封闭型聚氨酯预聚体共混改性MUF树脂特性研究  

Study on properties of modified MUF with blocked polyurethane prepolymer addition

作　　者：蒋军[1] 崔举庆[1] 那斌[1] 王志强[1] 陈敏智[1] 张海洋[1] 罗海[1] 任少波[1] 薛海龙[1] 李智声 卢晓宁[1] 

机构地区：[1]南京林业大学材料科学与工程学院,江苏南京210037

出　　处：《中南林业科技大学学报》2016年第3期106-110,共5页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项项目(201104042);江苏省苏北科技发展计划项目(BC 20122415);江苏省科技计划项目(BY2013006-02)

摘　　要：本文通过合成封闭型聚氨酯预聚体(BPUP)对MUF树脂进行共混改性处理,研究了-NCO/-OH(R值)及预聚体添加量对共混胶粘剂胶合性能的影响;并探讨了基材含水率对共混胶粘剂润湿性的影响规律。结果表明:随着R值增加,共混胶粘剂的粘度、p H值和干湿强度均呈增加趋势,接触角整体呈下降趋势;随着BPUP添加量增加,共混胶粘剂的干、湿胶合强度和木破率明显提高;随着基材含水率的增加,初接触角减小,平衡接触角增大,胶粘剂在基材表面的扩散-渗透速率降低,润湿性减弱。The properties of modified MUF with blocked polyurethane prepolymer addition was investigated to study the influence of R value and different addition amount of BPUP on bonding performance while get the wettability of modified adhesive in different moisture content condition. The results showed that with the increasing R value, the viscosity, p H and dry/wet strength got a certain degree of increase while the contact angle presented the decreasing tendency. With the increasing addition of BPUP, a considerable improvement of blending adhesive in dry/wet strength was discovered. With the increase of moisture content, the smaller the initial contact angle was found while the bigger the balance contact angle was discovered. And the diffusion- penetration rate of modified MUF on the surface of the materials was reduced.

关 键 词：封闭型聚氨酯 含水率 共混改性 润湿性能 胶合性能 

分 类 号：S781.65[农业科学—木材科学与技术]