CN113606995B - Color-changing film for hyperspectral stealth camouflage - Google Patents

Color-changing film for hyperspectral stealth camouflage Download PDF

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CN113606995B
CN113606995B CN202110915133.1A CN202110915133A CN113606995B CN 113606995 B CN113606995 B CN 113606995B CN 202110915133 A CN202110915133 A CN 202110915133A CN 113606995 B CN113606995 B CN 113606995B
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color
changing
film
hyperspectral
viologen
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CN113606995A (en
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贾春阳
柳翔瀚
翁小龙
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
    • F41H3/02—Flexible, e.g. fabric covers, e.g. screens, nets characterised by their material or structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/404—Multi-coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)

Abstract

A color-changing film for hyperspectral stealth camouflage belongs to the technical field of hyperspectral stealth camouflage. The color-changing film comprises an upper electrode layer, a color-changing layer and a lower electrode layer which are arranged in sequence, wherein the color-changing layer comprises: 50 to 90 weight percent of water, 5 to 20 weight percent of sol, 0.5 to 10 weight percent of chrome green, 0.25 to 10 weight percent of viologen and derivatives thereof, 0.1 to 2 weight percent of salt, 0.2 to 4 weight percent of cross-linking agent and 0.5 to 10 weight percent of infrared adjusting filler. The color-changing film can change the color and the near-infrared reflectivity according to different applied voltages, thereby realizing camouflage under hyperspectral detection and adapting to a continuously changing ground environment.

Description

Color-changing film for hyperspectral stealth camouflage
Technical Field
The invention belongs to the technical field of hyperspectral stealth camouflage, and particularly relates to a color-changing film for hyperspectral stealth camouflage.
Background
In modern wars, technologies such as command, control, communication, damage, detection and the like are highly integrated, and the phenomenon of being discovered, namely being destroyed is gradually formed. The satellite hyperspectral technology can easily display the target different from the background environment by analyzing and processing hyperspectral data of the target and referring to a spectrum database of the background, so that the traditional camouflage means cannot provide sufficient protection. The hyperspectral detection technology is a precise optical detection technology, and mainly reduces the bandwidth of a spectral channel and improves the detection resolution ratio through the principles of grating light splitting, acousto-optic tunable filtering light splitting and the like. Due to the existence of the infrared atmospheric window, the hyperspectral detection aiming at the green vegetation background is mainly concentrated at two positions of all visible light wave bands (350-750 nm) and near infrared wave bands (750-2500 nm), and the detection precision can reach 10 nm. This detection technique can identify either different colors or differences of the same color. Specifically, the traditional camouflage material can achieve the purpose of being fused with a background environment visually, but compared with the imaging result of the traditional camouflage material under hyperspectral detection, the fine reflection spectra of the traditional camouflage material and the imaging result of the traditional camouflage material within 350-2500 nm are obviously different (namely the same color and different spectra). This difference will result in the target being exposed to a reconnaissance by an enemy. Common ground backgrounds at present include green vegetation backgrounds, soil backgrounds and the like. The spectral characteristics of green vegetation mainly come from plant leaves, and the fine reflection spectrum of the green vegetation comprises the following characteristics (as shown in figure 1): the first reflection peak at 550nm has the intensity of 8-15%, and the reflection peak comes from the color of vegetation; secondly, the intensity of the near-infrared reflection plateau in the range of 850-1150 nm is 50-60%, and the reflection plateau is generated by a unique pore structure in the plant leaves; thirdly, the intensities of absorption peaks at 1400nm and 1800nm are respectively 15-25% and 5-10%, and the absorption peaks are absorption peaks generated by water in plant leaves; the intensity of a reflecting platform between absorption peaks at the fourth, 1400nm and 1800nm is different according to different plant species; the soil has no obvious spectral characteristics under natural conditions, the reflection curve has less obvious peaks and valleys, but in areas with dense vegetation, the soil has lower reflectivity due to high water content and high organic content (as shown in figure 1), and the soil also has dark brown and black colors. In order to realize stealth camouflage under hyperspectral detection, a novel camouflage technology capable of fully simulating vegetation fine spectrum is urgently needed, and the novel camouflage technology needs to comprise three reflection characteristics of the plant leaves; meanwhile, the vegetation (green) and the soil (black) need to be changed so as to meet the requirement of blending into the constantly changing ground environment.
