CN111205701A - Liquid crystal temperature change anti-counterfeiting ink and preparation method thereof - Google Patents
Liquid crystal temperature change anti-counterfeiting ink and preparation method thereof Download PDFInfo
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- CN111205701A CN111205701A CN202010229706.0A CN202010229706A CN111205701A CN 111205701 A CN111205701 A CN 111205701A CN 202010229706 A CN202010229706 A CN 202010229706A CN 111205701 A CN111205701 A CN 111205701A
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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
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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
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/36—Steroidal liquid crystal compounds
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Abstract
The invention provides liquid crystal temperature change anti-counterfeiting ink which comprises the following components in parts by weight: 15-25 parts of cholesteric liquid crystal and microcapsules thereof, 10-15 parts of water-soluble glue solution, 50-60 parts of connecting material, 0.1-1 part of defoaming agent, 0.1-1 part of flatting agent and 0.1-3 parts of viscosity regulator; the cholesteric liquid crystal is a mixture of 4-cyano-4' -pentylbiphenyl and cholesteric oleyl carbonate; the cholesteric liquid crystal microcapsule is a micro-spherical capsule prepared from the cholesteric liquid crystal and a water-soluble glue solution; the water-soluble glue solution is a mixture of gelatin and Arabic gum. The liquid crystal temperature-change anti-counterfeiting ink and the preparation method thereof provided by the invention have the advantages of easily available raw materials, low raw material cost and simple preparation method, are suitable for the field of anti-counterfeiting labels, enable anti-counterfeiting patterns to change color through temperature change, can solve the problems of slow color change, poor contrast effect and the like of the temperature-change ink in the prior art, and have a great application prospect in the field of packaging anti-counterfeiting.
Description
Technical Field
The invention relates to the field of printing ink, in particular to liquid crystal temperature change anti-counterfeiting printing ink and a preparation method thereof.
Background
In the field of printing and packaging, in order to meet higher anti-counterfeiting requirements, temperature-change anti-counterfeiting ink is usually printed on a label, and when the environmental temperature changes, the printed image-text information can show different color effects according to different temperatures, so that the effects of obvious identification and anti-counterfeiting are achieved. The low-temperature thermosensitive color-changing pigment is used as a core component in the anti-counterfeiting ink, contains a special temperature-changing (thermosensitive) functional material, and can obviously change the wavelength of the absorbed visible spectrum when being heated or cooled, and the appearance color of the ink changes along with the temperature change.
The liquid crystal material is a temperature-change functional material with excellent performance, the main component of the material is cholesterol and derivatives thereof, cholesteric liquid crystal molecules are flat and arranged into layers, molecules in the layers are mutually parallel, the long axes of the molecules are parallel to the layers, the multi-layer molecules are gradually twisted into a spiral line and are arranged into a spiral structure along the normal direction of the layers, and the periodic layer spacing is called as the pitch. With the temperature rise, the pitch is gradually reduced, and the wavelength of the scattered light moves to short wave; when the temperature is reduced, the pitch gradually becomes larger, and the scattered light wavelength moves to long wave, so that the appearance color of the cholesteric liquid crystal generates a continuous and reversible thermochromism process. By utilizing the characteristic, some manufacturers try to add the liquid crystal material into the ink directly to achieve the temperature-sensitive color change function, but the manufacturing cost is high, the problems of large particle size, light color depth, easy precipitation and agglomeration and the like of the ink exist, the wide application of the liquid crystal material in printing anti-counterfeiting is severely restricted, the application temperature is low, the color change range is between 20 and 30 ℃, the temperature difference with the actual environment is not large, the intermediate color phase change is difficult to observe by people at room temperature, and the anti-counterfeiting effect is poor.
