CN110501830B - Preparation method of bistable dye-doped liquid crystal film - Google Patents
Preparation method of bistable dye-doped liquid crystal film Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1391—Bistable or multi-stable liquid crystal cells
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Abstract
The invention discloses a preparation method of a bistable dye-doped liquid crystal film, belonging to the technical field of fine chemical engineering and material science. The method comprises the following steps: (1) mixing resin, a photoinitiator, a monomer and a phase-change material in proportion, and stirring to obtain a mixture A; (2) mixing 30-40% of the mixture A with 60-70% of dye-doped liquid crystal, and stirring to obtain a mixture B; (3) adding a spacer to mix with the mixture B, and stirring to obtain a bistable dye-doped liquid crystal film raw material; (4) coating, pressing and curing. The bistable dye-doped liquid crystal film prepared by the method changes color under the synergistic control action of electricity and temperature, can realize a continuous stable state of a certain color change state under the conditions of low temperature and power failure, has gorgeous and variable color, low driving voltage, good solvent resistance and water resistance, and can meet the requirements of people on individuation and diversity of liquid crystal color development in flexible display and intelligent textiles.
Description
Technical Field
The invention relates to a preparation method of a bistable dye-doped liquid crystal film, belonging to the technical field of fine chemical engineering and material science.
Background
Liquid crystal displays have been widely used in practice for a long time because of their excellent optical properties and electro-optical effects. Dye-doped liquid crystals are gradually becoming a research hotspot due to the advantages of low driving voltage, full-spectrum colorful display and the like. For example, the issue group of Taiwan K.L. Cheng adds dichroic dye into liquid crystal microcapsule to obtain a liquid crystal microcapsule with multiple color effect, the particle size of the product is 4-10 μm, and the product shows bright "cross pattern" under a polarizing microscope. The dye-doped liquid crystal microcapsule is prepared by a Miao project group of Jiangnan university by adopting an emulsion polymerization method, and the electrochromic textile with the driving voltage of 3-6V is prepared by a textile coating technology. However, reports on dye-doped liquid crystals so far mainly focus on a few areas and companies, and only monostable display effects can be achieved, which greatly restricts the application and development of dye-doped liquid crystals in the field of color change devices.
The bistable liquid crystal display has the same display characteristics as paper, can continuously display under the condition of power failure, can change display contents by applying voltage, has the characteristics of high contrast, wide viewing angle, ultralow power consumption, easiness in reading and writing and the like, can meet the requirements of large information amount, energy conservation and environmental protection in modern society compared with the traditional monostable liquid crystal display, and has wide application prospect. Such as: the intelligent color-changing glass is applied to intelligent color-changing glass, can play a role in color-changing and dimming under the power-on effect in daily use, can still keep specific color when the power is off, and greatly reduces the use energy consumption.
However, due to the unique physical and chemical properties of dye-doped liquid crystals, it is difficult to achieve bistable state. Currently, bistable liquid crystal technology mainly includes zenithal bistable liquid crystal display technology (ZBD) of nematic liquid crystal, which mainly uses specially designed grooves to achieve two bistability of nematic liquid crystal. Under the influence of surface anchoring effect, the orientation of liquid crystal molecules on the cross section of the groove grid has two stable states of high and low inclination angles, the stable effect is a function of the depth and the distance ratio of the groove grid, and the transition between the two stable effects can be realized through the adjustment of an external electric field. Based on the ZBD display principle, g.p. Brvan-Brown developed a high contrast, reflective zenithal bistable flexible display in combination with PEDOT-PET flexible electrodes/substrates. Flexible ZBD liquid crystal display devices developed by ZBD Displays, inc. However, the ZBD display has problems of narrow viewing angle, difficulty in realizing color display, and the like, and thus, application thereof to real life and work is still under further study. How to prepare a bistable dye-doped liquid crystal product which has excellent physical, chemical and optical properties and meets the requirements of low driving voltage and multicolor color change performance is a problem which needs to be solved urgently in the industry.
Disclosure of Invention
In order to solve the bistable problem of the dye-doped liquid crystal, the invention designs a bistable dye-doped liquid crystal film. The invention establishes a temperature and electric double control stable state system by introducing the phase-change material into the dye-doped liquid crystal system, and based on the stabilizing effect of the phase-change material, the device can present two stable states under the action of a zero electric field, wherein the former presents color, and the latter presents transparent incident light and displays the color of the substrate, and the conversion between the two states can be realized through electric field regulation.
