CN103351705A - Preparation method of liquid crystal anti-counterfeit pigment - Google Patents
Preparation method of liquid crystal anti-counterfeit pigment Download PDFInfo
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- CN103351705A CN103351705A CN2013102313650A CN201310231365A CN103351705A CN 103351705 A CN103351705 A CN 103351705A CN 2013102313650 A CN2013102313650 A CN 2013102313650A CN 201310231365 A CN201310231365 A CN 201310231365A CN 103351705 A CN103351705 A CN 103351705A
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Abstract
The invention relates to a preparation method of a liquid crystal anti-counterfeit pigment, and belongs to the field of liquid crystal anti-counterfeit pigment. According to the invention, a polymerizable liquid crystal mixture is adopted, wherein the liquid crystal mixture shows a specific single color within a certain temperature range; a photo-initiator, a thermal polymerization inhibitor, and a solvent are added to the polymerizable liquid crystal mixture; the mixture is uniformly mixed, such that a paste-type coating liquid is obtained; the coating liquid is coated on a plastic substrate processed with an orientation treatment; the temperature is maintained within the above range; and ultraviolet radiation is carried out, such that a target liquid crystal pigment film is prepared; and the film is peeled and crushed, such that pigment particles used in printing ink is obtained. An anti-counterfeit label printed by using the pigment provided by the invention has an obvious optical variable effect from different observation angles, wherein the effect is visible to naked eyes. The anti-counterfeit effect cannot be copied.
Description
Technical field
The present invention relates to a kind of preparation method of liquid crystal security pigment, belong to liquid crystal security pigment field.
Background technology
At present, the optical color variable pigment technology is used in the application of anti-counterfeiting ink and anti-forgery ink more and more, is used for the false proof of file and product.These technology have adopted optical interference techniques, so that the color effects that optical reflection produces changes along with the variation of viewing angle.This class pigment comprises inorganic and pigment dyestuff two classes, and they differ from one another in performance, and its optical property is used in false proof aspect.Therefore this technology, has stronger anti-copy function, thereby has guaranteed the verity of product because color changes with angle and has splendid metalluster and metachrosis.
The existing color of cholesteric liquid crystal pigment is with the function that angle changes, and has again the characteristic of the peculiar left-handed and dextrorotation of unique polarization characteristic and chiral molecules, therefore possessed the latent space in the uniqueness development in false proof field.Along with continuous improvement and the development of these technology, in conjunction with the printing graphic design change programme, will take the course of its own in false proof field.
Choles phase liquid crystal high-molecular can form lamellar pigment, and the same effect of the pigment that the inorganic film coating method of development is produced before having namely can be accomplished fantasy coloured effect, but it has again own original one side, and namely liquid crystal pigment has the circularly polarized light reflecting effect.Therefore, except providing from ultraviolet, visible until the modulation to light wave of infrared wavelength range, liquid crystal material can also be by the polarization means, and the false proof means of other uniqueness are provided by selective reflection and transmission.When its as the pigment in the anti-forgery ink, in conjunction with the variation of printing graphic design scheme, just can provide more multifarious, false proof means flexibly.
Summary of the invention
The object of the present invention is to provide a kind of novel process preparation method with liquid crystal optical anti-counterfeiting pigment of obvious color change.
A kind of preparation method of liquid crystal security pigment comprises the steps:
(1) adopt the polymerizable liquid-crvstalline mixture, this liquid crystal compound demonstrates specific solid color in certain temperature range;
(2) in the polymerizable liquid-crvstalline mixture, add light trigger, hot stopper and solvent obtain the coating fluid of paste after mixing, then be applied on the plastics base through orientation process, insulation prepares the Object LC dye film by the radiation UV-light in the said temperature interval;
(3) the above-mentioned film for preparing obtains the printing-ink granules of pigments through peeling off, pulverizing.
In the step (1), described polymerizable liquid-crvstalline mixture is mixed to get by nematic liquid crystal molecule, chiral liquid crystal and/or non-liquid crystal molecule; Described temperature range can be between room temperature～120 ℃.
