Analysis of Coating Materials

Modern coating materials are complex mixtures of binders, solvents, pigments, extenders, and additives. Most of these components consist of several constituents. Complete analysis of coating materials therefore requires comprehensive knowledge and the use of various analytical methods. 

The analysis of coating materials is often employed in the investigation of complaints and substandard batches, or to evaluate competing products. Analysis also plays an important role in the assessment of raw materials, occupational safety and hygiene, and the emission of solvents and decomposition products during paint curing. 

In the case of complaints, the binder and pigment (extender) composition of the individual layers have to be established to determine the origin of the paint material in doubtful cases. Establishing the cause of coating defects (e.g., inclusions, delamination, peeling) is also important. These and other analytical investigations are time-consuming and expensive. Optimal utilization of analytical resources therefore requires a clear definition of the problem in hand. 

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This process was developed further with packed-bed techniques. A limitation is that the particle size had to be reduced and this was carried out by the ultrasonic irradiation of the mixture before electrolysis. The average particle size was 25 p.m. A detailed analysis of the material balance was made [37], Ebonex reduced TiC>2 coated with SnC>2 doped with Sb2C>3 was found to be the best anode materials. A 1996 model cell is shown in Figure 1.20 [38]. 

Reviews on the analysis of polymers and polymer products have recently appeared (184-187). Typical applications are covered for analysis of raw materials for coatings (188-191) and determination of volatile components of commercial polymers (192). Mass spectrometry of thermally treated polymers (193) and of stressed polymers are treated (194) with instrumental and experimental details given in more detail than in corresponding journal references. 

In the analysis of coatings of dry paint film, the components can be characterized using microscopic techniques that can be applied to the study of the homogeneity of samples and require only small amounts of material. 

Figure 4.23. Electrochromic detection of anodically generated protons at the WOs-coated counter electrode [130], (Brace KM, Hayden BE, Russell AE, Owen JR A parallel optical screen for the rapid combinatorial electrochromic analysis of electrochemical materials. Advanced Materials. 2006. 18. 3253-7. Copyright Wiley-VCH Verlag GmbH Co. KGaA. Reproduced with permission.)...

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