A kind of nano silicon dioxide particle packed bed super thermal insulation material and preparation method thereof

Abstract

The invention discloses a nano-silica particle packed bed super thermal insulation material and a preparation method thereof. The method comprises the steps as follows: nano-silica particles A with the particle size of 10-40 nm and nano-silica particles B with the particle size of 50-100 nm are placed in a ball mill in the mass ratio being (5:5)-(8:2) at the room temperature, nano-silica mixed particles A are obtained after uniform mixing and then transferred to an ultrasonic dispersion machine, an infrared shielding agent is added to the ultrasonic dispersion machine for ultrasonic dispersionfor 50-70 min, and nano-silica mixed particles B are obtained, wherein the mass ratio of the infrared shielding agent to the nano-silica mixed particles A is (1:10)-(1:4); the nano-silica mixed particles B are pressed at the room temperature and the nano-silica particle packed bed super thermal insulation material is obtained. The production process can be simplified, the production cost can be reduced and the environmental pollution can be reduced on the basis that the prepared material has high-temperature resistance and excellent mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and specifically relates to a silicon dioxide thermal insulation material and a preparation method thereof, in particular to a nano-silica particle stacked bed super thermal insulation material and a preparation method thereof. Background technique [0002] Nanoporous super thermal insulation material refers to the thermal insulation material whose thermal conductivity is lower than that of "no convection air". Thermal insulation materials can be widely used in aerospace, national defense, chemical industry, metallurgy, electric power, construction and other fields. [0003] At present, nanoporous super thermal insulation materials are roughly divided into the following categories: nano-xonotlite, calcium silicate-based composite materials, nanofiber thermal insulation materials and silica airgel composite materials, among which silica airgel is The most widely studied t...

AI Technical Summary

Problems solved by technology

In this invention, the high temperature resistance and mechanical properties of silica airgel are improved by adding infrared opacifying agent and reinforcing fiber to silica airgel. Although the processing technology is simple, the added reinforcing fiber increases The cost of the material is reduced, and the mechanical properties of the prepared thermal insulation material are not significantly improved