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样品: | 油漆鉴别 | 项目: | 油漆鉴别 |
参考: | 油漆鉴别 |
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Identification of different paints is in high demand in the
art conservation and forensic communities. In general
paint is composed of several chemical compounds: pigments, binder, and additives. Pigments give color and opacity to paints. The most common pigments are inorganic
such as titanium dioxide, calcium carbonate, iron oxides,
and zinc oxide. Zinc phosphate can also be added to inhibit
corrosion. Polymers such as acrylates or epoxides are
used as a paint binder.
A commonly used technique for paint identification involves the comparison of infrared spectra of an unknown
paint against a spectral library. Inorganic pigments have
characteristics bands in the Far IR (FIR) range below 400
cm-1 (~12THz) while polymer binders have distinctive spectral features in the Mid-IR spectral range (4000-400 cm-1).
Measuring both ranges allows accurate paint identification.
As a result a spectrometer that is capable of acquiring data
both in the MIR and FIR ranges can be used as an excellent tool for this application.