The weather temperature is too high, how to prevent spray paint bubbling on home decoration furniture

一

There is relatively much rain in summer, especially during the rainy season. After each rain, the air humidity is extremely high due to the evaporation of water, and the spray paint is very easy to turn white. Nitrocellulose paint It is especially obvious that attention should be paid to construction at this time. There are two prevention methods:

1. Add an appropriate amount of anti-whitening water (not exceeding 8% of the total amount of diluent) when preparing paint;

2. Dehumidify the construction site before painting.

Paint is prone to blistering in hot weather. Painters generally use less curing agent to avoid blistering. Some people even only add 50% of the standard amount! In fact, this is a misunderstanding. Reducing the curing agent cannot actually prevent paint from bubbling. Instead, it will lead to incomplete reaction of the paint, causing the paint film to become softer and the adhesion to become worse. If it is a primer, it is easy to cause bottom-biting. High-end topcoats can also cause gloss instability.

二

The main reason why paint is prone to bubbling in summer is that the paint film dries too quickly. Generally, a method of adding an appropriate amount of slow-drying water to the diluent is used (generally not More than 10% of the thinner); even if less curing agent is added, it is still recommended not to use primers and semi-matt topcoats... 1

There is relatively much rain in summer, especially during the rainy season. Every time it rains Later, due to the evaporation of water and the extremely high air humidity, the spray paint is very easy to turn white, especially the nitrocellulose paint. At this time, attention should be paid to the construction. There are two prevention methods:

1. Add an appropriate amount when preparing the paint. Anti-white water (not exceeding 8% of the total amount of diluent);

2. Dehumidify the construction site before painting.

Paint is prone to blistering in hot weather. Painters generally use less curing agent to avoid blistering. Some people even only add 50% of the standard amount! In fact, this is a misunderstanding. Reducing the curing agent cannot actually prevent paint from bubbling. Instead, it will lead to incomplete reaction of the paint, causing the paint film to become softer and the adhesion to become worse. If it is a primer, it is easy to cause bottom-biting. High-end topcoats can also cause gloss instability.

二

The main reason why paint is prone to bubbling in summer is that the paint film dries too quickly. Generally, a method of adding an appropriate amount of slow-drying water to the diluent is used (generally not More than 10% of the diluent); even if less curing agent is added, it is still recommended not to be less than 1:0.45 for primer and semi-matte topcoat, and not less than 1:0.8 for glossy topcoat.

Glossy clear topcoat is especially prone to prickly heat and pinholes in summer. The reason is: after the paint is sprayed, because the temperature is too high and the evaporation is too fast, the surface of the paint quickly forms a film, and the diluent below the surface that has not had time to volatilize penetrates outward and is blocked when it reaches the surface, forming pinpoint-like holes. The only way to solve this problem is to reduce the speed at which the paint dries. For example, lowering the ambient temperature, using slow-drying thinner, etc., reducing the curing agent can only extend the paint hardness rise time, but not the surface drying time, so it cannot effectively remove prickly heat.

Three

There are more mosquitoes in summer. During the drying process of paint, they are easy to fall on the surface of the paint film, causing the paint to be reworked. It is recommended to do the following points during rework:

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1. Polish thoroughly. Wax slurry is generally added to the topcoat to increase the smoothness. If the topcoat is not fully sanded before recoating, it will lead to delamination;

2. The sandpaper should not be too coarse when sanding. During the service process, we found that many masters use 240 or 320 sandpaper or even coarser sandpaper. The sand marks that are too coarse require re-coating with a thicker paint film, resulting in poor transparency and inconsistent colors when the panels are put together. In contrast, Use imported 320 or above sandpaper for polishing. Although the sandpaper may appear to be more expensive on the surface, only a thin layer is needed when recoating the topcoat. This saves paint and makes recoating the surface less obvious.

Four

Generally, large factories have thinners for winter and summer. It is best to use the corresponding thinners for easier construction in hot weather.