FIELD: construction.
SUBSTANCE: board base represents one of the following boards with coat film on the basis of acrylic resin on surface: cement board with addition of wood reinforcing material, extruded cement board, cellulose-cement board, gypsum board, calcium silicate board, magnesium carbonate board, cement board. Protective layer, which does not contain resins, is formed on surface of coat film. Protective layer is formed by application of processing solution, containing colloid silica, carbodihydraside, water, alcohol, surfactant. Colloid silica of protective layer consists of secondary particles formed by combination of several primary particles with size from 5 nm to 10 nm, producing fine relief on its surface, besides in protective layer carbohydraside is retained by this relief and adsorbs on it, on surface of colloid silica. Thickness of protective layer makes from 30 nm to 80 nm. Protective layer used to produce construction board is produced by dispersion of colloid silica in dispersion medium and further addition of aqueous solution of carbodihydraside. Dispersed medium is produced by addition of alcohol to water and contains surfactant.
EFFECT: highly efficient and durable function of aldehydes absorption.
5 cl, 2 tbl, 6 ex
