纳米二氧化锰改性脲醛树脂胶黏剂试验  

Modification of urea-formaldehyde resin by nano MnO

作　　者：宋佳璇 田珩[1] 雷洪[1] 徐高翔 王镜淞 普蕾 陈庆 SONG Jiaxuan;TIAN Heng;LEI Hong;XU Gaoxiang;WANG Jingsong;PU Lei;CHEN Qing(Yunnan Key Laboratory of Wood Adhesives and Glue Products,International Joint Research Center for Biomass Materials,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学云南省木材胶粘剂及胶制品重点实验室,生物质材料国际联合研究中心,昆明650224

出　　处：《林业工程学报》2022年第2期91-96,共6页Journal of Forestry Engineering

基　　金：云南省基础研究计划(2019FA012);国家自然科学基金(31870546)。

摘　　要：脲醛(UF)树脂胶黏剂是人造板和木制家具行业应用最广泛的胶黏剂之一,其缺点是耐水性差、游离甲醛含量高等。因此,如何降低其人造板的甲醛释放量问题一直以来都是研究的重点。采用经氧化法合成的纳米MnO_(2)改性UF树脂,探究了不同添加量的纳米MnO_(2)对UF树脂性能及所制胶合板甲醛释放量和胶合强度的影响。借助傅里叶红外光谱仪分析改性前后树脂的结构变化,使用动态热机械分析仪分析改性前后树脂的热机械性能。结构分析结果表明:纳米MnO_(2)的加入可以促进树脂的缩聚程度,且不改变树脂体系中主要的官能团结构。热机械分析结果显示:纳米MnO_(2)改性后的胶黏剂具有更高的储能模量和更快的固化速度。此外,胶合板测试结果表明:纳米MnO_(2)的加入可有效提高树脂的胶合强度,降低板材的甲醛释放量。测试范围内,当纳米MnO_(2)的加入量为1.5%(占UF树脂的固体含量)时,树脂的胶合强度最优。其中,干强度提升了58.0%,湿强度提升了41.7%,板材的甲醛释放量从1.640降低至0.365 mg/L,降幅为77.7%,达到中国林产工业协会团体标准《人造板甲醛释放限量》(T/CNFPIA 1001—2019)中E_(0)级(≤0.4 mg/L)板材的要求。Adhesives are important raw materials in the wood-based panel industry,which directly affect and determine the quality of the final glued products.Urea-formaldehyde(UF) resin is the most widely used adhesive in the wood composites and wooden furniture industry due to its low cost and good bonding performance.However,accumulating evidence suggests that the UF resin has serious drawbacks such as poor water resistance and high content of free formaldehyde.As well known,formaldehyde-based adhesives have formaldehyde emission issues,which seriously threatens human health.What’s more,another shortcoming of UF resin is the sustainability problem arising from the use of non-renewable fossil-based resources as raw materials.As the formaldehyde emission standards have been become more and more strict recently,in many kinds of research about UF,the hottest topic is to reduce the formaldehyde emission of wood panels manufactured by UF resins.In this study,nano MnO_(2)that synthesized by the oxidation method was used to modify UF resin.The effect of the nano MnO_(2)content on the properties of the UF resin,formaldehyde emission,and the bonding strength of plywood were discussed.In order to explore the mechanism of the reaction between nano MnO_(2)and UF resin,with the help of related analyses by instrument.For example,the Fourier transform infrared spectrometer(FT-IR) was used to analyze the structural changes of the resins,and the dynamic thermomechanical analyzer was used to analyze the thermomechanical properties of the resins.The structural analysis of FT-IR showed that the addition of nano MnO_(2)could promote the degree of condensation of the resin and did not change the structure of the main functional groups in the resin system.Besides,the results of thermal and mechanical properties analyses showed that the modified adhesive by nano MnO_(2)had high energy storage modulus and faster curing speed.At the same time,the plywood test results indicated that nano MnO_(2)could effectively decrease the formaldehyde emission

关 键 词：脲醛树脂 纳米二氧化锰 甲醛释放量 胶合强度 

分 类 号：TQ323.3[化学工程—合成树脂塑料工业]