CN112987378B - Reverse light modulation film and preparation method thereof - Google Patents
Reverse light modulation film and preparation method thereof Download PDFInfo
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- CN112987378B CN112987378B CN202110326264.6A CN202110326264A CN112987378B CN 112987378 B CN112987378 B CN 112987378B CN 202110326264 A CN202110326264 A CN 202110326264A CN 112987378 B CN112987378 B CN 112987378B
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing
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Abstract
The invention discloses a reverse light adjusting film and a preparation method thereof, wherein an upper flexible transparent conducting layer, an upper horizontal alignment layer, a positive liquid crystal layer, a lower horizontal alignment layer and a lower flexible transparent conducting layer of the reverse light adjusting film are sequentially arranged; the reverse light adjusting film has a transparent state and a frosted state; in a transparent state, liquid crystal molecules of the positive liquid crystal layer are horizontally arranged and distributed; in the frosted state, the liquid crystal molecules of the positive liquid crystal layer are vertically arranged and distributed. The reverse light modulation film disclosed by the invention adopts the positive liquid crystal layer, so that the product cost can be greatly reduced. Moreover, the preparation process is relatively simple, the horizontal alignment only needs a rubbing machine to rub the alignment layer, the process parameter equipment is relatively mature, and the product yield is high. In addition, the horizontal alignment has a better anchoring effect than the vertical alignment, and thus the shielding effect is more excellent than the vertical alignment. And, the solubility of the positive liquid crystal to the polymer is better than that of the negative liquid crystal, thereby contributing to further improvement of the adhesion of the reverse-tone film.
Description
Technical Field
The invention relates to the technical field of light adjusting films, in particular to a reverse light adjusting film and a preparation method thereof.
Background
Polymer Dispersed Liquid Crystal (PDLC) is a Liquid Crystal Dispersed in an organic solid Polymer matrix in small micron-sized droplets. Since the optical axis of the small droplets composed of liquid crystal molecules is freely oriented, the refractive index thereof is not matched with that of the matrix, and light is strongly scattered by the droplets while passing through the matrix to assume an opaque milky white state or a translucent state. Application of an electric field can adjust the optical axis orientation of the liquid crystal droplets, and the PDLC assumes a transparent state when the refractive indices of the droplets and the matrix are matched. The electric field is removed and the liquid crystal droplets restore the original state of astigmatism, thus achieving the switching of the two states. Therefore, PDLC is a material having electro-optical response characteristics.
The PDLC material can be used for preparing products such as a light adjusting film, intelligent light adjusting glass, an electronic price tag, a display and the like, and particularly the light adjusting film is widely applied to the field of buildings. The light adjusting film can be divided into a positive light adjusting film and a reverse light adjusting film. The dimming film is in a foggy state when not powered on, and is in a transparent state when powered on, and is called a positive dimming film. Compared with a positive light modulation film, the reverse light modulation film is in a transparent state when not powered and in a fog state when powered, and the visual angle and the driving voltage performance are obviously improved.
Compared with a positive light modulation film, the reverse light modulation film has the main advantages of energy conservation, more ideal transparent effect and better visual effect, so that the application range and the requirement of the reverse light modulation film are wider. However, the existing reverse light-adjusting film has the disadvantages that the haze state is not as good as that of the positive light-adjusting film, and the alignment layer is required to align the initial state of the liquid crystal molecules, so that the cost and the technical difficulty are increased. Therefore, the reverse light adjusting film is not a mature commercial product in the market at present and is still in the front research and development stage.
The existing reverse light adjusting film is prepared by coating a vertical alignment layer on a flexible conductive film, adopting negative liquid crystal and adding a certain amount of polymer for illumination. This production method has the following problems: firstly, materials of a vertical alignment layer are all imported materials from Japan, and the price of negative liquid crystal is relatively high, so that the cost of the reverse light modulation film is high, and the reverse light modulation film is difficult to be applied on a large scale; secondly, the vertical alignment layer controls the initial angle of the molecules of the alignment layer by polarizing UV light, so that the equipment and technical requirements are high; thirdly, the anchoring effect of vertical alignment is poor, the thickness of the liquid crystal molecular layer in the light modulation film is generally 15-30um, and under the thickness, the anchoring force of the liquid crystal molecules near the middle of the film layer is not enough to keep the liquid crystal molecules in the same orientation as the liquid crystal molecules at the edge of the alignment layer, so that the shielding effect during power-on is not ideal.
