环氧树脂增强苯酚−尿素−乙二醛共缩聚树脂的粘接性能研究  

Study on the Bonding Properties of Phenol-urea-glyoxal Copolycondensation Resin Reinforced by Epoxy Resin

作　　者：邓书端[1] 李智[1] 苟倩 茶联红 王婷[1] 杜官本[1] Deng Shuduan;Li Zhi;Gou Qian;Cha Lianhong;Wang Ting;Du Guanben(Yunnan Key Laboratory of Wood Adhesives and Glue Products,College of Materials and Chemical Engineering,Southwest Forestry University,Kunming Yunnan 650233,China)

机构地区：[1]西南林业大学材料与化学工程学院,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）》2024年第6期1-7,F0002,共8页Journal of Southwest Forestry University：Natural Sciences

基　　金：云南省基础研究重点项目(202301AS070043)资助;高等学校学科创新引智计划项目(D21027)资助;杜官本院士工作站(YSZJGZZ−2020052)资助;云南省农林联合重点项目(202401BD070001−029)资助;国家级大学生创新创业训练计划项目资助。

摘　　要：为了改善乙二醛基树脂胶黏剂的胶合性能及耐水性,以环氧树脂(EPR)、苯酚(P)、尿素(U)、乙二醛(G)为原料,合成了一种新型EPR−PUG多元共缩聚树脂胶黏剂,探究树脂的基本性能、固化性能、胶合性能,以确定P/U/G摩尔比对树脂胶黏剂体系性能的影响和树脂胶黏剂的较佳合成配方。通过接触角、傅里叶变换红外光谱(FT−IR)、核磁共振碳谱(13C NMR)和X−射线光电子能谱(XPS)方法分析了共缩聚树脂胶黏剂的结构特征和合成机理。结果表明:原料的官能团之间发生了有效交联反应,分子间形成了致密的网络结构,致使树脂胶黏剂体系整体性能得以提升;在P∶U∶G摩尔比为0.1∶1.0∶1.5、反应pH为4~5、反应温度为70~80℃、反应时间3 h、EPR添加量为13%时,所制备的EPR−PUG共缩聚树脂胶黏剂制备的胶合板性能最佳,干/湿强度分别为2.48 MPa、1.33 MPa(冷水)及0.72 MPa(63℃热水),符合国标对II类胶合板的要求,且无甲醛释放。In order to improve the bonding properties and water resistance of glyoxal-based resin adhesive,a new EPR−PUG multi-component cocondensation resin adhesive was synthesized using epoxy resin(EPR),phenol(P),urea(U)and glyoxal(G)as raw materials.The basic properties,curing properties,and bonding properties of the resins were investigated to determine the effect of P/U/G molar ratio on the properties of the resin adhesive and the optimum synthetic formula.The structure and synthesis mechanism of the EPR−PUG resin adhesive were analyzed by contact angle,fourier infrared spectroscopy(FT−IR),nuclear magnetic resonance carbon spectroscopy(13C NMR)and X-ray photoelectron spectroscopy(XPS).The results showed that the functional groups of the raw materials were crosslinked effectively,and a dense network structure was formed among the molecules,which improved the overall performance of the resin adhesive system.Under the conditions of P/U/G molar ratio of 0.1∶1.0∶1.5,reaction pH of 4–5,reaction temperature of 70–80℃,reaction time of 3 h,and EPR mass fraction of 13%,the adhesive has the best performance.The dry/wet strength was 2.48 MPa,1.33 MPa(cold water),0.72 MPa(63℃hot water),respectively,which meets the requirements of the national standard for class II plywood and does not release formaldehyde.

关 键 词：乙二醛基树脂 共缩聚 无甲醛胶黏剂 粘接性能 

分 类 号：S781.65[农业科学—木材科学与技术]