The first purpose of the invention is to provide a preparation method of a bistable dye-doped liquid crystal film, which comprises the following steps:
(1) mixing resin, photoinitiator, monomer and phase-change material in proportion in a shading environment; uniformly stirring the mixture for 30 to 60 minutes at a temperature of between 30 and 60 ℃; obtaining a mixture A;
(2) mixing 30-40% of the mixture A with 60-70% of dye-doped liquid crystal, and uniformly stirring for 30-60 minutes at 30-60 ℃; the resulting blend B;
(3) adding 5 per mill of spacer with the diameter of 20 microns to mix with B, and uniformly stirring for 30-60 minutes at 30-60 ℃; obtaining a final bistable dye-doped liquid crystal film raw material;
(4) coating and pressing;
(5) and in the curing process, the residual air bubbles remained in the film are completely extracted.
In one embodiment of the present invention, the phase change material selected in step (1) includes, but is not limited to, the following materials: paraffin, n-tetradecane, n-hexacosane, n-octacosane, n-triacontane, octadecanol, hexadecanol, tetradecanol, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, glyceryl monostearate, phenyl salicylate, glyceryl laurate, p-azoxyanisole, diphenyl carbonate, phenyl salicylate, phenyl stearate and benzyl benzoate.
In one embodiment of the present invention, preferably, the phase change material is paraffin, n-tetracosane, n-hexacosane, n-octacosane, n-triacontane.
In one embodiment of the present invention, the resin in the step (1) accounts for 30 to 50% of the total mass fraction of the mixture A.
In one embodiment of the present invention, the monomer in the step (1) accounts for 30 to 60% of the total mass fraction of the mixture A.
In one embodiment of the present invention, the photoinitiator in the step (1) accounts for 3 to 7% of the total mass of the mixture a.
In one embodiment of the present invention, the phase-change material in the step (1) accounts for 30 to 50% of the total mass fraction of the mixture a.
In one embodiment of the present invention, the resin in step (1) is an adhesive, and the resin used in the present invention includes, but is not limited to, epoxy resin, 3010Z produced in taiwan, and the like.
In one embodiment of the present invention, the photoinitiator used in step (1) comprises one or more of I-hydroxycyclohexyl phenyl ketone (IRG 184), benzoin dimethyl ether (IRG 651), 2-hydroxy-2-methyl-I-phenyl-I-propanone (D1173), phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide (IRG 819).
In one embodiment of the present invention, the monomer of step (1) is added to reduce the driving voltage of the film and also serves as a diluent of the resin. The monomer comprises a hard monomer and a soft monomer, wherein the hard monomer is one or two of styrene, methyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, vinyl acetate, methyl vinyl ether, acrylonitrile, acrylamide, isoprene and dicyclopentadiene. The soft monomer comprises one or two of ethyl acrylate, butyl acrylate, isooctyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, lauryl methacrylate and n-octyl methacrylate.
In one embodiment of the present invention, all the liquid crystals of the dye-doped liquid crystal in the step (2) are nematic liquid crystal materials, preferably nematic biphenol-based liquid crystal materials. The liquid crystal material can be single crystal or mixed liquid crystal which is common in the existing liquid crystal display field. Generally, the liquid crystal material needs to have a large refractive index, which is greater than 0.2, and the ordinary refractive index of the liquid crystal material is close to that of the polymer after the prepolymer is cured. Including but not limited to one or more of trans-butylcyclohexanecarboxylic acid, hydroxydiphenylcyanide, 4-butylcyclohexanecarboxylic acid-4' -cyanobiphenol ester, N-4-methoxybenzylidene-N-butylaniline, beta-hydroxyethyl methacrylate, benzyl methacrylate.
In one embodiment of the present invention, the dichroic dye used for the dye-doped liquid crystal in the step (2) is an anthraquinone dye, an azo dye, or a leek dye. It includes, but is not limited to, c.i. disperse yellow 119, c.i. disperse red 135, c.i. disperse red 343, c.i. disperse blue 79, c.i. disperse blue 165, c.i. disperse blue 257, c.i. disperse blue 148, c.i. disperse red 167, or c.i. disperse brown 1.
In one embodiment of the invention, the curing in the step (4) is ultraviolet curing, wherein the wavelength of the ultraviolet light is 250-380 nm, and the intensity is 0.5-30 mW/cm2The curing time is 5-30 minutes, and the temperature is 20-40 ℃.
The second purpose of the invention is to provide a bistable dye-doped liquid crystal film by using the method.
The third purpose of the invention is to provide the application of the bistable dye-doped liquid crystal film in a liquid crystal display device.
