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Monday, 23 September 2019
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Raw materials & technologies, Technologies, UV/EB Coatings

Enhancing water repellence stability in fluoroacrylate photopolymers

Friday, 20 June 2014

Fluoropolymers have attracted a lot of attention in the past 20 years mainly due to their hydrophobic properties.

Thermal annealing is necessary for fluoracrylate coatings Source: Heraeus

Thermal annealing is necessary for fluoracrylate coatings Source: Heraeus

Unfortunately, they have also shown some stability issues mainly in hot water due to the easy disorganisation of the fluorine chains. In a paper Confocal Raman Microscopy (CRM) has been used as an indirect probe to optimise the fluoroacrylate content in an acrylic photocurable resin in order to reduce the effect of hot water. Advancing and receding contact angles have also been measured to characterise the surface repellence both before and after immersion in hot water.

Resistance toward hot water immersion was increased

Results show that despite an improvement of the stability of the fluoroacrylate coating with a careful selection of the concentration range, water still has a negative effect on the surface properties of the coating. This effect can be partly counterbalanced by successive thermal annealings at 100°C which help to stabilise the hydrophobicity of the coating.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 6, June 2014, Pages 1030-1036.

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