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Electrochromic material, preparation method thereof, glare-proof rearview mirror for automobiles

An electrochromic material and electrochromic layer technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, vehicle parts, etc. Anti-glare effect, avoid image distortion, good mirror effect

Active Publication Date: 2014-04-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problem that the electrochromic device existing in the prior art has a longer discoloration-fading time and less sensitive response

Method used

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  • Electrochromic material, preparation method thereof, glare-proof rearview mirror for automobiles
  • Electrochromic material, preparation method thereof, glare-proof rearview mirror for automobiles
  • Electrochromic material, preparation method thereof, glare-proof rearview mirror for automobiles

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preparation example Construction

[0030] A method for preparing the above-mentioned electrochromic material, preferably, the first solvent is one of ethanol, ethylene glycol dimethyl ether, DMF, and acetonitrile, and the second solvent is methanol, ether, or tetrahydrofuran. A kind of, said containing ClO 4 - 、PF 6 - , BF 4 - Compounds containing ClO 4 - 、PF 6 - , BF 4 - salt or acid. The first solvent and the second solvent used in the present invention are preferably the above-mentioned low-toxic or non-toxic solvents, which are non-toxic and environmentally friendly compared with cyanide substances commonly used in the synthesis of electrochromic materials at present.

[0031] The contact mode of the contact reaction between the reaction liquid and the halide of R1 is preferably that the reaction liquid is added dropwise into the halide of R1. The heating method of the heating reaction is preferably microwave, which has high heating efficiency and uniform heating. Therefore, the heating time can...

Embodiment 1

[0038] 1) Synthesis of electrochromic materials

[0039] Accurately weigh 1.8g (ie 0.01mol) of phenazine and 0.36g of ethyllithium, add 30mL of ethylene glycol dimethyl ether, reflux for 15min, stir and cool for 0.5h, and drop the reaction solution into 2.36g of 1 , in 4-dibromobenzene, after 30 minutes of dripping, the reaction was continued for 8 hours to obtain 5-(p-bromophenyl)-10-ethyl-5,10-dihydrophenazine solution, which was recrystallized with n-hexane to obtain 2.0 g of yellow needles The powder is 5-(4-bromophenyl)-10-ethyl-5,10-dihydrophenazine.

[0040] Weigh 5-(p-bromophenyl)-10-ethyl-5,10-dihydrophenazine and 4,4-bipyridine in a three-necked flask according to a molar ratio of 2:1, add 25 mL of methanol, and place in a microwave The reaction was carried out by rotation for 15 minutes, and the black solid obtained by rotary evaporation was recrystallized with deionized water to obtain 1.6 g of the electrochromic material A1 of the present invention, with a yield ...

Embodiment 2

[0044] 1) Synthesis of electrochromic materials

[0045] Accurately weigh 1.8g (that is, 0.01mol) of phenazine and 0.22g of methyl lithium, add 30mL of ethylene glycol dimethyl ether, reflux for 15min, stir and cool for 0.5h, and drop the reaction solution into 2.36g of 1 , in 2-diiodoethylene, after 30 minutes, the reaction was continued for 8 hours to obtain 5-(2'-iodovinyl)-10-methyl-5,10-dihydrophenazine solution, which was recrystallized with n-hexane to obtain 2.0g The yellow needle powder is 5-(2'-iodovinyl)-10-methyl-5,10-dihydrophenazine.

[0046] Weigh 5-(2'-iodovinyl)-10-methyl-5,10-dihydrophenazine and 4,4-bipyridine in a three-necked flask according to a molar ratio of 2:1, add 25 mL of ethanol, and Rotate and react in a microwave oven for 13 minutes, filter the reaction product and react with potassium fluoroborate solution with stirring, and recrystallize the solid substance with deionized water to obtain the electrochromic material A2 of the present invention....

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Abstract

The invention provides an electrochromic material and a preparation method thereof. The electrochromic material has a structure formula disclosed in the specification, Y- is halogen ions, ClO4-, PF6- and BF4-; R1 is a group which can form a conjugated bond; R2 is alkyl with the carbon atom number of 1-20 independently; and R3, R4, R5 and R6 are H, alkyl carbon chains with the carbon atom number of 1-4, -OR, -NO2, -X and -CN independently. Cathode and anode chromic materials with certain concentration proportion do not need to be respectively added to the electrochromic material disclosed by the invention, and color change and fading can be quickly realized under power-on and power-off states. The invention also provides a glare-proof rearview mirror for automobiles containing the electrochromic material.

Description

technical field [0001] The invention relates to an electrochromic material, a preparation method thereof, and an anti-glare automobile rearview mirror using the electrochromic material. Background technique [0002] Electrochromism refers to the phenomenon that the optical properties (transmittance or reflectance, etc.) of materials produce stable and reversible changes in the visible light range under the drive of an applied voltage. In appearance, electrochromic materials usually exhibit reversible changes in color and transparency. At present, a variety of products using electrochromic materials have been launched on the market, such as: car rearview mirrors for reducing glare, smart windows that adjust reflection or absorb sunlight according to light changes, etc. [0003] Organic electrochromic materials achieve reversible changes in coloring and decolorization through the redox reaction that occurs. Its advantages are: fast discoloration speed, large viewing angle, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/02C07D401/14B60R1/08
Inventor 谭海荣
Owner BYD CO LTD
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