At present, the color matching agent is widely applied to camouflage nets, camouflage paint and the like of ground targets, can only provide colors similar to background vegetation for the targets, and cannot be matched with fine spectrums of the background vegetation in hyperspectral detection, so that the phenomenon of 'same color and different spectrums' is caused. This is because the camouflage net, camouflage paint and the like which are commonly used at present do not have the tissue structure and the composition characteristics of natural vegetation, and the displayed fine spectrum has great difference with the real characteristics of green vegetation. Aiming at the current situation, the structures, components and the like of camouflage nets and camouflage coatings are improved at home and abroad, and bionic materials with the same reflection spectrum as green vegetation are developed. However, these bionic materials have the problem of being "homochromatically identical to" a single vegetation environment, and cannot adapt to complex changes of the surrounding environment in the process of ground movement, so that the target is exposed. At present, the subject group has a color-variable bionic leaf technology, the green-yellow conversion of leaves can be simulated by an electrochromic principle, but the color conversion of the technology is only limited in a visible light area, an effective modulation effect is lacked for detection under a wave band of 800-2500 nm, and the adjustment and the variation in the whole range of hyperspectral detection cannot be realized, so that the environment is subjected to harsh requirements in the camouflage process, and the wide requirements cannot be well met.
Disclosure of Invention
The invention aims to provide a color-changing film for hyperspectral stealth camouflage aiming at the defects in the background technology, wherein the color-changing film can change the color and the near-infrared reflectivity according to different external voltages, so that the camouflage under hyperspectral detection is realized, and the color-changing film is suitable for a continuously changing ground environment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a color-changing membrane for stealthy camouflage of high spectrum which characterized in that, color-changing membrane is including the last electrode layer, discoloration layer and the lower electrode layer that set gradually, wherein, discoloration layer is for "the bionical aquogel that discolours of" integration "that collects bionical discoloration, electrolyte, ion storage function, the bionical aquogel that discolours of integration composition includes: 50 to 90 weight percent of water, 5 to 20 weight percent of sol, 0.5 to 10 weight percent of chrome green, 0.25 to 10 weight percent of viologen and derivatives thereof, 0.1 to 2 weight percent of salt, 0.2 to 4 weight percent of cross-linking agent and 0.5 to 10 weight percent of infrared adjusting filler; the mass ratio of the chromium green to the viologen and the derivatives thereof is (1-10): 1.
further, the sol is polyvinyl alcohol or polymethyl methacrylate or the like; the viologen and the derivatives thereof have color change from colorless to purple, colorless to black, light yellow to purple, or light yellow to black, and have modulation function of near infrared band (light wavelength is above 780 nm) (the near infrared modulation function is changed between near infrared transparency and near infrared high absorption rate), including but not limited to methyl viologen, 2,4, 6-tri (4-pyridine) 1,3, 5-triazine, 4' - (3, 4-ethylenedioxythiophene-2, 5-diyl) bis (1-octylpyridinium), carbazole modified viologen compounds and the like; the salt can reduce the color-changing voltage of the viologen and the derivative thereof, and increase the reaction speed thereof, in particular to one or more of ferrocene, potassium ferricyanide or potassium ferrocyanide; the cross-linking agent is borax, sodium sulfate, zinc sulfate or L-malic acid, etc.; the infrared adjusting filler is silicon dioxide, titanium dioxide and the like.
Further, the mass ratio of the chromium green to the infrared adjusting filler is (1-3): 1.
Furthermore, the color-changing membrane can be in a shape of a circle, a triangle, a quadrangle, a polygon or other two-dimensional plane shapes with non-hollow interiors, and the area of the color-changing membrane is 5-100 cm2。
Furthermore, the color-changing layer is prepared by coating or rolling the integrated bionic color-changing hydrogel on the lower electrode layer by a rod. And then taking the other electrode layer as an upper electrode layer, placing the upper electrode layer on the color changing layer, and sealing the color changing layer between the upper electrode layer and the lower electrode layer by adopting adhesives such as adhesive tapes, light-sensitive adhesives, phenolic resins and the like to obtain the color changing film for hyperspectral camouflage.
