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Uv Absorbance Method For Coatings Cure Determination 涂料固化测定的紫外吸收法
发布日期: 1992-06-01
目前,紫外(UV)分光光度法程序用于测定啤酒和饮料罐及端部环氧基涂料组合物的相对固化度。该方法已成功地在喷涂在铝罐和钢罐上的丙烯酸环氧水性涂料薄膜上进行了测试,目前已建立用于监测喷涂在铝卷上的溶剂基端涂层的固化情况。固化度的测定基于用标准体积的四氢呋喃(THF)溶剂从薄膜中提取的含有芳香环的组分的量。根据280纳米处的吸光度,通过浓度与吸光度的标准曲线图确定提取物的相对浓度。导出的数字与胶片性能相关。
AN ULTRA VIOLET (UV) SPECTROPHOTOMETRIC PROCEDURE IS CURRENTLY USED TO DETERMINE THE RELATIVE CURE OF EPOXY-BASED COATING COMPOSITIONS FOR BEER AND BEVERAGE CANS AND ENDS. THE METHOD HAS BEEN SUCCESSFULLY TESTED ON FILMS OF ACRYLATED EPOXY WATERBORNE COATINGS SPRAY APPLIED OVER ALUMINUM AND STEEL CANS, AND HAS NOW BEEN ESTABLISHED TO MONITOR THE CURE OF SOLVENT-BASED END COATINGS APPLIED OVER ALUMINUM COILS. THE DETERMINATION OF THE DEGREE OF CURE IS BASED ON THE AMOUNT OF THE AROMATIC RING CONTAINING COMPONENTS WHICH ARE EXTRACTED FROM THE FILM WITH A STANDARD VOLUME OF TETRAHYDROFURAN (THF) SOLVENT. FROM THE ABSORBANCE AT 280 NANOMETERS, THE RELATIVE CONCENTRATION OF THE EXTRACT IS ESTABLISHED FROM A STANDARD GRAPH OF CONCENTRATION VERSUS ABSORBANCE. THE NUMBERS DERIVED ARE CORRELATED TO FILM PERFORMANCE PROPERTIES.
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发布单位或类别: 日本-日本船用装置工业会
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