CN111176029A - Liquid crystal handwriting diaphragm, preparation method thereof and liquid crystal handwriting board - Google Patents
Liquid crystal handwriting diaphragm, preparation method thereof and liquid crystal handwriting board Download PDFInfo
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- CN111176029A CN111176029A CN202010186663.2A CN202010186663A CN111176029A CN 111176029 A CN111176029 A CN 111176029A CN 202010186663 A CN202010186663 A CN 202010186663A CN 111176029 A CN111176029 A CN 111176029A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 132
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229920000642 polymer Polymers 0.000 claims abstract description 108
- 239000000758 substrate Substances 0.000 claims abstract description 105
- 125000006850 spacer group Chemical group 0.000 claims abstract description 45
- 239000002861 polymer material Substances 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 205
- 238000000016 photochemical curing Methods 0.000 claims description 92
- 238000000576 coating method Methods 0.000 claims description 64
- 239000011248 coating agent Substances 0.000 claims description 63
- 239000007788 liquid Substances 0.000 claims description 17
- 238000001723 curing Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000007765 extrusion coating Methods 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 229920001721 polyimide Polymers 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 238000002834 transmittance Methods 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 2
- 230000007488 abnormal function Effects 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 11
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920000058 polyacrylate Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000001132 aluminium potassium sulphate Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- PSGCQDPCAWOCSH-UHFFFAOYSA-N (4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl) prop-2-enoate Chemical compound C1CC2(C)C(OC(=O)C=C)CC1C2(C)C PSGCQDPCAWOCSH-UHFFFAOYSA-N 0.000 description 1
- XWQPYRZLNKQZFP-UHFFFAOYSA-N 11-methyldodecyl 2-methylprop-2-enoate Chemical compound CC(C)CCCCCCCCCCOC(=O)C(C)=C XWQPYRZLNKQZFP-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- YIJYFLXQHDOQGW-UHFFFAOYSA-N 2-[2,4,6-trioxo-3,5-bis(2-prop-2-enoyloxyethyl)-1,3,5-triazinan-1-yl]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCN1C(=O)N(CCOC(=O)C=C)C(=O)N(CCOC(=O)C=C)C1=O YIJYFLXQHDOQGW-UHFFFAOYSA-N 0.000 description 1
- HFCUBKYHMMPGBY-UHFFFAOYSA-N 2-methoxyethyl prop-2-enoate Chemical compound COCCOC(=O)C=C HFCUBKYHMMPGBY-UHFFFAOYSA-N 0.000 description 1
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical class C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N acetone Substances CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- YMCOIFVFCYKISC-UHFFFAOYSA-N ethoxy-[2-(2,4,6-trimethylbenzoyl)phenyl]phosphinic acid Chemical compound CCOP(O)(=O)c1ccccc1C(=O)c1c(C)cc(C)cc1C YMCOIFVFCYKISC-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 125000004573 morpholin-4-yl group Chemical group N1(CCOCC1)* 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- JRWNODXPDGNUPO-UHFFFAOYSA-N oxolane;prop-2-enoic acid Chemical compound C1CCOC1.OC(=O)C=C JRWNODXPDGNUPO-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920005650 polypropylene glycol diacrylate Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
-
- 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
-
- 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
Abstract
The invention relates to the technical field of liquid crystal handwriting boards, in particular to a liquid crystal handwriting diaphragm, a preparation method thereof and a liquid crystal handwriting board. The invention provides a liquid crystal handwriting diaphragm, which comprises a first substrate, a first conducting layer, a polymer layer, a liquid crystal layer, a second conducting layer and a second substrate which are sequentially stacked; or comprises a first substrate, a first conducting layer, a liquid crystal layer, a polymer layer, a second conducting layer and a second substrate which are arranged in sequence; the polymer layer includes a polymer material layer and spacers uniformly fixed in the polymer material layer. The polymer layer uniformly fixes the spacers on the conductive layer, so that the spacers are guaranteed to play a supporting role, and the problem of abnormal functions of the handwriting board caused by uneven dispersion of the spacers in the handwriting diaphragm due to movement of the spacers caused by writing, cold and hot shrinkage and other reasons is avoided.
