CN116165819B - Wide-temperature-range electric control liquid crystal dimming film and preparation method thereof - Google Patents
Wide-temperature-range electric control liquid crystal dimming film and preparation method thereof Download PDFInfo
- Publication number
- CN116165819B CN116165819B CN202310451005.5A CN202310451005A CN116165819B CN 116165819 B CN116165819 B CN 116165819B CN 202310451005 A CN202310451005 A CN 202310451005A CN 116165819 B CN116165819 B CN 116165819B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- temperature
- wide
- dimming film
- electric control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1806—C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
- C09K2019/3016—Cy-Ph-Ph
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
- C09K2019/3019—Cy-Cy-Ph-Ph
Abstract
The wide-temperature-range electric control liquid crystal dimming film comprises an upper layer, a middle layer and a lower layer which are arranged in a laminated composite structure along the thickness direction, wherein the upper layer and the lower layer are conductive glass or conductive plastic films, the middle layer is a liquid crystal/polymer composite material, and the liquid crystal/polymer composite material comprises mixed liquid crystal, ultraviolet polymerizable monomers, a photoinitiator and glass microspheres; the mixed liquid crystal comprises a wide-temperature-range liquid crystal and a liquid crystal monomer with positive dielectric anisotropy and low melting point and high definition bright points; the wide temperature range liquid crystal is nematic liquid crystal, the birefringence is more than 0.18, the crystallization point is less than-40 ℃, the clearing point is more than 110 ℃, the viscosity is less than 180mPas, and the dielectric anisotropy is more than 5. According to the invention, the liquid crystal monomer with low crystallization point and high definition point is introduced into the liquid crystal system to obtain the wide-temperature-range electric control liquid crystal dimming film, and the film has the characteristics of higher contrast ratio at high temperature and higher response speed at low temperature, so that the practicability of the electric control dimming film outdoors is improved.
Description
Technical Field
The invention relates to the technical field of preparation and application of functional liquid crystal materials, in particular to a wide-temperature-range electric control liquid crystal dimming film and a preparation method thereof.
Background
As an electrically controlled liquid crystal dimming film, the Polymer Dispersed Liquid Crystal (PDLC) film has the advantages of high sensitivity, quick response time, simple and convenient preparation process and the like, can be prepared into large-area films with various shapes and thicknesses, and is favored by extensive researchers and manufacturers.
The PDLC film combines excellent mechanical and thermal properties of the polymer and the external field stimulus response characteristics of the liquid crystal, and can meet the intelligent, comfortable and energy-saving functions of automobiles and building windows. The sunlight transmittance of the window can be adjusted according to different weather and personal preference, and the dizziness problem caused by direct sunlight in summer can be solved. The film has the function of selectively shielding near infrared light or ultraviolet light by adding nano particles. Besides excellent electro-optical characteristics such as low driving voltage, low on-state haze and high contrast, the PDLC film should also have a wider working temperature in the intelligent window so as to adapt to the outdoor application environment.
In general, the operating temperature range of PDLC films is largely determined by the nature of the LC phase. The birefringence, dielectric anisotropy, viscosity and other physical properties of liquid crystals are extremely sensitive to temperature, which directly affects the electro-optical properties and applications of PDLC films.
At present, most commercial liquid crystals required for preparing a PDLC film with a wide temperature range have the phenomena of high clearing point and high viscosity, namely the problems that the PDLC film is difficult to drive at a low temperature and the response time is overlarge due to the fact that the high clearing point and the lower viscosity are difficult to keep simultaneously, and the higher industrialization requirement cannot be met, so that the application of the PDLC film is limited.
Disclosure of Invention
Based on the above, the invention provides a wide-temperature-range electric control liquid crystal dimming film and a preparation method thereof, so that the working temperature range of the PDLC film is further widened on the basis of the PDLC film in the prior art, and the film can have good electro-optic performance at high temperature or low temperature.
In order to achieve the above purpose, the invention provides a wide temperature range electric control liquid crystal dimming film, which comprises an upper layer, a middle layer and a lower layer which are arranged in a laminated composite structure along the thickness direction, wherein the upper layer and the lower layer are conductive glass or conductive plastic films, and the middle layer is a film-shaped liquid crystal/polymer composite material, and the wide temperature range electric control liquid crystal dimming film is characterized in that the liquid crystal/polymer composite material comprises mixed liquid crystal, ultraviolet polymerizable monomers, a photoinitiator and glass microspheres;
the mixed liquid crystal comprises a wide-temperature-range liquid crystal and a liquid crystal monomer;
the wide-temperature-range liquid crystal is nematic liquid crystal, the double refractive index of the wide-temperature-range liquid crystal is larger than 0.18, the crystallization point is smaller than-40 ℃, the clear point is larger than 110 ℃, the viscosity is smaller than 180mPas, and the dielectric anisotropy is larger than 5;
the liquid crystal monomer has low melting point and high definition bright points, is a liquid crystal monomer with positive dielectric anisotropy, and is selected from one or more of the following compounds:
wherein R is selected from the group-C n H 2n+1 、-OC n H 2n+1 N is an integer of 1 to 4.
