I. Preface

　　At present, it is the most extensive, economical and effective way to protect the steel structure with heavy-duty anticorrosive coating; airless painting is the main way to paint heavy-duty anticorrosive coating.

　　Three paint, seven paint. Only by choosing the type of airless spray painting machine correctly and mastering the technical conditions of airless spray painting reasonably, can we achieve the purpose of coating technology of heavy-duty anticorrosive coating. The principle and process characteristics of airless spray painting machine are described in Hongxin steel ball small knitting for reference of colleagues.

　　2、 Principle of airless painting

　　Airless spray painting is to continuously deliver the paint to the sealed pipeline through the pressure pump, so as to form a high pressure in the closed space, then release the trigger of the spray gun connected to the end of the paint pipe, make it collide with the air at the speed of 100M / s at the moment when the paint is sprayed, and at the same time expand rapidly to atomize.

　　The airless painting equipment consists of power source (generally pneumatic, requiring air pressure of 0.4-0.7mpa), high-pressure pump (compression ratio of 32:1 / 45:1 / 65:1 / 73:1...), pressure storage filter (stabilizing paint pressure, avoiding nozzle blockage), paint delivery pipe (high pressure resistance, static elimination, etc., length of 5-30m), spray gun (generally hand-held, long rod gun handle up to 2m, automatic application in automatic assembly line) Agitator (electric and pneumatic, for all kinds of zinc rich primer, it must be fully stirred).

　　3、 Characteristics of airless spray painting process

　　1. High film thickness can be obtained by one-time painting

　　Because airless spray painting machine is suitable for spraying all kinds of heavy anti-corrosion coatings with high solid content and thick film (slurry), the thickness of the film can reach 250um at a time, saving labor and energy.

　　2. High spraying efficiency

　　The efficiency of airless spraying is 3-4 times faster than that of air spraying, which can reach 400-1000m2 / h. It is especially suitable for large-scale industrial painting projects.

　　3. Good coating quality

　　In particular, the coating can be sprayed after heating. Without diluent, the viscosity of the coating can be reduced and the adhesion of the coating can be increased.

　　4. High utilization rate of coating

　　Reduce the pollution of solvent coating to the environment

　　5. It can be used to spray all kinds of new heavy-duty anticorrosive coatings, such as epoxy resin coating, polyurethane coating, polyurea and other two-component coatings, which play a positive role in playing their excellent anticorrosive performance.

　　The above contents are reproduced in Li Minfeng's anthology "anticorrosive coating and coating"

　　Hongxin steel pill sells millions of tons online, which is approved by the State Administration for Industry and commerce. We are a science and technology company that faces the whole country and sets sail across the world.

　　In the past 18 years, we have provided steel shot solutions and service support for more than 4000 enterprises, which are deeply dependent on customers. Up to now, the company has a special technical team, production team and sales team. The company's sales network has been spread all over the country, specializing in the production of various steel shot, steel wire cut shot and steel sand manufacturers. The product has obtained IS09001 quality certification. Hongxin steel ball won the third China metal abrasive industry influential brand - Huazun award