Floor Coating Construction Process

The floor paint uses a one-time coating process, regardless of the area size, there are no joints, and it is also a dust-free material with strong adhesion, wear resistance, and high hardness. It is currently widely used domestically. Epoxy floor paint can be divided into solvent-based and solvent-free types. Solvent-based epoxy floor coatings emit a certain amount of volatile organic compounds (VOCs) during production, construction, and curing, but they are relatively low in cost; while solvent-free epoxy floor coatings comply with environmental protection concepts and do not emit volatile organic compounds. They are widely used in modern industrial floor coatings.

Chengmei Paint Company has organized the floor paint construction process based on years of experience, which includes substrate treatment, sealing coating, putty application, intermediate layer of floor paint, surface layer of floor paint, and precautions.

1. Substrate Treatment

1. The basic substrate should be a cement smooth surface or terrazzo.

2. The substrate needs to cure for more than 28 days, and the moisture content must be below 8% before construction. If there are uneven areas or hollow spots, they need to be removed.

3. Remove surface cement slurry, old paint, and adhered debris.

4. Thoroughly remove surface oil stains using a degreasing agent.

5. Remove standing water and ensure damp areas are completely dry.

6. Surface cleaning should be completed using a dust-free sweeper and a large vacuum cleaner.

7. The allowable gap for a flat surface is 2 to 2.5mm, with a moisture content below 6% and a pH value of 6 to 8.

8. The surface roughening should be completed using a dust-free grinder and thoroughly cleaned with a vacuum cleaner.

9. Use epoxy mortar to level the ground.

10. Fill holes and obvious depressions on the floor surface with putty, and after it dries, sand and vacuum.

11. Ensure the construction substrate is dry and clean before construction.

2. Sealing Coating

1. On a cleaned and leveled concrete surface, apply a coat of epoxy sealing primer using high-pressure airless spraying or rolling.

2. Epoxy sealing paint has strong permeability, and a certain amount of thinner should be added when applying the primer to ensure that the diluted primer penetrates into the substrate, enhancing the adhesion between the coating and the substrate. The application must be continuous without interruption, and the amount applied should just saturate the surface.

3. Any missed spots can be touched up with a brush, and any excess primer on the surface must be sanded before the next process.

3. Putty Application

1. After the primer has dried (25°C, about 4 hours), use two coats of putty to ensure the floor's wear resistance, pressure resistance, impact resistance, water resistance, mineral oil resistance, and acid-base solution resistance, and to adjust the floor's flatness.

2. Use 100-200 mesh quartz sand and epoxy putty for the first coat, ensuring it is well mixed and leveled. This coat is mainly used to enhance the floor's wear and pressure resistance.

3. Use a dust-free rolling sander to grind the first coat of putty and clean with a vacuum.

4. Use 200-270 mesh quartz sand and epoxy putty for the second coat, ensuring it is well mixed and leveled. This coat is mainly used to enhance the floor's wear resistance and flatness.

5. Use a dust-free rolling sander to grind the second coat of putty and clean with a vacuum.

6. After both coats of putty have dried, if there are any rough surfaces or cracks, they should be repaired first, then sanded with a flat sander to make them smooth, and cleaned with a vacuum.

7. The mesh size of the quartz sand will be determined by Chengmei Paint's on-site engineers based on the specific conditions of the floor.

4. Intermediate Layer of Floor Paint

1. On the sanded and cleaned putty surface (20°C, 24 hours), apply the intermediate layer of epoxy floor coating. The application method can be brushing, putty application, or high-pressure airless spraying, with high-pressure airless spraying being the best for large areas, with a spraying pressure of 20-25 Mpa.

2. This layer can make the floor more level and make it easier to identify any remaining defects for the next layer of construction.

3. This layer also facilitates the arrangement of equipment installation by the client.

5. Surface Layer of Floor Paint

1. After the intermediate layer has dried, proceed with the epoxy floor coating application, using putty application and high-pressure airless spraying, but high-pressure airless spraying is preferred.

2. Before coating, the intermediate layer should be sanded with a dust-free rolling sander and vacuumed.

3. If the client has installed and debugged equipment after the intermediate layer has dried, causing new defects on the floor, use putty to level, sand, and clean before spraying the surface layer.

6. Precautions

1. The environmental temperature at the construction site should be above 5°C, and the relative humidity should be less than 85% for construction to proceed.

2. The construction personnel should keep actual records of the construction location, time, temperature, relative humidity, floor surface treatment, materials, etc., for future reference.

3. Due to the differences in the specific gravity of the components in the floor paint, the paint in the bucket should be thoroughly mixed before proportioning.

4. The floor paint should be mixed and used immediately, and the prepared floor paint should be used within 4 hours.

5. The performance of the floor paint can only be realized after the primer, intermediate coat, and topcoat are applied together and reach the maintenance period.

6. Open flames are strictly prohibited at the floor paint construction site, and good ventilation and reliable safety precautions must be taken.

7. Pay attention to cleanliness when mixing materials to avoid impurities. Construction equipment and tools should be kept clean.