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Silica aerogel microsphere composite thermal insulation coating

A technology of silica and thermal insulation coatings, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of reducing the internal gas phase heat conduction and convective heat transfer of airgel, and the decrease of thermal conductivity of silica airgel, etc. Achieve the effect of improved heat insulation performance, low density and good weather resistance

Inactive Publication Date: 2013-10-02
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of nanopores inside the silica airgel limit the collision between gas molecules, so that the gas molecules are approximately adsorbed on the walls of the nanopores, thereby reducing the gas-phase heat conduction and convective heat transfer inside the aerogel, making the silica The thermal conductivity of airgel is greatly reduced

Method used

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  • Silica aerogel microsphere composite thermal insulation coating
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Examples

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example 1

[0032] Mix tetraethyl orthosilicate (TEOS) with absolute ethanol (Ethanol) and deionized water and stir evenly, then add nitric acid to mix and stir. The molar ratio of raw materials used is TEOS: Ethanol: deionized water: nitric acid = 1:0 ~15: 1~10: 0.0005~0.08 Then put the mixed solution in a water bath and keep it warm for more than 1 hour to obtain silica sol; use an atomizer to spray the silica sol into the oil phase, the diameter of the nozzle of the atomizer is 0.1mm, ensure that the oil phase has a rotational speed of 500r / min~1000r / min during the atomization process. The oil phase selected for atomization is to disperse the wet gel microspheres evenly, and ensure that the volume of the sol in the oil phase does not exceed 1 / 5 of the volume of the oil phase during atomization. After the atomization is completed, ammonia water is added to the mixed solution. The amount of ammonia water is based on the fact that the mixed solution begins to produce gel, and aged at room...

example 2

[0036] Mix tetraethyl orthosilicate (TEOS) with absolute ethanol (Ethanol) and deionized water and stir evenly, then add nitric acid to mix and stir. The molar ratio of raw materials used is TEOS: Ethanol: deionized water: nitric acid = 1:0 ~15: 1~10: 0.0005~0.08 Then put the mixed solution in a water bath and keep it warm for more than 1 hour to obtain a silica sol; use an atomizer to spray the silica sol into the oil phase, and use A nozzle with a diameter of 0.1mm and a nozzle with a diameter of 0.3mm are atomized, and the oil phase is guaranteed to have a rotational speed of 500r / min to 1000r / min during the atomization process. The oil phase selected for atomization is to disperse the wet gel microspheres evenly, and ensure that the volume of the sol in the oil phase does not exceed 1 / 5 of the volume of the oil phase during atomization. After the atomization is completed, ammonia water is added to the mixed solution. The amount of ammonia water is based on the fact that th...

example 3

[0039] Mix 208g of tetraethyl orthosilicate (TEOS) with 322g of absolute ethanol (Ethanol), 72g of deionized water and stir evenly, then add 1ml of 2w% nitric acid and mix and stir, then put the mixed solution in a water bath and keep it warm for more than 1h. Obtain the silica sol; spray the silica sol into the oil phase with an atomizer, the diameter of the atomizer nozzle is 0.1 mm, and ensure that the oil phase has a rotational speed of 500r / min-1000r / min during the atomization process. The oil phase selected for atomization is to disperse the wet gel microspheres evenly, and ensure that the volume of the sol in the oil phase does not exceed 1 / 5 of the volume of the oil phase during atomization. After the atomization is completed, ammonia water is added to the mixed solution. The amount of ammonia water is based on the fact that the mixed solution begins to produce gel, and aged at room temperature for two days to obtain silica wet gel microspheres. Filter the silica w...

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Abstract

The invention discloses a novel composite thermal insulation coating using silica aerogel microsphere as a thermal insulation filler. The main preparation process is as follows: mixing self-made silica aerogel microspheres with a polymer emulsion to obtain a silica aerogel composite thermal insulation coating with excellent heat insulation property. Compared with the existing coating in the market, the silica aerogel composite thermal insulation coating has greatly improved the thermal insulation property. The invention employs an atomization method to prepare the silica aerogel microspheres of micron size level, which have high filling rate of up to 70% in the coating. During the atomization process, the size of the silica aerogel microspheres is regulated by controlling the size of a nozzle. The invention also provides a method for preparing thermal insulation coating from silica aerogel microspheres with mixed grain size. Mixture of silica aerogel microspheres with different particle sizes is helpful to improving packing density of the silica aerogel microspheres in the coating, so as to reduce thermal conductivity of the coating to the minimum.

Description

technical field [0001] The invention relates to a novel heat-insulating coating which uses silicon dioxide airgel as a functional filler. Silica airgel is a new type of thermal insulation material with unique nanopores and three-dimensional network structure. This material has extremely low thermal conductivity and excellent thermal insulation effect. The use of silica airgel as a thermal insulation filler is a bold attempt in the field of thermal insulation. It can significantly improve the thermal insulation performance of existing thermal insulation coatings and improve energy efficiency. Silica airgel composite thermal insulation coating not only has good thermal insulation, but also is lightweight, environmentally friendly and pollution-free, and has great potential application value in many fields including construction, military, aerospace and so on. Background technique [0002] With the development of our society, a large number of buildings have emerged in various...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D163/00C09D133/04C09D125/14
Inventor 何方吴菊英黄渝鸿郑伟张瑞珠王宏雁马秋花朱贺
Owner HENAN UNIVERSITY OF TECHNOLOGY
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