Exterior wall coating construction technology:
(1) Putty: Two layers of putty, the first putty as the first face of the large face: the second putty as a leveling layer. After the two putty are scraped, the light should be checked for obvious concave and convex parts. The scraping layer of the external wall putty should be based on the principle of smoothing the surface, and the putty layer should not be too thick.
(2) Polishing. When sanding sanding, the force should be light and uniform, the direction of force should be the same, sand scratches should be prohibited, and the smooth wall should be rough. Moreover, the sandpaper is not polished properly, and the rough surface produced is not compensated by the two top coats.
(3) Alkali-resistant closed primer coating. After the engineering management personnel have passed the inspection of the putty layer, they can agree to apply the alkali-resistant closed primer. The primer coating is usually applied only once and can be topcoated after 24 hours.
(4) Topcoating. The external surface coating is usually applied by roller coating or brush coating. For the coating construction of a large area, the first step is to brush the edge, and then follow the top-down, left-to-right roll-on construction. When rolling, the viscosity of the coating should be adjusted first. The knurling should be fine and even. The direction of the roller should be the same. It should not be rolled up and down for a while, and then rolled up and down. Usually, the roller is coated and then rolled up and down. Pull evenly, then gently roll up and down to evenly apply the painted surface.
(5) Painting repair. In order to prevent the batch color matching error caused by multiple color matching, it is usually necessary to leave the original batch of paint for repairing, and try to keep the color matching consistent, and the color difference will not appear on the same wall surface. Roll as follows, then stretch the paint evenly, then gently roll up and down to evenly apply the coating.
Precautions for using exterior wall paint
Be sure to pay attention to the following points when using exterior paint:
(1) The wall after the exterior wall is painted should be timely maintained and the drying time should be paid attention to. The maintenance does not pay attention to the cracks in the wall, and the drying time is not enough. The alkalinity enhances the discoloration of the white paint on the exterior wall paint, and even partially falls off, which affects the perception.
(2) The flatness of the wall must be strictly controlled to meet the requirements of national regulations, because many engineering exterior wall construction and main construction are not a unit, and the cooperation between them is not good. If the wall is flat, the coating will be applied. It has a great impact, relying on the polishing and repairing of the paint construction team, it is difficult to make the overall smoothing of the wall.
(3) The process is strictly implemented. Grinding and scraping putty before painting must be serious, comprehensive and uniform. It should not be sloppy, it directly affects the durability and look of the paint.
(4) The primer is evenly painted, and the construction is carried out in strict accordance with the required standards. The time interval should meet the requirements. If the construction unit randomly deploys, cuts the work, and does not work according to the regulations, it will cause discoloration, etc., and different degrees of quality defects will occur within 2 to 3 years.
Application prospects of exterior wall decorative coatings
The development of the construction industry and the demand for urban beautification, architectural coatings are increasingly valued by people for their rich color, good safety, low price, low construction load, simple construction, short construction period, easy renewal, and low energy consumption. Compared with ceramic tiles, there are many advantages: the 11th Five-Year Plan proposes to save resources as a basic national policy, develop a circular economy, protect the ecological environment, accelerate the construction of a resource-saving and environment-friendly society, and promote economic development in harmony with population, resources and environment. . Adhere to economic development, clean development, and safe development to achieve sustainable development. To build a resource-conserving and environment-friendly society and achieve sustainable development, we must limit the development of industries that consume a lot of energy and have poor safety. This is undoubtedly the most powerful support for the strength of external wall paint and wall tiles. In addition, external wall bricks have obvious deficiencies in environmental protection, production, decoration, construction, and protection of buildings, and the consumption of non-renewable resources such as soil and coal in the production process is also quite large, and the price is relatively high. Higher, increased construction costs. The main task of the development of China's coatings industry will focus on architectural coatings, making the application of architectural coatings in exterior wall decoration account for more than 60%. Therefore, building exterior wall coatings have a good application prospect.
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