Water glass and silicate paints
Please specify the composition of pure silicate paints
Silicate paints contain potassium water glass as a binder. This binder is one of the two components of the paint, called a fixative. The second ingredient is dry powder paint, containing pigments resistant to water glass and fillers favoring silification.
The fixative and the powder paint are mixed only the day before painting in proportion 1:1, without adding water.
Please explain, how does the silification of silicate paints work
The potassium water glass binder binds carbon dioxide during hardening, a layer of silica is formed on the substrate. Under favorable conditions, when e.g.. the medium still contains calcium hydroxide, hardening of the potassium water glass, also chemically bonds with the substrate. This hardening is called silification. As a result, a very thin mineral layer forms on the substrate.
What is the difference between pure silicate paints and dispersion silicate paints?
Dispersion silicate paints include, unlike pure silicate paints, do 5% by weight of organic ingredients; they are almost exclusively plastic dispersions. Due to the content of plastic dispersion, dispersion silicate paints can be made in liquid form, ready for painting. Therefore, these paints are easier to use.
For what substrates are silicate paints suitable?
Silicate paints are suitable for mineral substrates, such as: lime and cement plasters, concrete, cement-fiber boards, bricks, old silicate paint coatings etc.. However, they are not suitable for covering gypsum substrates (although these belong to the mineral substrates).
Silicate paints also stick well to aluminum and zinc substrates. Painting wood with them (ogniochronous) it does not raise problems only in the interior.
What are the properties of silicate paint coatings?
Silicate paint coatings are particularly resistant to weather conditions and are very permeable to water vapor. On mineral substrates, silification is possible, i.e. the chemical bonding of the coating to the substrate. Due to the fact that very lightfast dyes are used for silicate paints, it is the coatings made of them that change the shade to a very small extent.