As a kind of road marking paint, its superior performance and durability have been widely used. However, in the actual construction process, users often encounter the problem of blistering paint, which not only affects the aesthetics of the road marking paint, but also reduces its service life. In this article, we will discuss in detail the causes of blistering of thermoplastic road marking paint and propose corresponding solutions to help users better use this product.
Thermoplastic road marking paint blistering causes
The air in the road gap is heated
In the construction process of thermoplastic marking paint, when the temperature of the paint reaches about 200 degrees, the paint will quickly soften and adhere to the road. At this time, if there is a fine gap on the road surface, the air in the gap will expand and rise due to heat, resulting in the formation of air bubbles in the paint during the drying process. Air bubbles of different sizes have different impacts on the marking: large bubbles may top through the coating film leading to rupture, while small bubbles may remain in the marking coating or at the bottom, as well as just out of the film surface when the coating film has dried leaving pockmarks, thus affecting the overall aesthetics of the marking.
Wet ground
If the road surface is too wet, the paint will form bubbles due to evaporation of water after application. This is because water evaporates quickly at high temperatures, forming water vapor, which leads to voids within the paint, which in turn forms bubbles. Therefore, it is important to check the dryness of the road surface before application to ensure that the construction environment meets the requirements.
Alkaline-heavy cement roads and loose
Concrete roads that are too alkaline tend to absorb dust, which acts as the core of air bubbles during the application process, leading to blistering of the paint. In addition, if the cement road is loose, air bubbles will also be formed due to uneven penetration of the paint. For this reason, it is necessary to clean the road with a duster and balance this problem with the use of primer and adjusting the material temperature prior to application.
Primer is not dry
Primer plays the role of adhesion and enhancement of adhesion before paint application. If the primer is not completely dry, its solvents will evaporate when heated and air bubbles will form. In addition, undried primer can easily cause an explosion, resulting in a safety accident. Therefore, it is important to ensure that the primer is completely dry before applying the paint.
Thermoplastic road marking paint blistering solutions
Adjust the material temperature
To solve the problem of air heating in the road gap, you can adjust the material temperature to solve the problem. Reducing the material temperature by 5-10 degrees can improve the viscosity of the coating and reduce the formation of air bubbles; increasing the material temperature by 5-10 degrees can improve the leveling of the coating, reduce the viscosity and make the air bubbles easier to discharge. Specific adjustments should be made according to the construction environment and the performance of the paint to determine the test.
Ensure the ground is dry
Before construction, make sure to check the dryness of the road surface. If the ground is too wet, you should postpone the construction time or use drying equipment to accelerate the drying of the ground. In addition, you may choose to use a coating with better moisture resistance to minimize the effect of moisture evaporation on the coating.
Dealing with Alkaline Roads and Sloughing
For cement roads with excessive alkalinity, they need to be thoroughly swept with a dust collector before construction to minimize the possibility of dust as the core of air bubbles. At the same time, use primer and adjust the material temperature to balance the road loosening problem and improve the adhesion and uniformity of the paint.
Make sure the primer is completely dry
It is important to ensure that the primer is completely dry before applying the paint. This can be confirmed by observing changes in the color of the primer and using a drying test device. In addition, you can also choose to use fast-drying primer to shorten the drying time and improve the construction efficiency.
As a large brand enterprise with automatic production line of road marking paint in China, huayuan has been tested by domestic and foreign markets and trusted by thousands of users for more than twenty years. The company has a team of industry senior R&D personnel and after-sales engineers to provide users with quality products and service guarantee. When choosing thermoplastic marking paint, of course, choose huayuan to make your road marking more beautiful and durable.
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