The invention relates to a
biomass flame retardant, a water-based
flame-retardant
coating as well as a preparation method and application of the water-based
flame-retardant
coating, and belongs to the technical field of flame-retardant materials. In order to solve the problems that an existing bio-based flame retardant is low in efficiency and cannot meet the use requirement of a flame-retardant
coating, the invention provides a
biomass flame retardant which mainly comprises
chitosan,
melamine formaldehyde resin coated
ammonium polyphosphate and a flame-retardant synergist, the weight ratio of the
chitosan to the
melamine formaldehyde resin coated
ammonium polyphosphate is 1: 1-1: 6, and the weight of the flame retardant synergist accounts for 4-8% of the total weight of the
biomass flame retardant. According to the biomass flame retardant, the MFAPP, the
chitosan and the flame retardant synergist are compounded to obtain the flame retardant with the expansion property integrating a
carbon source, an acid source and a gas source, and the biomass flame retardant has the advantages of being small in addition amount, efficient, low in
toxicity and the like. The water-based flame retardant coating is prepared by adding the water-based flame retardant into water-based
epoxy resin, the coating is applied to wood flame retardance, the flame retardant coating expands rapidly after meeting fire, and efficient flame retardance can be achieved.