CN112126322A - Preparation method of responsive structural color optical variable anti-counterfeiting coating - Google Patents
Preparation method of responsive structural color optical variable anti-counterfeiting coating Download PDFInfo
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- CN112126322A CN112126322A CN202010875739.2A CN202010875739A CN112126322A CN 112126322 A CN112126322 A CN 112126322A CN 202010875739 A CN202010875739 A CN 202010875739A CN 112126322 A CN112126322 A CN 112126322A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 12
- 238000000576 coating method Methods 0.000 title claims abstract description 12
- 230000003287 optical effect Effects 0.000 title abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- 150000001875 compounds Chemical class 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 239000004005 microsphere Substances 0.000 claims abstract description 6
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- 239000000758 substrate Substances 0.000 claims abstract description 6
- 238000003760 magnetic stirring Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000007747 plating Methods 0.000 claims abstract description 3
- 150000004676 glycans Chemical class 0.000 claims description 31
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 11
- 238000000502 dialysis Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000006228 supernatant Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 8
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims description 5
- 235000016425 Arthrospira platensis Nutrition 0.000 claims description 5
- 240000002900 Arthrospira platensis Species 0.000 claims description 5
- 229920001661 Chitosan Polymers 0.000 claims description 5
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 229940045110 chitosan Drugs 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 5
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 5
- 229920001277 pectin Polymers 0.000 claims description 5
- 239000001814 pectin Substances 0.000 claims description 5
- 235000010987 pectin Nutrition 0.000 claims description 5
- 229940082787 spirulina Drugs 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 229940032147 starch Drugs 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 239000012295 chemical reaction liquid Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 4
- 229920000728 polyester Polymers 0.000 abstract description 4
- 230000004044 response Effects 0.000 abstract description 4
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- 238000004040 coloring Methods 0.000 description 1
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- 230000006866 deterioration Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 239000004038 photonic crystal Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
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Classifications
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- 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
- C09D7/66—Additives characterised by particle size
- C09D7/68—Particle size between 100-1000 nm
-
- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Paints Or Removers (AREA)
- Medicinal Preparation (AREA)
Abstract
The invention relates to a preparation method of a responsive structural color optical variable anti-counterfeiting coating, which comprises the following steps: preparing 100ml of SiO with the mass fraction of 10-15% and the diameter of 150-2Adding 0.3-0.8mg of carbon quantum dot powder and 0.1-0.4mg of photochromic polymer into the aqueous dispersion of the microspheres, and fully mixing by magnetic stirring at room temperature for 10-20 minutes to obtain uniformly dispersed dispersion to be sprayed; constructing a structural color pattern on the substrate by using a method of spraying nanoparticles on a mask plate; and then, plating a metal film on the surface of the constructed structural color pattern. According to the invention, the carbon quantum dots are added into the spraying dispersion liquid, so that the obtained anti-counterfeiting coating has a wider color change range and is quicker to recover; the spiropyran is in the cross-linked structure of polyester as color-changing compound, and the unique structure can make spiropyran be affectedThe polyester with relatively stable property protects the color-changing compound from the external environment, the spectral response is more sensitive, and the color-changing effect is good.
Description
Technical Field
The invention relates to a preparation method of a responsive structural color optical variable anti-counterfeiting coating.
Background
The structural color material has unique advantages in many fields, so the structural color material has great application potential in the fields of photon, pigment, fiber 'coloring', sensing, photocatalysis, energy conversion material and the like, and can organically combine the responsiveness of the material and the optical performance of the structural color to obtain various functional photonic crystal structures.
