CN111596482A - Liquid crystal light adjusting film and preparation method thereof - Google Patents
Liquid crystal light adjusting film and preparation method thereof Download PDFInfo
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- CN111596482A CN111596482A CN202010527690.1A CN202010527690A CN111596482A CN 111596482 A CN111596482 A CN 111596482A CN 202010527690 A CN202010527690 A CN 202010527690A CN 111596482 A CN111596482 A CN 111596482A
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
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Abstract
A liquid crystal light adjusting film and a preparation method thereof, the liquid crystal light adjusting film comprises a first conductive film, a second conductive film, a first silicon dioxide coating, a second silicon dioxide coating and a polymer dispersed liquid crystal material, wherein conductive substances are arranged on one side surfaces of the first conductive film and the second conductive film; the first silicon dioxide coating and the second silicon dioxide coating are respectively arranged on the surfaces of one sides of the first conductive film and the second conductive film, which are provided with the conductive substances; the polymer dispersed liquid crystal material is arranged between the first conductive film and the second conductive film and is respectively contacted with the conductive substance, the first silicon dioxide coating and the second silicon dioxide coating. The nano silicon dioxide coating is arranged, so that the transparency of the liquid crystal light adjusting film in a transparent state can be improved, and the polymer dispersed liquid crystal material is spread during processing, so that the processing efficiency is improved, and the product performance is improved. The invention has the characteristics of convenient processing and high processing efficiency, has strong practicability and is suitable for being widely popularized.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a light adjusting film, in particular to a liquid crystal light adjusting film and a preparation method thereof.
[ background of the invention ]
The light adjusting FILM is also called a polymer dispersed liquid crystal FILM, also called PDLC FILM, and is manufactured by dispersing liquid crystal in a polymer matrix between two transparent FILMs through a special process. Since the optical axes of the small droplets of liquid crystal molecules are in a free orientation, the liquid crystal material is in a disordered state, the refractive index of which does not match that of the matrix, and when light passes through the matrix, the droplets are strongly scattered to be in an opaque milky white state or a translucent state. The application of an electric field can adjust the optical axis orientation of the liquid crystal droplets to convert the disordered liquid crystal material into an ordered arrangement. When the two refractive indexes are matched, a transparent state is presented. The electric field is removed, and the liquid crystal droplets restore the original light scattering state, so that the polymer dispersed liquid crystal film has electrically controlled optical switching characteristics under the action of the electric field.
The prior light adjusting film has similar basic principle, but the processing technique and the performance of the finished product are different. When a polymer dispersed liquid crystal material is arranged between two transparent films (generally PET films) in a conventional light modulation film, the material is not easy to spread flatly, the material is inconvenient and uniform to distribute, and the material is inconvenient to process and can influence the performance of a finished product.
[ summary of the invention ]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal light-adjusting film which can be easily processed and can improve transparency, and a method for producing the same.
In order to solve the problems, the invention provides a liquid crystal light adjusting film which is characterized by comprising a first conductive film, a second conductive film, a first silicon dioxide coating, a second silicon dioxide coating and a polymer dispersed liquid crystal material, wherein a conductive substance is arranged on one side surface of the first conductive film; a conductive substance is arranged on one side surface of the second conductive film; the first silicon dioxide coating is arranged on the surface of one side of the first conductive film, which is provided with the conductive substance; the second silicon dioxide coating is arranged on the surface of one side of the second conductive film, which is provided with the conductive substance; the polymer dispersed liquid crystal material is arranged between the first conductive film and the second conductive film and is respectively contacted with the conductive substance, the first silicon dioxide coating and the second silicon dioxide coating.
Further, the first silicon oxide coating layer is formed by electroplating a nano silicon oxide material on the surface of the first conductive film on the side provided with the conductive substance; the second silicon oxide coating layer is formed by electroplating a nano-silicon oxide material on a surface of the second conductive film on the side provided with the conductive substance.
Further, the first silicon dioxide coating is filled in the surface of the first conductive film; the second silicon dioxide coating is filled in the surface of the second conductive film.
Further, the polymer dispersed liquid crystal material comprises the following components by the total weight of the polymer dispersed liquid crystal material of 100 percent:
nematic liquid crystal: 30 to 59.8 percent
A chiral agent: 0.05 to 5 percent
Photo-curing monomer: 28.2 to 59.8 percent
Photoinitiator (2): 0.05 to 1 percent
Spacer particles: 0.05 to 1 percent
Solvent: 0.05 to 5 percent.