As a further preferable technical scheme of the invention, 50.0 to 80.0 parts of liquid crystal and 50.0 to 20.0 parts of ultraviolet polymerizable monomer are mixed in the liquid crystal/polymer composite material in parts by weight; the initiator and the glass beads respectively account for 2 to 0.5 weight percent and 0.2 to 1.0 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer; the liquid crystal with wide temperature range in the mixed liquid crystal accounts for 70.0-95.0 wt% and the liquid crystal monomer accounts for 5.0-30 wt%.
As a further preferable technical scheme of the invention, the ultraviolet light polymerizable monomer is at least one of epoxy acrylate, polyurethane acrylate, polyester acrylate, epoxy acrylate, polyene thiol system, polyether acrylate and vinyl ether.
As a further preferable technical scheme of the invention, the photoinitiator is at least one of benzoin diethyl ether, 2-hydroxy-2-methyl-1-phenylpropion, trimethylbenzoyl diphenyl phosphine oxide and benzoin diethyl ether.
As a further preferable technical scheme of the invention, the thickness of the liquid crystal/polymer composite material is 8-25 mu m, and the diameter of the glass beads is 8-25 mu m.
As a further preferable technical scheme of the invention, the birefringence of the wide temperature range liquid crystal is more than 0.18 and less than 1.9, the crystallization point is less than-40 ℃, the clearing point is more than 110 ℃ and less than 500 ℃, the viscosity is less than 180mPas, and the dielectric anisotropy is more than 5 and less than 50.
According to another aspect of the present invention, the present invention further provides a method for preparing a wide temperature range electrically controlled liquid crystal dimming film, including the steps of:
s1, mixing the mixed liquid crystal, the ultraviolet polymerizable monomer, the glass beads and the photoinitiator, and uniformly stirring to form a prepolymer.
S2, pouring the prepolymer into the middle of two layers of parallel conductive glass or conductive plastic films, and curing by ultraviolet irradiation to obtain the wide-temperature-range electric control liquid crystal dimming film.
As a further preferable technical scheme of the invention, in the step S2, the temperature of the pre-polymerization liquid when the pre-polymerization liquid is poured into the middle of two layers of parallel conductive glass or conductive plastic films is 5-20 ℃ higher than the clear point temperature of the pre-polymerization liquid; the curing temperature is 0-10 ℃ higher than the clearing point temperature of the prepolymer, the curing time is 60-800 s, and the ultraviolet light intensity is 5-20 mW/cm 2 。
By adopting the technical scheme, the wide-temperature-range electric control liquid crystal dimming film and the preparation method thereof can achieve the following beneficial effects:
1) According to the invention, the liquid crystal monomer with positive dielectric anisotropy with low melting point and high definition bright points is introduced into the wide temperature range liquid crystal with specific characteristics (for example, the wide temperature range liquid crystal is nematic liquid crystal, the double refractive index is larger than 0.18, the crystallization point is smaller than-40 ℃, the clearing point is larger than 110 ℃, the viscosity is smaller than 180mPas, and the dielectric anisotropy is larger than 5), so that the rotation viscosity and clearing point temperature of mixed liquid crystal are effectively improved, the obtained wide temperature range electric control liquid crystal dimming film has excellent electro-optic performance, the driving voltage at-40 ℃ is smaller than 75V, the response time of rising and falling is respectively lower than 3s and 20s, the contrast ratio at 110 ℃ is higher than 15, namely, the liquid crystal film has the characteristics of higher contrast ratio at high temperature, and higher response speed at low temperature, thereby effectively solving the problems of low contrast ratio, high driving voltage at low temperature and high response time of the PDLC dimming film in the prior art, further being applied to high temperature and low temperature environment, and improving the actual dimming value of the liquid crystal film in the outdoor application in the skylight and the field, especially in the sunroof and the like;
2) The preparation method disclosed by the invention has the advantages of simple and operable preparation process, mild and controllable reaction and short curing time, and is beneficial to large-scale industrial production.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a scanning electron microscope photograph of the polymer-based micro morphology of the electronically controlled dimming film material prepared in comparative example 1;
FIG. 2 is a graph showing voltage-transmittance curves of the electronically controlled dimming film material prepared in comparative example 1 at different temperatures;
FIG. 3 is a scanning electron microscope photograph of the polymer-based micro morphology of the electronically controlled dimming film material prepared in example 1;
FIG. 4 is a graph showing voltage-transmittance curves of the electronically controlled dimming film material prepared in example 1 at different temperatures;
FIG. 5 is a scanning electron microscope photograph of the polymer-based micro morphology of the electronically controlled dimming film material prepared in example 2;
FIG. 6 is a graph showing voltage-transmittance curves of the electronically controlled dimming film material prepared in example 2 at different temperatures;
FIG. 7 is a scanning electron micrograph of a polymer-based micro morphology of the electronically controlled privacy film material prepared in example 3;
FIG. 8 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 3 at different temperatures;
FIG. 9 is a scanning electron micrograph of a polymer-based micro morphology of the electronically controlled privacy film material prepared in example 4;
FIG. 10 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 4 at different temperatures;
FIG. 11 is a structural formula of the compound shown in Table 1.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Description of the embodiments
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Unless defined otherwise, technical terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concepts pertain. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The invention provides a wide-temperature-range electric control liquid crystal dimming film, which comprises an upper layer, a middle layer and a lower layer which are arranged in a laminated composite structure along the thickness direction, wherein the upper layer and the lower layer are conductive glass or conductive plastic films, the middle layer is a liquid crystal/polymer composite material, the liquid crystal/polymer composite material is obtained by mixing and curing mixed liquid crystal, an ultraviolet polymerizable monomer, a photoinitiator and glass beads, and the mixed liquid crystal comprises wide-temperature-range liquid crystal and a liquid crystal monomer with positive dielectric anisotropy and low melting point and high definition bright points;
the wide-temperature-range liquid crystal is nematic liquid crystal, the double refractive index of the wide-temperature-range liquid crystal is larger than 0.18, the crystallization point is smaller than-40 ℃, the clear point is larger than 110 ℃, the viscosity is smaller than 180mPas, and the dielectric anisotropy is larger than 5;
the liquid crystal monomer is selected from one or more of the following compounds:
wherein R is selected from the group-C n H 2n+1 、-OC n H 2n+1 N is an integer of 1 to 4.
