Development of renewable soil release coatings for heat-insulating facade materials based on interpenetrating polymer networks
IGF 16887 N
Heat-insulating materials for facades are being used to an increasing extent due to current energy and environmental policy. However, because of low thermal conductivity of these facade materials facade surface heats up quickly at high outside temperatures respectively cools down quickly at low outside temperatures. This results in increased adhesion of many soils (e.g. due to gumming at high temperatures) and increased microbial growth (increased condensation due to rapid cooling below dew point). Removal of such adherent soils by using currently available cleaning methods is connected to high personnel and operating costs.
Therefore, the wfk – Cleaning Technology Institute has developed a new cleaning procedure based on interpenetrating polymer networks (IPNs) as renewable soil-release coatings. The developed IPNs can be applied onto facades as dispersions in uncrosslinked state e.g. by spraying. Subsequent to application, crosslinking is induced by sunlight and adding a saline solution. An invisible coating with high mechanical, thermal and weather stability is achieved, which protects heat-insulating facades against various types of soil. Under cleaning conditions crosslinking density of IPNs is reduced by application of the cleaning solution. Consequently, IPNs can easily be peeled off together with adhering soil e.g. by means of low-pressure water jets or mechanical treatment.
The new cleaning procedure based on IPNs provides cleaning companies with an effective and economical method for removal of strongly adherent soil from heat insulating facade materials.
The IGF-project 16887 N of the research association Europäische Forschungsgemeinschaft Reinigungs- und Hygienetechnologie e.V., Campus Fichtenhain 11, D-47807 Krefeld, was supported via the AiF within the funding programme „Industrielle Gemeinschaftsforschung und –entwicklung (IGF)“ by the Federal Ministry of Economic Affairs and Energy (BMWi) due to a decision of the German Parliament.
The research report is available on request from FRT.