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PVA derivative radiation refrigeration film material as well as preparation method and application thereof

A radiative refrigeration and derivative technology, which is applied in refrigerators, refrigeration and liquefaction, climate change adaptation and other directions, can solve the problem that there is no multilayer porous PVA derivative film, and achieves good cooling effect, easy availability of raw materials and low price. Effect

Active Publication Date: 2021-10-22
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no multilayer porous PVA derivative film designed by the solvent-poor solvent phase inversion method and used for solar reflection and infrared radiation materials.

Method used

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  • PVA derivative radiation refrigeration film material as well as preparation method and application thereof
  • PVA derivative radiation refrigeration film material as well as preparation method and application thereof
  • PVA derivative radiation refrigeration film material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Preparation of PVA-C8 film

[0063] (1) Preparation of PVA-C8:

[0064] Take 5.0g of PVA powder in a 250mL round bottom flask, add 200mL of dry dimethyl sulfoxide (DMSO) solution, heat to dissolve at 90°C. The obtained PVA solution was cooled to 60° C., then p-toluenesulfonic acid monohydrate (0.432 g) was added rapidly, and stirred for 1 h. Subsequently, 7.3 mL of octanal was added dropwise to the activated PVA solution, and stirring was continued for 1 h. Pour into saturated sodium bicarbonate solution, stir, and precipitate. Cut the above sediment into pieces, change the water to wash, repeat this process for at least 3 days, and change the water three times a day. Finally, the white powder PVA-C8 was obtained by freeze-drying.

[0065] (2) Preparation of PVA-C8 film:

[0066] PVA-C8 powder was dissolved in N,N-dimethylformamide (DMF) at 90° C. at 15 wt %, and stirred for 7 h to obtain a homogeneous solution with a mass fraction of 15 wt %. The solution was ...

Embodiment 2

[0075] The morphology of PVA-C8 thin film, PVA-C6 thin film and PVB thin film synthesized by phase separation method in embodiment 1 is as follows figure 1 shown. From figure 1 It can be seen that the PVA-C8 film is whiter than the PVA-C6 film and PVB film, indicating that it has the strongest scattering effect on light and is more in line with the requirements of radiation cooling.

[0076] The scanning electron microscope (SEM) observation result of PVA-C8 thin film is as follows figure 2 Shown: It can be seen from the SEM image that there are many holes on the surface of the PVA-C8 film, and the inside is filled with holes of 0.4-3 μm. This structure rich in holes is conducive to light scattering.

Embodiment 3

[0078] Adopt ATR-FTIR spectrometry to measure the absorbance of the PVA-C8 thin film synthesized in embodiment 1, the result is as follows image 3 Shown: It can be seen from the figure that there are absorption peaks at 8-13 mm, mainly -OH association and C-H, C-O and C-O-C stretching vibration peaks, which are just located in the transparent window of the atmosphere, resulting in a strong thermal emissivity of the PVA-C8 film. The high emissivity in the infrared spectrum leads to radiative heat exchange between the polymer film and the atmosphere.

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Abstract

The invention discloses a PVA derivative radiation refrigeration film material as well as a preparation method and application thereof. The preparation method comprises the following steps: synthesizing a PVA derivative modified by alkyl chain side chains with different lengths from polyvinyl alcohol and fatty aldehyde, then dissolving the PVA derivative into a good solvent, and forming a PVA-Cn membrane through a phase separation method, namely the PVA derivative radiation refrigeration membrane material. The PVA derivative radiation refrigeration film material prepared by the invention has rich random micron-pore and nano-pore structures on the surface and inside, has high solar reflectivity and thermal emissivity, and has a good outdoor cooling effect, so that the PVA derivative radiation refrigeration film material can be used as a heat-insulating, solar-reflecting or infrared-transmitting material, and the material is used for radiation refrigeration, building energy conservation, food preservation, wearable products, mobile phones, automobiles, electronics and electric equipment.

Description

technical field [0001] The invention belongs to the field of functional polymer film materials for optical performance control, in particular to a PVA derivative radiation cooling film material and its preparation method and application. Background technique [0002] The greenhouse effect causes global warming, which unfortunately is intensifying, resulting in a significant increase in the global need for cooling. While the climate science community is trying to find effective solutions to address the acceleration of global warming and greenhouse gas emissions, little concrete action has been taken to address climate change. Simply relying on traditional refrigeration systems such as air conditioners and electric fans for active cooling will have a huge impact on global energy consumption and generate additional heat, resulting in the greenhouse effect and urban heat island effect. Therefore, there is an urgent need to develop a new cooling technology that does not consume ...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J5/18C08J3/075C08F8/28C08F16/06F25B23/00C08L29/14
CPCC08J9/28C08J5/18C08J3/075C08F8/28F25B23/003C08J2329/14C08J2201/0484C08F16/06Y02P20/10
Inventor 王吉壮高粱李丹蔡璇徐静宇
Owner JINAN UNIVERSITY
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