What is the reason why the large lacquer film is dark and opaque for a long time?

It is customary to think that the color of lacquer is black. In fact, lacquer is a kind of transparent paint, and the long-term blackening and opacity is caused by improper operation.

In the normal operation process, the prepared cooked paint should be stored for 3 to 4 months, and then painted after the paint is basically stable. The layers should be painted from milky white to pure black and shiny. Secondly, the transparency of the paint is related to the amount of base oil added. If there is more base oil, the transparency is good, but too much base oil will cause the paint film to not dry. It is not suitable to use kerosene as a solvent, as kerosene often causes darkening of the paint film. 1 Commonly used solvents are No. 200 solvent gasoline and dimethyl methacrylate.

Sometimes organic acid salts and inorganic acid salts are mixed into the paint liquid, or pigments or dyes are misused, which will also make the paint film always black and dull.