摘要
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(rF/P)、氢氧化钠与苯酚物质的量之比值(rNaOH/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,rF/P1.8,rNaOH/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。
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 (rF/P) , ratio of NaOH to phenol (rnaon/p) and resinifieation 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 rFvP 1.8, rNaon/p O. 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 rag/L) was lower than the Eo level set by GB/T 9846 -2004 Plywood.
出处
《生物质化学工程》
CAS
2007年第5期9-12,共4页
Biomass Chemical Engineering
基金
北京市教委与地方共建项目(JD100220534)
948计划资助项目(2006-4-107)
北京林业大学研究生自选课题基金资助项目(05jj086)
关键词
苯酚
酚醛树脂
液化
胶合板
phenol
phenol-formaldehyde resin
liquefaction
plywood