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Aerogel heat insulation composite material and preparation method thereof

A composite material and aerogel technology, applied in the field of silica aerogel thermal insulation composite material and its preparation, can solve the problems of low strength, reduced thermal insulation effect, difficult and uniform dispersion of infrared sunscreen agents, etc. The effect of blocking infrared radiation heat transfer

Inactive Publication Date: 2010-01-20
LUYANG ENERGY SAVING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent low strength, high brittleness, and difficulty in forming of airgel materials limit the practical use of large areas or large areas.
Existing ways to solve this problem mainly contain the following categories: (1) adopt organic or inorganic adhesives to mix with airgel powder materials, and form them by pressing. Although the strength of materials is improved to a certain extent due to the addition of binders, However, the high-efficiency thermal insulation effect of airgel materials is difficult to guarantee; (2) The material formed by adding inorganic reinforcing agent (short fiber) and infrared opacifier (titanium dioxide) to form a gel in the sol process and then dried by supercritical fluid , the infrared opacifier is difficult to disperse evenly, and the mechanical strength is still difficult to meet the requirements of harsh environments; (3) the fiber is used as the reinforcing phase, and the airgel composite material is formed by the sol-gel process and the supercritical fluid drying process. The above materials have good thermal insulation effect and performance, but the process of depositing molecular carbon or metal on the surface of the fiber to reduce the infrared transmittance is relatively complicated; in addition, the hydrophobicity of the made material is poor, and in the actual use process, due to water absorption, The insulation effect will be reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Water glass: acetic acid: formamide: the mol ratio of ethylene glycol is 1: 0.35: 1.5: 0.8, the concentration of water glass is 20%, the concentration of formamide is 30%, water glass, formamide, ethylene glycol are fully Mix well and add acetic acid dropwise to make a gel. The gel was aged in ethanol at room temperature for 70 hours, washed 5 times with tap water to remove sodium ions, washed 3 times with deionized water, then soaked in absolute ethanol for 72 hours, dried at room temperature for 12 hours, and then dried at 110°C for 12 hours. Hours, porous silica powder was obtained. Prepare silica sol with ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in a molar ratio of 1:10:3:0.015, add the above-mentioned 8% porous powder, 3% titanium dioxide, 10% kaolin and 8% silicic acid aluminum fiber, then add ammonia water (concentration is 1%) and adopt pouring process to form, and place at room temperature to age for 120 hours, carry out no...

Embodiment 2

[0033] Water glass: sulfuric acid: formamide: the mol ratio of ethylene glycol is 1: 0.3: 1: 0.8, and the concentration of water glass is 25%, and the concentration of sulfuric acid is 0.2mol / L, and the concentration of formamide is 25%, and water Mix glass, formamide, and ethylene glycol thoroughly, and add sulfuric acid drop by drop to make it into a gel. The gel was aged in ethanol at room temperature for 70 hours, washed 5 times with tap water to remove sodium ions, washed 3 times with deionized water, then soaked in absolute ethanol for 72 hours, dried at room temperature for 12 hours, and then dried at 110°C for 12 hours. Hours, porous silica powder was obtained. Prepare silica sol with tetraethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in a molar ratio of 1:6:3:0.001, add the above-mentioned 10% porous powder, 5% titanium dioxide, 8% silicon micropowder and 8% silicon Alumina fiber, then add ammonia water (concentration is 1%) and adopt ...

Embodiment 3

[0035] Water glass: acetic acid: formamide: the mol ratio of ethylene glycol is 1: 0.4: 2: 0.8, the concentration of water glass is 22%, the concentration of formamide is 30%, water glass, formamide, ethylene glycol are fully Mix well and add acetic acid dropwise to make a gel. The gel was aged in ethanol at room temperature for 70 hours, washed 5 times with tap water to remove sodium ions, washed 3 times with deionized water, then soaked in absolute ethanol for 72 hours, dried at room temperature for 12 hours, and then dried at 110°C for 12 hours. Hours, porous silica powder was obtained. Ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid are made into silica sol in a molar ratio of 1:8:3.5:0.005, and the above-mentioned 12% porous powder, 3% iron oxide, 15% wollastonite and 10 % glass fiber, then add ammonia water (concentration is 1%) and adopt pouring process to form, after treating that its gel is aged in ethanol solution for 5 days, carry out ...

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PUM

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Abstract

The invention relates to an aerogel heat insulation composite material and a preparation method thereof, which belong to the technical field of aerogel heat insulation composite materials. The aerogel heat insulation composite material comprises silicon dioxide aerogel, an infrared sunscreen titanium dioxide and a fortifying fiber which does not react with sols. The aerogel heat insulation composite material is characterized by further comprising the following raw materials which do not react with the sols: the silicon dioxide aerogel, the infrared sunscreen titanium dioxide, the fortifying fiber, and a packing material in a ratio of 1:0.1-0.5:0.5-3:0.5-2, wherein the packing material is one or a mixture of any two of kaolin, attapulgite, sepiolite, wollastonite, diatomite and silicon micro-powder. The aerogel heat insulation composite material has good heat insulation performance and high mechanical strength, and the serviceability temperature thereof can reach 1,000 DEG C.

Description

technical field [0001] The invention relates to an airgel thermal insulation composite material and a preparation method thereof, in particular to a silica airgel thermal insulation composite material and a preparation method thereof. technical background [0002] Silica airgel has the characteristics of high specific surface area, ultra-low density and nanoporous network structure, and is considered to be the solid material with the best thermal insulation performance at present. However, factors such as inherent low strength, high brittleness, and difficulty in forming airgel materials limit their practical use in large areas or in large areas. Existing ways to solve this problem mainly contain the following categories: (1) adopt organic or inorganic adhesives to mix with airgel powder materials, and form them by pressing. Although the strength of materials is improved to a certain extent due to the addition of binders, However, the high-efficiency thermal insulation effe...

Claims

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Application Information

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IPC IPC(8): C04B32/00C01B33/18
CPCC04B2111/00827C04B30/02C04B2111/28
Inventor 鹿成洪魏昊刘超李京友张宽心
Owner LUYANG ENERGY SAVING MATERIALS CO LTD
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