CN105086627A - Optically variable pigment and manufacturing method thereof - Google Patents
Optically variable pigment and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an optically variable pigment. The optically variable pigment is characterized by comprising a first area and a second area, wherein the first area is flat area with a flat surface and the second area has a sub-wavelength micro relief structure. The invention further discloses a manufacturing method for the optically variable pigment. The method comprises the following steps: providing a substrate; arranging a compression molding layer on one surface of the substrate, wherein the compression molding layer has an area with a sub-wavelength micro relief structure and an area with a flat surface; forming a peeling layer on the compression molding layer, wherein the peeling layer has a sub-wavelength micro relief structure identical to the sub-wavelength micro relief structure of the compression molding layer; depositing at least one pigment coating on the peeling layer in sequence, wherein the pigment coating has a sub-wavelength micro relief structure identical to the sub-wavelength micro relief structure of the peeling layer; dissolving the peeling layer; crushing the pigment coating; and screening the desired optically variable pigment from the crushed pigment coating.
Description
Technical field
The present invention relates to a kind of optically variable pigments and manufacture method thereof.
Background technology
Optically variable pigments (Opticallyvariablepigment, OVP) is a kind of advanced optical anti-fake product, is to manufacture photochromatic printing ink (Opticallyvariableink, OVI) to have the advantages that color changes with viewing angle.When direction of observation is different from the angle of normal, such as 0 ° and 45 °, optically variable pigments will present distinct two kinds of colors.Further, different from conventional color pigment, this kind of optically variable pigments can not be reproduced by conventional pseudo-making methods such as scanner, color reproduction equipment, electronic scanning plate-making and inscription rubbings.Optically variable pigments has multilayer films interference structure, and its production link relates generally to vacuum winding evaporated device, and keeps homogeneity of product to have great difficulty, and production technique is higher, and not easily scale operation is forged.Have easy to identify, difficult feature of forging.Therefore, optically variable pigments, as the effective counterfeit protection measures of one, in the high-end product such as currency, ticket, trade mark of widespread use and various countries, has very effective antifalse effect.
Optically variable pigments is the pigment based on multilayer interference film structure, and its concept head sees in Polaroid company of the U.S. patent of 1978 (US4168986).And really have and use the optically variable pigments of meaning to be by proposing in FLEX company of the U.S. a series of patents subsequently, the typical structure with " absorption layer/medium layer/reflecting layer/medium layer/absorption layer " such as, is proposed in patent US5059245.Because traditional OVP to have had the time of decades as a kind of optically variable pigments, except being applied to the field such as currency, high value security, progressing into ordinary packing, furnishing fields, caused its anti-counterfeit capability to decline to some extent.In order to improve the anti-counterfeit capability of existing OVP, increase new security element and optical signature, people have carried out corresponding improvement to the structure of OVP.In patent US6841238B2, in OVP structure, introduce holographic grating structure, its principal character adds rainbow diffracting effect on the basis that light becomes.But this rainbow diffracting effect easily becomes effect and superposes and mutually disturb with light, reduce public's anti-counterfeit capability.Disclose a kind of preparation method with specific trait OVP in patent CN102504620A, but this specific trait can only can identify after microscope amplifies, and does not increase new optical effect, promotes limited for general public's anti-counterfeit capability.Above-mentioned these improve, all change this anti-counterfeiting characteristic based on existing OVP color with viewing angle change, add a novel line, two wires antifalse effect, its object is keep existing obvious light to become on the basis of effect, provides the optical anti-counterfeiting ability of existing OVP.
Summary of the invention
The object of this invention is to provide a kind of novel texture and manufacture method thereof of optically variable pigments, to realize multiple public optical security features easy to identify, increase expert's anti-counterfeiting characteristic of optically variable pigments simultaneously, promote the anti-counterfeit capability of existing optically variable pigments further.
To achieve these goals, one aspect of the present invention provides a kind of optically variable pigments, and this optically variable pigments comprises first area and second area, and described first area is surperficial smooth flat site, and described second area has sub-wavelength micro relief profile.