Description
Technical Field
The invention relates to the technical field of liquid crystal handwriting boards, in particular to a liquid crystal handwriting diaphragm, a preparation method thereof and a liquid crystal handwriting board.
Background
At present, in the production and preparation process of the existing liquid crystal handwriting board, cholesteric liquid crystal, a spacer and a prepolymer material are generally mixed uniformly and then are sandwiched between two plastic substrates with conductive materials in a coating mode. Due to the cold and hot shrinkage of the plastic substrates, the spacers can flow due to the temporary deformation of the upper and lower plastic substrates. After the deformation is recovered, the spacers cannot return to the original positions, so that the spacers are not arranged at the positions, and the thickness and the uniformity of the liquid crystal layer are influenced; or for a large-size liquid crystal handwriting board, most of the handwriting boards are hung on a wall, and the liquid crystal gravity can flow downwards to cause the spacers to be agglomerated, so that the thickness and uniformity of the liquid crystal layer are also affected, and finally, the writing performance of the liquid crystal handwriting board is abnormal.
Disclosure of Invention
The invention aims to provide a liquid crystal handwriting diaphragm, a preparation method thereof and a liquid crystal handwriting board.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a liquid crystal handwriting diaphragm, which comprises a first substrate, a first conducting layer, a polymer layer, a liquid crystal layer, a second conducting layer and a second substrate which are sequentially stacked;
or comprises a first substrate, a first conducting layer, a liquid crystal layer, a polymer layer, a second conducting layer and a second substrate which are arranged in sequence;
the polymer layer includes a polymer material layer and spacers uniformly fixed in the polymer material layer.
Preferably, the second substrate has a transmittance of 0% to 90%;
the transmittance of the first substrate is 20% -95%.
Preferably, the thickness of the polymer material layer is less than or equal to 5 mu m;
the polymer in the polymer material layer is one or more of acrylic polyester polymer, polyurethane polymer, polyimide polymer and polyvinyl alcohol polymer.
Preferably, the granularity of the spacer is 2-10 μm.
Preferably, the area ratio of the spacer to the polymer layer is (0.001-1): 1.
preferably, the preparation method of the polymer layer comprises the following steps:
mixing the spacer and the polymer solution to obtain a coating liquid;
and coating the coating liquid on the surface of the first conductive layer or the second conductive layer to obtain a polymer layer.
Preferably, the coating mode is micro-concave coating or slit coating;
the coating speed is 1-50 m/min;
the curing temperature is 80-200 ℃, and the curing time is 0.5-20 min.
The invention also provides a preparation method of the liquid crystal handwriting diaphragm, which comprises the following steps:
preparing a first conductive layer on one surface of a first substrate to obtain the first substrate with the first conductive layer;
preparing a second conductive layer on one surface of the second substrate to obtain a second substrate with the second conductive layer;
coating a polymer layer on the first substrate with the first conductive layer or the second substrate with the second conductive layer to obtain a first substrate with the polymer layer and the first conductive layer;
and coating liquid crystal slurry between the first substrate with the polymer layer and the first conducting layer and the second substrate with the second conducting layer in an extrusion coating mode, and carrying out photocuring to obtain the liquid crystal handwriting film.
Preferably, the coating speed of coating the liquid crystal slurry between the first substrate with the polymer layer and the first conductive layer and the second substrate with the second conductive layer is 0.1-5 m/min;
the photocuring is one-step photocuring or step-by-step photocuring;
the light is generated when the coating liquid is applied to the first conductive layerThe curing is one-step photocuring or step-by-step photocuring, and the light intensity of the one-step photocuring is 5-15 mW/cm2The one-step photocuring time is 1-20 min;
the step photocuring comprises a first step photocuring and a second step photocuring;
the light intensity of the first step of photocuring is 0.1-5 mW/cm2The first step of photocuring lasts for 0.5-6 min;
the light intensity of the second step of photocuring is 5-15 mW/cm2The first step of photocuring lasts for 1-10 min;
when the coating liquid is coated on the second conductive layer, the photocuring is step photocuring;
the step photocuring comprises a first step photocuring and a second step photocuring;
the light intensity of the first step of photocuring is 0.1-5 mW/cm2The first step of photocuring lasts for 0.5-6 min;
the light intensity of the second step of photocuring is 5-15 mW/cm2And the first step of photocuring lasts for 1-10 min.
