CN110286511B - Liquid crystal handwriting board film containing large HTP value chiral agent and preparation method thereof - Google Patents
Liquid crystal handwriting board film containing large HTP value chiral agent and preparation method thereof Download PDFInfo
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- CN110286511B CN110286511B CN201910537137.3A CN201910537137A CN110286511B CN 110286511 B CN110286511 B CN 110286511B CN 201910537137 A CN201910537137 A CN 201910537137A CN 110286511 B CN110286511 B CN 110286511B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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Abstract
The invention discloses a liquid crystal handwriting board film containing a chiral agent with a large HTP value and a preparation method thereof, relating to the technical field of liquid crystal handwriting material preparation; the liquid crystal handwriting board film containing the chiral agent with the large HTP value comprises an upper matrix layer, a bottom matrix layer and cholesteric liquid crystal, wherein the cholesteric liquid crystal is clamped between the upper matrix layer and the bottom matrix layer; the cholesteric liquid crystal is prepared by uniformly mixing the following raw materials in parts by weight and then carrying out UV curing: 40-90 parts of liquid crystal microdroplets, 10-60 parts of adhesive and 0.1-0.3 part of spacer powder. The handwriting board has the characteristics of pressure sensing of color handwriting, realization of handwriting display, no need of power supply maintenance of handwriting and the like, and can be used as tools such as a children drawing board, a family message board, a teaching aid and the like.
Description
Technical Field
The invention relates to the technical field of preparation of liquid crystal handwriting materials, in particular to a liquid crystal handwriting board film containing a chiral agent with a large HTP value and a preparation method thereof.
Background
The children drawing book and the family message book are paper generally, but the paper can not be written repeatedly and can not be made into transparent paper, so that the drawing function of the children drawing book can not be realized.
The essential writing tools in the teaching process are generally a blackboard, a whiteboard and the like, and the blackboard is very easy to generate dust due to the fact that chalk is needed to write and erase, and is harmful to bodies of teachers and students. Although the white board does not generate dust, like the blackboard, when handwriting needs to be erased, the corresponding handwriting can be erased by using a blackboard eraser type tool, and the blackboard eraser type tool can achieve the function of repeated writing but is time-consuming and labor-consuming in erasing.
The liquid crystal handwriting board which appears in recent years solves the limitation of the application in the fields, can be used as a family message book, a children drawing book or a copying book, and a teaching blackboard, is green and environment-friendly, can be repeatedly written, and can be immediately removed by one key.
Typically, polymer dispersed cholesteric liquid crystal materials exhibit Bragg reflection in response to pressure applied to one of the substrates. Bragg reflection refers to a texture that includes writing or drawing on an ewriter, which occurs when hard objects, such as a pen or fingernail, apply pressure on the surface of the ewriter, which changes the reflectivity of the cholesteric liquid crystal material compared to the background of the ewriter. The dispersion can be phase separated into an open cell cholesteric liquid crystal polymer structure, wherein the liquid crystal can flow when pressure is applied without disrupting the polymer structure.
The working principle of the handwriting board is as follows: the state of the cholesteric liquid crystal is changed into a plane state under the induction of pressure, the Bragg formula lambda is n P, and the highest reflection intensity is called as a bright state (a); after a special frequency and waveform electric field are applied, the cholesteric liquid crystal is converted from a plane state to a focal conic state (b), a Bragg formula is not satisfied, and incident light is scattered to achieve a dark state. After the first matrix layer is pressed, the cholesteric liquid crystal facing the pressed part is enabled to present a first stable state (a) plane texture, and lambda is reflected only when the optical rotation of incident light is consistent with that of the cholesteric liquid crystal layer and the wavelength meets the Bragg formula, wherein lambda is the wavelength of the incident light, n is the average refractive index of the liquid crystal, and P is the screw pitch of the liquid crystal material. The chiral dopant is specifically used for adjusting the rotating pitch of the cholesteric liquid crystal so as to control the wavelength of the reflected light wave of the cholesteric liquid crystal. Providing a cholesteric liquid crystal having a threshold voltage greater than that of the cholesteric liquid crystal and a field induced nematic phase voltage (Ec > E > Eth), the cholesteric liquid crystal exhibiting a second stable (b) focal conic texture, incident light being scattered without reflection, the state being maintained after removal of the voltage; when the voltage is larger than E > Ec, a field-induced nematic phase is generated, but this state is unstable after the voltage is removed. The reflected light is circularly polarized light, and the optical rotation is consistent with that of the cholesteric liquid crystal layer.