Further, the light-curing monomer comprises one or more of acrylate monomers and vinyl ether monomers.
Further, the photoinitiator comprises one or more of ethyl 2, 4, 6-trimethylbenzoylphenylphosphonate, 4- (phenylthio) phenyldiphenylsulfonium hexafluorophosphate, 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-one, and 2-hydroxy-2-methyl-1-phenylpropanone.
Further, the spacing particles are particles with the particle size of 10-20 micrometers; the solvent is one or more of ethanol and isopropanol.
Further, a first ultraviolet-resistant coating is arranged on the surface of the first conductive film, which is opposite to the first silicon dioxide coating; and a second ultraviolet resistant coating is arranged on the surface of one side, opposite to the second silicon dioxide coating, of the second conductive film.
In addition, the invention also provides a preparation method of the liquid crystal light adjusting film, which is characterized by comprising the following steps:
s1: selecting a PET film, and attaching a conductive substance to the inner surface of the PET film to form a first conductive film and a second conductive film respectively;
s2: respectively attaching nano-silica materials to the surfaces of the first conductive film and the second conductive film, which are provided with conductive substances, so as to form a first silica coating and a second silica coating;
s3: uniformly coating a polymer dispersed liquid crystal material between a first conductive film and a second conductive film, and then curing by ultraviolet irradiation; the illumination intensity is 0.1-10mW/m2, and the curing time is 3-10 min.
Further, in step S3, the polymer dispersed liquid crystal material is prepared by:
s31: based on the total weight of the polymer dispersed liquid crystal material, respectively taking 30-59.8% of nematic liquid crystal, 0.05-5% of chiral agent, 28.2-59.8% of light-cured monomer, 0.05-1% of photoinitiator, 0.05-1% of spacer particles and 0.05-5% of solvent, and stirring at the temperature of 60 +/-5 ℃ for 4 +/-0.5H;
and S32, standing at normal temperature for 2 +/-0.25H to obtain the polymer dispersed liquid crystal material.
The present invention advantageously contributes to effectively solving the above-mentioned problems. According to the liquid crystal dimming film, the nano silicon dioxide coating is attached to the surfaces of the first conductive film and the second conductive film, which are provided with the conductive substances, so that the transparency of the liquid crystal dimming film in a transparent state can be improved, and the polymer dispersed liquid crystal material is favorably spread in processing, so that the processing efficiency is favorably improved, and the product performance is favorably improved. In addition, the chiral agent is added in the polymer dispersed liquid crystal material, so that the response speed of the liquid crystal dimming film can be greatly improved. The preparation method of the liquid crystal dimming film has the characteristics of convenience in processing and high processing efficiency, has strong practicability and is suitable for being widely popularized.
[ description of the drawings ]
Fig. 1 is a schematic structural view of a liquid crystal light adjusting film of the present invention.
The ultraviolet-resistant film comprises a first conductive film 1, a first silicon dioxide coating layer 2, a polymer dispersed liquid crystal layer 3, a second silicon dioxide coating layer 4, a second conductive film 5, a first ultraviolet-resistant coating layer 6 and a second ultraviolet-resistant coating layer 7.
[ detailed description ] embodiments
The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.
Example 1
As shown in fig. 1, the liquid crystal light adjusting film of the present invention includes a first conductive film 1, a first silica coating layer 2, a polymer dispersed liquid crystal layer 3, a second silica coating layer 4, and a second conductive film 5. Further, it may further include a first uv-resistant coating 6 and a second uv-resistant coating 7.
As shown in fig. 1, a conductive material is disposed on one side surface of each of the first conductive film 1 and the second conductive film 5. The conductive substance may be a known conductive substance such as PEDOT or the like. The first conductive film 1 and the second conductive film 5 have the same basic structure, and each of the first conductive film 1 and the second conductive film 5 includes a substrate and a conductive substance, and the conductive substance is attached to one side surface of the substrate to form the first conductive film 1 and the second conductive film 5. The substrate is usually a transparent PET film, and the conductive material is usually attached to the surface of the substrate by vacuum plating. When the conductive substance is attached to the surface of the substrate, the surface of the conductive substance layer is not particularly flat at a microscopic level, which is not friendly to wetting and alignment of the polymer dispersed liquid crystal material.
