The spraying method is one of the most important methods for the construction of water-based paints. A thin and uniform coating film can be obtained by coating the surface of the object with a spray method. For geometrical shapes, there are small holes, gaps, unevenness, and the coating can be distributed. Uniform. For spraying large surfaces, it is faster and more effective than brushing. However, with the spraying method, it is also necessary to master some operating techniques:
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1. Use a clean water to adjust the viscosity of the paint to a suitable spray viscosity. Use a viscometer to measure the viscosity. The appropriate viscosity is generally 20 to 30 seconds. If there is no viscometer, you can use the visual inspection method: stir the paint with a rod (iron rod or wood rod) and stir it up to a height of 20 cm to stop it. If the paint is not in a short time (several seconds) Too thick; such as a break from the bucket on the edge of the line is too thin, to stop at just 20 cm high, the paint into a straight line, the moment that the flow becomes a drop, this viscosity is more appropriate.
2, the air pressure is best controlled at 0.3 ~ 0.4 MPa (3 ~ 4 kg force / square centimeter). If the pressure is too low, the paint will be poorly atomized and pitting will form on the surface. Excessive pressure and easy to hang, and paint fog is too large, both the waste of material and affect the operator's health.
3, the order of spraying is: easy to be easy after the first, after the first outside. After the first height and then the low, the first small area after a large area. This will not cause the post-spray paint mist to splash on the sprayed paint film, destroying the sprayed paint film.
4. The distance between the nozzle and the object surface is generally 300 to 400 mm. It is advisable to hang it in a way that is too easy to hang around, paint mist is too far and uneven, and pits are easy to appear. The nozzle is far away from the object surface. The specific size of the distance should be appropriately adjusted according to the type, viscosity, and pressure of the paint. Slow dry paint can be sprayed a little further away, quick dry paint spray, a little closer. When the viscosity is thick, it can be nearer, and when the viscosity is thin, it can be farther; when the air pressure is large, the distance can be farther, and the pressure can be a little closer. The so-called farther point refers to a small range of adjustment from 10 mm to 50 mm. If it exceeds this range, it will be difficult to obtain a desired film.
5, the spray gun can be used to move up and down, left and right, it is best to run evenly at a speed of 10 to 12 meters / minute, the nozzle should be straight to the surface spray, to reduce the oblique spraying. When spraying on the both ends of the object, the hand that deducts the trigger of the spray gun should be loosened quickly, so that the paint mist is reduced. Because the two ends of the object surface are often subjected to more than two times of spraying, it is the place most likely to cause sagging.
6, when the next spray to suppress a 1/3 or 1/4, so that there will be no leakage phenomenon. When spraying quick-drying paints, it is necessary to spray them in sequence one after another.
7, when spraying in outdoor open places, pay attention to the wind direction (difficult to work when the wind), the operator must stand in the downwind direction, to prevent the paint mist from being blown into the paint film has caused an unsightly granular surface.
Construction acceptance paint coating
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