In the step (1), described polymerizable liquid-crvstalline mixture contains a kind of in following three compounds at least:
A) with the nematic liquid crystal monomer of one or more polymerizable reactive groups;
B) with one or without the liquid crystal monomer of polymerizable reactive group;
C) with one or more or without the photolytic activity chiral molecules that has liquid crystal liquid crystal property or do not have liquid crystal liquid crystal property of polymerizable reactive group.
In the step (1), described polymerizable liquid-crvstalline mixture contains one or more in the following compound at least:
Compound 1:
Compound 2:
Compound 3:
Compound 4:
Compound 5:
Compound 6:
Compound 7:
Compound 8:
Compound 9:
Compound 10:
Compound 11:
In the step (2), the various plastics films of described base for processing through rubbing, such as PET (polyethylene terephthalate), PVC (polyethylene), PP (polypropylene), PI (polyimide) etc.
In the step (2), described light trigger is 1, the acyl group phosphorous oxides, as: (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide (Darocur TPO), phenyl two (2,4,6-trimethylbenzoyl) phosphine oxide (Iragacure819); 2, bitter almond oil camphor and derivative, as: st-yrax, benzoin dimethylether (Iragacure651), Benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether; 3, benzil class, as: 2-methyl isophthalic acid-(4-methylthio group phenyl)-2-morpholinyl-1-acetone (Iragacure907), 1-hydroxy-cyclohexyl benzophenone (Iragacure184), 2-hydroxyl-4'-(2-hydroxy ethoxy)-2-methyl phenyl ketone (Iragacure2959), 2-benzyl-2-dimethylamino-1-(4-morpholinyl phenyl) butanone (Iragacure369); 4, cationic, as: two 2,6-two fluoro-3-pyrroles phenyl two luxuriant titaniums (Iragacure784); The add-on of light trigger is 0～5wt.%.
Described hot stopper is the TBHQ(2-Tert. Butyl Hydroquinone), BHT(2,6-di-tert-butyl-4-methy phenol), the HQ(Resorcinol), HQMME (p methoxy phenol), 2,5-DTBHQ(2, the 5-ditert-butylhydro quinone), its add-on is generally 0～1wt.%.
Described solvent is methylene dichloride, trichloromethane, tetrahydrofuran (THF), acetone, Virahol, butanone, add an amount of solvent and make polymerizable liquid-crvstalline mixture, light trigger and hot stopper dissolve complete, mix, and then remove the coating fluid that partial solvent forms paste.
Above-claimed cpd 1, compound 2, compound 3 and compound 4 can be simultaneously as the linking agent of liquid crystal compound; In the polymerizable liquid-crvstalline mixture, also can add other linking agent, such as PETA (pentaerythritol triacrylate), TMPTA (propyl group three methyl alcohol triacrylates), HDDA (hexanediyl ester).
By adjusting proportioning and the temperature range of various compounds in the polymerizable liquid-crvstalline mixture, obtain having the liquid crystal pigment film of different main (facing) reflection wavelengths; Can obtain the liquid crystal pigment film of left-handed characteristic or dextrorotation characteristic by the type of adjusting chiral molecules in the polymerizable liquid-crvstalline mixture.
Advantage of the present invention:
The present invention will be by adopting different mixed system liquid crystal compounds, adopt certain means to be coated on the treated base, can produce distinct colors and different circularly polarized light (left-handed or dextrorotation) in suitable temperature through after the special processing, then with the UV optical radiation certain hour of certain energy so that distinct colors and polarization effect are fixed up, then be crushed into the optical anti-counterfeiting pigment that anti-forgery ink can be used by certain treatment process.Use the anti-counterfeiting label decorations of this kind processing that pigment is printed to have macroscopic obvious different observation angle optic metachromatic effects, observation has the effect shown in accompanying drawing 1-2 under polaroid, and these antifalse effects can't obtain by copying.
