Study On Flame Retardant And Pyrolysis Kinetics Of Cotton Fabric With Inorganic Particle/Intumescent Flame Retardant

Cotton fabric as one of the most popular natural fabrics, widely used in many industries. As the cotton fiber is flammable, its limit oxygen index is only 18%, and burning faster in case of fire, which limits its application in the field of flame retardant and thermal protection, therefore, Improve the flame retardancy of cotton fabrics attracted extensive research. With the progress of the flame retardant regulations, the traditional methods can not meet the flame retardant requirements of environmental protection legislation, while new methods IFR is popular due to halogen-free, highly efficient, low smoke, low toxicity and other characteristics. However, IFR need volume and the matrix material compatibility is poor. Studies have shown that retardant properties of materials can be improved when the inorganic particles and intumescent flame retardant system mixed use.In the paper, SiO2 and Mg(OH)2 were surface-modified, then separately mixed with the APP/MEL/PER to explore synergies between inorganic particles and the intumescent flame retardant. Limited oxygen index, vertical combustion are used to characterize the flame retardant. Experimental results show that the concentration of the finishing solution has a certain impact on the cotton fabric flame retardant, flame retardant added in an amount 20 % is more appropriate. The study found that with the increase of modified particles and intumescent flame quality ratio of flame retardant cotton fabrics are first increased and then decreased, when the amount of flame retardant is fixed at 20% and change the mass ratio of the inorganic particles and intumescent flame. While the flame-retardant cotton fabrics to achieve the best performance, the mass ratio of the modified SiO2 particles and IFR is 1: 4, the LOI values is 31.5%, the modified Mg(OH)2 particles and IFR is 1: 9, the LOI values is 30.8%. Using scanning electron microscopy(SEM), infrared analysis(FTIR), thermal gravimetric(TG) analysis, micro combustion(MCC) to examine their flame retardant, the results show that the flame retardant cotton fabric began to heat decomposition temperature and the temperature of the maximum rate of thermal degradation are all ahead of time compared to prime cotton fabric, the thermal stability of cotton fabrics is decreases when we use the flame retardants and inorganic particles. Compared with APP/MEL/PER flame retardant system, the char yield at 800 ℃ add on 2.51% and 2.12% when modified SiO2 and Mg(OH)2 compound used with intumescent flame at the optimum ratio. This indicated that the flame retardant mixed with inorganic particles can promote the process of carbon.At last, the non-isothermal method is used to study thermal decomposition characteristics of cotton fabrics treated with mixed flame retardant system. Under a nitrogen atmosphere, the samples were heated from 30 ℃ to 800 ℃, with the heating rate of 5℃/min, 10℃/min, 20℃/min and 40℃/min, explore the thermal degradation kinetic properties with the method of Friedman, Flynn-Wall-Ozawa and Kissinger. Studies have indicated that different methods caused activation energy value retardant cotton fabric is different due to the complex degradation process of cotton fabrics. Comprehensive analysis showed that the activation energy of cotton fabrics which is treated with the modified inorganic particles and intumescent flame retardant is improved and the thermal degradation mechanism has not changed.