As shown in fig. 1, the first silica coating layer 2 is provided on the surface of the first conductive film 1 on the side provided with the conductive substance, which is formed by plating a nano silica material on the surface of the first conductive film 1. The thickness of the first silica coating 2 is 50-250 μm. When the first silicon dioxide coating 2 is arranged on the first conductive film 1, the nano silicon dioxide material is filled in the surface of the conductive substance of the first conductive film 1 to fill the surface of the conductive substance, so that the whole surface is smoother, and the wetting and arrangement of the polymer dispersed liquid crystal material are facilitated. In other words, the first silicon dioxide coating 2 does not completely cover or cover the surface of the conductive material on the first conductive film 1, but fills the surface of the conductive material layer to make the whole surface more flat, and at the same time, does not affect the conductivity of the first conductive film 1.
As shown in fig. 1, the second silica coating layer 4 is provided on the surface of the second conductive film 5 on the side provided with the conductive substance, which is formed by plating a nano silica material on the surface of the second conductive film 5 on the side. The thickness of the first silica coating 3 is 50-250 μm. When the second silicon dioxide coating 4 is disposed on the second conductive film 5, the nano silicon dioxide material is filled in the surface of the conductive material of the second conductive film 5 to fill the surface of the conductive material, so that the whole surface is smoother and is beneficial to the infiltration and arrangement of the polymer dispersed liquid crystal material. In other words, the second silicon dioxide coating 4 does not completely cover or cover the surface of the conductive material on the second conductive film 5, but rather, the surface of the conductive material is filled to make the whole surface more flat, and at the same time, the conductive performance of the second conductive film 5 is not affected.
As shown in fig. 1, the polymer dispersed liquid crystal layer 3 is disposed between the first conductive film 1 and the second conductive film 5, and is in contact with the conductive material of the first conductive film 1 and the second conductive film 5, the first silica coating layer 2, and the second silica coating layer 4, respectively. The polymer dispersed liquid crystal layer 3 can be electrically energized through the first conductive film 1 and the second conductive film 5. The first silica coating 2 and the second silica coating 3 can facilitate the spreading of the polymer dispersed liquid crystal material in the polymer dispersed liquid crystal layer 3.
The polymer dispersed liquid crystal layer 3 is formed by curing a polymer dispersed liquid crystal material. The polymer dispersed liquid crystal material comprises the following components in percentage by weight:
nematic liquid crystal: 30 to 59.8 percent
A chiral agent: 0.05 to 5 percent
Photo-curing monomer: 28.2 to 59.8 percent
Photoinitiator (2): 0.05 to 1 percent
Spacer particles: 0.05 to 1 percent
Solvent: 0.05 to 5 percent.
The weight fractions of the above components are calculated as 100% of the total weight of the polymer dispersed liquid crystal material.
In this embodiment, the nematic liquid crystal is the nematic liquid crystal SLC100 manufactured by jiangsu and chengzi display technologies ltd.
The chiral agent can be selected from chiral agents with the following structural formula:
in the invention, the chiral agent is added into the polymer dispersed liquid crystal material in a certain proportion, so that the response speed of the liquid crystal dimming film can be greatly improved.
The light-cured monomer comprises one or more of acrylate monomers and vinyl ether monomers. For example, 4-hydroxybutyl vinyl ether, ethoxylated trimethylolpropane triacrylate, etc.
The photoinitiator comprises one or more of 2, 4, 6-trimethylbenzoylphenylphosphonic acid ethyl ester, 4- (phenylthio) phenyldiphenylsulfonium hexafluorophosphate, 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone and 2-hydroxy-2-methyl-1-phenylpropanone.
The spacer particles are particles with the particle size of 10-20 micrometers; in this embodiment, the particles with a particle size of 20 μm produced by Zhenjiang Aibang electronic technology, Inc. are selected.
The solvent is one or more of ethanol and isopropanol.
In addition, in order to enhance the performance of the liquid crystal light adjusting film, a first ultraviolet resistant coating 6 and a second ultraviolet resistant coating 7 may be further disposed on the outer side surfaces of the first conductive film 1 and the second conductive film 5, i.e., the side surfaces facing away from the conductive substance.
The first ultraviolet-resistant coating 6 is arranged on the surface of the first conductive film 1, which is opposite to the conductive substance; the second ultraviolet-resistant coating 7 is provided on a surface of the second conductive film 5 facing away from the conductive substance. The first ultraviolet-resistant coating layer 6 and the second ultraviolet-resistant coating layer 7 are a coating layer containing an ultraviolet absorber or an ultraviolet-shielding agent for absorbing or reflecting ultraviolet rays.
Thus, the liquid crystal light adjusting film of the present invention is formed.
