CN102529215B - Lamellar liquid crystal composite material and preparation method and application thereof - Google Patents
Lamellar liquid crystal composite material and preparation method and application thereof Download PDFInfo
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- CN102529215B CN102529215B CN201110449531.5A CN201110449531A CN102529215B CN 102529215 B CN102529215 B CN 102529215B CN 201110449531 A CN201110449531 A CN 201110449531A CN 102529215 B CN102529215 B CN 102529215B
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Abstract
The invention provides a lamellar liquid crystal composite material and a preparation method and an application thereof; the lamellar liquid crystal composite material comprises an outer liquid crystal layer, a middle magnetic layer and an inner liquid crystal layer which are sequentially composited; the outer liquid crystal layer and the inner liquid crystal layer are made of lamellar liquid crystal materials, and the middle magnetic layer is made of a magnetic material; and the magnetic material is one or two of a soft magnetic material or a hard magnetic material. According to the material and the preparation method and the application thereof, the simulation cost is high, the material can be used for the magnetic positioning printing of ink, and a printed product has the dynamic characteristics of a scroll bar, simultaneously has significant brightness and darkness characteristics under a circular polarizer and comprehensive counterfeiting performance, and the ink can be significantly distinguished from ordinary colorful ink. Consequently, the printed product is easy to identify and difficult to copy.
Description
Technical field
The present invention relates to a kind of anti-fake material and preparation method thereof, and the anti-forgery ink making with this material, relate in particular to one and there is circular polarization variable color magnetic anti-counterfeit pigment and its preparation method and application.
Background technology
In printing industry, particularly in anti-counterfeit printing field, photochromatic printing ink, liquid crystal ink, as high-end anti-counterfeiting technology, are widely used in banknote, certificate.Along with magnetic location technology is applied in the printing process of high-end false proof field, some have the material that magnetic characteristic has optical signature simultaneously and are just demonstrating a splendid line anti-counterfeiting performance.There is the commercialization of honorable pigment that magnetic characteristic is combined with multi-layer vacuum coating technique, as the Spark ink pigment used of Sicpa company of Switzerland.
But it is the recessive anti-counterfeiting characteristic that does not possess two wires that current material has general defect, therefore can not meet people to the diversified demand of false proof means.
Summary of the invention
The object of the present invention is to provide a kind of layered liquid crystal composite and its preparation method and application, the above-mentioned defect existing to overcome prior art, meets the needs that people are higher to anti-counterfeiting technology.
Layered liquid crystal composite of the present invention, for compound successively outer liquid crystal layer, intermediate magnetic layer and interior liquid crystal layer form;
The material of described outer liquid crystal layer and interior liquid crystal layer is layered liquid crystal material, and intermediate magnetic layer is magnetic material;
The layer thickness of described outer liquid crystal layer is 0.5～8.0 μ m;
The layer thickness of described intermediate magnetic layer is 0.05～2.0 μ m;
The layer thickness of described interior liquid crystal layer is 0.5～8.0 μ m;
The material of described outer liquid crystal layer and interior liquid crystal layer is selected from cholesteric liquid crystal polymers or copolymer, preferred left-handed cholesteric liquid crystal material, dextrorotation cholesteric liquid crystal material or its mixture, and weight average molecular weight is 1000-100000;
Described cholesteryl liquid crystal includes but not limited to chirality methyl aliphatic acid, alkane olefin(e) acid cholesterol ester, cholesterine vegetable oil acid esters or cholesteryl benzoate;
The material of outer liquid crystal layer is the material that same material or chirality are different from the material of interior liquid crystal layer;
Most preferably liquid crystal material is undecenoic acid cholesterol ester, lauroleic acid cholesterol ester, cinnamic acid cholesteryl ester, isobide type cholesteric liquid crystal material, acrylic acid cholesteryl ester and polymer or copolymer, polymer or the copolymer of the chirality methyl aliphatic acid that preferable weight-average molecular weight is 10000-50000.
Described magnetic material is one or both in soft magnetic materials or hard magnetic material, preferably iron, cobalt or nickel, or the oxide of iron, cobalt or nickel, super-microcrystalline soft magnetic alloy, barium ferrite, nichrome, alnico alloy or titanium-cobalt alloy;
The preparation method of described layered liquid crystal composite, comprises the steps:
(1) by cholesteric liquid crystal polymers or copolymer, be heated to 60～350 DEG C, be then coated on base material, film forming, is cooled to room temperature vulcanizing, and the outer thickness of liquid crystal layer after sclerosis is 0.5～8.0 μ m;
(2) on ground floor liquid crystal film, adopt the method for vacuum evaporation, coating intermediate magnetic material, evaporation condition is: vacuum is E-3Pa～E-6Pa, coating thickness is 0.05～2.0 μ m;
(3) by cholesteric liquid crystal polymers or copolymer, be heated to 60～350 DEG C, be coated on the product of step (2), film forming, is cooled to room temperature vulcanizing, and the interior thickness of liquid crystal layer after sclerosis is 0.5～8.0 μ m;
The cholesteric liquid crystal polymers of the cholesteric liquid crystal polymers of step (3) or copolymer and step (1) or copolymer are same material or the different material of chirality;
Described base material is polyamide film, polycarbonate film or polyester film;
(4) product of step (3) is separated with base material, being crushed to median particle diameter is 8～50 μ m, obtains layered liquid crystal composite material, is a kind of pigment.
