Demidov D. Acrylic water-dispersion coatings for construction purposes with improved thermal insulation and performance properties

The purpose of the dissertation is to create heat-insulating thin-layer acrylic water-dispersion coatings for construction purposes with improved technological and operational properties, resistant to climatic aging. The object of research is the processes of structure formation and formation of adhesive-strength and operational properties of acrylic water-dispersion coatings. The subject of research is acrylic aqueous dispersions filled with hollow aluminosilicate microspheres and hydrophobized aerosil. In the context of the outlined dissertation work is focused primarily on the creation of heat-insulating thin-layer highly filled acrylic water-dispersion coatings with improved technological and operational properties of construction. Research methods. In order to study the properties of acrylic dispersion and developed highly filled thin-layer coatings based on it, the method of determining thermal conductivity and thermal resistance under stationary thermal regime in accordance with the regulations of DSTU B B.2.7-105-2000. The amount of heat loss is calculated by heat transfer of flat and cylindrical walls in steady state. The study of structural and mechanical characteristics was carried out by the rotational method. In order to determine the free surface energy of solid surfaces, the Owens-Wendt-Cable method at the wetting angle of the test liquids was used. Adhesion strength to concrete is determined by the separation method according to ISO 4624:2002. The vapor permeability and water permeability class is set in accordance with DSTU EN 1062-1:2012. Physico-mechanical characteristics were studied according to standard methods. The morphology of the coatings was studied using a scanning electron microscope in the modes of secondary and backscattered electrons. Statistical processing of experimental data was performed by the method of least squares. In addition, methods of correlation analysis and calculation of confidence intervals were used. Novelty of the newly introduced. The possibility of obtaining highly filled acrylic coatings with uniform distribution of hydrophilic hollow aluminosilicate microspheres and hydrophobized aerosil has been demonstrated, which improves thermal insulation properties and the formation of coatings with high vapor permeability (close to class V3) and reduces. The notion of regularities of change of rheological properties, wetting ability, physical-mechanical and heat-insulating properties of acrylic dispersions depending on the ratio of aluminosilicate microspheres and hydrophobized aerosil is expanded; Possibilities of application of the developed acrylic water dispersions as heat-insulating coverings (coefficient of thermal conductivity - 0,0416 W/(m2∙K)) on a surface of a flat and cylindrical wall are investigated. It is established that the developed thin-layer thermal insulation coatings based on acrylic dispersion due to climatic aging retain stable physical and mechanical properties, namely: adhesive strength decreases by 7%, vapor permeability increases by 15-20%, water absorption increases by 15-18% while maintaining thermal insulation properties. at the level of 90–95%, which allows forecasting the service life in a continental temperate climate zone of at least 10 years. Degree of implementation and scope. Thin-layer heat-insulating acrylic coatings for construction purposes with improved technological and operational properties have been developed, the compositions of which are protected by 1 Patent of Ukraine for invention and 3 Patents of Ukraine for utility model; coatings are used in the practice of construction of enterprises as thermal insulation of elements of structures of overpasses, thermal protection of pipelines of the system of autonomous gas heating and water supply, decorative protection of finishing of plastered facades of buildings at the enterprise. The technological instruction on preparation and application of water-dispersion heat-insulating coverings, and also the project of technical conditions on water-dispersion heat-insulating coverings intended for industrial and household application in thermal insulation and decorative protection of external and internal enclosing designs, pipelines at any configuration is developed. operation from -30 ° C to + 100 ° C, at relative humidity in the room - no more than 75%.