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Preparation method of aerogel composite thermal insulation material

A technology of composite thermal insulation material and aerogel, which is applied in the field of thermal insulation materials, can solve the problems of large amount of by-product hydrochloric acid, prolonged preparation cycle, corrosion of production equipment, etc., and achieve low production cost, reduced production cost, and small equipment loss.

Active Publication Date: 2019-03-22
LUYANG ENERGY SAVING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also many problems in normal pressure drying: for example, the wet gel needs to be repeatedly replaced with solvents before normal pressure drying, resulting in prolonged product preparation cycle; Alkylation reagent, the by-product hydrochloric acid is huge, which is easy to cause corrosion to production equipment

Method used

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preparation example Construction

[0022] The invention provides a method for preparing an airgel composite thermal insulation material, comprising the following steps:

[0023] a) mixing a silicon source, hexamethyldisilazane, a pH regulator and a solvent to obtain a silica sol precursor solution;

[0024] b) impregnating the silica sol precursor solution into a magnesium silicate fiber mat and leaving it to stand to form a wet gel mat;

[0025] c) Soaking the wet gel felt into organosiloxane at 40-90° C., taking it out and drying it with microwave heating to obtain an airgel composite thermal insulation material.

[0026] In the method provided by the present invention, the silicon source, hexamethyldisilazane, pH regulator and solvent are firstly mixed. Wherein, the silicon source includes but not limited to one or more of sodium silicate, acidic silica sol, alkaline silica sol, methyl orthosilicate and ethyl orthosilicate; agent and / or alkaline pH adjuster, said acidic pH adjuster includes but not limited...

Embodiment 1

[0032] (1) Preparation of silica sol precursor:

[0033] Prepare 8wt% industrial water glass solution and 20wt% nitric acid solution with deionized water at 5°C; first inject 10mL of absolute ethanol at 5°C into the stirrer, start stirring, and then add 6mL of hexamethyldisilazide in sequence Alkanes, 20mL of the nitric acid solution, and continued to stir for 10min; then add 40mL of the industrial water glass solution to it, and control the pH of the silica sol precursor solution to 5.4.

[0034] (2) Choose a bulk density of 96kg / m 3 Magnesium silicate fiber needle-punched felt (fiber diameter 2-5 μm) is used as the base material, and it is laid flat in a closed container around it, and the above-mentioned silica sol precursor solution is poured into the container to make the magnesium silicate fiber needle-punched The felt is saturated to adsorb the silica sol precursor solution.

[0035] (3) Let the needle-punched felt treated in step (2) stand for 10 minutes to form a we...

Embodiment 2

[0040] (1) Preparation of silica sol precursor:

[0041] Prepare 8wt% industrial water glass solution and 20wt% nitric acid solution with deionized water at 5°C; first inject 10mL of absolute ethanol at 5°C into the stirrer, start stirring, and then add 6mL of hexamethyldisilazide in sequence Alkanes, 20mL of the nitric acid solution, and continued to stir for 10min; then add 40mL of the industrial water glass solution to it, and control the pH of the silica sol precursor solution to 5.4.

[0042] (2) Choose a bulk density of 128kg / m 3 Magnesium silicate fiber needle-punched felt (fiber diameter 2-5 μm) is used as the base material, and it is laid flat in a closed container around it, and the above-mentioned silica sol precursor solution is poured into the container to make the magnesium silicate fiber needle-punched The felt is saturated to adsorb the silica sol precursor solution.

[0043] (3) Let the needle-punched felt treated in step (2) stand for 10 minutes to form a w...

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Abstract

The invention provides a preparation method of an aerogel composite thermal insulation material. The method comprises the following steps: (a), mixing a silicon source, hexamethyl-disilazane, a pH regulator and a solvent; (b), soaking a silica sol precursor solution obtained through mixing into a magnesium silicate fiber felt, and leaving the solution to stand, so as to obtain a wet gel felt body;(c), soaking the wet gel felt body into 40 to 90 DEG C organo-siloxane, and then performing microwave drying, so as to obtain the aerogel composite thermal insulation material. The method has the advantages that purification, ageing, solvent exchange and alkylation treatment of the wet gel felt body can be synchronously realized by soaking the wet gel felt body formed in the step (b) into an organo-siloxane solution on the basis of the improvement of a precursor solution formula, so that the preparation period of a material is greatly reduced, the drying difficulty of the material can be further reduced through the treatment, and the materials can be rapidly dried under normal pressure through subsequent microwave drying, in addition, chlorine ion is not introduced during the material preparation, so that corrosion to adopted equipment is small.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of an airgel composite thermal insulation material. Background technique [0002] Silica airgel composite thermal insulation material is a new type of thermal insulation material that has emerged in recent years. Its thermal conductivity at room temperature is ≤0.023w / (m.k), which has obvious advantages compared with traditional thermal insulation materials, and its thermal insulation effect is better. It has been widely used in aerospace, military industry, metallurgy, petrochemical, energy-saving buildings, comprehensive utilization of solar energy and other fields. [0003] At present, most of the silica airgel composite insulation materials use alkali-free glass fiber mat or aluminum silicate fiber mat as the base material, and no matter whether glass fiber mat or aluminum silicate fiber mat is used as the silica airgel composite in...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B30/02C04B2201/20C04B2201/32C04B14/4643C04B14/064
Inventor 王振宇张成贺郑维金任大贵鹿成洪刘超岳耀辉
Owner LUYANG ENERGY SAVING MATERIALS CO LTD
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