Common defects and treatment methods in the process of showcase painting

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Showcase painting defects and treatment methods

Blight name cause solution
Bubble 1. The surface of the object to be coated has oil and moisture. 1. The surface of the object to be coated remains dry and clean.
2. The coating itself is poor in water resistance. 2. Use water and moisture resistant coatings.
3. The wood has a high water content and will be applied without drying. 3. The wood moisture content is required to be equivalent to the local equilibrium moisture content.
4. The diluent is unreasonable and the volatilization is too fast. 4. Add slow dry water and adjust the evaporation rate.
5. After drying, put it in high temperature and high humidity for too long. 5. Avoid drying the coating in a high temperature, high humidity position.
6. The coating is too thick and the solvent is difficult to volatilize. 6. It should not be too thick, and the primary coating should not exceed 30μm.
Sagging 1. The sag coating has a low viscosity and the coating is too thick. 1. Adjust the viscosity of the coating, the thickness of the coating should not exceed 30μm at a time.
2. The spray distance is too close and the gun moves too slowly. 2. The spraying distance is 150-300mm, and the speed of the spray gun is controlled appropriately.
3. The gun is too large. 3. According to the actual situation, choose the appropriate caliber spray gun, generally 1.5-2mm.
4. The spray air pressure is uneven. 4. Maintain a stable air city Guoli during construction.
5. The paint contains high density nutrients and is unevenly stirred. 5. The paint should be fully stirred evenly during the construction.
6. The surface of the object to be coated is too smooth. 6. The surface roughness of the object to be coated should be ensured and the layers should be carefully ground.
Bite the bottom 1. The bottom layer and the surface layer are not matched, such as nitro primer and polyester surface layer. 1. The same type of paint.
2. Apply the top coat when the bottom layer is not dry. 2. Apply the top coat after the bottom layer is dry. .
3. The primer layer is too thick. The bottom layer and the top layer coating should be used together. 3. Should be too thick, the primary coating should not exceed 30μm
Whitening 1. The construction humidity is high, the temperature is high, and the solvent evaporates quickly. 1. Adjust the temperature or humidity in the construction environment and add moisture-proof or slow-drying water.
2. The paint or thinner contains moisture. 2. Pay attention to the use of genuine brand paint.
3. In the construction, the oil-water separator malfunctions and the moisture is brought into the paint. 3. Repair the oil-water separator to prevent moisture from entering the coating.
4. The solubility of the thinner is not enough, so that the resin of the coating is whitened. 4. Use matching thinner.
5. Hand sweat stains the workpiece. 5. Wear cloth gloves and polish the hand sweat stains.
Pinhole 1. The viscosity of the coating is too high, the mixing time is too long, and the air entering part cannot be released. 1. The viscosity of the coating is properly formulated and used after being in a period of time.
2. There is no way to surface the surface of the workpiece to be coated. 2. Work surface is cleaned before construction.
3. The spray air pressure is large, the caliber is small, and the spray distance is too far. 3. Adjust the air pressure, generally 0.6mpa, and master the spray distance.
4. The coating is too thick and the solvent is difficult to volatilize. 4. The primary coating should not be too thick and should not exceed 30μm.
5. The construction site has high temperature and high humidity. 5. Add anti-moisture agent and slow dry water.
Shrinkage hole 1. There are water or oil droplets on the coating surface in the paint and thinner. 1. Dispose of the oil-water separator to prevent moisture from entering it, or to prevent oil and wax from falling on the surface of the coating.
2. The surface of the object to be coated is oil, wax, soap, acid, Taiping Shengshi and other impurities. 2. Clean the surface of the object to be coated.
3. The air pressure is too high and the gun is too far away from the workpiece. 3. Adjust the air pressure and the distance between the gun and the workpiece.
4. The viscosity of the coating is too high or too low. 4. Adjust the viscosity of the coating.
5. The surface of the object to be coated is rough and uneven, and the polishing is incomplete. The environment is contaminated or the spray equipment is contaminated. 5. Check whether the grinding degree of the workpiece is smooth and detailed before painting.
6. Cut off the source of contamination.
Orange peel 1. The solvent evaporates quickly and the paint level is not good. 1. Reasonable use of thinner materials.
2. The paint itself is leveled. 2. Adjust the viscosity of the paint.
3. The nozzle has a large caliber and high viscosity. 3. Select the gun of the appropriate caliber.
4. The spraying distance is not good, the air pressure is insufficient, and the coating is not well atomized. 4. The air pressure and atomization effect are moderate, and the spraying distance is adjusted.
5. The surface of the object to be coated is not flat, which affects the leveling of the paint. 5. Ensure that the surface of the object to be coated is flat.
6. Water is absorbed in the paint or thinner. 6. The remaining paint or thinner should be sealed.
Loss of light 1. The surface of the coated object is moist or has acid, salt, alkali and other substances. 1. Clean up the impurities on the surface of the coated object,
2. There is moisture in the paint and thinner. 2. Keep the paint in a safe place to prevent it from getting in.
3. The surface of the object to be coated is too rough, the absorption of the coating is large, and the coating is too thin. 3. Pay attention to the thickness of the sandpaper to ensure that the surface of the object is flat.
4. The ambient humidity of the site is large, greater than 90%, and the coating is easily fading and losing light. 4. Adjust the indoor temperature or stop the construction.
5. The temperature on the site is too low, the drying is too slow, and the water gathers on the surface to cause loss of light. 5. The construction environment temperature is generally above 10 °C.
6. The moisture in the air compressor is not cleaned and mixed into the coating to cause lesions. 6. Remove moisture from the air compressor and maintain the water separator.
7. Excessive amount of diluent. 7. Adjust the construction ratio.
Cracking 1. The primer is not matched with the topcoat, and the coating film is subjected to external action (mechanical action, temperature change, etc., causing shrinkage stress, causing cracking or cracking of the paint film) 1. Primer and topcoat should be matched, and the primer and substrate should be matched.
2. The primer is not dry, that is, the coating (spraying, brushing, and roller coating) is dry; or the first layer is painted with scorpion, and the second layer of lacquer is not dried and overcoated, so that the two layers of paint are inconsistent inside and outside. ; 2. After the bottom layer is dry, apply the next coat; the first layer of the top coat should be thin and thin, and then apply the second layer after drying;
3. Indoor paint for outdoor or metal surface primer for wood. 3. Choose a suitable coating variety, especially for outdoor paints, and choose a paint with good weatherability.
4. The wooden substrate contains turpentine which has not been removed and treated. It will ooze out of the paint film for a long time, causing cracks in the division. 4. The rosin of the water quality substrate should be removed, cleaned with alcohol, and sealed with a closed primer;
5. The paint is not thoroughly mixed before painting; 5. Under suitable environmental conditions, fully mix the paint before painting.
6. The environment is bad, the temperature difference is large, and the paint film is stretched and contracted by heat and cold, causing cracks;

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