环氧树脂增强尿素-淀粉-乙二醛树脂的结构与性能  

Structure and properties of urea-starch-glyoxal resin reinforced by epoxy resin

作　　者：谢乂坤 王德龙 汪进文 董春雷[1] 孙浩[1] 杜官本[1] 邓书端[1] Xie Yikun;Wang Delong;Wang Jinwen;Dong Chunlei;Sun Hao;Du Guanben;Deng Shuduan(Yunnan Key Laboratory of Wood Adhesives and Glue Products,Southwest Forestry University,Kunming 650224,Yunnan,China)

机构地区：[1]云南省木材胶黏剂及胶合制品重点实验室西南林业大学,云南昆明650224

出　　处：《中国胶粘剂》2022年第9期1-7,共7页China Adhesives

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

摘　　要：为提高尿素-淀粉-乙二醛(USG)木材胶粘剂的性能,本研究采用乙二醛、尿素、氧化木薯淀粉和不同质量分数的环氧树脂制备了环氧树脂改性的USG树脂。对其进行了固含率、黏度、热性能测试,并用其制备三层杨木胶合板,测定了相应性能,最后对其结构特征进行表征。研究结果表明:环氧树脂的添加可增加USG树脂的固含率,但对USG树脂的黏度影响不大;差示扫描量热仪(DSC)测试表明,添加环氧树脂可以降低USG树脂的固化温度;当环氧树脂添加量为2%时,树脂的黏度达593.4 mPa·s,固含率为54.1%,所制备胶合板的干状剪切强度、冷水湿强度及热水湿强度分别为2.11、1.60和0.66 MPa;经过红外光谱仪(FT-IR)、X射线光电子能谱仪(XPS)、核磁共振波谱仪(NMR)等测试表明,环氧树脂的环氧基团与USG树脂长链之间发生了化学反应。In order to improve the properties of urea-starch-glyoxal(USG)wood adhesive,epoxy resinmodified USG resin was prepared by using glyoxal,urea,oxidized cassava starch and epoxy resins with different mass fractions.The solid content,viscosity and thermal properties were tested,and three-layer poplar plywood was prepared with it,the corresponding properties were measured,and finally its structural characteristics were characterized.The research results showed that the addition of epoxy resin could increase the solid content of USG resin,but it had little effect on the viscosity of USG resin.Differential scanning calorimetry(DSC)test showed that the curing temperature of USG resin could be reduced by adding epoxy resin.When the addition amount of epoxy resin was 2%,the viscosity of the resin reached 593.4 mPa·s,the solid content was 54.1%,and the dry shear strength,cold water wet strength and hot water wet strength of the prepared plywood were 2.11,1.60 and 0.66 MPa,respectively.Infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),nuclear magnetic resonance spectroscopy(13C-NMR)tests showed that there occurred a chemical reaction between the epoxy group of epoxy resin and the long chain of USG resin.

关 键 词：尿素-淀粉-乙二醛树脂 环氧树脂 木材胶粘剂 结构与性能 

分 类 号：TQ430.4[化学工程]