CN114815362B - PDLC dimming film with wide working temperature range and preparation method thereof - Google Patents
PDLC dimming film with wide working temperature range and preparation method thereof Download PDFInfo
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- CN114815362B CN114815362B CN202210385223.9A CN202210385223A CN114815362B CN 114815362 B CN114815362 B CN 114815362B CN 202210385223 A CN202210385223 A CN 202210385223A CN 114815362 B CN114815362 B CN 114815362B
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- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 title claims abstract description 98
- 238000002360 preparation method Methods 0.000 title abstract description 23
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 66
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 22
- 239000000178 monomer Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 239000003999 initiator Substances 0.000 claims abstract description 14
- 238000011049 filling Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 16
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- LNMQRPPRQDGUDR-UHFFFAOYSA-N hexyl prop-2-enoate Chemical compound CCCCCCOC(=O)C=C LNMQRPPRQDGUDR-UHFFFAOYSA-N 0.000 claims description 10
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims description 8
- 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 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- JHWGFJBTMHEZME-UHFFFAOYSA-N 4-prop-2-enoyloxybutyl prop-2-enoate Chemical compound C=CC(=O)OCCCCOC(=O)C=C JHWGFJBTMHEZME-UHFFFAOYSA-N 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 claims description 5
- 230000008025 crystallization Effects 0.000 claims description 5
- INQDDHNZXOAFFD-UHFFFAOYSA-N 2-[2-(2-prop-2-enoyloxyethoxy)ethoxy]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOCCOC(=O)C=C INQDDHNZXOAFFD-UHFFFAOYSA-N 0.000 claims description 4
- HCLJOFJIQIJXHS-UHFFFAOYSA-N 2-[2-[2-(2-prop-2-enoyloxyethoxy)ethoxy]ethoxy]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOCCOCCOC(=O)C=C HCLJOFJIQIJXHS-UHFFFAOYSA-N 0.000 claims description 4
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 claims description 4
- 239000005264 High molar mass liquid crystal Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 244000028419 Styrax benzoin Species 0.000 claims description 4
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 4
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 4
- 229960002130 benzoin Drugs 0.000 claims description 4
- 125000004386 diacrylate group Chemical group 0.000 claims description 4
- 235000019382 gum benzoic Nutrition 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- ZDQNWDNMNKSMHI-UHFFFAOYSA-N 1-[2-(2-prop-2-enoyloxypropoxy)propoxy]propan-2-yl prop-2-enoate Chemical compound C=CC(=O)OC(C)COC(C)COCC(C)OC(=O)C=C ZDQNWDNMNKSMHI-UHFFFAOYSA-N 0.000 claims description 2
- FTALTLPZDVFJSS-UHFFFAOYSA-N 2-(2-ethoxyethoxy)ethyl prop-2-enoate Chemical compound CCOCCOCCOC(=O)C=C FTALTLPZDVFJSS-UHFFFAOYSA-N 0.000 claims description 2
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 claims description 2
- HPSGLFKWHYAKSF-UHFFFAOYSA-N 2-phenylethyl prop-2-enoate Chemical compound C=CC(=O)OCCC1=CC=CC=C1 HPSGLFKWHYAKSF-UHFFFAOYSA-N 0.000 claims description 2
- GDUZPNKSJOOIDA-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]heptan-4-yl 2-methylprop-2-enoate Chemical compound C1C(OC(=O)C(=C)C)CCC2OC21 GDUZPNKSJOOIDA-UHFFFAOYSA-N 0.000 claims description 2
- AMFGWXWBFGVCKG-UHFFFAOYSA-N Panavia opaque Chemical compound C1=CC(OCC(O)COC(=O)C(=C)C)=CC=C1C(C)(C)C1=CC=C(OCC(O)COC(=O)C(C)=C)C=C1 AMFGWXWBFGVCKG-UHFFFAOYSA-N 0.000 claims description 2
- -1 acrylic ester Chemical class 0.000 claims description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 2
- 210000002858 crystal cell Anatomy 0.000 claims description 2
- KBLWLMPSVYBVDK-UHFFFAOYSA-N cyclohexyl prop-2-enoate Chemical compound C=CC(=O)OC1CCCCC1 KBLWLMPSVYBVDK-UHFFFAOYSA-N 0.000 claims description 2
- MZRQZJOUYWKDNH-UHFFFAOYSA-N diphenylphosphoryl-(2,3,4-trimethylphenyl)methanone Chemical compound CC1=C(C)C(C)=CC=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 MZRQZJOUYWKDNH-UHFFFAOYSA-N 0.000 claims description 2
- YDKNBNOOCSNPNS-UHFFFAOYSA-N methyl 1,3-benzoxazole-2-carboxylate Chemical compound C1=CC=C2OC(C(=O)OC)=NC2=C1 YDKNBNOOCSNPNS-UHFFFAOYSA-N 0.000 claims description 2
