Functional Textile Coating
Surface treatments consisting of a carbon chain with fluorinated side groups provide high levels of water and oil repellency to technical and performance fabrics. These side chain fluorinated polymers work by lowering the surface energy of the textile to a point where liquids cannot wet the fibres. They are commonly applied in the final finishing stage of production through a pad and dry process.
Chemical Structure
The effectiveness of the repellent finish is determined by the length of the fluorinated groups attached to the polymer backbone. Historically, long chains containing eight carbons were used, but these have been largely replaced by shorter chains to comply with environmental regulations. Even with shorter chains, side chain fluorinated polymers remain the most effective way to provide durable oil resistance to synthetic materials.
These shorter six carbon versions offer a lower environmental profile while maintaining a high level of liquid bead formation on the fabric surface.
Application Process
Mills apply the polymer emulsion to the fabric using a specialized dipping and squeezing method. High temperatures are required in the stenter frame to cure the resin and ensure that the side chain fluorinated polymers are properly oriented on the fibre surface. This orientation is what creates the protective barrier against stains and moisture.
Regulatory Compliance
Monitoring the presence of residual monomers and restricted byproducts is a mandatory part of the quality control process for these finishes. Brands require testing to ensure that the concentration of restricted substances stays below the limits set by global environmental standards. Using side chain fluorinated polymers involves a trade off between high performance protection and the need for sustainable chemistry in the fashion industry.