Therefore, how to provide a reverse light modulation film which can effectively reduce the cost and the preparation difficulty of the reverse light modulation film and improve the shielding effect becomes a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a novel technical scheme of a reverse light adjusting film, which can effectively reduce the cost and the preparation difficulty of the reverse light adjusting film and improve the shielding effect.
According to a first aspect of the present invention, there is provided a reverse light adjusting film.
The reverse light modulation film comprises an upper flexible transparent conducting layer, an upper horizontal alignment layer, a positive liquid crystal layer, a lower horizontal alignment layer and a lower flexible transparent conducting layer, wherein the upper flexible transparent conducting layer, the upper horizontal alignment layer, the positive liquid crystal layer, the lower horizontal alignment layer and the lower flexible transparent conducting layer are sequentially arranged, and adjacent layers are connected in a bonding mode;
the reverse light adjusting film has a transparent state and a frosted state;
in the transparent state, the reverse light adjusting film is not electrified, and liquid crystal molecules of the positive liquid crystal layer are horizontally arranged and distributed;
and in the frosted state, the reverse dimming film is electrified, and liquid crystal molecules of the positive liquid crystal layer are vertically arranged and distributed.
Optionally, the material of the upper flexible transparent layer conductive layer and/or the base layer of the lower flexible transparent conductive layer is a PET or polyimide base film, and the material of the upper flexible transparent layer conductive layer and/or the conductive layer of the lower flexible transparent conductive layer is one of an ITO film, a polymer conductive layer, a nano silver conductive layer, and a graphene conductive layer.
Optionally, the upper horizontal alignment layer and/or the lower horizontal alignment layer includes a liquid crystal alignment film, and the liquid crystal alignment film is made of one of polyimide, nylon, polyvinyl alcohol, polyurea, and polyamide.
Optionally, the pretilt angle of the upper horizontal alignment layer and/or the lower horizontal alignment layer is 0.5-10 degrees, and the thickness is 5-300 nm.
Optionally, the positive liquid crystal layer is composed of a liquid crystal material, a polymerizable monomer, a diluent, a photoinitiator, a spacer and a phosphorus-containing additive; wherein, the first and the second end of the pipe are connected with each other,
the liquid crystal material is 50% -70% of the total weight of the positive liquid crystal layer, the polymerizable monomer is 3% -30% of the total weight of the positive liquid crystal layer, the diluent is 10% -30% of the total weight of the positive liquid crystal layer, the photoinitiator is 0.1% -5% of the total weight of the positive liquid crystal layer, the spacer is 1-3% of the total weight of the positive liquid crystal layer, and the phosphorus-containing additive is 1-3% of the total weight of the positive liquid crystal layer.
Optionally, the liquid crystal material is a positive liquid crystal mixture, and the birefringence value delta n of the liquid crystal material is 0.12-0.25, n o 1.50-1.53;
the polymerizable monomer is at least one of RM257, LC242, LC1057 and C6M;
the diluent is at least one of hydroxypropyl acrylate, hydroxypropyl methacrylate, lauryl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1,6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy acrylate, ethylphenoxy methacrylate, 3,3,5-trimethylcyclohexyl acrylate, propane trimethacrylate, trimethylolpropane tris (3-mercaptopropionate), benzyl acrylate, benzyl methacrylate, hexyl acrylate, hexyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl methacrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, glycidyl acrylate, 2,2,2-trifluoroethyl acrylate, tetrahydrofuran methacrylate, 2-hydroxyethyl acrylate, 2-ethyl acrylate monomer, 2,2,2-trifluoroethyl methacrylate, ethylene glycol acetoacetate methacrylate, cyclohexane acrylate, cyclohexane methacrylate, and dodecyl acrylate;
the photoinitiator is at least one of an organic peroxide initiator, an inorganic peroxide initiator, an azo initiator and a redox initiator;
the spacer is a plurality of rigid microbeads with the same diameter, and the diameter of each rigid microbead is 10-40 μm;
the phosphorus-containing additive is at least one of phosphorus-containing acrylate and phosphate.
