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CN-118638435-B - Chlorophyll copper doped anhydrous guanine crystal plate and preparation method and application thereof

CN118638435BCN 118638435 BCN118638435 BCN 118638435BCN-118638435-B

Abstract

The invention relates to a copper chlorophyll doped anhydrous guanine crystal slice, a preparation method and application thereof, belonging to the field of spectrum stealth and camouflage materials, in particular to a synthesis method of a copper chlorophyll molecular doped guanine crystal. In the invention, copper chlorophyll is used as a functional molecule, organic micromolecular uric acid and a high molecular polymer (P (VP-co-VA)) are used as additives, and the green guanine micron tablet with the optimal refractive index (100) crystal face exposed preferentially is regulated and controlled. The guanine crystal micron sheet prepared by the invention has high reflectivity and specific visible light absorption at 200-2500nm, and simultaneously has the effect of weakening polarized light. Pigment molecules are embedded into crystal lattices to have good effect of stabilizing the chlorophyll copper, so that the pigment is a novel camouflage material with high reflectivity and excellent stability.

Inventors

  • MA YURONG
  • HAO JINGYAN

Assignees

  • 北京理工大学

Dates

Publication Date
20260505
Application Date
20240613

Claims (6)

  1. 1. A copper chlorophyll doped anhydrous guanine micron tablet, characterized in that: The anhydrous guanine microchip is an alpha and beta mixed phase, a high refractive index (100) surface is preferentially exposed, and chlorophyll copper molecules are embedded into crystal lattices of the anhydrous guanine crystal; the anhydrous guanine micron tablet takes industrial anhydrous guanine as a raw material and is prepared according to the following method: Firstly, preparing sodium salt solution of guanine; Secondly, preparing dispersion liquid, wherein the specific method comprises the steps of mixing and dissolving formamide, a high polymer additive, a small polymer additive, water and copper chlorophyll according to a proportion to prepare the dispersion liquid; Thirdly, adding the sodium salt solution of guanine prepared in the first step into the dispersion liquid prepared in the second step, and stirring and fully mixing to obtain a mixed liquid; fourthly, standing the mixed solution obtained in the third step at 60 ℃ for 24 hours to obtain dispersion liquid of the guanine micron sheet crystal doped with chlorophyll copper; And fifthly, performing repeated centrifugal separation-washing processes on the guanine micron tablet dispersion liquid obtained in the fourth step for a plurality of times to obtain the chlorophyll copper doped guanine crystal micron tablet.
  2. 2. A copper chlorophyll doped anhydrous guanine micro tablet according to claim 1, characterized in that: in the first step, the sodium salt solution of guanine is prepared by using industrial anhydrous guanine powder and sodium hydroxide aqueous solution.
  3. 3. A copper chlorophyll doped anhydrous guanine micro tablet according to claim 2, characterized in that: the molar ratio of guanine to sodium hydroxide is 1 (3-5), the concentration of guanine in the obtained solution is 0.05-0.2M, and the concentration of sodium hydroxide is 0.3-0.5M.
  4. 4. A copper chlorophyll doped anhydrous guanine microchip according to any one of claims 1-3, characterized by: In the second step, the high molecular additive is a polymer based on vinyl pyrrolidone, a copolymer (P (VP-co-VA)) of vinyl acetate and N-vinyl pyrrolidone, and the small molecular additive is uric acid.
  5. 5. A copper chlorophyll doped anhydrous guanine micro tablet according to claim 1, characterized in that: In the third step, when the sodium salt solution of guanine is mixed with the dispersion liquid, the proportion of formamide, a small molecular additive, a high molecular additive and copper chlorophyll is 10 (0.1-20): 1-50, and the temperature is RT-60 ℃.
  6. 6. Use of the anhydrous guanine micro tablet doped with copper chlorophyll according to any one of claims 1-5, characterized in that: The obtained anhydrous guanine microchip crystal doped with chlorophyll copper is used as pearlescent pigment to be applied to paint, paint and rubber, and is coated on the surface of military articles and the surface of camouflage net, so that the hyperspectral polarization of green vegetation is simulated to achieve camouflage effect.

