Nano silica dioxide heat-insulating material and preparation method thereof

Abstract

The invention relates to a nano silica dioxide heat-insulating material and a preparation method thereof, wherein the preparation method of the nano silica dioxide heat-insulating material comprises the steps of putting 60-100 wt% of nano silica dioxide powder, 0-35 wt% of reinforced fibre and 0-30 wt% of infrared opacifier in an enclosed stirrer after being mixed; and stirring at high speed by adopting a dry method to enable the mixture in the enclosed mixer to be dispersed evenly to prepare an unshaped heat-insulating material or a stereotyped heat-insulating material by mould pressing. By adopting the nano silica dioxide heat-insulating material is prepared by the preparation method of nano ilica dioxide heat insulating material, the un-shaped or stereotyped heat insulating material with excellent heat-insulating property can be prepared by uniformly mixing the nano silica dioxide powder, the reinforced fibre and the infrared opacifier in a proper proportion. The nano silica dioxide heat-insulating material has the advantages of simple preparation technology, easy operation, low preparation cost, wide application area and environment-friendliness.

Description

technical field [0001] The invention relates to a silicon dioxide thermal insulation material and a preparation method thereof, in particular to a nanometer silicon dioxide thermal insulation material and a preparation method thereof, and belongs to the technical field of inorganic non-metallic material manufacture. Background technique [0002] Silica airgel is a new type of lightweight nanoporous material, which has the advantages of low density, large surface area and high porosity, especially has extremely low thermal conductivity and good thermal insulation performance, so it can be used as a material with excellent thermal insulation performance. It is a super heat insulating material, but because of its brittleness and low strength, it cannot be used in engineering practice as a heat insulating material, thus limiting its popularization and use. [0003] At present, in some European and American countries, silica airgel powder or particles are generally placed between...

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Problems solved by technology

[0002] Silica airgel is a new type of lightweight nanoporous material, which has the advantages of low density, large surface area and high porosity, especially has extremely low thermal conductivity and good thermal insulation performance, so it can be used as a material with excellent thermal insulation performance. Super thermal insulation material, but due to its brittleness and low strength, it cannot be used in engineering practice as a thermal insulation material, thus limiting its popularization and use

Due to the complex preparation process and high cost of this material, most of it is only used for special equipment or projects with special requirements, which limits its popularization and use.

In addition, some existing preparation methods can avoid the complex process of supercritical drying technology, but after adding the prepared powder into the prepared sol, it needs to go through gel aging at 40-100°C for 12-24 hours and negative drying. Pressure drying process, cumbersome process, many organic components, use in high temperature environment will inevitably cause organic volatiles, poor environmental friendliness

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