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09-25-2020

For Antistatic Finishing

Waterborne and Solvent Based Lacquer Systems

Measurement of surface resistance on PVC coated fabric using Teraohm meter und ring electrode. Left side lacquered with Rowakryl G-34747W, right without lacquer © Rowa

Electrostatic charge, primarily caused by friction between two objects, can lead to sudden electrical discharges as well as other, mostly unwelcome effects. Such discharges can have serious consequences, in particular in explosion-proof areas, and are consequently to be avoided at all costs.

On account of their high electrical resistance, plastics are particularly influenced by electrostatic effects. They are therefore often provided with an antistatic treatment during the production process. As an alternative, plastics can also be given an antistatic finish retrospectively - for example by means of a suitable coating.

There are various methods of providing antistatic properties to lacquer systems: Conductive carbon black, graphite, graphene, quaternary ammonium compounds, modified mica, singlewall and multiwall carbon nanotubes or conductive polymers can be used in the corresponding coating formulations. All of these raw materials have their own specific advantages and, more importantly, disadvantages. For instance, quaternary ammonium compounds wash out over time and the antistatic effect deteriorates. Conductive carbon blacks and graphite produce a deep black coloration of the lacquer, modified mica demands a high load, and conductive polymers are usually extremely expensive.

The product range offered by Rowa Lack GmbH, Pinneberg, Germany, includes various antistatic lacquers, which can be applied to meet a variety of customer requirements, for example in the field of biogas membranes.

Very Good Slip Properties

With Rowakryl G-34747W, for example, it has been possible to design a high-gloss, water-based product with very good slip properties and a surface that is only slightly darker or grayer in comparison to that of conventional lacquers. According to the company, surface resistances of < 10 to 7 Ω can very easily be achieved with this lacquer.

Also the welding properties of the lacquered goods are maintained by means of hot air processes. Rowakril G-35198 and G-35217 are available in the solvent-based range. Once again, products with good optical and haptic properties or even good hot air weldability have been developed by a specific selection of antistatic agents.

Company profile

ROWA GROUP Holding GmbH

Siemensstr. 1-3
DE 25421 Pinneberg
Tel.: 04101 706-06
Fax: 04101 706-234

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