CN115368789B - Green vegetation-imitated blade hyperspectral coating and preparation method thereof - Google Patents

Green vegetation-imitated blade hyperspectral coating and preparation method thereof Download PDF

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CN115368789B
CN115368789B CN202210806494.7A CN202210806494A CN115368789B CN 115368789 B CN115368789 B CN 115368789B CN 202210806494 A CN202210806494 A CN 202210806494A CN 115368789 B CN115368789 B CN 115368789B
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coating
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CN115368789A (en
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祖梅
程海峰
许海涛
刘东青
李铭洋
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National University of Defense Technology
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02—Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004—Reflecting paints; Signal paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K2201/011—Nanostructured additives

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Abstract

The invention discloses a hyperspectral coating for a green-like vegetation leaf and a preparation method thereof, wherein the coating comprises MIL-101 (Cr) powder and a film forming agent in parts by mass: 1-5 parts of MIL-101 (Cr) powder; 1-5 parts of film forming agent, wherein the coating has characteristic reflection similar to green vegetation in a visible-near infrared band. The preparation method comprises the following steps: dissolving a film forming agent, adding MIL-101 (Cr) powder material according to mass parts, and stirring to obtain a uniform mixed solution; and curing the mixed solution to form a film to obtain the hyperspectral coating of the green-like vegetation leaf. The vegetation-like leaf spectral coating provided by the invention has high spectral similarity with the natural leaf, and the preparation method is simple, convenient and efficient, and can be used for adhering to the surfaces of walls and various components after being dried through simple casting and curing to form a film.