In one embodiment of the present invention, the liquid crystal display (PDLC) device comprises an upper substrate and a lower substrate plated with a conductive layer, respectively, and a polymer dispersed liquid crystal film disposed between the two substrates, wherein the polymer dispersed liquid crystal film is formed by curing the bistable dye-doped liquid crystal film.
The invention has the beneficial effects that:
the bistable dye-doped liquid crystal film prepared by the method has the advantages that the phase-change material is used as a temperature switch to control the orientation arrangement characteristic of the dye-doped liquid crystal, and is also used as a protective layer to protect the dye-doped liquid crystal at the inner layer from being polluted by the external environment. The dyes employed in this process exhibit high order parameters, high dichroism and good solubility in the host nematic liquid crystal matrix. The obtained film has bright and variable color and bright color development, can meet the requirements of people on clothing individuation and diversity, can achieve bistable display performance, has good solvent resistance and water resistance, can achieve 5 levels of highest solvent resistance and water washing resistance, has a driving voltage as low as 3.2V (which is far lower than the human body safe voltage of 36V), and can still maintain the original color performance after processing. The bistable dye-doped liquid crystal film prepared by the method has good physical, chemical and optical properties and wide application prospect.
Drawings
FIG. 1 is a schematic diagram of an electrochromic mechanism of a bistable dye-doped liquid crystal film; the electrochromic mechanism of the bistable dye-doped liquid crystal film is as follows: the initial state of the bistable dye-doped liquid crystal film is a colored state; heating the film to a temperature above the phase transition point, and applying an electric field above the driving voltage, wherein the film is converted from a colored state to a colorless state; under the condition of removing the electric field, the temperature of the film is reduced from the temperature above the phase transition point to the temperature below the phase transition point, the film keeps a colored state, and the film keeps the colored state no matter whether the electric field is applied or not, namely the stable state 1 of the bistable dye-doped liquid crystal film; and under the condition of keeping the electric field, cooling the film from the temperature above the phase transition point to the temperature below the phase transition point, keeping the film in a colorless state, and keeping the film in a colorless state no matter whether the electric field is applied or not, namely, the film is in a stable state 2 of the bistable dye-doped liquid crystal film.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of better illustrating the invention and is not intended to limit the invention thereto.
And (3) testing the photoelectric performance:
coating the prepared bistable dye-doped liquid crystal film raw material on a rigid substrate with electrodes, covering another rigid electrode on the film after the coating is completely dried, bonding the upper and lower electrodes by using a colloid, carrying out packaging treatment, and carrying out photocuring to obtain the rigid bistable dye-doped liquid crystal film display device. And respectively adopting a direct current steady-state power supply to drive the device, and verifying the electrochromic phenomenon of the display device. The display effect and the electro-optic performance of the liquid crystal thin film device are respectively characterized: the display effect of the device under voltage driving is recorded by real-time photography; and (3) testing an incident light transmittance curve of the device under different external voltages by using the central reflection wavelength of the device in a color development state as a fixed detection wavelength by using a fiber optic spectrometer. In the test process, a double-layer electrode is used as a blank reference.
Water/solvent resistance test:
the water resistance test method and the solvent resistance test method refer to GB/T5211.5-2008, and the selected solvents are ethanol, ethylene glycol and acetone respectively.
Prepared in the following dye-doped liquid crystal reference patent CN201711404913. X.
Example 1
Under the environment of shading, 4.0 g of epoxy resin, 0.5 g of photoinitiator IRG184, 1.5 g of hydroxypropyl methacrylate, 1.5 g of lauryl methacrylate and 3.0 g of paraffin phase-change material are mixed in proportion; uniformly stirring the mixture for about 30 minutes at about 40 ℃ after mixing; obtaining a mixture A; mixing the mixture A with dye-doped liquid crystal (0.20 g of C.I. disperse red 135; 20.0g of liquid crystal E7), and stirring at about 40 deg.C for about 30 min; the resulting blend B; adding 5 per mill of spacer with the diameter of 20 microns to mix with B, and uniformly stirring for about 30 minutes at about 40 ℃; obtaining a final bistable dye-doped liquid crystal film raw material; coating and pressing; and (3) curing under ultraviolet light, and completely extracting residual bubbles remained in the film. The bistable dye-doped liquid crystal film prepared above was subjected to a photoelectric property test (see table 1) and a water resistance and solvent resistance test (see table 2).
