Application and mechanism of hydrotalcite flame retardant agent

The hydrotalcite-PU flame retardant agent was prepared by compound hydrotalcite into waterborne PU,and then applied on polyester fabrics.The mechanism of flame retardant and moisture permeability were studied by characterizing hydrotalcite structures by X-ray diffraction(XRD) and infrared spectroscopy(FT-IR),and the coated fabric by thermogravimetry(TG) and scanning electron microscopy(SEM).The results show that the combustion of coated fabric is retarded because hydrotalcite plays a multi-role of endothermic cooling,then diluting gas phase,and finally forming heat insulation layer on the fabric surface during the burning process.The moisture permeability is improved resulted from the hydrophilic group in hydrotalcite.