The rheological properties of water-based wood coatings can be controlled by adding leveling agents

Water based wood paint has good fluidity and leveling properties to ensure the formation of a flat, smooth, and uniform paint film. Poor fluidity and leveling can result in defects such as brush marks, shrinkage cavities, edge shrinkage, pinholes, and sagging in the paint film. To achieve good flow and leveling, several aspects can be considered: adjusting the surface tension of the system, improving component compatibility, controlling the rheological properties of the coating, adjusting drying time, etc.

The rheological properties of water-based wood coatings can be controlled by adding appropriate leveling agents to achieve a balance between leveling and sagging performance. Hydrophobic modified polyurethane associative thickeners can bind with hydrophobic groups of water-based resins to improve anti sagging performance. By using rheological modifiers with high viscosity at high shear rates, the viscosity of water-based wood coatings can be increased, the brushing feel can be improved, the brushing thickness can be increased, and the flow and leveling performance can be improved.

As a two-phase system of water and oil, water-based wood coatings inevitably suffer from surface tension imbalance, flow and equality affecting the surface properties of the paint film. This requires the addition of a certain amount of water-based leveling agent to solve the rheological problems of water-based wood coatings.