CN113005812A - Thermochromic anti-counterfeiting coating and thermochromic anti-counterfeiting paper - Google Patents
Thermochromic anti-counterfeiting coating and thermochromic anti-counterfeiting paper Download PDFInfo
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- CN113005812A CN113005812A CN202110206317.0A CN202110206317A CN113005812A CN 113005812 A CN113005812 A CN 113005812A CN 202110206317 A CN202110206317 A CN 202110206317A CN 113005812 A CN113005812 A CN 113005812A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/20—After-treatment of capsule walls, e.g. hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/28—Colorants ; Pigments or opacifying agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
The application relates to the field of anti-counterfeiting paper, and particularly discloses a thermochromic anti-counterfeiting coating and thermochromic anti-counterfeiting paper. The thermochromic anti-counterfeiting coating comprises the following raw materials in parts by weight: 75-85 parts of acrylic emulsion, 3-7 parts of low-temperature color-changing material, 0-3 parts of hydroxyethyl cellulose sodium, 1.5-2.5 parts of dispersant, 0.2-0.6 part of lubricant and 0.01-0.03 part of defoamer; wherein, the low-temperature color-changing material adopts transparent microcapsules; the thermochromic anti-counterfeiting paper is prepared from thermochromic anti-counterfeiting coating, and the thickness of the coating is 50-70 μm. The thermochromic anti-counterfeiting coating can be used for anti-counterfeiting paper, and has the advantages of good anti-counterfeiting effect and small influence of the pH value of the surrounding environment.
Description
Technical Field
The application relates to the field of anti-counterfeiting paper, in particular to thermochromic anti-counterfeiting coating and thermochromic anti-counterfeiting paper.
Background
The anti-fake paper is one kind of special paper with mark or hidden mark on the surface and is not easy to forge, fake or alter. Thermochromic security paper is one of security papers, and comprises two types of irreversible and reversible. Reversible thermochromic refers to that one color is heated to raise temperature, the color is changed into another color, and the original color is recovered after cooling.
The principle of thermochromic is that a special thermosensitive material is added into the coating and coated on the surface of the anti-counterfeiting paper, when the coating is heated to a certain temperature, molecules of the thermosensitive thermochromic material in the coating can correspondingly change in structure or form, the color of the coating changes accordingly, and the temperature can be indicated.
The thermochromic paint is widely applied to the aspects of safety warning, chemical anti-counterfeiting and the like, but the existing thermochromic paint mostly changes color at high temperature, and the research on the low-temperature photochromic paint is less. Meanwhile, most of low-temperature color-changing materials are organic materials and are greatly influenced by the pH value of the surrounding environment.
Disclosure of Invention
In order to reduce the influence of the pH of the surrounding environment on the low-temperature color-changing material, the application provides the thermochromic anti-counterfeiting coating and thermochromic anti-counterfeiting paper.
In a first aspect, the application provides a thermochromic anti-counterfeiting coating, which adopts the following technical scheme:
75-85 parts of acrylic emulsion, 3-7 parts of low-temperature color-changing material, 0-3 parts of hydroxyethyl cellulose sodium, 1.5-2.5 parts of dispersant, 0.2-0.6 part of lubricant and 0.01-0.03 part of defoamer; the low-temperature color-changing material is filled in a transparent microcapsule, and the transparent microcapsule comprises a wall material and a core material.
By adopting the technical scheme, the application range of the thermochromic anti-counterfeiting coating is expanded and the service life of the thermochromic anti-counterfeiting coating is prolonged due to the microencapsulation technology.
The method is characterized in that the microencapsulation technology can avoid irreversible color development caused by organic solvent, strong acidity or impurity pollution on one hand, and can also enhance light resistance and stability; on the other hand, materials with different color-changing temperatures can be allowed to be used under more conditions, and the compatibility of the low-temperature color-changing material and other materials can be improved, so that the application range is expanded.
