Super thermal insulation aerogel composite material and preparation process thereof

A composite material and preparation process technology, used in ceramic products, silicon compounds, other household appliances, etc., can solve problems such as poor compression performance, increased mass ratio, and lack of visibility, and achieve excellent thermal insulation performance, good compressibility, The effect of simple process

Active Publication Date: 2020-10-30
航天海鹰(镇江)特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the mechanical properties of silica airgel itself are not good. At present, silica airgel composite materials are actually used. Silica airgel composite materials are composed of silica airgel and reinforced fiber materials. Made
At present, the preparation method of silica airgel composite materials mainly adopts the sol-gel process method of "acid-base two-step catalytic method", and the sol-gel process method of two or more catalysts. The catalyst used in the process will cause certain corrosion to the equipment and certain harm to the human body
[0004] Moreover, the mass ratio of silica airgel in the airgel composite is about 30% to 60%, its compression performance is poor, and the thermal conductivity at room temperature is about 0.016 to 0.023W / mK, which greatly limits the use of silica airgel. Exploitation of the thermal insulation properties of airgel
At present, there is no silica airgel composite material with an increased mass proportion of silica airgel in the silica airgel composite material in the market, and no room temperature thermal conductivity <0.016W / mK Stabilized silica airgel composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Preparation of 2mm EVA foam reinforced silica airgel composite

[0024] Set the density to 0.03g / cm 3 , 2mm thick EVA foam is placed in a suitable dipping container, respectively take 10000g, 10000kg, 500kg, 100g of tetraethyl orthosilicate, ethanol, water and 0.2mol / L ammonium fluoride solution, and add them to a stainless steel stirring tank Mix evenly, stir for 10-20 minutes to prepare a sol; then inject the prepared sol into the container where the EVA foam is placed through an electric pump to ensure that the EVA foam is fully impregnated; then seal it and leave it in a 50°C environment for aging for 12 hours. A wet gel composite is obtained. Then the wet gel composite material was transferred into the hydrophobic reagent modifying solution containing 20kg trimethylethoxysilane and 300kg absolute ethanol, and modified for 96h. After the modification, the wet gel composite material is taken out and dried by supercritical fluid. The drying medium is carb...

Embodiment 2

[0026] Embodiment 2: Preparation of 3mm EPE pearl cotton reinforced silica airgel composite material

[0027] Set the density to 0.02g / cm 3 , 3mm thick EPE pearl cotton is placed in a suitable dipping container, respectively take 10000g, 60000kg, 2300kg, 500g of tetraethyl orthosilicate, ethanol, water and 0.2mol / L ammonium fluoride solution, and add it to a stainless steel mixing tank Mix evenly, stir for 10 to 20 minutes to prepare a sol; then inject the prepared sol into the container of EPE pearl cotton through an electric pump to ensure that the EPE pearl cotton is fully impregnated; then seal it and leave it in an environment of 55°C for aging for 8 hours. A wet gel composite is obtained. Then the wet gel composite material was transferred into a hydrophobic ten-grade modification solution containing 20 kg of hexamethyldisilazane and 300 kg of absolute ethanol, and modified for 60 h. After the modification, the wet gel composite material is taken out, and is also dried...

Embodiment 3

[0029] Example 3: Preparation of 1mm melamine foam sponge reinforced silica airgel composite

[0030] Set the density to 0.01g / cm3 , a melamine foam sponge with a thickness of 1mm is placed in a suitable dipping container, and 10000g, 90000g, 2500kg, 700g of tetraethyl orthosilicate, ethanol, water and 0.2mol / L ammonium fluoride solution are added to stainless steel and stirred Mix evenly in the tank, stir for 10-20 minutes to prepare a sol; then inject the sol into the container where the melamine foam sponge is placed through an electric pump to ensure that the melamine foam sponge is fully impregnated, then seal it and place it in an environment of 55°C for aging 12h. After aging, the wet gel was transferred into a hydrophobic reagent mixed modifying solution containing 30 kg of dimethyldimethoxysilane and 300 kg of absolute ethanol, and modified for 80 hours to obtain a wet gel composite material. After modification, the wet gel composite material is taken out, and superc...

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Abstract

The invention discloses a super thermal insulation aerogel composite material and a preparation process thereof, the aerogel composite material is formed by compounding silica aerogel and reinforced foam, the mass ratio of the silica aerogel in the aerogel composite material is 80%-95%, and the reinforced foam is a heat insulation sponge foaming material. The preparation method comprises the stepsof sol preparation, gum dipping aging, hydrophobic modification, drying treatment and the like, a single ammonium fluoride aqueous solution is adopted as a catalyst for sol preparation, one-step catalytic method for sol preparation is achieved, and the used catalyst is an ammonium salt, so that damage to equipment and a human body is avoided. According to the aerogel composite material prepared by the preparation method disclosed by the invention, the mass ratio of the silicon dioxide aerogel is about 80%-95%, the excellent performance of the silicon dioxide aerogel can be fully exerted, theheat insulation performance is excellent, and the compressibility is good.

Description

technical field [0001] The invention relates to a super heat-insulating airgel composite material and a preparation process thereof. Background technique [0002] Silica aerogel has a high specific surface area (about 1000m 2 / g), nanoscale pores (about 20nm), low density (0.003~0.15g / cm 3 ) and other special microstructures, which show unique properties in thermal, optical, electrical, acoustic and other aspects. Among them, in terms of heat, the nanoporous structure of airgel can effectively inhibit solid-state heat conduction and gas heat transfer, and has excellent thermal insulation properties. It is currently recognized as the solid material with the lowest thermal conductivity (0.01-0.03W / (mK at room temperature). )). [0003] However, the mechanical properties of silica airgel itself are not good. At present, silica airgel composite materials are actually used. Silica airgel composite materials are composed of silica airgel and reinforced fiber materials. made. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00C04B38/08C01B33/158
CPCC04B30/00C04B38/08C01B33/1585C04B2201/20C04B2201/32C04B16/082
Inventor 吴锦源殷龙盘景峰范凯运秦德勇基亚成
Owner 航天海鹰(镇江)特种材料有限公司
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