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 claims description 2
- FEUIEHHLVZUGPB-UHFFFAOYSA-N oxolan-2-yl prop-2-enoate Chemical compound C=CC(=O)OC1CCCO1 FEUIEHHLVZUGPB-UHFFFAOYSA-N 0.000 claims description 2
- WRAQQYDMVSCOTE-UHFFFAOYSA-N phenyl prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1 WRAQQYDMVSCOTE-UHFFFAOYSA-N 0.000 claims description 2
- FSDNTQSJGHSJBG-UHFFFAOYSA-N piperidine-4-carbonitrile Chemical compound N#CC1CCNCC1 FSDNTQSJGHSJBG-UHFFFAOYSA-N 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 description 22
- 238000002834 transmittance Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 17
- 239000011159 matrix material Substances 0.000 description 9
- 230000005684 electric field Effects 0.000 description 6
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 150000001252 acrylic acid derivatives Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- NTWSIWWJPQHFTO-AATRIKPKSA-N (2E)-3-methylhex-2-enoic acid Chemical compound CCC\C(C)=C\C(O)=O NTWSIWWJPQHFTO-AATRIKPKSA-N 0.000 description 1
- GQSMQNSPDSAXDD-UHFFFAOYSA-N CCC(=O)C(C)(O)Cc1ccccc1 Chemical compound CCC(=O)C(C)(O)Cc1ccccc1 GQSMQNSPDSAXDD-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- ZDHCZVWCTKTBRY-UHFFFAOYSA-N omega-Hydroxydodecanoic acid Natural products OCCCCCCCCCCCC(O)=O ZDHCZVWCTKTBRY-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004984 smart glass Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1809—C9-(meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/281—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/282—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing two or more oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
- C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
- C08F222/102—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a PDLC dimming film with a wide working temperature range, which is prepared from the following raw materials of ultraviolet polymerizable monomers, a cross-linking agent, liquid crystal and an ultraviolet initiator; the invention also discloses a preparation method of the liquid crystal display device, which is prepared by uniformly mixing the components and then filling the mixture into a liquid crystal box for curing. The PDLC dimming film provided by the invention has good adhesive force, stability and electro-optical performance, can widen the working temperature of the PDLC dimming film, and effectively solves the problems of low contrast ratio at high temperature, high driving voltage at low temperature and high response time of the PDLC dimming film in the prior art. The PDLC dimming film can be widely applied to the preparation of the PDLC dimming film, and the prepared PDLC dimming film can be further applied to outdoor intelligent windows and automobile skylights.
Description
Technical Field
The invention belongs to the technical field of application of liquid crystal materials, relates to a liquid crystal film, and particularly relates to a PDLC dimming film with a wide working temperature range and a preparation method thereof.
Background
The current society, environmental protection and intelligent materials are filling the aspects of our daily lives. The intelligent window can control radiation flux, reduce energy consumption and protect privacy, so that the intelligent window has huge potential application in the fields of building design, automobile manufacturing and the like. Among smart window devices, polymer Dispersed Liquid Crystal (PDLC) films have been favored by students in the last 40 years due to their excellent modulatability, ease of processing, and commercial potential.
In general, a PDLC film has a sandwich structure in which two transparent conductive films are used as substrates, with a liquid crystal/polymer composite layer in between. By applying an electric field, the orientation of the liquid crystal molecules can be changed when the ordinary refractive index (n o ) Refractive index with polymer (n p ) When matched, the PDLC film can achieve a transition from the scattering state to the transparent state. By applying different voltages, the transmittance of solar radiation through the film can be adjusted.
