Zinc silicate primers are a solvent-rich mineral coating based on moisture-curing type that are often supplied in two parts and three parts.
Zinc silicate primers are used to protect metal surfaces in humid-marine-industrial environments and coating systems resistant to 400 ° C. Applying the following points in applying this coating will ensure proper performance of this coating.
Zinc silicate primer is available in both two-part and three-part:
Part A: Contains a clear, colorless solution (sometimes yellowish).
Part B: Contains zinc powder with suitable purity.
Part C: Contains thickeners, anti-fouling agents and additives to improve properties.
In two-component systems, component C is located in components A or B.
Since surface preparation and application have a great impact on the performance of this coating. Therefore, sufficient attention and accuracy in these steps will ensure the performance of this coating.
All surfaces must be free of any contaminants such as grease, oil, grease or chemicals. Therefore, before sand blasting operation, such contaminants should be cleaned by washing with high pressure water or thinner wash. Also, all traces and remnants of welding should be removed from the surface by mechanical sanding tools.
Thin points and edges are energetic points and the possibility of proper cleaning or proper thickness and priming in those areas is very low. Therefore, it is suggested to reduce their sharpness with the help of mechanical tools such as sandpaper.
All surfaces must be blasted in accordance with ISO 8501-1-2007 to a minimum degree of cleanliness of 22 cm. (Sa3 cleanliness increases system life). The surface roughness should be at least 60-40 microns. Less roughness reduces the adhesion and cracking of the liner.
The compressed air used in sand blasting must be free of moisture and oil. After sand blasting, the remaining particles and dust should be cleaned from the surface with the help of vacuum.
Zinc silicate primer can be applied with the help of air spray or airless spray, which are listed below.
Compressed air must be free of moisture or oil.
Clean tools and equipment immediately after using the washing thinner.
Zinc silicate primer is usually applied in dry film thickness of 50-75 microns (140-90 microns wet film).
Applying it at a thickness of more than 120 microns will cause cracking after cooking. .
Zinc silicate primer should be applied in one layer only. Avoid applying it in two layers or more separately.
Since this primer is cured with moisture, it needs at least 60% relative humidity to cook at 25 ° C. Under these conditions, this primer is baked after 24-48 hours. In conditions of temperature less than 10 ° C or relative humidity less than 50%, be sure to contact Pars Shamin company before application. (The final curing time of the paint will change a lot)
If the applied paint film is not completely dry and hard, it prevents the next layer from sticking to it. Therefore, to be sure, apply a soft white cotton or cloth soaked in MEK solvent about fifty times back and forth on the film. Do not cause it to harden completely and the next layer is unobstructed.
The next layer is applied after the hardening method test is positive. The maximum time for applying the next layer is 4 days (in this case, the maximum time for applying the next layer is not mentioned, just before applying the next layer, make sure that the primer surface is clean and there is no white rust on the surface ..)
If there is salt or white rust on the surface of the primer, before applying the next layer, the salts formed on the surface should be removed by sanding, rinsing with water pressure or even a gentle blast.
Evil environmental conditions of applying paint:
The relative humidity of the environment should not be more than 85%.
At temperatures below 10 ° C, the drying time and the application of the next layer will be longer.
Do not apply paint at temperatures below 5 ° C.
The working surface temperature should be at least 3 ° C above the dew point.
Painting should be done in a well-ventilated environment.
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