In life, we often find that after painting wood paint with water-based paint, the paint film appears milky white, or the wood grain, substrate, and background color are not clear during drying or after drying. This is why the water-based paint becomes white. Very affect the value of furniture! So why paint water-based paint on wood will turn white, how to prevent water-based paint from turning white? The following Xiaobian will explain in detail for everyone.

Causes of whitening of water-based paints 1. The air humidity is high, and there is moisture in the paint film. Water and water-based resins reflect and absorb light differently, so that the wet film looks milky and has poor transparency. When the paint film is completely dry, the water volatilizes If only water-based paint is left, the reflection and absorption of light by the water-based paint film are consistent, and the paint film becomes transparent.

2, the coating film is too thick during the construction process and the moisture contained in the underlying paint film is not removed

3. High summer temperatures and relatively high air humidity in some areas. The surface drying time of the paint layer increases with the increase in temperature, but the actual drying time is slower. In the construction process, the painter may ignore the dry time, and immediately after the surface of the paint layer is dry, another paint is applied. Causes the bottom paint layer to not completely dry, resulting in white paint

4. Water-based paints have the problem of poor water resistance, which makes the paint and bath fluids poor in stability, and the water resistance of the coating film is poor. The media of water-based coatings are generally slightly alkaline (pH 7.5 to pH 8.5). The ester bonds in the resin are easily hydrolyzed to degrade the molecular chain, which affects the stability of the coating and the bath, and the performance of the coating film.

5. Diluent volatilizes too quickly, which will also cause the surface of wood paint to become white.

Furniture water-based paint to prevent whitening common sense 1. For the problem of moisture content of the board, the board must be dried before construction to control the moisture content of the board below 12%;

2. For dark boards, use wood paint with good transparency, so as to avoid whitening problems for dark boards such as black walnut;

3. For water-based furniture in a humid environment for a long time, such as bathrooms. Ventilation should be carried out frequently to remove moisture. Wipe clean where there is standing water, and avoid soaking furniture in water for a long time.

4. The water of the bottom coating film should be dried, especially when it is milled with water.

5, do not mix water in the paint container, because this will eventually affect the proportion of wood paint mix, which will affect the final paint effect;

6. Don't apply thick coating at one time for wood lacquer construction. It should be applied layer by layer. Wait until the bottom layer is dry before performing secondary construction.

7. Do not apply when the humidity is high. If the environment does not allow it, you must face this situation. You can add appropriate slow-drying water to minimize the damage;

8. The film formation of water-based paint is based on physical cross-linking and no chemical reaction, so for furniture that has just been painted with water-based paint, it is best to have a maintenance period of 3 to 5 days to maintain the indoor air flow and temperature. The neutrality of humidity and humidity allows the paint film of water-based paint to achieve the best hardness, avoiding portrayal and collision during the period

9. The construction surface should be clean and free from moisture. By the way, you can pay attention to the cleaning of some debris, including dust;

10. Water-based paint has good recoatability. Every few years, it is best to refurbish water-based paint furniture, polish it and re-brush the water-based wood paint finish a few times to keep the paint film of furniture at home always new and durable. .