Nowadays, there are a lot of colors on the surface of indoor and outdoor buildings, which beautifies people's visual life. What pigments are used in building materials and how to use them?
Because of its beautiful and durable color, strong sunlight exposure and climate change, alkali resistance and mortar resistance, the properties of cement are not damaged. It has strong coloring power, the most suitable particle size and structure, and good dispersion. Therefore, it is applicable to the coloring of the following building structures and cement products, various indoor and outdoor color concrete surfaces and building surfaces, such as walls, floors, floor tiles, roof tiles, panels, flumes, blocks, towers, color mortar, colored surface tiles, ridge tiles. Terrazzo and mosaic tiles are used to decorate indoor and outdoor walls, ground floors, stairs, porches, passageways, etc. Artificial stone such as artificial marble, artificial tufa stone and so on. Asbestos cement is used to decorate wall panel, floor slab, roof tile, window sill and ladder.
Usage: in concrete products, the amount of iron oxide pigment is limited to 1-10%. If the high limit is exceeded, the mechanical strength of the products will decrease, generally 5-8%. At the same time, the iron oxide pigment does not contain lead and zinc oxide, which will affect the setting time and strength. Concrete products sometimes need to be in 200. Therefore, the black and brown iron oxides which can be converted to iron red at 180 ℃ must be heat stabilized. If used on terrazzo, the bottom layer is 2-3 cm thick, and the surface layer is 15 cm thick.
Iron oxide pigments such as iron oxide red have good weather resistance, alkali resistance and light resistance. These properties are not the same as other inorganic pigments or organic pigments. Therefore, iron oxide pigments are used in building materials as coatings and coloring. Such as wall decoration, artificial marble, grinding stone floor and the coloring of silicate products. In the airport runway with colored cement or concrete pavement, iron oxide yellow is used for the exterior walls of temples, and iron oxide red is used for surface decoration around the imperial palace.