A kind of transparent thermal insulation coating containing silica airgel and preparation method thereof

A thermal insulation, silicon oxide-containing technology, used in fire-resistant coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of loss of aerogel thermal insulation performance, low strength, loss of nano-porous structure, etc. The effect of high visible light transmittance, excellent coating performance and simple preparation process

Active Publication Date: 2020-10-30
NANJING WEICAI NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the extremely low solid content and density of airgel, its skeleton is slender and its strength is low.
Moreover, because there are many nanopores on the surface of the airgel, the low-molecular-weight liquid substances in the coating system can easily enter the micropores, resulting in huge capillary forces, which cause the airgel skeleton to collapse, lose the nanoporous structure, and then lose the excellent properties of the airgel. The thermal insulation performance restricts its engineering application

Method used

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  • A kind of transparent thermal insulation coating containing silica airgel and preparation method thereof
  • A kind of transparent thermal insulation coating containing silica airgel and preparation method thereof
  • A kind of transparent thermal insulation coating containing silica airgel and preparation method thereof

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preparation example Construction

[0033] A preparation method of a transparent thermal insulation coating containing silica airgel, comprising the following steps:

[0034] (1) Airgel powder modification;

[0035] (2) Surface-coating the airgel powder in step (1);

[0036] (3) Mix the airgel powder in step (2) with the water-based transparent resin and stir.

[0037] In this way, through the above preparation process, a transparent thermal insulation coating containing silica airgel with a thermal conductivity of 0.02-0.06 W / m K and a visible light transmittance of 65%-95% can be prepared. The coating has excellent performance. The price is low, the paint preparation process is simple, practical and suitable for industrialized production.

[0038] In this embodiment, the step (1) includes a hydrophobic modification step; the hydrophobic modification is to perform hydrophobic modification on the airgel powder in a closed gas-phase environment of the hydrophobic modifier; the hydrophobic modifier Chlorotrimet...

Embodiment 1

[0052] The following steps are adopted to prepare the transparent thermal insulation coating containing silica airgel:

[0053] (1) Detection of SiO to be treated using a contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 31°, and then SiO with a particle size of 22 μm 2 The airgel powder is placed in a vacuum heating furnace, and the weighed hexamethyldisilazane is placed in a vacuum heating furnace with a container, heated and vaporized, and hydrophobically modified for 2.5 hours to obtain hydrophobic SiO 2 Airgel powder, detection of hydrophobic SiO by contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 150°;

[0054] (2) At room temperature, weigh n-hexane, glycerin and deionized water at a mass ratio of 1:0.5:15, mix them evenly, and prepare a surface hydrophilic modification solution;

[0055] (3) According to hydrophobic SiO 2 The volume ratio of th...

Embodiment 2

[0062] The following steps are adopted to prepare the transparent thermal insulation coating containing silica airgel:

[0063] (1) Detection of SiO to be treated using a contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 31°, and then SiO with a particle size of 88 μm 2 The airgel powder is placed in a vacuum heating furnace, and the weighed trimethylchlorosilane is placed in a vacuum heating furnace with a container, heated and vaporized, and hydrophobically modified for 1.5 hours to obtain hydrophobic SiO 2 Airgel powder, detection of hydrophobic SiO by contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 150°;

[0064] (2) At room temperature, weigh n-hexane, sodium alkylbenzenesulfonate and deionized water at a mass ratio of 1:0.5:1000, mix them evenly, and prepare a surface hydrophilic modification solution;

[0065] (3) According to hydrophobic SiO 2...

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Abstract

The invention discloses a transparent thermal-insulation coating containing silicon oxide aerogel and a preparation method of the coating. The transparent thermal-insulation coating containing silicon oxide aerogel is characterized by mainly comprising transparent resin and aerogel powder. The preparation method of the transparent thermal-insulation coating containing silicon oxide aerogel comprises the steps as follows: (1) modification of aerogel powder; (2) surface coating of the aerogel powder in step (1); (3) mixing and stirring of the aerogel powder in step (2) and waterborne transparent resin. The transparent thermal-insulation coating containing silicon oxide aerogel has high visible light transmittance and low heat conduction coefficient, the preparation process of the coating is simple, and the coating is practical, excellent in performance, low in price and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of chemical coatings, in particular to a transparent thermal insulation coating containing silicon oxide airgel and a preparation method thereof. Background technique [0002] Energy conservation is a long-term strategic policy for my country's economic development. In cold regions such as northern my country, heat loss through building glass accounts for more than 50% of heating energy consumption. For cold regions such as northern my country, the principle of design and use of architectural glass should be to allow solar heat radiation to fully enter the interior of the building through glass windows in winter, while minimizing heat loss through glass windows. The traditional solution is to use insulating glass, metal-coated heat-reflecting glass, low-emissivity coated glass, and various heat-reflecting films to achieve heat insulation. However, these solutions have problems such as unsatisfactory light transmitta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/00C09D175/04C09D183/04C09D7/62C09D5/18C09C1/28C09C3/10C09C3/12C09C3/08
CPCC08K3/36C08K7/26C08K9/04C08K9/06C08K9/10C09D5/18C09D133/00C09D175/04C09D183/04
Inventor 卢锋
Owner NANJING WEICAI NEW ENERGY TECH
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