Study on the Combustion Performance of Layer-by-Layer Self-assembled P-N-Si Flame Retardant on Epoxy Resin

Epoxy resin (EP) has become a very important thermosetting resin material due to its excellent mechanical and chemical properties. However, the flammability of EP limits its wider application. Therefore, in this paper, layer-by-layer self-assembly technology is used to coat polyethyleneimine (PEI) and ammonium polyphosphate (APP) on the surface of bagasse (BF) layer by layer to prepare layer-by-layer self-assembly modified bagasse (nBL@BF).Where nBL represents the number of PEI/APP double-layer coatings, in this article n is 3, 6 or 9), and on this basis, the surface of 9BL@BF is modified with silane coupling agent KH550 to form P-N-Si ternary flame-retardant system to further improve its flame-retardant efficiency. Studies have shown that nBL@BF can improve the thermal stability and flame retardancy of EP to a certain extent (the highest LOI is 26.8%), while the LOI of 9BL@BF-KH550 reaches the highest value (31.2%) after adding EP. This strategy not only provides a new method for flame-retardant epoxy resin, but also greatly expands the comprehensive utilization of bagasse.