The invention also provides a liquid crystal handwriting pad which comprises an upper shell, a liquid crystal membrane, a circuit board, a battery and a lower shell which are arranged in sequence, wherein the liquid crystal membrane is the liquid crystal handwriting membrane or the liquid crystal handwriting membrane prepared by the preparation method of the technical scheme.
The invention provides a liquid crystal handwriting diaphragm, which comprises a first substrate, a first conducting layer, a polymer layer, a liquid crystal layer, a second conducting layer and a second substrate which are sequentially stacked; or comprises a first substrate, a first conducting layer, a liquid crystal layer, a polymer layer, a second conducting layer and a second substrate which are arranged in sequence; the polymer layer includes a polymer material layer and spacers uniformly fixed in the polymer material layer. The spacers are uniformly fixed on the conductive layer through the conductive material layer, so that the spacers are guaranteed to play a supporting role, and the problem that the spacers are not uniformly dispersed in the liquid crystal handwriting diaphragm under the influence of the outside is avoided.
Detailed Description
The invention provides a liquid crystal handwriting diaphragm, which comprises a first substrate, a first conducting layer, a polymer layer, a liquid crystal layer, a second conducting layer and a second substrate which are sequentially stacked;
or comprises a first substrate, a first conducting layer, a liquid crystal layer, a polymer layer, a second conducting layer and a second substrate which are arranged in sequence;
the polymer layer includes a polymer material layer and spacers uniformly fixed in the polymer material layer.
In the invention, the liquid crystal handwriting diaphragm comprises a first substrate and a second substrate; the material of the first substrate and the second substrate is independently Polycarbonate (PC) or polyethylene terephthalate (PET). In the present invention, the transmittance of the first substrate is preferably 20% to 95%, more preferably 50% to 95%, and most preferably 80% to 90%; in an embodiment of the invention, the first substrate is a 125-AGCL-KSANY-500 transparent film ITO substrate manufactured by Kangsheng optical technology Co. In the present invention, the transmittance of the second substrate is preferably 0% to 95%, more preferably 0% to 60%, and most preferably 0% to 45%. In the invention, the thicknesses of the first substrate and the second substrate are independently preferably 50-500 μm, and more preferably 100-200 μm; in a specific implementation of the invention, the second substrate is specifically a black ITO substrate with model number LWH 188-a.
In the invention, the liquid crystal handwriting diaphragm further comprises a first conducting layer and a second conducting layer;
in the present invention, the material of the first conductive layer and the second conductive layer is not limited in any way, and materials known to those skilled in the art may be used.
In the invention, the liquid crystal handwriting film further comprises a polymer layer. The polymer layer is disposed between the first conductive layer and the liquid crystal layer or between the liquid crystal layer and the second conductive layer. In the present invention, the polymer layer includes a polymer material layer and spacers uniformly fixed in the polymer material layer. In the invention, the polymer in the polymer material layer is one or more of acrylic polyester polymer, polyurethane polymer, polyimide polymer and polyvinyl alcohol polymer; the specific types of the acrylic polyester-based polymer, the polyurethane-based polymer, the polyimide-based polymer and the polyvinyl alcohol-based polymer are not particularly limited, and those known to those skilled in the art may be used. When the polymer is two or more of the above specific choices, the present invention does not have any particular limitation on the ratio of the specific substances. In a particular embodiment of the invention, the polymer is in particular polyvinyl alcohol, polyurethane or polyimide. In the present invention, the type of the spacer is preferably a plastic spacer or a glass spacer. In the present invention, the thickness of the layer of polymer material is preferably ≦ 5 μm; the particle size of the spacer is preferably 2 to 10 μm, more preferably 3 to 8 μm, and most preferably 5 to 6 μm.
