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随着造纸原料中废纸配比及白水封闭循环程度的提高,纸机白水系统的阴离子垃圾增加和电导率不断上升,以及纸机的提速,导致单程保留率(OPR)下降及干燥条件变化,浆内施胶和表面施胶的环境及条件变得严峻起来。该文介绍了在抄纸条件波动情况下仍表现出良好效果的浆内施胶剂和表面施胶剂的化学设计技术趋势。关于浆内施胶剂,在弱酸性抄纸条件下的松香施胶剂(乳液型)的技术趋势出现了改变的倾向。为此,对计划进行了改善,采用3个关键词,即均一地“分散”于纸浆浆料内,“定着”在纸浆纤维上,“熟化”使状态发生变化,即通过加热及与硫酸铝的相互作用,使施胶剂粒子熔融。施胶效果下降的原因是随着纸机速度提高引起的干燥温度下降和由于pH上升带来的硫酸铝活性下降。研究发现,通过对相应树脂成分及其乳化剂的设计,有可能得到稳定的施胶效果。表面施胶剂方面,应用亲水基和疏水基比例最合适的原材料,已能开发出新型乳液型施胶剂,其具有良好的施胶性能、较少的发泡性及优异的机械稳定性。
With the increase of the proportion of waste paper and the closed circulation of white water in the papermaking raw materials, the increase of anionic waste and the conductivity of paper machine white water system and the speed increase of paper machine lead to the decrease of one-way retention rate (OPR) and the change of drying conditions, Sizing and surface sizing of the environment and the conditions become grim. This paper presents the trend of chemical design techniques for sizing agents and surface sizing agents that still exhibit good results in fluctuating papermaking conditions. With respect to sizing agents, there has been a trend toward a change in the technical trend of rosin sizing agents (emulsion types) under weakly acidic papermaking conditions. To this end, the program has been improved by using three key words, namely “evenly dispersed” in the pulp slurry, “fixed” on the pulp fiber, “ripening” to change the state, ie The sizing agent particles are melted by heating and interaction with aluminum sulfate. The sizing effect is due to a decrease in the drying temperature due to the increase in the speed of the paper machine and a decrease in the aluminum sulfate activity due to the increase in pH. The study found that, through the corresponding resin composition and its emulsifier design, it is possible to get a stable sizing effect. In terms of surface sizing agents, the use of the most suitable starting materials for the hydrophilic and hydrophobic groups has led to the development of new emulsion type sizing agents which have good sizing properties, less foaming and excellent mechanical stability .