Description

Green vegetation-imitated blade hyperspectral coating and preparation method thereof
Technical Field
The invention belongs to the field of coating materials, and particularly relates to a hyperspectral coating for a green-like vegetation leaf and a preparation method thereof.
Background
With the rapid development of reconnaissance detection technology, hyperspectral remote sensing detection is used as a novel detection technology based on the combination of a spectrum technology and an imaging technology, and can obtain abundant and detailed spectrum information and image information in the target detection process at the same time, so that huge threats are generated on traditional camouflage. In order to combat hyperspectral detection, the target to be detected needs to be "same-spectrum-like" (mainly 380 nm-2500 nm) as the background. The vegetation environment is taken as one of main ground surface backgrounds, and the development of bionic material research for simulating the spectral reflection characteristics of the vegetation environment has important significance for improving the stealth capability of the target in the vegetation background.
The vegetation-like leaf reflection spectrum coating is studied intensively in recent years, but the problems of different pigment reflection, complex preparation process, higher cost, lower spectrum similarity coefficient and the like generally exist.
Disclosure of Invention
The invention aims to solve the technical problems and overcome the defects in the background art, and provides a hyperspectral coating for a green-like vegetation leaf and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the hyperspectral coating for the green-like vegetation leaf has the reflection characteristic of green vegetation in a visible-near infrared band, and comprises MIL-101 (Cr) powder material and a film forming agent, wherein the MIL-101 (Cr) powder and the film forming agent are prepared from the following components in parts by mass: 1: (0.2-0.6).
1-5 parts of MIL-101 (Cr) powder material; 1-5 parts of film forming agent; 3-7 parts of defoamer and 1-5 parts of water absorbing material.
The vegetation leaf spectrum is mainly affected by chlorophyll, the grating structure in the mesophyll and the moisture in the leaf. Wherein chlorophyll mainly affects the green reflection peak in the blade spectrum, and the barrier structure in mesophyll mainly affects the near infrared high reflection platform of the blade spectrum, and the platform is located in a spectrum interval of 800-1300 nanometers. The moisture in the blade may exhibit distinct spectral reflection valleys around the spectral interval 1490 nm and 1950 nm. The vegetation-like leaf spectrum material mainly simulates the visible-near infrared spectrum reflection characteristics of the leaves.
MIL-101 (Cr) powder material has similar reflection characteristics in the visible-near infrared spectrum, can be used as a coloring filler, and is suitable for simulating the green reflection peak and the near infrared high reflection platform of a natural blade.
Preferably, the MIL-101 (Cr) powder material is in the shape of regular octahedron, and the size distribution is between 200 and 500 nanometers. The porosity of MILs-101 (Cr) powder material can improve the "reflective plateau properties" in the near infrared, such that the spectral coating has similar reflective characteristics to vegetation blades.
Preferably, the hyperspectral coating of the green-like vegetation leaf has the reflection characteristics of green vegetation at a green reflection peak at 487-537nm and a near infrared high reflection platform at 800-1300nm in a visible light region.
Preferably, the film forming agent is polyvinyl alcohol. Polyvinyl alcohol has little absorption in the near infrared and low absorption intensity, and is a preferable film forming agent for the simulated spectrum coating.
Preferably, the water absorbing material is lithium chloride.
Preferably, the mass ratio of MIL-101 (Cr) powder material to film forming agent is 1: (0.2-0.5), wherein the mass ratio of the MIL-101 (Cr) powder material to lithium chloride is 1: (0.05-0.15), wherein the mass ratio of the MIL-101 (Cr) powder material to the defoamer is 1: (0.1-1).
Under the same technical conception, the invention also provides a preparation method of the hyperspectral coating of the simulated green vegetation leaf, which comprises the following steps:
(1) Dissolving a film forming agent, adding MIL-101 (Cr) powder material according to mass parts, and stirring to obtain a uniform mixed solution;
(2) And curing the mixed solution to form a film to obtain the hyperspectral coating of the green-like vegetation leaf.
Preferably, the film forming agent is added into deionized water for stirring and dissolution, and the mass ratio of the film forming agent to the deionized water is 1: (8-10); the stirring temperature is controlled to be 60-90 ℃, and the stirring time is controlled to be 4-5 hours.
Preferably, the MIL-101 (Cr) powder material, the defoamer, the water absorbing material and the film forming agent are mixed and then ball-milled, wherein the ball milling time is 2-5 hours, and the ball milling rotating speed is 300-500r/min.
Compared with the prior art, the invention has the beneficial effects that:
1) The hyperspectral coating of the simulated green vegetation leaf mainly selects coloring filler MIL-101 (Cr) powder with similar reflection characteristics in the visible-near infrared spectrum for simulating a green reflection peak and a near infrared high reflection platform of a natural leaf, the film forming agent polyvinyl alcohol is physically mixed, the lithium chloride which is a strong water absorbing material is added for increasing the water content of the coating, and the defoaming agent is used for improving the surface quality of the coating.
2) The vegetation-like leaf spectral coating provided by the invention has high spectral similarity with the natural leaf, and the preparation method is simple, convenient and efficient, and can be used for adhering to the surfaces of walls and various components after being dried through simple casting and curing to form a film.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of the reflectance spectrum of a natural leaf (scindapsus aureus);
FIG. 2 is a physical view of a spectral coating of a simulated vegetation blade of example 1;
FIG. 3 is a coating reflectance spectrum of example 2;
FIG. 4 is a physical view of a spectral coating of a simulated vegetation blade of example 2;
FIG. 5 is a graph of the reflection of the visible-near infrared spectrum of the coating of example 2;
FIG. 6 is a graph of the reflection of the visible-near infrared spectrum of the coating of comparative example 1;