The relationship between the pitch P of the cholesteric liquid crystal material and the concentration C of the chiral agent is: p ═ 1/(HTP ×) where HTP is the twisting force constant of the chiral agent, the pitch and the reflection wavelength can be varied by adjusting the chiral agent for different HTP values and the content in the liquid crystal material.
The liquid crystal of the handwriting board needs cholesteric liquid crystal with small pitch, the liquid crystal is generally prepared by mixing nematic liquid crystal and chiral agent liquid crystal on the market at present, the traditional chiral agents are 811, CB15, CN and 1011, the HTP values of the chiral agents are small, and a large dose needs to be added when the mixture reaches the cholesteric liquid crystal with the target pitch (the principle is that P is 1/(HTP C), P is the pitch of the mixture, and C is the concentration of the chiral agent). The solubility of a large dose of chiral agent and nematic liquid crystal is quite easy to cause problems, and some chiral agents precipitate crystals at normal temperature, and the crystals are slightly low in temperature and extremely easy to deteriorate.
Chinese patent CN1623106A discloses an optical film in which coloration due to selective reflection is reduced, which is obtained by spreading a coating liquid containing a liquid crystal monomer, a chiral agent and a polymerization agent on an alignment substrate, aligning the monomer into a cholesteric structure by heat treatment, and polymerizing the liquid crystal monomer by subjecting the spread layer to polymerization treatment. Thereby forming an optical film having a selective reflection wavelength of 100nm to 320 nm.
Another chinese patent CN 1735820a discloses "broad band cholesteric liquid crystal film, manufacturing method, circularly polarizing plate, linearly polarizing mirror, lighting device and liquid crystal display device", the weakly alkaline polishing solution contains silica abrasive grains, hydrogen peroxide, sodium nitrate, sodium m-nitrobenzenesulfonate. Wherein, the hydrogen peroxide and the sodium m-nitrobenzenesulfonate are matched as oxidants, and the sodium nitrate is used as a corrosion inhibitor. The particle size of the silicon oxide abrasive particles is within the range of 30-50 nm. The pH value of the polishing solution is 7-9, ethylenediamine is used as a pH regulator, and meanwhile, the ethylenediamine has the function of a complexing agent. The polishing of the surface of the workpiece is finally realized through the interaction in chemical and mechanical polishing in a weak alkaline environment, no volatilization exists, and no corrosion damage is caused to equipment. Moreover, the workpiece is polished to reach higher surface planarization, and the ethylene diamine is used as a complexing agent to accelerate the dissolution of a copper oxide film, so that the higher surface planarization is kept, and meanwhile, the better polishing rate is kept. Meanwhile, the method also has the advantages of simple components, simplified process and low cost.
Further, Chinese patent No. CN 104871046A discloses a cholesteric liquid crystal laminate having at least 1 light reflection layer Xa obtained by immobilizing a cholesteric liquid crystal phase and having an HTP of 30 μm and at least 1 light reflection layer Xb, a method for producing the same, and a composition of the cholesteric liquid crystal laminate-1The light-reflecting layer Xb is a light-reflecting layer obtained by immobilizing a cholesteric liquid crystal phase and contains a chiral agent having a dextrorotation of 30 μm in HTP-1More levorotatory thanAnd a chiral agent, wherein the selective reflection wavelengths of all the light reflection layers Xa and Xb are in the range of 400nm to 750nm, the selective reflection wavelength of at least 1 of the light reflection layers Xa is equal to the selective reflection wavelength of at least 1 of the light reflection layers Xb, and all the adjacent light reflection layers in which the cholesteric liquid crystal phase is fixed are laminated in contact with each other, and a cholesteric liquid crystal layer having left and right reverse twist is laminated in contact with each other without using an adhesive.
