脲醛树脂胶黏剂预压性能调控  

Enhancement of pre-pressing performance of urea formaldehyde resin adhesive

作　　者：梁杰培 胡星隆 李如恩 仇亚成 周松鹤 杨昇 范东斌[3] LIANG Jiepei;HU Xinglong;LI Ruen;QIU Yacheng;ZHOU Songhe;YANG Sheng;FAN Dongbin(Guangxi Forestry Industrial Co.Ltd.,Nanning 533000,China;Guangxi Guoxu Dongteng Wood based Panel Co.Ltd.,Wuzhou 543300,China;Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]广西森工集团股份有限公司,南宁533000 [2]广西国旭东腾人造板有限公司,梧州543300 [3]中国林业科学研究院木材工业研究所,北京100091

出　　处：《林业工程学报》2024年第5期61-66,共6页Journal of Forestry Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2020MB001)。

摘　　要：脲醛树脂是我国人造板主要用胶,用于胶合板生产时,其施胶板坯的预压成型性能对胶合板加工过程至关重要,一定程度决定了板材生产效率。为保障人造板产品的环保性,低甲醛物质的量比环保型改性脲醛树脂被普遍采用,此类胶黏剂预压成型性不佳,需针对性探索预压性能高效提升技术。本研究提出通过在脲醛树脂分子结构中嵌入酚型物质实现胶黏剂预压性能调控的方法,探索酚型物质结构及添加量对脲醛树脂预压性能的贡献效果及贡献机制,并分析其对脲醛树脂性质及主要性能的影响。研究结果表明,酚型物质添加量小于1%即可有效改善脲醛树脂胶黏剂的预压性能,且胶黏剂预压性能随酚型物质中酚羟基含量增加而提升。1 h预压条件下,添加相同物质的量苯酚、邻苯二酚及邻苯三酚制备的改性脲醛树脂胶黏剂预压强度相对于UF(对照)分别提升44.74%,100.00%及113.16%。酚羟基与胶液组分间形成的氢键作用是脲醛树脂胶黏剂预压性能改善的主要原因。本研究为解决低甲醛物质的量比脲醛树脂预压成型性能差的问题提供了可行的科学基础及技术参考。Urea formaldehyde resin is the main adhesive used for fabricating wood-based panels in China.The pre-pressing performance of this adhesive is crucial to the manufacture of plywood,which determines the production efficiency to a certain extent.In earlier years,urea formaldehyde resins were typically prepared through high formaldehyde molar ratio formula.Bonding performance of the products is the most critical indicator.To ensure the environmental friendliness of artificial boards,modified urea formaldehyde resin has generally been manufactured based on a low formaldehyde molar ratio formula.The pre-pressing performance of this adhesive is weaker than that of traditional urea formaldehyde resin.Therefore,it is necessary to explore efficient techniques to improve the pre-pressing performance of low formaldehyde molar ratio adhesives.The purpose of this study was to improve pre-pressure efficiency of glued slab by inserting phenolic substances into the molecular structure of urea formaldehyde resins.The contribution effect and mechanism of the molecular structure and dosage of phenolic substances to the pre-pressing performance of urea formaldehyde resin were investigated.The results of the study on the impact of the phenolic substances on the properties and main performances of urea formaldehyde resin showed that the pre-pressing performance of urea formaldehyde resin can be improved significantly by inserting phenolic structure into the resin molecules.The per-pressing performance of the adhesive improved with the increase of hydroxyl content in phenolic substances.An improvement of the per-pressing performance of the urea formaldehyde resin adhesive was found when phenolic substances added at an amount less than 1%.After 1 h cold-pressing treatment,the pre-pressing strength of the modified urea formaldehyde resin adhesive prepared by adding the same amount of phenol,catechol and pyrogallol increased by 44.74%,100.00%,and 113.16%,respectively,compared to control adhesive.The hydrogen bonding between phenolic hydrox

关 键 词：脲醛树脂胶黏剂 胶合板 预压成型 羟基 氢键 

分 类 号：S785[农业科学—林学]