Abstract
It was suggested to use polysilicate solutions obtained by mixing liquid glass and silicic acid sol as a binder in the manufacture of sili- cate paints. Information is provided on the mechanism for increasing the operational properties of coatings based on sol silicate paint. It has been revealed that polysilicate solutions form membranes characterized by higher tensile strength due to an increase in the fraction of high-polymer fractions of silicic anions in the structure of the polysilicate binder in comparison with liquid glass. The results of a study on the interphase interaction between the pigment and the film-forming agent are given. It is shown that potassium polysilicate solutions form a smaller contact angle on the surface of the pigment (filler) and are characterized by greater work of wetting and adhesion to the filler (pigment).
Highlights
For finishing of exterior and interior walls of buildings, silicate paints, which are a suspension of pigments and fillers in liquid glass, have found wide application [1]
It is of interest to use silicate paints of polysilicates as film formers, which provide higher per- formance properties of coatings [4], [5]
Determination of cohesive strength was carried out according to GOST 18299-72 * on a tearing machine IR 5057-50 at a deformation rate of 1 mm / min We was calculated the work of adhesion of liquid glass and polysilicate solution to the pigment
Summary
For finishing of exterior and interior walls of buildings, silicate paints, which are a suspension of pigments and fillers in liquid glass, have found wide application [1]. Film-forming agents and auxiliary substances, adsorbed on the surface of pigments and fillers, form boundary interfacial layers, differing in structure and properties from the initial film former. These interphase layers affect many properties of paint and var- nish materials. The PVM have a reserve of surface energy Gibbs, determined by the surface tension of the pigment σ and the area of the interfacial surface S: The surface Gibbs energy pigment phase affects the surrounding molecules of the film for- mer both in liquid systems and in coatings. C -In accordance with equation (1), the parameter determinant the adhesion work is the ability of the polymeric film former to wet pigment particles
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