In the present invention, the method for preparing the polymer layer preferably includes the steps of:
mixing the spacer and the polymer solution to obtain a coating liquid;
and coating the coating liquid on the surface of the first conductive layer or the second conductive layer to obtain a polymer layer.
Mixing a spacer and a polymer solution to obtain a coating liquid; the mass concentration of the polymer solution is preferably 1% o to 50%, more preferably 5% o to 30%, and most preferably 1% to 10%.
The mixing is not particularly limited in the present invention, and may be carried out by a mixing process known to those skilled in the art.
After obtaining the coating liquid, coating the coating liquid on the surface of the first conductive layer to obtain a polymer layer; in the present invention, the coating is preferably a dimple coating or a slit coating; the coating speed is preferably 3-20 m/min, more preferably 5-20 m/min, and most preferably 15-20 m/min. In the present invention, after the coating is completed, the thickness of the obtained wet film is preferably 5 to 20 μm, more preferably 8 to 18 μm, and most preferably 10 to 15 μm. In the invention, the curing temperature is preferably 100-150 ℃, more preferably 110-140 ℃, and most preferably 120-130 ℃; the curing time is preferably 1-5 min, more preferably 2-4 min, and most preferably 2.5-3.5 min.
In the present invention, the area ratio of the spacer to the polymer layer is preferably (0.001 to 1): 1, more preferably (0.005-0.8): 1, most preferably (0.002-0.006): 1.
in the invention, the liquid crystal handwriting diaphragm further comprises a liquid crystal layer; in the present invention, the liquid crystal layer is preferably a polymer + liquid crystal layer, or the liquid crystal layer is preferably a polymer layer and a polymer + liquid crystal layer.
In the present invention, when the liquid crystal layer is a polymer + liquid crystal layer, the polymer is preferably one or more of an acrylic polymer, an acrylate polymer, and an elemental organic polymer. The specific type of the acrylic polymer, the acrylic polymer or the elemental organic polymer is not particularly limited in the present invention, and those known to those skilled in the art may be used. In the present invention, the type of the liquid crystal is preferably cholesteric liquid crystal. In the invention, the mass ratio of the polymer to the liquid crystal in the liquid crystal layer is preferably (1-3): 10.
in the present invention, when the liquid crystal layer is a polymer layer and a polymer + liquid crystal layer, the kind of the polymer in the polymer layer is the same as that in the polymer + liquid crystal layer; the types of the polymer and the liquid crystal are the same as those of the polymer and the liquid crystal when the liquid crystal layer is a polymer + liquid crystal layer, and are not described herein again.
In the invention, the thickness of the liquid crystal layer is preferably 1-10 μm, more preferably 1-5 μm, and most preferably 2-4 μm.
The invention also provides a preparation method of the liquid crystal handwriting diaphragm, which comprises the following steps:
preparing a first conductive layer on one surface of a first substrate to obtain the first substrate with the first conductive layer;
preparing a second conductive layer on one surface of the second substrate to obtain a second substrate with the second conductive layer;
coating a polymer layer on the first substrate with the first conductive layer to obtain a first substrate with the polymer layer and the first conductive layer;
and coating liquid crystal slurry between the first substrate with the polymer layer and the first conducting layer and the second substrate with the second conducting layer in an extrusion coating mode, and carrying out photocuring to obtain the liquid crystal handwriting film.
Preparing a first conductive layer on one surface of a first substrate to obtain the first substrate with the first conductive layer; and preparing a second conductive layer on one surface of the second substrate to obtain the second substrate with the second conductive layer. The preparation process is not limited in any way, and the sputtering can be carried out by adopting the preparation process known to the skilled person.
After a first substrate with a first conductive layer is obtained, coating a polymer layer on the first substrate with the first conductive layer to obtain the first substrate with the polymer layer and the first conductive layer; in the present invention, the process of coating the polymer layer preferably refers to the above-mentioned process of preparing the polymer layer, and is not described herein again.
