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23
2019
-
09
Effect of temperature on the construction of waterborne coatings
Author：
Chuangzhi Coating
With the increasing demand for water-based paints, many people still don't know enough about water-based paints. Many problems are encountered during the spraying process. For example, when the temperature is to be reached, the construction effect will be better! Today, Xiaobian helps you understand the impact of temperature on waterborne coating construction through simple analysis!
1. Influence of ambient temperature on spray construction parameters
At present, high-grade water-based paint can be air-sprayed in the temperature range of 15-35 ° C, which can meet the construction temperature conditions of most car paint shops; when the temperature is lower than 15 ° C, the water-based paint is diluted with deionized water. The agent can't adjust the volatilization rate of the diluent by using different volatilization speeds like the solvent-based paint. Therefore, under the condition of exceeding the temperature range, it is necessary to adjust the spray parameters to complete the coating: when the temperature is lower than 15 °C At the same time, the application viscosity should be increased by 5-10s, and the leveling flashing time between the two sprayings should be extended; when the temperature exceeds 35 °C, the construction viscosity should be appropriately reduced, and the leveling flashing time should be shortened.
2. Effect of temperature on the pot life of water-based paints
The water-based polyurethane paint can meet the requirement of ≥4h under the standard temperature condition (25°C), but with the increase of the ambient temperature, the reaction rate of the polyisocyanate curing agent and water in the water-based paint is accelerated, and the pot life is shorter than the solvent. The type of coating is obviously faster: the application period is shortened to less than 4 hours at 30 °C, and the application period is shortened to less than 2.5 hours at 35 °C. When the temperature reaches 40 °C, it is shortened to 1 hour, which is not convenient for on-site construction.
Optional solutions include:
(1.) Place the formulated water-based paint in a low temperature environment (incubator, or thermostatic paint booth);
(2.) Mix paint in batches to shorten the placement time before coating construction.
The above is the relevant content of [the effect of temperature on the construction of water-based paints], next, I will introduce the information about the impact of humidity on the construction of water-based paints, welcome to pay attention to our access to updated information!
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