How to avoid the orange peel phenomenon caused by powder coating

In practice, active propellants or leveling agents are often used to improve the appearance of the film to eliminate the appearance of orange peel, shrinkage, and the like. A well-functioning active propellant lowers the melt viscosity and then aids in the mixing of the melt and the spread of the pigment to advance the wetness of the substrate. The active leveling of the coating helps to eliminate surface imperfections and facilitate the release of air.

The link between the amount of activity modifier and its effect should be investigated. The lack of use can result in shrinkage of the pores and orange peel, which can result in loss of light, haze and adhesion to the upper layer. General activity modifiers are taken during premixing. They or a masterbatch which is made into a resin is adsorbed on the inorganic carrier in a powder form. It is also good to use the additive in the powder coating at a low level of 0.5 to 1.5%.

Advance activities and leveling can reduce or prevent orange peel. The system utilizes a lower melt viscosity, extended leveling time during solidification, and higher surface tension for forward movement and leveling. Manipulating the surface tension gradient is an important parameter for reducing the orange peel, together with the outer surface tension of the coating film to obtain the smallest external product.

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Label: How to avoid the orange peel phenomenon caused by powder coating

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