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Aerogel recombination flexible thermal insulation heat-proof thin film and process for preparing same

A thermal insulation and aerogel technology, applied in the field of thermal insulation materials, can solve problems such as difficulty in forming, hindering widespread use, and not in the field of thermal insulation, etc., and achieve the effects of reduced production costs, expanded application range, and high porosity

Inactive Publication Date: 2004-11-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the actual use is not much. This is mainly due to the lack of mechanical strength of airgel and the difficulty of forming, which hinders the widespread use of large areas or large areas.
In order to solve this problem, someone tries to compound airgel with other materials (Chinese patent 95197068.2 "a composite material containing airgel, its preparation method and application" 96196879.6 "composite material containing airgel and adhesive, its Preparation method and its application"), but its products are all composite plates, which are not suitable for covering special-shaped objects, and are not specially used in the field of thermal insulation

Method used

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  • Aerogel recombination flexible thermal insulation heat-proof thin film and process for preparing same

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Embodiment 1

[0024] Mix 100ml of tetraethyl orthosilicate, 1000ml of absolute ethanol, 50ml of distilled water and 10ml of HF evenly, stir for 0.5hr, and store it statically for 3hr to obtain SiO 2 wet gel. Then SiO 2 The wet gel was put into a solution uniformly mixed with 1000ml of n-hexane and 100ml of trimethylchlorosilane for surface modification. Take it out after 24 hours, put it into an oven after the surface is dry, and heat it to 200°C for heat treatment to obtain transparent SiO 2 porous airgel.

Embodiment 2

[0026] The modified transparent SiO 2 Porous airgel is sieved and crushed to small particles with a diameter of less than 3mm, mixed with silicone resin at a volume ratio of 1:0.6 to form a paste, poured into the hopper of the coating machine, and coated on polyamide with a coating machine. On the imide film, the coating thickness is 3mm. The running speed of the film on the coating machine is 5m / min, the temperature of the drying tunnel is 110°C, and the film is dried in the drying tunnel of the coating machine.

Embodiment 3

[0027] Embodiment 3: The coated composite film is sent into a continuous vacuum coating machine, and a metal aluminum (Al) film is deposited on the surface of the film that is not coated with the composite material with a conventional vacuum aluminum plating method. The working vacuum is 4×10 -2 pa, the evaporation source is 98% aluminum wire, and the running speed of the film on the coating machine is 50m / min. That is, the desired flexible thermal insulation film with good performance can be obtained.

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Abstract

The invention is a kind of aerogel compound soft thermal retardation and insulation film and the manufacturing method. It uses orthosilicate ethyl ester and distilled water as material; the invention can produce transparent SiO2 multi-aperture aerogel with colloidal sols and jell. The aperture rate of the aerogel is bigger than 90%, the aperture radius size is about 20nm, the volume density is 0.03g / cm3, the specific surface is 1120m2 / g, the aerogel is blended with organic silicon resin after being crushed, and they are distributed onto polymide film. The other surface of the polymide uses vacuum plating deposited metal aluminum film forms the compound soft thermal retardation film which uses SiO2 multi-aperture aerogel / polymide film / metal aluminum as structure, the heat conductivity of aerogel compound soft thermal insulation film is 0.035w / mk under temperature of 500oC; it is a kind of excellent thermal insulation materials.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to an airgel composite flexible thermal insulation film and a preparation method thereof. Background technique [0002] SiO 2 Airgel is a porous material with high specific surface area and low density. Due to the existence of nano-network structure, the material itself has special properties. It has a wide range of applications in many fields such as optics, electricity, acoustics, environmental protection, and metallurgy. The prospect is listed as the world's top ten popular science and technology by the 250th issue of "Science" in the United States. There are also many people in our country who are doing research in this area. SiO 2 Nanoporous aerogel, as a lightweight and high-efficiency thermal insulation material, is currently the solid material with the best thermal insulation performance (Nicola Huling Ulrich Schubert Angew Chem Int Ed. 19...

Claims

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Application Information

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IPC IPC(8): B32B13/06B32B13/12
Inventor 倪星元黄耀东程银兵沈军周斌吴广明
Owner TONGJI UNIV
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