Further, the preparation process of the integrated bionic color-changing hydrogel specifically comprises the following steps: firstly, mixing sol and deionized water, stirring for 3-5 hours in an oil bath at the temperature of 80-90 ℃, standing at room temperature after stirring is finished so as to cool and defoam to obtain hydrogel; and then, sequentially adding chromium green, viologen and derivatives thereof, salt, a cross-linking agent and an infrared adjusting filler into the hydrogel obtained in the previous step, and stirring the mixture by using a stirring rod to be in a uniform state to obtain the integrated bionic color-changing hydrogel. In the integrated bionic color-changing hydrogel, the contents of all components are as follows: 50 to 90 weight percent of water, 5 to 20 weight percent of sol, 0.5 to 10 weight percent of chrome green, 0.25 to 10 weight percent of viologen and derivatives thereof, 0.1 to 2 weight percent of salt, 0.2 to 4 weight percent of cross-linking agent and 0.5 to 10 weight percent of infrared adjusting filler; the mass ratio of the chromium green to the viologen and the derivatives thereof is (1-10): 1. the sol is polyvinyl alcohol or polymethyl methacrylate and the like; the viologen and the derivatives thereof have color change from colorless to purple, colorless to black, light yellow to purple, or light yellow to black, and have modulation function of near infrared band (light wavelength is above 780 nm) (the near infrared modulation function is changed between near infrared transparency and near infrared high absorption rate), including but not limited to methyl viologen, 2,4, 6-tri (4-pyridine) 1,3, 5-triazine, 4' - (3, 4-ethylenedioxythiophene-2, 5-diyl) bis (1-octylpyridinium), carbazole modified viologen compounds and the like; the salt is one or more of ferrocene, potassium ferricyanide or potassium ferrocyanide; the cross-linking agent is borax, sodium sulfate, zinc sulfate or L-malic acid, etc.; the infrared adjusting filler is silicon dioxide, titanium dioxide and the like.
Further, the process of preparing the color-changing layer by the rod coating method comprises the following steps: and placing the prepared integrated bionic color-changing hydrogel on one surface of the conductive layer of the lower electrode layer, and uniformly coating the hydrogel on the conductive layer by using a glass rod, an iron rod, a plastic rod and the like to form a color-changing layer. The process of preparing the color changing layer by the rolling method comprises the following steps: and uniformly pressing the prepared integrated bionic color-changing hydrogel on one surface of the conductive layer of the lower electrode layer through a calender to form a color-changing layer.
Preferably, the upper electrode layer and the lower electrode layer comprise a transparent substrate and a conductive film formed on the transparent substrate by electron beam evaporation or magnetron sputtering, and the upper electrode layer and the lower electrode layer can provide a conductive path for the color-changing layerAnd can also be used as a shell to provide protection for the color changing layer. The transparent substrate is glass, a PET film, a PE film and the like, and the thickness of the transparent substrate is 0.1-2 mm; the conductive film is fluorine-doped tin oxide (FTO), Indium Tin Oxide (ITO) and the like, the thickness is 100-1000 nm, and the sheet resistance is 50-200 omega sq-1. In the prior art, an FTO film and an ITO film with the thickness of 100-1000 nm are used as an electrode layer of a conducting layer, the electrode layer is in a high-transparency state at a waveband of 400-1200 nm of optical wavelength, and the light transmittance at the waveband of 1200-2500 nm of optical wavelength can be reduced to 40-60%, but the failure of the film at the section can not be caused.
When no voltage is applied, the viologen and the derivative thereof are in a colorless state and a light yellow state (can be completely covered by the green of chromium green), the whole color-changing film is in a transparent state in a near-infrared band, the color-changing layer of the whole color-changing film visually presents the green provided by the chromium green, and the near-infrared transparent color-changing material cannot influence the spectral characteristics of green vegetation under high-spectrum detection such as near-infrared plateau, water characteristic peak and the like provided by the chromium green, water and the like, and at the moment, the film can simulate the reflection spectrum of ground green vegetation; when coloring voltage of the viologen and the derivative thereof is applied, the viologen and the derivative thereof are purple or black, and the state of absorbing light is presented in a near infrared band, at the moment, the color of the color-changing layer is black visually, and the film can imitate the reflection spectrum of ground humus-rich and moist soil (dark brown and black) (as shown in figure 3).