Another aspect of the present invention provides a kind of manufacture method of optically variable pigments, and the method comprises:
Base material is provided; Arrange compression molding layer on the surface at one of described base material, this compression molding layer has the smooth region in the region of sub-wavelength micro relief profile and surface; Described compression molding layer forms peel ply, and this peel ply has the sub-wavelength micro relief profile identical with described compression molding layer; Described peel ply deposits at least one pigment coating successively, and this pigment coating has the sub-wavelength micro relief profile identical with described peel ply; Dissolve described peel ply; Pulverize described pigment coating; And required optically variable pigments is screened from pulverized pigment coating.
Pass through technique scheme, sub-wavelength micro relief profile in described optically variable pigments has the first-order diffraction of wide-angle, bright color information can be provided, particularly become membrane structure with light when combining, make up light and become the membrane structure defect that colouring information declines under wide-angle., combine with sub wavelength micro structure meanwhile, other diffracted raies can be avoided the color interference under Small angle, make OVP keep the color of easy description easy to identify when viewing angle changes.When using microscope to observe optically variable pigments particle, flat site and the micro-embossment region of sub-wavelength have obvious color distinction, can as the false proof function of expert, raising anti-counterfeit capability.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the schematic diagram of the optically variable pigments according to one embodiment of the present invention;
Fig. 2 is the sectional view of the optically variable pigments according to one embodiment of the present invention;
Fig. 3 is the sectional view of the optically variable pigments according to another embodiment of the present invention;
Fig. 4 is the sectional view of the optically variable pigments according to another embodiment of the present invention;
Fig. 5 is the dispersion schematic diagram of the optically variable pigments according to one embodiment of the present invention;
Fig. 6 is a kind of lift-off layer structure related in the manufacture method of a kind of optically variable pigments of the present invention;
Fig. 7 is the another kind of lift-off layer structure related in the manufacture method of a kind of optically variable pigments of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of optically variable pigments and manufacture method thereof, to realize multiple public optical security features easy to identify, increase expert's anti-counterfeiting characteristic of optically variable pigments simultaneously, promote the anti-counterfeit capability of existing optically variable pigments further.
According to the embodiment of the present invention, provide a kind of optically variable pigments, this optically variable pigments comprises first area and second area.Described first area is surperficial smooth flat site, and described second area has sub-wavelength micro relief profile.Described flat surfaces and sub-wavelength micro relief profile have at least the first coating, or assembly of thin films structure.When the normal angle (such as 0-60 °) within the scope of certain angle of viewing angle and optically variable pigments, along with viewing angle change, optically variable pigments presents the change of color; As viewing angle and optically variable pigments normal angle in other angular ranges (such as 60-90 °), along with viewing angle change, optically variable pigments, except having colour-change, also has bright diffracting effect.When using microscopic examination, the first area on optically variable pigments particle and second area have visibly different color and brightness difference.
By adjusting the coating material of optically variable pigments particle first area and second area, other effects can also be produced.
According to an embodiment of the invention, a kind of manufacture method of optically variable pigments is provided, comprise: (a) provides a kind of base material, base material has smooth first area and there is the second area of sub-wavelength micro relief profile, b () deposits peel ply and pigment coating on the substrate successively, c () dissolves peel ply, so that pigment coating is peeled off from base material, d pigment coating is ground into optically variable pigments particle by ultrasonic by (), and (e) screens size.
