Abstract
The cadmium pigments were yellow, orange and red pigments. They consisted of cadmium sulphide and cadmium sulphide with zinc sulphide as well as cadmium sulphide with cadmium selenide. Their quantitative composition and specific surface area were examined. The pigments were used to color the poly (vinyl chloride) plastisol films, which were then exposed to UV radiation. The surfaces of the coloured membranes were examined by infrared spectroscopy before and after irradiation with UV. The changes occurred in the PVC membrane were investigated by thermogravimetric analysis. The degree of crystallinity of the pigments and the membrane was determined by X-ray diffraction. The color change of the membranes was determined from the spectra obtained by reflection spectroscopy, and the components of colour L*, a* and b* were calculated. Base of them, the tolerance of colour deviations (ΔE*) was determined. The calculations allowed for the determination of the effect of UV irradiation on the change of the colour of the membranes and confirmation of the degradation of the pigments and polymer membrane.
Highlights
Pigments in paint coatings fulfill decorative and protective functions
Yellow, orange and red cadmium pigments consisting of cadmium sulphide or their crystalline mixtures with cadmium selenide were selected for research
Infrared spectroscopy revealed that the coloured polyvinyl chloride membranes underwent degradation after UV irradiation
Summary
Pigments in paint coatings fulfill decorative and protective functions. Coloring of plastics is one of the factors determining the so-called life cycle of the product made of the m aterial[1]. Auger and McLoughlin[6] investigated colour fading of acrylic coatings with titanium white of rutile structure and yellow pigments when exposed to UV radiation They studied compositions of white pigments with cadmium yellow and red pigments being mixtures of cadmium sulphide and cerium sulphide. Yellow, orange and red cadmium pigments consisting of cadmium sulphide or their crystalline mixtures with cadmium selenide were selected for research It is a group of pigments used to color poly (vinyl chloride) plastisols, polymer products and paints whose coatings are resistant to high temperature, chemical agents and solar radiation. The scientific goal was to determine the mechanism of polymer and pigment degradation as well as the type of changes and products in the colored films resulting from irradiation.
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