Optimization of the Paintwork Material Modified by Metal Catalyser Additive

Introduction. Current trends in the paint and varnish materials industry are embracing environmental friendliness and versatility lending wooden products good aesthetic and protective properties. The structure of wood, as a natural material, is constantly undergoing intensive and progressive processes of oxidative degradation under environmental conditions affecting the strength of wood and causes significant structural changes. Therefore the interest in improving the durability of paint coatings under the influence of environmental factors on their performance justifies the intensification of research in the development of new effective solutions. One of the effective ways to prevent the destruction of the wood structure is to apply a protective layer of paint and varnish material by chemically modifying the surface and, above all, by introducing siccatives. The introduction of siccatives makes it possible to ensure a uniform drying rate throughout the entire volume and additionally disperse the pigment, which improves the physical and mechanical properties of the paintwork and increases its durability.

The purpose of the research work is to establish the effect of the addition of a metallic catalyst in the form of highly dispersed precipitation waste from an electric arc furnace on the physical and mechanical properties of paint and varnish materials.

Materials and Methods. The initial components for obtaining oil paint compositions (paintwork material) were used in the experiments as: binder-natural olifa, pigment-ochre, fine aggregate-chalk. To the intensification of the drying process, the addition of metal catalyser, which is a highly dispersed waste of deposition from electric arc furnace, was introduced. The granulometric composition of chalk was evaluated using scanning electron microscopy, and dust using a microsizer 201c laser analyzer.

Results. According to the results of the optimisation, regression equations represented as a polynomial of the second degree and the optimal material composition of the paint material were obtained. In order to solve the problem of drying, a metal catalyser was added to the optimal composition in the amount of 0.05 % of the binder weight. A comparison of the obtained results of regulatory tests of the physical and mechanical properties of the two formulations, the control (without additives) and the modified with the addition of a metal catalyst in the form of dust, indicate the prospects of its use as a siccative.

Discussion and Conclusion. The introduction of a siccative into the oil-based paint and varnish material in the form of a by-product of highly dispersed precipitation waste from an electric furnace accelerated the polymerization process and improved the physical and mechanical properties of the modified composition in comparison with the control one. Improving the physical and mechanical characteristics of oil paint will increase the resistance of coatings to environmental factors and thus increase its durability.

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