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Wednesday, 18 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Diffusion and drying of polyurethane coatings investigated

Wednesday, 27 June 2012

A presentation at the European Coatings Conference "Polyurethanes for high-performance coatings” will discuss the drying and curing of polyol and isocyanate in water by means of Inverse-Micro-Raman-Spectroscopy. 

Polyurethane coatings are used in many industrial finishing processes

Source: Bayer MaterialScience AG

Polyurethane coatings are used in many industrial finishing processes

Source: Bayer MaterialScience AG

Polyurethane coatings are used in many industrial finishing processes due to their hardness, abrasion-resistance and durability. The coating step is usually followed by solvent removal and curing. To design an industrial polyurethane coating process, the understanding of mass transport and chemical reaction during drying and curing is of significant importance.

In his presentation at the European Coatings Conference "Polyurethanes for high-performance coatings”, Dr Philip Scharfer, Karlsruhe Institute of Technology (KIT), will discuss the drying and  curing of polyol and isocyanate in water by means of Inverse-Micro-Raman-Spectroscopy (IMRS). The IMRS measurement method - developed in Karlsruhe - gives the opportunity to measure the solvent concentration profiles and the local degree of curing during the drying and curing process in situ with a high spatial resolution of 1 - 2 µm within the film. After a detailed explanation of the IMRS measuring technique, the influence of different process conditions (e. g. temperature, air flow rate, composition) on the component distribution and drying/curing properties will be shown and discussed.

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