层处理,可改善产品的印刷性能。建议用一种合成粘合剂-改性脲醛低聚物(3.2重量份)取代涂料膏配方中传统使用的天然化合物复合物,包括氧化淀粉(2重量份)、羧甲基纤维素钠(0.7重量份)和酪蛋白胶(2重量份)。
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