The invention relates to a process for industrial production of building finishing material and can be used for the exterior and interior finishing of surfaces of residential, industrial and other buildings, as well as fireplaces, stoves, ceilings, bathrooms, arches, domes, columns, cellars, etc.

Use of natural finishing materials is labor-intensive and expensive, and therefore there appeared the need to develop and substitute the stone and wood for a material, apparently difficult-to-distinguish from natural, but easy to install, inexpensive, durable, environmentally friendly, light and, moreover, is a thermal insulator.

It is known a process for producing building finishing material or building product from siliceous sandstone, consisting in combining the binder material with the sandstone, their shaping and drying up to hardening to form the building finishing material or building product. The known process is characterized in that the binder material is combined with the sandstone directly in the place of its natural formation by impregnating the surface layer of the geological sandstone stratum, wherein prior to impregnation said surface layer is leveled, then the impregnated surface layer is dried in natural climatic conditions to the formation of the hardened layer. And the building finishing material or building product is formed by cutting said hardened layer to the desired shape and size and tearing it from the surface of the sandstone stratum [1].

The disadvantage of this process is that firstly the material has similar appearance only to sandstone cut, and to any other natural stones and wood is not similar; secondly, the material is very brittle; thirdly at the exterior facing the material requires regular hydrophobic varnishing. All this is limiting very much its application.

The closest to the claimed one is the process for producing visible coating, comprising mixing of weak stabilizing agent, water, clay, methyl cellulose, polysaccharides, polyvinyl alcohol, casein, loam, saponite, china clay, zinc oxide and/or liquid glass, or any combination thereof, with granular material. At the same time, the granular material is selected from natural stone, preferably quartz, quartz sand, sandstone, granite, slate, marble, travertine, glass, plastic, wood and/or metal, or any combination thereof [2].

The disadvantage of this process is its low elasticity, whereby when bent at 80° and more the material cracks along the curvature line, which reduces the durability of the material, or completely breaks.

The task of the present invention is to improve the quality of the finishing material by increasing its strength, elasticity, and to reduce the self-cost of production of the material and to ensure its thermal conductivity properties.

The process for producing a building finishing material comprises mixing of an inorganic binder and/or auxiliary agents with quartz sand with the production of a homogeneous material, formation of the material with its simultaneous reinforcement by a cushioning material, and thermal treatment. The thermal treatment is carried out over the entire volume of the material with the help of a microwave oscillator, at a frequency of 2450 MHz, for 20...40 s, at a temperature of 20...180°C, with simultaneous vacuum evaporation of air, as well as with subsequent curing of the produced material at a temperature of 25...38°C for 20...40 min.

Technical result

As a result of changing the structure of the layers, of which the material is consisted and at the boundaries of these layers, the elasticity of the material increases, that enables to produce a finishing material which is multiply bent to 180° without external and internal strain and cracking. Furthermore, the material is energy-saving with the coefficient λ=0,137 W/mK, the production of the claimed building finishing material is ecologically clean - at a low self-cost and the material itself is environmentally friendly.

The building finishing material, produced by the proposed process, can be easily glued onto the surface of any configuration, does not warp, does not crack and is easy to cut to the required size, which essentially reduces the building-up costs and the building-up time itself and does not differ from the natural stone or wood in outward appearance.

The proposed production process is realized as follows. Example 1

According to the process of the present invention is first prepared an inorganic binder based on a mixture containing an inorganic binding, an aqueous solution of acrylic dispersion, a siliceous component (material). In a high-speed rotor-stator mixer is charged the raw material: quartz sand, with the particle size (dispersion) from 5 to 30.0 microns, white cement grade 52.5R and maluzu - offal marble with the particle size from 20 to 50 microns. Therein is also charged the aqueous solution of acrylic dispersion in the ratio of 1:1. It is carried out the intensive mixing of said mixture at the mixing speed of at least 1500 rev/min and the oscillation frequency of mixing particles of 2000-35000 Hz during a time sufficient to achieve the desired density of 1.2 g/cm ³ for 10-30 min. The resulting mixture is subjected to shock-shear action (strain) to give a uniform homogenous product.

Then, the resulting inorganic binder is applied on the preprepared form with a layer of 1.2 m x 0.6 m in dimension and a thickness of 0.05 mm. Further, the top is covered with molded fabric of a density of 60 g/cm ³ and over it again is poured binder. The material is then thermally treated using the microwave generator for 20 to 25 seconds at a frequency of 2450 MHz and a temperature of up to 180°C and with vacuum suction of air. The material is further maintained 20 minutes at a temperature of 25-30°C.

The material is then separated from the mold and cut into tiles of specified sizes. The result is an elastic material having a coefficient of thermal conductivity of 0.137 V/mT, which can be multiply bent to any degree without cracking.

Example 2

Analogous to example 1. However, the number of layers of the inorganic binder is greater than three. The time of exposure using the microwave generator is from 30 to 40 seconds. The material is then maintained at a temperature of 32-38°C for 30-40 minutes. The result is a denser material used for building-up large areas of flat surface.

The elastic properties of the material, produced according to example 1 and example 2, are the same.

The use of material, produced by the above process, substantially increases the opportunities of architects, designers, builders in modern construction and architecture. Use of the claimed process for production of lightweight building finishing material enables not only to improve the ecological situation of dwellings due to the use of environmentally friendly, lightweight, flexible material, completely imitating the natural stone and wood, but also increases the thermal insulation of buildings and additionally protects them from moisture and other atmospheric influences.

Bibliographic data:

1. EA 200 900006 Al

2. US 201 217 142 Al Jul. 5, 2012.