Optionally, the thickness of the positive liquid crystal layer is 15 μm to 30 μm.
The invention also provides a preparation method of the reverse light modulation film.
The preparation method of the reverse light modulation film comprises the following steps:
step (1): attaching an alignment layer on the flexible transparent conducting layer in a coating, vacuum evaporation, mask or relief printing mode;
step (2): carrying out heat treatment curing on the alignment layer at 50-150 ℃;
and (3): performing horizontal rubbing alignment treatment on the alignment layer to obtain a horizontal alignment layer, wherein the horizontal rubbing treatment is performed by a rubbing machine, the rotating speed of a roller is 400-1500 rpm, the moving speed of a substrate is 20-200 mm/s, and the pressing amount of a roller is 1.0-4.0 mm;
and (4): and after positive liquid crystal is coated on the horizontal alignment layer of one flexible transparent conducting layer, covering the horizontal alignment layer of the other flexible transparent conducting layer on the flexible transparent conducting layer coated with the positive liquid crystal, and carrying out curing treatment to obtain the reverse light adjusting film.
Optionally, the horizontal rubbing alignment treatment in the step (3) is performed twice.
Optionally, the parameters of the curing treatment in step (4) are as follows:
at 2mW/cm 2 -40mW/cm 2 Curing for 2min-5min under the energy of the ultraviolet lamp.
The reverse light modulation film adopts the positive liquid crystal layer, the cost of the positive liquid crystal is lower than that of the negative liquid crystal, and therefore the product cost can be greatly reduced. Moreover, the preparation process is relatively simple, the vertical alignment needs polarized UV light curing, the equipment, process parameters and technical requirements are high, the horizontal alignment only needs a rubbing machine to rub the alignment layer, the process parameters and equipment are relatively mature, and the product yield is high. In addition, the horizontal alignment has a better anchoring effect than the vertical alignment, and thus the shielding effect is more excellent than the vertical alignment. And, the positive liquid crystal has better solubility to the polymer than the negative liquid crystal, so the polymer proportion thereof can be increased, thereby contributing to further improvement of the adhesive force of the reverse-tone film.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of an embodiment of a reverse light modulation film according to the present disclosure.
The figures are labeled as follows:
an upper flexible transparent conducting layer-1, an upper horizontal alignment layer-2, a positive liquid crystal layer-3, a lower horizontal alignment layer-4 and a lower flexible transparent conducting layer-5.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
As shown in fig. 1, the reverse light adjusting film of the present disclosure includes an upper flexible transparent conductive layer 1, an upper horizontal alignment layer 2, a positive liquid crystal layer 3, a lower horizontal alignment layer 4, and a lower flexible transparent conductive layer 5. The upper flexible transparent conducting layer 1, the upper horizontal alignment layer 2, the positive liquid crystal layer 3, the lower horizontal alignment layer 4 and the lower flexible transparent conducting layer 5 are sequentially arranged, and adjacent layers are connected in a bonding mode.
The reverse light adjusting film has a transparent state and a frosted state.
In the transparent state, the reverse light-adjusting film is not energized, and the liquid crystal molecules of the positive liquid crystal layer 3 are horizontally arranged.
In the frosted state, the reverse dimming film is electrified, and the liquid crystal molecules of the positive liquid crystal layer 3 are vertically arranged and distributed.
The reverse light modulation film disclosed by the invention ensures that liquid crystal molecules are horizontally arranged in a power-off mode by utilizing the alignment effect of the horizontal alignment layer, and the liquid crystal molecules have consistent refractive indexes with polymerizable monomers and have higher transparency; when the light source is electrified, the liquid crystal molecules are vertically arranged, the refractive indexes of the liquid crystal molecules and the polymerizable monomer are inconsistent, so that the liquid crystal molecules are frosted, the shielding effect is strong, and the defects of high energy consumption, poor viewing angle and non-ideal transparent state of the conventional forward light adjusting film are overcome.
