高性能环保型木质素基酚醛胶粘剂的制备  

Preparation of Lignin-based Polyphenol-formaldehyde Adhesive with Environment-friendly Property and Higher Performance

作　　者：方红霞[1] 吴强林[1] 习小威[1] 吴计付[1] 

机构地区：[1]黄山学院应用化学研究所,黄山245041

出　　处：《复旦学报（自然科学版）》2009年第3期295-300,共6页Journal of Fudan University：Natural Science

基　　金：安徽省教育厅自然科学研究资助项目(KJ2008B280);黄山市科技计划资助项目(2007ZG-12)

摘　　要：采用酚化技术制备了低成本和低游离酚、醛的木质素基酚醛胶粘剂(LPF).利用单因素实验法,探讨了加料方式对传统酚醛树脂(PF)胶粘剂游离酚、醛的影响;实验考察了酚化木质素以及用木质素酚化产物代替苯酚制备LPF胶的影响因素,优化得到高性能环保型LPF的配方工艺;并采用红外光谱测试了木质素在酸催化条件下酚化改性后的结构变化.结果表明,木质素分子在酚化条件下发生降解,通过酚化反应羟基含量显著提高,并产生了新的具有不同取代基的苯环结构;以苯酚为液化试剂,用浓盐酸作催化剂、浓盐酸用量为3%、液化温度为120℃、液化时间为10 min、酚木比为2∶1,酚化得到的木质素酚化液,在酚醛比为1∶1.8时,甲醛分3次加入、碱液分2次加入,制备得到的LPF具有比传统PF更低的游离酚、醛含量、优异的胶合性能和储存稳定性.Low cost lignin-based phenol-formaldehyde adhesive with low free phenol and formaldehyde was synthesized by using phenofication technology. The influence of different adding types of materials on the value of free phenol and formaldehyde was discussed firstly by means of single factor experiments. The effects of the reaction parameters on the value of free phenol, free formaldehyde and adhesive strength were further studied and the reaction parameters were optimized. The structural modification of lignin via phenolation was studied by Fourier transform infrared （FTIR） spectroscopy. The FTIR spectra showed that there are more OH^- functional groups and new substitutes being produced during the phenolic process of lignin. The optimum processing parameters are as follows： the weight rate of phenol/lignin is 2/1; liquefied temperature is 120 ℃ ; liquefied time is 10 min; acid catalyst is hydrochloric （37 % ） ; the mole rate of phenol （amount of phenol and lignin） /formaldehyde is 1 ： 1. 8; adding formaldehyde by three times; adding sodium hydroxide by two times. Compared with the traditional PF, the resultant lignin-based adhesive has lower free phenol and formaldehyde, good glue strength and better stability as well.

关 键 词：低游离酚醛 酚醛胶 木质素 酚化 性能 

分 类 号：TQ433[化学工程]