Example 2
The preparation method of the liquid crystal dimming film comprises the following steps:
s1: selecting a PET film, and attaching a conductive substance to the inner surface of the PET film to form a first conductive film 1 and a second conductive film 5 respectively; in this step, the conductive material may be a known conductive material such as PEDOT. The conductive material may be attached to the PET film by a known process, for example, by attaching the conductive material to the PET film by vacuum plating to form the first conductive film 1 and the second conductive film 5.
S2: respectively attaching nano-silica materials to the surfaces of the first conductive film 1 and the second conductive film 5, which are provided with conductive substances; in this step, the nanosilicon dioxide material may be attached to the first conductive film 1 and the second conductive film 5 by a known process, for example, the nanosilicon dioxide material may be attached to the surfaces of the first conductive film 1 and the second conductive film 5 on which the conductive substance is disposed by vacuum plating. In this embodiment, the thickness of the silica coating formed by the nano carbon dioxide material is 50 to 250 μm.
In step S2, an ultraviolet-resistant coating may be applied to the surfaces of the first and second conductive films 1 and 5 that face away from the conductive material. The ultraviolet ray blocking coating is a coating layer containing an ultraviolet ray absorber or an ultraviolet ray shielding agent for absorbing or reflecting ultraviolet rays, and is coated on the outer surfaces of the first conductive film 1 and the second conductive film 5. In this embodiment, the surface square resistance of the ultraviolet-resistant coating is 100-400 Ω, and the thickness is 188 μm.
S3: uniformly applying a polymer dispersed liquid crystal material between the first conductive film 1 and the second conductive film 5, followed by curing by ultraviolet irradiation; the illumination intensity is 0.1-10mW/m2, and the curing time is 3-10 min; in the step, the preparation of the polymer dispersed liquid crystal material refers to the following steps:
s31: based on the total weight of the polymer dispersed liquid crystal material, respectively taking 30-59.8% of nematic liquid crystal, 0.05-5% of chiral agent, 28.2-59.8% of light-cured monomer, 0.05-1% of photoinitiator, 0.05-1% of spacer particles and 0.05-5% of solvent, and stirring for 4 +/-0.5H at the temperature of 60 +/-5 ℃;
and S32, standing at normal temperature for 2 +/-0.25H to obtain the polymer dispersed liquid crystal material.
In step S31, the nematic liquid crystal is the nematic liquid crystal SLC100 manufactured by jiangsu and chengzi display technologies ltd. In this example, 40% by weight of nematic liquid crystal was weighed. The chiral agent can be selected from chiral agents with the following structural formula:
in this example, 0.05% by weight of the chiral agent was weighed.
The photo-curing monomer comprises one or more of acrylate monomers and vinyl ether monomers, such as 4-hydroxybutyl vinyl ether, ethoxylated trimethylolpropane triacrylate, etc. In this example, 59.8% by weight of 4-hydroxybutyl vinyl ether was weighed out.
The photoinitiator comprises one or more of 2, 4, 6-trimethylbenzoylphenylphosphonic acid ethyl ester, 4- (phenylthio) phenyldiphenylsulfonium hexafluorophosphate, 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone and 2-hydroxy-2-methyl-1-phenylpropanone. In this example, 0.05% by weight of ethyl 2, 4, 6-trimethylbenzoylphenylphosphonate was weighed out.
The spacer particles are particles with the particle size of 10-20 micrometers; in this example, 0.05% by weight of particles having a particle size of 20 μm, which are manufactured by Zhenjiang Aibang electronics technologies, Inc., were weighed.
The solvent is one or more of ethanol and isopropanol. In this example, 0.05% by weight of ethanol was weighed.
After the polymer dispersed liquid crystal material is prepared by weighing the raw materials, the polymer dispersed liquid crystal material is uniformly coated between the first conductive film 1 and the second conductive film 5, so that the polymer dispersed liquid crystal material is in contact with the conductive substance and the nano silicon dioxide material. In the process, the nano silicon dioxide material can be beneficial to the infiltration and arrangement of the polymer dispersed liquid crystal material, so that the polymer dispersed liquid crystal material is easier to spread and is beneficial to implementation. In this example, 6mmin of ultraviolet light was irradiated at 5mW/m2 illuminance to cure the polymer dispersed liquid crystal material and form the polymer dispersed liquid crystal layer 3. After the polymer dispersed liquid crystal material is cured, the process proceeds to step S4:
in S4, conductive electrodes are formed on the first conductive film 1 and the second conductive film 5, and then a conduction test is performed to obtain a liquid crystal light adjusting film. In this step, the fabrication of the conductive electrode can refer to the known technology, and this embodiment is not described in detail.