The addition of the hydroxyethyl cellulose in the raw materials can increase the viscosity of the coating, prevent the sagging phenomenon in construction, and endow the coating with excellent mechanical properties and good storage stability.
The hydrophobic main chain of the hydroxyethyl cellulose sodium is associated with the surrounding water molecules through hydrogen bonds, the fluid volume of the hydroxyethyl cellulose sodium is increased, and the free activity space of particles in the system is reduced, so that the viscosity of the system is increased. It is also possible to increase the viscosity of the system by entanglement of the molecular chains, with high viscosity at static and low shear, while maintaining a lower viscosity at high shear.
Preferably, the mass ratio of the core material to the wall material is 2: 1.
by adopting the technical scheme, the mass ratio of the core material to the wall material, namely the core-wall ratio, and the wall thickness of the prepared microcapsule are seriously influenced by the core-wall ratio, so that the color change sensitivity of the microcapsule is influenced.
When the core-wall ratio is smaller than 2, the use amount of wall materials is large, and the microcapsule prepared under the condition has the advantages of thick capsule wall, slow heat conduction, long color change time and insensitive response to temperature.
The capsule wall is thinner when the core wall ratio is larger, the time for color change and color restoration is short, and the color change sensitivity is high, but when the core wall ratio is too large and is larger than 2:1, the coating rate is low, and part of color change materials are not coated.
Preferably, the wall material is polyvinyl alcohol.
By adopting the technical scheme, the wall material is transparent, the color change of the core material is not influenced, and the core material is wrapped in the wall material and does not contact with the external environment, so that the influence of the pH value of the surrounding environment on substances in the core material is avoided, and the service life of the thermochromic anti-counterfeiting coating is prolonged.
Preferably, the core material comprises a color developing agent, a dye and tetradecanol, and the mass ratio of the color developing agent to the dye to the tetradecanol is 4: 1: 30.
by adopting the technical scheme, the mass ratio of the color developing agent to the dye to the tetradecanol is 4: 1: 30 f, the color change sensitivity of the core material is high.
Preferably, the color developer is bisphenol A, and the dye is thermal scarlet.
By adopting the technical scheme, the thermochromic anti-counterfeiting coating prepared by combining bisphenol A and thermosensitive scarlet has an obvious color change effect in the use process.
Preferably, the core material also comprises 2-6 parts of reversible color-changing plant fiber.
By adopting the technical scheme, due to the diversity and distribution flexibility of the fibers, the colored fibers with various colors can be easily seen in the anti-counterfeiting paper, so that the anti-counterfeiting purpose is achieved.
Preferably, the raw material also comprises 10-15 parts of calcium carbonate.
By adopting the technical scheme, the calcium carbonate has good dispersion stability, the paint can still keep stable after being placed, and the color-changing paint prepared by taking the calcium carbonate as the filler has bright color.
The more calcium carbonate is used, the better the coating hiding power is. When the using amount is too small, the coating is smooth and obvious in color, but the covering power is insufficient; when the amount is excessively used, the viscosity of the coating material increases, the coating film tends to be uneven, the hiding power of the coating material becomes too strong, and the color tends to become light.
When the calcium carbonate is used in 10-15 weight portions, the paint has proper viscosity, smooth surface, obvious color and high covering power.
Preferably, the dispersant is polyacrylamide.
Through adopting above-mentioned technical scheme, under the dispersant effect, all the other raw materials can make homodisperse in mill base, and pack the particle surface and can generate the adsorbed layer that has certain thickness, form certain steric hindrance, and the adsorbed layer can prevent to take place the gathering phenomenon between the particle, and when packing the particle and being close to each other, the adsorbed layer takes place to extrude and can produce the repulsion force to prevent that the particle from taking place the gathering.
