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

AI Technical Summary

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

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

Examples

Experimental program
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Example Embodiment

[0035]The preparation method of a superhydrophobic radiation cooling film according to the present invention includes the following steps:

[0036]Step S1: Weigh a certain amount of PVDF powder, dissolve in a mixed solvent of acetone / N, N-dimethylformamide, 40 ° C for 1 to 2 h, resulting in a transparent solution A;

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

[0038]Step S3: Putting the clear and clear solution described in step S2 to the transparent solution described in step S1, keep the beaker sealing state, continued to stir at 40 ° C for 1 to 2 h, to obtain a microemulsion white suspension, the resulting microemulsion white Turbid is a polyvinylidene fluoride / polydimethylsiloxane (PVDF / PDMS) composite solution;

[0039]Step S4: In the microemulct white suspensio...

Example Embodiment

[0048]Example 1

[0049]step 1

[0050]2.0 g of PVDF powder was suggested to 16 g of acetone and 4 g of N, N-dimethylformamide mixed solvent, magnetic force at 40 ° C for 2 h, resulting in PVDF transparent solution A; again, 1.0G PDMS prepolymer The body A was added to 0.1 g of curing agent B, and 10 g of ethyl acetate was added, and the magnetic force was stirred at room temperature to form PDMS to clear the transparent solution B.

[0051]Step 2

[0052]The PDMS described in step 1 was evaporated to the transparent solution A of PVDF, and the beaker sealing was held, and stirred at 40 ° C for 1 h, which was obtained as a microemulct white suspension, which is a PVDF / PDMS composite solution.

[0053]Step 3

[0054]The dripping acceleration was controlled using a peristaltic pump, and 2.0 g of non-solvent water was dripped to the microemulct white suspension in step 2 to form a phase separation sol liquid.

[0055]Step 4

[0056]The phase separation sol liquid obtained in step 3 was cast in the surface o...

Example Embodiment

[0058]Example 2

[0059]step 1

[0060]2.0 g of PVDF powder was suggested to 12 g of acetone and 8 g of N, N-dimethylformamide mixed solvent, magnetically stirred at 40 ° C for 2 h, resulting in PVDF transparent solution A; again, 1.5G PDMS prepolymerization The body A was added to 0.15 g of curing agent B, and 10 g of ethyl acetate was added, and the magnetic force was stirred at room temperature to form a PDMS to clear the transparent solution B.

[0061]Step 2

[0062]The PDMS described in step 1 was clearly added to the transparent solution A of the PVDF, and the beaker sealing was held, and stirred at 40 ° C for 1.5 h, and the microemulsion white suspension was obtained, that is, a PVDF / PDMS composite solution.

[0063]Step 3

[0064]The dripping acceleration was controlled using a peristaltic pump, and 2.5 g of non-solvent water was dripped to the microemulct white suspension in step 2 to form a phase separation sol liquid.

[0065]Step 4

[0066]The phase separation sol liquid obtained in step 3 w...

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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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