| 引用本文: | 张旋,钟艳莉,颜悦.聚碳酸酯表面铬酸预处理对涂层附着性能影响[J].材料科学与工艺,2019,27(2):29-35.DOI:10.11951/j.issn.1005-0299.20170450. |
| ZHANG Xuan,ZHONG Yanli,YAN Yue.Adhesion properties of anti-scratch coatings deposited on chromic acid-modified polycarbonate substrates[J].Materials Science and Technology,2019,27(2):29-35.DOI:10.11951/j.issn.1005-0299.20170450. |
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| 摘要: |
| 聚碳酸酯材料表面呈惰性，不利于涂料的完全润湿和界面化学键的结合.为增强聚碳酸酯材料表面的涂层流平性能和附着性能，本文利用铬酸湿化学方法对聚碳酸酯透明材料进行表面预处理，测试预处理前后聚碳酸酯的表面能、元素组成、表面形貌以及应力-溶剂银纹，研究预处理对聚碳酸酯表面性能的影响.结果表明，铬酸的强氧化作用使聚碳酸酯表面产生了羰基、磺酸基及羧基3种含氧极性基团，增加了基材表面粗糙度和润湿性能.通过拉开法和涂层/基材界面扫描电镜两种方法比较了铬酸预处理对耐磨涂层附着性能的影响，研究发现，受涂层与PC之间界面共价键及机械锚接作用力，预处理后涂层附着性能明显增强.涂层附着力与铬酸处理时间密切相关，而较长时间处理会降低PC表面抗应力-溶剂银纹性能，实验表明在不损失材料抗银纹性能前提下，铬酸预处理5 min可以显著提高涂层附着力. |
| 关键词: 耐磨涂层 铬酸预处理 附着力 聚碳酸酯 表面性能 |
| DOI：10.11951/j.issn.1005-0299.20170450 |
| 分类号:TB304 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51702305). |
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| Adhesion properties of anti-scratch coatings deposited on chromic acid-modified polycarbonate substrates |
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ZHANG Xuan1,2, ZHONG Yanli1,2, YAN Yue 1,2
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(1.Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2.Beijing Engineering Research Center of Advanced Structural Transparencies to the Modern Traffic System, Beijing 100095, China)
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| Abstract: |
| The surface of polycarbonate is inert, which is not conducive to the surface wetting of the coating and the interfacial combination of chemical bonds. To improve the surface wetting and interfacial adhesion in coating deposition on polycarbonate (PC), the surface of polycarbonate was modified by chromic acid etching and the influence of chromic acid etching on PC was discussed through the examination of surface properties in terms of the wettability, morphology, elemental compositions, and stress-solvent craze properties. Results revealed the surface roughness increased and the wettability decreased because of three kinds of reactive groups (C O, —SO3H and—COOH) after activation. Adhesion properties of antiscratch coatings on PC after etching were further studied by scanning electron microscopy and pulling-off tests. Results revealed the adhesion between coatings and PC greatly increased, which was attributed to more covalent bonds and mechanical anchoring at coating-substrate interface. Moreover, the adhesion force increased with the activation time, but longer time decreased the craze resistance. Coatings deposited on PC with 5 min activation presented an improved adhesion without loss of craze resistance. |
| Key words: anti-scratch coatings chromic acid modified adhesion force polycarbonate surface properties |