Disclosure of Invention
Aiming at the problems, the invention provides the liquid crystal temperature-change anti-counterfeiting ink and the preparation method thereof, the raw materials are easy to obtain, the raw material cost is low, the preparation method is simple, the liquid crystal temperature-change anti-counterfeiting ink is suitable for the field of anti-counterfeiting labels, the anti-counterfeiting patterns can change colors through temperature change, the problems of slow color change, poor contrast effect and the like of the temperature-change anti-counterfeiting ink in the prior art can be solved, and the liquid crystal temperature-change anti-counterfeiting ink has a wide application prospect.
In order to achieve the purpose, the invention is solved by the following technical scheme:
the liquid crystal temperature change anti-counterfeiting ink comprises the following components in parts by weight:
15-25 parts of cholesteric liquid crystal and microcapsules thereof, 10-15 parts of water-soluble glue solution, 50-60 parts of connecting material, 0.1-1 part of defoaming agent, 0.1-1 part of flatting agent and 0.1-3 parts of viscosity regulator;
the cholesteric liquid crystal is a mixture of 4-cyano-4' -pentylbiphenyl and cholesteric oleyl carbonate;
the cholesteric liquid crystal microcapsule is a micro-spherical capsule prepared from the cholesteric liquid crystal and a water-soluble glue solution;
the water-soluble glue solution is a mixture of gelatin and Arabic gum.
Preferably, the defoamer is glycerol.
Preferably, the leveling agent is a polyacrylate leveling agent.
Preferably, the viscosity regulator is selected from one of water, varnish, butyl ester and propylene glycol methyl ether acetate.
Preferably, the binder is an aqueous solution of polyvinyl alcohol.
The preparation method of the liquid crystal temperature change anti-counterfeiting ink comprises the following steps:
s1 preparation of cholesteric liquid crystal: fully mixing 4-cyano-4' -pentylbiphenyl and cholesterol oleyl carbonate to prepare cholesteric liquid crystal, wherein the mesomorphic temperature interval of the cholesteric liquid crystal is 20-45 ℃;
s2 preparation of cholesteric liquid crystal microcapsules: mixing gelatin solution and Arabic gum solution according to the mass ratio of 1:1, heating to 60 ℃, keeping the temperature, continuously stirring for 15 minutes at the speed of 2000 rpm, slowly adding the cholesteric liquid crystal prepared in the step S1 in the stirring process, and uniformly dispersing cholesteric liquid crystal molecules in a water-soluble gelatin solution consisting of the gelatin solution and the Arabic gum solution in a micro-particle structure with the diameter of 5-30 mu m in the adding process to form a stable micro-spherical capsule;
s3 preparation of cholesteric liquid crystal microcapsule slurry: cooling to 20-25 ℃, adding formaldehyde solution, and after the microsphere capsule is completely hardened, adjusting the pH value to 7 to obtain liquid crystal microsphere capsule slurry;
s4 preparation of liquid crystal-capsule dispersion: adding the liquid crystal microsphere capsule slurry into cholesteric liquid crystal, wherein the mass ratio of the liquid crystal microsphere capsule slurry to the cholesteric liquid crystal is 35-45: 55-65, then adding a connecting material, and fully mixing to obtain a liquid crystal-capsule dispersion;
s5, preparing liquid crystal temperature change anti-counterfeiting ink: adding the defoaming agent, the leveling agent and the viscosity regulator, and fully stirring to obtain the liquid crystal temperature change anti-counterfeiting ink.
Preferably, in the step S1, the mass ratio of the 4-cyano-4' -pentylbiphenyl to the cholesteryl oleyl carbonate is 40-50: 50-60.
Preferably, in the steps S2 and S3, the gelatin solution is a 15% gelatin aqueous solution, the gum arabic solution is a 2% gum arabic aqueous solution, and the formaldehyde aqueous solution is a 20% formaldehyde aqueous solution.
Preferably, in the step S4, the addition amount of the binder is 50% to 60% of the total amount of the liquid crystal-capsule dispersion.
Preferably, the color change temperature range of the liquid crystal temperature change anti-counterfeiting ink is 20-45 ℃.
