...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of coatings technology and research >Confocal Raman microscopy study of the melamine distribution in polyester-melamine coil coating
【24h】

Confocal Raman microscopy study of the melamine distribution in polyester-melamine coil coating

机译：共聚焦拉曼显微镜研究聚酯-三聚氰胺卷材涂料中三聚氰胺的分布

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Hexamethoxymethylmelamine, a common crosslinker used in combination with polyester resins to prepare thermosetting coatings, can self-condense during curing and in theory build up regions with high crosslink density (melamine enrichment). This distribution may affect such properties as the "local" glass transition temperature and structural heterogeneity and thereby modify formability, stain resistance, and weatherability. The self-condensation regions have not previously been observed in detail so their distribution in the film is unclear. Confocal Raman microscopy (CRM) has been used to characterize the melamine distribution in three polyester-melamine paint systems: one clear and two pigmented coil coatings. Both the surface mapping and depth profiling features of CRM were used to perform a 3D analysis. The depth profiling of the clear coating was performed in a nondestructive way, but due to the opaque nature of the pigments, cross sections of the pigmented coatings were prepared in order to facilitate the analysis of the melamine distribution through the film thickness. Melamine-enriched zones were found on the surfaces of all three samples. They appeared to be approximately spherical with diameters of around 5 μm. It was also observed from the cross sections that the melamine-enriched zones appeared as "particles" distributed randomly through the coating. The Raman spectra collected at these regions show significantly higher triazine ring band intensity. All of these findings confirm the hypotheses constructed over the past 20-30 years.
机译：六甲氧基甲基三聚氰胺是一种常见的交联剂，可与聚酯树脂结合使用以制备热固性涂料，可在固化过程中自凝，理论上可形成具有高交联密度（三聚氰胺富集）的区域。这种分布可能影响诸如“局部”玻璃化转变温度和结构异质性的性质，从而改变可成形性，耐污性和耐候性。以前没有详细观察到自冷凝区域，因此不清楚它们在膜中的分布。共焦拉曼显微镜（CRM）已用于表征三种聚酯-三聚氰胺涂料体系中的三聚氰胺分布：一种透明涂料和两种着色卷材涂料。 CRM的表面贴图和深度轮廓分析功能均用于执行3D分析。透明涂层的深度剖析是以非破坏性的方式进行的，但是由于颜料的不透明性，制备了有色涂层的横截面，以便于分析整个膜厚度的三聚氰胺分布。在所有三个样品的表面上均发现了富含三聚氰胺的区域。它们似乎是近似球形的，直径约为5μm。从横截面还观察到，富含三聚氰胺的区域表现为“颗粒”，随机分布在涂层中。在这些区域收集的拉曼光谱显示出明显更高的三嗪环带强度。所有这些发现证实了在过去20-30年中构造的假设。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号