酚醛树脂的改性及其对聚氨酯/金属粘接性能的影响  

Modification of phenolic resin and its effect on adhesive properties of polyurethane/metal

作　　者：易玉华[1] 赵欣苗 YI Yuhua;ZHAO Xinmiao(School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641

出　　处：《复合材料学报》2023年第12期6610-6618,共9页Acta Materiae Compositae Sinica

基　　金：广州市科技计划项目(202102080477)。

摘　　要：为了解决Chemlok218为粘接剂时,室温下聚氨酯(PU)/金属粘接效果差的问题,采用一种高活性的PU改性剂,对Chemlok218中的酚醛树脂(PF)进行改性获得PF@NCO,在Chemlok218涂层与PU间形成一层过渡层,FTIR、TG分析表明:PU改性剂中NCO基团与PF中的羟基反应生成氨基甲酸酯基团。与Chemlok218涂层相比,PF@NCO过渡层表面能提高,与PU相容性增加。当Chemlok218与PU改性剂的质量比为80∶20时,PF@NCO-20的剥离强度达到23.4 kN·m^(-1),比纯Chemlok218提高了58.1%,整个PU/金属粘接试样无粘接薄弱点及缺陷。为解决室温下PU/金属的粘接强度问题提供借鉴。To solve the problem of poor bonding effect of polyurethane(PU)/metal at room temperature when Chemlok218 was used as adhesive,a highly active PU modifier was used to modify phenolic resin(PF)in Chemlok218 to form a PF@NCO transition layer between Chemlok218 coating and PU.FTIR and TG analysis showed that the NCO group in PU modifier reacted with the hydroxyl group of PF to form carbamate group,and the surface energy of PF@NCO could be improved.The compatibility with PU had increased.When the mass ratio of Chemlok218 to PU modifier is 80∶20,the peel strength of PF@NCO-20 reaches 23.4 kN·m^(−1),which is 58.1%higher than that of pure Chemlok218,and the whole PU/metal bonding sample had no bonding weaknesses and defects.The purpose of this paper is to provide a reference for solving the problem of bonding strength of PU/metal at room temperature.

关 键 词：改性 酚醛树脂 聚氨酯 金属粘接 粘接性能 Chemlok218 

分 类 号：TB332[一般工业技术—材料科学与工程]