New Product Announcement: Powder Coating Additive
Last month, specialty chemicals company Evonik unveiled its new multifunctional polymer additive for powder coating formulations. The TEGO Powder Aid D01 reportedly makes the formulation easier to disperse during extrusion by promoting pigment wetting and effectively reducing melt viscosity.
According to the company, the lower melt viscosity leads to better degassing, which aids flow and leveling as the formulation cures and prevents pinholes in the coating. Because of this, the additive can optimize gloss development and ensure better Distinctness of Image (DOI) on the coating surface
“Our new product thus offers a wide range of benefits for formulators who desire one multifunctional additive for various powder coating systems,” said Maximilian Morin, Head of the Industrial and Transportation Coatings Market Segment. “TEGO Powder Aid D01 generates a large effect in small amounts and acts as a synergist with other additives.”
Evonik reports that TEGO Powder Aid D01 is applicable in formulations with inorganic fillers and pigments, along with organic pigments including carbon black, offering versatile uses. It also plays to strengths in HAA curing systems for powder coatings with water being formed as a by-product.
“The challenge during crosslinking is, that the water needs to escape from the system. This can result in pinholes or small craters in the film,” explained Bernhard Resch, Scientist in Market Segment Industrial and Transportation Coatings.
To avoid this, Evonik developed the additive to homogenize the ingredients and level the surface for low melt viscosity.
“TEGO Powder Aid D01 prevents pinholes by increasing the degassing threshold and enables the application of thicker coating films,” said Resch.
Other benefits by incorporating the additive into powder coatings include resistance to weathering, making it suitable for exterior applications and managing overbake yellowing, even at elevated temperatures. It also does not contain surface-active waxes, allowing overcoating to be possible without any problems.
“TEGO Powder Aid D01 is a new addition to the additive portfolio from Evonik´s Coating Additives Business Line, intended to be extruded into powder coating formulations,” said Resch.