When the addition amount of the dispersing agent is too small, the adsorption layer around the particles is thin, so that the steric hindrance layer formed on the surface of the dispersing agent particles is not thick enough, the van der Waals force among the particles is larger than the repulsive force generated by extrusion of the adsorption layer, part of the particles approach each other under the action of the van der Waals force, the agglomeration phenomenon occurs, the diameter of part of the agglomerated particles is enlarged, and the layering phenomenon occurs to the coating.
When the addition amount of the dispersing agent is too large, the color paste is easy to generate a foaming phenomenon in the preparation process, so that the dispersion process is influenced, and the dispersion time is prolonged. Meanwhile, foams generated by the dispersant can also affect the coating film of the coating, so that the coating film is not uniform.
Preferably, the defoamer is a silicone defoamer.
By adopting the technical scheme, the foam generated by the dispersing agent can be eliminated by adding the defoaming agent, so that the dispersing time is shortened; meanwhile, the addition of the defoaming agent can eliminate coating obstacles, facilitate the coating of the coating and ensure that the coating is uniform.
The organic silicon defoaming agent has a good defoaming effect, and can effectively eliminate coating obstacles, so that the coating is uniform.
In a second aspect, the application provides thermochromic anti-counterfeit paper, which adopts the following technical scheme:
a thermochromic anti-counterfeiting paper is prepared from thermochromic anti-counterfeiting coating, and the thickness of the coating is 50-70 μm.
By adopting the technical scheme, the thermochromic anti-counterfeiting coating is uniformly coated on the surface of the thermochromic anti-counterfeiting paper, and the anti-counterfeiting effect is good.
If the coating is too thick, the color change process requires more energy, which results in slower color change speed and higher color change temperature.
In summary, the present application has the following beneficial effects:
1. because the transparent microcapsule is adopted, on one hand, irreversible color development caused by organic solvent, strong acidity or impurity pollution is avoided, light resistance and stability are enhanced, on the other hand, the compatibility of the low-temperature color-changing material and other materials is improved, and thus the application range is expanded;
2. calcium carbonate is preferably added into the raw materials, and the prepared coating is bright in color and can still keep stable after being placed due to good dispersion stability of the calcium carbonate;
3. in the application, the color developing agent is preferably bisphenol A, the dye is thermosensitive scarlet, and the prepared thermochromic anti-counterfeiting coating has an obvious color changing effect in the using process.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of transparent microcapsule
Preparation example 1
S1, weighing thermosensitive scarlet, bisphenol A and tetradecanol according to a proportion, adding tetradecanol into a four-mouth bottle, heating to be molten, adding thermosensitive scarlet and reversible color-changing plant fiber, heating to 50 ℃, stirring to be completely dissolved, adding a certain amount of bisphenol A, stirring at a speed of 400r/min, heating to about 70 ℃, reacting at a constant temperature and a constant speed for 1.5h, naturally cooling to room temperature, and using an emulsified emulsion for later use;
s2, weighing a certain amount of polyvinyl alcohol, adding 25mL of deionized water, heating to 40 ℃, slowly stirring, soaking for 1h, gradually heating to 95 ℃, accelerating the rotation speed, stirring at constant temperature until the polyvinyl alcohol is completely dissolved, and cooling the polyvinyl alcohol solution to room temperature for later use;
s3, taking a certain amount of polyvinyl alcohol solution, stirring and raising the temperature to 40 ℃, slowly dropping a proper amount of n-butyl aldehyde, stirring at a constant temperature for 1h, cooling to 10-15 ℃, adjusting the pH value of the prepolymer solution to 4-5 by using a 10% hydrochloric acid solution, stirring uniformly, slowly raising the temperature to 40 ℃, and reacting for 2 h.
S4, weighing a certain amount of prepolymer solution consisting of polyvinyl alcohol and n-butyl aldehyde at room temperature, dropwise adding the emulsion in the S1 while stirring, slowly heating to 65-75 ℃ after finishing dropping within 1.5h, carrying out heat preservation reaction for 3h, washing after curing, carrying out suction filtration, and carrying out vacuum drying at 50 ℃ for 24h to obtain microcapsule powder.
