CN115232514B - Water-contacting color-developing structural color material and preparation method thereof - Google Patents
Water-contacting color-developing structural color material and preparation method thereof Download PDFInfo
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- CN115232514B CN115232514B CN202210860073.2A CN202210860073A CN115232514B CN 115232514 B CN115232514 B CN 115232514B CN 202210860073 A CN202210860073 A CN 202210860073A CN 115232514 B CN115232514 B CN 115232514B
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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
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
Abstract
The invention provides a water-contacting color development structural color material and a preparation method thereof. The material of the invention has simple preparation process, low cost and environmental protection; the material can realize the public optical anti-counterfeiting which is difficult to copy, can be industrialized into anti-counterfeiting means for packaging industrial and commercial products with special encryption requirements for editing anti-counterfeiting patterns. The anti-counterfeiting ink has important application value and wide application prospect in the fields of polymer coating industry, special optical anti-counterfeiting ink industry and the like, and can endow new generation paper money with anti-counterfeiting characteristics of preventing color copying, thereby promoting the benign development of high-added-value industry chains.
Description
Technical Field
The invention relates to the technical field of special optical anti-counterfeiting ink, in particular to a water-contacting color-developing structural color material and a preparation method thereof.
Background
The optical anti-counterfeiting technology is a key support technology for commodity identification, modern paper money and other economic transactions, and plays an extremely important role in protecting high-added-value commodities and constructing economic informatization. The conventional optical anti-counterfeiting technology adopts heat-sensitive and fluorescent ink and the like, which have the problems of easy imitation of anti-counterfeiting marks, low technical means identification degree and threshold and the like, so that innovation of the anti-counterfeiting technology is urgently needed. Although the theoretical research results of the optical anti-counterfeiting at home and abroad are rich, the technical and cost problems of practical application are still unsolved up to now. The specificity of the anti-counterfeiting field also determines that the technical threshold is low and the related technology with a large amount of open literature cannot be widely applied.
Patent CN110484078A discloses a water-soluble transparent coating and a preparation method thereof, and the prepared coating has good water-soluble transparent characteristics, but the coating itself does not have adjustable color, and needs to be covered on the upper layer of a chemical pigment substance as a coating layer, and the color of the following substances can be displayed after the water-soluble transparent coating is changed, so that the application in the fields of coating, pigment, printing ink and the like is limited.
Therefore, the construction of the colored environment-friendly ink with wettability and capability of showing intrinsic structural color when meeting water has important application value for special optical anti-counterfeiting ink and industries based on the application.
Disclosure of Invention
The invention aims to provide a water-contacting color-developing structural color material and a preparation method thereof. Based on the preparation technology with controllable morphology, refractive index and size of submicron-sized colloid microspheres, on the basis of systematically exploring the preparation technology and optical characteristics of the colloid microspheres, the optical scattering phenomenon of the microsphere with controllable morphology and size is utilized to perfect the microsphere functional application and the ink compounding technology, the influence of parameters such as microsphere structure, compounding proportion, polymer organization structure and the like on the characteristics of an optical anti-counterfeiting system is researched, and finally the water-meeting color development structural color materials with different colors are regulated and obtained. The physical structure color is continuously adjustable, the application range is wide, and the special optical anti-counterfeiting ink is low in production cost.
The invention aims to provide a water-contacting color-developing structural color material and a preparation method thereof.
The invention also aims to provide the structural color ink capable of developing color when meeting water, which is prepared by the preparation method.
The above object of the present invention is achieved by the following technical scheme:
the invention provides a preparation method of a water-meeting color development structural color material, which comprises the steps of uniformly mixing submicron colloid microspheres and black light absorption substances, adding white micron scatterers, and fully dispersing to obtain the water-meeting color development structural color material.
According to the invention, a polymer emulsion system with low cost is designed, submicron colloid microspheres are mixed with white micron scatterers, so that the stacking order of the submicron colloid microspheres is destroyed to generate physical structural colors without angle dependence, the structural color saturation is enhanced by black light absorbing substances, and the emulsion is compounded, so that the environment-friendly printing ink with low cost and adjustable color (the continuous adjustable physical structural colors are used for replacing heavy metal pigment substances, and the environment-friendly printing ink comprises various colors, pure white and semitransparent colors) and color development when meeting water is constructed.
Preferably, the submicron-sized microspheres have an average diameter of 100 to 300nm.
Preferably, the submicron-sized microspheres are any one of silica, titania, polystyrene, polymethyl methacrylate.
