Abstract
This paper was aimed to evaluate process of APP/SiO2, which used Nano-crystalline cellulose (NCC) modified ammonium polyphosphate (APP) as anionic polyelectrolyte (a-APP), and cationic polyethyleneimine (PEI) modified Nano–SiO2as cationic polyelectrolyte (c-SiO2). The flame retardant system was built due to the reaction of a-APP and c-SiO2. Polyelectrolyte composite of a-APP/c-SiO2were then assembled on the surface of wood powder and HDPE composites. The effect of polyelectrolytes on wood-plastic composites (WPC) were investigated and the results showed that the flame-retardant property of WPC treated by polyelectrolyte was the best. The average heat release rate was 152.8kW/m2, the peak heat release rate was 352.2kW/m2, the total heat release was 108.5kW/m2, the limit oxygen index reached the maximum was 27.5%, compared with the WPC treated by APP, the elongation at break increased by 60.4%. After anionic and cationic polyelectrolyte treatment, making anionized a-APP and cationized c-SiO2due to the charge interaction, in the WPC combustion process to form a dense, uniform WPC carbon layer, thereby reducing the heat transfer to the material inside, and increasing the flame retardancy of WPC composites.
Highlights
Wood-plastic composite (WPC) was a new type of general-purpose composite material composed of renewable and inexpensive wood fiber or wood powder and resin polymer
The c-SiO2 were uniformly dispersed on the surface of the wood powder, which can effectively prevent the ammonium polyphosphate (APP) migration phenomenon as the using time prolongs
When the a-APP/c-SiO2 was added to WPC, which total smoke release (TSR) and total heat release (THR) were the lowest decreased to 1694.7m2/m2, 108.5 MJ/m2, compared with WPC/APP decreased by 13.9% and 8.8%, respectively
Summary
Wood-plastic composite (WPC) was a new type of general-purpose composite material composed of renewable and inexpensive wood fiber or wood powder and resin polymer. WPC was widely used in outdoor decking, building materials, ship materials and automotive materials due to their excellent corrosion and water resistance, and recyclability [1,2,3]. With the application of WPC gradually expanding into the field of interior decoration, researches on flame retardant properties of WPC became increasingly important. By directly interfered with the combustion process and adjusted the conditions and processes, the flame retardant properties of the material can be effectively regulated [9, 10].
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