The invention has the beneficial effects that:
the liquid crystal temperature-change anti-counterfeiting ink has the advantages of easily available raw materials, low raw material cost and simple preparation method, is suitable for the field of anti-counterfeiting labels, enables anti-counterfeiting patterns to change colors through temperature change, can solve the problems of slow color change, poor contrast effect and the like of the temperature-change anti-counterfeiting ink in the prior art, and has a great application prospect in the field of package anti-counterfeiting;
secondly, the sensitivity of cholesteric liquid crystal to a temperature range is utilized, the upper limit of the temperature change range of the ink is increased to about 45 ℃, so that the color appearance of the anti-counterfeiting ink in different temperature environments has a multi-level strong dynamic contrast effect;
thirdly, the cholesteric liquid crystal is made into cholesteric liquid crystal micro-spherical capsules with small particle size and is mixed with the cholesteric liquid crystal, compared with the situation that the cholesteric liquid crystal is singly added, the cholesteric liquid crystal micro-spherical capsules are not easy to agglomerate, and water-soluble glue solution, connecting materials and other auxiliary agents are added, so that the cholesteric liquid crystal micro-spherical capsules have printability, the dispersibility among raw materials is good, the structure is stable after printing, the color depth is high, and the problems that the particle size of ink particles is large, the color depth is light, the ink particles are easy to precipitate and agglomerate and the like in the traditional temperature change ink can be.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to provide a further understanding of the nature and technical means of the invention, as well as the specific objects and functions attained by the invention.
Example 1
The liquid crystal temperature change anti-counterfeiting ink comprises the following components in parts by weight:
25 parts of cholesteric liquid crystal and microcapsules thereof, 10 parts of water-soluble glue solution, 60 parts of polyvinyl alcohol aqueous solution, 0.5 part of glycerol, 0.1 part of polyacrylate flatting agent and 0.3 part of water;
the cholesteric liquid crystal is a mixture of 4-cyano-4' -pentylbiphenyl and cholesteric oleyl carbonate according to a mass ratio of 45:55, and the optical characteristics of the cholesteric liquid crystal are influenced by the ratio of the two;
the cholesteric liquid crystal microcapsule is a micro-spherical capsule prepared from cholesteric liquid crystal and water-soluble glue solution;
the water-soluble glue solution is a mixture of gelatin and Arabic gum.
The preparation method of the liquid crystal temperature change anti-counterfeiting ink comprises the following steps:
a1 weighing the components according to the formula for later use;
a2 cholesteric liquid crystals were prepared: fully mixing 4-cyano-4' -pentylbiphenyl and 2% gum arabic aqueous solution acid ester to prepare cholesteric liquid crystal, and testing the temperature, wherein the mesomorphic temperature interval of the cholesteric liquid crystal is 20-40 ℃, mesomorphic refers to a substance in a mesomorphic or liquid crystal state, the substance has liquidity and continuity as liquid and anisotropy as crystals, and in the state, along with the temperature rise, the pitch of the cholesteric liquid crystal gradually decreases, and the wavelength of scattered light moves to short wave; when the temperature is reduced, the pitch of the cholesteric liquid crystal is gradually increased, and the scattered light wavelength moves to long wave, so that the appearance color of the cholesteric liquid crystal generates a continuous and reversible thermochromism process, and the mesomorphism state is destroyed and does not change the color at the temperature lower than 20 ℃ or higher than 40 ℃;
a3 cholesteric liquid crystal microcapsules were prepared: mixing a 15% gelatin aqueous solution and a gum arabic solution according to a mass ratio of 1:1, heating to 60 ℃, keeping the temperature, continuously stirring for 15 minutes at a speed of 2000 rpm, slowly adding the cholesteric liquid crystal prepared in the step A2 in the stirring process, and uniformly dispersing cholesteric liquid crystal molecules in a water-soluble glue solution consisting of the gelatin solution and the gum arabic solution in a micro-particle structure with the diameter of 5-30 mu m in the adding process to form a stable micro-spherical capsule;
a4 preparation of cholesteric liquid crystal microcapsule slurry: cooling to 20-25 ℃, adding 20% formaldehyde water solution, and after the microsphere capsule is completely hardened, adjusting the pH value to 7 to obtain liquid crystal microsphere capsule slurry;
a5 preparation of liquid crystal-capsule dispersions: adding the liquid crystal microsphere capsule slurry into cholesteric liquid crystal, wherein the mass ratio of the liquid crystal microsphere capsule slurry to the cholesteric liquid crystal is 35-45: 55-65, then adding a polyvinyl alcohol aqueous solution, wherein the addition amount of the polyvinyl alcohol aqueous solution is 50% -60% of the total amount of the liquid crystal-capsule dispersoid, and fully mixing to obtain the liquid crystal-capsule dispersoid;
a6 preparation of liquid crystal temperature change anti-counterfeiting ink: adding glycerol, a polyacrylate flatting agent and water, and fully stirring to obtain the liquid crystal temperature change anti-counterfeiting ink.