After the first substrate with the polymer layer and the first conducting layer and the second substrate with the second conducting layer are obtained, liquid crystal slurry is coated between the first substrate with the polymer layer and the first conducting layer and the second substrate with the second conducting layer in an extrusion coating mode and is subjected to photocuring, and the liquid crystal handwriting diaphragm is obtained. In the present invention, the liquid crystal paste preferably includes a prepolymer, a liquid crystal, and an initiator; the mass ratio of the prepolymer to the liquid crystal to the initiator is preferably (5-50): (50-95): (0.1-4), more preferably (10-40): (60-90): (0.5 to 3.5), most preferably (20 to 30): (70-80): (1.5-2.5). In the present invention, the type of the prepolymer is preferably a prepolymer monomer well known to those skilled in the art to be able to obtain the above-mentioned polymer types; the kind of the liquid crystal is preferably cholesteric liquid crystal; the photoinitiator is preferably an acyl phosphate oxide photoinitiator; the present invention does not specifically limit the kind of the acylphosphine oxide photoinitiator, and any kind of photoinitiator known to those skilled in the art may be used. In the present invention, the coating speed is preferably 0.1 to 5m/min, more preferably 0.1 to 0.5m/min, and most preferably 0.4 m/min. The thickness of the wet film obtained after coating is preferably 10 to 30 μm, and more preferably 15 μm.
In the present invention, the photo-curing is preferably one-step photo-curing or step photo-curing; the light curing light is preferably UV light; when the photocuring is one-step photocuring, the light intensity of the one-step photocuring is preferably 5-15 mW/cm2More preferably 8-12 mW/cm2Most preferably 9-11 mW/cm2(ii) a The one-step photocuring time is preferably 1-20 min, more preferably 5-15 min, and most preferably 8-12 min; in the invention, the liquid crystal layer prepared by the one-step photocuring is a polymer + liquid crystal layer.
In the present invention, when the photocuring is step photocuring, the step photocuring preferably includes a first step photocuring and a second step photocuring; the light intensity of the first step of photocuring is preferably 0.1-5 mW/cm2More preferably 0.5 to 4.0mW/cm2Most preferably 1.5 to 3.0mW/cm2(ii) a The first-step photocuring time is preferably 0.5-6 min, more preferably 1-5 min, and most preferably 2-4 min. In the invention, the light intensity of the second step of photocuring is preferably 5-15 mW/cm2More preferably 8-12 mW/cm2Most preferably 9-11 mW/cm2(ii) a The second step of photo-curing is preferably performed for 1-10 min, more preferably for 2-8 min, and most preferably for 4-6 min. In the present invention, the first photo-curing forms a polymer layer on the surface layer of the liquid crystal layer to enhance adhesion, and the second photo-curing functions to deeply cure the prepolymer. In the invention, the liquid crystal layer prepared by the step-by-step photocuring is a polymer layer and a polymer + liquid crystal layer.
Or after a second substrate with a second conductive layer is obtained, coating a polymer layer on the second substrate with the second conductive layer to obtain the second substrate with the polymer layer and the second conductive layer; in the present invention, the process of coating the polymer layer preferably refers to the above-mentioned process of preparing the polymer layer, and is not described herein again.
After the second substrate with the polymer layer and the second conducting layer and the first substrate with the first conducting layer are obtained, liquid crystal slurry is coated between the second substrate with the polymer layer and the second conducting layer and the first substrate with the first conducting layer in an extrusion coating mode and is subjected to photocuring, and the liquid crystal handwriting diaphragm is obtained. The extrusion coating process is not limited in any way, and the extrusion coating process can be referred to, and is not repeated herein.
In the present invention, the photocuring is preferably step photocuring; the light curing light is preferably UV light. In the present invention, the step photocuring preferably includes a first step photocuring and a second step photocuring; the light intensity of the first step of photocuring is preferably 0.1-5 mW/cm2More preferably 0.5 to 4.0mW/cm2Most preferably 1.5 to 3.0mW/cm2(ii) a The first-step photocuring time is preferably 0.5-6 min, more preferably 1-5 min, and most preferably 2-4 min. In the invention, the light intensity of the second step of photocuring is preferably 5-15 mW/cm2More preferably 8-12 mW/cm2Most preferably 9-11 mW/cm2(ii) a The second step of photo-curing is preferably performed for 1-10 min, more preferably for 2-8 min, and most preferably for 4-6 min. In the present invention, the first photo-curing forms a polymer layer on the surface layer of the liquid crystal layer to enhance adhesion, and the second photo-curing functions to deeply cure the prepolymer. In the invention, the liquid crystal layer prepared by the step-by-step photocuring is a polymer layer and a polymer + liquid crystal layer.
