Water-repellent and more: coating textiles sustainably with chitosan
Textiles can be coated with the biopolymer chitosan and thus made water-repellent by binding hydrophobic molecules. The good thing is that this can also replace toxic and petroleum-based substances that are currently used for textile finishing. In the last few years Fraunhofer IGB and partners have developed technology to provide fibers with the desired properties using biotechnological processes and chitosan.
https://www.biooekonomie-bw.de/en/articles/pm/Water-repellent-and-more-coating-textiles-sustainably-with-chitosan