FIG. 7 is a graph showing transmittance in the ultraviolet-visible-near infrared band measured after film formation of the polyvinyl alcohol of comparative example 2.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown, for the purpose of illustrating the invention, but the scope of the invention is not limited to the specific embodiments shown.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
Example 1:
the preparation method of the hyperspectral coating of the green-like vegetation leaf comprises the following steps:
(1) 10g of film former polyvinyl alcohol was added to a beaker containing 90g of deionized water, and the beaker was placed in an oil bath at 70℃and stirred for dissolution for 3 hours. To prevent water loss in the beaker during dissolution, the beaker needs to be sealed. Taking out the dissolved film forming agent solution, and standing at room temperature for standby;
(2) The film former solution prepared in step (1) was weighed into a 100ml ball milling pot, and 1g of regular octahedral MIL-101 (Cr) powder having a size distribution between 200 and 500nm, 0.05g of lithium chloride, and 0.5g of an antifoaming agent were added, respectively. Fixing a ball milling tank on a working frame of a ball mill, and ball milling for 3 hours at a rotating speed of 400 r/min;
(3) Taking out the mixed paint, casting the paint on a metal aluminum sheet substrate by a solution casting method, and naturally casting to form a film. And then placing the coated aluminum sheet in a blast drying oven for curing, controlling the temperature to be 70 ℃ and the curing time to be 1 hour, thus obtaining the hyperspectral coating of the green-like vegetation leaf.
A physical diagram of the spectral coating of the simulated vegetation blades in the embodiment is shown in FIG. 2.
FIG. 1 is a graph of the reflectance spectrum of a natural leaf (scindapsus aureus); the visible-near infrared spectrum reflection curve of the spectral coating of the simulated vegetation vane in the embodiment is shown in fig. 3, and the graph shows that the spectral reflection curve of the coating has similar reflection characteristics as the vegetation vane, namely, a green reflection peak exists at about 512nm, and a near infrared high reflection platform and a stronger water absorption peak exist at 800-1300 nm.
Equation 1
Figure BDA0003737916480000031
The calculation of the formula 1 shows that the reflectivity of the coating in the visible-near infrared band is 0.8321 which is similar to the spectrum of a natural blade (represented by scindapsus aureus), and the coating has a good spectrum simulation effect.
Example 2
The preparation method of the hyperspectral coating of the green-like vegetation leaf comprises the following steps:
(1) 10g of film former polyvinyl alcohol was added to a beaker containing 90g of deionized water, and the beaker was placed in an oil bath at 70℃and stirred for dissolution for 3 hours. To prevent water loss in the beaker during dissolution, the beaker needs to be sealed. Taking out the dissolved film forming agent solution, and standing at room temperature for standby;
(2) The film former solution prepared in step (1) was weighed into a 100ml ball milling pot, and 1g of regular octahedral MIL-101 (Cr) powder having a size distribution between 200 and 500nm, 0.1g of lithium chloride and 0.5g of an antifoaming agent were added, respectively. Fixing a ball milling tank on a working frame of a ball mill, and ball milling for 3 hours at a rotating speed of 400 r/min;
(3) Taking out the mixed paint, casting the paint on a metal aluminum sheet substrate by a solution casting method, and naturally casting to form a film. And then placing the coated aluminum sheet in a blast drying oven for curing, controlling the temperature to be 70 ℃ and the curing time to be 1 hour, thus obtaining the hyperspectral coating of the green-like vegetation leaf.
The hyperspectral coating of the green-like vegetation leaf has characteristic reflection in the visible-near infrared band.
A physical diagram of the spectral coating of the simulated vegetation blades in this example is shown in FIG. 4.
The visible-near infrared spectrum reflection curve of the spectral coating of the simulated vegetation vane in this embodiment is shown in fig. 5, and it can be seen from the graph that the spectral reflection curve of the coating has similar reflection characteristics as the vegetation vane, namely, a green reflection peak exists, a near infrared high reflection platform and a stronger water absorption peak. The calculation shows that the reflectivity of the coating in the visible-near infrared band is 0.9803 similar to the spectrum of a natural blade (represented by scindapsus aureus), and the coating has a good spectrum simulation effect.
Table 1 shows the spectral similarity coefficients of examples 1 and 2.
TABLE 1
Sample of Example 1 sample Example 2 sample
Spectral similarity coefficient 0.8321 0.9802
Comparative example 1
In this example, the coating was free of lithium chloride and defoamer, and the other conditions were the same as in example 1.
Fig. 6 is a graph showing the reflection of the visible-near infrared spectrum of the coating of this example, which shows that the water content of the coating is low and more and less absorption occurs in the near infrared band of 1300nm-2500nm without adding lithium chloride, which is caused by the absorption of the film forming material, and that the water content of the coating prepared by only MILs-101 (Cr) and polyvinyl alcohol is low, which cannot simulate the water absorption peak of the vegetation leaf in the near infrared band.
The calculation shows that the reflectivity of the coating in the visible-near infrared band is only 0.5601 similar to the spectrum of a natural blade (represented by scindapsus aureus), and the effect of simulating the vegetation spectrum is completely absent.
Comparative example 2
In the comparative example, the coating was prepared using only polyvinyl alcohol, without adding any other material, and was removed after film formation on the aluminum sheet.
The molecular formula of the polyvinyl alcohol is
Figure BDA0003737916480000051
FIG. 7 is a graph showing transmittance in the ultraviolet-visible-near infrared band measured after film formation of polyvinyl alcohol. As can be seen from the graph, after the polyvinyl alcohol is formed into a film, the polyvinyl alcohol resin has small absorption in the ultraviolet band and the band close to 250-280 nm; the light transmittance in the visible light wave band is very high and can reach about 89%, so that the color of the functional filler is ensured to be less influenced by the resin binder; from the test results in the graph, the polyvinyl alcohol resin has lower absorption strength in the near infrared band due to fewer branches.

