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Saturday, 21 September 2019
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Raw materials & technologies, Raw materials, Coatings additives

Balancing product performance and ecotoxicological impact

Monday, 5 November 2012

A new class of fluorosurfactant can achieve high packing densities and so a relatively low surface tension, combined with a rapid dynamic surface tension reduction.

A new class of fluorosurfactant has been developed

Source: Alexander Raths/ Fotolia

A new class of fluorosurfactant has been developed

Source: Alexander Raths/ Fotolia

Fluorosurfactants are able to reduce the surface tension of aqueous formulations to values lower than can be achieved with other products. However, concern over the environmental effects of long-chain (C8) fluorosurfactants has led to a ban on their use. Shorter-chain types are less bio-accumulative but in general cannot achieve such low surface tension values as the longer-chain products.
A new class of fluorosurfactant has been developed based on a very short C2 chain but with a branched structure. It is shown that this product can achieve high packing densities and so a relatively low surface tension, combined with a very rapid dynamic surface tension reduction.
Combining this with a C6 fluorosurfactant leads to a synergistic combination with very fast surface tension reduction and low final values. A paper in the November issue of the EUROPEAN COATINGS JOURNAL presents results to show that this is very effective in reducing cratering defects and foam generation.

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