Low-smoke carbon-forming type flame retardant and application thereof in preparation of flame-retardant polyurethane elastomer

The invention belongs to the technical field of flame-retardant polyurethane elastomer materials, and provides a low-smoke carbon-forming type flame retardant and application thereof in preparation ofa flame-retardant polyurethane elastomer in order to solve the problem that a phosphorus, nitrogen and carbon synergistic flame-retardant polyurethane elastomer is lacked at present. The low-smoke composite flame-retardant polyurethane elastomer is prepared by adjusting the carbon content and the oxygen content of a polyurethane system through a flame retardant synthesized from phosphoric acid, melamine, urea and bisphenol A epoxy resin E-12, and the combustion performance of the low-smoke composite flame-retardant polyurethane elastomer meets the ISO340-2004 flame-retardant standard. Harm tothe human body and the environment caused by combustion is reduced; No corrosive gas is released, and no adverse effect is caused to the environment and surrounding equipment; the low-smoke carbon-forming type flame retardant