50.0 to 80.0 parts of mixed liquid crystal and 50.0 to 20.0 parts of ultraviolet polymerizable monomer are mixed in the liquid crystal/polymer composite material in parts by weight; the initiator and the glass beads respectively account for 2 to 0.5 weight percent and 0.2 to 1.0 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer; the liquid crystal with wide temperature range in the mixed liquid crystal accounts for 70.0-95.0 wt% and the liquid crystal monomer accounts for 5.0-30 wt%.
In order to enable those skilled in the art to further understand the technical scheme of the present invention, the technical scheme of the present invention is described in further detail below by way of examples.
The following examples 1-4 and comparative example 1, ultraviolet light polymerizable monomers were used with the compounds shown in Table 1, each having the structural formula shown in FIG. 11:
TABLE 1 ultraviolet polymerizable monomer Compounds and formulation
| Name of the name | Proportion/% |
| HA (hexyl acrylate) | 3 |
| CHA (cyclohexyl acrylate) | 1 |
| DPGDA (dipropylene glycol diacrylate) | 1 |
In practical application, the ultraviolet polymerizable monomer can be selected from one or more of epoxy acrylate, polyurethane acrylate, polyester acrylate, epoxy acrylate, polyene thiol system, polyether acrylate and vinyl ether, and can meet the technical requirements of the application and be replaced by each other.
In examples 1-4 and comparative example 1 below, the photoinitiator used in the ultraviolet polymerization was Irg651, which had the structure:
In the following examples 1-4 and comparative example 1, a wide temperature range liquid crystal designated GXP-6011 was used, which was manufactured by the Nicotiana Chemicals group Co., ltd, and its technical index was:Δn = 0.208, Δε=12.2，TCr-N < -40℃, T I-N =119 ℃, viscity (100 kPa, 20 ℃) =72 mpa·s. Of course, this is merely an example, and in practice, the wide temperature range liquid crystal of the present application may be produced by other companies as long as it has the characteristics defined in claim 1 of the present application.
In examples 1 to 4 and comparative example 1 below, the glass bead particle size was 20.0. Mu.m. The glass beads are used for controlling the film thickness of the liquid crystal/polymer composite material to be 8-25 mu m, and can be specifically selected according to actual needs.
In examples 1 to 4 and comparative example 1 below, the chemical structural formulas of the liquid crystal monomers having the reference numerals a, b, c, d and the reference numerals a, b, c, d are shown below, respectively:
in examples 1 to 4 and comparative example 1 below, the compound shown in Table 1 was used as the mixed liquid crystal:
TABLE 2 physical Property parameters of Mixed liquid Crystal
| Reference numerals | Kinds of mixed liquid crystal | Δn（589.3nm，25℃） | Δε（25℃） | η（mPa·s,，20℃） | T I-N (℃) |
| Y1 | 100% GXP-6011 | 0.208 | 12.2 | 72 | 119.4 |
| Y2 | 90%GXP-6011+10% a | 0.192 | 13.9 | 81 | 131.1 |
| Y3 | 90%GXP-6011+10% b | 0.189 | 13.1 | 86 | 130.2 |
| Y4 | 90%GXP-6011+10% c | 0.214 | 13.5 | 78 | 133.6 |
| Y5 | 90%GXP-6011+10% d | 0.212 | 12.9 | 82 | 131.4 |
Wherein the proportion of the liquid crystal mixture is calculated by mass percent,Δn is the birefringence of the hybrid liquid crystal,Δepsilon is the dielectric anisotropy of the mixed liquid crystal,ηt for mixing the rotational viscosity of the liquid crystal I-N Is the clearing point temperature of the mixed liquid crystal. It can be seen that both the rotational viscosity and clearing point temperature of Y2-Y5 are significantly improved over Y1.
