The role of leveling agents in water-based wood paint is crucial, and liquid wood coatings need to have good fluidity and leveling properties to ensure the formation of a flat, smooth, and uniform paint film on the surface of wood paint. If the flow and leveling are not good. The surface of the topcoat of wood paint will show defects such as brush marks, shrinkage holes, shrinkage edges, pinholes, and sagging. Wood paint is used to achieve good leveling and flowing effects.
It can be considered from several aspects:
1. Adjust the surface tension of the system (the effect of wetting agents);
2. Improve the compatibility between resin and pigment components;
3. Control the leveling performance of coatings (the effect of rheological agents);
4. Adjust the drying time (the slower the drying time, the better the self leveling property);
5. Use leveling agents to promote fluidity, provide a smooth and anti adhesive effect, and prevent shrinkage.
The effect of surface control agents on leveling:
Adjusting the surface tension of the system involves adding wetting agents. Surface control additives can also be added, usually long-chain (higher molecular weight) polyether modified polydimethylsiloxane. This type of high molecular weight surfactant. During the drying process, the surface of the paint film is oriented. Improved the smoothness of the coating surface. At the same time, it effectively reduces the surface strength of wood paint film. Leveling agents play a role in wetting and preventing shrinkage holes in wood paint coatings. Improved the smoothness and scratch resistance of the paint film. If the compatibility is too strong/too low and the dosage is not appropriate, it may cause bubbles and affect the recoating ability of the paint film. Improve surface smoothness without causing bubbles. And it has excellent recoating performance.
The influence of leveling agents on the topcoat of wood coatings
In water-based wood paint, the viscosity of the coating is very important, and it is not good to form a film if it is too thin and difficult to apply if it is too thick. The use of rheological agents can effectively improve this process. And it can achieve a very good balance between leveling and sagging performance. Polyurethane associative thickeners are commonly used in water-based systems. It can prevent dragging, sagging, settling, splashing, and effectively improve the glossiness of wood paint surfaces. The influence of auxiliary solution on the leveling performance of wood paint surface
A certain amount of auxiliary solution is often required in the application of wood paint topcoat formula. The main function of the solution is to assist in resin film formation, reduce the surface tension of the aqueous solution, improve leveling and flowability, increase system compatibility, or extend the drying time of wood paint topcoat. The commonly used auxiliary solutions are alcohol ethers and ether esters. Such as ethylene glycol butyl ether, ethylene glycol methyl ether, propylene glycol methyl ether, propylene glycol butyl ether, etc. Due to the low surface tension, strong solubility, and low volatilization rate of polyol ethers, as well as the fact that the surface tension of this type of auxiliary solution does not increase with the volatilization time, considering the strengthening of environmental and environmental awareness. It is best to choose propylene glycol and its ether esters.