Example 3
This embodiment is basically the same as embodiment 2, except that in this embodiment, the raw material parameters of step S3 are different from those of embodiment 2:
in this example, in step S3, 59.8% by weight of nematic liquid crystal, 5% by weight of chiral agent, 28.2% by weight of ethoxylated trimethylolpropane triacrylate, 1% by weight of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 1% by weight of spacer, and 5% by weight of isopropyl alcohol were weighed, stirred at 60 ℃ for 4H, and allowed to stand at room temperature for 2H to obtain the polymer-dispersed liquid crystal material. When the polymer dispersed liquid crystal material is prepared, the polymer dispersed liquid crystal material is uniformly applied between the first conductive film 1 and the second conductive film 5. In this example, 10mmin of ultraviolet light was irradiated at an illuminance of 0.1mW/m2 to cure the polymer dispersed liquid crystal material and form a polymer dispersed liquid crystal layer.
Example 4
This embodiment is basically the same as embodiment 2, except that in this embodiment, the raw material parameters of step S3 are different from those of embodiment 2:
in this example, in step S3, 30% by weight of nematic liquid crystal, 4% by weight of chiral agent, 59.8% by weight of ethoxylated trimethylolpropane triacrylate, 0.6% by weight of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 0.6% by weight of spacer, and 5% by weight of isopropyl alcohol were weighed, stirred at 65 ℃ for 3.5H, and left to stand at room temperature for 2.25H to obtain the polymer-dispersed liquid crystal material. When the polymer dispersed liquid crystal material is prepared, the polymer dispersed liquid crystal material is uniformly applied between the first conductive film 1 and the second conductive film 5. In this example, ultraviolet light was irradiated at an illuminance of 10mW/m2 for 3min to cure the polymer dispersed liquid crystal material and form a polymer dispersed liquid crystal layer.
Example 5
This embodiment is basically the same as embodiment 2, except that in this embodiment, the raw material parameters of step S3 are different from those of embodiment 2:
in this example, in step S3, 50% by weight of nematic liquid crystal, 5% by weight of chiral agent, 40% by weight of ethoxylated trimethylolpropane triacrylate, 1% by weight of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 1% by weight of spacer, and 3% by weight of isopropyl alcohol were weighed, stirred at 55 ℃ for 4.5H, and left to stand at room temperature for 1.75H to obtain the polymer-dispersed liquid crystal material. When the polymer dispersed liquid crystal material is prepared, the polymer dispersed liquid crystal material is uniformly applied between the first conductive film 1 and the second conductive film 5. In this example, the polymer dispersed liquid crystal material was cured by irradiating with ultraviolet light at an illuminance of 4mW/m2 for 8min to form a polymer dispersed liquid crystal layer.
For the liquid crystal dimming film and the preparation method thereof, as the first silicon dioxide layer and the second silicon dioxide layer are arranged on the sides, provided with the conductive substances, of the first conductive film 1 and the second conductive film 5, the transparency of the liquid crystal dimming film can be improved, and the wettability of the first conductive film 1, the second conductive film 5 and the polymer dispersed liquid crystal material can be enhanced, so that the liquid crystal dimming film is more beneficial to processing.
The light transmittance of the PET film as the base material of the first and second conductive films 1 and 5 is usually about 95%, and the light transmittance thereof is usually about 88% when a conductive material is attached to the PET film; when the first silicon dioxide layer and the second silicon dioxide layer are attached to the conductive substance sides of the first conductive film 1 and the second conductive film 5, the nano silicon dioxide material can not only fill up the uneven surfaces of the conductive substances, but also match the refractive index, thereby increasing the transparency: the refractive index of the PET film is about 1.5, the refractive index of the conductive substance is about 1.7, the refractive index of the nano silicon dioxide material is about 1.5, and the nano silicon dioxide material is close to the refractive index of the PET film, so that the nano silicon dioxide material can be matched with the refractive index of the PET film, the purpose of reflection reducing is achieved, and the transparency of the liquid crystal dimming film is improved.