Description of drawings
Fig. 1-1 is the polaroid synoptic diagram, and the left side is the dextropolarization sheet, and the right side is the left-hand polarization sheet.
Fig. 1-2 is the effect synoptic diagram that the liquid crystal compound of embodiment 1 is observed under polaroid at the film behind the photocuring on the PET film.
Fig. 2 is the effect synoptic diagram that the liquid crystal compound of embodiment 10 is observed under polaroid at the film behind the photocuring on the PET film.
Embodiment
The preparation method of liquid crystal security pigment of the present invention adopts a kind of at a certain temperature polymerizable liquid-crvstalline mixture, and this liquid crystal compound can demonstrate specific solid color in this temperature range; Mix by a certain percentage nematic liquid crystal monomer, chiral liquid crystal or non-liquid crystal molecule, light trigger, hot stopper and solvent, adjust to the suitable temp section at suitable base, adjust the amount of light trigger and the hot stopper of adding, by obtaining the Object LC dye film behind a certain amount of UV light of radiation certain hour; After film preparation, adopt suitable means to peel off, be ground into the printing-ink granules of pigments.
Obtain having the different liquid crystal pigment films of leading (facing) reflection wavelengths by the proportioning of adjusting different compounds in the polymerizable liquid-crvstalline mixture with different temperature.Can obtain the liquid crystal pigment film of left-handed characteristic or dextrorotation characteristic by the type of adjusting chiral molecules in the polymerizable liquid-crvstalline mixture.
Further specify implementation procedure of the present invention below in conjunction with the implementation example:
Annotate: in following examples, except specified otherwise, used temperature all is degree centigrade that all proportions all by percentage to the quality.
Below be preparation liquid crystal pigment required compound among the embodiment:
Compound 1:
Compound 2:
Compound 3:
Compound 7:
Compound 8:
Compound 9:
Compound 10:
Compound 11:
Below by several groups of preparation process of testing to specify liquid crystal security pigment of the present invention, first group of experiment adopt compound 1,7,8 and 9(embodiment 1-4), second group of experiment adopt compound 3,7,8 and 10(embodiment 5-8), the 3rd group of experiment adopt compound 1,7,8 and 11(embodiment 9-11).
Embodiment 1:
According to following proportioning, the preparation liquid crystal compound:
Compound 1:29.49%
Compound 7:43.94%
Compound 8:11.18%
Compound 9:11.23%
Light trigger Iragacure819:4.10%
Hot stopper BHT:0.06%
Above compound is mixed in proportion in the single port flask, add after an amount of methylene dichloride mixes whole compound dissolutions (compound 1 can doublely be made linking agent), revolve part methylene chloride and get coating fluid (paste), be applied on the PET plastics base of processing through rubbing, coating thickness is approximately 1～10 μ m, then be heated to 120 ℃, UV light (intensity 80W mercury lamp) is according to forming red brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and is obtained printing-ink liquid crystal security pigment.
Shown in Fig. 1-2, the effect synoptic diagram of the film of liquid crystal compound behind photocuring on the PET film below polaroid that mixes for the ratio in present embodiment.Under polaroid, observe, adopt the dextrorotation sheet observation red color visible shown in Fig. 1-1 left side, adopt left-handed observation shown in Fig. 1-1 right side then to cannot see redness, and under natural light, observe red color visible.
Embodiment 2:
Prepare following liquid crystal compound:
Compound 1:29.72%
Compound 7:43.94%
Compound 8:12.18%
Compound 9:10.00%
Light trigger Iragacure819:4.10%
Hot stopper HQ:0.06%
Above compound is mixed in proportion in the single port flask, add an amount of methylene dichloride, after mixing, revolve part methylene chloride and get paste, be applied on the plastics base (PET) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 100 ℃, UV light (intensity 80W mercury lamp) is according to forming yellow brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Under polaroid, observe at the film behind the photocuring on the PET film in the liquid crystal compound that the ratio of present embodiment mixes, dextrorotation sheet observation visible yellow color, yellow is cannot see in left-handed observation.
