This study concerns the application of ionic liquids [A, PF₆] and [Py, PF₆] as non-toxic halogen-free flame retardants for textile materials. Ionic liquids were applied to cotton-polyester substrates via the coating process using Polyacrylic acid (PA). The process consists of the deposition of a polymer layer containing different ionic liquids as a flame-retardant agent onto the textile substrate to improve the water repellency of cotton/polyester blend fabrics. The optimal conditions used in the process of the functionalization of textile materials by ionic liquids have been studied using the Design Expert 11 software, with a quadratic model. The vertical combustion test according to ISO 6940: 2004 (F) and thermogravimetric analysis (TGA) on pre-treated fabric and coated fabrics have shown that ionic liquids combined with resins give the blend fabric a flame-retardant property and thermal stability for a percentage of 3% of ionic liquids. The scanning electron microscope (SEM) was used to study the morphology of fabrics. Mechanical properties and hydrophobic properties were also investigated according to ISO 13934-1: 2013 and AATCC 22-2005 standards, respectively.

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