Above-mentioned pigment coating can be multi-coated interference coating, namely multi-coated interference membrane structure all can be deposited on described base material, form required optically variable pigments by follow-up stripping, screening technology, multi-coated interference membrane structure can comprise such as " absorption layer/medium layer/reflecting layer/medium layer/absorption layer ", " medium layer/metal level/medium layer ", the symmetrical structure such as " medium layer/medium layer/medium layer ".Even single-layer metal or unsymmetric structure also can be combined to form the optically variable pigments with specific light sex change energy with the sub-wavelength micro relief profile on described base material.When coating structure is interfere type multi-layer film structure, itself interference cavity resonator structure and sub-wavelength micro relief profile phase inter-modulation, form other colors being different from simple multi-layer film structure intrinsic colour, two kinds of colors on flat site and sub-wavelength micro relief profile region mix superposition mutually, form new color.Because the modulation of sub-wavelength micro relief profile to color depends on incident light and viewing angle, therefore when viewing angle changes, can there is obvious change in the color of optically variable pigments, such as, become green from carmetta thereupon.When viewing angle is larger, such as be greater than 60 °, membrane structure is become for traditional light, the chroma of its color and brightness have very large decline, color is comparatively dim, and the sub-wavelength micro relief profile in described structure has the first-order diffraction of wide-angle, bright color information can be provided, make up light and become the membrane structure defect that colouring information declines under wide-angle., combine with sub wavelength micro structure meanwhile, other diffracted raies can be avoided the color interference under Small angle, make OVP keep the color of easy description easy to identify when viewing angle changes.For single-layer metal or dielectric material, above-mentioned colour-change function can realize equally, and further simplify production technique.When using microscope to observe metallic particles, flat site and the micro-embossment region of sub-wavelength have obvious color distinction, can as the false proof function of expert, raising anti-counterfeit capability.
Specifically, Fig. 1 shows the structural representation of the optically variable pigments (particle) 1 according to one embodiment of the present invention, and this optically variable pigments 1 comprises first area 2 and second area 3.Region 2 can be flat surfaces (the micro-embossment region of non-sub-wavelength), and region 3 has sub-wavelength micro relief profile.Region 2 can be identical with the composition material in region 3, such as, be one or more layers coating structure, also can not be identical.The color of optically variable pigments 1 changes with viewing angle difference.When viewing angle and optically variable pigments 1 normal angle change in range of observation 11, the color of optically variable pigments 1 changes with the change of viewing angle.When viewing angle and optically variable pigments normal angle change in range of observation 12, the colour brightness in region 2 and chroma decline obviously, and region 3 exists first-order diffraction light, has bright color, presents the optical effect different from range of observation 11.Region 2 and/or region 3 can form specific word or figure.Under microscopic visualization, region 2 and region 3 present distinct colors, and such as can present word " A " clearly, this as expert's security element, can add the anti-counterfeiting characteristic of optically variable pigments, improve anti-counterfeit capability.
Figure 2 shows that the sectional view of optically variable pigments 1 in Fig. 1, wherein, this pigment 1 comprises smooth first area 2, surface and sub-wavelength micro relief profile region 3 (second area).Region 2 can have symmetrical structure, such as, comprise coating 21, coating 22, coating 23, coating 22, coating 21 successively.Region 3 can have symmetrical structure, such as, comprise coating 31, coating 32, coating 33, coating 32, coating 31 successively.
Wherein, coating in region 2 and region 3 can have traditional optically variable pigments structure, coating 21 can be absorption layer, can be that chromium, nickel, copper, cobalt, titanium, vanadium, tungsten, tin, silicon, germanium and composition thereof formed with alloy, and its thickness can be 2nm-30nm.Coating 22 can be the medium layer for generation of optical path modulation, the low refractive index dielectric material that can be less than 1.8 by specific refractory power forms, can be such as any materials in silicon-dioxide, magnesium fluoride, sodium aluminum fluoride, aluminum oxide or its combination, thickness be 100-1000nm.Coating 23 is reflecting layer, is made up of the material with high reflectance, and can be any materials in gold and silver, copper, aluminium, silicon or its combination, thickness be greater than 20nm.
Coating structure in region 2 and region 3 can also be color coating structure, coating 21 is identical with optically variable pigments composition material with coating 23, the high-index material that medium layer 22 can be greater than 1.8 by specific refractory power is formed, can be any materials in zinc sulphide, titanium nitride, titanium oxide, thallium oxide, niobium oxides, cerium oxide, bismuth oxide, chromic oxide and ferric oxide or its combination, thickness 50-500nm.
In region 2 and region 3, coating structure can also be multilayered medium interference structure, and coating 21 and coating 23 are high-index material, and coating 22 is low-index material.
Coating structure in region 2 and region 3 can be unsymmetric structure.
