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    表面处理工艺对聚碳酸酯与聚氨酯密封胶黏接性能的影响

    Effect of Surface Treatment on Adhesive Properties of Polycarbonate and Polyurethane Sealant

    • 摘要: 采用常压空气等离子处理技术、砂纸打磨、涂覆底涂剂等方法对聚碳酸酯(PC)进行表面处理,对PC表面的接触角、官能团、微观形貌、化学元素等进行表征,以聚氨酯密封胶为胶黏剂结合剥离失效形貌和拉伸剪切试验,研究了不同表面处理对PC表面黏接性能的影响。结果表明:与未进行表面处理相比,等离子处理后PC表面与水、乙二醇的接触角均减小,表面极性含氧官能团含量增加,表面润湿性提升,表面失效模式与砂纸打磨处理相同仍为界面黏附失效,这2种表面处理的拉伸剪切强度均略有提高,黏接性能未有明显提升;底涂处理后表面形貌由未表面处理时的纳米级沟状凹坑转变为较光滑的水波状表面,表面水接触角略有减小,表面极性含氧官能团含量增加,表面失效模式转变为胶黏剂内聚失效,拉伸剪切强度提高了约13倍,黏接性能明显提升。

       

      Abstract: Surface treatment of polycarbonate (PC) was carried out by atmospheric air plasma treatment technology, sandpaper grinding and coating primer. The contact angle, functional groups, micromorphology and chemical elements of PC surface were characterized, and polyurethane sealant was used as adhesive, combined with peel failure morphology and tensile shear test. The influence of different surface treatments on the surface bonding properties of PC was studied. The results show that compared with no surface treatment, the contact angle between PC surface and water and ethylene glycol was decreased after plasma treatment, the content of polar oxygen functional groups on the surface was increased, the surface wettability was improved, the surface failure mode was the same as sanding treatment, and it is still the interface adhesion failure. The tensile shear strength of the two surface treatments was slightly improved, and the bonding property was not significantly improved. After primer coating treatment, the surface morphology changed from the nano-scale grooving pits without surface treatment to the smooth surface of water wave, and the surface water contact angle decreased slightly, the surface polar oxygen-containing functional group content increased, the surface failure mode changed to adhesive cohesion failure, the tensile shear strength increased by about 13 times, and the bonding property was significantly improved.

       

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