Abstract
The object of this research is the process of natural sedimentary calcite modification. The main problems that are solved in this research are the choice of the most suitable low molecular weight modifier among potassium methylsiliconate, sodium methylsiliconate and polymethylhydride siloxane, as well as the selection of optimal grinding regimes for the raw mineral. It is found that during the mechanochemical activation in the presence of organosilicon modifiers, hydrophilicity coefficient of the surface of the sedimentary chalk is significantly reduced. The most effective modifier for the surface of sedimentary calcite is polymethylhydride siloxane. It is established that in the presence of modifiers, grinding and amorphization of carbonate raw materials are activated, which is confirmed by a decrease in the intensity of calcite reflections to 9 % in the case of the use of polymethylhydride siloxane and by 5–7 % in the case of methyl siliconates. It is shown that the modification of the sedimentary chalk surface leads to a decrease in the capacity of its adsorption layer by 20 % of the capacity of the processed material. The strength of the coagulation structure in the filler-film former system also decreases: the yield point of the system with untreated material is 20 % higher than this limit for the system where chalk is modified with polymethylhydride siloxane. Despite the advantages of the proposed technical improvement, it is likely that the use of traditional fatty acid-based materials will remain more attractive in continuous production. Since this method has advantages from the point of view of the absence of the need to change the existing composites formulations, and from the point of view of minimizing the cost price. Research results will be more interesting in those industries where improving the properties of the material plays a decisive role.
Highlights
The use of fillers in protective and decorative paint and varnish materials allows to significantly reduce their cost price, as well as to achieve improved performance characte ristics such as crack resistance, strength, barrier properties, corrosion resistance, and so on
Micronized calcite is the most common filler. The use of this filler is explained, on the one hand, by relative inactivity and by the absence of a significant deterioration in the properties of composites, and on the other hand by the stability of the quality of this material. The cost of this type of raw material, increases if it is imported, as it happens with different brands of micronized calcite in Ukraine
A number of deposits of sedimentary calcite are located on the territory of Ukraine, which can poten tially be used in the production of coatings
Summary
The use of fillers in protective and decorative paint and varnish materials allows to significantly reduce their cost price, as well as to achieve improved performance characte ristics such as crack resistance, strength, barrier properties, corrosion resistance, and so on. The use of this filler is explained, on the one hand, by relative inactivity and by the absence of a significant deterioration in the properties of composites, and on the other hand by the stability of the quality of this material The cost of this type of raw material, increases if it is imported, as it happens with different brands of micronized calcite in Ukraine. An essential shortage of sedimentary materials remains the high adsorption capacity due to their increased amorphousness with respect to the binder, as well as in creased hygroscopicity Elimination of these shortcomings will increase the attractiveness of Ukrainian carbonate raw materials for use in a number of paint and varnish materials. When developing the technology for the modi fication of carbonate fillers, it is necessary to take into account the peculiarities of their mineralogical composition and crystalline structure, which is the determining factor of technical properties
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