Study on preparation and combustion performance of an inorganic composite polystyrene board
First,inorganic materials such as hemihydrate calcium sulfate with negative calorific value were used as the main addi-tives to prepare a flame retardant slurry.Then a low-density ex-panded polystyrene(EPS)foam was used as the matrix.And negative pressure was adopted to open cavities between EPS beads and promote the absorption of the flame retardant slurry.Afterwards,the insulation performance of the obtained expanded polystyrene composite with inorganic additives(EPSC)was tested using a thermal conductivity tester,while its combustion performance was tested using an oxygen index tester,a calorific value tester,a cone calorimeter,and a single burning item(SBI).According to the above tests,the thermal conductivity of EPSC is 0.041 W/(m2∙K),the calorific value is only 2.91 MJ/kg,and its oxygen index reaches 39.7%.The cone calorimeter test results demonstrate that EPSC does not shrink nor melt during the com-bustion process.And the peak heat release rate,total heat re-leased,peak smoke production rate and total smoke production of EPSC are significantly lower than those of the EPS matrix.The SBI test results show that the fire classification of EPSC reaches A2 level,and the smoke production classification reaches S1 level.The flame retardant mechanism is mainly due to the endo-thermic decomposition reaction of calcium sulfate dihydrate and the inert decomposition products.
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