Test a 7: through temperature tests, the color-changing temperature range of the liquid crystal temperature-changing anti-counterfeiting ink is 20-40 ℃, and compared with the existing temperature-changing ink with the color-changing range of 20-30 ℃, the upper limit of the color-changing temperature of the liquid crystal temperature-changing anti-counterfeiting ink is obviously improved.
Example 2
The liquid crystal temperature change anti-counterfeiting ink comprises the following components in parts by weight:
25 parts of cholesteric liquid crystal and microcapsules thereof, 10 parts of water-soluble glue solution, 60 parts of polyvinyl alcohol aqueous solution, 0.5 part of glycerol, 0.1 part of polyacrylate flatting agent and 0.3 part of water;
the cholesteric liquid crystal is a mixture of 4-cyano-4' -pentylbiphenyl and cholesteric oleyl carbonate according to a mass ratio of 40:60, and the optical characteristics of the cholesteric liquid crystal are influenced by the ratio of the two;
the cholesteric liquid crystal microcapsule is a micro-spherical capsule prepared from cholesteric liquid crystal and water-soluble glue solution;
the water-soluble glue solution is a mixture of gelatin and Arabic gum.
The preparation method of the liquid crystal temperature change anti-counterfeiting ink comprises the following steps:
b1 weighing the components according to the formula for later use;
b2 preparation of cholesteric liquid crystals: fully mixing 4-cyano-4' -pentylbiphenyl and 2% gum arabic aqueous solution acid ester to prepare cholesteric liquid crystal, and testing the temperature, wherein the mesomorphic temperature interval of the cholesteric liquid crystal is 20-45 ℃, mesomorphic refers to a substance in a mesomorphic or liquid crystal state, the substance has liquidity and continuity as liquid and anisotropy as crystals, and in the state, along with the temperature rise, the pitch of the cholesteric liquid crystal gradually decreases, and the wavelength of scattered light moves to short wave; when the temperature is reduced, the pitch of the cholesteric liquid crystal is gradually increased, and the scattered light wavelength moves to long wave, so that the appearance color of the cholesteric liquid crystal generates a continuous and reversible thermochromism process, and therefore, the temperature is lower than 20 ℃ or higher than 45 ℃, and the mesomorphism is damaged without changing color;
b3 preparation of cholesteric liquid crystal microcapsules: mixing a 15% gelatin aqueous solution and a gum arabic solution according to a mass ratio of 1:1, heating to 60 ℃, keeping the temperature, continuously stirring for 15 minutes at a speed of 2000 rpm, slowly adding the cholesteric liquid crystal prepared in the step B2 in the stirring process, and uniformly dispersing cholesteric liquid crystal molecules in a water-soluble glue solution consisting of the gelatin solution and the gum arabic solution in a micro-particle structure with the diameter of 5-30 microns in the adding process to form a stable micro-spherical capsule;
b4 preparation of cholesteric liquid crystal microcapsule slurry: cooling to 20-25 ℃, adding 20% formaldehyde water solution, and after the microsphere capsule is completely hardened, adjusting the pH value to 7 to obtain liquid crystal microsphere capsule slurry;
b5 preparation of liquid crystal-capsule dispersions: adding the liquid crystal microsphere capsule slurry into cholesteric liquid crystal, wherein the mass ratio of the liquid crystal microsphere capsule slurry to the cholesteric liquid crystal is 35-45: 55-65, then adding a polyvinyl alcohol aqueous solution, wherein the addition amount of the polyvinyl alcohol aqueous solution is 50% -60% of the total amount of the liquid crystal-capsule dispersoid, and fully mixing to obtain the liquid crystal-capsule dispersoid;
b6 preparation of liquid crystal temperature change anti-counterfeiting ink: adding glycerol, a polyacrylate flatting agent and water, and fully stirring to obtain the liquid crystal temperature change anti-counterfeiting ink.