Wherein the particle diameter of the microcapsule is 0.5-5 μm, the thickness of the wall material is 0.1-0.5 μm, and the mass ratio of the core material to the wall material of the microcapsule is 2: 1.
Examples
Example 1
A preparation method of thermochromic anti-counterfeiting coating comprises the following preparation steps:
s1, weighing the raw materials according to the mass, pouring the dispersing agent into water, and stirring to uniformly disperse the dispersing agent in the water to prepare a dispersing agent solution;
s2, adding sodium hydroxyethyl cellulose into the dispersant solution, and stirring for 2 hours at a stirring speed of 600 r/min to obtain a viscous solution;
s3, weighing the microcapsule powder in the preparation example 1, adding the microcapsule powder into the viscous solution, uniformly stirring, adding the organic silicon defoaming agent, and continuously stirring for 1h to obtain color paste for later use;
and S4, adding color paste and a small amount of defoaming agent into the acrylic emulsion, and stirring for 2 hours to obtain the thermochromic anti-counterfeiting coating.
The specific amounts of the above-mentioned raw materials are shown in table 2.
Examples 2 to 5
The preparation methods of the thermochromic anti-counterfeiting coatings in examples 2 to 5 are the same as those in example 1, and the differences are only that the thermochromic anti-counterfeiting coatings are different in raw materials and dosage, and are specifically shown in table 2:
TABLE 2 materials and amounts of thermochromic anti-counterfeit coatings of examples 1-5
| Raw materials and dosage | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Acrylic emulsion | 80 | 75 | 85 | 80 | 85 |
| Calcium carbonate | 12 | 10 | 15 | 12 | 15 |
| Transparent microcapsules | 5 | 3 | 7 | 4 | 7 |
| Reversible color-changing plant fiber | 9 | 7 | 12 | 8 | - |
| Sodium hydroxyethyl cellulose | 2 | 1 | 3 | - | 2 |
| Polyacrylamide | 2.0 | 1.5 | 2.5 | 1.8 | 2.5 |
| Lubricant agent | 0.4 | 0.2 | 0.6 | 0.4 | 0.6 |
| Organic silicon defoaming agent | 0.02 | 0.01 | 0.03 | 0.02 | 0.03 |
Comparative example 1
The preparation method of the thermochromic anti-counterfeiting coating of comparative example 1 is the same as that of example 1 except that the low-temperature color-changing material is not microencapsulated.
Application example 1
The thermochromic anti-counterfeiting coating prepared in the embodiment 1 is coated on anti-counterfeiting paper, the thickness of the coating is 50-70 mu m, and the thermochromic anti-counterfeiting paper is prepared after drying.
Performance test
Testing solvent resistance and acid and alkali resistance: the thermochromic anti-counterfeiting coatings of example 1 and comparative example 1 were placed in different solvents for testing, and the test results are shown in table 3:
table 3 test results for examples 1-5
As can be seen by combining examples 1-5 and Table 3, the thermochromic anti-counterfeiting coatings of examples 1-5 are insoluble and unchanged in color when placed in water; the thermochromic anti-counterfeiting coatings of examples 1-5 were placed in benzene and were insoluble and unchanged in color; the thermochromic anti-counterfeiting coatings of examples 1-5 were placed in 10% hydrochloric acid, and were not dissolved and the color did not change; the thermochromic anti-counterfeiting coatings of examples 1 to 5 were placed in 2% NaOH, and were insoluble and light in color and did not recover at room temperature, which indicates that the thermochromic anti-counterfeiting coatings prepared by the present application have good solvent resistance, acid and alkali resistance, and are not easily affected by the pH of the surrounding environment.
