Why does the curtain wall aluminum veneer have color difference and paint detachment? The staff of Guangdong State summarized the following reasons:

1. When processing the aluminum veneer of the curtain wall, it is mainly divided into two major stages: aluminum sheet metal processing and paint surface coating. The sheet metal processing stage mainly pays attention to the processing dimensional accuracy of aluminum veneers and the shape of aluminum plates, while the paint spraying needs to ensure that the corresponding colors meet the requirements of customers. After the sheet metal, there is an important process before spraying, called the aluminum veneer pretreatment process.

Spray and immersion. The principle is the same, the use of chemical agents, after dilution to clean the surface of the oil stains, and the formation of large holes in the surface of the aluminum plate can not be seen by the naked eye, improve the adhesion of the paint. The current treatment of the syrup soaking time is too short, when the syrup concentration is not enough, the surface oil stains and the like are not thoroughly cleaned, and the adhesion is small,

There will be problems such as poor adhesion of paint or falling paint.

2. Due to the surface painting process of the aluminum veneer, it is carried out by electrostatic spraying. Therefore, the quality, concentration and mixing process of the paint must be very careful, otherwise it will easily lead to bad results. Different batches of paint may be slightly different, even if the same batch of paint primer topcoat viscosity and dry humidity are different, this should be avoided.

3. The paint is used for a long time, the solvent is volatilized, the paint is precipitated, the paint is uneven, and similar color difference results.

4. Climate reasons, seasonal changes, resulting in changes in topcoat parameters. The stability of the oven temperature is essential for the stability of the paint on the surface of the aluminum veneer, and the constant temperature is the first element. The temperature of the drying room is uneven, which causes the curing temperature and time to change.

5, the reasons for spraying equipment, such as the problem of the paint valve, the speed of the conveyor chain changes, will affect the uniformity and thickness of the paint primer. Even with the same gunner, there will be variations in the thickness of the spray. The thickness of the spray varies, and the color will appear local and local differences.