Also, chinese patent CN 105062503a discloses "a liquid crystal material for inkjet and a method for preparing the same", which relates to a circularly polarized liquid crystal material with anti-counterfeit function, comprising polymerizable monomer or oligomer, chiral agent, initiator, auxiliary agent, solvent, conductive agent and optionally other additives. Wherein the polymerizable monomer or oligomer comprises at least three polymerizable monomers or oligomers (I), (II) and (III). The circular polarization liquid crystal material can be applied to a substrate to form a film product by one or more methods of ink jet printing, gravure printing, screen printing and coating.
Disclosure of Invention
The invention aims to provide a liquid crystal handwriting board film which can sense color handwriting under pressure, realize handwriting display and maintain the handwriting without power supply, and a preparation method thereof.
In order to achieve the technical purpose, the technical scheme is that the liquid crystal handwriting board film containing the chiral agent with the large HTP value is invented, and the liquid crystal handwriting board film comprises an upper substrate layer, a bottom substrate layer and cholesteric liquid crystal, wherein the cholesteric liquid crystal is clamped between the upper substrate layer and the bottom substrate layer; the cholesteric liquid crystal is prepared by uniformly mixing the following raw materials in parts by weight and then carrying out UV curing: 40-90 parts of liquid crystal microdroplets, 10-60 parts of adhesive and 0.1-0.3 part of spacer powder;
the adhesive also comprises an initiator accounting for 0.4-2% of the weight of the adhesive;
the liquid crystal microdroplet also contains 0.1-3% of a 5011 chiral agent with a large HTP value or an S5011 chiral agent or an R5011 chiral agent, 3-10% of an S811 chiral agent or an R811 chiral agent or a CB15 chiral agent, 10-25% of a CB 1011 chiral agent, and 2-10% of an S1011 chiral agent or an R1011 chiral agent;
the polarity of the large HTP value 5011 chiral agent or S5011 chiral agent or R5011 chiral agent, S811 chiral agent or R811 chiral agent or CB15 chiral agent, S1011 chiral agent or R1011 chiral agent is consistent;
the structural formula of the large HTP value chiral agent 5011 is as follows:
the particle size range of the liquid crystal droplets (acetylene liquid crystal mixture or biphenyl liquid crystal mixture) is 0.01-2 mu m. Acetylene liquid crystal mixture and biphenyl liquid crystal mixture
The spacer powder is PMMA or PS (polystyrene is a polymer synthesized by styrene monomer through free radical polycondensation), and the particle size of the spacer powder is 1-10 mu m.
The upper substrate layer is made of a polyester film PET, polyvinyl chloride PVC, polycarbonate PC or cellulose triacetate TAC, and the thickness of the upper substrate layer is 50-250 mu m; the outer surface is a fog-state film, and the inner surface is coated with an upper substrate conductive layer with sheet resistance of 50-800 omega/□.
Preferably, the thickness of the upper matrix layer is 125-200 μm.
Preferably, the thickness of the upper matrix layer is 125 μm.
The bottom substrate base layer is made of polyester film PET or polyvinyl chloride PVC or polycarbonate PC or triacetylcellulose TAC, is 50-250 μm thick, is a black bottom or a transparent layer, and is provided with a bottom substrate conducting layer with a sheet resistance of 50-800 omega/□ on the inner surface.
Preferably, the thickness of the bottom bulk base layer is 188 μm.
