The reasons for the color instability of PU color paste (Polyurethane color paste) during the application process are as follows:
Color paste formula problem: There may be uneven mixing or unreasonable ingredient ratios in the color paste formula, resulting in unstable color. This may be due to inconsistent quality of raw materials or errors in the manufacturing process.
Reaction temperature and time: The reaction temperature and reaction time of PU color paste have a great impact on the color stability of the product. If the temperature is too high or the reaction time is too long, some components in the color paste will change, thus affecting the stability of the color.
Light and oxidation: PU color paste is easily affected by light and oxidation, causing color changes. When exposed to sunlight or air for a long time, some of the ingredients in the color paste may undergo oxidation reactions, causing the color to lighten or change.
Storage conditions: Improper storage conditions may also cause the color of PU color paste to be unstable. If exposed to high temperature, high humidity or strong light for a long time, it will cause the degradation or change of certain components in the color paste, thus affecting the stability of the color.
Usage environment: Color paste may be affected by chemical substances, humidity, temperature and other factors in a specific usage environment, resulting in unstable color. For example, certain chemicals may react with the color paste, changing the color.
In order to solve the problem of unstable color of PU color paste, the following measures can be taken:
Optimize the formula: Make formula adjustments to ensure stable quality of raw materials and mix them in strict accordance with the correct proportion of ingredients.
Control the reaction temperature and time: Ensure that the reaction temperature and time are within the appropriate range and avoid excessively high temperatures and excessively long reaction times.
Storage conditions: Store the color paste in a dry, cool and dark environment, and avoid exposure to high temperature, high humidity, strong light and other conditions.
Pay attention to the usage environment: avoid contact with chemicals that may react with the color paste or affect its stability during use.
Through the above measures, the color stability of PU color paste can be improved, and the quality and reliability of the product can be improved.