The groove depth of the sub-wavelength embossment structure 30 at region 3 place is variable, and namely in whole region 3, groove depth can not be uniform.Described groove depth can be positioned at the scope of 10nm to 500nm, is preferably placed in the scope of 50nm to 300nm.In addition, the grooved of described sub-wavelength embossment structure 30 is variable, and such as, it can be sinusoidal, rectangle, zig-zag etc., and can be one-dimensional grating and/or two-dimensional grating.The grid distribution of described two-dimensional grating can be one in orthohormbic structure, honeycomb structure, two-dimentional Bravais lattice structure, random structure or its combine or other structures.In addition, the characteristic dimension of described sub-wavelength embossment structure 70 on the first direction (such as x direction) and/or second direction (such as y direction) of such as this structural plan can be 50nm to 500nm, is preferably 200nm to 400nm.Alternatively, when the characteristic dimension on a direction meets the demands, the characteristic dimension on other direction can not by the restriction of above-mentioned scope.
Wherein, the optical signature of the assembly of thin films structure in region 2 can carry out accurate calculation by the method for admittance matrix.The intensity of Maxwell Equation for Calculating Electric and magnetic fields vector through each layer and each interface and phase change can be utilized, and consider final condition, to obtain the phase differential and strength variation parameter that metal and each layer of medium and all circles produce in the face of light.During concrete calculating, single coating or multilayer coating can be thought of as virtual equivalent interface with its interface, the full detail, the particularly variation relation of intensity wavelength that light propagates in coating is obtained, i.e. the reflection spectrum of coating by the eigenmatrix of calculation combination admittance and rete.Finally by reflection spectrum and tristimulus values function being carried out the color coordinates in CIE color space that integration obtains coating.Above process can utilize existing business software to carry out analog calculation.
For assembly of thin films structure in region 3 and the combined situation of sub-wavelength micro relief profile, rigorous coupled wave method (RCW), Finite-Difference Time-Domain Method (FDTD) isovector diffraction theory need be utilized, in conjunction with Boundary Condition for Solving maxwell equation group.Though Vector Diffraction Theory has detailed discussion (" micro-optic and system " in the literature, poplar state light is write, press of Zhejiang University), but due to the complex characteristics of microstructure, coating structure, materials optical parameter and boundary condition, also there is no a general, that function is complete calculating design software at present.Existing business software such as Rsoft, Gsolver, Optiwave etc. are confined to solve a certain or several concrete problem.Therefore, need from basic theories, according to the particular case of problem and optical signature algorithm for design, program calculation will be realized, finally determine each side design variable, the groove depth of such as sub-wavelength embossment structure, grooved, dutycycle and x direction or/and characteristic dimension on y direction, according to the number of plies and each layer thickness, metallic substance, dielectric material, the substrate material etc. of coating of the present invention.
In an embodiment of the invention, in region 3, sub-wavelength micro relief profile 30 can be one-dimensional grating, its cycle can be such as 3100 lines/mm, the degree of depth can be such as 170nm, and in region 2, coating 21 can be metallic nickel, and thickness can be such as 6nm, coating 22 can be such as dielectric material magnesium fluoride, thickness can be such as 450nm, and coating 23 can be such as metallic aluminium, and thickness can be such as 20nm.Region 2 presents carmetta, and region 3 presents grey.When the angle of direction of observation and normal is 0 °, this optically variable pigments presents carmetta, and when viewing angle is increased to 50 °, the color of optically variable pigments becomes green.When viewing angle continues to be increased to 70 °, the color that region 2 presents is comparatively dark, and region 3 presents comparatively bright first-order diffraction.When using microscopic examination optically variable pigments 1, can observe region 2 clearly and present bright carmetta, region 3 presents grey, there is significantly contrast between the two.