The invention still further relates to a kind of magnetic liquid crystal optical disclour printing ink that contains layered liquid crystal composite material, wherein, the weight content of layered liquid crystal composite material is 5～50%; Other component of described ink, identical with conventional ink, as the formula that can adopt ink formulations handbook to provide, wherein at least comprise film forming matter, solvent and common agent, the preferred Uv cured acrylate of film forming matter resin;
The preparation method of described magnetic liquid crystal optical disclour printing ink is conventional physical mixed method.
The present invention has following advantage:
Layered liquid crystal composite pigment prepared by the present invention requires height to device parameter, technology difficulty is large, imitation cost is high, liquid crystal composite pigment prepared by the present invention, can be used for the magnetic orientation printing of ink, printing has the behavioral characteristics of scroll bar, be easy to identification, simultaneously under circular polarizing disk, there is obvious light and shadow characteristics, there is integrated anti-counterfeit performance, in ink, comprise ink prepared by least one the present invention by the location of solidifying the magnetic device before dry, give the honorable effect that printed matter has scrolling features, this feature visual effect is obvious, can not be with any photograph, duplicate, the modes such as scanning copy, observe at circular polarizing disk simultaneously, can obviously distinguish this ink and common honorable ink.Therefore give printing file and be easy to identification, the effect that is difficult to copy.
Detailed description of the invention
Embodiment 1
(1) the undecenoic acid cholesterol ester liquid crystal polymer that is 10000 by weight average molecular weight is warming up to 300 DEG C, keeps this temperature to be coated with in resistant to elevated temperatures polyamide substrate, makes its film forming, is cooled to room temperature vulcanizing, molecular orientation, and outer thickness of liquid crystal layer is 2 μ m;
(2) vacuum evaporation intermediate oxidation iron on ground floor liquid crystal film, evaporation condition is: vacuum 3E-3Pa, magnetic coating thickness is 0.2 μ m;
(3) the undecenoic acid cholesterol ester liquid crystal polymer that is 10000 by weight average molecular weight, is warming up to 300 DEG C, keeps this temperature to be coated with in resistant to elevated temperatures polyamide substrate, makes its film forming, is cooled to room temperature vulcanizing, molecular orientation, and interior thickness of liquid crystal layer is 1 μ m;
(4) the trilaminate material film of preparation is above separated with base material, pulverize and make layered liquid crystal composite, median particle diameter is 20 μ m.
The ink being prepared from by traditional ink hybrid mode by above-mentioned layered liquid crystal composite, by the location of the magnetic device before curing being dried, give the honorable effect that printed matter has scrolling features, this feature visual effect is obvious, can not copy in modes such as any photograph, duplicating, scannings, observe at circular polarizing disk simultaneously, can obviously distinguish this ink and common honorable ink.Therefore give printing file and be easy to identification, the effect that is difficult to copy.
Embodiment 2
(1) the left-handed cholesteryl nonanoate liquid crystal material that is 30000 by weight average molecular weight is warming up to 310 DEG C, keeps this temperature to be coated with in polyamide substrate, makes its film forming, is cooled to room temperature vulcanizing, molecular orientation, and outer thickness of liquid crystal layer is 3 μ m;
(2) on ground floor liquid crystal film, vacuum evaporation pure iron material, evaporation condition is: vacuum 1E-4Pa, magnetic coating thickness is 0.5 μ m;
(3) the dextrorotation isobide type cholesteric liquid crystal material that is 30000 by weight average molecular weight is warming up to 310 DEG C, keeps this temperature to be coated with in polyamide substrate, makes its film forming, is cooled to room temperature vulcanizing, molecular orientation, and outer thickness of liquid crystal layer is 3 μ m;
(4) the trilaminate material film of preparation is above separated with base material, pulverize and make layered liquid crystal composite, median particle diameter is 26 μ m.
The ink being prepared from by traditional ink hybrid mode by above-mentioned layered liquid crystal composite, by the location of the magnetic device before curing being dried, give the honorable effect that printed matter has scrolling features, this feature visual effect is obvious, can not copy in modes such as any photograph, duplicating, scannings, observe at circular polarizing disk simultaneously, can obviously distinguish this ink and common honorable ink.Therefore give printing file and be easy to identification, the effect that is difficult to copy.
