The construction conditions of wood lacquer are affected by temperature and moderation. In summer, the temperature is too high and the rainwater is too heavy.
1, the film is easy to wrinkle
In summer, the temperature is too high, the solvent evaporates too quickly, and when the construction is done at high temperature, one-time brushing is too thick. The thick-coating water-based paint film at high temperature causes the paint film surface to dry quickly, but the thick inner layer dries slowly. During the drying process, the paint flow produces a difference in tension, resulting in an uneven film surface and an easy wrinkling.
2, poor adhesion of paint film
In summer, the temperature is high and the humidity in some areas is large. During the construction process, there is no grinding between the layers. The time required for the formation of a firm layer between the wet film and the dry paint film is insufficient, and the adhesion between the coating layers is not strong. Adhesion phenomenon occurs, and the layer peels from each other. It can even be peeled off like a peeling skin.
3, film cracking
This phenomenon is also common in summer construction. In the process of construction, the film thickness of the paint layer is too thick, which results in fast film drying on the surface layer, while the thick inner layer is slowly drying, which directly causes cracking of the primer.
4, paint white
The main reason is that the humidity in the construction environment is too high and the coating film is too thick during construction. Because of the high temperature of water-based real stone paints in summer, the humidity in some areas is relatively high. The drying time of the lacquer layer accelerates with the increase of the temperature, but the drying time is relatively slow. After the lacquer layer is dry, the painter immediately applies another lacquer, which results in the bottom lacquer layer not completely dry on rainy days or Humidity of the weather, easy to produce lacquer white phenomenon.
Causes of these paint defects:
1. The reason for the substrate itself
Because the moisture content of the substrate is different, if the moisture content of the substrate exceeds the standard, it will affect the quality of the paint film. Especially in wet weather, the moisture content of the wood will be higher. Therefore, it is not surprising that the disadvantages of the above paint film are not obvious. Controlling the moisture content of the substrate is the basic guarantee for good quality.
2. Reasons for substrate treatment
Improper handling of the substrate can also cause the above defects. If the substrate is not closed properly, it is impossible to seal the oil and water under the paint. This can lead to the above-mentioned problems.
How to solve the paint problem?
How to solve it? In addition to on-site manual handicrafts and remediation for experienced painters, here we have problems with lacquer, bubbles, and pinholes on the paint film after painting. Make the following suggestions for your home painting construction:
1. The environmental temperature of construction paint should not exceed 30°C.
The construction environment will directly affect the final quality of the paint film. The best temperature in the construction environment is 25°C. At least, the indoor temperature should not exceed 30°C. The painting room and the drying room must maintain smooth ventilation. This is to ensure the paint film. The important conditions of quality.
2. Control of construction paint thickness
During the summer coating construction, due to the high temperature, the coating should not be thick, because the paint solvent evaporates quickly, resulting in a relatively fast surface drying speed, coupled with a thick paint film, it can easily lead to the appearance of the paint film surface Dizziness, bubbles, and pinholes.
3. Adding less curing agent to prevent foaming is a misunderstanding
Paints in high temperature are prone to blistering. Painters generally use less hardeners to avoid foaming. Individuals even add only 50% of the standard amount! In fact, this is a misunderstanding. Reducing the curing agent does not substantially prevent the paint from foaming. Instead, it will cause the paint reaction to be incomplete and cause the paint film to become soft and have poor adhesion. If it is the primer, it may easily cause bite bottom phenomenon. High-grade topcoats also cause gloss instability. Therefore, this method is generally used to add appropriate amount of slow-drying water in the diluent (usually no more than 10% of the diluent); even if less curing agent, primer and semi-matt paint is still recommended not less than 1:0.45 The gloss finish should not be less than 1:0.8.
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