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Self-dimming transparent composite aerogel and preparation method thereof

A composite aerogel and self-adjusting technology are applied in the field of transparent composite aerogel and its preparation, self-adjusting transparent composite aerogel and its preparation field, which can solve the problems of unfavorable winter heating and affecting indoor natural lighting and the like , to achieve the effects of low cost, excellent thermal insulation, and simple preparation process

Active Publication Date: 2019-01-04
湖南大途新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing door and window technology mainly uses Low-E coated glass, although it can effectively prevent too much solar radiation from entering the room in summer, but it is not conducive to heating in winter, and to a certain extent affects the natural lighting of the room

Method used

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  • Self-dimming transparent composite aerogel and preparation method thereof

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preparation example Construction

[0035] Another embodiment of the present invention, a method for preparing a self-adjusting transparent composite airgel, is characterized in that it comprises the following steps:

[0036] (1) Preparation of matrix gel, mix and stir organosilane, deionized water, organic solvent and acid catalyst, hydrolyze for 4~60h, add alkali catalyst, stir, react for 0.01~1h to obtain silica sol, gel, A matrix gel is obtained, wherein the volume ratio of organosilane, deionized water, organic solvent, acid catalyst, and base catalyst is 1:0.05~5:0.5~8:0.0025~0.5:0.0025~0.5;

[0037] (2) Preparation of thermochromic gel, prepare silica sol according to step (1), and then VO 2 The nanoparticle dispersion is added to the silica sol, stirred evenly, and then cast onto the surface of the matrix gel obtained in step (1), and quickly gelled by chemical catalysis or high-energy catalysis to obtain a thermochromic gel, wherein VO 2 The volume ratio of nanoparticle dispersion to silica sol is 0.00...

Embodiment 1

[0052] (1) At 40°C, mix and stir methyl orthosilicate, deionized water, methanol, and dilute hydrochloric acid, stir and react for 40 hours, then add dilute ammonia water, stir, and react for 0.5 hours to obtain silica sol, gel, and matrix Gel, wherein the volume ratio of methyl orthosilicate, deionized water, methanol, dilute hydrochloric acid, and dilute ammonia water is 1:0.1:0.5:0.0025:0.025, and the concentration of dilute hydrochloric acid and dilute ammonia water is 0.3mol / L;

[0053] (2) Prepare silica sol according to the method of step (1), and then VO 2 Add the nanoparticle alcohol dispersion to the silica sol, stir evenly, and then cast it on the surface of the matrix gel, and use microwave catalysis to make VO 2 The nanoparticles are evenly distributed in the silica sol and quickly gel to obtain a thermochromic gel, in which VO 2 The volume ratio of the nanoparticle alcohol dispersion to the silica sol is 0.001%;

[0054] (3) Preparation of composite gel, prepar...

Embodiment 2

[0057] (1) At 0°C, mix and stir ethyl orthosilicate, deionized water, ethanol, and dilute hydrochloric acid, stir and react for 60 hours, then add aqueous sodium hydroxide solution, stir, and react for 1 hour to obtain silica sol, gel, and Matrix gel, in which the volume ratio of ethyl orthosilicate, deionized water, ethanol, dilute hydrochloric acid, and aqueous sodium hydroxide solution is 1:0.05:8:0.5:0.0025, and the concentration of dilute hydrochloric acid and aqueous sodium hydroxide solution is 0.3 mol / L;

[0058] (2) Prepare silica sol according to the method of step (1), and then VO 2 The aqueous dispersion of nanoparticles is added to the silica sol, stirred evenly, and then cast on the surface of the matrix gel, and VO is catalyzed by chemical acid and alkali. 2 The nanoparticles are evenly distributed in the silica sol and quickly gel to obtain a thermochromic gel, in which VO 2 The volume ratio of the nanoparticle aqueous dispersion to the silica sol is 0.5%;

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Abstract

The invention discloses self-dimming transparent composite aerogel and a preparation method thereof. The self-dimming transparent composite aerogel is characterized by comprising one aerogel layer, athermochromic layer and another aerogel layer, and the thermochromic layer is a composite aerogel layer with vanadium dioxide nanoparticles inside. The invention further provides a preparation methodof the self-dimming type transparent composite aerogel. The preparation method comprises the following steps of preparation of matrix gel, preparation of thermochromic gel, preparation of composite gel and supercritical drying. The temperature control type transparent composite aerogel has excellent heat insulation and heat preservation effects, is light, transparent, soundproof, resistant to explosion, capable of reducing vibration and absorbing energy and the like, and also has a self-dimming characteristic, that is, the optical performance of the aerogel can be automatically adjusted through ambient temperature change. The energy-saving efficiency is improved; moreover, the preparation process is simple, convenient and practical, and the application value is very high.

Description

technical field [0001] The invention relates to a self-adjusting transparent composite airgel and a preparation method thereof, in particular to a transparent composite airgel with temperature phase transition characteristics and a preparation method thereof, belonging to the field of new inorganic intelligent materials. technical background [0002] At present, my country's energy and environmental problems are becoming more and more serious, while the situation of energy conservation and emission reduction is still quite severe. Doors and windows are the weak link of building energy conservation, and the key and bottleneck restricting the improvement of my country's building energy conservation level. For doors and windows, the technical approaches to be solved are mainly: (1) To improve the thermal performance of doors and windows, the heat transfer coefficient is required to be ≤1.0W / m 2 K; (2) Block the absorption of mid- and far-infrared light by doors and windows; (3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C09K9/00
CPCB01J13/0091C09K9/00
Inventor 卢军卢孟磊张丁日卢梦言左小荣卢珊卢斌
Owner 湖南大途新材料有限公司
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