Comparative example 1
S1: GXP-6011, without other liquid crystal material added, was taken and marked as Y1.
S2: the ultraviolet polymerizable monomers CHA (cyclohexyl acrylate), HA (hexyl acrylate) and DPGDA (dipropylene glycol diacrylate) are mixed according to the mass fraction ratio of the table 1, and after being fully and uniformly stirred, colorless transparent liquid at room temperature is obtained, and the colorless transparent liquid is marked as polymerizable mixed liquid A. Y1 was mixed with the polymerizable liquid a formulated at 7:3, respectively adding the photoinitiator and the glass beads into the mixture according to the mass percentage of 2.0 weight percent and 0.3 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer, and stirring the mixture at room temperature to form uniform liquid for later use.
S3: pouring the liquid in the step S2 into the middle of the transparent conductive plastic film plated with indium tin oxide by using a roll-to-roll processing mode, and simultaneously curing in an ultraviolet curing box under the condition that ultraviolet light with the wavelength of 365nm is used for irradiation, wherein the intensity is 16mW/cm 2 The curing temperature is 30 ℃ and the curing time is200s, an electronically controlled liquid crystal dimming film X0 with a wide temperature range is prepared, and the middle of the electronically controlled liquid crystal dimming film X0 is marked as a film X0.
Comparative example 1 is a comparative experiment for comparing the micro network structure and the operating temperature performance of the prepared light modulation film X0 with those of the light modulation films prepared in examples 2, 3, 4 and 5 below.
Cutting the prepared dimming film into small pieces, soaking in a mixed solution of cyclohexane and acetone, standing for two weeks, and fully separating out liquid crystal phase from the film. The surface of the film X0 was observed by a scanning electron microscope, and as shown in FIG. 1, the mesh size was uniform, and the average mesh size was 1.7. Mu.m.
The electro-optical properties of the film X0 at-40℃and 110℃were tested by placing a temperature control system in a liquid crystal integrated parameter meter, the performance parameters of which are given in Table 3, as shown in the graph of FIG. 2, in which V sat Represents a saturation voltage, which refers to a voltage required when the PDLC light transmittance reaches 90% of its maximum transmittance;CRthe contrast is represented by the following calculation method:CR=maximum transmittance of film in on state/transmittance in off state;t R the on-state response time is represented as the time required for the light transmittance to reach 90% of the maximum transmittance when an electric field is applied;t D the off-state response time is expressed as the time for which the transmittance of the film decreases to 10% of its maximum transmittance after the electric field is removed. The incident laser is 632nm He-Ne laser, the maximum voltage is 100V, the frequency is 1000Hz, and the air transmittance is 100%, and the normalization treatment is carried out.
TABLE 3 electro-optical performance parameters of dimming film XO
| Testing temperature (. Degree. C.) | V sat （V） | CR | t R （ms） | t D （ms） |
| 110 | 9 | 13 | 0.32 | 9.6 |
| -40 | 75 | 175 | 2700 | 19100 |
Examples
11: adding 10% of liquid crystal monomer marked as a into liquid crystal GXP-6011, heating and stirring to transparent liquid, and naturally cooling to obtain mixed liquid crystal marked as Y2; the ultraviolet polymerizable monomers are mixed according to the mass fraction ratio of the table 1, and after being fully and uniformly stirred, colorless transparent liquid at room temperature is obtained, and the colorless transparent liquid is marked as polymerizable mixed liquid A.
12: liquid crystal Y2 was mixed with the prepared polymerizable mixed liquid a at 7:3, respectively adding the photoinitiator and the glass beads into the mixture according to the mass percentage of 2.0 weight percent and 0.3 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer, and stirring the mixture at room temperature to form uniform liquid for later use.
13: mixing the liquid in 12, adding by roller-to-rollerIn the working mode, the transparent conductive plastic film coated with indium tin oxide is poured in, and is cured in an ultraviolet curing box at the same time, wherein the curing condition is that ultraviolet light with the wavelength of 365nm is used for irradiation, and the intensity is 16mW/cm 2 The curing temperature is 33 ℃ and the time is 200s, and the electric control liquid crystal dimming film X1 with a wide temperature range is prepared, wherein the middle of the electric control liquid crystal dimming film X1 is marked as a film X1;
cutting the prepared dimming film into small pieces, soaking in a mixed solution of cyclohexane and acetone, standing for two weeks, and fully separating out liquid crystal phase from the film. As shown in FIG. 3, when the surface of the film X1 is observed by a scanning electron microscope, the mesh size of XI becomes larger than that of X0, the average mesh size is 2.3 μm, and the PDLC film driving voltage is reduced and the contrast is correspondingly reduced due to the increase of polymer meshes.
