(1) The purpose of wood surface coating:
1. Beautify the surface - enhance the three-dimensionality of the wood texture and the touch of the surface while imparting color, luster, and smoothness;
2. Material protection - moisture, water, oil, chemical, insect, antiseptic, anti-mite, etc.;
3. Special effects - temperature indication, electrical insulation, sound insulation, heat insulation, etc.
(2) Requirements for coating of wood surface
There are two main points in the difficulty of painting the surface of wood:
1. The porosity of the water material: the pore area of ​​the wood surface accounts for about 40% of the surface area on average, and the lesser is about 30%, and the other is up to 80%. Therefore, the wettability of wood water material is a big problem in wood coating;
2. The wood is hydrophilic and expandable, the wood expands with water, and the dehydration shrinks, causing the film to crack and fall off. Therefore, the long-term stability of the film is another big problem in wood coating; in addition, the wood contains acid and grease. a substance that easily exudes on the surface. The softness of the wood texture/material structure/heterogeneity of the apparent hue is also a difficult point for wood coating. Because of the characteristics of the wood itself and the difficulty of painting. It constitutes the characteristics of wood coatings and special coating assembly systems.
(3) Requirements for coating of wood coating:
1. Because wood armor is a multi-layer supporting system, it is required that the primer has good permeability, wettability and superior adhesion to wood, and the layer should also have good adhesion between layers to form a whole.
2. The coating should have good strain force to ensure the durability of the coating film;
3. The coating should have good decorative properties to ensure the clarity of the wood grain and the obvious three-dimensional effect;
4. The coating should have good mechanical properties, water resistance, chemical resistance and pollution resistance;
5. The coating film has high hardness, strong abrasion resistance and good hand feeling;
6. The paint should have good workability, recoatability, and can be changed according to the requirements of use.
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