三聚氰胺-尿素-乙二醛共缩聚树脂的制备、表征与性能分析  

Preparation,Characterization and Performance Analysis of Melamine-Urea-Glyoxal Co-condensed Resin

作　　者：姜鑫 王德龙 汪进文 杜官本[1] 邓书端[1] JIANG Xin;WANG Delong;WANG Jinwen;DU Guanben;DENG Shuduan(Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]云南省木材胶黏剂与胶合板制品重点实验室,西南林业大学,云南昆明650224

出　　处：《林产化学与工业》2023年第6期89-97,共9页Chemistry and Industry of Forest Products

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

摘　　要：采用常温下不挥发的乙二醛(G)替代甲醛与三聚氰胺(M)及尿素(U)进行反应,在保持尿素与乙二醛的物质的量之比为0.30∶1.0不变的条件下,制备了不同三聚氰胺用量(13.86、17.64、21.42和25.20 g)的三聚氰胺-尿素-乙二醛(MUG)共缩聚树脂。对MUG树脂的基本性能、固化性能以及胶合性能进行分析测定,并采用傅里叶变换红外光谱(FT-IR)、质谱(MS)和核磁共振碳谱(13 C NMR)对树脂结构进行表征。研究结果表明:MUG树脂的固含量及黏度受三聚氰胺用量(原料比)的影响较大,二者均随着M添加量的增加而增大;MUG树脂中主要含有N—H、O—H、C O、C—O、C N等官能团,且不同三聚氰胺用量MUG树脂的红外吸收峰无较大变化;根据MS的分子碎片并推断其可能的反应机理,证明了体系中M、U、G这3者之间发生了共缩聚反应。当三聚氰胺用量为21.42 g时,样品MUG-3的固化温度较低,储能模量较高,由其制备的胶合板干状剪切强度、冷水24 h湿强度和热水3 h湿强度均较好,分别为2.51、1.29和0.85 MPa。This paper used non-volatile glyoxal(G)to replace formaldehyde to react with melamine(M)and urea(U)to prepare melamine-urea-glyoxal(MUG)co-condensed resins,at room temperature with the molar ratio of the raw material of U and G was 0.30∶1.0,and with the dosage of M was 13.86,17.64,21.42 and 25.20 g,respectively.The basic properties,curing properties and bonding properties of the MUG resins were determined and analyzed.The structure of the resin was characterized by Fourier transform infrared spectroscopy(FT-IR),mass spectrometry(MS)and nuclear magnetic resonance carbon spectroscopy(13 C NMR).The results showed that the solid content and viscosity of MUG resins were greatly affected by the molar ratio of raw materials,which increased with the increase of M content.The MUG resin mainly contained N—H,O—H,C O,C—O,C N and other functional groups,and the main infrared absorption peaks of MUG resin with different molar ratios of raw materials did not change significantly.The possible reaction mechanism was deduced according to the molecular fragments,proving the co-polycondensation reaction M,U and G in the system.When the amount of melamine added was 21.42 g,the curing temperature of the resin was lower and the storage modulus was higher.For the plywood fabricated by the as prepared resin,the dry bonding strength,wet strength cold water for 24 h and with hot water for 3 h were 2.51,1.29 and 0.85 MPa,respectively.

关 键 词：三聚氰胺-尿素-乙二醛共缩聚树脂 物质的量比 反应机理 胶接强度 

分 类 号：TQ35[化学工程] TQ43