B7 test: through temperature tests, the color-changing temperature range of the liquid crystal temperature-changing anti-counterfeiting ink is 20-45 ℃, and compared with the existing temperature-changing ink with the color-changing range of 20-30 ℃, the upper limit of the color-changing temperature of the liquid crystal temperature-changing anti-counterfeiting ink is obviously improved.
The above examples only show 2 embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The liquid crystal temperature change anti-counterfeiting ink is characterized by comprising the following components in parts by weight:
15-25 parts of cholesteric liquid crystal and microcapsules thereof, 10-15 parts of water-soluble glue solution, 50-60 parts of connecting material, 0.1-1 part of defoaming agent, 0.1-1 part of flatting agent and 0.1-3 parts of viscosity regulator;
the cholesteric liquid crystal is a mixture of 4-cyano-4' -pentylbiphenyl and cholesteric oleyl carbonate;
the cholesteric liquid crystal microcapsule is a micro-spherical capsule prepared from the cholesteric liquid crystal and a water-soluble glue solution;
the water-soluble glue solution is a mixture of gelatin and Arabic gum.
2. The liquid crystal temperature-sensitive anti-counterfeiting ink according to claim 1, wherein the defoaming agent is glycerol.
3. The liquid crystal temperature-change anti-counterfeiting ink according to claim 1, wherein the leveling agent is a polyacrylate leveling agent.
4. The liquid crystal temperature-change anti-counterfeiting ink as claimed in claim 1, wherein the viscosity regulator is selected from one of water, varnish, butyl ester and propylene glycol methyl ether acetate.
5. The liquid crystal temperature-change anti-counterfeiting ink according to claim 1, wherein the binder is a polyvinyl alcohol aqueous solution.
6. The preparation method of the liquid crystal temperature-change anti-counterfeiting ink applies the liquid crystal temperature-change anti-counterfeiting ink as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps:
s1 preparation of cholesteric liquid crystal: fully mixing 4-cyano-4' -pentylbiphenyl and cholesterol oleyl carbonate to prepare cholesteric liquid crystal, wherein the mesomorphic temperature interval of the cholesteric liquid crystal is 20-45 ℃;
s2 preparation of cholesteric liquid crystal microcapsules: mixing gelatin solution and Arabic gum solution according to the mass ratio of 1:1, heating to 60 ℃, keeping the temperature, continuously stirring for 15 minutes at the speed of 2000 rpm, slowly adding the cholesteric liquid crystal prepared in the step S1 in the stirring process, and uniformly dispersing cholesteric liquid crystal molecules in a water-soluble gelatin solution consisting of the gelatin solution and the Arabic gum solution in a micro-particle structure with the diameter of 5-30 mu m in the adding process to form a stable micro-spherical capsule;
s3 preparation of cholesteric liquid crystal microcapsule slurry: cooling to 20-25 ℃, adding formaldehyde solution, and after the microsphere capsule is completely hardened, adjusting the pH value to 7 to obtain liquid crystal microsphere capsule slurry;
s4 preparation of liquid crystal-capsule dispersion: adding the liquid crystal microsphere capsule slurry into cholesteric liquid crystal, wherein the mass ratio of the liquid crystal microsphere capsule slurry to the cholesteric liquid crystal is 35-45: 55-65, then adding a connecting material, and fully mixing to obtain a liquid crystal-capsule dispersion;
s5, preparing liquid crystal temperature change anti-counterfeiting ink: adding the defoaming agent, the leveling agent and the viscosity regulator, and fully stirring to obtain the liquid crystal temperature change anti-counterfeiting ink.
