Preparation method of multistage porous radiation refrigeration film coating

A radiation cooling, thin film technology, applied in coatings, reflective/signal coatings, polyurea/polyurethane coatings, etc., can solve the problems of complex and expensive processing equipment, not suitable for large-scale promotion, etc., and achieve superior performance, raw materials and production. The effect of low cost and simple preparation process

Inactive Publication Date: 2021-02-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, some advanced PDRC designs have attracted widespread attention, but complex and expensive processing equipment is often required in the production process, which is not suitable for large-scale promotion

Method used

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  • Preparation method of multistage porous radiation refrigeration film coating
  • Preparation method of multistage porous radiation refrigeration film coating
  • Preparation method of multistage porous radiation refrigeration film coating

Examples

Experimental program
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Effect test

Embodiment 1

[0034] First, dissolve 2g of hyperbranched polyethoxysilane, 3g of polydimethylsiloxane prepolymer, and 0.3g of curing agent in 4g of toluene, mix well and use it as an oil phase; add 35g of it dropwise to the above oil phase mixture Ionized water, shake slowly for 1 min until the water droplets are evenly dispersed in the oil phase, and then pass through the emulsification of the homogenizer to obtain a high internal phase water-in-oil emulsion. The homogenization speed is 1000 rpm and the homogenization time is 5 min. Transfer the above-mentioned high internal phase water-in-oil emulsion to a sealed Teflon mold, put it in a blower box at 80°C for 12 hours, and obtain a polymerized PDMS / SiO 2 gel. Soak it in absolute ethanol for 6 hours, take it out and dry it in an air blower at 80°C for 6 hours to obtain multi-level porous PDMS / SiO 2 Thin Film Coating for Radiative Cooling (PSHF HP ).

[0035] Such as figure 1 As shown, the prepared PSHF HP The thin-film coating has a ...

Embodiment 2

[0043]The experimental device and operation are the same as in Example 1, 3g polydimethylsiloxane prepolymer is replaced by 4g polyurethane prepolymer, 4g toluene is replaced by 5g tetrahydrofuran; the homogenizer emulsification is replaced by magnetic stirring, and the stirring speed is 1500 rpm, the stirring time was 30 min, and the stirring temperature was 50°C. With other conditions unchanged, the multi-level porous polyurethane / silicon dioxide radiative cooling film coating can be obtained.

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Abstract

The invention relates to a preparation method of a multistage porous radiation refrigeration film coating, which comprises the following steps of: by using a high internal phase water-in-oil emulsionas a template, dissolving organosilane and a polymer prepolymer or monomer in an oil phase, carrying out heating polymerization to form an organic-inorganic composite framework, and drying the framework to obtain the multistage porous radiation refrigeration film coating. According to the invention, large-scale production can be realized without using complex and expensive processing equipment andharsh processing conditions. Due to the rich hierarchical pore structure and excellent optical inherent characteristics of the prepared film coating, sunlight with the wavelength of 0.3-2.5 micrometers can be highly reflected back, heat of the film coating can be dissipated to the cold outer space through an atmospheric transparent window with the wavelength of 8-13 micrometers, and the temperature of the film coating can still be reduced by 5 DEG C or above even under direct sunlight. As a novel refrigeration technology, the method is expected to reduce or replace a traditional electric cooling system, spontaneous cooling of the surface of a building is achieved, and the problem of global climate warming can be effectively relieved.

Description

technical field [0001] The invention belongs to the field of radiation refrigeration, and in particular relates to a preparation method of a multi-stage porous radiation refrigeration film coating. Background technique [0002] With the sharp increase in global energy consumption, more and more research efforts have been devoted to the development of energy-saving technologies. In order to cope with the rapid growth of global air-conditioning power consumption, and to solve the problem that traditional refrigeration technology not only consumes a lot of power, causes "net" temperature rise, but also destroys the ozone layer or brings about a strong greenhouse effect, people have proposed a A passive radiative cooling technology, especially the passive daytime radiative cooling (PDRC) technology, its principle is to reflect back the sunlight with a wavelength range of about 0.3-2.5 μm, and at the same time pass its own heat through a wavelength of 8 The -13 μm atmospheric tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/33C09D183/04C09D175/04C09D7/61
CPCC09D5/004C09D175/04C09D183/04C09D7/61C08K3/36
Inventor 武利民王彤涂书画陈敏
Owner FUDAN UNIV
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