The upper substrate conducting layer and the bottom substrate conducting layer are made of one of Indium Tin Oxide (ITO), nano silver, graphene, polythiophene, polyacetylene, polyaniline and polypyrrole.
Meanwhile, a preparation method of the liquid crystal handwriting board film containing the chiral agent with the large HTP value is also provided, and the preparation process is as follows:
preparing materials: respectively weighing liquid crystal microdroplets, a 5011 chiral agent with a large HTP value, an S5011 chiral agent, an R5011 chiral agent, an S811 chiral agent, an R811 chiral agent, a CB15 chiral agent, an S1011 chiral agent, an R1011 chiral agent, an adhesive, spacer powder and an initiator according to the weight ratio, and taking an upper matrix layer and a bottom matrix layer for later use;
the preparation method comprises the following steps: mixing liquid crystal microdroplets, a 5011 chiral agent with a large HTP value, an S5011 chiral agent, an R5011 chiral agent, an S811 chiral agent, an R811 chiral agent, a CB15 chiral agent, an S1011 chiral agent or an R1011 chiral agent at 80 ℃, stirring for 2 hours, sequentially adding spacing powder, an adhesive and an initiator, and uniformly mixing to obtain a cholesteric liquid crystal mixture for later use;
thirdly, coating: coating the cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer by a wet compounding machine, and enabling an upper substrate conducting layer and a bottom substrate conducting layer to be arranged on one side close to the cholesteric liquid crystal mixture to form a coating plate film with the thickness of 1-10 mu m for later use;
fourthly, curing: curing the coating plate film at the curing light intensity of 10-25 mW/cm2And irradiating for 5-15 min under UV light to obtain the liquid crystal handwriting board film containing the chiral agent with the large HTP value.
The weight units used above may be in grams, kilograms or tons, or other weight units.
The liquid crystal handwriting board film containing the chiral agent with the large HTP value has the following principle: when the cholesteric liquid crystal is induced by pressure, the state is changed into a plane, at the moment, the cholesteric liquid crystal presents a first stable (a) plane texture, the optical rotation of incident light is consistent with that of the cholesteric liquid crystal layer, the wavelength meets the Bragg formula, and lambda is reflected as nP because of the color of the displayed note. Wherein λ is the wavelength of the incident light, n is the average refractive index of the liquid crystal, and P is the pitch of the liquid crystal material. The chiral dopant is specifically used for adjusting the rotating pitch of the cholesteric liquid crystal, so that the wavelength of light waves reflected by the cholesteric liquid crystal is controlled; when a voltage greater than the threshold voltage of the cholesteric liquid crystal and less than the field-induced nematic phase voltage (Ec > E > Eth) is applied, the cholesteric liquid crystal will assume a second stable (b) focal conic texture, the incident light is scattered without reflection, this state is maintained even after the voltage is removed, and the writing is erased. Further, when the voltage is larger E > Ec, a field-induced nematic phase is generated, but this state is unstable after the voltage is removed. As the chiral agent 5011 with large HTP, the homologues and the derivatives (the HTP value of the chiral agent 5011, the homologues and the derivatives is about 10 times that of the chiral agent 811 and about 100 times that of the chiral agent CB 15) are introduced, the content of the chiral agent can be greatly reduced under the condition of reaching the same pitch, thereby solving the problem of the solubility of the chiral agent and nematic liquid crystal and reducing the manufacturing cost of a liquid crystal layer.
Detailed Description
The present invention will be further described with reference to the following examples. The following description is given by way of example, and the scope of the invention should not be limited thereto.
