杉木苯酚液化物合成热固型酚醛树脂的研究

以杉木为研究树种,对比不同料液比(木材与苯酚质量比)液化物与甲醛在碱性环境中反应,进行热固酚醛树脂制备试验。考察不同甲醛与苯酚物质的量之比值(r_F/P)、氢氧化钠与苯酚物质的量之比值(r_NaOH/P)和树脂化温度对树脂理化性能的影响。结果表明,采用料液比为1:2的液化物,r_F/P1.8,r_NaOH/P0.7,树脂化温度 80℃ 条件下合成的杉木液化物树脂压制的杨木三层胶合板满足I类胶合板强度要求,各项物理力学性能与常规PF树脂压制的板材相当,板材的甲醛释放量为 0.1 mg/L,远低于GB/T 9846-2004《胶合板》中的E₀级要求。

Studies on Synthesis of Resol Phenol-formaldehyde Resin from Liquefied Chinese Fir Wood in Phenol

In this study, we aimed to synthesize resol phenol-formaldehyde resin from the liquefied Chinese Fir(Cunninghamia lanceolata) wood in phenol with different ratio of wood to phenol in presence of sulfuric acid as catalyst. The effects of ratio of formaldehyde to phenol (r_F/P), ratio of NaOH to phenol (r_NaOH/P) and resinification temperature on chemical properties of liquefied wood resins (LWR) were investigated. The resol phenol-formaldehyde adhesive could be prepared from liquefied wood (wood:phenol=1:2) in phenol at r_F/P 1.8, r_NaOH/P 0.7 and resinification temperature 80℃.The physical properties of the poplar three-layer plywood bonded with LWR were similar to those with normal PF resins and also satisfied the demands of I level. Free formaldehyde content of plywood (0.1 mg/L) was lower than the E₀ level set by GB/T 9846-2004 Plywood.