脲醛树脂/异氰酸酯胶粘剂组合施胶对纤维板性能的影响  

Effects of urea formaldehyde resin/isocyanate adhesive combination sizing on the properties of fiberboard

作　　者：龙慈明 覃掌吉 黎耀健 卿彦[2] 李新功[2] 吴义强[2] 刘明[2] Long Ciming;Qin Zhangji;Li Yaojian;Qing Yan;Li Xingong;Wu Yiqiang;Liu Ming(Guangxi Fenglin Wood Industry Group Co.,Ltd.,Nanning 530221,Guangxi,China;Central South University of Forestry and Technology,Changsha 410004,Hunan,China)

机构地区：[1]广西丰林木业集团股份有限公司,广西南宁530221 [2]中南林业科技大学,湖南长沙410004

出　　处：《中国胶粘剂》2021年第2期8-13,共6页China Adhesives

基　　金：林业科学技术推广项目[(2019)23];湖南省教育厅优秀青年项目(18B181);中南林业科技大学引进人才项目(2018YJ007);南宁市科学研究与技术开发计划项目(20182022)。

摘　　要：使用三聚氰胺改性脲醛树脂与异氰酸酯胶粘剂组合施胶制备纤维板,研究了不同异氰酸酯添加比例对纤维板物理力学性能、防水性能以及甲醛释放量的影响。研究结果表明:异氰酸酯的引入对纤维板的静曲强度和弹性模量并无显著影响;纤维板的内结合强度随着异氰酸酯用量的增加而逐渐增强,当异氰酸酯用量为脲醛树脂固体含量的20%时,其内结合强度可提高至1.77 MPa,相应的24 h吸水厚度膨胀率可降低至4.6%;异氰酸酯的引入对纤维板的甲醛释放量测试结果并不显著,仅从原来的5.08 mg/(100 g)最低降至4.12 mg/(100 g)。Fiberboard was prepared with melamine modified urea formaldehyde resin and isocyanate adhesive combination sizing.The effects of different isocyanate addition ratio on the physical and mechanical properties,waterproof properties and formaldehyde emission of fiberboard were studied.The research results showed that the introduction of isocyanate had no significant effect on the static bending strength and elastic modulus of fiberboard.The internal bonding strength of fiberboard increased with the increase of isocyanate content,when the isocyanate content was 20%of the solid content of urea formaldehyde resin,the internal bonding strength could be increased to1.77 MPa,and the corresponding 24 h water absorption thickness expansion could be reduced to 4.6%.The formaldehyde emission of fiberboard was not significantly affected by the introduction of isocyanate,just decreased from 5.08 mg/(100 g)to 4.12 mg/(100 g).

关 键 词：胶粘剂 纤维板 脲醛树脂 异氰酸酯 

分 类 号：TQ433[化学工程]