Waterborne epoxy resin coating is called "green coating". Green environmental protection is the theme of today's world and a manifestation of the progress of human civilization. Waterborne epoxy resin coatings have intentional metal adhesion and corrosion resistance, as well as good chemical stability and adhesion properties, so waterborne epoxy resin coatings are currently the focus of research in various countries.
Application of water-based epoxy coatings Due to the excellent performance and characteristics of water-based epoxy resins, it is widely used in roof leakage prevention, airport runways, viaduct pavement reinforcement, parking lots, sports grounds, factory floors, walls, ships, decks, Basement and warehouse, aircraft carrier apron, tunnel and other fields.
At present, the floor industry is mixed with fish and dragons, and the construction standards are not uniformly stipulated, so this and other problems will arise.
Primer shedding: Usually water-based epoxy resin coatings use water as a diluent and have a higher surface tension than oily epoxy resins, and insufficient wetting ability with the substrate. Cause the adhesion between the primer and the substrate to drop and fall off. Before construction, the cleaning of substrate dust and the like is not easy to cause the adhesion to decline.
Solution: Choose a water-based epoxy resin with good penetration ability; adjust the appropriate viscosity and solid content; add a wetting and leveling agent when making the paint; in order to improve the binding force, the roller coating method must be used during the construction of the primer, and it cannot be scraped Painted. Fully water-based epoxy resin A and B components are easy to mix on site, have good compatibility and uniform particle size, and have good penetration and curing properties on the substrate. Before construction, substrate treatment.
The problem of poor curing of the primer and back tack, insufficient mixing of the two components, affecting the coating performance.
Solution: Strengthen on-site construction management and use fully water-based epoxy resin as the primer.
The middle layer is cracked and warped: the solid content of the water-based epoxy resin A and B components is too low; the amount of water, sand and powder added to the intermediate coating is too large. At this time, although it has a squeegee viscosity similar to oily epoxy, it has few effective substances and is insufficient to wet and wrap the substrate and filler.
The intermediate coating is thick, and the moisture can not cause the cured coating to warp even if it evaporates in time before the water-based epoxy is normally formed.
Solution: water-based epoxy intermediate paint production is fixed to add water, the finished paint does not need to add water. The amount of powder and sand added on site should be accurate; air circulation should be maintained during construction. The thicker coating can add cement and quartz sand.
The surface layer has roller printing and uneven gloss: the pigment dispersion is insufficient in the production of the coating; after the components A and B are mixed, the placement time is too long, the material properties change; the local thickness difference during coating is large, and the moisture release is slow.
Solution: The water-based epoxy resin floor paint A and B components should be used up within 30-40 minutes after mixing, with air circulation on site and uniform coating thickness.
The surface part has poor strength and powder loss: After the water-based epoxy resin A and B components are mixed and stirred on site, the material has not been used up for a long time, the internal molecules of the paint increase, and the film forming performance decreases, resulting in a decrease in the strength of the coating.
Solution: After the water-based epoxy resin A and B components are mixed and stirred on site, the materials are used up within the specified time.
Cracking and peeling of the surface layer: 5-7 hours after the topcoat is applied, the local depression or the thick part is not dry. After 1 to 2 days, the surface is cracked and peeling, usually because the thick part, the moisture release is too slow, the paint After the reaction and film formation, a large amount of water was not released in time.
Solution: Control air humidity on site, maintain good ventilation, and keep the thickness as uniform as possible during painting.