The invention also provides a liquid crystal handwriting pad which comprises an upper shell, a liquid crystal membrane, a circuit board, a battery and a lower shell which are arranged in sequence, wherein the liquid crystal membrane is the liquid crystal handwriting membrane or the liquid crystal handwriting membrane prepared by the preparation method of the technical scheme.
The preparation method of the liquid crystal writing pad is not limited in any way, and the preparation method known to those skilled in the art can be adopted.
The liquid crystal handwriting film, the preparation method thereof and the liquid crystal handwriting board provided by the invention are described in detail with reference to the following examples, but the invention is not to be construed as being limited by the scope of the invention.
Example 1
Taking a 125-AGCL-KSANY-500 transparent film ITO substrate of Kangsheng opto-electronic technology Limited as a first substrate and taking a black ITO base material of LWH188-A as a second substrate (the thicknesses are 125 mu m and 188 mu m respectively);
600g of polyvinyl alcohol powder (Japanese Coli PVA-117) was dissolved in 20000g of deionized water at a mass ratio of 3:100 under stirring, and after stirring at 80 ℃ for 12 hours, the solution was filtered through a 200-mesh filter to prepare a polymer solution.
500g of the polymer solution and 4g of a spacer (5 μm, TN-500 microsphere of Zhenjiang Eiguan Co., Ltd.) were mixed for 24 hours to obtain a mixed coating solution;
coating the coating liquid to the surface of the ITO of the second substrate (the thickness of the obtained wet film is 15 mu m) in a micro-concave coating mode, and curing (140 ℃ and 2min) to obtain the polymer layer with the spacers (the area ratio of the spacers to the polymer layer is 0.0015: 1);
750g of a cholesteric liquid crystal material (fuming in a tabacco, liquid crystal type is LC-6T486), 100g of tetrahydrofuran acrylate, 100g of isobornyl acrylate, 30g of tris (2-hydroxyethyl) isocyanurate triacrylate and 20g of 2,4, 6-trimethylbenzoylphenylphosphonic acid ethyl ester are mixed under stirring (mixing temperature is 60 ℃ and time is 12 hours) according to a mass ratio of 75:10:10:3:2 to obtain a liquid crystal slurry;
coating the liquid crystal slurry (coating speed is 0.4m/min) between the first substrate with the first conductive layer and the second substrate with the second conductive layer by adopting an extrusion coating mode, and carrying out photocuring (UV wavelength is 365nm, and the light intensity of the first step of photocuring is 2 mW/cm)2For 1 min; the light intensity of the second step of photocuring is 10mW/cm2Time of 9min), obtaining the liquid crystal handwriting diaphragm, and wiping off the polymer layer by using alcohol when using the liquid crystal handwriting diaphragm.
Example 2
A first substrate made of 125-AGCL-KSANY-500 transparent ITO (indium tin oxide) of Kangsheng optical technology Co., Ltd and a second substrate made of LWH188-A black ITO base material (the thickness is 125 μm and 188 μm respectively);
mixing 500g of aqueous UV polyurethane solution (JZ-4234, Nanjing Jia chemical technology Co., Ltd.) and 4g of spacer (GS-400 microsphere of 3 μm, Zhenjianaitie) for 24h to obtain a mixed coating liquid;
pre-curing by a micro-concave coating process, wherein the temperature of an oven is set to be 140 ℃, and the curing time of the oven is 1 min; the UV light intensity is 10mW/cm2Performing crosslinking curing for 2 min; the coating base material is as follows: the ITO surface of the first substrate was coated at a rate of 20m/min, the wet film thickness was 15 μm, and the dry film thickness was 1 μm after curing. A layer of polymer was formed on top of the ITO substrate with spacers fixed inside the polymer (area ratio of spacer to polymer layer was 0.0026: 1).
