We choose environmentally friendly when choosing paints, because people choose to pay more attention to environmental protection. Floor paints are generally used in large venues, such as parking lots or large stadiums. so acrylic polyurethane finish construction methods What that? acrylic polyurethane finish construction elements which it? Xiao Bian below the decoration of the home network come to tell you about it.
1. Acrylic polyurethane topcoat construction method
1. Open barrel stirring: After opening the barrel, stir the paint to the bottom of the barrel without sediment, mix and mix according to the ratio of coating: curing agent=4:1 (weight ratio), and then grind after 15-20 minutes. If the coating is too thick, a special diluent can be added as appropriate. The dosage is 5-15%. It is strictly forbidden to dilute with water, alcohol, banana water and gasoline, and seal tightly after the coating is used to prevent moisture deterioration.
2. Surface treatment requirements: steel structure, substrate processing requirements to meet the national standard Sa2.5 or above, or manual derusting to reach St3 or above; chemical derusting can also be used, requiring no oil, no rust, no debris Dry and clean.
3. The construction temperature is 5~30°C, and the relative humidity is ≤80%. If the temperature is too low, the curing time will be prolonged. If the temperature is too high, the solvent will evaporate too quickly, causing the leveling to deteriorate. If the relative humidity is greater than 80%, it will cause whitening of the coating and bubbles.
4. Theoretical consumption: If the coating environment, coating method, coating technology, surface condition, structure, shape, surface area and other effects during actual construction are not considered, the general consumption is 0.20kg/m2.
Second, the main points of the construction of the topcoat
1, the paint should be based on the length of the paint's active period to determine the amount of paint, so how much to use in the active period, the current use, now should not be too much, and strictly in accordance with the product description To deploy. When modulating or painting polyurethane paint, it should not be in contact with water, acid, alkali or alcohol. In particular, the hardener should be sealed after opening and sealing to prevent moisture from entering.
2. Before painting, the surface of the substrate should be treated flat and clean, and all kinds of dirt should be removed. The moisture content of the substrate should be appropriate (depending on the equilibrium moisture content of the product area, generally about 2% lower). When the topcoat is made of polyester lacquer, the primer should not be coated with shellac, and nitro, polyurethane and polyvinyl butyral can be used. When using polyurethane as a primer, it must be covered with polyester paint within 5h, otherwise it will affect the adhesion of the film.
3, try to avoid coating the polyurethane paint in the rainy or summer high temperature and high humidity, winter low temperature and high humidity environment, otherwise, the coating film is easy to "white". If it is necessary to finish the application in the above environment, an appropriate amount of PU anti-whitening agent may be added to the lacquer, or the substrate to be coated may be appropriately heated to evaporate water vapor to prevent it.
In our large venues, we will always see the appearance of lacquer. What are the construction methods of acrylic urethane topcoat and what are the main points of construction of acrylic urethane topcoat? I think everyone can understand these through Xiaobian’s introduction. If you want to know more about decoration, please stay tuned to the decoration home.
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