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New flame retarded fillers for polyurethane textile coating

von Dr. Stéphane Giraud, Dr. Maryline Rochery, Dr. Isabelle Vroman, Prof. Eric Devaux, Prof. Serge Bourbigot

Polyurethane resins are widely used as coating for textile fabrics in order to improve some properties (mechanical behavior, water repellency, air impermeability…). The aim of this study is to synthesise PU coatings which can provide good flame retardancy for the coated textile fabric. Three kinds of additives have been added to provide FR PU:

- montmorillonite clay,

- an organic-inorganic hybrid material, the Polyhedral Oligomeric Silsesquioxanes (POSS),

- microcapsules of Di-Ammonium Hydrogen Phosphate (DAHP).

Different fillers have been tested and the resultant coated polyester or cotton fabrics have been examined using thermogravimetric analysis and the cone calorimeter as fire model. The efficiency of the PU coatings are clearly demonstrated and discussed in comparison with virgin material. These results confirm therefore a promising way for flame retarding textile.