Mixing 800g of cholesteric liquid crystal material (Hebei Meilston electronic material Co., Ltd., MS-N06), 150g of isotridecyl methacrylate, 50g of ethoxylated 1, 6-hexanediol diacrylate, 20gDR-E522 of an acrylic medium molecular weight prepolymer (Taiwan Changxing chemical industry Co., Ltd.) and 15g of 2-methyl-2- (4-morpholinyl) -1- [4- (methylthio) phenyl ] -1-acetone under stirring (the mixing temperature is 40 ℃ and the mixing time is 5 hours) according to a mass ratio of 80:15:5:2:1.5 to obtain liquid crystal slurry;
coating the liquid crystal slurry (coating speed is 0.5m/min) between the first substrate with the first conductive layer and the second substrate with the second conductive layer by adopting an extrusion coating mode, and performing photocuring (light intensity of photocuring is 10 mW/cm)2And the time is 5min), obtaining the liquid crystal handwriting film, and wiping off the polymer layer by using alcohol when using the pin electrode.
Example 3
A first substrate made of 125-AGCL-KSANY-500 transparent ITO (indium tin oxide) of Kangsheng optical technology Co., Ltd and a second substrate made of LWH188-A black ITO base material (the thickness is 125 μm and 188 μm respectively);
500g of a polyimide solution (DuPont, SP-21, USA) and 4g of a spacer (4 μm, GS-400 microsphere of Zhenjiang Aitie) were mixed for 24 hours to obtain a mixed coating liquid;
coating the coating liquid to the surface of the ITO of the second substrate (the thickness of the obtained wet film is 15 mu m) in a micro-concave coating mode, and curing (150 ℃,40min) to obtain the polymer layer with the spacers (the area ratio of the spacers to the polymer layer is 0.002: 1);
mixing 700g of cholesteric liquid crystal material (fuming on a cigarette table, and the liquid crystal type is LC-111-530), 200g of 2-methoxyethyl acrylate, 50g of polypropylene glycol diacrylate, 30gDR-E522 acrylic acid type intermediate molecular weight prepolymer (Taiwan Changxing chemical industry Co., Ltd.) and 10g of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide under the condition of stirring (the mixing temperature is 40 ℃ and the mixing time is 5 hours) according to the mass ratio of 70:20:5:3:1 to obtain liquid crystal slurry;
coating the liquid crystal slurry (coating speed is 0.4m/min) between the first substrate with the first conductive layer and the second substrate with the second conductive layer by adopting an extrusion coating mode, and carrying out photocuring (UV wavelength is 365nm, and the light intensity of the first step of photocuring is 3 mW/cm)2For 1 min; the light intensity of the second step of photocuring is 15mW/cm2And the time is 5min), obtaining the liquid crystal handwriting film, and wiping off the polymer layer by using alcohol when using the pin electrode.
Example 4
The liquid crystal handwriting films prepared in examples 1 to 3 were assembled in the order of the upper case, the liquid crystal film, the circuit board, the battery and the lower case to prepare a liquid crystal handwriting board.
The conducting layer of the single-chip substrate containing the spacers manufactured by the method adopts the wind speed of 30m/s, the included angle between the conducting layer and the conducting layer surface is 20 degrees, the duration is 30s, and the movement of the spacers is not found;
a liquid crystal handwriting board prepared from the liquid crystal handwriting film prepared in the example 2 comprises the following steps: the pen with the pen point diameter of 3mm made of POM material is used for marking and drawing back and forth for 5W times with the force of 300g, and the spacer does not move obviously;
preparing a liquid crystal handwriting pad from the liquid crystal handwriting film prepared in the embodiments 1 and 3; the pen with the pen point diameter of 3mm made of POM material is used for writing back and forth for 5W times with the force of 500g, and the spacer does not move obviously;
the liquid crystal handwriting film prepared in the embodiment 1-3 is prepared into a large-size liquid crystal film with the thickness of 2.0m 1.2m 1m according to the method, the large-size liquid crystal film is vertically placed, and is respectively placed at 50 ℃ for 7 days, 10 ℃ for 7 x 24 hours, 50 ℃ for 0.5 hour, 10 ℃ for 0.5 hour, and the spacer is not moved after the liquid crystal handwriting film is subjected to cooling and heating circulation (-10 ℃ to 50 ℃) for 7 days.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A liquid crystal handwriting diaphragm comprises a first substrate, a first conducting layer, a polymer layer, a liquid crystal layer, a second conducting layer and a second substrate which are sequentially stacked;
or comprises a first substrate, a first conducting layer, a liquid crystal layer, a polymer layer, a second conducting layer and a second substrate which are arranged in sequence;
the polymer layer includes a polymer material layer and spacers uniformly fixed in the polymer material layer.
