Abstract
The study presents the results of the composition development for producing heat-insulating fire-resistant coating for concrete and metal surfaces of various construction facilities. The composition includes binder - siloxane rubber, filler - hollow carbon microspheres, and flame retardant additive – electroplating sludge. Siloxane rubber improves heat-insulating properties of the obtained coating. Hollow carbon microspheres used as fillers in the amount of 20-50 wt.p. decrease heat insulation of the coating. Flame retardant additive in the amount of 10-15 wt.p. provides self-extinction effect to the cured coating. The study demonstrates that hollow carbon microspheres characterized by low heat insulation ratio are much more effective as compared to the glass or ceramic microspheres. Besides, they provide high strength and low specific weight due to their valuable physical and chemical properties. Metals hydroxides and oxides contained in the electroplating sludge serve as flame retardants in the polymer heat insulating coating, and effectiveness of their activity is directly proportional to their content in the composition, but the increase of galvanic sludge over 15% is undesirable, as the composition viscosity increases physical and mechanical properties of polymer coating. The study demonstrates that siloxane resin based composition filled with hollow carbon microspheres and containing flame retardant additive of galvanic sludge facilitates producing comparatively cheap but rather effective construction polymer coatings with good heat-insulating and fire resistant characteristics.
Highlights
Nowadays lots of heat-insulating polymer coating have been developed, which found wide application in protecting concrete and metal surfaces of the building structures against high temperature impact
Electroplating sludge is applied for producing various construction materials such as ceramic bricks, facade ceramic tiles, protective polymer coatings to construction structures, where it is used as filler or a pigment with the aim of utilizing the sludge [5-8]
Heat-insulating properties of the developed coating, based on siloxane resin, hollow carbon microspheres and galvanic sludge as filler have been studied at the first stage
Summary
Nowadays lots of heat-insulating polymer coating have been developed, which found wide application in protecting concrete and metal surfaces of the building structures against high temperature impact. Polyurethane, epoxy, acrylic, siloxane and other reactive oligomers and polymers are used as polymer binders in such coatings [1,2,3]. They as most of polymer materials have one significant disadvantage i.e. their increased flammability, caused by high content of carbon and hydrogen in the polymer resin. Carbon microspheres are widely used in producing spherоplastics, where hollow microspheres are bound by the polymer binders [4] They possess a number of valuable physical-chemical properties and in particular low heat-insulation coefficient, which is important for developing heat insulating coatings. Electroplating sludge is applied for producing various construction materials such as ceramic bricks, facade ceramic tiles, protective polymer coatings to construction structures, where it is used as filler or a pigment with the aim of utilizing the sludge [5-8]
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