RU2236391C2 - Method of manufacturing finishing material for building parts - Google Patents

Abstract

FIELD: manufacture of building materials.

SUBSTANCE: invention relates to manufacture of mineral decorative grains intended for surface of concrete products and roofing materials. Method of invention comprising grinding rock, grain size fractionation, applying onto grain surface coloring composition consisting of binder and inorganic pigment, heat treatment, and cooling, contemplates drying fractioned grains to residual moisture 0.5-2%, using alumino-chromo-phosphate binder with density 1500-1700 kg/m and, additionally, surfactant (OP-7 or OP-10, 0.02-0.1%). Composition is applied in amount 3-5% of the weight of grains. Colored grains are thermally treated at 200-250^оС, cooled to 150-170^оС, and treated with alkyltriethoxysilane or methoxysilane (waterproofing agents) in amounts 0.05-0.1% of the weight of colored grains. Inorganic pigment (5-15%) of coloring composition is selected from iron oxide, chromium oxide, titanium dioxide, and zinc white. Fraction distribution of ground rock is the following, mm/wt %: 2.0-1.6/2-6. 1.6-1.25/5-10. 1.25-0.63/60-83. 0.63-0.25/10-20, and below 0.25 mm - the rest.

EFFECT: increased coloration intensity and water resistance and improved adhesion capability.

3 cl, 1 tbl

Description

The invention relates to the construction materials industry, namely the production of decorative mineral grains intended for surface finishing of concrete products and roofing materials.

There is a method of obtaining a colored facing powder from crushed rock, which, after sieving on sieves, is mixed with liquid glass and mineral dye, followed by drying and firing of colored grains in an oven at a temperature of 1060-1250 ° C (see AS No. 1331850, 1984 g.). Also known is a method of coloring granular material by applying to the surface of grains of crushed rock a coloring composition based on white cement and inorganic pigment with its subsequent curing (see as.with. No. 3117634, class. 04 V 14/02, 1970) .

The closest of the analogues is a method of manufacturing a decorative filler by crushing the rock, fractioning it by grain size, applying a coloring composition to the grain surface, including a binder - liquid glass and inorganic pigment, subsequent heat treatment and cooling (see RF patent No. 21440009 C1 of July 27, 2007 .1999). The objective of the present invention is to obtain a finishing material with high intensity staining, water resistance and improved adhesive properties. The problem is solved due to the fact that the method of obtaining a finishing material for building products, including crushing the rock, its fractionation by grain size, applying a coloring composition consisting of a binder and inorganic pigment to the surface of the grains, heat treatment and cooling, provides that the grains after fractionations are dried to a residual moisture content of 0.5-2%; as a binder, the coloring composition contains an alumochromophosphate binder with a density of 1500-1700 kg / m ³ and additionally surface the active substance, the composition is applied in an amount of 3-6% by weight of the grains, the colored grains are heat treated at a temperature of 200-250 ° C, cooled to a temperature of 150-170 ° C and treated with a hydrophobic agent actyltritoxysilane or methyloxysilane in an amount of 0.05-0.1% by weight of the colored grains, the coloring composition includes an aluminum chromophosphate binder, an inorganic pigment one of the group: iron oxide, chromium oxide, titanium dioxide, cobalt oxide, zinc white, and as a surfactant - OP-7 or OP-10 in the following ratio comp onents, wt.%:

Inorganic pigment 5-15

Specified surfactant 0.02-0.1

Alumochromophosphate Binder Else

in addition, the grains of crushed rock have the following fractional composition, wt.%:

2.0-1.6 mm 2-6

1.6-1.25 mm 5-10

1.25-0.63 mm 60-83

0.63-0.25 mm 10-20

Less than 0.25 mm rest

An example embodiment of the invention.

In the manufacture of finishing material for building products, screening is used from crushing natural rocks, for example, serpentenite, basalt, shale and others, which are scattered in raw form into fractions to separate large grains and dust. The necessary fractions for production are mixed in the desired ratio and dried in a drying drum to a residual moisture content of 0.5-2%. The presence of a small amount of residual moisture provides a more uniform distribution of the coloring composition on the surface of the material to be painted. The coloring composition is prepared on the basis of an aluminum-chromophosphate binder, which is mixed in the reactor-mixer with the required amount of inorganic pigment and a surfactant. Mixing time is 10-15 minutes. The dried grains of crushed rock and the coloring composition through the dispensers continuously enters the twin-screw mixer, in which the surface of the grains is stained. The more colored grains go to heat treatment in a direct-flow drying drum. The temperature of the material at the outlet of the drum is 200-250 ° C. In the process of heat treatment, the coloring composition is fixed on the grain surface with the formation of a durable colored film with a thickness of up to 0.1 mm. Hot colored grains are cooled to 150-170 ° C and treated with a solution of a water-repellent agent based on organosilicon compounds to increase their water resistance, hydrophobic and adhesive properties. After final cooling, the obtained grains of the finishing material are fed to a vibrating screen to separate conglomerates and then packaged in containers. Obtained by the specified method, the finishing material can be used both for finishing the outer surface of concrete products, and for roofing materials.

The following materials were used to make the finishing material: screening from crushing of basalt, serpentenite or shale with grain sizes less than 2 mm, inorganic pigments from Bayer or domestic production (chromium oxide GOST 2912-79, iron oxide red pigment TU 6-10- 602-86, titanium dioxide TU 175-024-00545484-98). The aluminum-chromophosphate binder TU 113-68-606-87 was used as a binder, and the non-ionic surfactant, a product of processing a mixture of mono- and dialkylphenols (GOST 8433-81), was used as a surfactant OP-7 or OP-10. For hydrophobization of the surface of the colored grains, actyltritoxysilane in the form of a 50% emulsion with the trade name Penta-832 (TUm2251-035-40245040-2002) and methyloxysilane in the form of a 50% emulsion of Penta-814 (TU 2251-020) were used -40245042-01). The values of the main technological parameters and the properties of the output product are given in the table. The proposed method allows to obtain a finishing material in the form of small colored grains. The quality of decoration of building products is improved, since a thin decorative painted film on the grain surface has increased weather resistance and adhesion strength (up to 0.5 kg / mm ² ). The film is practically insoluble in water even with a 30-minute boil.

Claims (3)

1. A method of obtaining a finishing material for building products, including crushing the rock, its fractionation by grain size, applying a coloring composition consisting of a binder and inorganic pigment to the surface of the grains, heat treatment and cooling, characterized in that the grains are dried to residual moisture after fractionation 0.5-2%, as a binder, the coloring composition contains an aluminum chromophosphate binder with a density of 1500-1700 kg / m ³ and an additional surfactant, the composition is applied in a quantity 3-6% of the mass of grains, colored grains are heat treated at a temperature of 200-250 ° C, cooled to a temperature of 150-170 ° C and treated with a hydrophobic agent actyltritoxysilamine or methyloxysilane in an amount of 0.05-0.1% of the mass of colored grains. 2. The method according to claim 1, characterized in that the coloring composition includes an alumochromophosphate bond, an inorganic pigment - one of the group: iron oxide, chromium oxide, titanium dioxide, cobalt oxide, zinc white, and as a surfactant OP-7 or OP-10 in the following ratio of components, wt.%: Inorganic pigment 5-15 Specified surfactant 0.02-0.1 Alumochromophosphate Binder Else 3. The method according to claim 1, characterized in that the grains of crushed rock have the following fractional composition, wt.%: 2.0-1.6 mm 2-6 1.6-1.25 mm 5-10 1.25-0.63 mm 60-83 0.63-0.25 mm 10-20 Less than 0.25 mm rest

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