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A trans-electrically controlled light-adjustable film capable of adjusting near-infrared light transmittance and its preparation method

A technology of near-infrared light and light-adjustable film, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of restricting the adjustment of smart windows and the inability to adjust the transmittance of near-infrared light and visible light at the same time, and achieve the near-infrared film The light transmittance is intelligently controllable and the effect of improving the bonding strength

Active Publication Date: 2021-05-18
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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  • A trans-electrically controlled light-adjustable film capable of adjusting near-infrared light transmittance and its preparation method
  • A trans-electrically controlled light-adjustable film capable of adjusting near-infrared light transmittance and its preparation method
  • A trans-electrically controlled light-adjustable film capable of adjusting near-infrared light transmittance and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0051] step one:

[0052] 2.3g of vanadium dioxide powder (micron size, purchased from Alpha Aisha, with a purity of 99%) was dispersed in 10g of ethanol, and 0.45g of Disperbyk 180 was added as a dispersant during the dispersion process to stabilize the nanoparticles. Subsequently, the above-mentioned dispersion liquid was stirred with a roller ball mill at a rotation speed of 4200 rpm, and a nanoscale vanadium dioxide ethanol dispersion liquid was obtained after a duration of 4 hours. The dispersion liquid was left to stand for 2 days to obtain a stable vanadium dioxide nanoparticle dispersion liquid after removing the precipitate. Utilize ICP to carry out elemental analysis to above-mentioned dispersion liquid, record the massfraction of vanadium dioxide to be 15wt.%.

[0053] Step two:

[0054] The selected liquid crystals, polymerizable monomers, initiators, names and proportions of spacer particles are listed in Table 2. Mix the components in Table 2 according to the ...

Embodiment 2

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

[0063] step one:

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

[0065] Table 3. The proportioning of each material used in embodiment 2

[0066] name Proportion / % Dual frequency nematic liquid crystal material 60.2 polymerizable monomer 38.8 Initiator 0.5 20 micron spaced particles 0.5

[0067] Step two:

[0068] Add 13.3 g of the above-mentioned toluene dispersion of vanadium dioxide nanoparticles to the mixture in step 1, and sonicate for 10 minutes to disperse the nanoparticles evenly. Subsequently, it ...

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Abstract

The invention discloses a trans electronically controlled dimming film capable of adjusting near-infrared light transmittance. The dimming film comprises a polymer network skeleton, dual-frequency nematic liquid crystal molecules and vanadium dioxide nanoparticles. The polymer network skeleton is composed of a polymer-dispersed liquid crystal network structure and a polymer-stabilized liquid crystal network structure. The polymer network skeleton includes a polymer matrix containing mesh holes, and there are vertically arranged polymer networks inside the mesh holes; The dual-frequency nematic phase liquid crystal molecules are dispersed inside the polymer network skeleton; vanadium dioxide nanoparticles are dispersed between the skeleton and the liquid crystal molecules. The invention also discloses a method for preparing the trans electronically controlled dimming film. The film prepared by the invention has the electro-optical characteristics of the trans-type electronically controlled dimming film, and can intelligently adjust the transmittance of near-infrared light according to the change of the external temperature.

Description

technical field [0001] The invention belongs to the technical application field of functional liquid crystal materials, and in particular 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 has accounted for nearly 30% of my country's total energy consumption, ranking first in all kinds of energy consumption in my country. In summer, a large amount of radiant energy of sunlight entering the room through windows will cause the indoor temperature to be too high in summer, while a large amount of indoor heat will be lost through windows in winter, which 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 c...

Claims

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Application Information

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Patent Type & Authority Patents(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