Water and oil-repellent coatings of perfluoro-polyacrylate resins on cotton fibers: UV curing in comparison with thermal polymerization

Comparative Enactment of Fluorocarbon-free and Fluorocarbon-based Water Repellent Finishes on Cotton Single Jersey Fabrics

“…This repellency can be achieved by implementing a thin surface layer of water repellent chemicals on textile fibres by the modification of surface energy of textiles with minimal effects on other functional properties like strength, flexibility, breathability, softness etc. (Bongiovanni R 2011 andFerrero E 2012). Polymeric coating on cotton fabric must secure good homogeneity with preferred properties without deteriorating fabric's comfort ability like handle, breathability etc.…”

Water and Oil Repellent Finishing of Textiles by UV Curing: Evaluation of the Influence of Scaled-Up Process Parameters

“…It is worth to noting that, by UV irradiation in air rather than in nitrogen, the radical reactions are slackened by oxygen interference, hence a higher photoinitiator concentration is needed to speed up the initiation step. In fact, in the previous laboratory experiments of irradiation in inert atmosphere a 2 wt % photoinitiator concentration on finishing agent was enough to achieve satisfactory grafting yields [2].…”

“…Fluorochemical finishings are commercially available as water emulsions and are applied to fabrics by the pad-dry-cure method, with a thermal curing step at 150-175 °C in a hot flue for some minutes [17][18][19][20]. As an alternative, the UV grafting of perfluoro-alkyl-polyacrylate resins as Oleophobol CP-C has been tested on cotton fabrics in a previous laboratory work, where the effectiveness of this approach has been compared with that obtained by thermal polymerization [2]. Yields after UV curing are quite similar, while strong water and oil repellency conferred by photografting was confirmed by static and dynamic contact angle measurements.…”

“…These properties can be conferred by the modification of the surface energy of textile fibers, possibly confined to a thin surface layer, so that the bulk properties of the fabric, such as mechanical strength, flexibility, breathability, and softness remain uncompromised [1,2].…”

Modification of Surface Energy and Wetting of Textile Fibers

“…On the other hand, Ferrero et al [88] extended the study of the UV-curing method to the use of perfluoro-alkyl-polyacrylate resins that are able to impart water as well as oil repellency to cotton fabrics, and the results obtained by UV curing were compared with those obtained by conventional thermal polymerization. This study was focused on the use of commercial finishes for thermal application, Repellan EPF and NFC, by Pulcra Chemicals, and Oleophobol CP-C, by Huntsman, supplied in water emulsions (about 17% solid content, dispersible in cold water in all ratios).…”