温湿耦合老化对改性硅烷密封胶与PC粘接性能的影响  

Effect of temperature-humidity coupling aging on bonding performance of modified silane sealant with PC

作　　者：张静 王浩 徐智宝 杨洋 倪强 郑自芹 梁景恒 Zhang Jing;Wang Hao;Xu Zhibao;Yang Yang;Ni Qiang;Zheng Ziqin;Liang Jingheng(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,Shandong,China;Yantai Branch of China Ordnance Industry No.52 Research Institute Co.,Ltd.,Yantai 264003,Shandong,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,山东青岛266111 [2]中国兵器工业第五二研究所烟台分所有限责任公司,山东烟台264003

出　　处：《中国胶粘剂》2023年第7期33-39,共7页China Adhesives

摘　　要：利用环境模拟试验箱、万能拉伸试验机、红外光谱仪、接触角测量仪和光学显微镜等设备,研究了温湿耦合老化(70℃/100%RH)环境对改性硅烷密封胶与轨道车辆车窗&灯罩用聚碳酸酯(PC)粘接性能的影响。研究结果表明:温湿耦合老化后改性硅烷密封胶与灯罩用PC之间的粘接性下降明显,胶条剥离破坏形式从95%以上内聚破坏变为95%以上界面黏附破坏,拉剪强度降低93%以上,而车窗用试样老化后性能降低幅度较灯罩用试样小。温湿耦合老化后,灯罩用PC底涂与UV涂层之间存在起泡现象,这是灯罩用PC粘接性能降低的主要诱因。此外,高温加速了PC中酯类结构的水解,也可能是粘接性能降低的原因之一。The effect of temperature-humidity coupling aging(70℃/100%RH)environment on the bonding performance of modified silane sealant with polycarbonate(PC)used for rail vehicle window&lampshade were investigated by using environmental simulation test chamber,universal tensile tester,infrared spectrometer,contact angle meter and optical microscope.The research results showed that after temperature-humidity coupling aging,the bonding performance between modified silane sealant and PC used for lampshade decreased significantly.The form of adhesive strip peeling failure changed from more than 95%cohesive failure to more than 95%interfacial adhesion failure,and the tensile shear strength decreased by more than 93%.However,the performance reduction of the car window sample after aging was smaller than that of the lampshade sample.After temperature-humidity coupling aging,there was foaming phenomenon between the PC primer and UV coating used for lampshade,which was the main reason for the decrease in the bonding performance of PC used for lampshade.In addition,high temperature accelerated the hydrolysis of ester structures in PC,which may also be one of the reasons for the decrease in bonding performance.

关 键 词：温湿耦合老化 改性硅烷密封胶 PC 粘接性能 界面开裂 

分 类 号：TQ436.6[化学工程]