Photochromic refers to that under the action of light with certain wavelength and intensity, the molecular structure of a material is changed along with the change of an absorption spectrum, so that the absorbance and the color of the material are changed. The photochromic compound has the disadvantages of poor light stability, low photochromic response value, insufficient thermal stability and the like, such as: photochromic compounds are susceptible to the influences of pH value, oxidation, illumination intensity, temperature, matrix environment and the like to cause the deterioration of photochemical fatigue, and are degraded and deteriorated after repeated irradiation for many times to lose reversible photochromic performance, or the conditions of prolonged color change response time, reduced chromaticity, delayed fading recovery time and the like are caused.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a method for preparing a responsive structural color optically variable anti-counterfeiting coating layer free from the influence of external environment.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a responsive structural color optically variable anti-counterfeiting coating comprises the following steps: preparing 100ml of SiO with the mass fraction of 10-15% and the diameter of 150-2Adding 0.3-0.8mg of carbon quantum dot powder and 0.1-0.4mg of photochromic polymer into the aqueous dispersion of the microspheres, and fully mixing by magnetic stirring for 10 minutes at room temperature to obtain uniformly dispersed dispersion to be sprayed; constructing a structural color pattern on the substrate by using a method of spraying nanoparticles on a mask plate; and then, plating a metal film on the surface of the constructed structural color pattern.
The preparation method of the carbon quantum dot comprises the following steps: weighing 30-40mg of natural polysaccharide, placing the natural polysaccharide in 50mL of 2% acetic acid aqueous solution, carrying out ultrasonic treatment for 5-10 minutes, fully stirring, then moving the natural polysaccharide to a stainless steel reaction kettle, placing the stainless steel reaction kettle in an oven to react at 220 ℃ for 30 minutes, then taking out the natural polysaccharide, cooling the reaction liquid to room temperature, then pouring the product in the kettle into a beaker, carrying out ultrasonic dispersion for 2 hours, then centrifuging the product in a high-speed centrifuge for three times, taking the supernatant, pouring the supernatant into a dialysis membrane to dialyze in deionized water for 3 days, and carrying out freeze drying for 2 days after dialysis to obtain carbon quantum dot powder.
The natural polysaccharide is at least two of chitosan, hydroxymethyl cellulose, starch, Spirulina polysaccharide, and pectin.
The preparation method of the photochromic polymer comprises the following steps: weighing 20-30g of 2, 2-dimethylolpropionic acid and 18.6-21g of 1,1, 1-trimethylolpropane, adding into a round-bottom flask, mechanically stirring under the protection of N2, heating to 140-155 ℃, adding 0.5-0.8g of p-toluenesulfonic acid as a catalyst, and reacting for 3 hours; adding 3-4g of spiropyran compounds, 3.6-4.5g N and N-methylene bisacrylamide, continuing to react for 1 hour, and cooling to room temperature to obtain the photochromic polymer containing spiropyran.
The metal film is made of NiFe alloy or one or more of Al, Fe, Au and Co, and the thickness of the metal film is 10-20 microns.
Compared with the prior art, the invention has the beneficial effects that:
by adding the carbon quantum dots into the spraying dispersion liquid, the obtained anti-counterfeiting coating has a wider color change range and quicker recovery;
the spiropyran is in a cross-linked structure of the polyester as a color-changing compound, the spiropyran can be protected by the polyester with relatively stable property by the unique structure, the color-changing compound is prevented from being influenced by the external environment, the spectral response is more sensitive, and the color-changing effect is good.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
100ml of SiO with a diameter of 150nm with a mass fraction of 12% were prepared2Adding 0.5mg of carbon quantum dot powder and 0.2mg of photochromic polymer into the aqueous dispersion of the microspheres, and fully mixing the mixture at room temperature for 15 minutes by magnetic stirring to obtain uniformly dispersed dispersion to be sprayed; constructing a structural color pattern on the substrate by using a method of spraying nanoparticles on a mask plate; then, a metal film is plated on the surface of the constructed structural color pattern, and the thickness of the metal film is 15 microns.
The preparation method of the carbon quantum dot comprises the following steps: weighing 30mg of natural polysaccharide, placing the natural polysaccharide in 50mL of 2% acetic acid aqueous solution, carrying out ultrasonic treatment for 8 minutes, fully stirring, transferring the natural polysaccharide to a stainless steel reaction kettle, placing the stainless steel reaction kettle in an oven to react at 220 ℃ for 30 minutes, taking out the natural polysaccharide, cooling the reaction solution to room temperature, pouring the product in the kettle into a beaker, carrying out ultrasonic dispersion for 2 hours, centrifuging the product in a high-speed centrifuge for three times, taking the supernatant, pouring the supernatant into a dialysis membrane to dialyze in deionized water for 3 days, and carrying out freeze drying for 2 days after dialysis to obtain the carbon quantum dot powder.