Further, as shown in fig. 3, the principle of the color-changing layer simulating the fine reflection spectrum of the vegetation specifically is as follows:
(1) aiming at the reflection peak of green leaves at 550nm, the color-changing film is realized by chromium green in a color-changing layer. Preferably, in order to control the reflectivity of the discoloring layer at 550nm to be 8-15%, the chrome green accounts for 0.5-10 wt% of the total components. In addition, the fine reflection spectrum of the ground black soil at the place is obtained after applying coloring voltage of viologen and derivatives thereof to the color changing layer.
(2) Aiming at plant leaves
In the near-infrared reflection plateau within the range of 850-1150 nm, the color-changing film is realized by chromium green in a color-changing layer. Preferably, in order to control the reflectivity of the color changing layer within the range of 850-1150 nm within 50-60%, the chrome green accounts for 0.5-10 wt% of the total components.
(3) The color-changing film is realized by water in the color-changing layer and the water absorption effect of the sol and the cross-linking agent aiming at the water absorption peaks of the plant leaves at 1400nm and 1800 nm. Meanwhile, the sealing of the electrode layer to the color changing layer can also protect water in the color changing layer from losing. Wherein the gel network in the color changing layer can hold a certain amount of water.
(4) Aiming at the difference of different green vegetation on the reflection spectrum, the strength difference of a reflection platform between water absorption peaks at 1400-1800 nm is mainly reflected, and the color-changing film is realized by chromium green and infrared adjusting filler in a color-changing layer. Preferably, in order to control the reflection intensity of the discoloring layer at 1400-1800 nm to be 20-45%, the chromium green accounts for 0.5-10 wt% of the total components, the infrared adjusting filler accounts for 0.5-10 wt% of the total components, the mass ratio of the chromium green to the infrared adjusting filler is (1-3): 1, and the higher the ratio of the chromium green is, the higher the reflection intensity of the reflection platform at the position is.
(5) Aiming at the difference of ground green vegetation and ground humus-rich and moist soil in reflection spectrum, the color-changing film is simulated by coloring and fading of viologen and derivatives thereof in a color-changing layer. When coloring voltage of the viologen and the derivatives thereof is applied, the material in the color-changing layer is in a dark state such as purple, black and the like and is in a light absorption state in a near-infrared waveband, the color-changing layer is in a green and purple mixed color, namely black, in vision, the reflectivity of the near-infrared spectrum is low, the light absorption effect of the viologen and the derivatives thereof covers the characteristic of vegetation in the 800-2500 nm waveband, namely a near-infrared plateau and two water peaks, and the film can simulate the reflection spectrum of ground humus and moist soil; when voltage is not applied, the viologen and the derivatives thereof in the color-changing layer are colorless and light yellow and are in a transparent state in a near-infrared waveband, the color-changing layer is in a color mixture of colorless, light yellow and green in vision, namely green, the viologen and the derivatives thereof cannot influence the reflection spectrum characteristics of the 800-2500 nm waveband provided by other materials such as chrome green and the like in a system, and the film can simulate the reflection spectrum of ground green vegetation.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional camouflage color, the color-changing film for hyperspectral stealth camouflage provided by the invention fully simulates the fine reflection spectrum of vegetation and has the hyperspectral detectability which is not possessed by the traditional camouflage color;
compared with the novel hyperspectral camouflage color, the color-changing film for hyperspectral camouflage can be switched between green color required for simulating ground green vegetation and black color required for simulating humus-rich and moist soil which is not covered by planting according to the environment, has higher flexibility, and can meet the requirement of complex environment background.
Compared with the existing variable color 'bionic leaf' technology, the environment color selected by the color-changing film for hyperspectral stealth camouflage provided by the invention has stronger practicability in a local vegetation area, the regulation and control range of the color-changing film under hyperspectral detection can be expanded from a visible light area to a main wave band of hyperspectral detection, namely 800-2500 nm, and especially the visible spectrum characteristics of near infrared plateau, water absorption peak and the like of vegetation can be camouflaged by selecting viologen and derivatives thereof as a color-changing material.
Drawings
FIG. 1 is a fine reflection spectrum of a simulated green vegetation background and a deep color soil background rich in humus and water in a color-changing film for hyperspectral camouflage;
FIG. 2 is a schematic structural diagram of a color-changing film for hyperspectral stealth camouflage provided by the invention;
fig. 3 is a comparison between a color-changing film for hyperspectral camouflage and a simulated vegetation spectrum and soil spectrum in the use process of the color-changing film for hyperspectral camouflage according to embodiment 1 of the invention.
