碱木质素-酚醛复合胶黏剂在竹胶板中的应用研究

Applications of Alkali Lignin/Phenol-formaldehyde Resin in Bamboo Plywood

采用羟甲基化碱木质素(HKLF)与酚醛树脂(PF)复合制备碱木质素-酚醛复合胶黏剂(KPF),研究了HKLF添加量对KPF性能的影响,并分析其在竹胶板中应用的可行性。结果表明:HKLF添加量为10%～30%的KPF生产的竹胶板性能优异,其静曲强度及其弹性模量、吸水厚度膨胀率及胶合强度等物理力学性能均符合LY/T 1574-2000《混凝土模板用竹材胶合板》标准的B类竹材胶合板要求,与纯酚醛胶所制竹胶板的胶合性能相当,且对竹材浸胶量影响较小。HKLF添加量为40%时,竹胶板干状横向静曲强度和吸水厚度膨胀率不达标。因此,HKLF添加量为10%～30%的KPF作为竹胶板用胶黏剂是可行的。

The lignin-phenol-formaldehyde resin adhesive（KPF） was prepared by blending phenol-formaldehyde resin（PF） with alkali lignin modified by hydroxymethylation（HKLF）.Effect of amount of lignin on performance of bamboo plywood was studied.The feasibility of alkali lignin-phenol-formaldehyde resin used in bamboo plywood was analyzed.The results showed that mechanical properties of bamboo plywood,such as modulus of rupture,modulus of elasticity,thickness swelling rate and bonding quality,met the standards of LY/T 1574-2000,when dose of hydroxymethylated lignin was 10 % to 30 %.Performance of bamboo plywood with KPF is almost the same as that of other similar products with PF.However,when dose of hydroxymethylated lignin was 40 %,modulus of rupture and thickness swelling rate did not meet standards.Therefore,KPF can be applied to bamboo plywood when dose of hydroxymethylated lignin was 10 % to 30 %.