Specifically, the natural polysaccharide is at least two of chitosan, hydroxymethyl cellulose, starch, Spirulina polysaccharide, and pectin.
Specifically, the metal film is made of NiFe alloy or one or more of Al, Fe, Au and Co.
The preparation method of the photochromic polymer comprises the following steps: weighing 30g of 2, 2-dimethylolpropionic acid and 18.6g of 1,1, 1-trimethylolpropane, adding into a round-bottom flask, mechanically stirring under the protection of N2, heating to 140-155 ℃, adding 0.6g of p-toluenesulfonic acid as a catalyst, and reacting for 3 hours; 4g of spiropyran compound, 3.6g N and N-methylene bisacrylamide are added to continue to react for 1 hour, and the mixture is cooled to room temperature to obtain the photochromic polymer containing spiropyran.
Example 2
100ml of SiO with a diameter of 180nm with a mass fraction of 10% were prepared2Adding 0.8mg of carbon quantum dot powder and 0.1mg of photochromic polymer into the aqueous dispersion of the microspheres, and fully mixing the mixture at room temperature for 10 minutes by magnetic stirring to obtain uniformly dispersed dispersion to be sprayed; constructing a structural color pattern on the substrate by using a method of spraying nanoparticles on a mask plate; then, a metal film is plated on the surface of the constructed structural color pattern, and the thickness of the metal film is 20 microns.
The preparation method of the carbon quantum dot comprises the following steps: weighing 40mg of natural polysaccharide, placing the natural polysaccharide in 50mL of 2% acetic acid aqueous solution, carrying out ultrasonic treatment for 5 minutes, fully stirring, transferring the natural polysaccharide to a stainless steel reaction kettle, placing the stainless steel reaction kettle in an oven to react at 220 ℃ for 30 minutes, taking out the natural polysaccharide, cooling the reaction solution to room temperature, pouring the product in the kettle into a beaker, carrying out ultrasonic dispersion for 2 hours, centrifuging the product in a high-speed centrifuge for three times, taking the supernatant, pouring the supernatant into a dialysis membrane to dialyze in deionized water for 3 days, and carrying out freeze drying for 2 days after dialysis to obtain the carbon quantum dot powder.
Specifically, the natural polysaccharide is at least two of chitosan, hydroxymethyl cellulose, starch, Spirulina polysaccharide, and pectin.
Specifically, the metal film is made of NiFe alloy or one or more of Al, Fe, Au and Co.
The preparation method of the photochromic polymer comprises the following steps: weighing 25g of 2, 2-dimethylolpropionic acid and 21g of 1,1, 1-trimethylolpropane, adding into a round-bottom flask, mechanically stirring under the protection of N2, heating to 140-; adding 3.5g of spiropyran compounds, 4g N, N-methylene bisacrylamide, continuing to react for 1 hour, and cooling to room temperature to obtain the photochromic polymer containing spiropyran.
Example 3
100ml of SiO with a 15% mass fraction and a diameter of 220nm were prepared2Adding 0.3mg of carbon quantum dot powder and 0.4mg of photochromic polymer into the aqueous dispersion of the microspheres, and magnetically stirring for 20 minutes at room temperature to fully mix to obtain uniformly dispersed dispersion to be sprayed; constructing a structural color pattern on the substrate by using a method of spraying nanoparticles on a mask plate; then, a metal film is plated on the surface of the constructed structural color pattern, and the thickness of the metal film is 10 microns.
The preparation method of the carbon quantum dot comprises the following steps: weighing 35mg of natural polysaccharide, placing the natural polysaccharide in 50mL of 2% acetic acid aqueous solution, carrying out ultrasonic treatment for 10 minutes, fully stirring, transferring the natural polysaccharide to a stainless steel reaction kettle, placing the stainless steel reaction kettle in an oven to react at 220 ℃ for 30 minutes, taking out the natural polysaccharide, cooling the reaction solution to room temperature, pouring the product in the kettle into a beaker, carrying out ultrasonic dispersion for 2 hours, centrifuging the product in a high-speed centrifuge for three times, taking the supernatant, pouring the supernatant into a dialysis membrane to dialyze in deionized water for 3 days, and carrying out freeze drying for 2 days after dialysis to obtain the carbon quantum dot powder.
