LONG-TERM STRENGTH OF COATINGS BASED ON SOL-SILICATE PAINT

Subject: durability of coating based on silicate paints. The article substantiates the prerequisites for using sol-silicate paints for finishing exterior walls of buildings. Sol-silicate paints obtained by mixing the sol of silicic acid with sodium liquid glass are considered. The features of formation of the structure of polysilicate solutions have been studied. Materials and methods: silicate and sol silicate paints. Polysilicate solutions were obtained by the interaction of stabilized solutions of colloidal silica (sols) with aqueous solutions of alkaline silicates (liquid glasses). The sol of the silicic acid Nanosil 20 and Nanosil 30 was used. For determining the long-term strength, samples measuring 10 ? 30 mm were cut from a free paint and varnish film. To evaluate the parameters of the activation energy, a series of experiments were performed to measure the longevity at various constant temperatures and stresses. Results: a higher value of the activation energy and a lower value of the structure-sensitive factor for coatings based on a polysilicate solution indicate their great strength and durability. When coatings are wetted, a decrease in the activation energy of destruction is observed, and it is more significant in coatings based on potassium liquid glass, and an increase in the structure-sensitive coefficient is also observed. Conclusions: studies have been carried out to evaluate the long-term strength of coatings based on silicate paints. It has been established that the activation energy of destruction of coatings based on polysilicate solutions is higher than the activation energy of destruction of coatings based on liquid glass. The values of the structure-sensitive factor are calculated. The results of the conducted studies and calculations indicate a higher resistance of coatings based on the potassium polysilicate solution.