Detailed Description
The technical scheme of the invention is detailed below by combining the accompanying drawings and the embodiment.
Example 1
A color-changing film for hyperspectral camouflage comprises the following specific preparation processes:
step 1, preparation of upper and lower electrode layers:
two flexible ITO films with the size of 5cm multiplied by 5cm and taking a PET film as a substrate are cut, and are subjected to ultrasonic cleaning by sequentially using ethanol, deionized water and ethanol. The surface was then blown dry with compressed air. Putting into a closed box for taking.
Step 2, preparing a color-changing layer:
2.1 preparation of the crosslinking agent
10ml of deionized water was taken in a beaker, and L-malic acid was slowly poured thereinto while stirring with a glass rod until the dissolution of L-malic acid in water was saturated. The application method comprises collecting the supernatant with dropper.
2.2 preparation of biomimetic allochroic hydrogel
Weighing 4g of PVA (polyvinyl alcohol) powder, adding the PVA powder into 25ml of deionized water, stirring and reacting for 4h at 85 ℃ in an oil bath, taking out the PVA powder after the reaction is finished, standing the PVA powder at room temperature so as to cool and defoam the PVA powder to obtain PVA hydrogel; then, 0.2g of chromium green, 0.1g of methyl viologen, 0.015g of potassium ferricyanide, 0.015g of potassium ferrocyanide and 0.15g of titanium dioxide are sequentially added into the mixture, 1ml of the cross-linking agent prepared in the step 2.1 is dropwise added into the mixture by using a dropper, and the mixture is uniformly stirred by using a glass rod, so that the integrated bionic color-changing hydrogel can be obtained.
2.3 preparation of the color-changing layer
And (3) taking one electrode layer obtained in the step (1) as a lower electrode layer, and attaching double-sided adhesive tape to the edge of the periphery of the conductive surface. And a certain blank for connecting with the lead needs to be reserved when the double-sided adhesive tape is pasted. And (3) placing a plurality of integrated bionic color-changing hydrogel obtained in the step 2.2 in a rectangular area formed by the double-sided adhesive tape, flattening and uniformly pressing the hydrogel by using a glass rod to ensure that the thickness of the color-changing layer is basically equal to that of the double-sided adhesive tape, and filling the area surrounded by the double-sided adhesive tape into the area which does not exceed the area.
Step 3, packaging the color-changing film:
and (3) taking an electrode layer obtained in the step (1) as an upper electrode layer, and covering the upper electrode layer on the color-changing layer obtained in the step (2). The conductive surface of the upper electrode layer faces the color changing layer. And pressing the edges of the upper and lower electrode layers with force to make the upper and lower electrode layers fully bonded. And then, completely sealing the edges of the film by using a transparent adhesive tape to obtain the color-changing film.
Example 2
A color-changing film for hyperspectral stealth camouflage is prepared by the following specific steps:
step 1, preparation of upper and lower electrode layers:
two flexible ITO films with the size of 4cm multiplied by 6cm and taking a PET film as a substrate are cut, and are subjected to ultrasonic cleaning by sequentially using ethanol, deionized water and ethanol. The surface was then blown dry with compressed air. Putting into a closed box for taking.
Step 2, preparing a color-changing layer:
2.1 preparation of the crosslinking agent
10ml of deionized water was taken in a beaker, and borax was slowly poured into the beaker while stirring with a glass rod until the borax was saturated in the water. The application method comprises collecting the supernatant with dropper.
2.2 preparation of biomimetic allochroic hydrogel
Weighing 4g of PVA (polyvinyl alcohol) powder, adding the PVA powder into 25ml of deionized water, stirring and reacting for 4h at 85 ℃ in an oil bath, taking out the PVA powder after the reaction is finished, standing the PVA powder at room temperature so as to cool and defoam the PVA powder to obtain PVA hydrogel; then, 0.2g of chromium green, 0.1g of carbazole modified viologen compound, 0.02g of ferrocene and 0.15g of titanium dioxide are sequentially added into the hydrogel, then 1ml of the cross-linking agent obtained in the step 2.1 is dripped into the hydrogel by using a dropper, and the mixture is uniformly stirred by using a glass rod, so that the integrated bionic color-changing hydrogel can be obtained.
