Method for preparing hydrophobic block cellulose aerogel thermal insulation material

The invention discloses a method for preparing a hydrophobic block cellulose aerogel thermal insulation material, wherein cellulose is taken as a raw material to prepare cellulose aerogel and aerogel. The method comprises the steps of cellulose solvent preparation, aerogel preparation, drying and hydrophobic modification. The porosity of the thermal insulation material is 71.4-84.88%, while the density thereof is 0.23-0.37 g/cm and the compressive strength thereof is 5.7-8.2*10 kPa. The material prepared by the method is green and environment-friendly and has the characteristics of high porosity, strong mechanical property, low heat conductivity coefficient and the like. The material provided by the invention is stable in material property in the range of -100 to 80 DEG C and the lowest heat conductivity coefficient of the material is 0.029 W/(m.K). Furthermore, the material has excellent thermal insulation property and is wide in application prospect in civil industry and low/medium temperature thermal protection field having special requirements, and simultaneously, provides a basis for the application of the polysaccharide aerogel material in the thermal insulation field.