EASYCLEAN
Evaluation of quality and durability of easy-clean surfaces by a new robust analysis methodology

Background
A number of different functionalities may be given a  surface using different technologies. One function that one wishes to achieve is the function of easy cleaning, which is related to pick-up and adhesion of dirt, surface structure and wetting properties. Surfaces that are easier to clean or even self-cleaning are of great interest for many applications, e.g. automotive coatings, automotive exterior plastics, coil coatings, façade coatings and so on. These types of easy-clean materials are under development and to some extent also used, but the knowledge of the efficiency of these materials is somewhat limited and long-term properties are widely disputed.

The problem with road dirt contamination of vehicles is a worldwide problem. However, the condition on Nordic winter roads is somewhat special due to the use of de-icing agents, sand and studded tires. To customers in Sweden, road dirt on vehicles during the winter season is a particularly pronounced problem. Introduction of functional easy-clean surfaces to the Swedish automotive industry would therefore lead to increased customer satisfaction. There should also be considerable environmental advantages, since the use of chemical cleaning agents would decrease.

Methods
A washability test method, based on application of artificial road dirt followed by high pressure water cleaning, has previously been developed and will become an important part of the final methodology. The washability test method makes a good base for evaluation of easy-clean surfaces, but further studies on the robustness of the method is needed as well as studies on the effects on the functional surface of ageing et.c. To evaluate and better understand the functionality and the ageing bahaviour of these kinds of  surfaces, advanced analyses will be used in combination with exposures to weathering, chemicals and mechanical impact.

Materials
It should be pointed out that this project is not about developing easy-clean materials, but about developing a test methodology. However, to develop the methodology a wide selection of materials with different surface properties are desired. Therefore, we are looking for both traditional materials as well as new materials stated to be "easy-to-clean". In the present second part of the project, about 10 materials, from "bad" ones to better ones, are included in the methodology development work.