A kind of low-dimensional sio2 high-strength light-weight thermal insulation material and preparation method thereof

Abstract

The invention provides a low-dimension SiO2 high-intensity lightweight heat insulation material and a preparation method thereof. The preparation method is characterized in that silicon dioxide micro-powder with granularity of 300-500nm and silicon dioxide micro-powder with granularity of 100-200nm are used as the main raw materials; CaO-MgO-SiO2 refractory fibers are used as the reinforcement materials, and on that basis, the low-dimension SiO2 high-intensity lightweight heat insulation material is prepared; ultrafine inorganic fiber spraying gum is arranged on the material surface; and thenthe material is burnt under low temperature to obtain the lightweight heat insulation material. According to the method, the byproduct, namely, the silicon dioxide micro-powder is used as the main material, and the bio-soluble fibers which are harmless to human body are used as the reinforcement materials, and moreover, the spraying gum is arranged on the surface of a brick blank, so that the intensity of the brick blank is improved; the forming pressure is reduced; the inner voidage of the brick blank is increased; the heat conducting rate of the heat insulation material is decreased; the material is burnt under low temperature, so that he product intensity is improved, and moreover, the micropore structure of the heat insulation material remains; the heat conducting rate in working underhigh temperature is not increased; the heat insulation brick is prevented from absorbing moisture and hydrating. Therefore, the heat insulation performance is further improved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. Specifically related to a low-dimensional SiO 2 High-strength light-weight thermal insulation material and preparation method thereof. [0002] technical background [0003] With the continuous consumption of resources, energy problems are becoming more and more significant, and human beings have higher and higher requirements for energy conservation and environmental protection. As a key material in the high-temperature kiln industry, refractory materials play a decisive role in the energy-saving and emission-reduction of high-temperature industrial industries through their thermal conductivity. Among them, light-weight thermal insulation refractory materials are of great significance as the kiln insulation layer. [0004] At present, the light-weight thermal insulation refractory materials mainly include refractory fiber and calcium silicate board, etc., the thermal conductivity o...

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Problems solved by technology

Based on this principle, the existing thermal insulation materials are concentrated on the development of microporous materials, such as thermal insulation felt insulation materials made of silica airgel and reinforcing fibers, which utilize the nanoporous structure in silica airgel to effectively It is widely used in the field of building materials to reduce the thermal conductivity of the material and enhance its sound insulation effect. However, the silica airgel used in it is a synthetic raw material, the preparation process is complicated, and the production cost is high. It is rarely used in the field of refractory materials; Composite heat insulation material prepared by nanoporous siliceous powder, reinforcing fiber and other additives, which uses the nanoporous structure of siliceous powder to improve the thermal insulation performance of the material, but the use temperature of this material is relatively low, such as usually used at around 600°C , and the thermal conductivity at this temperature is about 0.05W / m·k, which still cannot meet the use in a relatively high environment. At the same time, the nanoporous silicon powder used is actually synthesized bulk porous silica by chemical methods such as sol-gel. be made of

Therefore, in the field of refractory materials, the insulation materials made of silica airgel, nanoporous siliceous materials and fibers have the problems of complicated preparation process and high production cost. The thermal conductivity of pipes is still high when used, which cannot fully meet the needs of energy saving and emission reduction

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