Nano-porous thermal insulating material and method for producing the same

Abstract

The invention discloses a heat insulation material with nanometer pores and a manufacturing method thereof; the heat insulation material with nanometer pores is prepared from the following components: silica of nanometer level, silicon source sol, inorganic reinforced fiber, structural strengthening agent, surface modifier, sunscreen, catalyst and diluents. The heat insulation material with nanometer pores prepared by the invention can be easily shaped, with small bulk density, small thermal conductivity, high utilization temperature, non-combustible performance, and certain mechanical strength; the interspace of the nanometer pores is over 80 percent, and the bulk density is from 150 to 250kg / m<3>; the thermal conductivity under room temperature is less than 0.025W / m.k, and the average thermal conductivity under 500 DEG C is no more than 0.050W / m.k, with the highest utilization temperature 950 DEG C; the invention is suitable for heat insulation in boats, industrial pipes and heating furnaces.

Description

technical field [0001] The invention belongs to the field of inorganic heat-insulating materials, and in particular relates to a preparation method of a heat-insulating material with a nanopore structure. technical background [0002] Currently commonly used inorganic thermal insulation materials such as fibrous materials such as asbestos, glass wool, rock wool, aluminum silicate fibers, and foam materials such as expanded perlite, foam glass, and microporous calcium silicate have been widely used. However, their heat insulation effect is not good under high temperature conditions (such as above 500°C), because the void scale in the material is relatively large, which cannot effectively prevent convective heat transfer in heat transfer. If the size range of the voids in the internal structure of a material and the particles of the national phase part is 100nm or below, it can effectively limit the heat convection and heat conduction of the material, so that good thermal insu...

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Problems solved by technology

The disadvantage of this method is that 4-6 times of solvent cleaning will bring great trouble to the preparation of the product. In addition, the production cycle is long and the solvent consumption is large, which also brings difficulties to the preparation of the material.

[0007] Although the materials prepared by the above invention patents have good thermal insulation properties, the preparation conditions are harsh, which causes great inconvenience to the actual operation.