Evonik Industries and SI Coatings have developed a water-based primer for the pretreatment of steel prior to coating in the fluidized-bed process with VESTOSINT polyamide 12 powder.
Evonik – manufacturer of polyamide 12 compounds, which are in high demand in the automotive, oil and gas, medical and sports sectors – and SI Coatings – specialist in the production of technical, functional and decorative coatings as well as adhesion promoters for a wide range of applications – have joined forced to develop a new water-based primer for the pretreatment of steel prior to coating in the fluidized-bed process with VESTOSINT® polyamide 12 powder.
Until recently, large-area steel parts, especially concave surfaces, were pretreated with solvent-containing primers when exceptional adhesion was required, for example, in contact with water.
The new primer Si Coatings 100011-00L with water hazard class WGK1 does not require any special work protection technology such as fume hoods. The product is label-free according to the Globally Harmonized System of Classification and Labeling of Chemicals (GHS). The residual solvent content, reported as volatile organic compounds (VOCs), is less than 2%. The primer has a shelf life of six months when stored frost-free and can be applied by brushing, spraying, dipping or doctoring and baked at about 300 °C during heating for the fluidized bed process with VESTOSINT. One possible application is cardan shafts, which are coated on both the outside and the inside.
"Evonik has firmly anchored the idea of environmental compatibility in its corporate strategy. Therefore, for the processing of VESTOSINT we were looking for a partner with whom we could develop a water-based primer that is precisely matched to our polyamide powder. We found this partner in SI Coatings," says Dr. Dominic Störkle, head of the Additive Manufacturing & Material Solutions product line at Evonik.
“Since we are a globally active company, we can offer the jointly developed primer to Evonik customers worldwide and also in small quantities," says Managing Director Andreas Kunz of SI Coatings, emphasizing the advantage of the partnership.