Example 2
Under a shading environment, 3.0 g of epoxy resin, 0.3 g of photoinitiator IRG651, 2.0 g of styrene, 2.0 g of lauryl methacrylate and 3.0 g of paraffin phase change material are mixed in proportion; uniformly stirring the mixture for about 30 minutes at about 40 ℃ after mixing; obtaining a mixture A; mixing the mixture A with dye-doped liquid crystal (0.23 g of C.I. disperse blue 359; 23.0 g of liquid crystal E7), and stirring uniformly at about 40 deg.C for about 30 min; the resulting blend B; adding 5 per mill of spacer with the diameter of 20 microns to mix with B, and uniformly stirring for about 30 minutes at about 40 ℃; obtaining a final bistable dye-doped liquid crystal film raw material; coating and pressing; and (3) curing under ultraviolet light, and completely extracting residual bubbles remained in the film. The bistable dye-doped liquid crystal film prepared above was subjected to a photoelectric property test (see table 1) and a water resistance and solvent resistance test (see table 2).
Example 3
Under a shading environment, 5.0 g of epoxy resin, 0.7 g of photoinitiator IRG184, 3.0 g of ethyl methacrylate, 3.0 g of lauryl methacrylate and 5.0 g of paraffin phase-change material are mixed in proportion; uniformly stirring the mixture for about 30 minutes at about 40 ℃ after mixing; obtaining a mixture A; mixing the mixture A with dye-doped liquid crystal (1.15 g of C.I. disperse yellow 90; 15.0 g of liquid crystal 5 CB), and uniformly stirring at about 40 ℃ for about 30 minutes; the resulting blend B; adding 5 per mill of spacer with the diameter of 20 microns to mix with B, and uniformly stirring for about 30 minutes at about 40 ℃; obtaining a final bistable dye-doped liquid crystal film raw material; coating and pressing; and (3) curing under ultraviolet light, and completely extracting residual bubbles remained in the film. The bistable dye-doped liquid crystal film prepared above was subjected to a photoelectric property test (see table 1) and a water resistance and solvent resistance test (see table 2).
Example 4
Under a shading environment, 4.0 g of 3010Z, 0.5 g of photoinitiator D1173, 1.5 g of methyl methacrylate, 1.5 g of lauryl methacrylate and 3.0 g of n-octacosane phase change material are mixed in proportion; after mixing, evenly stirring the mixture for about 30 minutes at the room temperature of about 25 ℃; obtaining a mixture A; mixing the mixture A with dye-doped liquid crystal (0.20 g of C.I. disperse blue 60; 20.0g of liquid crystal E7), and stirring at about 40 deg.C for about 30 min; the resulting blend B; adding 5 per mill of spacer with the diameter of 20 microns to mix with B, and uniformly stirring for about 30 minutes at about 40 ℃; obtaining a final bistable dye-doped liquid crystal film raw material; coating and pressing; and (3) curing under ultraviolet light, and completely extracting residual bubbles remained in the film. The bistable dye-doped liquid crystal film prepared above was subjected to a photoelectric property test (see table 1) and a water resistance and solvent resistance test (see table 2).
Comparative example 1
The phase change material of 3.0 g of paraffin wax in example 1 was replaced with 3.0 g of cetyl alcohol, and the other conditions or parameters were in accordance with example 1. The bistable dye-doped liquid crystal film prepared above was subjected to a photoelectric property test (see table 1). The film loses the color change ability under the electric field.
Comparative example 2
The organic monomer 1.5 g of hydroxypropyl methacrylate and 1.5 g of lauryl methacrylate in example 1 were replaced with 3.0 g of oleic acid monomer, and the prepared bistable dye-doped liquid crystal film was subjected to the photoelectric property test under the same conditions or parameters as in example 1 (see Table 1). Experiments show that the driving voltage of the film is improved under the electric field, and the color change is not obvious.
Comparative example 3
The photoinitiator IRG651 in example 1 was omitted and the other conditions or parameters were in accordance with example 1. Experiments show that due to the absence of the photoinitiator, organic monomers cannot react to form polymers, so that the formed bistable dye-doped liquid crystal film cannot be prepared under the conditions. The bistable dye-doped liquid crystal film prepared above was subjected to a photoelectric property test (see table 1).