The reverse light modulation film disclosed by the disclosure adopts the positive liquid crystal layer 3, the cost of the positive liquid crystal is lower than that of the negative liquid crystal, and therefore the product cost can be greatly reduced. Moreover, the preparation process is relatively simple, the vertical alignment needs polarized UV light curing, the equipment, process parameters and technical requirements are high, the horizontal alignment only needs a rubbing machine to rub the alignment layer, the process parameters and equipment are relatively mature, and the product yield is high. In addition, the horizontal alignment has a better anchoring effect than the vertical alignment, and thus the shielding effect is more excellent than the vertical alignment. And the solubility of the positive liquid crystal to the polymer is better than that of the negative liquid crystal, so that the polymer proportion can be increased, and the adhesion of the reverse light modulation film is further improved.
In one embodiment of the reverse light modulation film of the present disclosure, the material of the base layer of the upper flexible transparent conductive layer 1 and/or the lower flexible transparent conductive layer 5 is a PET or polyimide base film. The material of the conductive layer of the upper flexible transparent layer conductive layer 1 and/or the conductive layer of the lower flexible transparent layer conductive layer 5 is one of an ITO film, a polymer conductive layer, a nano-silver conductive layer and a graphene conductive layer. The horizontal alignment layer is in contact with the conductive layer of the flexible transparent layer.
In one embodiment of the reverse light adjusting film of the present disclosure, the upper horizontal alignment layer 2 and/or the lower horizontal alignment layer 4 includes a liquid crystal alignment film. The material of the liquid crystal orientation film is one of polyimide, nylon, polyvinyl alcohol, polyurea and polyamide.
In one embodiment of the reverse light adjusting film of the present disclosure, the pretilt angle of the upper horizontal alignment layer 2 and/or the lower horizontal alignment layer 4 is 0.5 ° to 10 ° and the thickness is 5nm to 300nm.
In one embodiment of the reverse light modulation film of the present disclosure, the positive liquid crystal layer 3 is composed of a liquid crystal material, a polymerizable monomer, a diluent, a photoinitiator, a spacer, and a phosphorus-containing additive; wherein the content of the first and second substances,
the weight of the liquid crystal material is 50% -70% of the total weight of the positive liquid crystal layer 3, the weight of the polymerizable monomer is 3% -30% of the total weight of the positive liquid crystal layer 3, the weight of the diluent is 10% -30% of the total weight of the positive liquid crystal layer 3, the weight of the photoinitiator is 0.1% -5% of the total weight of the positive liquid crystal layer 3, the weight of the spacer is 1% -3% of the total weight of the positive liquid crystal layer 3, and the weight of the phosphorus-containing additive is 1% -3% of the total weight of the positive liquid crystal layer 3.
Further, the liquid crystal material is a positive liquid crystal mixture, and the birefringence value Deltan of the liquid crystal material is 0.12-0.25 o 1.50-1.53;
the polymerizable monomer is at least one of RM257, LC242, LC1057 and C6M;
the diluent is at least one of hydroxypropyl acrylate, hydroxypropyl methacrylate, lauryl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1,6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy acrylate, ethylphenoxy methacrylate, 3,3,5-trimethylcyclohexyl acrylate, propanetriol triacrylate, trimethylolpropane tris (3-mercaptopropionate), benzyl acrylate, benzyl methacrylate, hexyl acrylate, hexyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl methacrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, glycidyl acrylate, 2,2,2-trifluoroethyl acrylate, tetrahydrofuran methacrylate, 2-hydroxyethyl acrylate, 2-ethyl acrylate monomer, 2,2,2-trifluoroethyl methacrylate, ethylene glycol acetoacetate methacrylate, cyclohexane acrylate, cyclohexane methacrylate, and dodecyl acrylate;
the photoinitiator is at least one of an organic peroxide initiator, an inorganic peroxide initiator, an azo initiator and a redox initiator;
the spacer is a plurality of rigid microbeads with the same diameter, and the diameter of each rigid microbead is 10-40 μm;
the phosphorus-containing additive is at least one of phosphorus-containing acrylate and phosphate.
