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采用漆酶对草浆碱木质素进行活化预处理,并以活化木质素为原料合成改性酚醛(LPF)树脂。通过多因子正交试验,研究甲醛与苯酚的摩尔比(F/P)、木质素替代苯酚的比例、Na OH用量(Na OH/P摩尔比)、聚合粘度等工艺参数对LPF树脂耐水胶合强度的影响规律,优化LPF树脂的制备工艺条件。试验结果表明,木质素经漆酶作用后酚羟基含量提高了约17%,达到了活化木质素目的。活化木质素改性LPF树脂的优化制备工艺是F/P摩尔比2.0、木质素替代率50%、Na OH/P摩尔比0.50、聚合粘度100-200m Pa·s,其胶合强度为1.15MPa,满足了国家标准GB/T 9846.3-2004中Ⅰ类胶合板要求,大大降低酚醛树脂的生产成本,实现了木质素资源的高效利用。
The laccase was used to pretreat the alkaloid lignin and the modified lignin (LPF) was synthesized from activated lignin. Through multifactorial orthogonal experiment, the effects of formaldehyde / phenol molar ratio (F / P), proportion of lignin substituted phenol, NaOH dosage (NaOH / P molar ratio) and polymerization viscosity on the water- Influence law, optimize the preparation conditions of LPF resin. The results showed that the content of phenolic hydroxyl increased about 17% after laccase was treated by laccase, which reached the goal of activating lignin. The optimized preparation process of activated lignin modified LPF resin was F / P molar ratio 2.0, lignin substitution rate 50%, Na OH / P molar ratio 0.50, polymerization viscosity 100-200mPa · s, and the bonding strength was 1.15MPa. Meet the national standard GB / T 9846.3-2004 Class I plywood requirements, greatly reduce the production cost of phenolic resin, to achieve the efficient use of lignin resources.