The working temperature range of most commercial dimming films is-20 ℃ to 70 ℃. However, when the operating temperature is lower than-20 ℃, the response time of the PDLC film is significantly delayed, and when the operating temperature is higher than 70 ℃, the contrast of the light-adjusting film becomes poor, and the light-adjusting film is in a semitransparent state. Therefore, if the PDLC film is applied to outdoor intelligent windows and automobile windows, it is important to further widen the working temperature of the PDLC film on the premise of ensuring good electro-optical performance of the PDLC film. Basically, the properties of PDLC films are mainly controlled by the liquid crystal material, since they can form an active phase, and under high temperature conditions, the birefringence of the liquid crystal becomes small, which inevitably deteriorates the contrast ratio; under low temperature conditions, the viscosity of the liquid crystal becomes high, which makes it difficult for the liquid crystal molecules to rotate, thereby increasing the driving voltage and response time. In general, the rotational viscosity of a liquid crystal material is denoted by γ, which is very sensitive to low temperatures, and is exponentially related (γ. Alpha. Exp (B/T)), where B is a constant parameter and T is temperature. When the temperature T is reduced by 20 ℃, the viscosity γ will rise 3 to 5 times. Therefore, increasing the clearing point and decreasing the low temperature viscosity of the liquid crystal material are critical to widening the operating temperature range of the PDLC film. In addition, the properties of the polymer matrix should be matched to the liquid crystal, since the electro-optical properties of PDLC films are mainly affected by the microscopic morphology of the polymer matrix and interface anchoring effects.
Disclosure of Invention
The invention aims to provide a polymer dispersed liquid crystal dimming film with a wide working temperature range, so as to widen the working temperature range of the film, and enable the film to have good electro-optic performance at high temperature or low temperature;
another object of the present invention is to provide a method for preparing the above polymer dispersed liquid crystal dimming film having a wide operating temperature range.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the PDLC dimming film with a wide working temperature range comprises a composite layer structure formed by sequentially stacking a first transparent conductive film, a polymer liquid crystal composite material and a second transparent conductive film into a whole along the thickness direction, wherein the polymer liquid crystal composite material comprises an ultraviolet polymerizable monomer, a cross-linking agent, liquid crystal and an ultraviolet initiator;
20-40 parts of ultraviolet polymerizable monomer and cross-linking agent and 60-80 parts of liquid crystal;
the weight of the ultraviolet initiator is 0.5-2% of the total weight of the ultraviolet polymerizable monomer, the cross-linking agent and the liquid crystal;
the mass ratio of the ultraviolet polymerizable monomer to the cross-linking agent is 1-5:1.
As a definition of the liquid crystal as nematic liquid crystal, the birefringence is greater than 0.2, the crystallization point is lower than-40 ℃, the clearing point is higher than 120 ℃, the viscosity is less than 120mPas, and the dielectric anisotropy is greater than 5.
As another definition, the uv-polymerizable monomers include acrylates bearing a large group at the end and acrylates having an alkyl chain at the end.
As a further limitation, the acrylate having a large group at the end includes at least one of isobornyl acrylate, 2-phenylethyl acrylate, 3, 4-epoxycyclohexyl methacrylate, tetrahydrofuranyl acrylate, dicyclopentanyl acrylate, phenyl acrylate, cyclohexyl acrylate and glycidyl acrylate;
the acrylic ester with the terminal of the alkyl chain comprises at least one of 3, 5-trimethylhexyl acrylate, 2-ethylhexyl acrylate, hexyl acrylate, butyl acrylate and ethoxyethoxyethyl acrylate.
By way of further limitation, the weight ratio of acrylate with a large group at the end to acrylate with an alkyl chain at the end is 1-3:1-3.
As a third limitation, the crosslinking agent is a difunctional acrylate, including at least one of triethylene glycol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, polyethylene glycol diacrylate, 1, 6-hexanediol diacrylate, 1, 4-butanediol diacrylate, 1, 10-hexanediol diacrylate, bisphenol a glycerol dimethacrylate, tetraethylene glycol diacrylate, and tripropylene glycol diacrylate.
By way of further limitation, the polyethylene glycol diacrylate has a molecular weight of 200.
As a fourth limitation, the ultraviolet initiator is at least one of benzoin diethyl ether, 2-hydroxy-2-methyl-1-phenylpropione, trimethylbenzoyl diphenyl phosphine oxide, and benzoin diethyl ether.
The invention also provides a preparation method of the PDLC dimming film with the wide working temperature range, which comprises the following steps in sequence:
s1, uniformly mixing an ultraviolet polymerizable monomer, a cross-linking agent, liquid crystal and an ultraviolet initiator, and filling the mixture into a liquid crystal box to obtain a sample A;
s2, solidifying the sample A to obtain the PDLC dimming film with the wide working temperature range.