In one embodiment of the reverse light adjusting film of the present disclosure, the thickness of the positive liquid crystal layer 3 is 15 μm to 30 μm.
The disclosure also provides a preparation method of the reverse light modulation film, which comprises the following steps:
step (1): and attaching an alignment layer on the flexible transparent conductive layer by coating, vacuum evaporation, mask or relief printing.
Step (2): and carrying out heat treatment curing on the alignment layer at 50-150 ℃.
And (3): and performing horizontal rubbing alignment treatment on the alignment layer to obtain the horizontal alignment layer, wherein the horizontal rubbing treatment is performed by a rubbing machine, the rotating speed of a roller is 400-1500 rpm, the moving speed of a substrate is 20-200 mm/s, and the pressing amount of a roller is 1.0-4.0 mm.
In order to achieve better alignment effect, the horizontal rubbing alignment treatment in step (3) is performed twice.
And (4): and after positive liquid crystal is coated on the horizontal alignment layer of one flexible transparent conducting layer, covering the horizontal alignment layer of the other flexible transparent conducting layer on the flexible transparent conducting layer coated with the positive liquid crystal, and carrying out curing treatment to obtain the reverse light adjusting film.
The parameters of the curing process in step (4) may be as follows:
at 2mW/cm 2 -40mW/cm 2 Curing for 2min-5min under the energy of the ultraviolet lamp.
The experimental procedures used in the following examples are conventional unless otherwise specified, the materials and reagents used are commercially available unless otherwise specified, and the equipment used in the experiments are well known to those skilled in the art.
Example 1
1) Spreading the ITO conductive layer with the sheet resistance of 100 omega/□, the visible light transmittance of 82 percent and the haze of 0.7 percent on a PET substrate flat coating table, setting the coating machine speed to be 20mm/s, coating a polyimide alignment layer with the thickness of 80nm, and putting the polyimide alignment layer into an oven to be cured for 5min at the temperature of 120 ℃;
2) Setting the moving speed of the substrate coated with the alignment layer in the step 1) to be 60mm/s, the rotating speed of a roller to be 800rpm, the pressing amount of the roller to be 2.35mm, the rotating direction of the roller to be anticlockwise, the moving direction of the substrate to be a sheet row, and repeating 2 times to perform horizontal rubbing alignment to obtain a horizontal alignment layer with a pretilt angle of 5.3 degrees;
3) Flatly paving the base material aligned in the step 2) on a coating table, setting the speed of a coating machine to be 20mm/s, dripping PDLC Liq1 at a scraper coating head, starting a start button, and coating, wherein the PDLC Liq1 comprises the following components: 15% of polymerizable monomer LC242, 20% of 1, 6-hexanediol diacrylate, 64.7% of liquid crystal material SL-79 (Chengzonghua display materials Co., ltd.), 0.1% of photoinitiator UV184, 1% o of spacer (10 um), 1% o of phosphorus-containing additive glyceric acid dimethacrylate;
4) Uniformly coating the other substrate prepared in the step 2) on the diaphragm prepared in the step 3), and then placing the other substrate in an ultraviolet curing machine with the mass of 5mW/cm 2 Curing for 2min to obtainThe reverse light modulation Film-1.
