漆酶活化碱木质素合成酚醛树脂的研究

Study on phenol-formadehyde resin modified by laccase-activated alkali lignin

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 straw alkali lignin was activated by the laccase pretreatment and its products for the synthesis of phenolformaldehyde resin（LPF）. Preparation conditions of LPF resin were optimized by studying the effects of molar ratio of formaldehyde to phenol, substitution ratio of lignin to phenol, dosage of sodium hydroxide, and polymerization viscosity on the bonding strength of the resins, through multi factor orthogonal experiment. The results showed that the phenol hydroxyl content increased by about 17%, to achieve the purpose of activating lignin. The optimized LPF resin preparation processes were F/Pmolar ratio of 2.0, lignin replacement rate of 50%, Na OH/P molar ratio of 0.50, and polymerization viscosity with 100-200 m Pa·s, with the bonding strength of 1.15 MPa, which meet the national standards GB/T 9846.3-200. The obtained results will reduce the production cost of phenolic resin, and achieve the efficient use of lignin resources.