Super-hydrophobic radiation cooling porous film and preparation method thereof

A porous film and super-hydrophobic technology, applied in the field of super-hydrophobic radiation cooling porous film and its preparation, can solve the problems of affecting the cooling effect and service life of the material, and be easily polluted, achieve stable super-hydrophobicity and radiation cooling performance, simplify the Operation process and production cost, the effect of simple operation

Inactive Publication Date: 2022-03-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared film has high solar reflectance and mid-infrared emissivity, toxic and harmful solvents need to be used in the preparation process, and it is easily polluted when it is used outdoors, which affects the cooling effect and service life of the material

Method used

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  • Super-hydrophobic radiation cooling porous film and preparation method thereof
  • Super-hydrophobic radiation cooling porous film and preparation method thereof
  • Super-hydrophobic radiation cooling porous film and preparation method thereof

Examples

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preparation example Construction

[0045] A method for preparing a superhydrophobic radiation-cooled porous film of the present invention, specifically comprising the following steps:

[0046] S1. Weigh a certain amount of PDMS prepolymer A and curing agent B components;

[0047] S2, take a certain amount of water;

[0048] S3. Add the water described in step S2 dropwise to the PDMS mixture described in step S1, keep the beaker sealed, and stir at room temperature for 2 hours to obtain a milky white emulsion, which is polydimethylsiloxane Alkane / water (PDMS / Water) emulsion;

[0049] S4. Pouring the milky white emulsion described in step S3 in a petri dish, and vacuum degassing for a certain period of time to remove internal micro-bubbles;

[0050] S5. After sealing the emulsion described in step S4, curing treatment at 45-70° C. for 4.5-6.0 hours to obtain a PDMS film containing water inside;

[0051] S6. Unseal the PDMS film containing water inside as described in step S5, and dry it at 120-200° C. for 120-...

Embodiment 1

[0060] The preparation process of the superhydrophobic radiation cooling porous film in this embodiment includes the following steps:

[0061] step 1

[0062] Weigh 9.0g of PDMS prepolymer A and 1.0g of curing agent B, add them to the beaker, keep the beaker sealed, and stir it with a constant speed stirrer at room temperature to obtain a uniform PDMS mixture; then weigh 9.0g Water, using a peristaltic pump to control the dropping rate to 3.5mL / min, add 9.0g of water dropwise to the PDMS mixture in step 1 to form a milky white emulsion, which is the PDMS / Water emulsion.

[0063] step 2

[0064] The emulsion obtained in step 1 was cast in a petri dish, and vacuum degassed at 20° C. for 45 minutes to remove air bubbles.

[0065] step 3

[0066] The emulsion obtained in step 2 was sealed and cured at 45° C. for 4.5 hours to obtain a PDMS film containing water inside.

[0067] step 4

[0068] The PDMS film obtained in step 3 was dried at 120° C. for 120 minutes to remove inte...

Embodiment 2

[0073] The preparation process of the superhydrophobic radiation cooling porous film in this embodiment includes the following steps:

[0074] step 1

[0075] Weigh 9.0g of PDMS prepolymer A and 1.0g of curing agent B, add them to the beaker, keep the beaker sealed, and stir it with a constant speed stirrer at room temperature to obtain a uniform PDMS mixture; then weigh 10.0g Water, using a peristaltic pump to control the dropping rate to 3.5mL / min, add 10.0g of water dropwise to the PDMS mixture in step 1 to form a milky white emulsion, which is the PDMS / Water emulsion.

[0076] step 2

[0077] The emulsion obtained in step 1 was cast in a petri dish, and vacuum degassed at 20° C. for 45 minutes to remove air bubbles.

[0078] step 3

[0079] The emulsion obtained in step 2 was sealed and cured at 45° C. for 4.5 hours to obtain a PDMS film containing water inside.

[0080] step 4

[0081] The PDMS film obtained in step 3 was dried at 120° C. for 120 minutes to remove in...

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Abstract

The preparation method comprises the following steps: mixing a polydimethylsiloxane (PDMS) prepolymer A and a PDMS curing agent B to form a PDMS mixture, dropwise adding a certain amount of water under mechanical stirring, dispersing water molecules into fine liquid drops, wrapping the fine liquid drops with PDMS to form a PDMS-in-water emulsion, carrying out ultrasonic dispersion on the PDMS-in-water emulsion, and carrying out ultrasonic dispersion on the PDMS-in-water emulsion to obtain the super-hydrophobic radiation cooling porous film. The PDMS film containing water inside can be obtained after vacuum degassing, internal water is removed at high temperature, a micro-nano two-stage porous structure capable of enhancing Mie scattering is formed, and the radiation cooling film with the white matte appearance is prepared. And polishing with abrasive paper to remove the surface skin layer, thereby obtaining the super-hydrophobic radiation cooling porous film material with a rough structure on the surface. The thin film has high sunlight reflectivity, intermediate infrared emissivity and excellent self-cleaning performance, so that the purpose of long-term radiation cooling is achieved.

Description

technical field [0001] The invention belongs to the technical field of functional cooling materials, and relates to a superhydrophobic radiation cooling porous film and a preparation method thereof. Background technique [0002] Cooling buildings or other facilities is an unavoidable need worldwide and accounts for a large percentage of energy consumption. However, traditional compression-based cooling techniques not only consume energy but also damage physical and mental health when used for long periods of time. In addition, there will be environmental problems such as ozone hole, greenhouse effect, and urban heat island effect. In view of this, people need to seek sustainable and more cost-effective cooling methods. [0003] Passive diurnal radiative cooling is an emerging cooling technology, which radiates heat to outer space by reflecting solar radiation, cooling ground objects without external energy input, and without pollutant emissions, significantly reducing trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08J5/18C08J9/28
CPCC08J5/18C08J9/28C08J2383/04C08J2201/0524
Inventor 薛朝华范婷婷黄梦晨
Owner SHAANXI UNIV OF SCI & TECH
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