Example 1:
firstly, 1 black film (bottom substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and bottom substrate conducting layer) and 1 fog-state film (upper substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and upper substrate conducting layer) with the inner surface of 25cm multiplied by 20cm are taken, the haze is 15%, the transmittance is 85%, and the sheet resistance is 600 omega/□ for standby;
then respectively weighing 0.5 g of alkyne liquid crystal mixture, 0.0055 g of S5011 chiral agent, 0.025 g of S811 chiral agent and 0.03 g of S1011 chiral agent, mixing and stirring for 2 hours at 80 ℃, adding 0.0015 g of spacer powder (produced by Suzhou Nami micro technology Co., Ltd.) with the diameter of 5 mu m, then adding 0.2 g of acrylate adhesive, and stirring uniformly to obtain a cholesteric liquid crystal mixture;
and coating the prepared cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compounding machine, wherein: the upper substrate conducting layer (indium tin oxide) and the bottom substrate conducting layer (indium tin oxide) are arranged on one side close to the cholesteric liquid crystal mixture to form coating plate films;
thereafter, the coated sheet film was coated at 21mW/cm2The Philips ultraviolet high-pressure mercury lamp (the wavelength is 365nm) is irradiated for 10min, and the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the thin handwriting is obtained.
And finally, cutting the liquid crystal handwriting board containing the chiral agent with the large HTP value of the thin handwriting into a corresponding size according to the requirements of customers, and matching the corresponding PCB with the shell to manufacture the liquid crystal handwriting board containing the chiral agent with the large HTP value of the thin handwriting.
The liquid crystal handwriting board containing the chiral agent with the high HTP value of the fine handwriting can be used as a tool for children to draw and practice calligraphy.
Example 2:
firstly, 1 black film (bottom substrate layer, PET) with the inner surface coated with nano silver (bottom substrate conducting layer) and 25cm × 20cm and 1 fog-state film (upper substrate layer, PET) with the inner surface coated with nano silver (upper substrate conducting layer) are taken, the haze is 20%, the transmittance is 83%, and the sheet resistance is 100 omega/□ for later use;
then respectively weighing 0.5 g of biphenyl liquid crystal mixture, 0.006 g of R5011 chiral agent, 0.04 g of R811 chiral agent and 0.02 g of R1011 chiral agent, mixing and stirring at 80 ℃ for 2h, adding 0.001 g of spacer powder (produced by Suzhou nano micro-technology Limited) with the diameter of 4 mu m, adding 0.125 g of acrylate adhesive, and uniformly stirring to obtain a cholesteric liquid crystal mixture;
and coating the prepared cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compounding machine, wherein: the upper substrate conducting layer (nano silver) and the bottom substrate conducting layer (nano silver) are arranged on one side close to the cholesteric liquid crystal mixture to form coating plate films;
thereafter, the coated sheet film was coated at 21mW/cm2And (3) irradiating the thick handwriting for 10min by using a Philips ultraviolet high-pressure mercury lamp (the wavelength is 365nm) to obtain the liquid crystal handwriting board film containing the chiral agent with the large HTP value.
And finally, cutting the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the coarse handwriting into corresponding sizes according to the requirements of customers, and matching the corresponding PCB with the shell to manufacture the liquid crystal handwriting board containing the chiral agent with the large HTP value of the coarse handwriting.
The liquid crystal handwriting board containing the chiral agent with the large HTP value of the coarse handwriting can be used as a teaching blackboard or a message board.
Example 3:
firstly, 1 black film (bottom substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and bottom substrate conducting layer) and 1 fog-state film (upper substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and upper substrate conducting layer) with the inner surface of 25cm multiplied by 20cm are taken, the haze is 15%, the transmittance is 85%, and the sheet resistance is 600 omega/□ for standby;
then respectively weighing 0.5 g of biphenyl liquid crystal mixture, 0.006 g of R5011 chiral agent, 0.1 g of CB15 chiral agent and 0.002 g of R1011 chiral agent, mixing and stirring for 2 hours at 80 ℃, adding 0.001 g of spacer powder (produced by Suzhou nano micro-technology Limited) with the diameter of 4 mu m, adding 0.125 g of acrylate adhesive, and uniformly stirring to obtain a cholesteric liquid crystal mixture;
and coating the prepared cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compounding machine, wherein: the upper substrate conducting layer (indium tin oxide) and the bottom substrate conducting layer (indium tin oxide) are arranged on one side close to the cholesteric liquid crystal mixture to form coating plate films;
thereafter, the coated sheet film was coated at 21mW/cm2And (3) irradiating the thick handwriting for 10min by using a Philips ultraviolet high-pressure mercury lamp (the wavelength is 365nm) to obtain the liquid crystal handwriting board film containing the chiral agent with the large HTP value.
