Coating technology: Can slow-dry solvent solvent solve the tweezers problem?

China Paint Online News Information
Every summer, the tweezers are an important problem that every coating engineer has to face, when it comes to tweezers, perhaps many people's first reaction is to slow down the dry solvent, then slow-dry solvent will certainly solve the problem of tweezers?
to solve the problem of tweezers, we must first know the cause of tweezers. After coating construction is completed, solvents, moisture and air in the paint film gradually migrate to the surface and evaporate during the drying process. In this process, the change in the surface of the paint film will be such a process: the production of bubbles - bubble bursts - paint film reflow. If the surface drying speed of the paint film is too fast, solvents, moisture and air can not be waved out in time, or waved away after the paint film can not be reflowed, then the surface of the paint film will form a dense small bubble, these small bubbles are tweezers.
Inlarge 60 times the tweezers
from the cause can be seen, to solve the tweezers problem, the best way is to extend the drying time, that is, to extend the opening time of the paint film, at the same time to make the paint film dry slower than solvent, moisture and air evaporation speed. The addition of slow-drying solvents can extend the drying time of the paint film, which is helpful to prevent the starting of tweezers. However, the addition of too much slow-drying solvent, will lead to solvent volatility rate is much lower than the paint film table dry speed, but not conducive to solving the problem of tweezers, but also may lead to other problems such as hanging, dark bubbles and so on.
therefore, in solving the problem of tweezers, slow-drying solvents are not lmnary, the most important thing is to balance the drying time of the paint film and the evaporation rate of solvents, moisture and air. If it's just slow-drying and slow-drying, then it's just delaying the emergence of tweezers, and you can't completely solve the tweezers problem.
to extend the drying time of the paint film, you can directly adjust the film substance (e.g. curing agent, etc.), or you can extend the drying effect by adding additives. Such as Guangzhou Oupeng Chemical Co. , Ltd. MODAREZ PW336 can play a role in the water-like system to extend the opening hours of lacquer film.
in the elimination of bubbles, the addition of de-foaming agents to prevent tweezers will also have a role. Such as Guangzhou Oupeng Chemical Co. , Ltd. MOUSSEXSF561 is a water-like and oily system can be used de-foaming agent, after construction can quickly bring out the bubbles in the paint film, thereby preventing the production of tweezers.
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