SU478828A1 - Method of finishing concrete surfaces - Google Patents

Description

one

The invention relates to the technology of finishing concrete surfaces in the building and construction materials industry.

There is a method of finishing concrete surfaces, consisting in the sequential application of two layers of polymer-cement paint with an intermediate insulating layer.

The disadvantages of this method are insufficient water resistance and durability of the coating due to the availability of an insulating layer exposed to oxygen or ozone from air, water, and also due to the reduced adhesion between polymer-cement and insulating layers having similar charges.

The aim of the invention is to increase the water resistance and durability of the coating.

This is achieved by placing a layer of material with a charge of particles opposite to the charge of adjacent layers between the layers of polymer-cement paint.

A layer of SCS latex with borax, which has a negative charge, is applied between the layers of polymer-cement paint, such as polyvinyl acetate cement. The particles of the substance of the insulating layer fill the pores on the surface of the lower polymer-cement layer, also improving the adhesion between the layers. The pores are compacted with particles of two polymers, due to the neutralization of opposite charges. The sequence of operations is as follows:

1. Application of the first layer of polymer-cement composition or continuous putty by known methods and its essence (at a layer thickness of 0.5 mm and at 20 ° C occurs after 30-50 minutes).

2. Production of a diluted (about 30%) aqueous polymer dispersion with the required particle charge and application of a polymer-paint paint on the layer. The dispersion consumption is small and amounts to 20-50 g of dry matter per 1 m of the surface of the coating, since the insulating material is mainly needed only for filling the pores, and not for forming a protective film. The latex particles in the pores are protected from the damaging effects of ozone and oxygen.

3. The application of the second coating layer of polymer-cement paint is made no sooner than the insulating material has time to be absorbed into the pores of the first polymer-cement layer (after 5-15 minutes).

Example.

A layer of polyvinyl acetate-cement paint with the following composition is applied to the surface of the concrete, wt. h .;

White Portland Cement1.0

PBA emulsion 50% unplasticized 0, 3

Dibutyl phthalate 0.05

Water 0.5.

Paint consumption 0.6 kg / m. After the coating has dried (for 40 minutes at 20 ° C), a diluted latex of the following composition is applied to the surface of the first layer of polymer cement. including:

Divinyl Styrene Latex

SKS-65 GP1.0

Bora0.02

Water 0.3

Consumption of diluted latex 80 g / m. After 10 minutes, a covering layer of PVA cement paint of similar composition is applied. The addition of borax in latex increases the water resistance of the lower PVA-cement layer, transferring the emulsifier-polyvinyl alcohol to a water-insoluble state. The capillary suction of water by aerated concrete is reduced by 13.2 times as compared with the PVA-cement coating without an intermediate latex layer.

Subject invention

The method of finishing concrete surfaces, consisting in the sequential application

two layers of polymer paint with an intermediate insulating layer, characterized in that, in order to increase the water resistance and durability of the coating, between the layers of polymer paint paint

a layer of material with a charge of particles opposite to that of adjacent layers.