The effects of seven transition metal oxides (MOs),including ZnO,CuO,CeO2,La2O3,ZrO2,Fe2O3 and Al2O3,on the flame retardancy,thermal stability and mechanical properties of silicone rubber composites were investigated by limited oxygen index (LOI),vertical combustion instrument,simultaneous thermal analyzer,cone calorimeter and electronic universal testing machine.The results indicated that MOs could enhance the LOI values of silicone rubber composites,of which the effect of ZnO is most significant,and the LOI value of silicone rubber composites increased from 24.4 to 27.2 with adding 5 phr ZnO.The vertical combustion level of the silicone rubber composite material remained non-classified with the loading of MOs,indicating that the effect of MOs on improving vertical combustion performance was not significant.CuO and La2O3 could reduce the maximum thermal decomposition temperature of the composite material,while the addition of ZnO could improve the initial thermal decomposition temperature,maximum thermal decomposition temperature and the residual carbon,in which the initial thermal decomposition temperature and residual carbon at 800℃ of the composite containing 5 phr of ZnO reached 446.9℃,646.7℃ and 31.8%,respectively.MOs could improve the fire safety of the silicone rubber composites,and the peak heat release rate (PHRR) and total smoke production (TSP) of the composites with 5 phr of ZnO decreased by 35.8% and 23.4%,respectively.Except for La2O3,which reduced the mechanical properties of the composites,the addition of ZnO and CuO increased the tensile strength and elongation at break of the composites.
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基金资助
天津市自然科学基金项目(22JCYBJC01720),应急管理部天津消防研究所基科费项目(2023SJ18)
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