How to prevent epoxy floor cracking?

Defect status:

(1) Epoxy floor fine cracks: After the coating film is applied, it is difficult to identify with the naked eye, but it can be clearly observed with a tenfold microscope. It is the rupture of the surface of the coating film caused by the shrinkage force inside the coating exceeding the cohesive force of the coating film itself. It does not damage the beauty of the coating film and is the inevitable result of the aging of the coating film. But if this happens soon after painting, it's a pathological condition.

(2) Coarse cracking of epoxy floor: The coating film produces obvious coarse cracks shortly after coating, and sometimes the bottom is visible.

(3)) Epoxy floor cracks: After the coating film is coated, the shape is similar to the cracks on the tortoise back. A similar phenomenon occurs in crocodile skin cracks and glass cracks.

Epoxy floor cracking reasons:

1. After the coating film is dried, the hardness is too high, and the flexibility is poor, such as the coating prepared with fatty acid containing a common double bond or its ester;

2. Apply a second coat of paint before the first coat is dry, and the inner and outer stretches of the two coats are inconsistent;

3. The coating is not properly matched, for example, the primer layer is softer than the topcoat layer;

4. There are too many volatile components in the epoxy floor topcoat, which affects the bonding force of the film and causes the coating film to dry and crack;

5. The coating is too thick, the surface layer is dry but the inner layer is not dry;

6. Excessive amount of drier or improper combination of various driers;

7. The coating film is applied in the environment with polluted gas (such as sulfur dioxide, ammonia, etc.);

8. The color paint is not stirred evenly before use, the upper layer has more resin and less pigment, and the lower layer has more pigment and less resin, which is easy to crack after painting;

9. The coating has poor weather resistance or temperature resistance

Epoxy floor cracking treatment countermeasures:

1. The hardness of the topcoat should not be too high, and attention should be paid to the flexibility of the coating film in the coating formulation;

2. The second coat should be applied after the first coat is fully dry;

3. Solve the compatibility of the coating through the test, generally make the hardness and elasticity of the primer coating 4. and the topcoat close to;

5. The volatile components of epoxy floor topcoat should not be too much;

6. Each coating film in epoxy floor construction should not be too thick;

7. Pay attention to the dosage and collocation of the drier;

8. Construction and long-term use in a polluted environment should be avoided;

9. The color paint should be fully stirred before construction;

10. Pay attention to the ambient temperature of the paint;