Description

Chlorophyll copper doped anhydrous guanine crystal plate and preparation method and application thereof Technical Field The invention relates to a chlorophyll copper doped anhydrous guanine crystal plate, and a preparation method and application thereof, belonging to the field of spectrum camouflage materials. Background The original characteristic information of the object is changed to achieve the effect of hiding the real information of the object, so that effective hiding and camouflage are achieved. However, modern war reconnaissance monitoring technologies such as hyperspectral imaging detection and polarization detection technologies are continuously advancing and developing, and the existing camouflage means are not satisfactory for camouflage in war. With the rapid development of hyperspectral imaging technology, the high-resolution reflection spectrum of an analysis target in a visible-near infrared band (400-2500 nm) is compared with the background, the spectral resolution reaches 5-10 nm, and the method is very widely applied to the military field. In order to realize better camouflage, the camouflage target and the ground object background have spectrum characteristics which are highly similar, so that the development of hyperspectral bionic materials with the same color and the same spectrum as the background has become a research hot spot in the field of optical camouflage. For ground targets, green vegetation is the most widely used background. The method is characterized in that a green camouflage material is designed aiming at a green background of a ground military target, the reflection spectrum of green vegetation is simulated, the hyperspectral imaging technology can be resisted, and the camouflage effect from visible light to infrared light wave bands is realized. The reflection spectrum characteristics of the green vegetation in the 380-780nm visible light region are mainly influenced by chlorophyll molecular orbit absorption, and the unique conjugated large pi system enables the green vegetation to have strong selective absorption to red light (about 680 nm) and blue-violet light (about 330-450 nm) and little absorption to green light, so that the reflection spectrum of the green vegetation shows a green reflection peak at 550 nm. To achieve accurate simulation of the spectral characteristics of green vegetation, the simplest and effective way is to directly use the same coloring "pigment" -chlorophyll as the green leaves. Although many studies based on chlorophyll-like camouflage materials are reported, the problems of instability, easiness in dehydration, poor near infrared reflection hyperspectral consistency and the like are still common phenomena. After leaving the plant, chlorophyll is easily decomposed and loses its green reflection peak under the influence of light, temperature, pH and oxygen. Disclosure of Invention The invention solves the technical problem of overcoming the defects of the prior art and provides a copper chlorophyll doped anhydrous guanine crystal tablet, and a preparation method and application thereof. The technical scheme of the invention is as follows: A copper chlorophyll doped anhydrous guanine crystal flake, the anhydrous guanine crystal being a guanine micron flake exposing a high refractive index (100) face; The preparation method of the guanine comprises the following steps: Preparing a sodium salt solution of guanine by using industrial anhydrous guanine powder and sodium hydroxide, wherein the feeding mole ratio of the guanine to the sodium hydroxide is 1 (3-5), for example, 0.1M (M represents mol/L) guanine is dissolved in 0.4M sodium hydroxide, the concentration of guanine in the obtained solution is 0.05-0.2M, and the concentration of sodium hydroxide is 0.3-0.5M; Preparing a dispersion liquid by using a polymer based on vinyl pyrrolidone, a copolymer (P (VP-co-VA)) of vinyl acetate and N-vinyl pyrrolidone, wherein the small molecular additive adopts uric acid, and the ratio of the formamide, the small molecular additive, the high molecular additive, the water and the copper chlorophyll is 10 (0.1-20): 1-50): 1.5 (1-50); Thirdly, adding the sodium salt solution prepared in the first step into the dispersion liquid prepared in the second step, wherein the volume ratio of the solution to the sodium salt solution is that the dispersion liquid is=1:20, and standing and reacting for 10-12 hours at 40 ℃ after uniformly mixing to obtain the green guanine micron tablet dispersion liquid with bright pearlescence; And fourthly, performing centrifugal separation-washing processes on the dispersion liquid for a plurality of times to obtain anhydrous guanine micron tablet crystals. The application of the anhydrous guanine crystal flakes doped with the copper chlorophyll is that the anhydrous guanine crystal flakes doped with the copper chlorophyll are applied to the surfaces of military trucks, camouflage nets and the like, and the anhydrous guanine crys