Canadian Finishing and Coatings Manufacturing

June 1, 2021

Evonik Industries and SI Coatings have jointly developed a water-based primer for the pretreatment of steel prior to coating in the fluidized-bed process with VESTOSINT polyamide 12 powder.

Polyamide coatings on metal serve to protect against corrosion. Until now, large-area steel parts, especially concave surfaces, were pretreated with solvent-containing primers when exceptional adhesion was required, for example, in contact with water.

“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.

The result, the company says, is a reliable water-based primer that 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 two percent.

“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.

The new primer Si Coatings 100011-00L with water hazard class WGK1 has a shelf life of six months when stored frost-free. It 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 markets the plastic polyamide 12 as a powder under the name VESTOSINT, for example, for coating dishwasher baskets, metals in household goods, the automotive industry or medical technology.

www.evonik.com 

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CFCM slingpsychrometer 400Paul N. Gardner USA, global distributors, producers, and designers of quality physical and inspection instruments for the paint, coatings, and related industries, has introduced a new offering: The compact, portable Sling Psychrometer.

As an easy way to measure relative humidity levels quickly, this uniquely compact Bacharach Sling Psychrometer accurately determines per cent relative humidity without the necessity of consulting complex tables. There is no need to wet the wick each time a reading is taken, and it contains a slide rule calculator which correlates wet and dry bulb thermometer indications for direct reading of relative humidity. When not in use, the thermometer case telescopes into the handle for protection.

The Sling Psychrometer consists of two thermometers that are turned by vigorously swinging the handle and exposing the thermometers to rapid air movement. These two thermometers are called dry bulb and wet bulb. The bulb of one thermometer is placed in direct contact with the room air to measure dry-bulb air temperature. The bulb of the other thermometer is covered with a silk or muslin sleeve that is kept moist to record the wet bulb temperature. Evaporation cools the wet bulb more than the dry bulb, and the humidity is obtained as a function of change in temperature. The atmospheric humidity is determined by calculations, steam tables, or using a psychrometric chart. Gardco.com  

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