Insulation, corrosion, wear protection, self-cleaning, medical approval and a great appearance: Even with miniaturized systems, surfaces feature functionality, long-term properties and a high-quality look and feel. We have developed a procedure that makes it possible to attach polymer coatings with the desired properties.
Surface properties depend on the coating material and process. Plasma, painting, or electrostatic coating processes often lead to layers with mechanical stress, low adhesion forces between the coating and base material, or they impede localized coatings.
The basis for our procedure for separating thermoplastic polymers in layer thicknesses or a few micrometers up to several hundred micrometers is the polymer characteristic of charging in an electrical field. Temporarily charged polymers are pulled onto a surface by means of electrical voltage and coat it. Because this process is performed in a liquid, it is known as electrophoretic deposition (EPD). This process is principally known from the coating of macroscopic components (e.g. car bodies). Our combination of material and process, however, also enables polymer coatings on very small three-dimensional components. In addition to defined, reproducible material properties and variability in the coating thickness, the new process has other benefits such as homogeneous coating of complex components, simultaneous coating of macroscopic and microscopic sections, as well as material-efficient and resource-efficient deposition. Typical fields of application are medical technology, battery technology, optical technologies or modification and functionalization of sensors.