Method for preparing brucite fiber reinforced SiO2 aerogel heat-insulating material

Abstract

The invention discloses a preparation method for brucite fiber reinforcement SiO2 aerogel heat insulating material. Wherein, with industrial water glass or silicasol and natural brucite staple fiber as material, using high-energy ball grinding and chemical dispersion method to realize size refining for inorganic opacifier and even distribution before sol solidification; splitting the natural brucite staple fiber into nano diameter with chemical dispesion method as reinforcing material. This invention overcomes the volume shrinkage problem by substituting solvent and hydrophobisation treatment and fiber reinforcement. The materila has density as 0.20~0.50g / cm3 and thermal conductivity factor as 0.010~0.030w / m*k.

Description

technical field

[0001] The invention relates to a preparation method of an inorganic non-metal matrix composite material, in particular to a natural brucite fiber-reinforced SiO 2 A preparation method of an inorganic airgel heat insulating material. Background technique

[0002] Compared with traditional inorganic heat insulation materials, inorganic airgel is a new type of super heat insulation material, which is a kind of light-weight material composed of inorganic colloidal particles agglomerated with each other to form a nanoporous network structure, and the pores are filled with gaseous dispersion medium. Amorphous solid material has the characteristics of low density, large specific surface area, high porosity, small pore size and narrow distribution. Since the heat conduction and heat convection of thermal insulation materials are related to the structural scale of the material, when the pore and structural scale in the material reach the nanometer level, especially ...