Mar 13, 2023
Why does the white paint change color when the horizontal sand mill grinds it? What causes it? Below, we will analyze in detail for you:
First, the problems of white pigment itself, such as coating and surface treatment. Because I am not a paint maker, I will not analyze the main ones. You need to know if there is a problem with this white pigment.
Second, the formula problem, such as what is the problem with the dispersion resin and auxiliary dosage, the thickener and resin are likely to change when the sand mill is grinding, which will cause discoloration. In addition, if the grinding time is too long, the particle size of the white pigment will be reduced, and the appearance will be dulled, which may also cause discoloration. You can try this with the general recipe first, and then try with your recipe to see if there is any problem.
Three, the problem of horizontal sand mill. First of all, there are high requirements for the ground white pigment of the barrel material of the horizontal sand mill. The strength should be high, and it cannot chemically change with the raw materials. Secondly, the grinding material of the sand mill mainly chooses high-toughness zirconium beads. And don't need to add much. Also, when grinding white paint, be sure to clean the other colors that have been ground by the sander before. Otherwise it is easy to change color. For generally larger manufacturers, it is recommended to use a special horizontal sand mill for grinding white pigments.
To sum up, there is a situation where the white pigment is discolored by grinding it with a horizontal sand mill, and it can be dealt with by removing it one by one according to the above method. It is also necessary to add that your product is stable at high temperature and whether it is oxidized in the air.
