Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): IV. Identification of Some Organic Pigments Used in Red and Brown Nonmetallic and Metallic Monocoats—Quinacridones

EM Suzuki

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Cultural Heritage Materials Analysis Spectroscopy and Chemometric Analyses Pigment Synthesis and Properties

Abstract

Abstract A previous study in this series demonstrated the feasibility of identifying organic pigments in situ based on their absorptions in infrared spectra of automobile topcoats. To isolate pigment peaks, spectra of closely matched topcoats lacking pigment features are subtracted from spectra of topcoats containing the pigment of interest. Once identified by this means, these pigments can often be determined based on the more limited number of pigment peaks observed between the broader binder absorptions, or superimposed on them. Spectra of closely related pigments are used to provide some indications of how distinct a particular set of pigment absorptions is. Using these techniques, several different quinacridone pigments have been identified in single-layer U.S. automobile original topcoats (1974–1989) from the Reference Collection of Automotive Paints. Two of these pigments, Quinacridone Red Y and Quinacridone Violet, were found to be common in red nonmetallic topcoats. Quinacridones were also identified in brown nonmetallic and red and brown metallic finishes. A number of different pigment combinations of quinacridones with both inorganic and organic pigments have been identified, and examples of these are presented. As a prerequisite to the analysis of pigments using this in situ method, analysts should be very familiar with the absorptions of automotive topcoat binders.

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References

1996Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): I. Differentiation and Identification Based on Acrylonitrile and Ferrocyanide C≡N Stretching Absorptions 1997Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): III. In Situ Identification of Some Organic Pigments Used in Yellow, Orange, Red, and Brown Nonmetallic and Brown Metallic Finishes—Benzimidazolones 1996Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): II. Identification of Some Topcoat Inorganic Pigments Using an Extended Range (4000-220 cm−1) Fourier Transform Spectrometer

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2013Infrared Spectra of U.S. Automobile Original Finishes (Post – 1989). VIII : In Situ Identification of Bismuth Vanadate Using Extended Range FT ‐ IR Spectroscopy, Raman Spectroscopy, and X‐Ray Fluorescence Spectrometry 2006Infrared Spectra of U.S. Automobile Original Finishes. VII. Extended Range FT‐IR and XRF Analyses of Inorganic Pigments In Situ—Nickel Titanate and Chrome Titanate 1999Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): V. Identification of Organic Pigments Used in Red Nonmetallic and Brown Nonmetallic and Metallic Monocoats—DPP Red BO and Thioindigo Bordeaux 1999Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): VI. Identification and Analysis of Yellow Organic Automotive Paint Pigments—Isoindolinone Yellow 3R, Isoindoline Yellow, Anthrapyrimidine Yellow, and Miscellaneous Yellows 2021Infrared spectra of North American automobile original finishes. XI: In situ identification of perylene pigments—Analysis of Perylene Maroon (C.I. Pigment Red 179) and alumina-based red pearlescent pigments

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