And finally, cutting the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the coarse handwriting into corresponding sizes according to the requirements of customers, and matching the corresponding PCB with the shell to manufacture the liquid crystal handwriting board containing the chiral agent with the large HTP value of the coarse handwriting.
The liquid crystal handwriting board containing the chiral agent with the large HTP value of the coarse handwriting can be used as a teaching blackboard or a message board.
Example 4:
firstly, 1 black film (bottom substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and bottom substrate conducting layer) and 1 fog-state film (upper substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and upper substrate conducting layer) with the inner surface of 25cm multiplied by 20cm are taken, the haze is 25%, the transmittance is 85%, and the sheet resistance is 230 omega/□ for standby;
respectively weighing 0.5 g of acetylene liquid crystal mixture, 0.0055 g of R5011 chiral agent, 0.075 g of CB15 chiral agent and 0.03 g of R1011 chiral agent, mixing and stirring at 80 ℃ for 2h, adding 0.001 g of spacer powder (produced by Suzhou NaSCHI Co., Ltd.) with the diameter of 4 mu m, adding 0.075 g of acrylate adhesive, and uniformly stirring to obtain a cholesteric liquid crystal mixture;
and coating the prepared cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compounding machine, wherein: the upper substrate conducting layer (indium tin oxide) and the bottom substrate conducting layer (indium tin oxide) are arranged on one side close to the cholesteric liquid crystal mixture to form coating plate films;
thereafter, the coated sheet film was coated at 21mW/cm2The Philips ultraviolet high-pressure mercury lamp (the wavelength is 365nm) is irradiated for 10min, and the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the thin handwriting is obtained.
And finally, cutting the liquid crystal handwriting board containing the chiral agent with the large HTP value of the thin handwriting into a corresponding size according to the requirements of customers, and matching the corresponding PCB with the shell to manufacture the liquid crystal handwriting board containing the chiral agent with the large HTP value of the thin handwriting.
The liquid crystal handwriting board containing the chiral agent with the high HTP value of the fine handwriting can be used as a tool for children to draw and practice calligraphy.
Example 5:
firstly, 1 transparent film (bottom substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and bottom substrate conducting layer) of 25cm multiplied by 20cm and 1 fog-state film (upper substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and upper substrate conducting layer) of 25cm multiplied by 20cm are taken for standby, the haze is 25 percent, the transmittance is 85 percent, and the sheet resistance is 230 omega/□;
then respectively weighing 0.5 g of acetylene liquid crystal mixture, 0.0055 g of R5011 chiral agent, 0.075 g of CB15 chiral agent and 0.03 g of R1011 chiral agent, mixing and stirring for 2h at 80 ℃, adding 0.0015 g of spacer powder (produced by Suzhou nano micro-technology limited) with the diameter of 7 mu m, adding 0.08 g of acrylate adhesive, and uniformly stirring to obtain a cholesteric liquid crystal mixture;
and coating the prepared cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compounding machine, wherein: the upper substrate conducting layer (indium tin oxide) and the bottom substrate conducting layer (indium tin oxide) are arranged on one side close to the cholesteric liquid crystal mixture to form coating plate films;
thereafter, the coated sheet film was coated at 21mW/cm2The Philips ultraviolet high-pressure mercury lamp (the wavelength is 365nm) is irradiated for 10min, and the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the thin handwriting is obtained.
