CN112708303A - Cholesteric liquid crystal structural color material, preparation method thereof and application thereof in image-text printing - Google Patents
Cholesteric liquid crystal structural color material, preparation method thereof and application thereof in image-text printing Download PDFInfo
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- 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
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
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Abstract
The cholesteric liquid crystal structure color material is sol emulsion formed by uniformly dispersing cholesteric liquid crystals in a polyvinyl alcohol and cationic starch sol system. The invention also provides a preparation method of the cholesteric liquid crystal structure color material. The invention also provides application of the cholesteric liquid crystal structure color material in image-text printing. The cholesteric liquid crystal structure color material can form a liquid crystal sol emulsion system which is uniformly distributed, has a simple preparation process and low cost, and can ensure that the ink has excellent printability and film forming property when being applied to the ink.
Description
Technical Field
The invention relates to structural color ink, in particular to a cholesteric liquid crystal structural color material, a preparation method thereof and application thereof in image-text printing.
Background
The structural color material widely exists in nature, the color originates from the result of the effect of Bragg diffraction, selective reflection and the like of the photonic crystal structure on visible light, and the construction of the photonic crystal microstructure can be realized by the means of the prior art, so that the graphic and text information is presented in a novel way. The structural color material has great application prospect in the field of printing and packaging, and domestic patent documents (Chinese invention application specifications such as publication numbers CN1808214A, CN108530583A and the like) report the application of common colloidal photonic crystals in printing and packaging, but the material has high processing cost, is difficult to liquefy ink and is difficult to apply and popularize on a large scale.
Cholesteric liquid crystal is a photonic crystal material with a micro-nano structure, mesomorphic liquid crystal molecules can be rotationally arranged along a vertical axis and have a periodic pitch structure, and when the pitch is the same as the wavelength of visible light, the material displays corresponding colors by selectively reflecting light waves within a certain wavelength range. Cholesteric liquid crystals in a mesomorphic state generally have good fluidity, and are difficult to stably exist and realize effective output of information such as color and the like.
In the prior art, microencapsulation treatment is often needed, and a polymer material is used for wrapping cholesteric liquid crystal to form more stable core-shell structure microspheres, and the preparation methods of the core-shell structure liquid crystal microspheres and films are reported in the prior patent literature (Chinese patent application specifications such as publication No. CN 107312123A, CN 108786676A, CN 111205701A). Based on the cholesteric liquid crystal structure color material, the printable ink is prepared by uniformly dispersing the liquid crystal microcapsule in an oily or aqueous binder. However, the size of the liquid crystal microspheres in the obtained cholesteric liquid crystal structural color material is effectively controlled by a simple and feasible method, and the size uniformity is poor; and the thickness of the shell material of the microsphere polymer needs to be controlled to be thin enough to meet the selective absorption and reflection of the cholesteric liquid crystal core material on visible light, so that the saturation and the presentation effect of color are ensured. The problems of the microencapsulated cholesteric liquid crystal greatly limit the preparation and application of structural color materials of the cholesteric liquid crystal.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cholesteric liquid crystal structure color material, a preparation method thereof and application thereof in image-text printing, wherein the cholesteric liquid crystal structure color material can form a uniformly distributed liquid crystal sol emulsion system, has a simple preparation process and low cost, and can enable ink to have excellent printability and film forming characteristics when applied to ink. The technical scheme is as follows:
the cholesteric liquid crystal structure color material is characterized in that the cholesteric liquid crystal structure color material is sol emulsion formed by uniformly dispersing cholesteric liquid crystals in a polyvinyl alcohol and cationic starch sol system.
The invention also provides a preparation method of the cholesteric liquid crystal structure color material, which is characterized by comprising the following steps:
(1) dissolving polyvinyl alcohol and cationic starch in water together to obtain a polyvinyl alcohol and cationic starch aqueous solution;
(2) adjusting the polyvinyl alcohol and cationic starch aqueous solution to a set temperature, adding the cholesteric liquid crystal into the polyvinyl alcohol and cationic starch aqueous solution, and uniformly stirring to obtain a white sol emulsion which is a required cholesteric liquid crystal structural color material.
The white sol emulsion is formed by uniformly dispersing cholesteric liquid crystal in a polyvinyl alcohol and cationic starch sol system.