TABLE 1 Steady State Performance of Bistable dye doped liquid Crystal films
TABLE 2 Water and solvent resistance of Bistable dye doped liquid Crystal films
The dye-doped liquid crystal film with good light transmittance, high mechanical strength and chemical corrosion resistance is prepared by using the dye-doped liquid crystal, and meanwhile, the film needs to meet the requirements of lower driving voltage and multicolor electrochromic capacity and has the bistable characteristic of zero-electric-field color development. On the other hand, the invention researches a specific preparation method of the bistable dye-doped liquid crystal film, and the bistable dye-doped liquid crystal film is prepared by screening appropriate monomers, liquid crystal, dichroic dye and phase-change material and adopting a phase separation method. The phase-change material plays a crucial role in bistable display, and in the experimental process, not all the phase-change materials can realize dye-doped liquid crystal bistable color development. The bistable fixation material selection conditions mainly include two aspects: the phase-change material and the dye-doped liquid crystal have certain binding force, and the orientation distribution state of the dye-doped liquid crystal can be fixed (solid phase) or not fixed (liquid phase) in the phase-change process of the phase-change material, so that the bistable display effect is achieved; secondly, the interaction force between the phase-change material and the dye-doped liquid crystal is not too strong, otherwise the guest-host effect between the liquid crystal and the dye is affected, and thus the color-changing effect of the dye-doped liquid crystal is lost. Through multiple experiments of the inventor, the paraffin, the n-tetracosane, the n-hexacosane, the n-octacosane and the n-triacontane phase change materials can realize the bistable color development of the dye-doped liquid crystal.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A preparation method of an electric and temperature double-control bistable dye-doped liquid crystal film is characterized by comprising the following steps:
(1) in a shading environment, mixing resin, a photoinitiator, a monomer and a phase-change material in proportion, and stirring to obtain a mixture A;
(2) mixing 30-40% of the mixture A with 60-70% of dye-doped liquid crystal, and stirring to obtain a mixture B;
(3) adding a spacer to mix with the mixture B, and stirring to obtain a bistable dye-doped liquid crystal film raw material;
(4) coating, pressing and curing;
the phase change material is paraffin, n-tetracosane, n-hexacosane, n-octacosane or n-triacontane; the resin in the step (1) is a binder;
the monomer in the step (1) comprises a hard monomer and a soft monomer, wherein the hard monomer is one or two of styrene, methyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, vinyl acetate, methyl vinyl ether, acrylonitrile, acrylamide, isoprene and dicyclopentadiene; the soft monomer comprises one or two of ethyl acrylate, butyl acrylate, isooctyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, lauryl methacrylate and n-octyl methacrylate.
2. The method according to claim 1, wherein the mass ratio of the resin, the monomer, the photoinitiator and the phase-change material in the step (1) is (30-50): (30-60): (3-7): (30-50).
3. The process of claim 1, wherein the photoinitiator in step (1) comprises one or more of I-hydroxycyclohexyl phenyl ketone, benzoin bis methyl ether, 2-hydroxy-2-methyl-I-phenyl-I-propanone, phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide.
4. The method according to claim 1, wherein the curing in step (4) is performed by ultraviolet light, wherein the ultraviolet light has a wavelength of 250-380 nm and an intensity of 0.5-30 mW/cm2The curing time is 5-30 minutes, and the temperature is 20-40 ℃.
5. The method according to claim 1, wherein the stirring conditions in steps (1) - (3) are as follows: uniformly stirring the mixture for 30 to 60 minutes at a temperature of between 30 and 60 ℃.
6. The electric and temperature double-control bistable dye-doped liquid crystal film prepared by the method of any one of claims 1 to 5.
7. The use of the electric/thermal double-control bistable dye-doped liquid crystal film according to claim 6 in a liquid crystal display device.
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| CN104267523B (en) * | 2014-09-30 | 2017-09-12 | 江苏和成显示科技股份有限公司 | Microcapsules liquid crystal and its microcapsules liquid crystal display device |
| CN107429164A (en) * | 2014-11-06 | 2017-12-01 | 哥兹有限公司 | Bistable liquid crystal comprising metallomesogen primitive disperses body device and its application |
| CN104536188B (en) * | 2015-01-27 | 2018-06-26 | 京东方科技集团股份有限公司 | Transparent display and preparation method thereof |
| CN107015382A (en) * | 2017-03-24 | 2017-08-04 | 北京大学 | A kind of thin-film material for having electroluminescent and thermochromic function concurrently and preparation method thereof |
| CN108004789B (en) * | 2017-12-22 | 2019-06-07 | 江南大学 | A kind of preparation method of electrochromism liquid crystal microcapsule used for textiles |
| CN109293821B (en) * | 2018-09-30 | 2020-06-09 | 江南大学 | Dye-doped liquid crystal microcapsule material and preparation method thereof |
| CN109343261A (en) * | 2018-11-07 | 2019-02-15 | 南京工道光电技术有限公司 | A kind of automatically controlled polymer dispersed liquid-crystal film of variable color and preparation method |
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