Research And Development Of Flame-Retardant Anti-Dripping Polyester Fabric Based On H-PA-PVA

Due to the flammability of polyester fabrics,a large number of molten droplets are generated during combustion,which is easy to cause secondary fires,which limits its application in special fields such as fire protection and protection.Therefore,the development of polyester fabrics with flame retardant and anti-dissolving droplets has great practical significance.Many researchers have used synthetic organic phosphate flame retardants for the flame retardant modification of polyester fabrics,but the extraction process of phosphate esters synthesized in organic solvent systems is complicated,has many impurities,and has low yields.Deionized water has the advantages of low boiling point,low polarity,natural environmental protection,etc.However,there are few reports on the synthesis of phosphate flame retardants in aqueous solvents.In this paper,polyvinyl alcohol(PVA)and a natural organic phosphoric acid compound(PA),an environmentally friendly,non-toxic and high phosphorus content extracted from plants are selected as raw materials Organophosphate flame retardants PA-PVA and H-PA-PVA were synthesized in two solvent systems of pyrrolidone(NMP)and deionized water,and their properties were characterized.The H-PA-PVA is formulated into a flame retardant finishing liquid,and the dip coating process is used to perform flame retardant anti-melt drop finishing on the polyester fabric to achieve flame retardant and anti-melt drop modification of the polyester fabric.The specific research results are as followsThe results of Fourier infrared spectroscopy showed that phytic acid(PA)and polyvinyl alcohol(PVA)were used as raw materials to synthesize organic phosphate flame retardants PA-PVA and H-PA-in NMP solvent system and aqueous solvent system,respectively.PVA,and H-PA-PVA has fewer impurities than PA-PVA.Thermogravimetric analysis showed that the residual rate of PA-PVA above 500?was 10.9%,and that of H-PA-PVA above 500? was 35.7%.Through microcalorimeter test analysis,it is found that the peak heat release rate of PA-PVA is 134.8W/g,the heat release capacity is 161J/g·K,the total heat release amount is 15.7KJ/g,the heat of H-PA-PVA The peak release rate is 93.7W/g,the heat release capacity is 97J/g·K,and the total heat release amount is only 7.7KJ/g,indicating that the heat release intensity of H-PA-PVA is weaker than that of PA-PVA.The risk is less.The limit oxygen index(LOI)test results show that the LOI of PA-PVA is 35.8%,and the LOI of H-PA-PVA is 48.1%,indicating that the flame retardant effect of H-PA-PVA is more excellent than PA-PVA.H-PA-PVA is formulated into a flame-retardant finishing liquid solution for the flame-retardant and anti-melt drop modification of polyester fabrics,and the amount of H-PA-PVA added is indicated by the fabric weight gain rate.Vertical burning test results show that when the fabric weight gain rate is 6%,there is no melting dripping during the burning process of the polyester fabric.The residual carbon rate of polyester fabrics above 500? increases with the increase of the amount of H-PA-PVA,and the heat release strength gradually decreases with the increase of the amount of H-PA-PVA.When the fabric weight gain rate is 40%,the burning residual carbon rate is 31.3%,which is 79.9%higher than the polyester fabric as it is;the peak heat release rate is 197.0W/g,which is 52.5%lower than the original fabric It is 213J/g·K,which is a decrease of 54.3%compared with the original fabric;the total heat release is 12.2KJ/g,which is a decrease of 34.8%compared with the original fabric.And when the fabric weight gain rate is 40%,its limiting oxygen index(LOI)is 29.0%,which is 51%higher than the polyester fabric,indicating that its flame retardant performance has been improved.