Finally, cutting the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the thin handwriting into corresponding sizes according to the requirements of customers, bonding the transparent film substrate layer surface (namely, the outer bottom surface of the bottom substrate layer) to the acrylic transparent board, and matching the corresponding PCB board with the shell to obtain the liquid crystal handwriting board containing the chiral agent with the large HTP value of the thin handwriting.
The liquid crystal writing board containing the chiral agent with the large HTP value of the fine handwriting can be used as a drawing and calligraphy-practicing tool for children.
Example 6:
firstly, 1 transparent film (bottom substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and bottom substrate conducting layer) of 25cm multiplied by 20cm and 1 fog-state film (upper substrate layer, PET) with the inner surface coated with ITO (indium tin oxide and upper substrate conducting layer) of 25cm multiplied by 20cm are taken for standby, the haze is 15%, the transmittance is 85%, and the sheet resistance is 600 omega/□;
then respectively weighing 0.5 g of biphenyl liquid crystal mixture, 0.006 g of R5011 chiral agent, 0.1 g of CB15 chiral agent and 0.02 g of R1011 chiral agent, mixing and stirring for 2 hours at 80 ℃, adding 0.0015 g of spacer powder (produced by Suzhou Nami micro technology Co., Ltd.) with the diameter of 4 mu m, adding 0.125 g of acrylate adhesive, and uniformly stirring to obtain a cholesteric liquid crystal mixture;
and coating the prepared cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compounding machine, wherein: the upper substrate conducting layer (indium tin oxide) and the bottom substrate conducting layer (indium tin oxide) are arranged on one side close to the cholesteric liquid crystal mixture to form coating plate films;
thereafter, the coated sheet film was coated at 21mW/cm2Philips ultraviolet high pressureIrradiating for 10min under the condition of mercury lamp (wavelength is 365nm) to obtain the liquid crystal handwriting board film containing the chiral agent with large HTP value of the coarse handwriting.
And finally, cutting the liquid crystal handwriting board film containing the chiral agent with the large HTP value of the coarse handwriting into a corresponding size according to the requirements of customers, bonding the transparent film substrate layer (namely, the outer bottom surface of the bottom substrate layer) to the acrylic transparent board, and matching the corresponding PCB with the shell to obtain the liquid crystal handwriting board containing the chiral agent with the large HTP value of the coarse handwriting.
The liquid crystal handwriting board containing the chiral agent with the large HTP value of the coarse handwriting can be used as a tool for the perspective tracing of the coarse handwriting.
The liquid crystal handwriting board manufactured by the liquid crystal handwriting board film containing the chiral agent with the high HTP value can be used as tools such as children drawing boards, family message boards, teaching aids and the like.
Claims (5)
1. A liquid crystal handwriting pad film containing a chiral agent with a large HTP value comprises an upper substrate layer, a bottom substrate layer and cholesteric liquid crystal, wherein the cholesteric liquid crystal is clamped between the upper substrate layer and the bottom substrate layer; the cholesteric liquid crystal is characterized by being prepared by uniformly mixing the following raw materials in parts by weight and then carrying out UV curing: 40-90 parts of liquid crystal microdroplets, 10-60 parts of adhesive and 0.1-0.3 part of spacer powder;
the liquid crystal microdroplets are acetylene liquid crystal mixtures, and the particle size range of the liquid crystal microdroplets is 0.01-2 mu m;
the adhesive also comprises an initiator accounting for 0.4-2% of the weight of the adhesive;
the liquid crystal microdroplet also contains 0.7218-0.8011% of a 5011 chiral agent with a large HTP value or an S5011 chiral agent or an R5011 chiral agent, 3.9370-4.3700% of an S811 chiral agent or an R811 chiral agent or a CB15 chiral agent, and 3.2808-10.9250% of an S1011 chiral agent or an R1011 chiral agent;
