Synthesis, performance and structure characterization of glyoxal-monomethylolurea-melamine (G-MMU-M) co-condensed resin  

作　　者：Haixiang Liu Jun Zhang Chunlei Dong Gang Zhu Guanben Du Shuduan Deng 

机构地区：[1]Yunnan Key Laboratory of Wood Adhesives and Glue Products,Southwest Forestry University,Kunming 650224,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第7期92-104,共13页中国化学工程学报（英文版）

基　　金：National Natural Science Foundation of China(31860188);Special Project of“Leading Talents of Industrial Technology”of Yunnan Ten Thousand Talents Plan(80201408);Yunnan Agricultural joint project(202101BD070001-105)are acknowledged.

摘　　要：In order to reduce the formaldehyde emission of formaldehyde-based wood adhesive from the source,it is aimed to develop a novel co-condensed resin of glyoxal-monomethylolurea-melamine(G-MMU-M).A series of G-MMU-M resins with various formulations of raw materials were successfully prepared.The basic properties and bonding performance of the G-MMU-M resins were determined.Furthermore,the structures of resins were characterized by FTIR,^(13)C NMR,XPS,and ESI-MS.The results show that the prepared G-MMU-M resin remains stable for 30 d,meanwhile,the dry and wet bonding strength of the plywoods bonded with the resins,solid content and viscosity are influenced greatly by the addition amount of melamine and MMU/G molar ratio.The G-MMU-M resins with MMU/G molar ratio of 0.9:1.0 and 8% melamine exhibit the highest dry and bonding strength of 1.98 MPa and 1.27 MPa,increased by 34% and 63%,respectively,in comparison with glyoxal-monomethylolurea(G-MMU)resin.In the G-MMU-M resins,there were four main oligomers including M—CH(—^(+)CH-MMU)-O-MMU,M-CH(—CH_(2)OH)-MMU-O-MMU,M—CH(—OH)—^(+)CH-MMU-O-MMU,and M—CH(—^(+)CH-MMU)-MMU-p-G.

关 键 词：Wood adhesive Glyoxal-monomethylolurea-melamine SYNTHESIS Chemical reaction Measurement Structure 

分 类 号：TQ323[化学工程—合成树脂塑料工业] TQ433.4