And (3) after the white sol emulsion is obtained in the step (2), adding an emulsion stabilizer into the white sol emulsion, uniformly mixing, and standing and storing at room temperature. Preferably, the emulsion stabilizer is sodium carboxymethylcellulose, and the addition amount of the emulsion stabilizer is 0.05-0.3% of the weight of the white sol emulsion.
Preferably, in the step (1), after the polyvinyl alcohol and the cationic starch are added into the water, the mixture is heated to 92-97 ℃ and kept warm for 20-50 minutes, and meanwhile, a mechanical stirring device is used for continuously stirring, so that a uniform polyvinyl alcohol and cationic starch water solution is obtained. The rotation speed of the continuous stirring is preferably 500-1000 rpm.
Preferably, in the polyvinyl alcohol and cationic starch aqueous solution obtained in the step (1), the weight percentage content of the polyvinyl alcohol is 8-15%, and the weight percentage content of the cationic starch is 1-5%.
Preferably, in step (1), the water used is deionized water.
In step (1), the polyvinyl alcohol used may be PVA1788 type or PVA1799 type.
In the step (1), the cationic starch used can be starch with tertiary amino groups or quaternary ammonium groups etherified.
Preferably, the set temperature in the step (2) is 10-15 ℃ higher than the clearing point temperature of the cholesteric liquid crystal.
Preferably, in the step (2), the cholesteric liquid crystal is added, then the stirring is continued for 8 to 15 hours, the temperature is gradually reduced to 20 to 30 ℃, and the temperature reduction rate is 30 to 60 ℃/min, so as to obtain the white sol emulsion.
Preferably, the cholesteric liquid crystal is formed by mixing a nematic liquid crystal material and a chiral dopant according to the weight ratio of 5-50% of the nematic liquid crystal material and 95-50% of the chiral dopant. More preferably, the nematic liquid crystal material is one or a mixture of more of 4-cyano-4 '-pentylbiphenyl, 4-cyano-4' -hexylbiphenyl, 4-cyano-4 '-heptylbiphenyl and 4-cyano-4' -octylbiphenyl. More preferably, the chiral dopant is one or more of cholesteryl formate, cholesteryl acetate, cholesteryl valerate, cholesteryl heptanoate, cholesteryl n-octanoate, cholesteryl decanoate and cholesteryl carbonate. When the composition of the cholesteric liquid crystal is changed, the color information is changed (from red to violet).
Preferably, the addition amount of the cholesteric liquid crystal is 3-8 times of the weight of polyvinyl alcohol, so that the liquid crystal material has higher distribution density in the white sol emulsion.
The viscosity of the white sol emulsion is usually 1 to 6 pas.
The application of the cholesteric liquid crystal structure color material in image-text printing is characterized by comprising the following steps:
(1') stirring the cholesteric liquid crystal structural color material (namely the white sol emulsion) uniformly at room temperature (20-30 ℃), adding the defoaming agent into the cholesteric liquid crystal structural color material, and stirring uniformly to obtain the water-based ink;
(2') printing the water-based ink at room temperature (20-30 ℃) and transferring the water-based ink to the surface of a printing substrate to form a printing ink layer, standing for fully volatilizing the moisture contained in the printing ink layer, and fully drying the printing ink layer to form a film.
And (3) after the cholesteric liquid crystal structure color material is prepared, the cholesteric liquid crystal structure color material can be used for preparing the water-based ink in the step (1').
In the step (2'), the water-based ink can be transferred to the surface of the printing substrate through printing screen printing with specific graphic and text information to form a printing ink layer, standing is carried out for waiting for the moisture contained in the printing ink layer to be fully volatilized, and when the printing ink layer is fully dried, the graphic and text information with specific color is formed. The printing screen may be a 50-150 mesh printing screen.
In a preferable scheme, the defoaming agent is ethanol, normal propyl alcohol or isopropyl alcohol, and the addition amount of the defoaming agent is 0.2-1% of the weight of the cholesteric liquid crystal structural color material.
In addition, according to the application requirement, a proper amount of viscosity regulator can be added into the cholesteric liquid crystal structure color material to reduce the viscosity and surface tension of the system. The viscosity modifier may be ethanol.
The substrate may be paper, polymeric film, glass or textile. According to different printing substrate materials, the viscosity and the surface tension of the aqueous printing ink are adjusted by adjusting the addition amount of the viscosity regulator.
