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Single-layer double-sided asymmetric porous radiation cooling film as well as preparation method and application thereof

An asymmetric, double-sided technology, applied in the field of passive cooling materials, can solve the problems of increased weight, high cost, complex operation process of support structure and high requirements, and achieve the effect of high solar reflectance, high and middle infrared radiation rate

Active Publication Date: 2020-09-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, patents CN110305539A, CN208821312U, CN110103559A and CN108641155A respectively introduce a preparation method and application of a radiation cooling material. Although they have a certain radiation cooling effect, they all require a layered construction process, and the multilayer structure It will increase its weight, there will be higher requirements for building the support structure and the operation process is complex and demanding, the radiation cooling effect is limited and the cost is high; there is also the function of painting the outer wall of the building to cool down, and the cooling effect is general

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  • Single-layer double-sided asymmetric porous radiation cooling film as well as preparation method and application thereof

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preparation example Construction

[0029] The invention provides a method for preparing a single-layer double-sided asymmetric porous radiation cooling film. A non-solvent-induced phase separation method is used to obtain a cellulose acetate porous polymer substrate material with a micron-scale pore structure. The directional enrichment of the micron oxide particles is adjusted on one side of the cellulose acetate porous polymer base material, and a single-layer double-sided asymmetric porous radiation cooling film is prepared.

[0030] Specifically include the following steps:

[0031] Step 1, configure acetone / water solution, acetone / N,N-dimethylacetamide solution, tetrahydrofuran / water solution or tetrahydrofuran / N,N-dimethylacetamide solution in a beaker, and stir at a speed of 100rpm to 1000rpm to make The solution is mixed evenly to obtain a dissolved solution;

[0032] Step 2, weighing an appropriate amount of cellulose acetate powder, adding it to the dissolved solution in step 1, and continuing to sti...

Embodiment 1

[0044] Weigh the reagents according to the stoichiometric ratio: 60mL of acetone, 5mL of distilled water, and stir at a speed of 400rpm by magnetic stirring to make the solution evenly mixed; Stir at a high speed for 4 hours to obtain a clear and transparent solution; add 0.5 g of silicon dioxide powder with a particle size of 8 μm to the clear and transparent solution, and continue stirring for 4 hours to obtain a milky white suspension; pour the milky white solution into a glass petri dish with a diameter of 10 cm. Naturally volatilized and dried in a fume hood for 12 hours to obtain a white single-layer double-sided asymmetric porous radiation cooling film.

[0045] Such as figure 1 As shown, the radiation cooling film material prepared in this example can achieve a good cooling effect: the solar reflectance of the film in the 0.3-2.5 micron band is as high as 0.96, and the mid-infrared radiation rate in the 8-13 micron atmospheric window band is as high as 0.95; Compared ...

Embodiment 2

[0047] Weigh the reagents according to the stoichiometric ratio: 100mL of acetone, 30mL of N,N-dimethylacetamide, and stir at a speed of 1000rpm by magnetic stirring to mix the solution evenly; then weigh 8g of cellulose acetate powder, add the above In the acetone / N,N-dimethylacetamide solution, continue to stir at a speed of 1000rpm for 10h to obtain a clear and transparent solution; add 2.4g of magnesium oxide powder with a particle size of 8μm to the clear and transparent solution, and continue to stir for 10h to obtain a milky white suspension solution; the milky white solution was poured into a glass petri dish with a diameter of 10 cm, and was naturally volatilized and dried in a fume hood for 24 hours to obtain a white single-layer double-sided asymmetric porous radiation cooling film.

[0048] The radiation cooling film material prepared in this embodiment can achieve a good cooling effect: the solar reflectance of the film in the 0.3-2.5 micron band is as high as 0.93...

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Abstract

The invention provides a preparation method of a single-layer double-sided asymmetric porous radiation cooling film. A cellulose acetate porous polymer substrate material with a micron-scale hole structure is obtained by adopting a non-solvent induced phase separation method; meanwhile, spectrum-adjusted micron oxide particles are directionally enriched on a single surface of the cellulose acetateporous polymer substrate material by adopting a gravity self-deposition method, so that the single-layer double-surface asymmetric porous radiation cooling film is prepared. The invention also provides the single-layer double-sided asymmetric porous radiation cooling film and application thereof. The single-layer double-sided asymmetric porous radiation cooling film has the advantages of higher sunlight reflectivity and intermediate infrared radiance, simple preparation process and the like, is suitable for large-scale low-cost manufacturing, and can be independently self-supported.

Description

technical field [0001] The invention belongs to the field of passive cooling materials, and in particular relates to a single-layer double-sided asymmetric porous radiation cooling film, a preparation method and an application thereof. Background technique [0002] Building energy consumption accounts for about 20% to 40% of the total energy consumption in developing countries. Among them, the energy consumed to maintain the temperature inside buildings accounts for a large proportion of building energy consumption. If the air conditioner is used to adjust the indoor temperature and the cooling temperature is increased by 2°C, the cooling load will be reduced by about 20%. Therefore, if a new type of cooling material is used to cool the building without consuming additional energy, the energy consumption of the building can be greatly reduced. [0003] Radiation cooling refers to the process in which functional materials transmit heat to outer space through the "atmospheric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/12C08K3/36C08K3/22C08J5/18
CPCC08J5/18C08K2201/003C08K3/36C08K2003/222C08K2003/221C08J2301/02
Inventor 相波
Owner NANJING FORESTRY UNIV
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