Ultrathin thermal insulation material with high-temperature resistance and low heat conductivity and preparation technology of thermal insulation material

The invention provides an ultrathin thermal insulation material with high-temperature resistance and low heat conductivity and a preparation technology of the thermal insulation material, and belongsto the technical fields of the thermal insulation material. The technical problems that a heat insulation material between batteries of an existing new-energy automobile is unqualified and the like are solved. The ultrathin thermal insulation material with high-temperature resistance and low heat conductivity comprises polycrystalline mullite fiber paper and silica micropowder coating inside of the polycrystalline mullite fiber paper, the diameter range of particles in the silica micropowder is 7 nm-12 nm, and the volume ratio of the silica micropowder to internal fiber in the polycrystallinemullite fiber paper is 50:50. The preparation technology of the ultrathin thermal insulation material with high-temperature resistance and low heat conductivity comprises following steps: A, stirring;B, mixing; C, pre-dewateri