On the other hand, when the polymer dispersed liquid crystal material is filled between the first conductive film 1 and the second conductive film 5, if the nano-silica materials, i.e., the first silica layer and the second silica layer, are not attached to the first conductive film 1 and the second conductive film 5, the polymer dispersed liquid crystal material is not easily spread on the first conductive film 1 and the second conductive film 5, which increases the processing difficulty; when the nano silicon dioxide material is attached to the first conductive film 1 and the second conductive film 5, the nano silicon dioxide material has good wettability to the polymer dispersed liquid crystal material, and the polymer dispersed liquid crystal material is more easily spread between the first conductive film 1 and the second conductive film 5, so that the polymer dispersed liquid crystal material is more uniformly and freely arranged, and thus, the processing and the product performance improvement are facilitated.
While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. A liquid crystal light adjusting film, comprising:
a first conductive film (1) having a conductive material on one surface thereof;
a second conductive film (5) having a conductive material on one surface thereof;
a first silicon dioxide coating (2) which is arranged on the surface of one side of the first conductive film (1) provided with the conductive substance;
a second silicon dioxide coating (4) provided on the surface of the second conductive film (5) on the side provided with the conductive substance;
and the polymer dispersed liquid crystal material is arranged between the first conductive film (1) and the second conductive film (5) and is respectively contacted with the conductive substance, the first silicon dioxide coating (2) and the second silicon dioxide coating (4).
2. The liquid crystal dimming film according to claim 1, wherein:
the first silicon dioxide coating (2) is formed by electroplating a nano silicon dioxide material on the surface of one side of the first conductive film (1) provided with a conductive substance;
the second silica coating layer (4) is formed by plating a nanosilicon dioxide material on a surface of the second conductive film (5) on which the conductive substance is provided.
3. The liquid crystal dimming film according to claim 1, wherein the first silica coating layer (2) is filled in a surface of the first conductive film (1); the second silicon dioxide coating (4) is filled in the surface of the second conductive film (5).
4. The liquid crystal dimming film of claim 1, wherein said polymer dispersed liquid crystal material comprises the following components, calculated as 100% by weight of the total polymer dispersed liquid crystal material:
nematic liquid crystal: 30 to 59.8 percent
A chiral agent: 0.05 to 5 percent
Photo-curing monomer: 28.2 to 59.8 percent
Photoinitiator (2): 0.05 to 1 percent
Spacer particles: 0.05 to 1 percent
Solvent: 0.05 to 5 percent.
5. The liquid crystal dimming film of claim 4, wherein the photo-curable monomer comprises one or more of an acrylate monomer and a vinyl ether monomer.
6. The liquid crystal light adjusting film of claim 4, wherein the photoinitiator comprises one or more of ethyl 2, 4, 6-trimethylbenzoylphenylphosphonate, 4- (phenylthio) phenyldiphenylsulfonium hexafluorophosphate, 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-one, 2-hydroxy-2-methyl-1-phenylpropanone.
7. The liquid crystal dimming film according to claim 4, wherein the spacer is a particulate having a particle size of 10 to 20 μm; the solvent is one or more of ethanol and isopropanol.
8. The liquid crystal dimming film of claim 1,
a first ultraviolet-resistant coating (6) is arranged on the surface of the first conductive film (1) opposite to the first silicon dioxide coating (2);
and a second ultraviolet resistant coating (7) is arranged on the surface of the second conductive film (5) opposite to the second silicon dioxide coating (4).
9. A method for producing a liquid crystal light-adjusting film according to any one of claims 1 to 8, comprising the steps of:
s1: selecting a PET film, and attaching a conductive substance to the inner surface of the PET film to form a first conductive film (1) and a second conductive film (5) respectively;
s2: respectively attaching nano-silica materials on the surfaces of the first conductive film (1) and the second conductive film (5) provided with conductive substances to form a first silica coating (2) and a second silica coating (4);
s3: uniformly coating a polymer dispersed liquid crystal material between a first conductive film (1) and a second conductive film (5), and then curing by ultraviolet irradiation; the illumination intensity is 0.1-10mW/m2The curing time is 3-10 min.
10. The method for producing a liquid crystal light-adjusting film according to claim 9, wherein in step S3, the polymer dispersed liquid crystal material is produced by:
s31: based on the total weight of the polymer dispersed liquid crystal material, respectively taking 30-59.8% of nematic liquid crystal, 0.05-5% of chiral agent, 28.2-59.8% of light-cured monomer, 0.05-1% of photoinitiator, 0.05-1% of spacer particles and 0.05-5% of solvent, and stirring at the temperature of 60 +/-5 ℃ for 4 +/-0.5H;
and S32, standing at normal temperature for 2 +/-0.25H to obtain the polymer dispersed liquid crystal material.
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