Figure 3 shows that another embodiment of the present invention, in region 3, sub-wavelength micro relief profile 30 is two-dimensional grating, the cycle of its first direction (x direction) can be such as 2900 lines/mm, the cycle of second direction (y direction) can be such as 3100 lines/mm, the degree of depth can be such as 100nm, and in region 2, coating 23 can be metallic copper, and thickness can be such as 60nm, coating 22 can be dielectric material titanium dioxide, and thickness can be such as 117nm.Region 2 presents golden yellow, and region 3 presents blueness.When the angle of direction of observation and normal is 0 °, this optically variable pigments presents golden yellow, and when viewing angle is increased to 50 °, the color of optically variable pigments becomes green.When viewing angle continues to be increased to 70 °, the color that region 2 presents is comparatively dark, and region 3 presents comparatively bright first-order diffraction.When using microscopic examination optically variable pigments 1, can observe region 2 clearly and present bright golden yellow, region 3 presents blueness, there is significantly contrast between the two.
Fig. 4 shows another embodiment of the present invention, in region 3, sub-wavelength micro relief profile 30 can be one-dimensional grating, the cycle of its first direction (x direction) can be such as 3750 lines/mm, the degree of depth can be such as 100nm, in region 2, coating 22 can be zinc sulphide, and thickness can be such as 150nm.Region 2 presents carmetta, and region 3 presents redness.When the angle of direction of observation and normal is 0 °, this optically variable pigments presents carmetta, and when viewing angle is increased to 50 °, the color of optically variable pigments becomes yellow.When viewing angle continues to be increased to 70 °, the color that region 2 presents is comparatively dark, and region 3 presents comparatively bright first-order diffraction.When using microscopic examination optically variable pigments 1, can observe region 2 clearly and present bright carmetta, region 3 presents redness, there is significantly contrast between the two.
In replaceable embodiment of the present invention, in region 3, sub-wavelength micro relief profile 30 can be the combination of one-dimensional grating and two-dimensional grating structure.
Fig. 5 shows an example of optically variable pigments 1 discrete form that embodiments of the present invention relate to.Due to the out-of-shape of granules of pigments 1, in ink position, towards stochastic distribution, after depositing to other base materials, the direction of granules of pigments 1 is also random.Region 3 in granules of pigments 1 has sub-wavelength micro relief profile, and when wide-angle, it has bright first-order diffraction light.This diffraction light is that tool is directive.Such as one dimension sub-wavelength micro relief profile, when direction of observation is vertical with sub-wavelength micro relief profile direction, first-order diffraction is obvious; When direction of observation is parallel with sub-wavelength micro relief profile direction, first-order diffraction intensity is not high, not easily observes.When pigment 1 is randomly dispersed on carrier, the direction due to pigment 1 is random, therefore all directions all can observe first-order diffraction light, is convenient to the public and identifies.
The present invention also provides a kind of method manufacturing optically variable pigments, and Fig. 6 is the schematic diagram of each several part in this kind of method, and the method can comprise step:
S61: provide base material 5, described base material 5 can comprise first surface 51 and second surface 52.Described first surface 51 has compression molding layer 4, and compression molding layer 4 subregion forms sub-wavelength micro relief profile 42, such that the subregion of described compression molding layer is described sub-wavelength micro relief profile 42, subregion is plane surface structure 41.
Wherein, described base material 5 is formed by least one material be selected from poly terephthalic acid diol ester, polyvinyl chloride, polyethylene, polycarbonate and polypropylene.
Wherein, the mode that the sub-wavelength micro relief profile on described shape layer 4 can interfere exposure, laser scribing exposure or electron beam directly to be carved by double laser beams is formed, or carries out batch duplicating by the mode of ultraviolet cast, mold pressing, nano impression.Such as, sub-wavelength micro relief profile can pass through the methods such as holographic interferometry, laser scribing technology, electron beam lithography and manufacture mother matrix, is made working version by electroforming process, is transferred on base material by production technique such as mold pressing, UV copy.
Wherein, the material of compression molding layer 4 can be UV curing polyester acrylic resin, epoxy acrylic resin.
S62: simultaneously form peel ply 24 on sub-wavelength micro relief profile region 42 and plane surface structure region 41.
Wherein, because optically variable pigments provided by the invention has sub-wavelength micro relief profile, therefore peel ply must observe the principle that homotype covers on shape layer, and after namely covering shape layer, peel ply will keep the pattern of sub-wavelength micro relief profile in shape layer equally.Therefore, the method for traditional wet coating can not be taked, but can be formed by the mode of the physical vapor depositions such as thermal evaporation, electron beam evaporation, magnetron sputtering or chemical vapour deposition.