2. The liquid crystal handwriting film of claim 1, wherein the transmittance of said second substrate is 0% to 90%;
the transmittance of the first substrate is 20% -95%.
3. The liquid crystal writing film of claim 1 or 2, wherein the layer of polymer material has a thickness of 5 μm or less;
the polymer in the polymer material layer is one or more of acrylic polyester polymer, polyurethane polymer, polyimide polymer and polyvinyl alcohol polymer.
4. The liquid crystal writing film of claim 1, wherein the spacer has a particle size of 2 to 10 μm.
5. The liquid crystal writing film of claim 1, wherein the area ratio of the spacer to the polymer layer is (0.001 to 1): 1.
6. the liquid crystal writing film of claim 1, wherein the polymer layer is prepared by a method comprising the steps of:
mixing the spacer and the polymer solution to obtain a coating liquid;
and coating the coating liquid on the surface of the first conductive layer or the second conductive layer to obtain a polymer layer.
7. The liquid crystal handwriting film of claim 6, wherein the coating mode is micro-concave coating or slit coating;
the coating speed is 1-50 m/min;
the curing temperature is 80-200 ℃, and the curing time is 0.5-20 min.
8. The method for preparing the liquid crystal handwriting film of any one of claims 1 to 7, characterized by comprising the following steps:
preparing a first conductive layer on one surface of a first substrate to obtain the first substrate with the first conductive layer;
preparing a second conductive layer on one surface of the second substrate to obtain a second substrate with the second conductive layer;
coating a polymer layer on the first substrate with the first conductive layer or the second substrate with the second conductive layer to obtain a first substrate with the polymer layer and the first conductive layer;
and coating liquid crystal slurry between the first substrate with the polymer layer and the first conducting layer and the second substrate with the second conducting layer in an extrusion coating mode, and carrying out photocuring to obtain the liquid crystal handwriting film.
9. The method according to claim 8, wherein a coating speed of coating the liquid crystal paste between the first substrate having the polymer layer and the first conductive layer and the second substrate having the second conductive layer is 0.1 to 5 m/min;
the photocuring is one-step photocuring or step-by-step photocuring;
when the coating liquid is coated on the first conductive layer, the photocuring is one-step photocuring or step-by-step photocuring, and the light intensity of the one-step photocuring is 5-15 mW/cm2The one-step photocuring time is 1-20 min;
the step photocuring comprises a first step photocuring and a second step photocuring;
the light intensity of the first step of photocuring is 0.1-5 mW/cm2The first step of photocuring lasts for 0.5-6 min;
the light intensity of the second step of photocuring is 5-15 mW/cm2The first step of photocuring lasts for 1-10 min;
when the coating liquid is coated on the second conductive layer, the photocuring is step photocuring;
the step photocuring comprises a first step photocuring and a second step photocuring;
the light intensity of the first step of photocuring is 0.1-5 mW/cm2The first step of photocuring lasts for 0.5-6 min;
the light intensity of the second step of photocuring is 5-15 mW/cm2And the first step of photocuring lasts for 1-10 min.
10. A liquid crystal handwriting pad, which comprises an upper shell, a liquid crystal membrane, a circuit board, a battery and a lower shell which are arranged in sequence, and is characterized in that the liquid crystal membrane is the liquid crystal handwriting membrane of any one of claims 1-7 or the liquid crystal handwriting membrane prepared by the preparation method of claim 8 or 9.
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Application publication date: 20200519 |