Preferably, in the step (2'), the printing ink layer is dried at a temperature of 30 to 90 ℃ for a time of 20 to 180 minutes.
After the printing ink layer is dried to form a film, different colors such as red, orange, yellow, green, cyan, blue, purple and the like can be displayed according to different cholesteric liquid crystal components.
In the preparation of the cholesteric liquid crystal structure color material, the swelling characteristic of a polyvinyl alcohol aqueous solution is utilized, cholesteric liquid crystals are dispersed into a polyvinyl alcohol and cationic starch aqueous solution to form a sol emulsion, a polyvinyl alcohol sol polymer reticular structure can effectively contain a large amount of cholesteric liquid crystals to form a uniformly distributed liquid crystal sol emulsion system, the system has excellent film forming characteristic, and after water is completely volatilized, the liquid crystal structure color material can display relevant image and text information. The cationic starch has better hydrogen bond bonding force, can improve the bonding force of a polyvinyl alcohol sol system, and forms a firmer network cross-linked structure in water.
The cholesteric liquid crystal structure color material and the water-based ink have simple preparation process and low cost, can be applied to the ink, can conveniently adjust the viscosity and the surface tension of the ink, ensure that the water-based ink has excellent printability and film forming property, and can be printed on related substrates by screen printing and other modes, effectively display related color image-text information and realize the presentation of the color information on the printed substrates.
The cholesteric liquid crystal structure color material is a jujube (liquid crystal) -cake (polymer) structure, is not a core (liquid crystal) -shell (polymer) structure in the prior art, mainly utilizes a swelling colloid network structure of polyvinyl alcohol and cationic starch to hold and retain cholesteric liquid crystal, does not need to form microcapsules in the preparation method, can directly form a printable water-based ink system in one step, and simplifies the processing process.
Detailed Description
Example 1
In this embodiment, the method for preparing the cholesteric liquid crystal structural color material includes the following steps:
(1) dissolving 0.62g of polyvinyl alcohol and 0.12g of cationic starch in 6.4g of deionized water (after the polyvinyl alcohol and the cationic starch are added, heating to 95 ℃ and preserving heat for 30 minutes, and simultaneously carrying out continuous stirring by using a mechanical stirring device (the rotating speed of the continuous stirring is 800 rpm) to obtain a uniform polyvinyl alcohol and cationic starch aqueous solution), so as to obtain the polyvinyl alcohol and cationic starch aqueous solution;
(2) adjusting the polyvinyl alcohol and cationic starch aqueous solution to a set temperature (the set temperature is 60 ℃), adding 4.5g of cholesteric liquid crystal into the polyvinyl alcohol and cationic starch aqueous solution, and uniformly stirring (adding the cholesteric liquid crystal, continuing stirring for 10 hours, gradually cooling to 25 ℃, and cooling at a rate of 40 ℃/min) to obtain white sol emulsion, wherein the white sol emulsion is the required cholesteric liquid crystal structural color material. The obtained cholesteric liquid crystal structural color material is sol emulsion formed by uniformly dispersing cholesteric liquid crystals in a polyvinyl alcohol and cationic starch sol system.
The cholesteric liquid crystal used in the step (2) was formed by mixing 1.8g of 4-cyano-4' -pentylbiphenyl and 2.7g of cholesterol carbonate, and its structural color was green at room temperature.
In this embodiment, the application of the cholesteric liquid crystal structure color material to image-text printing includes the following steps:
(1') stirring a cholesteric liquid crystal structure color material (which can be used for preparing water-based ink after the cholesteric liquid crystal structure color material is prepared) uniformly at room temperature, adding a defoaming agent into the cholesteric liquid crystal structure color material, and stirring uniformly to obtain the water-based ink;
in the step (2'), the defoaming agent is ethanol, and the addition amount of the defoaming agent is 0.2% of the weight of the cholesteric liquid crystal structure color material;
(2') printing the water-based ink on the surface of the printing substrate at room temperature to form a printing ink layer, standing for sufficiently volatilizing the moisture contained in the printing ink layer to sufficiently dry the printing ink layer into a film (the drying temperature of the printing ink layer is 30 ℃, and the drying time is 120 minutes).
In the step (1'), a proper amount of viscosity regulator (such as ethanol) can be added into the cholesteric liquid crystal structure color material according to the application requirement so as to reduce the viscosity and the surface tension of the system. For example, the aqueous ink is diluted by adding appropriate ethanol until the solid content of the aqueous ink is 30% and the viscosity of the system is 1.6 pas.
