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Porous polydimethylsiloxane with daytime radiation refrigeration function, and preparation method thereof

A dimethylsiloxane, radiative cooling technology for sustainable manufacturing/processing, sustainable construction, climate sustainability, etc.

Active Publication Date: 2021-07-06
HANGZHOU INNOVATION RES INST OF BEIJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the existing preparation schemes can directly obtain a PDMS-based diurnal radiative cooler that maintains high emissivity in the atmospheric transparent window and has minimal absorption in the solar spectrum range.

Method used

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  • Porous polydimethylsiloxane with daytime radiation refrigeration function, and preparation method thereof
  • Porous polydimethylsiloxane with daytime radiation refrigeration function, and preparation method thereof
  • Porous polydimethylsiloxane with daytime radiation refrigeration function, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides a preparation method of porous polydimethylsiloxane with daytime radiation refrigeration, comprising the following steps:

[0035] (1) Synthesis of micron NaCl porogen:

[0036] Add 5ml, 3M NaCl solution (solvent is water) dropwise to 100ml of absolute ethanol under stirring condition, stir for 10min, stop stirring, after standing for 1min, pour off the supernatant, and use a centrifuge to centrifuge , collect the white precipitate; wash the white precipitate with absolute ethanol, centrifuge with a centrifuge to collect the precipitate, put the precipitate in a vacuum drying oven at 100°C for 12 hours and take it out, grind it to powder with agate smoke wave, A micron-sized NaCl porogen with a particle size of 7.5 μm was obtained;

[0037] (2) Weigh 10g of Dow Corning PDMS (Dow Corning 184A) and 2g of Dow Corning curing agent (Dow Corning 184B), and mix thoroughly to obtain a PDMS mixture; take 5g of the PDMS mixture and 5g of the micron mixtu...

Embodiment 2

[0041] This embodiment provides a preparation method of porous polydimethylsiloxane with daytime radiation refrigeration, comprising the following steps:

[0042] (1) Synthesis of micron NaCl porogen:

[0043] Add 5ml, 3M NaCl solution (solvent is water) dropwise to 100ml of absolute ethanol under stirring condition, stir for 10min, stop stirring, after standing for 1min, pour off the supernatant, and use a centrifuge to centrifuge , collect the white precipitate; wash the white precipitate with absolute ethanol, centrifuge with a centrifuge to collect the precipitate, put the precipitate in a vacuum drying oven at 100°C for 12 hours and take it out, grind it to powder with agate smoke wave, A micron-sized NaCl porogen with a particle size of 7.5 μm was obtained;

[0044] (2) Weigh 10g of Dow Corning PDMS (Dow Corning 184A) and 2g of Dow Corning curing agent (Dow Corning 184B), and mix thoroughly to obtain a PDMS mixture; take 1g of the PDMS mixture and 6g of the micron mixtu...

Embodiment 3

[0047] This embodiment provides a preparation method of porous polydimethylsiloxane with daytime radiation refrigeration, comprising the following steps:

[0048] (1) Synthesis of micron NaCl porogen:

[0049] Add 5ml, 3M NaCl solution (solvent is water) drop by drop into 100ml absolute ethanol under stirring condition, stir for 10min, stop stirring, after standing for 1min, pour off the supernatant, and use centrifuge to centrifuge, Collect the white precipitate; wash the white precipitate with absolute ethanol, centrifuge it with a centrifuge, collect the precipitate, put the precipitate in a vacuum drying oven at 100°C for 12 hours, take it out, grind it to powder with agate smoke wave, and then A micron-sized NaCl porogen with a particle size of 7.1 μm was obtained;

[0050] (2) Weigh 10g of Dow Corning PDMS (Dow Corning 184A) and 2g of Dow Corning curing agent (Dow Corning 184B), and mix thoroughly to obtain a PDMS mixture; take 2g of the PDMS mixture and 10g of the micr...

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Abstract

The invention relates to a preparation method of porous polydimethylsiloxane with a daytime radiation refrigeration function. The method comprises the following steps: firstly synthesizing a micron-sized NaCl pore-foaming agent, and controlling the distribution and size of pores in the synthesized porous PDMS by controlling the size and dosage of the micron-sized NaCl pore-foaming agent to realize daytime radiation refrigeration of the porous PDMS without additional conditions. According to pores in the porous polydimethylsiloxane, on one hand, the mid-infrared emissivity (compared with nonporous PDMS) of PDMS is improved, light of a solar spectrum band is scattered, and on the other hand, air in the pores isolates heat exchange between a heat dissipation object and the surrounding environment. The synergistic thermo-optic effect ensures the excellent radiation refrigeration effect of the porous PDMS film; according to the method, the preparation process is simple, the cost is low, and batch preparation can be realized; and no extra metal or polymer reflecting layer needs to be added in the whole preparation process, and 95% of solar radiation can be reflected by utilizing the pore structure of the porous PDMS.

Description

technical field [0001] The invention belongs to the technical field of radiation cooling materials, and in particular relates to a porous polydimethylsiloxane with daytime radiation cooling and a preparation method thereof. Background technique [0002] Due to global warming, industrial development, population growth and improvement in people's living standards, the energy demand for refrigeration and air conditioning is increasing dramatically. According to statistics, the energy required for air conditioning cooling is expected to increase more than 30 times between 2000 and 2100. However, traditional air-conditioning and refrigeration methods usually consume a large amount of energy, and high energy consumption will directly cause excessive emissions of greenhouse gases and seriously damage the climate balance. Radiant refrigeration technology provides a new energy-saving and environmentally friendly cooling method for solving the internal cooling of high-energy-consumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08L83/04
CPCC08J9/26C08J2201/0446C08J2383/04Y02P20/10
Inventor 邓元翁杨紫菀赵未昀姜一
Owner HANGZHOU INNOVATION RES INST OF BEIJING UNIV OF AERONAUTICS & ASTRONAUTICS
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