Study on Preparation and Flame retardancy of WF/PP Composites Synergistically Modified with Composite Flame Retardants
Wood-plastic composite(WPC)is a kind of renewable building material,but its poor flame retardancy limits its safe use.In order to improve the flame retardancy of WPC composites,the compound flame retardant composed of modified ammonium polyphosphate(M-APP)and expanded graphite(EG)was added into the WPC matrix to prepare WPC composites.The mechanical properties,flame retardancy and thermal stability of WPC composites were tested.Compared with unmodified WPC,when the ratio of M-APP to EG is 1:1,the LOI value of WPC/A1/E1 increases by 44.4%,the peak heat release rate decreases by 80.1%,and the total smoke production decreases by 91.6%.The tensile strength of WPC/A1/E1 is 25.1 MPa,which is 3.7%higher than that of unmodified WPC.The flexural strength of WPC/A1/E1 is 45.1 MPa,which is 1.1%higher than that of unmodified WPC.The carbon residue of WPC/A1/E1 is 27.5%,which increases by 76.3%compared with unmodified WPC.When the ratio of M-APP to EG is 1:1,WPC/A1/E1 has better comprehensive properties.
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