Clay brick having reduced surface water absorption and method for manufacturing the same

摘要

The present invention relates to a clay brick for reducing surface water absorption and a method for manufacturing the same. The method for manufacturing the clay brick comprises: a step (a) of manufacturing clay mixed powder by mixing 15-40 parts by weight of red clay, 10-35 parts by weight of black clay, 20-45 parts by weight of white clay, and 5-30 parts by weight of granite clay; a step (b) of manufacturing a clay paste by mixing water in the clay mixed powder manufactured in the step (a), and manufacturing a molded brick by compressing the manufactured paste; a step (c) of manufacturing a coating slurry mixture by mixing a mixture, which includes 75-90 parts by weight of the clay mixed powder, 10-25 parts by weight of rice husks, 0.5-2.0 parts by weight of barium carbonate, 0.4-1.0 part by weight of sodium triphosphate, and 0.3-0.7 part by weight of carboxymethyl cellulose, with 110-150 parts by weight of the water, and wet grinding the same; a step (d) of forming a first coating layer on a surface of the molded brick by coating the coating slurry mixture on the molded brick manufactured in the step (a) and drying the same; a step (e) of manufacturing a coating alkali solution by mixing 30-50 parts by weight of potassium carbonate, 5-15 parts by weight of glycerin, 1.5-4.0 parts by weight of boric acid, and 0.5-1.2 parts by weight of a binder in 100 parts by weight of the water; a step (f) of forming a second coating layer by coating the coating alkali solution on an upper surface of the first coating layer of the molded brick; and a step (g) of sintering the molded brick on which the first coating layer and the second coating layer are formed. The present invention can prevent a condensation phenomenon of a brick building and a whitening phenomenon of contaminating the surface by reducing absorption of rainwater from the surface of the clay brick in rainy weather.