Performance test
Testing solvent resistance and acid and alkali resistance: the thermochromic anti-counterfeiting coatings of example 1 and comparative example 1 were placed in different solvents for testing, and the test results are shown in table 4:
table 4 test results of example 1 and comparative example 1
It can be seen by combining example 1 and comparative example 1 and combining table 4 that the thermochromic anti-counterfeiting coating of comparative example 1 does not have good solvent resistance and acid and alkali resistance, which indicates that microencapsulation can enhance the thermal stability, solvent resistance, acid and alkali resistance and other environmental weather resistance of thermochromic anti-counterfeiting paper.
Examples 6 to 9
The preparation steps of the thermochromic anti-counterfeiting coatings in examples 6 to 9 are the same as those in example 1, except that the amount of calcium carbonate is different, and are specifically shown in table 5:
TABLE 5 calcium carbonate amounts used in examples 6-9
| Example 6 | Example 7 | Example 8 | Example 9 | |
| Dosage of | - | 3 | 7 | 18 |
Performance test
The paints of example 1 and examples 6 to 9 were coated on a ground aluminum sheet of a certain size to prepare a coating film, and the stability of the paints and the performance of the coating film were observed by naked eyes.
Combining examples 1 and 6-9, it can be seen that the coatings of examples 7-9 are bright in color, but have insufficient hiding power, and the coating of example 9 has too high a viscosity, resulting in uneven application, indicating that the amount of calcium carbonate used has a significant effect on the coating and the performance of the coating film.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The thermochromic anti-counterfeiting coating is characterized by comprising the following raw materials in parts by mass: 75-85 parts of acrylic emulsion, 3-7 parts of low-temperature color-changing material, 0-3 parts of hydroxyethyl cellulose sodium, 1.5-2.5 parts of dispersant, 0.2-0.6 part of lubricant and 0.01-0.03 part of defoamer; the low-temperature color-changing material is filled in a transparent microcapsule, and the transparent microcapsule comprises a wall material and a core material.
2. The thermochromic anti-counterfeiting coating according to claim 1, wherein: the mass ratio of the core material to the wall material is 2: 1.
3. the thermochromic anti-counterfeiting coating according to claim 1, wherein: the wall material is polyvinyl alcohol.
4. The thermochromic anti-counterfeiting coating according to claim 1, wherein: the core material comprises a color developing agent, a dye and tetradecanol, wherein the mass ratio of the color developing agent to the dye to the tetradecanol is 4: 1: 30.
5. the thermochromic anti-counterfeiting coating according to claim 4, wherein: the color developing agent is bisphenol A, and the dye is thermal sensitive scarlet.
6. The thermochromic anti-counterfeiting coating according to claim 4, wherein: the core material also comprises 7-12 parts of reversible color-changing plant fiber.
7. The thermochromic anti-counterfeiting coating according to claim 1, wherein: the raw material also comprises 10-15 parts of calcium carbonate.
8. The thermochromic anti-counterfeiting coating according to claim 1, wherein: the dispersant is polyacrylamide.
9. The thermochromic anti-counterfeiting coating according to claim 1, wherein: the defoaming agent is an organic silicon defoaming agent.
10. A thermochromic anti-counterfeiting paper is characterized in that: the thermochromic anti-counterfeiting paper is prepared from the thermochromic anti-counterfeiting coating of any one of claims 1 to 9, and the thickness of the coating is 50 to 70 microns.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113990176A (en) * | 2021-11-19 | 2022-01-28 | 中山大学 | Preparation method and application of anti-counterfeit label based on temperature-induced phase-change hydrogel |
| CN114575191A (en) * | 2022-03-24 | 2022-06-03 | 大连工业大学 | Preparation method of insulation material super-aging critical temperature indicating functional paper |
| CN116042041A (en) * | 2023-03-07 | 2023-05-02 | 江苏艾肯复元新材料技术有限公司 | Thermochromic water-based nano coating and preparation method thereof |
| CN116102923A (en) * | 2022-12-29 | 2023-05-12 | 广东邦固化学科技有限公司 | Temperature-changing anti-counterfeiting coating and preparation method thereof |
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