Copper resinate: preparation, characterisation and study of degradation.
Copper resinate: preparation, characterisation and study of degradation.
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树脂酸铜：制备、表征和降解研究。
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Rizzi
中科院分区：
文献类型：
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作者：
M. Colombini;G. Lanterna;A. Mairani;M. Matteini;F. Modugno;M. Rizzi
本文介绍了一种合成树脂酸铜的方法，它在十八世纪从艺术家的调色板上消失了。这是通过遵循科学方法解释古代食谱来进行的。使用傅立叶变换-红外光谱法和气相色谱-质谱法对其进行的表征表明，它是一种含有铜和氧化松香酸的混合物，主要是脱氢松香酸和7-氧代-脱氢松香酸，在颜料的制备和油漆层的固化过程中形成。研究了树脂酸铜漆层的组成，通过在365 nm（UV）下的紫外线照射（UV）、加热（T）和在气候室中暴露于大气污染物（NOX）进行人工老化。照射和温度的组合产生颜色的变化，沿着7-氧代-脱氢枞酸的回收量的显著增加。从一幅旧画的样品中鉴定树脂酸铜应与下列树脂化合物的存在有关，这些化合物在老化过程中是稳定的：脱氢松香酸和7-氧代脱氢松香酸海松二烯酸。与铜配合的树脂酸的光氧化似乎是最可能的衰变机制，负责颜料中的颜色变化。
This paper describes a method for the synthesis of Copper Resinate, which disappeared from artists' palettes in the eighteenth century. This was carried out by interpreting ancient recipes following a scientific approach. Its characterisation using Fourier Transform-Infrared Spectrometry and Gas Chromatography-Mass Spectrometry demonstrated that it is a mixture containing copper and oxidised abietic acids, mainly dehydroabietic and 7-oxo-dehydroabietic acids, formed during the preparation of the pigment and the curing of the paint layer. The composition of copper resinate paint layers, artificially aged by U.V. irradiation at 365 nm (UV), heating (T), and exposed to atmospheric pollutants (NOX) in a climatic chamber, was investigated. The combination of irradiation and temperature produced a change in colour along with a significant increase in the recovered amount of 7-oxo-dehydroabietic acid. The identification of copper resinate in a sample from an old painting should be related to the presence of the following resin compounds which are stable in the ageing process: dehydroabietic and 7-oxo-dehydroabietic acid pimaradienic acids. Photo-oxidation of the resin acids co-ordinated with copper seem to be the most probable decay mechanism responsible for the colour change in the pigment.