the polarity of the large HTP value 5011 chiral agent or S5011 chiral agent or R5011 chiral agent, S811 chiral agent or R811 chiral agent or CB15 chiral agent, S1011 chiral agent or R1011 chiral agent is consistent;
the structural formula of the large HTP value chiral agent 5011 is as follows:
the preparation process comprises the following steps:
preparing materials: respectively weighing liquid crystal microdroplets, a 5011 chiral agent with a large HTP value, an S5011 chiral agent, an R5011 chiral agent, an S811 chiral agent, an R811 chiral agent, a CB15 chiral agent, an S1011 chiral agent, an R1011 chiral agent, an adhesive, spacer powder and an initiator according to the weight ratio, and taking an upper matrix layer and a bottom matrix layer for later use;
the preparation method comprises the following steps: mixing liquid crystal microdroplets, a 5011 chiral agent with a large HTP value, an S5011 chiral agent, an R5011 chiral agent, an S811 chiral agent, an R811 chiral agent, a CB15 chiral agent, an S1011 chiral agent or an R1011 chiral agent at 80 ℃, stirring for 2 hours, sequentially adding spacing powder, an adhesive and an initiator, and uniformly mixing to obtain a cholesteric liquid crystal mixture for later use;
thirdly, coating: coating the cholesteric liquid crystal mixture between an upper substrate layer and a bottom substrate layer through a wet compound machine, and enabling an upper substrate conducting layer and a bottom substrate conducting layer to be arranged on one side close to the cholesteric liquid crystal mixture to form a coating plate film for later use;
fourthly, curing: curing the coating plate film at the curing light intensity of 10-25 mW/cm2And irradiating for 5-15 min under UV light to obtain the liquid crystal handwriting board film containing the chiral agent with the large HTP value.
2. The liquid crystal writing panel film containing a high HTP value chiral agent of claim 1, wherein: the spacer powder is PMMA or PS, and the particle size of the spacer powder is 1-10 mu m.
3. The liquid crystal writing panel film containing a high HTP value chiral agent of claim 2, wherein: the upper substrate layer is made of a polyester film PET, polyvinyl chloride PVC, polycarbonate PC or cellulose triacetate TAC, and the thickness of the upper substrate layer is 50-250 mu m; the outer surface is a fog-state film, and the inner surface is coated with an upper substrate conductive layer with sheet resistance of 50-800 omega/□.
4. The liquid crystal writing panel film containing a high HTP value chiral agent of claim 3, wherein: the bottom substrate layer is made of polyester film PET or polyvinyl chloride PVC or polycarbonate PC or triacetylcellulose TAC, is 50-250 μm thick, is a black bottom or transparent layer, and has a bottom substrate conducting layer with a sheet resistance of 50-800 Ω/□ laid on the inner surface.
5. The liquid crystal writing panel film containing a high HTP value chiral agent of claim 4, wherein: the upper substrate conducting layer and the bottom substrate conducting layer are made of one of Indium Tin Oxide (ITO), nano silver, graphene, polythiophene, polyacetylene, polyaniline and polypyrrole.
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| CN111308821A (en) * | 2020-04-10 | 2020-06-19 | 合肥工业大学 | Liquid crystal sensing device and preparation method thereof |
| CN111574739B (en) * | 2020-05-26 | 2021-02-26 | 深圳市宝立创科技有限公司 | Modified spacer powder, preparation method thereof and liquid crystal handwriting board |
| CN112230808A (en) * | 2020-10-20 | 2021-01-15 | 深圳市宝立创科技有限公司 | Electromagnetic screen liquid crystal handwriting board and preparation method thereof |
| CN113534555A (en) * | 2021-07-20 | 2021-10-22 | Tcl华星光电技术有限公司 | Display panel, preparation method thereof and three-dimensional display device |
| CN115851087B (en) * | 2022-12-29 | 2023-10-10 | 广东粤港澳大湾区黄埔材料研究院 | Blue light diffusion prevention coating and application thereof |
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