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A kind of radiative cooling composite photonic structure thin film and its preparation method

A technology of photon structure and radiation refrigeration, which is applied in the fields of synthetic fiber, fiber processing, textiles and papermaking, etc., can solve the problems of complex and expensive coating process, difficulty in large-scale production, and limited popularization and application, and achieve excellent radiation refrigeration effect, Low Angle Dependency, Inexpensive Effects

Active Publication Date: 2021-04-02
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these coating processes are complicated and expensive, and it is difficult to achieve large-scale production, which seriously limits their application in the market

Method used

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  • A kind of radiative cooling composite photonic structure thin film and its preparation method
  • A kind of radiative cooling composite photonic structure thin film and its preparation method
  • A kind of radiative cooling composite photonic structure thin film and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] First configure the electrospinning solution, dissolve polyvinylidene fluoride in N,N-dimethylformamide, stir it magnetically for 1 hour, prepare a polyvinylidene fluoride sol with a mass fraction of 3% for use, and then add orthosilicic acid Tetraethyl ester, ethanol, and 0.01mol / L hydrochloric acid were mixed in a volume ratio of 10:10:1.6 and magnetically stirred to obtain a tetraethyl orthosilicate solution, and the prepared polyvinylidene fluoride sol and tetraethyl orthosilicate solution Mix at a volume ratio of 8:1, stir magnetically in a water bath at 40°C for 1 hour, and configure it as an electrospinning solution; set the positive spinning voltage to 20KV, negative voltage to -1KV, and the spinning solution flow rate to 1mL / L to pass through the electrostatic spinning method. A polyvinylidene fluoride / tetraethyl orthosilicate mixture fiber layer was obtained. Add silica microspheres with an average diameter of about 10 μm to ethanol to prepare a 1 mg / mL disper...

Embodiment 2

[0030]First configure the electrospinning solution, dissolve polyvinylidene fluoride in N,N-dimethylformamide, stir it magnetically for 1 hour, prepare a polyvinylidene fluoride sol with a mass fraction of 3% for use, and then add orthosilicic acid Tetraethyl ester, ethanol, and 0.1mol / L hydrochloric acid were mixed at a volume ratio of 10:10:3 and magnetically stirred evenly to obtain tetraethyl orthosilicate solution, and the prepared polyvinylidene fluoride sol and tetraethyl orthosilicate solution Mix at a volume ratio of 8:1, stir magnetically in a water bath at 60°C for 1 hour, and prepare an electrospinning solution; set the positive spinning voltage to 20KV, negative voltage to -1KV, and the flow rate of the spinning solution to 2mL / L to pass through the electrospinning method. A polyvinylidene fluoride / tetraethyl orthosilicate mixture fiber layer was obtained. Add silicon dioxide microspheres with an average diameter of about 10 μm to ethanol to prepare a 1 mg / mL disp...

Embodiment 3

[0033] First configure the electrospinning solution, dissolve polyvinylpyrrolidone in N,N-dimethylformamide, stir it magnetically for 1 hour, prepare a polyvinylpyrrolidone sol with a mass fraction of 3% for use, and then dissolve tetraethylorthosilicate Esters, ethanol, and 0.01mol / L hydrochloric acid were mixed with a volume ratio of 8:8:3 and magnetically stirred to obtain a tetraethyl orthosilicate solution, and the prepared polyvinylpyrrolidone sol and tetraethyl orthosilicate solution were mixed at a ratio of 2: Mix at a volume ratio of 1, stir magnetically in a water bath at 70°C for 1 hour, and prepare an electrospinning solution; set a positive spinning voltage of 20KV, a negative voltage of -1KV, and a spinning solution flow rate of 1mL / L to obtain polyethylene by electrospinning Pyrrolidone / tetraethylorthosilicate mixture fibrous layer. Add silicon dioxide microspheres with an average diameter of about 10 μm to ethanol to prepare a 1 mg / mL dispersion, and ultrasonic...

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Abstract

Disclosed are a radiation refrigeration film with a composite photon structure, and a preparation method therefor, wherein the film comprises, from bottom to top, a fiber layer and a microsphere layer. The film system has the characteristics of strong sunlight reflection, high infrared radiation, a low angle dependence, etc. The reflection of energy in the sunlight band (0.25-2.5 μm) by same is up to 97%, and the average emissivity in the atmospheric window band (8-13 μm) is up to 0.96. The film can achieve a temperature drop of up to 10ºC under sunlight of 1000 W / m2, has an excellent radiation refrigeration effect and good flexibility and strength. The preparation method is a simple two-step method, comprising performing electrostatic spinning to obtain the fiber layer, and depositing a silicon dioxide microsphere dispersion to obtain the microsphere layer. The film has a simple structure and a high performance, the preparation thereof is simple and easy, and same is low cost, can meet the demands of industrial scale production, and has a high potential application value.

Description

technical field [0001] The invention relates to the technical field of photon structure and optical temperature control, in particular to a radiation refrigeration compound photon structure film material and a preparation method thereof. Background technique [0002] With the development of society and the continuous improvement of people's living standards, the demand for space cooling in hot summer is also increasing. However, traditional cooling methods (such as air conditioners, electric fans) need to consume a lot of energy. According to the estimates of the International Energy Agency, electricity consumption for cooling has accounted for 10% of the world's total electricity consumption, and it is as high as 50% during the summer cooling peak period, and the value is still increasing year by year. Enormous pressure. Moreover, since most countries including my country mainly rely on thermal power generation, the increased demand for electricity will cause environmenta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/79D06M101/22D06M101/30D06M101/18
CPCD06M11/79D06M2101/18D06M2101/22D06M2101/30
Inventor 周涵王鑫范同祥
Owner SHANGHAI JIAOTONG UNIV
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