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Inverse electrically-controlled light-adjusting film capable of adjusting transmittance rate of near-infrared light and preparation method thereof

A near-infrared light and dimming film technology, applied in optics, nonlinear optics, instruments, etc., can solve the problem of not being able to adjust the transmittance of near-infrared light and visible light at the same time, restricting the adjustment of smart windows, etc. The light transmittance is intelligently controllable and the effect of improving the bond strength

Active Publication Date: 2018-12-07
北京智晶时代科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the solar spectrum, visible light and near-infrared light each account for nearly 50% of the energy, but the current smart windows still cannot have the ability to adjust the transmittance of near-infrared light and visible light at the same time, which restricts the smart window's ability to adjust the solar spectrum radiation. able to adjust

Method used

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  • Inverse electrically-controlled light-adjusting film capable of adjusting transmittance rate of near-infrared light and preparation method thereof
  • Inverse electrically-controlled light-adjusting film capable of adjusting transmittance rate of near-infrared light and preparation method thereof
  • Inverse electrically-controlled light-adjusting film capable of adjusting transmittance rate of near-infrared light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] step one:

[0052] 2.3g vanadium dioxide powder (micron grade, purchased from Alpha ISA, purity 99%) was dispersed in 10g ethanol, 0.45g Disperbyk 180 was added as a dispersant during the dispersion process to stabilize the nanoparticles. Subsequently, the dispersion is stirred using a roller ball mill at a speed of 4200 rpm for a duration of 4 hours to obtain a nano-level vanadium dioxide ethanol dispersion. This dispersion liquid was left to stand for 2 days to remove the precipitates to obtain a stable vanadium dioxide nanoparticle dispersion liquid. The elemental analysis of the above dispersion was carried out by ICP, and the mass fraction of vanadium dioxide was measured to be 15wt.%

[0053] Step two:

[0054] The selected liquid crystals, polymerizable monomers, initiators, and spacer particles are listed in Table 2. The components in Table 2 were mixed according to the ratio, and stirred at room temperature to form an isotropic liquid, and mixed evenly. The total ...

Embodiment 2

[0062] In this embodiment, a toluene dispersion of vanadium dioxide nanoparticles is used, with a mass fraction of 3%. Purchased from Hangzhou Jikang New Material Co., Ltd.

[0063] step one:

[0064] The names of the selected liquid crystals, polymerizable monomers, initiators, and spacer particles are listed in Table 3. The components in Table 2 were mixed according to the ratio, and stirred at room temperature to form an isotropic liquid, and mixed evenly. The total mass of the mixture is 9.6 g.

[0065] Table 3. The ratio of each material used in Example 2

[0066] name

proportion / %

Dual-frequency nematic liquid crystal material

60.2

Polymerizable monomer

38.8

Initiator

0.5

20 micron spacer particles

0.5

[0067] Step two:

[0068] Add 13.3 g of the toluene dispersion of the vanadium dioxide nanoparticles to the mixture in step 1, and ultrasonicate for 10 minutes to make the nanoparticles uniformly dispersed. Subsequently, it was kept at 60° C. under vacuum for 6 hours...

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Abstract

The invention discloses an inverse electrically-controlled light-adjusting film capable of adjusting transmittance rate of near-infrared light. The light-adjusting film comprises a macromolecule network framework, double-frequency nematic-phase liquid crystal molecules and vanadium dioxide nanoparticles. The macromolecule network framework is composed of a polymer dispersed liquid crystal networkstructure and a polymer stabilized liquid crystal network structure. The macromolecule network framework comprises a high-molecular matrix with meshes. The interiors of the meshes are equipped with vertically-arrayed high-molecular networks. The double-frequency nematic-phase liquid crystal molecules are dispersed into the interior of the macromolecule network framework. The vanadium dioxide nanoparticles are dispersed between the framework and the liquid crystal molecules. The invention also discloses the preparation method for the inverse electrically-controlled light-adjusting film. The prepared thin film has an electro-optical characteristic of the inverse electrically-controlled light-adjusting film. Meanwhile, the transmittance rate of near-infrared light can be adjusted in an intelligent manner according to changes in external temperature.

Description

Technical field [0001] The invention belongs to the technical application field of functional liquid crystal materials, and specifically relates to a trans-type electronically controlled dimming film capable of adjusting near-infrared light transmittance and a preparation method thereof. Background technique [0002] Building energy consumption currently accounts for nearly 30% of my country's total energy consumption, ranking first among all types of energy consumption in my country. In summer, the large amount of solar radiant energy entering the room through the windows will cause the indoor temperature to be too high in summer, and the large amount of indoor heat loss through the windows in winter will cause the indoor temperature to be too low in winter. In order to create a comfortable indoor environment, the operation of cooling and heating facilities such as air conditioners and heaters has caused a lot of energy consumption. In order to reduce building energy consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334C08F283/06C08F220/28C08F2/48
CPCC08F2/48C08F283/065G02F1/1334G02F1/13345C08F220/281
Inventor 杨槐梁霄陈梅胡威张兰英
Owner 北京智晶时代科技有限公司
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