The orange peel phenomenon of water-based coatings refers to the formation of a raised structure similar to orange peels on the surface of the coating. This phenomenon is usually related to certain factors during the coating construction process. Common causes of orange peel in waterborne coatings include:
Poor rheological properties of coatings: some additives such as dispersants and thickeners are usually added to water-based coatings. The types and methods of use of these additives will affect the rheological properties of coatings. If the rheological properties of the paint are poor, it will lead to poor fluidity of the paint during the construction process, resulting in orange peel phenomenon.
Poor construction environment: When applying water-based coatings under high temperature, low humidity and other environmental conditions, it may cause insufficient volatilization or excessive drying of the coating, resulting in orange peel phenomenon. In addition, during the construction process, there may be wind blowing dust, etc., which will also affect the quality of the coating surface.
Improper coating process: parameters such as coating method and coating thickness will also affect the quality of the coating surface. If the coating is unevenly applied, the coating thickness is too large or too small, etc., it will cause orange peel phenomenon on the coating surface.
The solid content of the paint is too high: If the solid content of the water-based paint is too high, it will cause the paint to gel during construction, which will affect the quality of the coating surface.
To avoid the orange peel phenomenon of water-based coatings, the following measures can be taken:
In practical application, the appropriate coating should be selected according to the material, application and construction environment of the coating object to ensure the rheological properties and drying performance of the coating.
During the construction process, the temperature, humidity and other factors of the construction environment should be controlled as much as possible to avoid insufficient or too fast drying of the paint.
Before the coating is applied, the coating process should be carefully planned and adjusted to ensure that the coating method, thickness and other parameters are reasonable.
During the production and processing of coatings, the solid content of coatings should be controlled to avoid changes in coating properties caused by excessively high or low solid content. At the same time, it is also necessary to fully stir and mix the paint to ensure that the components of the paint are fully dispersed and uniform, and to reduce the risk of orange peel phenomenon on the coating surface.
In short, to avoid the orange peel phenomenon of water-based coatings, it is necessary to comprehensively consider and control the selection of coatings, construction environment, coating process and solid content of coatings. For coatings with orange peel phenomenon, targeted repair and treatment measures can be taken to ensure the smoothness and aesthetics of the coating surface.