Example 2
1) Spreading the ITO conductive layer with the sheet resistance of 100 omega/□ on a coating table, wherein the visible light transmittance is 82 percent, the haze is 0.7 percent, the PET substrate is paved on the coating table, the speed of a coating machine is set to be 20mm/s, a polyimide alignment layer with the thickness of 80nm is coated, and the ITO conductive layer is placed in an oven to be cured for 5min at the temperature of 120 ℃;
2) Setting the moving speed of the substrate coated with the alignment layer in the step 1) to be 60mm/s, the rotating speed of a roller to be 800rpm, the pressing amount of the roller to be 2.35mm, the rotating direction of the roller to be anticlockwise, the moving direction of the substrate to be a sheet row, and repeating 2 times to perform horizontal rubbing alignment to obtain a horizontal alignment layer with a pretilt angle of 5.3 degrees;
3) Flatly paving the base material aligned in the step 2) on a coating table, setting the speed of a coating machine to be 20mm/s, dripping PDLC Liq2 at a scraper coating head, starting a start button, and coating, wherein the PDLC Liq2 comprises the following components: 20% of polymerizable monomer RM257, 20% of 3, 5-trimethylcyclohexyl acrylate, 59.1% of liquid-crystal material SLC1717 (honesty display materials, ltd.), 0.5% of photoinitiator UV184, 2% o of spacers (15 um), 2% o of the phosphorus-containing additive acryloyloxyethylphenyl phosphate;
4) Uniformly coating the other substrate prepared in the step 2) on the diaphragm prepared in the step 3), and then placing the other substrate in an ultraviolet curing machine with the mass of 5mW/cm 2 Curing for 2min to obtain the reverse light modulation Film-2.
Comparative example 1
The commercial forward light modulation Film product Film-3.
Comparative example 2
The negative liquid crystal reverse light modulation Film product Film-4 is sold in the market.
The conditions for detecting the performance of the PDLC light modulation film were as follows:
transmittance, drive voltage: WGT-S transmittance/haze tester.
TABLE 1 Film-1 to Film-4 Performance test results
The performance test results of the PDLC light modulation films Film-1 to Film-4 are shown in Table 1. As can be seen from table 1, the reverse direction light-adjusting films Film-1 and Film-2 have slightly inferior haze masking ability compared with the commercial forward direction light-adjusting Film product Film-3, but the on state thereof is significantly brighter, the driving voltage is greatly reduced, and the adhesive force is significantly improved. Because the film is a reverse light modulation film, under the transparent state with wide requirements, no voltage is required to be applied, and therefore, better guarantee is provided on the aspects of energy consumption and safety. Compared with a negative liquid crystal reverse dimming Film product Film-4, although the on-state transmittance and the driving voltage are relatively close, the fog-state shielding performance is obviously improved, and the adhesive force is greatly improved. Aiming at the condition that forward PDLC products are available in the market at present, the reverse light modulation films Film-1 and Film-2 products have obviously better applicability.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. A reverse light modulation film is characterized by comprising an upper flexible transparent conducting layer, an upper horizontal alignment layer, a positive liquid crystal layer, a lower horizontal alignment layer and a lower flexible transparent conducting layer, wherein the upper flexible transparent conducting layer, the upper horizontal alignment layer, the positive liquid crystal layer, the lower horizontal alignment layer and the lower flexible transparent conducting layer are sequentially arranged, adjacent layers are bonded and connected, the positive liquid crystal layer is composed of a liquid crystal material, a polymerizable monomer, a diluent, a photoinitiator, a spacer and a phosphorus-containing additive, the thickness of the positive liquid crystal layer is 15-30 mu m, the upper horizontal alignment layer and the lower horizontal alignment layer are subjected to horizontal friction alignment treatment, the horizontal friction alignment treatment is implemented by a friction machine, the rotating speed of a roller is 400-1500 rpm, the moving speed of a substrate is 20-200 mm/s, and the pressing amount of a roller is 1.0-4.0 mm; wherein the content of the first and second substances,
the liquid crystal material accounts for 50-70% of the total weight of the positive liquid crystal layer, the polymerizable monomer accounts for 3-30% of the total weight of the positive liquid crystal layer, the diluent accounts for 10-30% of the total weight of the positive liquid crystal layer, the photoinitiator accounts for 0.1-5% of the total weight of the positive liquid crystal layer, the spacer accounts for 1-3% of the total weight of the positive liquid crystal layer, and the phosphorus-containing additive accounts for 1-3% of the total weight of the positive liquid crystal layer;
the reverse light adjusting film has a transparent state and a frosted state;
in the transparent state, the reverse light adjusting film is not electrified, and liquid crystal molecules of the positive liquid crystal layer are horizontally arranged and distributed;
and in the frosted state, the reverse dimming film is electrified, and liquid crystal molecules of the positive liquid crystal layer are vertically arranged and distributed.
