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首页> 外文期刊>Journal of Applied Polymer Science >Effect of lamp cycling on conversion and stress development in ultraviolet-cured acrylate coatings
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Effect of lamp cycling on conversion and stress development in ultraviolet-cured acrylate coatings

机译：灯周期对紫外线固化丙烯酸酯涂料转化和应力发展的影响

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摘要

In radiation-cured acrylate coatings, a high conversion of monomer is generally desired to improve hardness, prevent further slow reaction upon aging, and avoid surface toxicity; however, shrinkage and, consequently, stress in coatings tend to increase with conversion. One route to achieve high conversion while maintaining low coating stress is to promote stress relaxation. In this study, acrylate coatings were cured with a UV lamp that was cycled on and off, varying the period from 2 to 60 min while keeping the total dose constant. All samples reached nearly the same conversion, between 46 and 48% conversion of functional groups, as measured by FTIR spectroscopy. The coating stress (measured with cantilever deflection) at the end of the exposure cycles, however, was lowered from 8 MPa (tension) to less than 3 MPa (tension) as the period was decreased from 60 to 2 min. The cycling had no significant effect on either the coating hardness or the modulus, as measured by a Hysitron triboscope. Stress relaxation and/or slower reaction during the dark periods are the likely causes for the lower coating stress. It was advantageous to introduce dark periods early in the processing. (C) 2002 Wiley Periodicals, Inc. [References: 42]
机译：在辐射固化的丙烯酸酯涂料中，通常需要高单体转化率，以提高硬度，防止老化时进一步缓慢反应并避免表面毒性。然而，随着转化率的增加，涂层的收缩率以及随之而来的应力趋于增加。在保持低涂层应力的同时实现高转化率的一种途径是促进应力松弛。在这项研究中，丙烯酸酯涂料用紫外线灯固化，该紫外线灯可循环打开和关闭，在2到60分钟之间变化，同时保持总剂量不变。通过FTIR光谱测量，所有样品均达到几乎相同的转化率，官能团的转化率为46％至48％。然而，随着时间从60分钟减少到2分钟，在暴露循环结束时的涂层应力（用悬臂挠度测量）从8 MPa（张力）降低到小于3 MPa（张力）。通过Hysitron摩擦镜测量，循环对涂层硬度或模量均无显着影响。在黑暗时期应力松弛和/或反应较慢可能是导致涂层应力降低的原因。在处理的早期引入暗期是有利的。 （C）2002 Wiley Periodicals，Inc. [参考：42]

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