As a limitation, in step S1, the liquid crystal cell is made of two pieces of conductive glass coated with indium tin oxide, and has a thickness of 19 to 21 μm.
As another limitation, in the step S2, the curing temperature is 0-10 ℃ higher than the isotropy temperature of the mixed system, the time is 200-800S, and the light intensity is 10-20 mW/cm 2 。
By adopting the technical scheme, compared with the prior art, the invention has the following technical progress:
(1) the ultraviolet polymerizable monomer selected by the invention has low price and low monomer toxicity;
(2) the low-viscosity nematic liquid crystal with wide temperature range is selected, and meanwhile, the variety and the dosage of the polymerizable monomer with high adaptation degree and the curing condition are optimized, so that the PDLC dimming film with wide working temperature range is prepared, the contrast ratio is more than 20 at 110 ℃, the shielding property is better, the rising and falling time is quicker at-40 ℃, the rising and falling time is respectively less than 3s and 20s, and the PDLC dimming film has the beneficial effects of short corresponding time and low driving voltage;
(3) the PDLC dimming film provided by the invention has good adhesive force, stability and electro-optical performance, is beneficial to improving the practical value of the PDLC dimming film in outdoor application, and effectively solves the problems of low contrast ratio at high temperature, high driving voltage at low temperature and high response time of the PDLC dimming film in the prior art;
(4) the preparation method provided by the invention has the advantages of simple and operable preparation process and short curing time, and is suitable for large-area production of PDLC.
The invention is suitable for preparing the polymer dispersed liquid crystal dimming film with a wide working temperature range, and the prepared polymer dispersed liquid crystal dimming film can be further applied to high-temperature and low-temperature environments.
Drawings
FIG. 1 is a graph showing voltage-transmittance curves of the electronically controlled dimming film material prepared in example 1 at different temperatures;
FIG. 2 is a scanning electron micrograph of a polymer-based microstructure of the electronically controlled privacy film material prepared in example 1;
FIG. 3 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 7 at different temperatures;
FIG. 4 is a scanning electron micrograph of a polymer-based microstructure of the electronically controlled privacy film material prepared in example 7;
FIG. 5 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 8 at different temperatures;
FIG. 6 is a scanning electron micrograph of a polymer-based microstructure of the electronically controlled privacy film material prepared in example 8;
FIG. 7 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 9 at different temperatures;
FIG. 8 is a scanning electron micrograph of a polymer-based microstructure of the electronically controlled privacy film material prepared in example 9;
FIG. 9 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 10 at different temperatures;
FIG. 10 is a scanning electron micrograph of a polymer-based micro morphology of the electronically controlled privacy film material prepared in example 10;
FIG. 11 is a graph showing voltage-transmittance curves for the electronically controlled dimming film material prepared in example 11 at different temperatures;
fig. 12 is a graph of voltage-transmittance curves for the electronically controlled dimming film material prepared in example 12 at different temperatures.
Detailed Description
The invention will now be described in further detail by way of specific examples, which are to be understood as illustrative only and not limiting.
In the invention, the percentages are mass percentages, and each symbol represents the following meaning:
T off the light transmittance (off state transmittance) of the PDLC when no electric field is applied; t (T) on Represents the light transmittance (on state transmittance) of the PDLC under the application of an electric field of 100V; v (V) sat Represents saturation voltage, which means when PDLC light transmittance reaches T on 90% of the required voltage; CR represents contrast, and the calculation method is as follows: cr=t on /T off ；t R The rising time is represented, and the transmittance reaches 90% T when an electric field is applied on The time required; t is t D Indicating the falling time, means that the transmittance of the film is reduced to 10% T after the electric field is removed on Is a time of (a) to be used.