Wherein, peel ply material can comprise the inorganic salts such as muriate, fluorochemical, is characterized in be deposited by above-mentioned means, and can form homotype covering, keeps original sub-wavelength micro relief profile of substrate forming layer.And soluble in water, be easy to subsequent technique and peel off.
S63: deposit corresponding coating 21,22,23,22,21 on peel ply 24 successively, forms film interference structure.But those skilled in the art will be appreciated that the material of coating and film structure can be not limited to 5 Rotating fields in Fig. 6.Equally, the principle covered to keep homotype, these coating need to be formed by the mode of the physical vapor depositions such as thermal evaporation, electron beam evaporation, magnetron sputtering or chemical vapour deposition.
S64: put together with each layer by base material 5 and soak in a solvent, dissolves peel ply, obtains the dye film formed by coating, above-mentioned dye film is carried out ultrasonication.The size of optically variable pigments can be controlled by ultrasonic power and ultrasonic time.
The feature of above-mentioned manufacture method is to adopt winding evaporated device, carries out large scale continuous prod, avoids the problem that the production efficiency that uses Laboratary type bell-jar vacuum evaporation equipment frequently to vacuumize to cause is low.Adopt metal chloride, fluorochemical as peel ply, water can be used as peeling off solvent accordingly, avoid with an organic solvent as peeling off the problem that the solvent consequent is fire-proof and explosion-proof and pollute, adopt vacuum evaporation mode to carry out the deposition of peel ply simultaneously, the peel ply that homotype covers can be formed, keep sub-wavelength micro relief profile in shape layer.After optically variable pigments is peeled off, base material and compression molding layer can reuse, cost-saving, enhance productivity.
The present invention also provides the another kind of method manufacturing optically variable pigments, and Fig. 7 is the schematic diagram of each several part in this kind of method, and the method can comprise step:
S71: provide base material 5, described base material 5 comprises first surface 51 and second surface 52.Described first surface 51 has compression molding and becomes 4, compression molding layer 4 subregion forms sub-wavelength micro relief profile 42, and make the subregion of described compression molding layer be described sub-wavelength micro relief profile 42, subregion is plane surface structure 41.
Wherein, described base material is formed by least one material be selected from poly terephthalic acid diol ester, polyvinyl chloride, polyethylene, polycarbonate and polypropylene.
Wherein, the mode that the sub-wavelength micro relief profile on described shape layer 4 can interfere exposure, laser scribing exposure or electron beam directly to be carved by double laser beams is formed, or carries out batch duplicating by the mode of ultraviolet cast, mold pressing, nano impression.Such as, sub-wavelength micro relief profile can pass through the methods such as holographic interferometry, laser scribing technology, electron beam lithography and manufacture mother matrix, is made working version by electroforming process, is transferred on base material by production technique such as mold pressing, UV copy.
Wherein, the material of compression molding layer 4 can be acrylic resin, methacrylic resin.
S72: deposit corresponding coating 21,22,23,22,21 successively on described sub-wavelength micro relief profile region 42 and plane surface structure region 41, to form film interference structure.But it will be understood by those skilled in the art that the material of coating and film structure can be not limited to 5 Rotating fields in Fig. 7.Equally, the principle covered to keep homotype, these coating need to be formed by the mode of the physical vapor depositions such as thermal evaporation, electron beam evaporation, magnetron sputtering or chemical vapour deposition.
S73: put together with each layer by base material 5 and soak in a solvent, dissolves compression molding layer, to obtain the dye film formed by coating, above-mentioned dye film is carried out ultrasonication.The size of optically variable pigments can be controlled by ultrasonic power and ultrasonic time.
The feature of this manufacture method resides in reduced the process of evaporation peel ply, further simplify manufacturing process, has saved the cost of deposition material.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. an optically variable pigments, is characterized in that, this optically variable pigments comprises first area and second area, and described first area is surperficial smooth flat site, and described second area has sub-wavelength micro relief profile.
