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A kind of color radiation cooling flexible composite film and its preparation method

A technology of radiation refrigeration and composite film, which is used in rayon manufacturing, textile and papermaking, adding pigments in spinning solution, etc. It can solve the problems of difficult architectural appearance and matching, and achieve good strength and flexibility, and excellent radiation refrigeration effect. Effect

Active Publication Date: 2021-11-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since building cooling consumes a lot of energy, using radiative cooling to cool buildings can effectively alleviate global energy problems. However, in order to achieve high reflection in the visible light region, existing radiative cooling materials are often white, which is difficult to match with the appearance of the building. Therefore, designing a radiative cooling material with a colorful appearance and providing a simple preparation method that can produce radiative cooling devices in a large area at low cost is of great significance to the fields of building cooling and so on.

Method used

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  • A kind of color radiation cooling flexible composite film and its preparation method
  • A kind of color radiation cooling flexible composite film and its preparation method
  • A kind of color radiation cooling flexible composite film and its preparation method

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preparation example Construction

[0033] A method for preparing a color radiation refrigeration flexible composite film, comprising the following steps:

[0034] S1; preparing phase change microcapsules, the phase change microcapsules are core-shell structure microspheres wrapped in paraffin by silica;

[0035] The specific preparation method is: prepare paraffin wax emulsion and cetyltrimethylammonium bromide alkaline solution, stir at 30-50°C for 10-15h, filter and vacuum-dry at 20-30°C to obtain phase-change microcapsules , the diameter of the phase change microcapsule is 0.1-2 μm;

[0036] Wherein, the paraffin wax emulsion is paraffin wax / tetraethyl orthosilicate emulsion, wherein the mass ratio of paraffin wax to tetraethyl orthosilicate is 1:1~3;

[0037] Cetyltrimethylammonium bromide alkaline solution is composed of cetyltrimethylammonium bromide, deionized water, absolute ethanol, ammonia water according to 1.2:100:80:3~1.2:100:80: Mixed with a mass ratio of 5, wherein the concentration of ammonia ...

Embodiment 1

[0045] First prepare phase change microcapsules, put n-octadecane into tetraethyl orthosilicate according to the mass ratio of 1:1, and magnetically stir for 10 minutes to obtain paraffin wax emulsion; then cetyl trimethyl bromide Ammonium chloride, deionized water, absolute ethanol, and 10mol / L ammonia water are mixed according to the mass ratio of 1.2:100:80:5 and magnetically stirred to obtain a cetyltrimethylammonium bromide alkaline solution, and the paraffin is emulsified The solution was slowly added to the cetyltrimethylammonium bromide alkaline solution, stirred magnetically at 40°C for 15 hours, filtered and dried under vacuum at room temperature to obtain phase-change microcapsules;

[0046] Then configure the electrospinning solution, dissolve polyvinylidene fluoride in N,N-dimethylformamide, stir magnetically for 1 h, 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 hy...

Embodiment 2

[0050] First prepare phase change microcapsules, put n-octadecane into tetraethyl orthosilicate according to the mass ratio of 1:1, and magnetically stir for 10 minutes to obtain paraffin wax emulsion; then cetyl trimethyl bromide Ammonium chloride, deionized water, absolute ethanol, and 10mol / L ammonia water are mixed according to the mass ratio of 1.2:100:80:5 and magnetically stirred to obtain a cetyltrimethylammonium bromide alkaline solution, and the paraffin is emulsified The solution was slowly added to the cetyltrimethylammonium bromide alkaline solution, stirred magnetically at 40°C for 15 hours, filtered and dried under vacuum at room temperature to obtain phase-change microcapsules;

[0051] Then configure the electrospinning solution, dissolve polyvinylidene fluoride in N,N-dimethylformamide, stir magnetically for 1 h, 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 hy...

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Abstract

The invention discloses a color radiation cooling flexible composite film and a preparation method thereof. The composite film comprises a high molecular polymer substrate and phase change microcapsules and pigments doped in the high molecular polymer substrate; the high molecular polymer substrate is High polymer / tetraethyl orthosilicate composite fiber, wherein the high polymer is polyvinylidene fluoride, polyvinyl pyrrolidone, polyimide or polydimethylsiloxane, and the diameter of a single fiber is 0.1-1 μm. The preparation method includes: S1: preparing phase-change microcapsules; S2: configuring polymer sol and tetraethyl orthosilicate solution, and mixing pigments and phase-change microcapsules in it to obtain spinning solution, and then electrospinning A color radiation cooling flexible composite film is obtained. The invention simultaneously realizes a color radiation cooling flexible composite film with various colors, radiation cooling, and simple preparation method. The film has good flexibility, high strength, good stability, safety and reliability, and excellent cooling effect, and realizes large-area and low-cost production at the same time.

Description

technical field [0001] The invention belongs to the fields of phase change temperature control and optical temperature control, and in particular relates to a color radiation cooling flexible composite film 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. It can be seen that the energy saving and consumption reduction of air conditioning, as well as the research and development of new methods and new te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D04H1/4382D01F1/04D01F1/10
CPCD01F1/04D01F1/10D04H1/4382D04H1/728
Inventor 周涵李振扬
Owner SHANGHAI JIAO TONG UNIV
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