Water-based paints have a natural affinity with water, so the dispersant and wetting agent and their amount should be selected in the formulation to improve the water resistance of the film.
When the coating film is immersed in water for a long time, the swelling of the base material will cause a large volume expansion, thereby generating stress at the interface between the road surface and the coating film. When the stress is large to a certain extent, the coating film will be peeled off from the road surface. Generally, the pavement of the expressway is provided with a layer of water-permeable layer. After the rain, the marking line is generally not soaked, so the impact is not significant. The urban roads are drained by the gutters. Once the gutters are blocked, the water will not be discharged, and the markings will be soaked for a long time, resulting in empty drums and foaming until they are peeled off. Therefore, when waterborne road marking paint is used in urban roads, there must be corresponding countermeasures.
Cement pavement is also unfavorable for the marking of water-based road marking paints, because there are many capillary tubes in the cement pavement that are not visible to the naked eye, and there is a large amount of water in the capillary. This water will etch the markings for a long time. .
Once the water evaporates, a certain pressure is generated to cause the film to fall off. Therefore, it is recommended to make some improvements in the construction process, such as whether to apply a layer of sealing primer on the cement road before marking.
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