In the step (2'), the aqueous ink can be transferred to the surface of the printing substrate through printing screen printing with specific graphic and text information to form a printing ink layer, standing is carried out for waiting for the moisture contained in the printing ink layer to be fully volatilized, and when the printing ink layer is fully dried, the graphic and text information with specific color is formed. The printing screen may be a 100 mesh printing screen. The substrate may be paper, polymeric film, glass or textile.
After the printing ink layer is dried, a firm polyvinyl alcohol film layer pattern is formed on the surface of the paper. The character and pattern information can exist stably in the air, and is colorless and transparent character and pattern when the observation angle is 0 degrees, and clear green character and pattern can be displayed when the observation angle is 30 degrees.
Example 2
In this embodiment, the method for preparing the cholesteric liquid crystal structural color material includes the following steps:
(1) dissolving 0.64g of polyvinyl alcohol and 0.12g of cationic starch in 5.1g of deionized water (after the polyvinyl alcohol and the cationic starch are added, heating to 93 ℃ and preserving heat for 50 minutes, and simultaneously carrying out continuous stirring by using a mechanical stirring device (the rotating speed of the continuous stirring is 1000 rpm) to obtain a uniform polyvinyl alcohol and cationic starch aqueous solution), so as to obtain the polyvinyl alcohol and cationic starch aqueous solution;
(2) adjusting the polyvinyl alcohol and cationic starch aqueous solution to a set temperature (the set temperature is 55 ℃), adding 5g of cholesteric liquid crystal into the polyvinyl alcohol and cationic starch aqueous solution, and uniformly stirring (adding the cholesteric liquid crystal, continuing stirring for 8 hours, gradually cooling to 20 ℃, and cooling at the rate of 30 ℃/min) to obtain white sol emulsion, wherein the white sol emulsion is the required cholesteric liquid crystal structural color material. The obtained cholesteric liquid crystal structural color material is sol emulsion formed by uniformly dispersing cholesteric liquid crystals in a polyvinyl alcohol and cationic starch sol system.
The cholesteric liquid crystal used in the step (2) was formed by mixing 2.5g of 4-cyano-4' -hexylbiphenyl and 2.5g of cholesterol carbonate, and its structural color was red at room temperature.
In this embodiment, the application of the cholesteric liquid crystal structure color material to image-text printing includes the following steps:
(1') stirring a cholesteric liquid crystal structure color material (which can be used for preparing water-based ink after the cholesteric liquid crystal structure color material is prepared) uniformly at room temperature, adding a defoaming agent into the cholesteric liquid crystal structure color material, and stirring uniformly to obtain the water-based ink;
in the step (2'), the defoaming agent is ethanol, and the addition amount of the defoaming agent is 1% of the weight of the cholesteric liquid crystal structure color material;
(2') printing the water-based ink on the surface of the printing substrate at room temperature to form a printing ink layer, standing for sufficiently volatilizing the moisture contained in the printing ink layer to sufficiently dry the printing ink layer into a film (the drying temperature of the printing ink layer is 80 ℃, and the drying time is 50 minutes).
In the step (1'), a proper amount of viscosity regulator (such as ethanol) can be added into the cholesteric liquid crystal structure color material according to the application requirement so as to reduce the viscosity and the surface tension of the system. For example, the aqueous ink is diluted by adding appropriate ethanol until the solid content of the aqueous ink is 35% and the viscosity of the system is 1.9 pas.
In the step (2'), the aqueous ink can be transferred to the surface of the printing substrate through printing screen printing with specific graphic and text information to form a printing ink layer, standing is carried out for waiting for the moisture contained in the printing ink layer to be fully volatilized, and when the printing ink layer is fully dried, the graphic and text information with specific color is formed. The printing screen can adopt an 80-mesh printing screen. The substrate may be paper, polymeric film, glass or textile.
And after the printing ink layer is dried, forming a polyvinyl alcohol film layer pattern on the surface of the paper. The character pattern information can exist stably in the air, and the character pattern information is red character patterns when the observation angle is 0 degrees, and clear green character patterns are displayed when the observation angle is 30 degrees.
