Coating classification: high pressure airless spraying technology

Core tips: 1 Principle of high pressure airless spraying High pressure airless spraying is a new process of coating spraying technology, which is totally different from the principle of general compressed air spraying General coating spraying is to use compressed air to generate negative pressure at the spray gun, bring out the coating flow and blow it into particles, and spray it to the workpiece High pressure airless spraying is not to use compressed air to spray the coating on the workpiece, but to press the coating to 10-40mpa (100kg / cm2) by high-pressure pump, and then spray it out instantaneously through airless nozzle of special shape and structure, so as to make it in hydraulic state 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 Paint Home News: 1 The principle of high pressure airless spraying is a new process of paint spraying technology, which is totally different from the principle of general compressed air spraying General coating spraying is to use compressed air to generate negative pressure at the spray gun, bring out the coating flow and blow it into particles, and spray it to the workpiece High pressure airless spraying is not to use compressed air to spray the paint on the workpiece, but to make the paint be pressed to 10-40mpa (100kg / cm2) by high pressure pump, and then spray it out instantaneously through airless nozzle with special shape and structure, so as to make the paint in hydraulic state spray into a very fine fan-shaped fog, and spray to the coated surface at high speed to form the coating When the high-pressure coating leaves the nozzle and reaches the atmosphere, it immediately expands violently and atomizes into very fine particles to spray on the surface of the workpiece Because the spraying process is formed into mist by hydraulic instantaneous spraying of the coating itself, the coating in atomized state does not contain compressed air, so it is called high pressure airless spraying 2 Characteristics of high pressure airless spraying 2.1 wide application It has strong adaptability to coating construction Up to now, most of the coatings can be applied by airless spraying, such as traditional conventional coatings such as phenolic, alkyd, asphalt, epoxy resin and polyurethane, as well as various new high-performance coatings and long-term heavy anti-corrosion thick film high viscosity coatings widely used, such as tar epoxy, epoxy asphalt and chlorine Heavy anti-corrosion coating such as chemical rubber, ultra-high viscosity coating, special coating, and even coating with coarse particles, short fibers and other special purposes, such as: epoxy glass flake coating, heat insulation, shockproof, sound absorption damping coating Hand brush, air spray and so on are only suitable for low viscosity coating 2.1 the excellent surface quality is to spray the coating into small particles and spray them evenly on the surface of the wall, so that the coating can form smooth, smooth and dense coating on the substrate This is the original method of brush and roll 2.2 The coating efficiency is high The spraying efficiency of single person operation is as high as 400-500 square meters / hour, which is 10-15 times of that of manual brushing 2.3 Improve the coating adhesion and prolong the coating life It uses high-pressure spray atomization to make the coating particles obtain strong kinetic energy The coating particles shoot into the pores by this kinetic energy, thus making the coating more compact, enhancing the mechanical bite force with the wall, improving the adhesion and effectively extending the coating life 2.4 The thickness of the manual brush coating is very uneven, generally between 30-200 microns, and the design thickness of the coating is generally 30 microns, so the effective utilization rate of the manual brush coating is low However, due to the physical and chemical diffusion and solvent volatilization in the air spraying, the paint waste is serious The coating with uniform thickness of 30 μ M can be easily obtained by airless spraying, which can save about 15% - 25% compared with other coating methods 2.5, easy to reach the corner and air gap, due to the use of high-pressure airless spray, paint spray does not contain air, paint easily reach the corner, gap and uneven and difficult to brush parts, rolling brush is very difficult to construct 3 High pressure airless spraying process conditions: high pressure airless spraying is applicable to all kinds of coatings In addition to the selection of appropriate coating equipment before coating construction, the key is to select reasonable spraying process conditions such as nozzle diameter and coating pressure Generally speaking, the coating with thin film and low viscosity should be chosen with small caliber nozzle; the coating with thick film and high viscosity should be chosen with a large calibre nozzle; if the coating is small in shape and narrow in width, spray nozzles with small width should be chosen; the nozzle with large width and wide shape should be selected for the spray pattern with wide width 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,