Axalta Coating Systems, a leading global manufacturer of liquid and powder coatings has developed a new one-component self-bonding electrical steel varnish called Voltatex® 1175 W - 1 K.
The new varnish provides considerably enhanced handling with the same technical performance as regular two-component systems, and a longer shelf life. Self-bonding attributes have become progressively more important in the production of superior quality magnetic cores for rotors and stators.
Self-bonding products provide crucial manufacturing advantages as they offer precise and reproducible adhesion and guarantee that the varnish is not squeezed out of bonded stacks. Self-bonding properties are in great demand, principally for the manufacture of wind-turbine generators, but also in the manufacture of motors for hybrid electric vehicles and electric vehicles.
Voltatex 1175 W - 1 K provides users with increased product reliability, more efficient processing and very user-friendly handling. An effective self-bonding one-component varnish requires a highly-sensitive and well-controlled cross-linking system to ensure that the coating’s application, drying and hardening all work well. Achieving that has always been a challenge chemically. Traditionally, it has taken advanced two-component waterborne formulations to deliver the required self-bonding performance - until now.
Frank-Rainer Boehm, Global Technology Manager, Axalta’s Energy Solutions
The company provides Voltatex 1175 W - 1 K in 200 liter drums or 1000 liter containers. It has to be mixed with the Voltatex® 1075 K catalyst in a varnish-to-catalyst weight ratio of 90:10. The pot life is one week at room temperature.