Preferably, the white micron-sized scatterer is any one of mesoporous silica, titanium dioxide and diatomite.
Preferably, the black light absorbing substance is any one of carbon black, carbon nanotubes, graphene and polydopamine.
Preferably, the mass ratio of the submicron colloid microspheres, the black light absorbing substances and the white micron scatterers is 1:0.001-0.01:0.5-2.
The invention also provides the water-meeting color development structural color material obtained by the preparation method.
The structural color of the water-meeting color-developing structural color material prepared by the invention is mainly controlled by microsphere particle size, and the color development mechanism is mainly controlled by white micron-sized scatterers. The microsphere system with different structural colors can be obtained by selecting microspheres with different particle diameters and controlling the surface morphology, and the microsphere system and the white micron-sized scatterer with the refractive index change when meeting water form composite ink, so that the microsphere system has a great application prospect in the special optical anti-counterfeiting ink industry.
The invention also provides a method for preparing a coating by the water-meeting color-developing structural color material prepared by the method, which comprises the following steps: and wiping the substrate, drying, spraying or coating the material on the surface of the substrate, and drying to obtain the coating.
The inventor obtains the integrity of the microsphere surface morphology of the water-color-developing structural color material through a great deal of research and exploration, and the uniformity of the white micron-sized scatterer after mixing can influence the color developing effect of the material, so that the preparation key of ensuring the integrity of the microsphere surface morphology of the composite material and the overall uniformity of the material is as follows: controlling the particle size of the colloidal microspheres and controlling the mixing ratio of the colloidal microspheres and the black light absorbing substances and white micron-sized scatterers. The mixing proportion of the colloid microspheres, the black light-absorbing substances and the white micron-sized scatterers is out of order, so that the color development effect of the material can be influenced, and the material can be colored in a dry state or can not develop color when meeting water.
The invention has the following beneficial effects:
1. the method for preparing the water-meeting color development structural color material is simple and convenient to operate, the used raw materials are cheap and easy to obtain, expensive instruments are not needed, the cost is low, the method is suitable for industrial preparation, is suitable for various purposes, and has good practical popularization and application values.
2. Different structural color characteristics are obtained by selecting colloid microspheres with different particle sizes, and then the structural color of the composite material is continuously regulated and controlled according to actual requirements.
3. The invention provides a preparation method of a water-meeting color-developing structural color material, which solves the problems that the anti-counterfeiting mark is easy to imitate, the technical means identification degree and the threshold are low and the like in the heat-sensitive and fluorescent ink and the like adopted by the traditional optical anti-counterfeiting technology, and has wide application range.
4. The coating prepared by the material can show intrinsic structural color when meeting water, and has important application value and wide application prospect in the industries of high polymer coating and toys.
Drawings
FIG. 1 is a photograph (from left to right, red, green, blue) of a water-developed structural color material in a dry state;
FIG. 2 is a photograph (from left to right, red, green, blue) of a color material of a color structure that develops when exposed to water;
FIG. 3 is a graph of reflectance spectra of blue water-sensitive color materials before and after wetting;
FIG. 4 is a graph of reflectance spectra of green color-developing structural color materials before and after wetting;
FIG. 5 is a graph showing the reflectance spectra of red-colored structural color materials before and after wetting.
Detailed Description
The invention is further illustrated in the following drawings and specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
The preparation method of the water-meeting color development structural color material comprises the following steps: mixing polystyrene microsphere powder with average diameter of 150nm and carbon black at mass ratio of 1:0.002, grinding uniformly, adding into average pore volume of 1.1cm 3 And (3) fully dispersing/g mesoporous silica (the mass ratio of the mesoporous silica to the microspheres is 0.5:1) to obtain the water-dependent color development structural color material.
The performance test was performed on the water-developable structural color material of this example, which exhibited white color in a dry state and appeared blue after being immersed in water, as shown in fig. 1 (right) and fig. 2 (right), and the reflectance spectrum chart confirmed this, as shown in fig. 3.
Example 2
The preparation method of the water-meeting color development structural color material comprises the following steps: mixing polystyrene microsphere powder with average diameter of 200nm and carbon black at mass ratio of 1:0.002, grinding uniformly, adding into average pore volume of 1.1cm 3 And (3) fully dispersing/g mesoporous silica (the mass ratio of the mesoporous silica to the microspheres is 0.5:1) to obtain the water-dependent color development structural color material.
The performance test of the water-meeting color development structural color material of this example was carried out, and the material was white in a dry state and green after being immersed in water, as shown in fig. 1 (middle) and fig. 2 (middle), and the reflectance spectrum chart confirmed this, as shown in fig. 4.
