淀粉基水性异氰酸酯木材胶黏剂老化机理研究  

Retrogress mechanism of starch-based aqueous polymer isocyanate adhesive

作　　者：时君友[1,2] 王垚[1] 

机构地区：[1]北华大学木材科学与工程系,吉林132013 [2]清华大学化学工程系,北京100084

出　　处：《南京林业大学学报（自然科学版）》2010年第2期81-84,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：科技部农业转化资金项目(2007GB2B10078);吉林省科技发展计划重点项目(20060401-2);国家重点基础研究计划(2004CB719706)

摘　　要：将淀粉基水性异氰酸酯木材胶黏剂用于结构胶合木的胶接并进行加速老化处理,通过Ra-man、13C-NMR及GPC分析老化过程中发生的化学及物理变化,以揭示该胶黏剂老化机理。结果表明:在胶膜加速老化过程中异氰酸酯基发生了化学反应,有胺生成随后又分解,而与聚异氰酸酯(PMDI)交联的复合变性淀粉的结构未见改变。加速老化后的胶黏剂中聚乙烯醇(PVA)的高分子链被切断,形成低分子溶于水中,而其他成分没有溶出与降解。Starch-based aqueous polymer isocyanate adhesive was used to bond the structural laminated lumber. Then it was retrogressed accelerative by boiling treatment. The chemical and physical changes in the aging process were analyzed by means of Raman, 13C-NMR and GPC to reveal the retrogress mechanism. The results showed that the reaction of -NCO group occurred in the bonding film in the process of retrogress, i.e., the amine compounded firstly and then decompounded. But there was no change in the modified starch linked to the polymer isocyanate （PMDI）. After the accelerated retrogression, the chains of polyvinyl alcohol （PVA） in the adhesive were cut into small molecules dissolving in water. Other components did not dissolve or degrade.

关 键 词：淀粉基水性异氰酸酯 胶黏剂 老化机理 

分 类 号：TQ352[化学工程]