2. The reverse light modulation film according to claim 1, wherein the base layer of the upper flexible transparent layer conductive layer and/or the lower flexible transparent conductive layer is made of a PET or polyimide base film, and the conductive layer of the upper flexible transparent layer conductive layer and/or the lower flexible transparent conductive layer is made of one of an ITO film, a polymer conductive layer, a nano silver conductive layer, and a graphene conductive layer.
3. The reverse light modulation film of claim 1, wherein the upper horizontal alignment layer and/or the lower horizontal alignment layer comprises a liquid crystal alignment film made of one of polyimide, nylon, polyvinyl alcohol, polyurea, and polyamide.
4. The reverse light adjusting film according to claim 1, wherein the pretilt angle of the upper horizontal alignment layer and/or the lower horizontal alignment layer is 0.5 ° to 10 ° and the thickness is 5nm to 300nm.
5. A reverse light adjusting film according to claim 1, wherein the liquid crystal material is a positive liquid crystal mixture, and the liquid crystal material has a birefringence value Δ n of 0.12 to 0.25,n o 1.50-1.53;
the polymerizable monomer is at least one of RM257, LC242, LC1057 and C6M;
the diluent is at least one of hydroxypropyl acrylate, hydroxypropyl methacrylate, lauryl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1,6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy acrylate, ethylphenoxy methacrylate, 3,3,5-trimethylcyclohexyl acrylate, propane trimethacrylate, trimethylolpropane tris (3-mercaptopropionate), benzyl acrylate, benzyl methacrylate, hexyl acrylate, hexyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl methacrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, glycidyl acrylate, 2,2,2-trifluoroethyl acrylate, tetrahydrofuran methacrylate, 2-hydroxyethyl acrylate, 2-ethyl acrylate monomer, 2,2,2-trifluoroethyl methacrylate, ethylene glycol acetoacetate methacrylate, cyclohexane acrylate, cyclohexane methacrylate, and dodecyl acrylate;
the photoinitiator is at least one of an organic peroxide initiator, an inorganic peroxide initiator, an azo initiator and a redox initiator;
the spacer is a plurality of rigid microbeads with the same diameter, and the diameter of each rigid microbead is 10-40 μm;
the phosphorus-containing additive is at least one of phosphorus-containing acrylate and phosphate.
6. A method of making a reverse-direction light-modulating film according to any one of claims 1 to 5 comprising the steps of:
step (1): an alignment layer is attached to the flexible transparent conducting layer in a coating, vacuum evaporation, mask or relief printing mode;
step (2): carrying out heat treatment curing on the alignment layer at 50-150 ℃;
and (3): performing horizontal rubbing alignment treatment on the alignment layer to obtain a horizontal alignment layer, wherein the horizontal rubbing treatment is performed by a rubbing machine, the rotating speed of a roller is 400-1500 rpm, the moving speed of a substrate is 20-200 mm/s, and the pressing amount of a roller is 1.0-4.0 mm;
and (4): and after positive liquid crystal is coated on the horizontal alignment layer of one flexible transparent conducting layer, covering the horizontal alignment layer of the other flexible transparent conducting layer on the flexible transparent conducting layer coated with the positive liquid crystal, and carrying out curing treatment to obtain the reverse light adjusting film.
7. The method of producing a reverse light-adjusting film according to claim 6, wherein the horizontal rubbing alignment treatment in the step (3) is performed twice.
8. The method of producing a reverse light-adjusting film according to claim 6, wherein the parameters of the curing treatment in the step (4) are as follows:
at 2mW/cm 2 -40mW/cm 2 Curing for 2min-5min under the energy of the ultraviolet lamp.
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| CN107577067A (en) * | 2017-08-18 | 2018-01-12 | 深圳市国华光电科技有限公司 | A kind of light modulation device and its light regulation method |
| CN109358445A (en) * | 2018-12-10 | 2019-02-19 | 珠海兴业新材料科技有限公司 | A kind of reversed light modulation film and preparation method |
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