METHOD OF PREPARING PROTECTIVE AND DECORATIVE COATING Russian patent published in 2001 - IPC

FIELD: building materials industry, more particularly preparation of protective and decorative coatings on asbestos-cement, concrete and ceramic products. SUBSTANCE: surface of products is pretreated with solution of coagulant salts, coloring thermosilicate composition is then applied and heat treated in stepwise manner, at first it is dried at temperatures from 70 to 100 C for 10-30 min and is then heated to 230-300 C at rate of 2-12 C/min and kept for 10-30 min, and then cooled to room temperature. Coagulant salts include water- soluble salts of II-VI group metals. EFFECT: more efficient preparation method. 2 cl, 1 tbl