The electro-optical properties of film X1 at-40℃and 110℃were tested using a temperature control system installed in a liquid crystal integrated parameter meter, as shown in FIG. 4, the performance parameters of which are given in Table 4. Compared with X0, the dimming film X1 has lower saturation voltage and quicker response time at 40 ℃ below zero.
TABLE 4 electro-optical performance parameters of light modulating film X1
| Testing temperature (. Degree. C.) | V sat （V） | CR | t R （ms） | t D （ms） |
| 110 | 6.5 | 13 | 0.38 | 8.8 |
| -40 | 59 | 121 | 1900 | 16100 |
Examples
21: adding 10% of liquid crystal monomer marked as b into liquid crystal GXP-6011, heating and stirring to transparent liquid, and naturally cooling to obtain mixed liquid crystal marked as Y3; the ultraviolet polymerizable monomers are mixed according to the mass fraction ratio of the table 1, and after being fully and uniformly stirred, colorless transparent liquid at room temperature is obtained, and the colorless transparent liquid is marked as polymerizable mixed liquid A.
22: liquid crystal Y3 was mixed with the prepared polymerizable mixed liquid a at 7:3, respectively adding the photoinitiator and the glass beads into the mixed liquid at the mass percent of 2.0 weight percent and 0.3 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer, and stirring the mixed liquid at room temperature to form uniform mixed liquid for later use.
23: mixing the liquid in 22, pouring the transparent conductive plastic film coated with indium tin oxide into the middle by using a roll-to-roll processing mode, and simultaneously curing in an ultraviolet curing box under the curing condition that the ultraviolet light with the wavelength of 365nm is used for irradiation, wherein the intensity is 16mW/cm 2 The curing temperature is 35 ℃ and the time is 200s, and the electric control liquid crystal with wide temperature range is preparedA light adjusting film X2, the middle of which is denoted as a film X2;
cutting the prepared dimming film into small pieces, soaking in a mixed solution of cyclohexane and acetone, standing for two weeks, and fully separating out liquid crystal phase from the film. As shown in FIG. 5, the average mesh size of the film X2 was 2.5. Mu.m, and the film X2 was observed by a scanning electron microscope, and a liquid crystal monomer having a larger molecular chain was incorporated into the film X2 than X0, thereby increasing the mesh size.
The electro-optical properties of film X1 at-40℃and 110℃were tested using a temperature control system installed in a liquid crystal integrated parameter meter, as shown in FIG. 6, whose performance parameters are given in Table 5. Compared with X0, the saturated voltage of the dimming film X2 at minus 40 ℃ is slightly reduced, and the dimming film also shows faster recovery time.
TABLE 5 electro-optical performance parameters of light modulating film X2
| Testing temperature (. Degree. C.) | V sat （V） | CR | t R （ms） | t D （ms） |
| 110 | 5 | 9 | 0.35 | 9.5 |
| -40 | 63 | 110 | 2100 | 17200 |
Examples
31: adding 10% of liquid crystal monomer marked as c into liquid crystal GXP-6011, heating and stirring to transparent liquid, and naturally cooling to obtain mixed liquid crystal marked as Y4; the ultraviolet polymerizable monomers are mixed according to the mass fraction ratio of the table 1, and after being fully and uniformly stirred, colorless transparent liquid at room temperature is obtained, and the colorless transparent liquid is marked as polymerizable mixed liquid A.
32: liquid crystal Y4 was mixed with the prepared polymerizable mixed liquid a at 7:3, respectively adding the photoinitiator and the glass beads into the mixed liquid at the mass percent of 2.0 weight percent and 0.3 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer, and stirring the mixed liquid at room temperature to form uniform mixed liquid for later use. 33: mixing the liquid in 32, pouring the mixed liquid into the middle of the transparent conductive plastic film plated with indium tin oxide by using a roll-to-roll processing mode, and simultaneously curing in an ultraviolet curing box under the curing condition that the ultraviolet light with the wavelength of 365nm is used for irradiation, wherein the intensity is 16mW/cm 2 The curing temperature is 32 ℃ and the time is 200s, and the electric control liquid crystal dimming film X3 with a wide temperature range is prepared, and the middle of the electric control liquid crystal dimming film X3 is marked as a film X3;
cutting the prepared dimming film into small pieces, soaking in a mixed solution of cyclohexane and acetone, standing for two weeks, and fully separating out liquid crystal phase from the film. The surface of the film X3 was observed by a scanning electron microscope, which showed a smaller mesh size, as shown in FIG. 7, with an average mesh size of 1.5. Mu.m.
The electro-optical properties of film X3 at-40℃and 110℃were tested using a temperature control system installed in a liquid crystal integrated parameter meter, as shown in FIG. 8, whose performance parameters are given in Table 6. Compared with X0, the dimming film X3 has a higher contrast at a high temperature, and also exhibits a lower saturation voltage at-40 ℃.
