Dustless Coating Line of Furniture Wood Lists the Effect of High Water Content of Solid Wood Furniture Wood on Coating

Because of the high moisture content of wood, the interface between coatings and wood is in a wet state, which affects the volatilization of dilute materials and the cross-linking reaction between resin and curing agent, thus affecting the drying speed and smooth curing of coatings, resulting in non-drying or incomplete drying.

Wood must contain a certain proportion of water, no water will form wood, but because the moisture content of wood changes with the change of environmental humidity, it brings great trouble and inconvenience to painting work, so the wood must be dried before painting.

The state of water in wood: Water in wood is generally divided into chemical water, free water and absorbent water according to its combination form and position with wood. (The water content in wood is expressed by the percentage of water weight to wood weight).

Absorbing water: also known as bound water. It exists in microcapillaries between wood molecules and binds to wood physicochemically. The amount of water absorbed by the liquid coating line depends on the size of the wood surface and the number of free radicals. The average is about 24%. We usually say that the effect of water on wood properties refers to water absorption.

Conductor automatic vulcanization line

When the wood is not properly dried and the moisture content does not reach the balance point suitable for the local environment, it will start painting. Generally, it will cause poor coating film, affect color and luster, produce coating defects such as bubbles, pinholes, whitening, poor adhesion of coating film, and the wood will expand and shrink after coating of conductor automatic vulcanization line, which will cause cracking and peeling of coating film. Wait a minute. The specific impact is as follows:

Cause wet coating whitening: When wood is poorly dried, water in the wood will enter the coating with the volatilization of the thinner material, and whitening will occur. Water can not release and also affect the transparency of paint.

Production of pinholes and bubbles: Because PU paint is easy to react with water to produce gas, when the gas escapes, it will form bubbles, which will produce pinholes when the bubbles burst, resulting in film defects.

Affecting the drying and curing of coatings: Because of the high moisture content of wood, the interface between coatings and wood is in a wet state, affecting the volatilization of dilute materials and the cross-linking reaction between resin and curing agent, thus affecting the drying speed and smooth curing of coatings, resulting in non-drying or incomplete drying.

Higher moisture content will affect the colour of wood. When the moisture content of wood changes, the coating will change with the shrinkage of wood and make the colour less distinct.

Affect the adhesion of paint: wood with high moisture content, with the evaporation of water, the coating will crack, bulge, peel off, resulting in poor adhesion.

Causes the fungus to multiply: Because the water high possibly causes the decay fungus, the mold and the Chromotrophic fungus to multiply, causes the wood product decay degeneration and the damage.

Deformation of wood products: Because of high moisture content, painted wood products can still transfer water with the outside world, resulting in warping deformation of wood products due to shrinkage, resulting in damage of film and wood products.