7. The method for preparing the liquid crystal temperature-change anti-counterfeiting ink according to claim 6, wherein in the step S1, the mass ratio of the 4-cyano-4' -pentylbiphenyl to the cholesterol oleyl carbonate is 40-50: 50-60.
8. The method of claim 6, wherein the gelatin solution is 15% gelatin solution, the gum arabic solution is 2% gum arabic solution, and the formaldehyde solution is 20% formaldehyde solution in the steps S2 and S3.
9. The method for preparing the liquid crystal temperature-change anti-counterfeiting ink according to claim 6, wherein in the step S4, the addition amount of the binder is 50-60% of the total amount of the liquid crystal-capsule dispersion.
10. The preparation method of the liquid crystal temperature-change anti-counterfeiting ink according to claim 6, wherein the color change temperature range of the liquid crystal temperature-change anti-counterfeiting ink is 20-45 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112724747A (en) * | 2020-12-30 | 2021-04-30 | 江苏集萃智能液晶科技有限公司 | Temperature-change liquid crystal microcapsule ink and preparation method thereof |
| CN112980248A (en) * | 2021-02-23 | 2021-06-18 | 江苏集萃智能液晶科技有限公司 | Thermochromic liquid crystal microcapsule ink and thermochromic coating |
| CN113072963A (en) * | 2021-04-01 | 2021-07-06 | 江苏集萃智能液晶科技有限公司 | Monochromatic liquid crystal composition, liquid crystal microcapsule, coating and preparation method thereof |
| CN116515340A (en) * | 2023-03-06 | 2023-08-01 | 北京印刷学院 | Cholesteric liquid crystal/polymer composite system microcapsule and preparation method thereof |
| CN116606566A (en) * | 2023-04-07 | 2023-08-18 | 福建省雅泰印刷包装有限公司 | Anti-counterfeiting ink and viscosity adjusting method |
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| CN1062744A (en) * | 1991-12-21 | 1992-07-15 | 深圳北方投资开发公司 | Liquid crystal heat colour-changed printing ink |
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| CN1062744A (en) * | 1991-12-21 | 1992-07-15 | 深圳北方投资开发公司 | Liquid crystal heat colour-changed printing ink |
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| 钱军浩: "《新型油墨印刷技术》", 31 January 2003, 中国轻工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112724747A (en) * | 2020-12-30 | 2021-04-30 | 江苏集萃智能液晶科技有限公司 | Temperature-change liquid crystal microcapsule ink and preparation method thereof |
| CN112980248A (en) * | 2021-02-23 | 2021-06-18 | 江苏集萃智能液晶科技有限公司 | Thermochromic liquid crystal microcapsule ink and thermochromic coating |
| CN113072963A (en) * | 2021-04-01 | 2021-07-06 | 江苏集萃智能液晶科技有限公司 | Monochromatic liquid crystal composition, liquid crystal microcapsule, coating and preparation method thereof |
| CN116515340A (en) * | 2023-03-06 | 2023-08-01 | 北京印刷学院 | Cholesteric liquid crystal/polymer composite system microcapsule and preparation method thereof |
| CN116515340B (en) * | 2023-03-06 | 2024-05-03 | 北京印刷学院 | Cholesteric liquid crystal/polymer composite system microcapsule and preparation method thereof |
| CN116606566A (en) * | 2023-04-07 | 2023-08-18 | 福建省雅泰印刷包装有限公司 | Anti-counterfeiting ink and viscosity adjusting method |
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