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Super-hydrophobic radiation cooling film and preparation method thereof

A super-hydrophobic and thin-film technology, which is applied in the field of super-hydrophobic radiation cooling film and its preparation, can solve the problems that affect the radiation cooling effect of materials and do not consider the influence of material cooling performance.

Pending Publication Date: 2021-04-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the prepared film has high solar reflectance and mid-infrared emissivity, it does not take into account the impact of outdoor pollution on the cooling performance of the material, such as rain, dust contamination and microbial accumulation, which will affect the solar reflection of the radiation cooling material rate and infrared emissivity, which further affects the radiation cooling effect of materials

Method used

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

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preparation example Construction

[0035] A method for preparing a superhydrophobic radiation cooling film according to the present invention specifically comprises the following steps:

[0036] Step S1: Weigh a certain amount of PVDF powder, dissolve it in acetone / N,N-dimethylformamide mixed solvent, stir at 40°C for 1-2 hours, and obtain a transparent solution A;

[0037] Step S2: Weigh a certain amount of PDMS prepolymer A and curing agent B component (the mass ratio of component A / B is 10:1) and dissolve it in ethyl acetate solvent, stir at room temperature for 0.5-1.5h to obtain clarification Transparent solution B;

[0038] Step S3: Add the clear and transparent solution described in step S2 to the transparent solution described in step S1 dropwise, keep the beaker sealed, and continue to stir at 40°C for 1-2 hours to obtain a micro-emulsion white suspension. The turbid liquid is polyvinylidene fluoride / polydimethylsiloxane (PVDF / PDMS) composite solution;

[0039] Step S4: Add a certain amount of non-so...

Embodiment 1

[0049] step 1

[0050] Weigh 2.0g of PVDF powder, add it into a mixed solvent of 16g ​​of acetone and 4g of N,N-dimethylformamide, stir magnetically at 40°C for 2h to obtain PVDF transparent solution A; then weigh 1.0g of PDMS prepolymer Body A and 0.1 g of curing agent B were added to 10 g of ethyl acetate, and magnetically stirred at room temperature for 0.5 h to form PDMS clear and transparent solution B.

[0051] step 2

[0052] Add the PDMS clear and transparent solution B described in step 1 into the PVDF transparent solution A drop by drop, keep the beaker sealed, and continue stirring at 40°C for 1 hour to obtain a micro-emulsion white suspension, which is the PVDF / PDMS composite solution.

[0053] step 3

[0054] Use a peristaltic pump to control the dropping rate to 0.4 mL / min, and add 2.0 g of non-solvent water dropwise to the micro-emulsion white suspension in step 2 to form a phase-separated sol.

[0055] step 4

[0056] Cast the phase-separated sol solution o...

Embodiment 2

[0059] step 1

[0060] Weigh 2.0g of PVDF powder, add it to 12g of acetone and 8g of N,N-dimethylformamide mixed solvent, stir magnetically at 40°C for 2h to obtain PVDF transparent solution A; then weigh 1.5g of PDMS prepolymer Body A and 0.15g of curing agent B were added to 10g of ethyl acetate, and magnetically stirred at room temperature for 1.5h to form clear and transparent PDMS solution B.

[0061] step 2

[0062] Add the PDMS clear and transparent solution B described in step 1 into the PVDF transparent solution A drop by drop, keep the beaker sealed, and continue to stir at 40°C for 1.5h to obtain a micro-emulsion white suspension, which is the PVDF / PDMS composite solution.

[0063] step 3

[0064] Use a peristaltic pump to control the dropping rate to 0.4 mL / min, and add 2.5 g of non-solvent water dropwise to the micro-emulsion white suspension in step 2 to form a phase-separated sol.

[0065] step 4

[0066] Cast the phase-separated sol solution obtained in ste...

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Abstract

The invention discloses a super-hydrophobic radiation cooling film and a preparation method thereof, and belongs to the technical field of functional cooling materials. The preparation method comprises the following steps: dissolving polyvinylidene fluoride and polydimethylsiloxane in a mixed solvent to form a polyvinylidene fluoride / polydimethylsiloxane composite solution by adopting a non-solvent induced phase separation method; dropwise adding a non-solvent to induce phase separation to form a phase separation sol solution; and casting the phase separation sol solution, and drying to obtain the super-hydrophobic radiation cooling film with the micro-nano double-order porous structure. The preparation method disclosed by the invention is simple, convenient and feasible in process and capable of realizing large-area production, and the super-hydrophobic radiation cooling film disclosed by the invention has high sunlight reflectivity, mid-red emissivity and self-cleaning performance, so that the purpose of radiation cooling is achieved, and the super-hydrophobic radiation cooling film is suitable for outdoor buildings, transportation tools, electronic products, human body heat management and the like. And certain significance is achieved for saving energy and relieving the greenhouse effect.

Description

technical field [0001] The invention belongs to the technical field of functional cooling materials, and relates to a superhydrophobic radiation cooling film and a preparation method thereof. Background technique [0002] With the rapid development of population expansion and modern urban construction, people's demand for building cooling has further increased. However, although traditional electric refrigeration equipment such as air conditioners and fans can achieve a certain degree of cooling, they will consume a lot of energy and will aggravate the greenhouse effect and urban heat island effect. Therefore, a new cooling method with no pollution and no energy consumption is of great significance to alleviate the energy situation and improve environmental problems. [0003] Radiation cooling means that objects on the earth emit their own heat into the cold outer space in the form of thermal radiation through the "atmospheric transparent window" in the 8-13μm band to achie...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/16C08L83/04C08J9/28
CPCC08J5/18C08J9/28C08J2327/16C08J2383/04C08J2427/16C08J2483/04C08J2201/0544
Inventor 薛朝华黄梦晨柳冰莹郭小静
Owner SHAANXI UNIV OF SCI & TECH
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