Claims (2)
1. the method for preparing stratiform liquid crystal composite material, is characterized in that, comprises the steps:
(1) by cholesteric liquid crystal polymers or copolymer, be heated to 60～350 DEG C, be then coated on base material, film forming, is cooled to room temperature vulcanizing, and the outer thickness of liquid crystal layer after sclerosis is 0.5～8.0 μ m;
(2) on ground floor liquid crystal film, adopt the method for vacuum evaporation, coating intermediate magnetic material, evaporation condition is: vacuum is E-3Pa～E-6Pa, coating thickness is 0.05～2.0 μ m;
(3) by cholesteric liquid crystal polymers or copolymer, be heated to 60～350 DEG C, be coated on the product of step (2), film forming, is cooled to room temperature vulcanizing, and the interior thickness of liquid crystal layer after sclerosis is 0.5～8.0 μ m;
(4) product of step (3) is separated with base material, being crushed to median particle diameter is 8～50 μ m, obtains described liquid crystal composite material, for compound successively outer liquid crystal layer, intermediate magnetic layer and interior liquid crystal layer form;
The material of described outer liquid crystal layer and interior liquid crystal layer is layered liquid crystal material, intermediate magnetic layer is magnetic material, described magnetic material is iron, cobalt or nickel, or one or both in the oxide of iron, cobalt or nickel, super-microcrystalline soft magnetic alloy, barium ferrite, nichrome, alnico alloy or titanium-cobalt alloy.
2. a magnetic liquid crystal optical disclour printing ink that contains layered liquid crystal composite prepared by the method for claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110449531.5A CN102529215B (en) | 2011-12-29 | 2011-12-29 | Lamellar liquid crystal composite material and preparation method and application thereof |
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| CN201110449531.5A CN102529215B (en) | 2011-12-29 | 2011-12-29 | Lamellar liquid crystal composite material and preparation method and application thereof |
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| CN102529215A CN102529215A (en) | 2012-07-04 |
| CN102529215B true CN102529215B (en) | 2014-12-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102786840A (en) * | 2012-08-20 | 2012-11-21 | 中钞油墨有限公司 | Optically-variable ink for screen printing |
| CN106282947A (en) * | 2015-05-25 | 2017-01-04 | 中国人民公安大学 | A kind of method preparing film forming based on cholesteryl ester liquid crystal material |
Citations (5)
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| CN1589205A (en) * | 2001-12-21 | 2005-03-02 | 德国捷德有限公司 | Security element for security papers and valuable documents |
| CN101087864A (en) * | 2004-12-16 | 2007-12-12 | 西柏控股有限公司 | Cholesteric monolayers and monolayer pigments with particular properties, their production and use |
| CN101319108A (en) * | 2007-06-07 | 2008-12-10 | 中国印钞造币总公司 | Round-polarization novel printing ink and method of producing the same |
| CN101479353A (en) * | 2006-05-12 | 2009-07-08 | 西柏控股有限公司 | Coating composition for producing magnetically induced images |
| CN101479362A (en) * | 2006-06-27 | 2009-07-08 | 西柏控股有限公司 | Cholesteric multi-layers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006049951A1 (en) * | 2006-10-19 | 2008-04-24 | Giesecke & Devrient Gmbh | Security element for liquid crystal layers |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1589205A (en) * | 2001-12-21 | 2005-03-02 | 德国捷德有限公司 | Security element for security papers and valuable documents |
| CN101087864A (en) * | 2004-12-16 | 2007-12-12 | 西柏控股有限公司 | Cholesteric monolayers and monolayer pigments with particular properties, their production and use |
| CN101479353A (en) * | 2006-05-12 | 2009-07-08 | 西柏控股有限公司 | Coating composition for producing magnetically induced images |
| CN101479362A (en) * | 2006-06-27 | 2009-07-08 | 西柏控股有限公司 | Cholesteric multi-layers |
| CN101319108A (en) * | 2007-06-07 | 2008-12-10 | 中国印钞造币总公司 | Round-polarization novel printing ink and method of producing the same |
Non-Patent Citations (1)
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| 张逸新.磁性油墨的颜料.《防伪印刷原理与工艺》.化学工业出版社,2004,26-29. * |
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Address after: 288 Xiuyan Road, Pudong New Area, Shanghai, 201315 Patentee after: CHINA BANKNOTE INK Co.,Ltd. Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 288 Xiuyan Road, Pudong New Area, Shanghai, 201315 Patentee before: CHINA BANKNOTE INK Co.,Ltd. Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |
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