Example 3
The preparation method of the water-meeting color development structural color material comprises the following steps: mixing and grinding silica microsphere powder with average diameter of 110nm and carbon black according to mass ratio of 1:0.002 uniformly, adding into the mixture with average pore volume of 1.1cm 3 And (3) fully dispersing/g mesoporous silica (the mass ratio of the mesoporous silica to the microspheres is 0.5:1) to obtain the water-dependent color development structural color material.
The performance test of the color material of the color development structure in the present example was performed in the same manner as the test method in example 1, and the material appeared white in a dry state and appeared blue after being immersed in water.
Example 4
The preparation method of the water-meeting color development structural color material comprises the following steps: uniformly mixing and grinding polymethyl methacrylate microsphere powder with average diameter of 150nm and carbon black according to the mass ratio of 1:0.002, and adding the mixture into the mixture with average pore volume of 1.1cm 3 And (3) fully dispersing/g mesoporous silica (the mass ratio of the mesoporous silica to the microspheres is 0.5:1) to obtain the water-dependent color development structural color material.
The performance test of the color material of the color development structure in the present example was performed in the same manner as the test method in example 1, and the material appeared white in a dry state and appeared blue after being immersed in water.
Example 5
The preparation method of the water-meeting color development structural color material comprises the following steps: mixing and grinding titanium dioxide microsphere powder with average diameter of 300nm and carbon black according to mass ratio of 1:0.002 uniformly, adding into the mixture with average pore volume of 1.1cm 3 And (3) fully dispersing/g mesoporous silica (the mass ratio of the mesoporous silica to the microspheres is 0.5:1) to obtain the water-dependent color development structural color material.
The performance test of the water-meeting color development structural color material of this example was carried out, and the material was white in a dry state and red after being immersed in water, as shown in fig. 1 (left) and fig. 2 (left), and the reflectance spectrum chart confirmed this, as shown in fig. 5.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (3)
1. A preparation method of a water-meeting color development structural color material is characterized in that submicron colloid microspheres and black light absorption substances are uniformly mixed, then white micron scattering bodies are added, and the water-meeting color development structural color material is obtained through full dispersion; the mass ratio of the submicron colloidal microspheres to the black light absorbing substances to the white micron scatterers is 1:0.002-0.01:0.5-2;
the average diameter of the submicron colloidal microspheres is 100-300 nm, and the submicron colloidal microspheres are any one of silicon dioxide, titanium dioxide, polystyrene and polymethyl methacrylate;
the black light absorbing substance is any one of carbon black, carbon nano tube, graphene and polydopamine;
the white micron-sized scatterer is mesoporous silica or diatomite.
2. The water-based color-developing structural color material prepared by the preparation method of claim 1.
3. A method for preparing a coating by using the water-meeting color-developing structural color material prepared by the preparation method of claim 1, which is characterized in that the method comprises the following steps: and wiping the substrate, drying, spraying or coating the coating on the surface of the substrate, and drying to obtain the coating.
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| CN104233802B (en) * | 2014-09-28 | 2016-06-22 | 苏州印丝特纺织数码科技有限公司 | A kind of preparation method of the silk fabric with photonic crystal structure color |
| CN107903715A (en) * | 2017-11-27 | 2018-04-13 | 陕西科技大学 | A kind of preparation method of the high saturation schemochrome pigment compound based on polypyrrole and silica |
| CN108227053B (en) * | 2018-01-15 | 2021-02-26 | 河北师范大学 | Method for improving color brightness of non-rainbow structural color |
| CN109294336A (en) * | 2018-09-28 | 2019-02-01 | 许昌学院 | A kind of schemochrome Chinese painting colour and preparation method thereof |
| CN110449329A (en) * | 2019-08-08 | 2019-11-15 | 吉林大学 | A kind of preparation method of the non-iris schemochrome film of super-hydrophobicity |
| CN110569948B (en) * | 2019-09-23 | 2023-02-07 | 河北师范大学 | Physical unclonable structural color anti-counterfeiting label identified by artificial intelligence |
| CN110766119B (en) * | 2019-09-27 | 2023-04-25 | 河北师范大学 | Physical unclonable structural color anti-counterfeit label with multiple anti-counterfeit modes |
| CN113072867A (en) * | 2021-02-24 | 2021-07-06 | 中山大学 | Water-based polyurethane structural color waterproof coating and preparation method and application thereof |
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