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Sio2 aerogel with thermochromic function and preparation method thereof

A thermochromic and aerogel technology, applied in the field of nanoporous materials, can solve the problems of airgel intelligence, such as too many attempts, to achieve intelligent response, thermal insulation performance, adsorption, uniform color, and simple process Effect

Active Publication Date: 2019-02-12
苏州同玄新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the preparation of existing silica aerogels has not made too many attempts to make aerogels intelligent

Method used

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  • Sio2 aerogel with thermochromic function and preparation method thereof
  • Sio2 aerogel with thermochromic function and preparation method thereof
  • Sio2 aerogel with thermochromic function and preparation method thereof

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preparation example Construction

[0036] One aspect of the present invention provides a SiO with thermochromic function 2 The preparation method of airgel, it comprises the steps:

[0037] (1) Partially hydrolyze orthosilicate to form polysiloxane (also known as CS silicone oil);

[0038] (2) The polysiloxane is uniformly mixed with the color-changing microcapsule alcohol solution, alcohol, and basic catalyst to form the color-changing microcapsule / SiO 2 Complex alcohol gel (also known as temperature-changing powder / SiO 2 complex alcohol gel);

[0039] (3) the temperature variable powder / SiO 2 The complex alcohol gel is left to age for several days, and then replaced by solvent to obtain an alcohol gel with a stronger network structure;

[0040] (4) The alcohol gel is supercritically dried to obtain SiO with thermochromic function 2 airgel. In a preferred embodiment, step (1) includes: mixing a silicon source, such as an orthosilicate, with a hydrolysis catalyst and alcohol, stirring evenly, and refluxing ...

Embodiment 1

[0061] (1) Preparation of CS silicone oil: 1 mole of tetraethyl orthosilicate, 1.3 mole of dilute solution (10 -4 mol / l), ethanol (180ml), and refluxed for 10 hours for later use.

[0062] (2) Red color-changing microcapsules / SiO 2 Composite gel preparation: Take 2 parts of CS silicone oil, 3 parts of ethanol and 0.001mg / ml color-changing microcapsules in a stirring tank, drop 1-2ul concentrated ammonia water under stirring conditions, stir at 300rpm, stir for 10min and then let stand to form a compound alcohol gel.

[0063] (3) Gel aging and solvent replacement: the obtained complex alcohol gel was aged at room temperature for 3 days, and at the same time, the ethanol solvent was changed every 12 hours to make the solvent replacement sufficient, and a silica alcohol gel with complete solvent replacement was obtained.

[0064] (4) Supercritical drying: Put the obtained silica alcohol gel completely replaced by solvent in a carbon dioxide supercritical drying kettle, set the ...

Embodiment 2

[0066] (1) Preparation of CS silicone oil: 1 mole of methyl orthosilicate, 1.3 moles of dilute acid solution (concentration of 10 -2 mol / L), ethanol (100ml) mixed, refluxed for 8h and then set aside.

[0067] (2) Pink color-changing microcapsules / SiO 2 Synthesis of composite airgel: Take 2 parts of CS silicone oil, 3 parts of ethanol, and 0.12mg / ml color-changing microcapsules in a stirring tank, add 1-2ul concentrated ammonia water under stirring, the stirring speed is 800rpm, after stirring for 30min, let it stand A complex alcohol gel is formed.

[0068] (3) Gel aging and solvent replacement: Aging the obtained composite alcohol gel at room temperature for 3 days, and at the same time changing the ethanol solvent every 12 hours to fully replace the solvent, and obtain a completely solvent-substituted silica alcohol gel.

[0069] (4) Supercritical drying: Put the obtained silica alcohol gel completely replaced by solvent in a carbon dioxide supercritical drying kettle, set...

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Abstract

The invention discloses SiO2 aerogel with a thermochromism function and a preparation method thereof. The SiO2 aerogel mainly comprises a SiO2 gel network skeleton and color-variable microcapsules dispersed in the skeleton. The SiO2 aerogel has a nanometer porous structure with aperture sizes of 10 nanometers to 50 micrometers, has density of 0.05-0.90g / cm<3>, a specific surface area of 100-1200m<2> / g and a thermochromism critical temperature of 10-80 DEG C. The preparation method comprises mixing polyethoxydisiloxanes with different polymerization degrees as silicon sources, the color-variable microcapsules, alcohol and an alkali catalyst to obtain a uniform mixture, carrying out standing to obtain gel, carrying out solvent replacement and carrying out supercritical drying to obtain a desired product. The SiO2 aerogel with a thermochromism function has ideal density, thermal conductivity and specific surface area, has effects of thermal insulation and heat isolation, and realizes reversible color change along with ambient temperature change thereby realizing ambient temperature indication.

Description

technical field [0001] The invention relates to a preparation process of silica airgel, in particular to a method for preparing silica airgel with thermochromic function by supercritical drying, and belongs to the technical field of nanoporous materials. Background technique [0002] Airgel mainly refers to a solid material formed by the aggregation of nanometer-scale ultrafine particles. It has a continuous three-dimensional network skeleton structure and is the solid with the smallest density. At present, the lightest silica airgel is only 3mg / cm 3 , three times heavier than air, also known as "frozen smoke" or "blue smoke". Its porosity can reach 80-99.8%, the particle size is between 1-100nm, and the specific surface area can reach 1000m 2 / g or more, the thermal conductivity is extremely low, and the room temperature vacuum thermal conductivity can reach 0.001W / m·K. Due to its unique nanostructure, the characteristics of airgel in terms of optics, mechanics, electrici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C01B33/16C09K9/00B01J20/10
Inventor 张学同危勇王锦
Owner 苏州同玄新材料有限公司
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