2. optically variable pigments according to claim 1, the scope of the groove depth of wherein said sub-wavelength micro relief profile is 10nm to 500nm.
3. optically variable pigments according to claim 1, wherein, the groove depth in described second area is variable.
4. optically variable pigments according to claim 1, wherein, described first area and/or second area are made up of a medium layer or a reflecting layer.
5. optically variable pigments according to claim 1, wherein, described first area and/or second area are multilayered structures, and this multilayered structure comprises at least one reflecting layer, at least one medium layer be close to described reflecting layer.
6. light according to claim 5 becomes material, and wherein, described multilayered structure also comprises at least one absorption layer be close to described medium layer.
7. light according to claim 1 becomes material, and wherein, described sub-wavelength micro relief profile can be the combination of one-dimensional grating structure, two-dimensional grating structure or one-dimensional grating structure and two-dimensional grating structure.
8. a manufacture method for optically variable pigments, the method comprises:
Base material is provided;
Arrange compression molding layer on the surface at one of described base material, this compression molding layer has the smooth region in the region of sub-wavelength micro relief profile and surface;
Described compression molding layer forms peel ply, and this peel ply has the sub-wavelength micro relief profile identical with described compression molding layer;
Described peel ply deposits at least one pigment coating successively, and this pigment coating has the sub-wavelength micro relief profile identical with described peel ply;
Dissolve described peel ply;
Pulverize described pigment coating; And
Required optically variable pigments is screened from pulverized pigment coating.
9. method according to claim 8, wherein, it is realized by least one method in thermal evaporation deposition process, electron-beam evaporation method, magnetron sputtering deposition method that described compression molding layer is formed peel ply.
10. method according to claim 8, wherein, it is realized by least one method in thermal evaporation deposition process, electron-beam evaporation method, magnetron sputtering deposition method that described peel ply deposits at least one pigment coating successively.
11. methods according to claim 8, wherein, are pulverized described pigment coating and are realized by ultrasonication.
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| CN111132851B (en) * | 2017-09-22 | 2021-11-09 | 捷德货币技术有限责任公司 | Flake pigment, printing ink, anti-counterfeiting element and production method |
| CN110001234A (en) * | 2018-01-05 | 2019-07-12 | 中钞特种防伪科技有限公司 | Optical anti-counterfeit element and optical anti-counterfeiting product |
| CN109673116A (en) * | 2018-12-17 | 2019-04-23 | 佛山市易晟达科技有限公司 | A kind of anti-dazzle cover board |
| CN109849439A (en) * | 2018-12-17 | 2019-06-07 | 佛山市易晟达科技有限公司 | A kind of cover board |
| CN112848742A (en) * | 2019-11-27 | 2021-05-28 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element and optical anti-counterfeiting product |
| CN110893732A (en) * | 2019-12-20 | 2020-03-20 | 公安部交通管理科学研究所 | Anti-fake certificate card and its making process |
| CN110893732B (en) * | 2019-12-20 | 2023-07-28 | 公安部交通管理科学研究所 | Anti-fake card and its making process |
| CN114891367A (en) * | 2021-01-26 | 2022-08-12 | 中钞特种防伪科技有限公司 | Flaky optical pigment, preparation method thereof and anti-counterfeiting element |
| US20240076501A1 (en) * | 2021-01-26 | 2024-03-07 | Zhongchao Special Security Technology Co., Ltd | Flaky Optical Pigment, Preparation Method thereof and Anti-Counterfeiting Element |
| CN112987158A (en) * | 2021-04-09 | 2021-06-18 | 广东晟铂纳新材料科技有限公司 | Iron-based optically variable pigment and manufacturing method and application thereof |
| CN112987158B (en) * | 2021-04-09 | 2022-03-18 | 广东晟铂纳新材料科技有限公司 | Iron-based optically variable pigment and manufacturing method and application thereof |
| CN114103538A (en) * | 2021-10-12 | 2022-03-01 | 维达力实业（赤壁）有限公司 | Coating film with prefabricated structure, powder and preparation method thereof |
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Application publication date: 20151125 |