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Radiation refrigeration composite-photon-structure thin membrane and preparation method thereof

A photonic structure, radiation cooling technology, applied in synthetic fibers, fiber types, textiles and papermaking, etc., can solve the problems of difficult to achieve large-scale production, complicated and expensive coating process, limited popularization and application, etc., to achieve excellent radiation cooling effect, Low angle dependence, low cost effect

Active Publication Date: 2019-12-10
SHANGHAI JIAO TONG 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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  • Radiation refrigeration composite-photon-structure thin membrane and preparation method thereof
  • Radiation refrigeration composite-photon-structure thin membrane and preparation method thereof
  • Radiation refrigeration composite-photon-structure thin membrane and preparation method thereof

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

The invention discloses a radiation refrigeration composite-photon-structure thin membrane and a preparation method thereof. The thin membrane comprises a fiber layer and a microsphere layer from bottom to top. The thin membrane system has the advantages of high sunlight reflection, high infrared radiation, low angle dependence and the like, reflection to energy of sunlight wave bands (0.25-2.5 microns) reaches 97%, the average emissivity in atmospheric window wave bands (8-13 microns) reaches 0.96, the temperature can be reduced by 10 DEG C to the greatest extent under irradiation of 1,000 W / m<2> sunlight, the radiation refrigeration effect is excellent, and the thin membrane has good flexibility and high strength. A simple two-step method is adopted as the preparation method and comprises the steps that the fiber layer is obtained through electrostatic spinning, and the microsphere layer is obtained through deposition of silicon dioxide microsphere dispersion liquid. The thin membrane is simple in structure, efficient in performance, easy to prepare, low in cost, capable of meeting the demand of industrial large-scale production, and high in 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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IPC IPC(8): D06M11/79D06M101/22D06M101/30D06M101/18
CPCD06M11/79D06M2101/18D06M2101/22D06M2101/30
Inventor 周涵王鑫范同祥
Owner SHANGHAI JIAO TONG UNIV
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