Zinc-rich coatings are also widely used in the anti-corrosion field, and can be divided into organic zinc-rich coatings and inorganic zinc-rich coatings . Zinc-rich coatings are often used in corrosion protection projects in marine environments or heavily polluted industrial atmospheres. This is because zinc-rich materials have excellent anti-corrosion properties and weather resistance, so they are often used as primers or topcoats. use. Zinc-rich paint contains a large amount of zinc powder, which is very prone to precipitation and agglomeration, which will block the cold spraying system and damage the high-pressure pump. Therefore . Conventional airless spraying equipment cannot be used for spraying zinc-rich materials, but special zinc-rich paint spraying equipment should be selected. Zinc-rich paint airless spraying equipment has the following characteristics:
(1) With special mixing equipment;
(2) Pressure feeding mechanisms such as high-pressure pumps are made of special wear-resistant materials, including Spray Guns, nozzles and high-pressure hoses;
(3) The diameter of the paint conveying pipe and the compressed air intake pipe is larger than that of ordinary spraying equipment, and the amount of paint sprayed is large;
(4) The pressurization system and embolization system of the high-pressure pump are split structures.
For example, the pneumatic GPO9C airless spraying machine produced in CHINA is a special spraying equipment for zinc-rich coatings, and the maximum spraying volume of the coating is 51L/min; while the spraying volume of the airless spraying equipment for spraying general coatings is much lower , For example, the maximum spraying volume of CP2AI airless spraying machine is 5L/min, the maximum spraying volume of CPQ4C spraying machine is 9L/min, etc. Therefore, it is not difficult to see that the large amount of spraying is the main feature of zinc-rich paint spraying equipment.
Generally speaking, the requirements for the use and maintenance of all high-pressure airless spraying equipment are relatively strict, especially for two-component airless spraying equipment. Spraying includes the adjustment of spraying pressure and temperature, the maintenance and cleaning of the Spray Gun after spraying, the maintenance and replacement of sealing parts, and the inspection and maintenance of high-pressure pumps are the keys to ensure the quality of spraying operations. Otherwise, there will be a series of disadvantages such as unstable spraying pressure, uneven atomization of paint, and irregular spraying patterns, which will seriously affect the spraying effect and spraying efficiency.