Example 3
In this embodiment, the method for preparing the cholesteric liquid crystal structural color material includes the following steps:
(1) dissolving 0.75g of polyvinyl alcohol and 0.12g of cationic starch in 6.4g of deionized water (after the polyvinyl alcohol and the cationic starch are added, heating to 92 ℃ and keeping the temperature for 25 minutes, and meanwhile, continuously stirring by using a mechanical stirring device (the rotating speed of continuous stirring is 500 rpm) to obtain a uniform polyvinyl alcohol and cationic starch aqueous solution) to obtain the polyvinyl alcohol and cationic starch aqueous solution;
(2) adjusting the polyvinyl alcohol and cationic starch aqueous solution to a set temperature (the set temperature is 65 ℃), adding 5.8 g of cholesteric liquid crystal into the polyvinyl alcohol and cationic starch aqueous solution, and uniformly stirring (adding the cholesteric liquid crystal, continuing stirring for 8 hours, gradually cooling to 30 ℃, and cooling at a rate of 50 ℃/min) to obtain white sol emulsion, wherein the white sol emulsion is the required cholesteric liquid crystal structural color material. The obtained cholesteric liquid crystal structural color material is sol emulsion formed by uniformly dispersing cholesteric liquid crystals in a polyvinyl alcohol and cationic starch sol system.
The cholesteric liquid crystal used in the above step (2) was prepared by mixing 1.8g of 4-cyano-4' -pentylbiphenyl, 2.8g of cholesterol carbonate, and 1.2g of cholesterol acetate.
In this embodiment, the application of the cholesteric liquid crystal structure color material to image-text printing includes the following steps:
(1') stirring a cholesteric liquid crystal structure color material (which can be used for preparing water-based ink after the cholesteric liquid crystal structure color material is prepared) uniformly at room temperature, adding a defoaming agent into the cholesteric liquid crystal structure color material, and stirring uniformly to obtain the water-based ink;
in the step (2'), the defoaming agent is ethanol, and the addition amount of the defoaming agent is 1% of the weight of the cholesteric liquid crystal structure color material;
(2') printing the water-based ink on the surface of the printing substrate at room temperature to form a printing ink layer, standing for sufficiently volatilizing the moisture contained in the printing ink layer to sufficiently dry the printing ink layer into a film (the drying temperature of the printing ink layer is 80 ℃, and the drying time is 60 minutes).
In the step (1'), a proper amount of viscosity regulator (such as ethanol) can be added into the cholesteric liquid crystal structure color material according to the application requirement so as to reduce the viscosity and the surface tension of the system. For example, the aqueous ink is diluted by adding appropriate ethanol until the solid content of the aqueous ink is 40% and the viscosity of the system is 2.5 pas.
In the step (2'), the aqueous ink can be transferred to the surface of the printing substrate through printing screen printing with specific graphic and text information to form a printing ink layer, standing is carried out for waiting for the moisture contained in the printing ink layer to be fully volatilized, and when the printing ink layer is fully dried, the graphic and text information with specific color is formed. The printing screen can adopt an 80-mesh printing screen. The substrate may be paper, polymeric film, glass or textile.
And after the printing ink layer is dried, forming a polyvinyl alcohol film layer pattern on the surface of the paper. The character and pattern information can stably exist in the air, colorless and transparent character and patterns are observed at a full angle under the room temperature condition, and clear orange character and patterns are displayed at an observation angle of 0 degree when the temperature is raised to 41 ℃.
In other embodiments, after the white sol emulsion is obtained in step (2), an emulsion stabilizer may be added to the white sol emulsion, and the mixture may be left to stand at room temperature after being uniformly mixed. The emulsion stabilizer can be sodium carboxymethylcellulose, and the addition amount of the emulsion stabilizer is 0.05-0.3% of the weight of the white sol emulsion.
Claims (10)
1. The cholesteric liquid crystal structure color material is characterized in that the cholesteric liquid crystal structure color material is sol emulsion formed by uniformly dispersing cholesteric liquid crystals in a polyvinyl alcohol and cationic starch sol system.
2. A method of preparing a cholesteric liquid crystal structure color material according to claim 1, comprising the steps of:
(1) dissolving polyvinyl alcohol and cationic starch in water together to obtain a polyvinyl alcohol and cationic starch aqueous solution;
(2) adjusting the polyvinyl alcohol and cationic starch aqueous solution to a set temperature, adding the cholesteric liquid crystal into the polyvinyl alcohol and cationic starch aqueous solution, and uniformly stirring to obtain a white sol emulsion which is a required cholesteric liquid crystal structural color material.
