COMPOUND FOR MAKING PROTECTIVE COAT Russian patent published in 2005 - IPC

FIELD: refractory materials; compounds forming protective coats for avoidance of oxidation of oxygen-free and carbon-containing materials at heating of lining and in the course of its service.

SUBSTANCE: proposed compound contains the following constituents, mass-%: quartz-containing component, 15.0-65.0; boron-containing component, 1.0-30.0; lead monoxide and/or ferric oxide, 0.01-40.0; alkaline, 0.05-2.0; the remainder being water glass. If necessary, the compound may additionally contain the following components, mass-%: polyorganosiloxane, 0.05-2.0; deflocculant, 0.1-2.0; adhesion modifying agent, 0.01-5.0; thixotropic additive, 0.01-3.0. It is preferable that water glass has density of 1.18-1.45 g/cm³ and silicate modulus of 2.1-4.0; quartz-containing component contains at least 55 mass-% of silicon oxide at dispersity not exceeding 200 mcm; boron-containing component contains no less than 40 mass-% of boron oxide, lead monoxide and/or ferric oxide at dispersity not exceeding 200 mcm and specific density no less than 3.0 g/cm³; composition is characterized by density of 1.75-2.2 g/cm³, viscosity of 6-13 s, time of complete drying on surface being protected of 20-30 min, spreading temperature not exceeding 600°C and thickness of coat after spreading of 0.1-0.3 mm.

EFFECT: reduction of porosity, gas permeability and coat spreading temperature; increased service life of compound.

6 cl, 2 tbl