The preparation method of the photochromic polymer comprises the following steps: weighing 20g of 2, 2-dimethylolpropionic acid and 19.5g of 1,1, 1-trimethylolpropane, adding into a round-bottom flask, mechanically stirring under the protection of N2, heating to 140-155 ℃, adding 0.5g of p-toluenesulfonic acid as a catalyst, and reacting for 3 hours; adding 3g of spiropyran compound, 4.5g N and N-methylene bisacrylamide, continuing to react for 1 hour, and cooling to room temperature to obtain the photochromic polymer containing spiropyran.
Specifically, the natural polysaccharide is at least two of chitosan, hydroxymethyl cellulose, starch, Spirulina polysaccharide, and pectin.
Specifically, the metal film is made of NiFe alloy or one or more of Al, Fe, Au and Co.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A preparation method of a responsive structural color optically variable anti-counterfeiting coating is characterized by comprising the following steps: preparing 100ml of SiO with the mass fraction of 10-15% and the diameter of 150-2Adding 0.3-0.8mg of carbon quantum dot powder and 0.1-0.4mg of photochromic polymer into the aqueous dispersion of the microspheres, and fully mixing by magnetic stirring at room temperature for 10-20 minutes to obtain uniformly dispersed dispersion to be sprayed; constructing a structural color pattern on the substrate by using a method of spraying nanoparticles on a mask plate; and plating a metal film on the surface of the constructed structural color pattern.
2. The preparation method of the responsive structural color optically variable anti-counterfeiting coating according to claim 1, characterized in that the preparation method of the carbon quantum dots comprises the following steps: weighing 30-40mg of natural polysaccharide, placing the natural polysaccharide in 50mL of 2% acetic acid aqueous solution, carrying out ultrasonic treatment for 5-10 minutes, fully stirring, then moving the natural polysaccharide to a stainless steel reaction kettle, placing the stainless steel reaction kettle in an oven to react at 220 ℃ for 30 minutes, then taking out the natural polysaccharide, cooling the reaction liquid to room temperature, then pouring the product in the kettle into a beaker, carrying out ultrasonic dispersion for 2 hours, then centrifuging the product in a high-speed centrifuge for three times, taking the supernatant, pouring the supernatant into a dialysis membrane to dialyze in deionized water for 3 days, and carrying out freeze drying for 2 days after dialysis to obtain carbon quantum dot powder.
3. The method for preparing the responsive structural color optically variable anti-counterfeiting coating according to claim 2, wherein the natural polysaccharide is at least two of chitosan, hydroxymethyl cellulose, starch, spirulina polysaccharide, polysaccharide and pectin.
4. The method for preparing the responsive structural color optically variable security coating according to claim 1, wherein the method for preparing the photochromic polymer comprises: weighing 20-30g of 2, 2-dimethylolpropionic acid and 18.6-21g of 1,1, 1-trimethylolpropane, adding into a round-bottom flask, mechanically stirring under the protection of N2, heating to 140-155 ℃, adding 0.5-0.8g of p-toluenesulfonic acid as a catalyst, and reacting for 3 hours; adding 3-4g of spiropyran compounds, 3.6-4.5g N and N-methylene bisacrylamide, continuing to react for 1 hour, and cooling to room temperature to obtain the photochromic polymer containing spiropyran.
5. The method for preparing the responsive structural color optically variable anti-counterfeiting coating according to claim 1, wherein a NiFe alloy or one or more of Al, Fe, Au and Co is adopted as a metal film, and the thickness of the metal film is 10-20 micrometers.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115491912A (en) * | 2022-09-30 | 2022-12-20 | 福建省谷鸿新材料科技有限公司 | Fluorescent anti-counterfeiting structural yarn dyed fabric and preparation method thereof |
| CN116554868A (en) * | 2023-05-06 | 2023-08-08 | 浙江理工大学 | Metal-organic framework loaded spiropyran photochromic dual-color material and preparation method thereof |
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