核桃壳胶粘剂化学背景的探讨

Approach of the Adhesion Chemical Background of Walnut Shell

探讨漾濞泡核桃壳作木材胶粘剂原料的化学背景。化学分析结果表明:漾濞泡核桃壳中含(硝酸法)纤维素3 3 2 5 %、多戊糖2 6 72 %、木素6 0 94 %、灰分1 1 9%;核磁共振氢谱、紫外和红外光谱的分析结果表明:核桃壳木素以愈疮木基-紫丁香基木素为主,属GS型木素,且G型木素的含量大于S型木素。利用G型阔叶材木素的化学性质可以合成得到与普通酚醛树脂胶合性能相当的核桃壳木素-苯酚-甲醛共聚树脂。

The chemical background of the shell of Yangbi walnut ( Juglans sigillata ) shell for wood adhesive as a raw material was approached in this paper. Results from the chemistry analysis showed, the walnut shell was composed with 33 25% cellulose (by nitric acid), 26 72% pentosan, 60 94% lignin and 1 19% ashes. By means of spectrum analysis of 1H NMR, IR and UV, it was recognized that guai_and syrin_were the main chemical elements of walnut lignin, which belonged to GS lignin, was which G lignin is more than S one. Making use of the chemical properties of G lignin, the walnut shell lignin could be co polymerized with phenol and formaldehyde for wood adhesive whose bonding capability was similar with that of common phenol formaldehyde resin.