With the continuous improvement of our living standards, the continuous enhancement of environmental awareness, powder coating powder because of its high efficiency, environmental protection, economic advantages and rapid development.
The powder coating should be stored in a ventilated, dry and clean environment with a temperature lower than 30℃. It is strictly prohibited to be near fire sources, heaters and avoid direct sunlight.
Humid environment and high temperature, powder coating powder in the process of manufacturing, storage, transportation and use is easy to appear agglomeration phenomenon, resulting in powder spraying process blocking gun, empty gun phenomenon, which seriously affects the powder rate and coating surface flatness.
So how to store powder paint powder?
If conditions permit, it is recommended that matt powder coating powder should be stored in the following conditions: ambient temperature ≤30℃, air relative humidity ≤60% (some special coatings may have more stringent requirements, such as some transparent powder required ambient temperature below 25℃).
If the storage warehouse does not have equipment conditions to control temperature and humidity, store the powder and paint powder in a cool and ventilated warehouse, away from direct sunlight and high temperature and humidity environment such as fire sources.
The particle size of matte powder has a direct effect on the storage stability.
Considering the production cost of powder, storage stability, film leveling, coating powder rate and other factors, the normal plane powder coating powder particle size in the following range is the best:
Particle size within 10μm is less than 10% of the total volume,
Within 40μm 45%~50%,
Less than 80μm accounted for more than 90%.
Special effect matte powder coating powder can be adjusted properly.
During the grinding and screening of powder coating powder, a certain amount of loosening agent can be added appropriately to reduce the repose angle of powder coating powder, so that the powder is not easy to coalesce in the storage process.
In addition, the affinity and cohesion between film forming substances in powder coating powder can be adjusted to increase the anti-agglomerating temperature of powder coating powder, improve the storage stability of powder coating powder, and improve the flow performance of dry powder.
In addition, when electrostatic powder spraying, adding loose agent can make powder coating powder is not easy to block the spray gun, avoid agglomeration and wall adhesion phenomenon, but the maximum added amount shall not exceed 0.05%, otherwise it will affect the spraying construction and coating surface effect.
In the production of powder coating powder, sieved powder with a certain friction heat, this time should not be packaged immediately.
It is suggested to spread out the powder coating powder and let it cool before packing.
Avoid storage in places that are easily contaminated by water, organic solvents, oils and other materials.
Powder coating can not be exposed to the air casually after use, often cover or tighten the bag mouth to prevent sundries mixing.
The storage stability of the coating can be improved by choosing resin with high glass transition temperature without affecting other properties of the coating.