3. A method of preparing a cholesteric liquid crystal structure color material according to claim 2, characterized in that: in the step (1), polyvinyl alcohol and cationic starch are added into water, heated to 92-97 ℃ and kept warm for 20-50 minutes, and simultaneously, a mechanical stirring device is used for continuously stirring to obtain uniform polyvinyl alcohol and cationic starch water solution.
4. A method of preparing a cholesteric liquid crystal structure color material according to claim 2 or 3, characterized in that: in the aqueous solution of the polyvinyl alcohol and the cationic starch obtained in the step (1), the weight percentage content of the polyvinyl alcohol is 8-15%, and the weight percentage content of the cationic starch is 1-5%;
in the step (1), the used water is deionized water;
in the step (1), the used cationic starch is starch etherified by tertiary amino or quaternary ammonium groups.
5. A method of preparing a cholesteric liquid crystal structure color material according to claim 2, characterized in that: the set temperature in the step (2) is 10-15 ℃ higher than the clearing point temperature of the cholesteric liquid crystal;
and (2) adding the cholesteric liquid crystal, continuing stirring for 8-15 hours, and gradually cooling to 20-30 ℃ at a cooling rate of 30-60 ℃/min to obtain the white sol emulsion.
6. A method of preparing a cholesteric liquid crystal structure color material according to claim 2, characterized in that: the cholesteric liquid crystal is formed by mixing a nematic liquid crystal material and a chiral dopant according to the weight ratio of 5-50% of the nematic liquid crystal material to 95-50% of the chiral dopant; the nematic liquid crystal material is one or a mixture of more of 4-cyano-4 '-pentylbiphenyl, 4-cyano-4' -hexylbiphenyl, 4-cyano-4 '-heptylbiphenyl and 4-cyano-4' -octylbiphenyl; the chiral dopant is one or more of cholesteryl formate, cholesteryl acetate, cholesteryl valerate, cholesteryl heptanoate, cholesteryl n-octanoate, cholesteryl decanoate and cholesteryl carbonate.
7. A method of preparing a cholesteric liquid crystal structure color material according to claim 2, characterized in that: the addition amount of the cholesteric liquid crystal is 3-8 times of the weight of the polyvinyl alcohol.
8. Use of a cholesteric liquid crystal structure color material according to claim 1 for graphic printing, comprising the steps of:
(1') stirring the cholesteric liquid crystal structural color material uniformly at room temperature, adding the defoaming agent into the cholesteric liquid crystal structural color material, and stirring uniformly to obtain the water-based ink;
(2') printing the water-based ink on the surface of the printing substrate at room temperature to form a printing ink layer, standing for fully volatilizing the moisture contained in the printing ink layer, and fully drying the printing ink layer to form a film.
9. Use of a cholesteric liquid crystal structure color material according to claim 8, in graphic printing, characterized in that: the defoaming agent is ethanol, normal propyl alcohol or isopropyl alcohol, and the addition amount of the defoaming agent is 0.2-1% of the weight of the cholesteric liquid crystal structure color material.
10. Use of a cholesteric liquid crystal structure color material according to claim 8, in graphic printing, characterized in that: in the step (2'), the drying temperature of the printing ink layer is 30-90 ℃ and the drying time is 20-180 minutes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113248641A (en) * | 2021-06-24 | 2021-08-13 | 广东壮丽彩印股份有限公司 | Variable-temperature anti-counterfeiting material based on structural color and preparation method and application thereof |
| CN113429775A (en) * | 2021-06-24 | 2021-09-24 | 广东壮丽彩印股份有限公司 | UV (ultraviolet) photocuring liquid crystal structure color film and preparation method thereof |
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| GB1390107A (en) * | 1971-06-14 | 1975-04-09 | Hoffmann La Roche | Cholesteric liquid crystals containing materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113248641A (en) * | 2021-06-24 | 2021-08-13 | 广东壮丽彩印股份有限公司 | Variable-temperature anti-counterfeiting material based on structural color and preparation method and application thereof |
| CN113429775A (en) * | 2021-06-24 | 2021-09-24 | 广东壮丽彩印股份有限公司 | UV (ultraviolet) photocuring liquid crystal structure color film and preparation method thereof |
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Application publication date: 20210427 |