Temperature control type microcapsule flame retardant for tunnel asphalt pavement and preparation method of temperature control type microcapsule flame retardant

The invention discloses a temperature control type microcapsule flame retardant for a tunnel asphalt pavement and a preparation method of the temperature control type microcapsule flame retardant. The flame retardant is composed of a capsule core, a separated capsule wall (chlorinated paraffin) and a temperature control protection type capsule wall (ethyl cellulose), the capsule core comprises an initial capsule core (zinc borate, aluminum hydroxide and montmorillonite) and an external capsule core (aluminum-based polyvinyl alcohol chitosan composite aerogel); the initial capsule core is wrapped in the separated capsule wall, and the external capsule core is wrapped between the separated capsule wall and the temperature control protection capsule wall. Heating and melting chlorinated paraffin, and preparing an initial microcapsule through a fluidized bed process; and grinding the external capsule core, mixing with the initial microcapsule, mixing with the molten ethyl cellulose, quickly condensing to a solid