Coating technology: operation skill of water-based coating spraying

Core tip: in today's rapid development of the coating industry, all brands of coatings want to be the first However, among many coatings, water-based coating is still popular, which is a new type of coating It makes a lot of people in the industry accept it and use it widely by using its own advantages Although this is the case, there are still many people who do not have a correct understanding of water-based coating Therefore, there will be some misunderstandings in the use of water-based coating The use of paint skills for you to introduce 1 Adjust the coating with clean water Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Home of coatings news: in today's rapid development of the coating industry, all brands of coatings want to lead the way But among many coatings, water-based coating is still popular It is a new type of coating, which makes many people in the industry accept it and use it widely Although this is the case, there are still many people who do not have a correct understanding of water-based coating, so there will be some misunderstandings when using it The following is for water-based coating The use of paint skills for you to introduce 1 Adjust the coating to the proper spraying viscosity with clean water, and measure with the coating-4 viscometer The appropriate viscosity is generally 20-30 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 left and right, up and down It is better to operate evenly at the speed of 10-12m / min the spray nozzle should be straight on the surface of the object for spraying, and oblique spraying should 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 Any object or thing is not perfect, and so is the water-based coating Although it has its own advantages, there are still many problems, but we can completely improve through the above process and technology, and some problems can be well prevented 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,