TABLE 6 electro-optical performance parameters of light modulating film X3
| Testing temperature (. Degree. C.) | V sat （V） | CR | t R （ms） | t D （ms） |
| 110 | 8.5 | 22 | 0.48 | 5.6 |
| -40 | 70 | 145 | 2530 | 18500 |
Examples
41: adding 10% of liquid crystal monomer marked as d into liquid crystal GXP-6011, heating and stirring to transparent liquid, and naturally cooling to obtain mixed liquid crystal marked as Y5; the ultraviolet polymerizable monomers are mixed according to the mass fraction ratio of the table 1, and after being fully and uniformly stirred, colorless transparent liquid at room temperature is obtained, and the colorless transparent liquid is marked as polymerizable mixed liquid A.
42: liquid crystal Y5 was mixed with the prepared polymerizable mixed liquid a at 7:3, respectively adding the photoinitiator and the glass beads into the mixed liquid at the mass percent of 2.0 weight percent and 0.3 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer, and stirring the mixed liquid at room temperature to form uniform mixed liquid for later use.
43: mixing the liquid in the step S2, pouring the mixed liquid into the middle of the transparent conductive plastic film plated with indium tin oxide by using a roll-to-roll processing mode, and simultaneously curing in an ultraviolet curing box under the curing condition that the ultraviolet light with the wavelength of 365nm is used for irradiation, wherein the intensity is 16mW/cm 2 The curing temperature is 35 ℃ and the time is 200s, and the electric control liquid crystal dimming film X4 with a wide temperature range is prepared, and the middle of the electric control liquid crystal dimming film X4 is marked as a film X4;
cutting the prepared dimming film into small pieces, soaking in a mixed solution of cyclohexane and acetone, standing for two weeks, and fully separating out liquid crystal phase from the film. The surface of the film X4 was observed by a scanning electron microscope, and as shown in FIG. 9, the average mesh size was 2.0. Mu.m.
The electro-optical properties of film X4 were tested at-40℃and 110℃using a temperature control system installed in a liquid crystal integrated parameter meter, as shown in FIG. 10, the performance parameters of which are given in Table 7. The dimming film X4 has a higher contrast at a high temperature compared to X0.
TABLE 7 electro-optical performance parameters of light modulating film X4
| Testing temperature (. Degree. C.) | V sat （V） | CR | t R （ms） | t D （ms） |
| 110 | 10 | 19 | 0.42 | 6.8 |
| -40 | 72 | 135 | 2840 | 19200 |
Examples
This example uses the same preparation as in example 2, except that only the alkane of compound a was usedThe radical being replaced by alkoxy-OC 3 H 7 The rest technological parameters and materials are kept unchanged, the electro-optical properties of the obtained electric control dimming film and the electro-optical properties of the dimming film X2 are close, the saturation voltage of the electric control dimming film can be slightly reduced at 40 ℃ below zero, and the electric control dimming film also shows faster recovery time.
Examples
This example uses the same preparation as example 4, substituting only the alkyl group of compound d with an alkoxy-OC group 5 H 11 The rest technological parameters are kept unchanged, the electro-optical performance of the obtained electric control dimming film is close to that of the dimming film X4, and the electric control dimming film has higher contrast ratio at high temperature.
In summary, after the alkyl and the alkoxy in each liquid crystal monomer are replaced, the performance of the prepared dimming film is close, and the technical requirements of the invention can be met.
Examples
In the embodiment, the same preparation method as in the embodiment 3 is adopted, and only one of epoxy acrylate, polyurethane acrylate, polyester acrylate, epoxy acrylate, polyene thiol system, polyether acrylate and vinyl ether is selected by the ultraviolet polymerizable monomer, the other technological parameters are kept unchanged, the obtained electric control dimming film has high contrast ratio at high temperature and also has low saturation voltage at minus 40 ℃ and the electro-optical performance of the dimming film X3 is close.
Examples
In the embodiment, the same preparation method as in the embodiment 2 is adopted, only the wide-temperature-range liquid crystal is replaced by GXP-6015 produced by the tobacco stand bloom technology group Co., ltd, other technological parameters and materials are kept unchanged, and the obtained electric control dimming film has the electro-optical performance similar to that of the dimming film X2 and can have higher contrast at high temperature.
