不同原料摩尔比对多元共缩聚树脂木材胶黏剂结构与性能的影响  

Structure and Performance of Novel Multi-co-condensed Resin of Melamine-Phenol-Urea-Glyoxal(MPUG)

作　　者：苟倩 刘焕 李泽[1] 董春雷[1] 杜官本[1] 邓书端[1] Gou Qian;Liu Huan;Li Ze;Dong Chunlei;Du Guanben;Deng Shuduan(Yunnan Provincial Key Laboratory of Wood Adhesives and Glue Products,Southwest Forestry University,Kunming Yunnan 650233,China)

机构地区：[1]西南林业大学云南省木材胶粘剂及胶合制品重点实验室,云南昆明650233

出　　处：《西南林业大学学报（自然科学）》2023年第2期153-162,共10页Journal of Southwest Forestry University：Natural Sciences

基　　金：云南省万人计划“产业技术领军”人才专项(80201408)资助;国家自然科学基金项目(31860188)资助;云南省大学生创新创业训练项目资助。

摘　　要：以三聚氰胺(M)、苯酚(P)、尿素(U)、乙二醛(G)为原料,在弱酸性条件下合成了不同原料摩尔比的三聚氰胺–苯酚–尿素–乙二醛(MPUG)多元共缩聚树脂,对树脂的基本性能、润湿性能和胶合性能进行测试,据此优选出共缩聚树脂合成的较佳原料摩尔比;并采用傅里叶变换红外光谱、13C核磁共振波谱及X-射线光电子能谱对树脂结构进行表征。结果表明:M和P的加入能大幅提高树脂的胶合性能特别是耐水性;以原料摩尔比M∶P∶U∶G为0.2∶0.1∶1.0∶1.4的MPUG树脂制备的三层杨木胶合板胶合性能较优,其干状胶合强度、冷水24 h湿强度和63℃热水3 h湿强度分别为1.62、0.75、0.43 MPa,且无甲醛释放,可在干燥状态下直接室内使用。The multi-co-condensed resins of melamine-phenol-urea-glyoxal(MPUG)with different molar ratios of raw materials of melamine(M),phenol(P),urea(U)and glyoxal(G)have been successfully prepared under weak acid conditions.The basic property,wettability and bonding property of the MPUG resins were fully examined,and then the synthetic process of the co-condensed resins was optimized.Fourier transform infrared spectroscopy(FTIR),13C nuclear magnetic resonance spectroscopy(13CNMR)and X-ray photoelectron spectroscopy(XPS)were applied to characterize the resins'structure.The results showed that the addition of M and P improved obviously the bonding performance of UG resin,especially for the water resistance of the plywood.The three-layer poplar plywood bonded with MPUG resin with the molar ratio of raw materials(M∶P∶U∶G)of 0.2∶0.1∶1.0∶1.4 has optimum bonding strength.The dry bonding strength,wet bonding strength in cold water for 24 h and wet bonding strength in 63℃hot water for 3 h are 1.62 MPa,0.75 MPa and 0.43 MPa,respectively.Moreover,the resin and its plywood are of free-formaldehyde emission and can be directly used for indoor under dry condition.

关 键 词：共缩聚树脂 结构 性能 13C核磁共振波谱 X-射线光电子能谱 

分 类 号：S781[农业科学—木材科学与技术]