How to deal with impurity ions in color electrophoretic paint, is there any way?
In the production process of color electrophoretic paint, sometimes it is unavoidable that there are too many impurity ions in the electrophoretic paint due to various reasons. Too many impurity ions will cause a lot of quality problems in the coating film of the electrophoretic paint: destroy the stability of the electrophoretic bath, reduce the quality of the electrophoretic paint film, and reduce the utilization rate of the electrophoretic paint. So is there any way to deal with the excessive impurity ions in the color electrophoretic paint?
If it is determined that the quality of the cathodic electrophoretic paint film is caused by impurity ions, then we can solve the problem of high impurity ions in the electrophoretic paint by means of ultrafiltration and ultrafiltration.
In the process of electrophoresis bath ultrafiltration, we should pay attention to the following issues:
1. Before discharging the ultrafiltrate, check whether the ultrafiltration membrane tube is damaged. If it is damaged, it must be replaced immediately to prevent the loss of the electrophoretic coating when the ultrafiltrate is discharged.
2. Determine the content of impurity ions according to the high conductivity of the bath and the area and extent of the "toad skin" of the cathodic electrophoretic paint film, and determine the discharge amount of the ultrafiltration.
3. Instantly measure the solid content, pH value, conductivity, temperature of the tank liquid, and do a contrast test of the solvent content of the tank liquid, and make a registration.
4. In order to keep the solvent content of the bath relatively stable before discharging the ultrafiltrate, a certain amount of solvent needs to be added to the electrophoresis tank first. The solvent content in the entire electrophoresis tank can be maintained after the ultrafiltration is discharged according to the solvent content of the plant fluid and the discharge volume of the ultrafiltrate.
5. While adding the solvent, keep the tank fully stirred.
6. In order to avoid excessive and wasteful discharge, we should separate the ultrafiltration in batches. First, discharge 1/3 of the total amount of the bath solution. After the discharge, the proof test and the solvent content test. You do not need ultrafiltration, or you have to continue ultrafiltration. At this time, when the total amount of ultrafiltrate discharged again reaches 1/2 of the original bath solution, the test sample is proofed again until the paint film is completely normal. Then measure the various process parameters of the bath, adjust to within the normal range and resume production.
The content mentioned above is a solution to the excessive content of impurity ions in the color electrophoretic paint. In the process of electrophoretic coating, in addition to the problem of excessive impurity ions, there will be various other problems. For these common paint film problems, we cannot completely avoid them, but we can prevent and solve them through various methods. For more questions about electrophoretic paint, you can consult the technical engineer of Hong Heshun. Tel: 0755-89264486.