Embodiment 3:
Prepare following liquid crystal compound:
Compound 1:31.49%
Compound 7:43.94%
Compound 8:12.18%
Compound 9:8.23%
Light trigger Iragacure819:4.10%
Hot stopper BHT:0.06%
Above compound is mixed in proportion in the single port flask, add an amount of methylene dichloride, after mixing, revolve part methylene chloride and get paste, be applied on the plastics base (PET) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 120 ℃, UV light (intensity 80W mercury lamp) is according to forming green brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Under polaroid, observe at the film behind the photocuring on the PET film in the liquid crystal compound that the ratio of present embodiment mixes, dextrorotation sheet observation visible green, green is cannot see in left-handed observation.
Embodiment 4:
Prepare following liquid crystal compound:
Compound 1:32.49%
Compound 7:44.94%
Compound 8:12.18%
Compound 9:6.23%
Light trigger Iragacure819:4.10%
Hot stopper HQ:0.06%
Above compound is mixed in proportion in the single port flask, add an amount of methylene dichloride, after mixing, revolve part methylene chloride and get paste, be applied on the plastics base (PET) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 120 ℃, UV light (intensity 80W mercury lamp) is according to forming bluish voilet brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Observe under polaroid at the film behind the photocuring on the PET film in the liquid crystal compound that the ratio of present embodiment mixes, the dextrorotation sheet is observed visible bluish voilet, and bluish voilet is cannot see in left-handed observation.
Embodiment 5:
Prepare following liquid crystal compound:
Compound 3:31.49%
Compound 7:43.94%
Compound 8:12.18%
Compound 10:8.23%
Light trigger Darocur TPO:4.10%
Hot stopper HQMME:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of THF, after mixing, revolve part THF and get paste, be applied on the plastics base (PET) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 110 ℃, UV light (intensity 80W mercury lamp) is according to forming red brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Under polaroid, observe at the film behind the photocuring on the PET film in the liquid crystal compound that the ratio of present embodiment mixes, dextrorotation sheet observation red color visible, redness is cannot see in left-handed observation.
Embodiment 6:
Prepare following liquid crystal compound:
Compound 3:31.49%
Compound 7:44.94%
Compound 8:12.18%
Compound 10:7.23%
Light trigger Darocur TPO:4.10%
Hot stopper HQ:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of THF, after mixing, revolve part THF and get paste, be applied on the plastics base (PVC) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 110 ℃, UV light (intensity 80W mercury lamp) is according to forming orange-yellow brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Observe under polaroid at the film behind the photocuring on the PVC film in the liquid crystal compound that the ratio of present embodiment mixes, the observation of dextrorotation sheet is as seen orange-yellow, and left-handed observation be cannot see orange-yellow.
Embodiment 7:
Prepare following liquid crystal compound:
Compound 3:32.49%
Compound 7:44.94%
Compound 8:12.18%
Compound 10:6.23%
Light trigger Darocur TPO:4.10%
Hot stopper HQ:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of THF, after mixing, revolve part THF and get paste, be applied on the plastics base (PVC) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 110 ℃, UV light (intensity 80W mercury lamp) is according to forming green brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Under polaroid, observe at the film behind the photocuring on the PVC film in the liquid crystal compound that the ratio of present embodiment mixes, dextrorotation sheet observation visible green, green is cannot see in left-handed observation.
Embodiment 8:
Prepare following liquid crystal compound:
Compound 3:32.72%
Compound 7:45.94%
Compound 8:12.18%
Compound 10:5.00%
Light trigger Darocur TPO:4.10%
Hot stopper HQMME:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of THF, after mixing, revolve part THF and get paste, be applied on the plastics base (PVC) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 110 ℃, UV light (intensity 80W mercury lamp) is according to forming bluish voilet brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Observe under polaroid at the film behind the photocuring on the PET film in the liquid crystal compound that the ratio of present embodiment mixes, the dextrorotation sheet is observed visible bluish voilet, and bluish voilet is cannot see in left-handed observation.
