Coating knowledge: operation skill of coating spraying construction

Core tip: spraying method is one of the most important methods of coating construction When the surface of objects is painted by spraying method, a thin and uniform coating can be obtained For different geometry, there are holes, gaps and uneven places, and the coating can be evenly distributed; for large objects, the coating is faster and more effective than painting Some operation skills should be mastered in spray construction 1、 Adjust the coating to the proper spraying viscosity with the matching diluent, and measure with the coating-4 viscometer The appropriate viscosity is generally 18-22 seconds If there is no viscometer for a while, visual inspection method can be used: stir up the coating with a bar (iron bar or wood bar) and stop at a height of 20cm for observation, such as paint liquid at Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: spraying method is one of the most important methods of coating construction With spraying method, thin and uniform coating can be obtained on the surface of objects For different geometry, there are small holes, gaps and uneven places, and the coating can be evenly distributed; for spraying large objects, it is faster and more effective than painting Some operation skills should be mastered in spray construction 1、 Adjust the coating to the proper spraying viscosity with the matching diluent, and measure with the coating-4 viscometer The appropriate viscosity is generally 18-22 seconds If there is no viscometer for a while, visual inspection method can be used: stir the paint with a bar (iron bar or wood bar) and lift it up to 20cm height to stop for observation If the paint liquid continues to line in a short time (several seconds), it is too thick; if the paint liquid breaks off immediately from the upper edge of the barrel, it is too thin; if the paint liquid just stops at 20cm height, it will break and flow into drops immediately This viscosity is more appropriate 2、 The air pressure is best controlled at 0.3-0.4 MPa (3-4 kgf / cm2) If the pressure is too small, the paint liquid will not atomize well, and the surface will form pockmarks; if the pressure is too large, it is easy to flow and hang, and the paint mist is too large, which wastes materials and affects the health of the operator 3、 The distance between nozzle and object surface is generally 300-400mm Too close is easy to flow and hang; too far paint mist is uneven, prone to pockmarks, and the spray nozzle is far away from the object surface, causing waste in the way The specific distance should be adjusted according to the type of coating, viscosity and air pressure The spraying distance of slow drying paint can be a little longer, that of fast drying paint can be a little closer; when the viscosity is thick, it can be a little closer, when the viscosity is thin, it can be a little farther; when the air pressure is large, it can be a little farther, and when the pressure is small, it can be a little closer; the so-called near and far point refers to the adjustment of a small range between 10 mm and 50 mm, if it is beyond this range, it is difficult to obtain an ideal paint film 4、 The spray gun can move up and down, left and right It is better to operate uniformly at the speed of 10-12m / min the spray nozzle shall be straight on the surface of the object for spraying, and oblique spraying shall be minimized When spraying to both ends of the object surface, the hand to pull the trigger of the spray gun should be loosened quickly to reduce the paint mist Because the two ends of the object surface are often subject to more than two spraying, which is the most likely place to cause sagging 5、 When spraying, the next layer shall be pressed to 1 / 3 or 1 / 4 of the previous layer, so as to avoid leakage When spraying quick drying paint, it is required to finish spraying in sequence at one time The effect of re spraying is not ideal 6、 When spraying in the open outdoor place, pay attention to the wind direction (it is not suitable for operation in case of strong wind) The operator shall stand in the downwind direction to prevent the paint mist from being blown to the sprayed paint film and causing unsightly granular surface 7、 The spraying sequence is: hard first, easy second, inside first, and then outside First high place, then low place, first small area, then large area In this way, the spray mist will not splash on the sprayed paint film and damage the sprayed paint film Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,