Claims (6)

1. The hyperspectral coating for the simulated green vegetation leaf blade is characterized in that the coating has the reflection characteristic of green vegetation in a visible-near infrared band, the coating comprises regular octahedron MIL-101 (Cr) powder with the size distribution of 200-500 nanometers and a film forming agent, and the mass part ratio of the MIL-101 (Cr) powder to the film forming agent is as follows: 1: (0.2-0.6);
1-5 parts of MIL-101 (Cr) powder; 1-5 parts of film forming agent, 3-7 parts of defoamer and 1-5 parts of water absorbing material;
the film forming agent is polyvinyl alcohol, and the water absorbing material is lithium chloride.
2. The simulated green vegetation leaf hyperspectral coating of claim 1 wherein the simulated green vegetation leaf hyperspectral coating has the reflective properties of green vegetation at the green reflection peak at 487-537nm and the near infrared high reflection plateau at 800-1300nm in the visible region.
3. The simulated green vegetation leaf hyperspectral coating of claim 1 wherein the MILs-101 (Cr) powder material to film former mass ratio is 1: (0.2-0.5), wherein the mass ratio of the MIL-101 (Cr) powder material to the water absorbing material is 1: (0.05-0.15), wherein the mass ratio of the MIL-101 (Cr) powder material to the defoamer is 1: (0.1-1).
4. A method for preparing the hyperspectral coating of the simulated green vegetation leaf as claimed in any of claims 1 to 3 comprising the steps of:
dissolving a film forming agent, adding MIL-101 (Cr) powder material, a defoaming agent and a water absorbing material according to parts by mass, and stirring to obtain a uniform mixed solution;
and curing the mixed solution to form a film to obtain the hyperspectral coating of the green-like vegetation leaf.
5. The method for preparing the hyperspectral coating of the simulated green vegetation leaf as claimed in claim 4, wherein the film forming agent is added into deionized water for stirring and dissolving, and the mass ratio of the film forming agent to the deionized water is 1: (8-10); the stirring temperature is controlled to be 60-90 ℃, and the stirring time is controlled to be 4-5 hours.
6. The method for preparing the hyperspectral coating of the simulated green vegetation leaf according to claim 4, wherein the MILs-101 (Cr) powder material, the defoamer, the water absorbing material and the film forming agent are mixed and then ball milled, the ball milling time is 2-5 hours, and the ball milling rotating speed is 300-500r/min.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110013879A (en) * 2019-04-29 2019-07-16 西北师范大学 A kind of MIL-101 (Fe) load palygorskite photochemical catalyst and preparation method thereof
CN111978846A (en) * 2020-09-08 2020-11-24 安徽省金盾涂料有限责任公司 Bionic visible light and near infrared detection-resistant camouflage coating composition and preparation method thereof
WO2021076049A1 (en) * 2019-10-17 2021-04-22 National University Of Singapore Composite materials for water capture and release

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WO2009038986A1 (en) * 2007-09-17 2009-03-26 Dow Global Technologies, Inc. Aqueous based coating
CN106751275A (en) * 2016-12-25 2017-05-31 合肥昊泰新材料科技有限责任公司 A kind of organic biomimetic material and preparation method
CN110183700A (en) * 2019-05-30 2019-08-30 中国科学技术大学 The preparation method of silver nanowires flexible and transparent conductive electrode, electrochromic device and preparation method thereof
CN112697770A (en) * 2020-12-10 2021-04-23 广西民族大学 Method for measuring glutaraldehyde in water based on metal organic framework material composite substrate surface enhanced Raman spectroscopy
CN113597032B (en) * 2021-08-10 2022-06-21 北京航空航天大学 Compatible stealth anti-icing material and preparation method and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110013879A (en) * 2019-04-29 2019-07-16 西北师范大学 A kind of MIL-101 (Fe) load palygorskite photochemical catalyst and preparation method thereof
WO2021076049A1 (en) * 2019-10-17 2021-04-22 National University Of Singapore Composite materials for water capture and release
CN111978846A (en) * 2020-09-08 2020-11-24 安徽省金盾涂料有限责任公司 Bionic visible light and near infrared detection-resistant camouflage coating composition and preparation method thereof

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