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29. Dec 2020 | Coatings Technologies

Development of fluorine-free anti-stain textile finishing agents

Partially biobased, VOC-free polymer coatings confer water-repellence and acceptable oil-repellence to fatty triglycerides.
Only the textiles coated with the (co)polymethacrylates with higher M3T contents showed good repellence to olive oil
Image source: OpenClipart-Vectors - Pixabay (symbol image).

Fabric functionalisation to obtain omniphobic textiles is an increasing trend due to science and technology push in our current society. Fluorochemicals dominate the water and oil-repellent textile finishing market because of their excellent performance. However, fluorinated chemicals release harmful substances. In a new paper, a series of fluorine-free, low surface energy and partially bio-based (co)polymethacrylates based on 3-[Tris(trimethylsilyloxy)silyl]propyl methacrylate (M3T) and stearyl methacrylate (SMA) have been successfully synthesised and characterised. Moreover, the particle size, particle size distribution and stability of developed emulsions have been assessed.

The fluorine-free M3T/SMA (co)polymethacrylates have been applied on cotton fabrics by padding at several product dosages and coated textiles have been characterised by scanning electron microscopy (SEM), EDS element mapping, X ray fluorescence (XRF) and water and olive oil static contact angle measurements, WCA and OCA, respectively.

High static water contact angles

Finally, the performance of the fabrics treated with the new M3T/SMA (co)polymethacrylates has been evaluated and compared with textiles finished with conventional fluorinated chemicals. All the synthetised (co)polymethacrylates provide the coated substrates with high static water contact angles as well as excellent solvent-water separation efficiencies. However, only the textiles coated with the (co)polymethacrylates with higher M3T contents showed good repellence to olive oil, being able to keep the drop of oil on the surface for longer times. This time-dependent olive oil’s wettability observed for the copolymers with low contents on M3T units may be ascribed to: i) the evolution with time of the surface free energy of the coatings due to a reorientation over time of stearyl side chains of SMA during contact with the olive oil; and ii) the reduced barrier properties of the coatings with lower content of the bulky tris(trimethylsilyloxy)silyl side chains.

The study has been published in Progress in Organic Coatings, Volume 150, January 2021.

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