1. Effect of light on color
The color of Multilayer board coated with mud lines and white embryo is likely to change with the environmental factor of light. Long-term exposure to sunlight or strong artificial light sources may cause the mud lines and white embryo parts of the board surface to fade. For the mud lines, if there are organic pigments in them, ultraviolet radiation will destroy the chemical bonds of the pigment molecules, causing the color to gradually fade. For example, if some mud lines contain blue pigments, they may turn light blue or even close to white after long-term exposure to light. As for the wood part of the white embryo multilayer board itself, light will cause the lignin in the wood to oxidize, making its color darker or yellower. This color change will be more obvious especially when there is no good surface treatment (such as painting, laminating, etc.).
2. Effect of humidity on color
Humidity is also an important environmental factor that affects the color of Multilayer board coated with mud lines and white embryo. In a high humidity environment, moisture may penetrate into the board. For the mud lines, if the mud coating material has strong water absorption, moisture entering may cause the pigment to diffuse or react chemically with other substances. For example, some pigments containing metal ions may undergo hydrolysis reaction at high humidity, thus changing color. When white embryo multilayer board is damp, wood fibers will swell, which may cause extracts (such as tannic acid, etc.) inside the wood to seep out to the surface, resulting in darker color or stain-like spots. On the contrary, in a low humidity environment, the board may dry and dehydrate, causing the wood to crack, which will also affect the appearance color of the board, making the originally uniform color mottled.
3. The effect of temperature on color
Temperature changes will also affect the color of Multilayer board coated with mud lines and white embryo. Under high temperature environment, the molecular movement inside the board intensifies. For the mud-lined part, if some polymer materials or pigments contained therein are unstable at high temperature, decomposition or polymerization reaction may occur, thereby changing the color. For example, some plastic-textured mud lines may turn yellow or brittle at high temperature. At high temperature, hemicellulose and other components in the wood of white embryo multilayer board may undergo thermal degradation reaction, causing the color of the wood to change. In low temperature environment, although it will not cause obvious chemical reactions like high temperature, low temperature may cause the moisture on the surface of the board to freeze. The expansion force of ice may destroy the mud lines or wood structure on the surface of the board. When the ice melts, it may leave traces, affecting the color and appearance of the board.
4. Color stability and countermeasures under comprehensive environmental factors
In the actual environment, multiple factors such as light, humidity and temperature often act on Multilayer board coated with mud lines and white embryo. This comprehensive effect will accelerate the color change process. In order to reduce the change of color with environmental factors, some measures can be adopted in the production process. For example, weathering treatment of the board, adding UV inhibitors and antioxidants to the mud lines to improve its stability under light; moisture-proof treatment of the board, such as coating waterproof paint or using moisture-proof glue, to reduce the influence of humidity on color; when used in high or low temperature environment, the board can be pre-treated or special protective measures can be adopted, such as heat insulation or thermal insulation treatment, to keep the color of the board relatively stable.