Embodiment 9:
Prepare following liquid crystal compound:
Compound 1:31.49%
Compound 7:43.94%
Compound 8:12.18%
Compound 11:8.23%
Light trigger Iragacure907:4.10%
Hot stopper BHT:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of methylene dichloride, after mixing, revolve part methylene chloride and get paste, be applied on the plastics base (PET) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 100 ℃, UV light (intensity 80W mercury lamp) is according to forming red brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Under polaroid, observe at the film behind the photocuring on the PVC film in the liquid crystal compound that the ratio of present embodiment mixes, left-handed observation red color visible, redness is cannot see in the observation of dextrorotation sheet.
Embodiment 10:
Prepare following liquid crystal compound:
Compound 1:32.49%
Compound 7:44.94%
Compound 8:12.18%
Compound 11:6.23%
Light trigger Iragacure907:4.10%
Hot stopper BHT:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of methylene dichloride, after mixing, revolve part methylene chloride and get paste, be applied on the plastics base (PP) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 110 ℃, UV light (intensity 80W mercury lamp) is according to forming green brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
As shown in Figure 2, the effect synoptic diagram of the film of liquid crystal compound behind photocuring on the PET film below polaroid that mixes for the ratio in present embodiment.Observe under the polaroid, left-handed observation visible green, green is cannot see in the observation of dextrorotation sheet, and observes visible green under natural light.
Embodiment 11:
Prepare following liquid crystal compound:
Compound 1:34.49%
Compound 7:44.94%
Compound 8:12.18%
Compound 11:4.23%
Light trigger Iragacure907:4.10%
Hot stopper HQ:0.06%
Above compound is mixed in proportion in the single port flask, add a certain amount of methylene dichloride, after mixing, revolve part methylene chloride and get paste, be applied on the plastics base (PP) of processing through rubbing, coating thickness is approximately 1～10 mu m range, then be heated to 120 ℃, UV light (intensity 80W mercury lamp) is according to forming bluish voilet brittle plastic film behind 0.5mins～3mins, stripping film is pulverized and obtained printing-ink liquid crystal security pigment.
Under polaroid, observe at the film behind the photocuring on the PVC film in the liquid crystal compound that the ratio of present embodiment mixes, the left-handed visible bluish voilet of observation, bluish voilet is cannot see in the observation of dextrorotation sheet.
Can see by above embodiment, by adopting different liquid crystal compounds, adjust proportioning and the temperature range of various compounds in the liquid crystal compound, can obtain having the liquid crystal security pigment of different main (facing) reflection wavelengths; Can obtain the liquid crystal security pigment of left-handed characteristic or dextrorotation characteristic by the type of adjusting chiral molecules in the liquid crystal compound.Present method is not only easy to operate, and is simple, and uses the anti-counterfeiting label decorations of present method processing that prepared pigment is printed to have macroscopic obvious different observation angle optic metachromatic effects.
In the above embodiment of the present invention, the plastics base also can adopt other plastics film of processing through rubbing, such as PVC (polyethylene), and PP (polypropylene), PI (polyimide) etc.Light trigger, hot stopper, solvent also can adopt other conventional light trigger, hot stopper and solvent, can select Iragacure819, Iragacure184, Iragacure2959, Iragacure651, Iragacure369, Iragacure907, Darocur TPO, Iragacure784 such as light trigger; Hot stopper can be selected the TBHQ(2-Tert. Butyl Hydroquinone), BHT(2,6-di-tert-butyl-4-methy phenol), the HQ(Resorcinol) and, HQMME (p methoxy phenol), 2,5-DTBHQ(2,5-ditert-butylhydro quinone); Solvent can be from methylene dichloride, trichloromethane, and tetrahydrofuran (THF), acetone, Virahol is selected in the butanone.In the polymerizable liquid-crvstalline mixture, also can add other linking agent, such as PETA (pentaerythritol triacrylate), TMPTA (propyl group three methyl alcohol triacrylates), HDDA (hexanediyl ester).
