Preparation method of silicon dioxide aerogel thermal insulation material by normal-pressure microwave plasma method

Abstract

The invention provides a preparation method of a silicon dioxide aerogel thermal insulation material by a normal-pressure microwave plasma method. The preparation method comprises the following steps:1, preparing precursor reaction slurry; 2, spraying the precursor reaction slurry obtained in the step 1 onto the surface of a flexible porous material matrix; 3, standing and aging the flexible porous material matrix obtained in the step 2; 4, carrying out plasma microwave drying on the flexible porous material matrix subjected to standing and aging in the step 3; 5, cooling the flexible porousmaterial matrix subjected to plasma microwave drying treatment in the step 4 to room temperature under a normal pressure condition; and 6, preparing a single-layer aerogel finished product / multi-layeraerogel finished product from the single-layer aerogel flexible porous material matrix prepared after normal-pressure cooling in the step 5. The method has the beneficial effects that the produced silicon dioxide aerogel finished product has the characteristics of low density, low heat conductivity coefficient, high specific surface area and good heat preservation and cold insulation effects.

Description

technical field [0001] The invention relates to the technical field of airgel thermal insulation and cold insulation materials, and more specifically relates to a preparation method of silica airgel thermal insulation material by atmospheric pressure microwave plasma method. Background technique [0002] As a representative material in the field of thermal insulation and cold insulation technology, airgel materials have gradually attracted the favor of many fields such as military, aerospace, chemical industry, energy saving, and new energy. Since the surface of the airgel material matrix has a good three-dimensional network pore structure, heat flow can only be transmitted along the pore wall when it is in contact with an external heat source. Its unique high specific surface area and high porosity The high-efficiency structure makes the heat conduction effect of the material matrix most effectively suppressed, and the heat conduction ability of the surface of the airgel ma...

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Problems solved by technology

Due to the relatively high energy consumption, complicated procedures, expensive equipment and many factors that may lead to safety accidents in the supercritical drying process, the production cost of silica airgel is greatly increased, and the risk factor in the production process is increased. , thus limiting the large-scale production and promotion of silica airgel products

[0004] With the deepening awareness of energy conservation and emission reduction and the gradual increase of the Chinese government's prevention and supervision of safety production, the traditional supercritical drying process has been unable to meet the actual needs of the market and production units. It will cause certain damage to the airgel material matrix itself, and even lead to the overall collapse of the structure in severe cases, destroying the perfect three-dimensional network structure on the surface of the matrix. The drying technology that effectively improves the safety factor of the production process has become a hot topic in the preparation of airgel materials at home and abroad.

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