Examples
This example adopts the same preparation method as in example 3, and only the wide temperature range liquid crystal was replaced with GXP-6015 (its technical index:Δn = 0.250, TCr-N < -40℃, T I-N = 122℃, viscosity (100 kPa, 20℃) = 107 mPa∙s）the other technological parameters and materials are kept unchanged, the electro-optical properties of the obtained electric control dimming film and the electro-optical properties of the dimming film X3 are close, and the electric control dimming film and the electro-optical materials have higher contrast ratio at high temperature.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (7)
1. The wide-temperature-range electric control liquid crystal dimming film comprises an upper layer, a middle layer and a lower layer which are arranged in a laminated composite structure along the thickness direction, wherein the upper layer and the lower layer are conductive glass or conductive plastic films, and the middle layer is a liquid crystal/polymer composite material, and the wide-temperature-range electric control liquid crystal dimming film is characterized in that the liquid crystal/polymer composite material comprises mixed liquid crystal, an ultraviolet polymerizable monomer, a photoinitiator and glass microspheres;
the mixed liquid crystal comprises a wide-temperature-range liquid crystal and a liquid crystal monomer;
the wide-temperature-range liquid crystal is nematic liquid crystal, the double refractive index of the wide-temperature-range liquid crystal is larger than 0.18, the crystallization point is smaller than-40 ℃, the clear point is larger than 110 ℃, the viscosity is smaller than 180mPas, and the dielectric anisotropy is larger than 5;
the liquid crystal monomer is selected from one or more of the following compounds:
2. The wide temperature range electrically controlled liquid crystal dimming film according to claim 1, wherein 50.0-80.0 parts of liquid crystal and 50.0-20.0 parts of ultraviolet polymerizable monomer are mixed in the liquid crystal/polymer composite material in parts by weight;
the initiator and the glass beads respectively account for 2 to 0.5 weight percent and 0.2 to 1.0 weight percent of the total mass of the mixed liquid crystal and the ultraviolet polymerizable monomer;
the liquid crystal with wide temperature range in the mixed liquid crystal accounts for 70.0-95.0 wt% and the liquid crystal monomer accounts for 5.0-30 wt%.
3. The wide temperature range electronically controlled liquid crystal dimming film of claim 1, wherein the uv polymerizable monomer is at least one of epoxy acrylate, urethane acrylate, polyester acrylate, epoxy acrylate, polyenyl mercaptan system, polyether acrylate, vinyl ether.
4. The wide temperature range electronically controlled liquid crystal dimming film of claim 1, wherein the photoinitiator is at least one of benzoin diethyl ether, 2-hydroxy-2-methyl-1-phenylpropione, trimethylbenzoyl diphenyl phosphine oxide, benzoin diethyl ether.
5. The wide temperature range electrically controlled liquid crystal dimming film according to claim 1, wherein the thickness of the liquid crystal/polymer composite material is 8-25 μm, and the diameter of the glass beads is 8-25 μm.
6. A method for preparing the wide temperature range electric control liquid crystal dimming film according to any one of claims 1 to 5, which is characterized by comprising the following steps:
s1, mixing mixed liquid crystal, ultraviolet polymerizable monomers, glass beads and a photoinitiator, and uniformly stirring to form a prepolymer;
s2, pouring the prepolymer into the middle of two layers of parallel conductive glass or conductive plastic films, and curing by ultraviolet irradiation to obtain the wide-temperature-range electric control liquid crystal dimming film.
7. The method for preparing the wide-temperature-range electric control liquid crystal dimming film according to claim 6, wherein in the step S2, the temperature of the pre-polymerization liquid when the pre-polymerization liquid is poured into the middle of two layers of parallel conductive glass or conductive plastic films is 5-20 ℃ higher than the clear point temperature of the pre-polymerization liquid; the curing temperature is 0-10 ℃ higher than the clear point temperature of the prepolymer liquid, and the curing time is 60-to-60%800s, the ultraviolet light intensity is 5-20 mW/cm 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310451005.5A CN116165819B (en) | 2023-04-25 | 2023-04-25 | Wide-temperature-range electric control liquid crystal dimming film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310451005.5A CN116165819B (en) | 2023-04-25 | 2023-04-25 | Wide-temperature-range electric control liquid crystal dimming film and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116165819A CN116165819A (en) | 2023-05-26 |
| CN116165819B true CN116165819B (en) | 2023-06-27 |
Family
ID=86416695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310451005.5A Active CN116165819B (en) | 2023-04-25 | 2023-04-25 | Wide-temperature-range electric control liquid crystal dimming film and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116165819B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0313053A2 (en) * | 1987-10-20 | 1989-04-26 | Dainippon Ink And Chemicals, Inc. | Liquid crystal device |
| CN103614146A (en) * | 2013-11-28 | 2014-03-05 | 北京八亿时空液晶科技股份有限公司 | Polymer dispersed liquid crystal material, display apparatus containing same and preparation method thereof |
| CN104560059A (en) * | 2014-12-12 | 2015-04-29 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal material and application thereof |
| CN108594509A (en) * | 2018-06-07 | 2018-09-28 | 珠海兴业新材料科技有限公司 | A kind of wide warm light modulation film and preparation method thereof |
| CN109897644A (en) * | 2017-12-07 | 2019-06-18 | 北京大学 | A kind of high contrast, low voltage drive and quick response electrically-controlled liquid crystal light modulation film and preparation method thereof |
