Water-type industrial paint six common problems and solutions classified!

Water-like industrial paint is often used in engineering machinery, rail transportation, automobiles, protection and other fields, these areas for the quality of water-powered industrial paint and construction also have strict requirements. Due to the characteristics of water-based industrial paint, there are often some problems in construction projects due to environmental, technical and other factors. Therefore, for the construction process of common problems and solutions, the author also combined with the following situations to learn to share

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1, bulging is also known as floating wrinkles. During the spraying process or during the drying of the paint film, the bulging formed in some areas due to the expansion of the paint surface may take on different shapes. Cause: 1, the bottom layer has not been thoroughly cleaned, such as the bottom surface of the grease or wax material has not been completely removed, due to the effect of the mezzanine effect, resulting in re-sprayed paint can not be attached. 2, the interval between secondary spraying is too short, did not give the bottom coating sufficient drying time, resulting in moisture erosion in the wet paint surface in the paint coating or paint to soften it. Correction method: If the imprint is more obvious, the coating layer should be polished off and re-sprayed. 2, hanging is also known as tears or tears. The coating partially thickens, tearing due to gravity, and occurs only on the surface of the sprayed surface when vertical or vertically sprayed. Cause: 1, spray gun improper use. For example, low compressed air pressure, or too close to the spray surface of the spray gun, or too slow movement of the spray gun, will increase the likelihood of hanging phenomenon. The shape of the spray beam and the jet pressure should be adjusted appropriately to keep the injection distance at 20-25cm and the gun should move evenly. Grasp the limit spray amount that produces the flow hanging, concentrate on the situation of the formation of the paint film while spraying. 2, spray workshop temperature is too low, spray paint layer is not easy to dry, or one-time spray paint layer is too thick, resulting in paint drying speed is too slow. Correction method: When the phenomenon of flow hanging is mild, the defective area is wetly polished with fine sandpaper after drying, and when the hanging phenomenon is serious, the defective area is polished and repainted. 3, wet printing or under the coating wax marks from the surface of the paint layer can be seen the bottom of the contours of contaminated areas, or a variety of shapes of lightless spots. Cause: 1, before spraying did not thoroughly clean the underlying surface, such as grease or wax substances are not completely removed. 2, the previous paint layer dry or old paint layer defects have not been removed. Correction method: If the imprint is more obvious, the coating layer should be polished off and re-sprayed.
4, water-stained paint surface appears white or yellow corrosive spots, mostly on the roof, bonnet or luggage lid and other surfaces perpendicular to the sun. Cause: 1, the coating layer in the absence of sufficient drying contact with water droplets, especially high mineral content of water. When water droplets are mixed with moisture in the paint, they seep into the paint, leaving traces of water. Therefore, spraying soon paint is strictly prohibited from contact with water, is strictly prohibited from driving on rainy days. 2, even dry paint, if frequent contact with water droplets will leave water mark on the surface of the paint. In the sun, water droplets have a magnifying glass transmission focus function, water droplets dry will leave a white or yellow corrosion profile on the paint. 3, if the spray paint is too thick, it will extend the drying time, paint contact with water droplets left a greater chance of water traces. Correction: Use a finer polish or a thicker polish, depending on the depth of the water mark. In the case of water mark is particularly serious, after a few days of polishing water mark will reappear, should be repeated many cleaning, can completely eliminate water mark. If cleaning is not effective, re-spray the area of the water mark with fine sandpaper wet. 5, silk, that is, silver powder reflective uneven. Silver particles are arranged in the same direction, showing streaks of light and dark. In most cases, the deposited silver powder punctures the paint film if the trace appears on the vertical surface. Cause: 1, silver paint is a mixture of pigments, moisture, a certain size of metal particles and additives, metal particles in the pigment distribution ratio will affect the color of the paint. If the silver paint is not fully stirred before spraying, the metal particles will be deposited at the bottom of the container, resulting in too many metal particles in the bottom of the paint, so that the paint film is too thick, the paint color is uneven. 2, the construction viscosity of the paint is not correct, that is, the dilution ratio is problematic. Dilution of viscosity through the high will appear silk, metal ion aggregation phenomenon, sticky through the low paint film is too thin, paint film performance will be poor, must choose to take into account the two requirements of the appropriate viscosity. 3, each spray time interval is too short. If the silver paint is not sufficiently dry, there will be uneven distribution of metal particles. 4, spray gun adjustment is not proper or paint technology is not good. Compressed air pressure is too low, or the spray gun and spray surface is too close, or the speed of the spray gun movement is uneven, will cause the silver paint surface between the dark phase phenomenon. Correction method: the paint surface with fine sandpaper water after re-spraying, or to be completely dry after the paint to increase the compressed air pressure, increase the distance from the spray gun to the spray surface to 40-50cm, and then spray a layer of using fast drying silver powder paint. 6, fish eye is also known as shrink hole or bead hole. Round pits appear on the paint surface, sometimes dispersed and sometimes clustered. Cause: 1, primer surface pollution, such as primer oil, so before spraying must be clean spray surface, you can use neutral cleaner. 2, the gun used in the compressed air for strict filtration, to ensure the purity of compressed air, because silicone is often found to come from compressed air pipes rather than paint. Drain and clean the compressed air filter daily to remove moisture and dirt from the filter and drain the air compressor daily. Correction: Clear the affected area and repaint it.
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