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Novel electrode material applicable to intelligent liquid crystal dimming film and preparation method thereof

A technology of intelligent dimming and electrode materials, applied in cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems of high manufacturing cost, high price, unaffordable cost of building materials, etc.

Inactive Publication Date: 2016-07-13
江苏天贯碳纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, smart dimming films are still difficult to promote on a large scale in the market, because the ITO transparent conductive electrode material that is the core part of the dimming film still has many problems: 1. Indium, the main component of ITO, is a scarce resource and is expensive. The cost of raw materials is high, and the cost of building materials is difficult to bear; 2. The processing of ITO conductive layers is mostly achieved by sputtering, evaporation and other methods, which not only consumes high energy consumption but also wastes raw materials, so the manufacturing cost of the process is also extremely high; 3. ITO It is an oxide semiconductor material, and its brittleness makes it difficult to realize functions such as bending and folding, hindering its further application in smart window technology; 4. The reflectivity of ITO is relatively high, and it is easy to turn yellow due to light during storage
One of the main reasons is that the CVD method is widely used in the industry to prepare graphene transparent conductive films. Although the cost of raw materials is low, the manufacturing cost is extremely high, so it is difficult to apply it to light-adjusting films.
Invention CN103760722A discloses a light-adjusting film with graphene as an electrode and its preparation method, but because the intelligent light-adjusting film is based on the transparent conductive electrode of graphene prepared by CVD, the high manufacturing cost makes its Difficult to have commercial and practical value

Method used

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  • Novel electrode material applicable to intelligent liquid crystal dimming film and preparation method thereof
  • Novel electrode material applicable to intelligent liquid crystal dimming film and preparation method thereof
  • Novel electrode material applicable to intelligent liquid crystal dimming film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0096] The chemical exfoliation preparation of large-scale graphene oxide flakes with natural graphene as the structural unit, usually the process of preparing graphene by chemical exfoliation is divided into low temperature, medium and high temperature processes.

[0097] (1) Raw material selection:

[0098] Large size requires selection of ≤100 mesh natural flake graphite powder. A more preferred mesh is ≤ 50 mesh.

[0099] (2) Low temperature process:

[0100] Mix 1 part of natural graphite powder, 50-300 parts of concentrated sulfuric acid, 0.5-3 parts of potassium nitrate, and 3-15 parts of potassium permanganate in an ice bath at a temperature ≤ 10°C. 0.5~5h.

[0101] Preferably, 1 part of the quality of natural graphite powder, 100 to 200 parts of the quality of concentrated sulfuric acid, 1 to 2 parts of the quality of potassium nitrate, 5 to 10 parts of the quality of potassium permanganate, in an ice bath at a temperature ≤ 5 ° C, the reaction 0.5~3h.

[0102]...

Embodiment 2

[0115] Preparation of graphene flakes with natural graphene as structural unit by high-speed stirring shear exfoliation

[0116] Mix one part of graphite (50 mesh) with six parts of anhydrous ferric chloride, then put it into the reactor, then vacuumize the reactor, then raise the temperature of the reactor to 380°C, and Keep for 24 hours; then take out the intercalated graphite, wash it with dilute hydrochloric acid, dry it after cleaning, add 50 mass of water and 50 mass of ethanol to the intercalated graphite, and stir at 6000 rpm for 1 hour. After it was filtered and cleaned, it was dissolved in N-methylpyrrolidone, and the obtained graphene was prepared into a 5 ml / mg solution.

Embodiment 3

[0118] Preparation of graphene transparent conductive film from graphene flakes prepared by chemical exfoliation

[0119] (1) Substrate pre-treatment

[0120] A 10 cm*10 cm PET with a thickness of 5 μm was used as the transparent substrate. Put the PET into a 150°C oven and age it for half an hour; then put the PET into O 2 Plasma workstation MarchPX250 processing, set parameters to 150W, 30 seconds, O 2 Air flow: 80sccm, pressure: 350mTorr.

[0121] (2) Coating of adhesive functional layer

[0122] Disperse polymethyl methacrylate (PMMA) in dimethyl ether to prepare a solution with a mass concentration of 5%, apply the above solution on the substrate, and remove the solvent by drying to obtain a polymethacrylate film .

[0123] (3) Coating of graphene flakes.

[0124] Coating speed (m / min) 1.5 3 5 10 25 Thickness (nm) 22.5 10.7 6.5 3.01 1.2 GO / PMMA / PET light transmittance (%) 66.2 71.7 78.4 83.2 88.5

[0125] (4) Optimization of...

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Abstract

The invention relates to a novel electrode material applicable to an intelligent liquid crystal dimming film and a preparation method thereof. A transparent conductive film is at least composed of a substrate and a graphene conductive layer. The transparent conductive film further comprises a functional layer. Graphene sheets are stacked, tiled and connected with one another on a substrate to form the graphene conductive layer. A flexible liquid crystal dimming film device is prepared through the whole wet coating process of the electrodes of a graphene transparent conductive film. The liquid crystal light adjusting layer of the commercialized flexible liquid crystal dimming film is also prepared through the wet coating process. The above two coating processes can be linked up through the roll-to-roll process. Therefore, the preparation of graphene transparent conductive electrodes and the subsequent preparation of the dimming film are ensured to be continuous, low in cost and large-scale in production.

Description

technical field [0001] The invention relates to a graphene transparent electrode material prepared from natural graphene and a preparation method thereof, in particular to an electrode material for an intelligent electroluminescent film device applied to a liquid crystal system and a preparation method thereof. Background technique [0002] Intelligent dimming film is a kind of photoelectric device, which is a device that changes the optical parameters such as light transmittance and haze of the dimming film through the input of electrical signals. It is often used in building exterior walls, real estate decoration, automobile glass, automobile rearview mirrors, projection curtain walls, office spaces, public entertainment facilities and other fields. Taking the most typical application of smart dimming film such as smart windows on buildings as an example, the smart dimming film is combined with architectural glass by pasting, clamping, etc. The incident light intensity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/04H01B13/00
Inventor 赵庆生王丽霞刘腾蛟李丽坤胡源
Owner 江苏天贯碳纳米材料有限公司
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