Claims (10)
1. the preparation method of a liquid crystal security pigment comprises the steps:
(1) adopt the polymerizable liquid-crvstalline mixture, this liquid crystal compound demonstrates specific solid color in certain temperature range;
(2) in the polymerizable liquid-crvstalline mixture, add light trigger, hot stopper and solvent obtain the coating fluid of paste after mixing, then be applied on the plastics base through orientation process, insulation prepares the Object LC dye film by the radiation UV-light in the said temperature interval;
(3) the above-mentioned film for preparing obtains the printing-ink granules of pigments through peeling off, pulverizing.
2. the preparation method of liquid crystal security pigment according to claim 1, it is characterized in that: described polymerizable liquid-crvstalline mixture is mixed to get by nematic liquid crystal molecule, chiral liquid crystal and/or non-liquid crystal molecule.
3. the preparation method of liquid crystal security pigment according to claim 2 is characterized in that: described polymerizable liquid-crvstalline mixture contains a kind of in following three compounds at least:
A) with the nematic liquid crystal monomer of one or more polymerizable reactive groups;
B) with one or without the liquid crystal monomer of polymerizable reaction group;
C) with one or more or without the photolytic activity chiral molecules that has liquid crystal liquid crystal property or do not have liquid crystal liquid crystal property of polymerizable reactive group.
4. the preparation method of liquid crystal security pigment according to claim 3, it is characterized in that: described polymerizable liquid-crvstalline mixture contains one or more in the following compound:
Compound 1:
Compound 2:
Compound 3:
Compound 4:
Compound 5:
Compound 6:
Compound 7:
Compound 8:
Compound 9:
Compound 10:
Compound 11:
5. the preparation method of liquid crystal security pigment according to claim 1 is characterized in that: described temperature range is room temperature～120 ℃.
6. the preparation method of liquid crystal security pigment according to claim 1 is characterized in that: the plastics film of described base for processing through rubbing.
7. the preparation method of liquid crystal security pigment according to claim 6, it is characterized in that: described plastics film is polyethylene terephthalate, polyethylene, polypropylene or polyimide.
8. the preparation method of liquid crystal security pigment according to claim 1, it is characterized in that: described light trigger is acyl group phosphorous oxides, bitter almond oil camphor and derivative, benzil class and cationic, and the add-on of light trigger is 0～5wt.%.
9. the preparation method of liquid crystal security pigment according to claim 1, it is characterized in that: described hot stopper is 2-Tert. Butyl Hydroquinone, 2,6-di-tert-butyl-4-methy phenol, Resorcinol, p methoxy phenol or 2,5-ditert-butylhydro quinone, add-on are 0～1wt.%.
10. the preparation method of liquid crystal security pigment according to claim 1, it is characterized in that: described solvent is methylene dichloride, trichloromethane, tetrahydrofuran (THF), acetone, Virahol and/or butanone.
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| CN116535569A (en) * | 2023-05-29 | 2023-08-04 | 苏州科技大学 | Pendant-free acrylic ester liquid crystal compound and preparation method thereof |
| CN116813960A (en) * | 2023-05-29 | 2023-09-29 | 苏州科技大学 | High-reflection adjustable liquid crystal film and preparation method thereof |
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| CN112895756A (en) * | 2021-02-05 | 2021-06-04 | 互联智慧信息科技(北京)有限公司 | Paper containing addable elements and preparation method thereof |
| CN116535569A (en) * | 2023-05-29 | 2023-08-04 | 苏州科技大学 | Pendant-free acrylic ester liquid crystal compound and preparation method thereof |
| CN116813960A (en) * | 2023-05-29 | 2023-09-29 | 苏州科技大学 | High-reflection adjustable liquid crystal film and preparation method thereof |
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