Glass flake coating is filled with a special treatment of scale glass in a thermosetting resin. Since the glass flake is arranged in an overlapping manner in the coating, it plays a significant role in the penetration resistance of the coating film. The coating method may be brush coating, high pressure airless spraying or roller coating. Today, Xiao Bian wants to introduce the glass flake coating for everyone. Look at the characteristics of glass flake coating and how it is constructed.
Glass flake coating characteristics
1) The permeability of chemical media, gases, and vapors is much smaller than that of FRP liners, and it is difficult to cause the phenomenon of water vapor diffusion. This is due to the fact that the glass flakes that are layered in layers overlap each other and cause a long penetration distance.
2) The shrinkage is low at the time of curing, and the residual stress of the adhesive surface is small due to dispersion.
3) The coefficient of thermal expansion is small, the thermal stress of bonding is correspondingly small, the heat resistance temperature is high, and the thermal shock resistance is good.
4) The mechanical strength is not as good as the FRP lining, but it is excellent in abrasion resistance and scratch resistance, and it is limited to mechanical damage. 5) Glass flake coating construction process performance is also very good.
Glass flake coating construction process
First, the surface treatment of the substrate
1. Surface pretreatment means the removal of oil stains, various attachments, and thick rust layers on metal surfaces. Mechanical or chemical cleaning methods can be used.
2, surface treatment can be used manually, mechanical or chemical pickling and other methods. For larger areas, more demanding equipment, commonly used sand blasting methods, after sandblasting requirements to achieve more than two standards, metal near white.
Second, coating and testing
1. After sandblasting with a primer, before the surface of the crucible is not dried, paint or spray 1 to 2 coats as quickly as possible, with a thickness of 30 to 100 μm.
2, painted intermediate paint. Can be painted, wiped, rolled, sprayed.
3, brush, coating, rolling or spraying for the film (0.2 ~ 0.4mm) and the middle film (0.4 ~ 1mm), can be coated with 2 ~ 3 thick paste type coating to achieve the required thickness.
4, trowel applied to more than 1mm thick coating, generally 1.5 ~ 2mm coating can wipe 2 clay, can also be used to achieve more than 3 thick paste paint. For structures that need to be combined with FRP, one or two layers of glass cloth or glass fiber surface mats and chopped strand mats can also be used to cover a certain thickness (1.5 to 2 mm) of glass flake coating. The total thickness can reach 3 to 4 mm.
5, coated surface layer generally 1 to 2, 50 ~ 100um.
6. Testing To ensure the quality of the coating, quality inspection must be performed after the coating is applied. For thicker coatings, an additional inspection may be performed at the time of construction to intermediate thickness. The test content is as follows.
7. Appearance inspection, mainly using visual inspection methods, to see if the coating is leaking, sagging, uneven thickness and uplift, peeling and other abnormal conditions.
8. Check the hardness and wipe the surface with a Barcol hardness tester or solvent to see if the coating cures completely.
9, pinhole test, using the discharge pinhole detector to check the full paint film, no pinholes.
10. Thickness inspection. The thickness of the coating shall be measured by an electromagnetic thickness gauge.
Third, coating maintenance and maintenance
Normal summer should be put more than 5 days, winter should be more than 10 days, such as early use can be abdominal heating method to speed up the curing process, can be cured at 60 degrees for 4 hours, then 80 degrees curing 2 hours.
The above is the introduction of the related content of glass flake coating, I hope to help you. For more information on coatings, please continue to pay attention to information on this site.
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