CS211648B1 - Substance for the surface treatment of building elements - Google Patents

Description

The present invention relates to a building surface treatment composition capable of withstanding, in the cured state, elevated temperatures of up to 105 ° C and relative air humidity of up to 100%.

The existing thin-film surface treatment methods do not make it possible to produce panel elements in a production plant without building a special assembly workstation directly in the production line. Therefore, surface treatment with synthetic dispersion-based materials in prefabricated panels prolongs the production cycle and disrupts the line cycle. When surface treatment of the interior side of the panel with conventional types of interior synthetic materials (eg, polyvinyl acetate dispersion-based gravel plasters) is performed, such treated panels cannot be stored in a loose open landfill because this type of surface treatment is unable to withstand external weather conditions.

The above drawbacks are overcome by the use of the mass-based precast finishes of the present invention.

The object of the invention is a composition for surface treatment of building elements which, in the cured state, is able to withstand elevated temperatures up to 105 ° C and relative air humidity up to 100%. This material contains, in addition to additives which modify the rheological, fungistatic or other properties of the material, 2 to 15% by weight of dry matter of macromolecules! % of the material supplied in the form of an aqueous dispersion, 0.2 to 3 wt. % of soluble cellulose derivative, 2 to 15 wt. % of silica derived from a colloidal solution in water, 40 to 65 wt. inert mineral fillers of grain size up to 6 mm and 10 to 50 wt. water.

Like water-dispersed macromolecules! the material used is a styrene + acrylate copolymer or a vinyl acrylate + acrylate copolymer or an acrylate type copolymer or homopolymer.

This mass can be prepared by mixing the individual components, ie macromolecules! synthetic dispersions in water, an aqueous solution of a cellulose derivative e.g. with an etheric bond, colloidal

21,648. ..-. 2, a solution of silica in water, inert mineral fillers of a grain size of up to 6 mm, water and various modification additives (e.g., thixotropic or fungicidal) in an apparatus commonly used for the production of building materials.

The composition of this composition has the property that, in its cured state, it is able to withstand the whole grain-free process of heat treatment of concrete mixes in prefabricated, for example by steaming, i.e. at temperatures up to 105 ° C and relative humidity up to 00%.

The surface treatment with this type of mass cannot therefore be carried out at the assembly station during the production line of the panel elements, but rather as a precast piece. a separate workstation, eg outside the panel plant by applying (eg spraying, stretching, pouring or otherwise) the mass of the invention to a suitable support element.

The prefabricated product thus obtained exhibits its distinctive properties after proper curing, after which it can be placed in the mold for the manufacture of the panel by surface treatment of the mold substrate, and then the actual construction of the element is carried out thereon.

The embodiment of the invention is illustrated by the following examples.

Example 1

The mass of this composition was produced:

synthetic dispersion containing 52 wt. styrene + acrylate copolymer Carboxymethylcellulose solution at a concentration of 6.5% (w / w) Colloidal silica solution with a dry matter content of 30% (w / w) sodium lauryl sulphate

Limestone with granulometry up to, mm

Silicone type defoamer

150 wt. parts by weight parts

2.0 wt. parts 1 wt. part

000 wt. parts

0.3 wt. part

This mass was poured onto a nonwoven glass mat of about 10 mm thickness so that the glass fiber itself did not penetrate the surface of the surface anywhere. After curing for 20 days at a temperature of 20 ° C and 60% relative humidity, the prefabricated product was placed in a mold for the manufacture of a panel and the actual construction of the sandwich reinforced concrete element was carried out. After steaming, an internally finished finished surface element was removed from the mold and was capable of storing in an open dump after cooling for approximately 15 minutes.

Ex. 1 and d. 2

A mass of the following composition was produced:

synthetic dispersion containing about 55% vinyl acetate + acrylate copolymer 30 wt. parts

A solution of hydroxyethylcellulose in water at a concentration of 2% by weight, 0% by weight. parts

Silicone type antifoam 0.1 wt. part

Ground limestone with maximum grain size up to 1 mm 400 wt. parts, 0% solution of sodium hexametaphosphate in water, 5 wt. parts

30% colloidal silica solution 120 wt. parts

In the thickness of 2 to 3 mm in the horizontal position, the mass was stretched by a steel trowel on a 4 cm thick polystyrene plate. After curing for 7 days, the plate was used similar to Example 1 and a similar result.

AND

Example 3

A mass of the following composition was produced:

synthetic free dispersion containing about 52 wt. styrene + acrylate copolymer. 80 wt. d.

6.5% solution of carboxymethylcellulose in water 60 wt. d.

silicone type antifoam 0.5 wt. d ground limestone with a maximum grain size of up to 1.5 mm 320 wt. d.

marble crumb with grain size 1.5 to * 4.0 mm 250 wt. d

10% solution of sodium hexametaphosphate in water 20 wt. d

30% colloidal silica solution 200 wt. d.

The mixture thus produced was sprayed at a thickness of 2 to 5 mm onto a polystyrene sheet of 2.5 cm cm thickness. After curing for 3 days, the product was used as in Example 1 except that it was placed on the outside of the gable panel. After being removed from the mold after steaming, a gable panel with a finished surface was produced, capable of being stored in an open landfill after cooling.

The composition according to the invention can be used in the production of panels for residential, civil and industrial construction, where it speeds up the production process, improves the aesthetic and thermal-technical parameters of the manufactured parts.

Claims (2)

1. A composition for the surface treatment of building elements, capable of withstanding, at cured conditions, elevated temperatures up to 105 ° C and relative air humidity of up to 100%, for example in the heat treatment of concrete and containing additives such as thixotropic or fungicidal other material properties, characterized in that it contains 2 to 15 wt. % solids of macromolecular material supplied in the form of an aqueous dispersion, 0.2 to 3 wt. % water-soluble cellulose derivatives, 2 to 15 wt. % of silica derived from a colloidal solution in water, 40 to 65 wt. inert mineral fillers of grain size up to 6 mm and 10 to 50 wt. water, 2. A surface treatment composition according to claim 1, characterized in that the water-dispersed macromolecular substance ae is a styrene + acrylate copolymer or a vinyl acetate + acrylate copolymer or a copolymer or homopolymer of the acrylate type.