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木质素是造纸工业废液中的主要成分,具有与酚醛树脂相似的结构,因此可以部分替代苯酚用于酚醛树脂的生产。采用造纸废液替代部分苯酚制备改性酚醛树脂胶粘剂,并将该胶粘剂用于全桦三层胶合板的压制。在改性胶粘剂合成过程中,采用二次缩聚法、强碱性催化剂分3批投入,并以投料量、投料温度和粘度为可变因素设计正交实验,分析各因素对胶合板的胶合强度及浸渍剥离率的影响。实验结果表明,当w(造纸废液)=10%、投料温度为50℃和投料粘度为25s时,所压制的胶合板能够达到GB/T 9 846.7-2004Ⅰ类板的标准要求,并使造纸废液的污染程度和成本明显降低。
Lignin is the main component of paper industry waste, with a similar structure and phenolic resin, it can be partially replaced by phenol for the production of phenolic resin. Using papermaking waste instead of part of phenol to prepare modified phenolic resin adhesive, and the adhesive is used for pressing three layers of plywood. In the process of modified adhesive synthesis, two-step polycondensation method was used. The strong base catalyst was put into three batches. The orthogonal experiment was designed with variable dosage, feeding temperature and viscosity as variables. The bonding strength and Impregnation peel rate effect. The experimental results show that when the w (papermaking wastewater) = 10%, the feed temperature is 50 ℃ and the feed viscosity is 25s, the plywood pressed can meet the standard requirements of GB / T 9 846.7-2004 class Ⅰ board, Liquid pollution levels and costs significantly reduced.