I. Overview of Epoxy Floor Coatings
Epoxy floor paint is a two-component flooring coating based on epoxy resin, which forms a hard, dense film after curing. It is widely used in industrial plants, underground parking lots, laboratories, commercial spaces, and other places. According to different usage requirements, there are various types such as epoxy thin coating, epoxy self-leveling, epoxy mortar, and epoxy antistatic.
II. Standard Construction Process Flow
Step 1: Substrate Inspection and Preparation
Check the concrete substrate strength (≥C25), flatness (2m straightedge ≤3mm), moisture content (≤8%), and surface condition. Remove laitance, oil stains, old coatings, etc. Repair cracks and pits.
Step 2: Substrate Sanding
Use a floor grinder to comprehensively grind the substrate, removing surface laitance, increasing roughness, and improving primer adhesion. After grinding, thoroughly clean the dust with an industrial vacuum cleaner.
Step 3: Epoxy Primer Application
Mix the epoxy primer Component A and Component B in proportion and stir evenly, then apply uniformly with a roller or trowel. The primer penetrates into the concrete capillaries, serving to seal and reinforce as well as to bridge the substrate and subsequent coats. Consumption is approximately 0.15–0.2 kg/m².
Step 4: Mortar/putty layer
According to the design requirements, use epoxy mortar (with added quartz sand) or epoxy putty (with added quartz powder) for leveling and repair. The mortar layer can increase the floor thickness and compressive strength.
Step 5: Epoxy intermediate coat
The epoxy intermediate coat further levels the surface and increases coating thickness and overall strength. After application, smooth it out with a trowel.
Step 6: Epoxy Topcoat Application
The topcoat is the final decorative and protective layer. Self-leveling topcoat is applied with a trowel, while thin-film topcoat is rolled on with a roller. During application, ensure uniform thickness control and avoid color variation. Coverage is approximately 0.8–1.2 kg/m² (self-leveling).
Step 7: Curing
After construction is completed, it must be cured for at least 7 days before normal use. During the curing period, avoid water soaking, heavy rolling, and contact with chemicals. At an ambient temperature of 25°C, it is walkable after 24 hours, can bear light load after 72 hours, and is fully cured after 7 days.
III. Common Issues and Prevention
| Problem | Cause | Preventive Measures |
|---|---|---|
| Shelling and peeling | High moisture content in substrate, insufficient primer penetration | Ensure substrate is dry, sand thoroughly, apply sufficient primer |
| Bubbles and pinholes | Too fast stirring, excessive temperature | Stir at low speed, choose appropriate construction time |
| Color difference | Different batch numbers, excessive construction interval | Use same batch of materials, construct continuously |