CZ285192A3 - Silicate solution for treating elevation plasters - Google Patents

Description

Silicate solution for finishing plasters on facades

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to the silicate treatment of potassium, pyrophosphate, non-ionic protection by treating lime-cement with a silica glass solution, to stabilize the stabilizer with fungicidal and algicidal wetting agents, possibly with hydrophobic dispersion.

BACKGROUND _fi mostly in old with> ci Elne prepared Si0a / K ₂ 0 6 to 7 uniformly permeable

The silicate of plasters with uneven absorbency, of different porous and solid substrates is known and performs repaired plasters with a dilute potassium waterglass solution with a high modulus of silicate. The plastering strengthens and becomes, and only then can a silicate paint be applied. Because special potassium water glass with a high SiDa / KaO module is not produced in the Czech Republic and its import from abroad is very expensive. It was the task of finding another suitable silica solution for silicate plasters.

On the basis of experimental tests it was surprisingly found that the water glass modulus-mol ratio, the modulus silica can also be used for the production of a silica solution with a low SiOa / KaO weight ratio

I *

1, S to 2.1, SiO 2 / KaO 2 ratio, S to 3.3 when its SiO 2 / KaO mass is increased by the addition of a colloidal oxide solution and stabilizes K 4 Pa O 7 to avoid SiO 2 gelation during storage in a strongly alkaline environment,

SUMMARY OF THE INVENTION

The essence of the silica solution for silicate lime-cement plasters on facades is a dilute mixed solution of potassium water glass and colloidal silica of up to preferably by weight, preferably 10 to 15 percent by weight of dry matter

0.57. %, preferably expensive, optionally s

0.1 to 0.1 by weight of 0.17.

SiOa / K a ratio of 2.5 5 to 20 percent with the addition of 0.02 to wt.

IX a mass active hyorophobic substance consisting of polyorganosoxane compounds, such as the water-soluble alkali salts of dimethyl, diphenyl, methyl and phenylsilane, or the water-insoluble elastomers of polydimethylsiloxane in the form of an aqueous emulsion, or

0, with the addition of a dispersion.

Preparation of silica

107. wt. %, preferably 2 to 7 wt. of an acrylate solution according to the invention

J9 very

X simple.The K4P2D7 is first dissolved in the desalinated water and then a colloidal silica solution, a potassium water glass solution, or a hydrophobic substance or an acrylate dispersion are added successively. the compound, preferably a dilute alkaline solution of the complex, is copper-treated with an alkaline N-bis-2-hydroxyethylaminoacetate salt.

If the masonry is treated with one or two coats, a small amount of hydrophobic substance and acrylate dispersion is added to the last coat to repel the water and prolong its life. If the silicate solution is used as a primer for silicate paint application, polyorganosiloxanes are not hydrophobic, however, it may contain a small amount of acrylate dispersion to improve the shelf life and processability of the coating.

The K4P2 O7 stabilizer is a silica solution that prevents gelling of SiC2 during storage and at the same time improves the hardening and strength of the coating.

The cause of the hardening of the silica coating is not fully understood and will be subjected to further study. that colloidal silica alone is not suitable for silicate plasters, since the coating hardens and is soft even after a long time.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Dissolve 150 g of a 30% by weight solution, 150 g

g v

0.05 g of copper.

by weight of a non-ionic complex with a weight of 150 ratio S1O2 / wetting agent Slovasol with stirring Ol7 g K4.P2O7 and then a colloidal silica solution of potassium water glass

TO;

2, 1> 520-Rh

= 1.35, 0.5 ml of copper solution

Syntron -D (dihydroxyethylglycine), correspondingly

Example 2

The procedure of Example 1 except that 5 g of Lukofob 3 is added. Aqueous solution of potassium salts of methyl and phenyl silanolate.

Example 3

The procedure of Example 1 is followed except that 6 g of Lukopren-E 7620 silicone emulsion is added based on a polyimide based polymer.

Example 4

The procedure of Example 1 except that 50 g of Socra 2403 LX (styrene acrylate dispersion copolymer) was added.

Industrial applicability

The silicate solution is most often used to silicate old repaired plasters with uneven absorbency and strength as a primer in the application of silicate paints. If the silica solution is used as a coating itself, it is expedient to be partially hydrophobic. The solution is to silicate the plasters with the new silica composition at a relatively low cost and without the need for special expensive potassium water glass with a high SiOa modulus. / KaO

Claims (1)

The silica solution consists of a mixture of colloidal oxide 6, preferably 4 to 5 to 15 percent, preferably 0.05 to potassium, optionally by weight, preferably for finishing plasters. for facades, characterized in that a solution of potassium water glass, an aqueous solution of silica having a SiO2 / K2O weight ratio of 2.5 to a dry weight of 5 to 20 weight percent, preferably 10 weight percent, 0.01 to 0.5 weight percent to 0.1 weight percent % of pyrophosphate by addition 0.1 to 3 percent by weight of active hydrophobic substance consisting of polyorganosiloxane compounds such as water-soluble alkali salts of dimethyl, diphenyl, methyl and phenyl silanolate, or water-insoluble elastomers up to 1 percent of polydimethylsiloxane in the form of an aqueous 10 percent by weight, % of an acrylate dispersion of the emulsion or with an addition of 0.5 to 2 to 5 percent by weight