2.3 preparation of the color-changing layer
And (3) taking one electrode layer obtained in the step (1) as a lower electrode layer, placing a plurality of the integrated bionic color-changing hydrogel obtained in the step (2.2) on the lower electrode layer, and flattening and uniformly pressing the integrated bionic color-changing hydrogel by using a glass rod. If the hydrogel does not cover the surface of the electrode layer, repeatedly taking, flattening and uniformly pressing the integrated bionic color-changing hydrogel for many times; if the hydrogel covers the surface of the electrode layer, scraping the redundant part by using a scraper;
step 3, packaging the color-changing film:
and (3) taking an electrode layer obtained in the step (1) as an upper electrode layer, and covering the upper electrode layer on the color-changing layer obtained in the step (2). The conductive surface of the upper electrode layer faces the color changing layer. After the upper electrode layer is flattened and compacted, a proper amount of photosensitive adhesive is continuously dripped between the edges of the upper conductive layer and the lower conductive layer by a burette, and a small blank for connecting with a lead needs to be reserved on the conductive surfaces of the two electrode layers during dripping. The film was irradiated using a hand-held uv analyzer to cure the edge of the photoresist. And obtaining the color-changing film.
The discoloration film obtained in example 1 was subjected to a test, and the results are shown in fig. 3. When no voltage is applied to the film, the film is visually green, the spectrum effect is the curve of the color changing camouflage film (green state) in figure 3, and the spectrum curve is similar to the spectrum curve of the green vegetation in figure 1, so that the camouflage of the simulated green vegetation is realized; when voltage is applied to the film, the film is visually black, the spectrum effect is the curve of the discoloring camouflage film (dark state) in figure 3, and the curve is similar to the curve of a soil spectrum in figure 1, so that the soil imitation camouflage is realized.

Claims (7)

1. The utility model provides a color-changing membrane for stealthy camouflage of high spectrum which characterized in that, color-changing membrane is including the last electrode layer, color-changing layer and the lower electrode layer that set gradually, wherein, color-changing layer includes: 50-90 wt% of water, 5-20 wt% of sol, 0.5-10 wt% of chromium green, 0.25-10 wt% of viologen derivative, 0.1-2 wt% of salt, 0.2-4 wt% of cross-linking agent and 0.5-10 wt% of infrared adjusting filler; the weight ratio of the chrome green to the viologen derivatives is (1-10): 1, the salt is ferrocene or potassium ferrocyanide, the cross-linking agent is borax or L-malic acid, the sol is polyvinyl alcohol, and the infrared adjusting filler is titanium dioxide.
2. The color-changing film for hyperspectral camouflage according to claim 1, wherein the derivative of viologen has a color change from colorless to purple, colorless to black, pale yellow to purple, or pale yellow to black, and has a near-infrared band modulation function.
3. The color-changing film for hyperspectral camouflage according to claim 1, wherein the derivative of viologen is methyl viologen or 2,4, 6-tris (4-pyridine) 1,3, 5-triazine or 4, 4' - (3, 4-ethylenedioxythiophene-2, 5-diyl) bis (1-octylpyridinium) or carbazole modified viologen compound.
4. The color-changing film for hyperspectral camouflage according to claim 1, wherein the mass ratio of the chromium green to the infrared adjusting filler is (1-3): 1.
5. The color-changing film for hyperspectral camouflage according to claim 1, wherein the color-changing layer is prepared by preparing an integrated bionic color-changing hydrogel on the lower electrode layer by a rod coating or calendaring method.
6. The color-changing membrane for hyperspectral stealth camouflage according to claim 5, wherein the preparation process of the integrated bionic color-changing hydrogel specifically comprises the following steps: firstly, mixing sol and deionized water, and stirring for 3-5 hours in an oil bath at the temperature of 80-90 ℃ to obtain hydrogel; and then, sequentially adding chromium green, viologen derivatives, salt, a cross-linking agent and an infrared adjusting filler into the obtained hydrogel, and uniformly stirring to obtain the integrated bionic color-changing hydrogel.
7. The color-changing film for hyperspectral camouflage according to claim 1, wherein the upper electrode layer and the lower electrode layer comprise a transparent substrate and a conductive film formed on the transparent substrate by an electron beam evaporation method or a magnetron sputtering method; the transparent substrate is glass, a PET film or a PE film, and the thickness of the film is 0.1-2 mm; the conductive film is fluorine-doped tin oxide or indium tin oxide, the thickness is 100-1000 nm, and the sheet resistance is 50-200 omega sq-1。
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