| CN110862829A (en) * | 2019-11-19 | 2020-03-06 | 北京大学 | Low-driving-voltage liquid crystal composition for PDLC (polymer dispersed liquid crystal) and preparation method thereof |
| CN114686242A (en) * | 2020-12-28 | 2022-07-01 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal compound and preparation method and application thereof |
| CN115216308A (en) * | 2021-04-15 | 2022-10-21 | 江苏和成显示科技有限公司 | Liquid crystal composition and liquid crystal display device thereof |
| TW202242073A (en) * | 2021-04-15 | 2022-11-01 | 大陸商江蘇和成顯示科技有限公司 | Liquid crystal composition and liquid crystal display device thereof featuring a larger absolute value of dielectric anisotropy, a larger K value, longer storage time at low temperature, less surface roughness of a polymer layer, a smaller pretilt angle, a faster angular velocity, less polymer residue, higher VHR and good pretilt angle stability |
-
2023
- 2023-04-25 CN CN202310451005.5A patent/CN116165819B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0313053A2 (en) * | 1987-10-20 | 1989-04-26 | Dainippon Ink And Chemicals, Inc. | Liquid crystal device |
| CN103614146A (en) * | 2013-11-28 | 2014-03-05 | 北京八亿时空液晶科技股份有限公司 | Polymer dispersed liquid crystal material, display apparatus containing same and preparation method thereof |
| CN104560059A (en) * | 2014-12-12 | 2015-04-29 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal material and application thereof |
| CN109897644A (en) * | 2017-12-07 | 2019-06-18 | 北京大学 | A kind of high contrast, low voltage drive and quick response electrically-controlled liquid crystal light modulation film and preparation method thereof |
| CN108594509A (en) * | 2018-06-07 | 2018-09-28 | 珠海兴业新材料科技有限公司 | A kind of wide warm light modulation film and preparation method thereof |
| CN110862829A (en) * | 2019-11-19 | 2020-03-06 | 北京大学 | Low-driving-voltage liquid crystal composition for PDLC (polymer dispersed liquid crystal) and preparation method thereof |
| CN114686242A (en) * | 2020-12-28 | 2022-07-01 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal compound and preparation method and application thereof |
| CN115216308A (en) * | 2021-04-15 | 2022-10-21 | 江苏和成显示科技有限公司 | Liquid crystal composition and liquid crystal display device thereof |
| TW202242073A (en) * | 2021-04-15 | 2022-11-01 | 大陸商江蘇和成顯示科技有限公司 | Liquid crystal composition and liquid crystal display device thereof featuring a larger absolute value of dielectric anisotropy, a larger K value, longer storage time at low temperature, less surface roughness of a polymer layer, a smaller pretilt angle, a faster angular velocity, less polymer residue, higher VHR and good pretilt angle stability |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116165819A (en) | 2023-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108594509B (en) | A kind of wide warm light modulation film and preparation method thereof | |
| CN100487076C (en) | Process for preparing high polymer dispersed liquid crystal film material | |
| CN109324433B (en) | Polymer dispersed liquid crystal film doped with nano particles and preparation method thereof | |
| CN106338854B (en) | The method that heating-ultraviolet light step-by-step polymerization prepares cholesteric liquid crystal function film | |
| CN1790118A (en) | Preparation method of polymer dispersed liquid crystal film | |
| KR101471551B1 (en) | Polymer dispersed liquid crystal light control bodies used nickel based electrodes and manufacturing method of the same | |
| CN106324883B (en) | The method that ultraviolet-heating step-by-step polymerization prepares cholesteric liquid crystal function film | |
| TWI579370B (en) | Switching element containing a liquid-crystalline medium | |
| JP2016534176A (en) | Liquid crystal polymer composition, method for producing the same and liquid crystal article comprising the same | |
| CN104560059A (en) | Liquid crystal material and application thereof | |
| US8187493B2 (en) | PDLC films | |
| CN106398715A (en) | High temperature liquid crystal composition, high temperature polymer dispersed liquid crystal composition and high temperature polymer dispersed liquid crystal membrane | |
| CN1803979A (en) | Method for preparing polymer dispersed liquid crystal film | |
| CA2096826A1 (en) | Polymer-dispersed liquid crystal device having an ultraviolet-polymerizable matrix and a variable optical transmission and a method for preparing the same | |
| CN109897644B (en) | High-contrast, low-voltage driving and quick-response electric control liquid crystal dimming film and preparation method thereof | |
| CN109752893B (en) | Temperature control light adjusting film for sectionally regulating and controlling visible light and near infrared light transmissivity and preparation method thereof | |
| JP5458014B2 (en) | Heat-sensitive light-modulating material, method for producing the same, and optical component including the same | |
| CN116165819B (en) | Wide-temperature-range electric control liquid crystal dimming film and preparation method thereof | |
| CN113980274A (en) | Preparation method of polymer dispersed liquid crystal film | |
| CN110007499A (en) | A kind of Multifunctional liquid crystal light modulation film with multiple response, transmission element and preparation method thereof | |
| CN113885245A (en) | Liquid crystal dimming film with high mechanical property, low driving voltage and high contrast and preparation method thereof | |
| TW202233811A (en) | Light control liquid crystal composition containing anthraquinone compound, its photo-cured product and light control element | |
| CN109581775B (en) | Electric control dimming film with low driving voltage and preparation method thereof | |
| CN117417559A (en) | Wide-temperature-range type electric control liquid crystal dimming film with improved electro-optic performance and preparation method thereof | |
| CN117434757A (en) | Wide-temperature-range dimming film with low off-axis haze and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |