Bio-based interior wall intumescent fireproof coating and preparation method thereof

The invention provides a bio-based interior wall intumescent fireproof coating. The bio-based interior wall intumescent fireproof coating is prepared from the following raw materials in parts by weight: 20-50 parts of a bio-based intumescent flame retardant, 10-30 parts of bio-based filler, 8-15 parts of pigment, 20-50 parts of resin, 0.1-1 part of an antibacterial agent, 0.5-1.8 parts of a coalescing agent, 0.5-1.5 parts of an anti-freezing and thawing aid, 0.6-1.2 parts of a dispersing agent and 0.1-0.3 part of a defoaming agent. Renewable substances such as biological substances and biological extracts are used as raw materials, so that the use of non-renewable resources is reduced, the carbon emission is reduced, the pollution of chemical production is reduced, and the environment is protected. Compared with the existing common intumescent fire retardant coating, the intumescent fire retardant coating has good hydrophobicity and storage stability. The coating disclosed by the invention can be used for civ