Example 1 preparation method of PDLC dimming film with broad operating temperature Range
The embodiment is a preparation method of a PDLC dimming film with a wide working temperature range, comprising the following steps in sequence:
s1, mixing an ultraviolet polymerizable monomer IBOA (isobornyl acrylate), TMHA (3, 5-trimethylhexyl acrylate), a cross-linking agent BDDA (1, 4-butanediol diacrylate), liquid crystal GXP-6011 and an ultraviolet initiator Irg651 according to the mass fraction ratio of table 1, fully and uniformly stirring, and then filling the mixture into a liquid crystal box made of two pieces of conductive glass plated with indium tin oxide, wherein the thickness of the liquid crystal box is controlled to be 20.0 mu m;
s2, the liquid crystal box in the S1 is processed at 30 ℃ and the ultraviolet intensity is 10mW/cm 2 Curing for 500s under the condition to prepare a PDLC dimming film X1 with a wide working temperature range;
wherein the temperature of the mixed system in isotropy is 25 ℃;
table 1 composition of sample in example 1
Wherein the birefringence of the liquid crystal GXP-6011 is 0.208, the crystallization point is lower than-40 ℃, the clearing point is 121 ℃, the viscosity is 72mPas, and the dielectric anisotropy is 13.4;
the electro-optical performance curves of the PDLC dimming film X1 prepared by the method at different temperatures are measured by a liquid crystal comprehensive parameter tester, as shown in figure 1;
as can be seen from fig. 1, the PDLC dimming film X1 has a small driving voltage at a high temperature of 110 ℃ and has a severe right shift of the electro-optic curve at a low temperature of-40 ℃ with a decrease in on-state transmittance. The main electro-optical properties of the light adjusting film X1 are shown in table 2:
TABLE 2 Main electro-optical Properties of PDLC dimmer film X1
| Testing temperature (. Degree. C.) | V sat (V) | CR | t R (ms) | t D (ms) |
| 110 | 10 | 19 | 0.25 | 4.8 |
| -40 | 72 | 189 | 4800 | 18200 |
As can be seen from table 2, the PDLC dimming film X1 had a CR of 19 for the sample at a high temperature of 110 ℃, and the sample had a rapid rise time and fall time; and the voltage and the response time are greatly increased under the condition of low temperature of minus 40 ℃.
The polymer network of the PDLC dimming film X1 was observed with a Scanning Electron Microscope (SEM), and the result is shown in fig. 2;
as can be seen from FIG. 2, X1 has smaller polymer mesh with an average mesh size of 2 μm, which ensures a higher contrast at high temperatures.
Examples 2-6 preparation method of PDLC Dimmable films with broad operating temperature Range
Examples 2 to 6 are respectively a preparation method of a PDLC dimming film with a wide operating temperature range, and the steps are basically the same as those of example 1, except that the raw material amount and the process parameters are different, and the details are shown in table 3:
table 3 list of process parameters in examples 2 to 6
Examples 2 to 6 respectively prepare PDLC dimming films X2 to X6 having a wide operating temperature range;
wherein the liquid crystal GXP-6015 has a birefringence of 0.250, a crystallization point of < -40 ℃, a clearing point of 122 ℃, a viscosity of 107mPas and a dielectric anisotropy of 18.9.
Example 7 preparation method of PDLC dimming film with broad operating temperature Range
The embodiment is a preparation method of a PDLC dimming film with a wide working temperature range, comprising the following steps in sequence:
s1, mixing an ultraviolet polymerizable monomer IBOA (isobornyl acrylate), HA (n-hexyl acrylate), a cross-linking agent BDDA (1, 4-butanediol diacrylate), liquid crystal GXP-6011 and an ultraviolet initiator Irg651 according to the mass fraction ratio of the table 4, and filling the mixture into a liquid crystal box made of two pieces of conductive glass plated with indium tin oxide after fully and uniformly stirring, wherein the thickness of the liquid crystal box is controlled to be 20.0 mu m;
s2, the liquid crystal box in the S1 is subjected to ultraviolet light with the intensity of 10mW/cm at the temperature of 28 DEG C 2 Curing for 500s, and preparing a PDLC dimming film X7 with a wide working temperature range;
TABLE 4 composition of samples in example 7
The electro-optical performance curves of the PDLC dimming film X7 prepared above at different temperatures are measured by a liquid crystal comprehensive parameter tester, as shown in figure 3; the main electro-optical properties of PDLC dimming film X7 are given in table 5:
TABLE 5 Main electro-optical Properties of PDLC dimmer film X7
| Testing temperature (. Degree. C.) | V sat (V) | CR | t R (ms) | t D (ms) |
| 110 | 12 | 22 | 0.34 | 5.8 |
| -40 | 69 | 239 | 2740 | 12400 |
As can be seen from fig. 3 and table 5, the PDLC dimming film X7 has a CR of 20 or more, maintains good contrast, and has good shielding property in the off state at a high temperature of 110 ℃, and the sample has a rapid rise time and fall time; and at the low temperature of-40 ℃, the electro-optical curve of the sample is greatly shifted to the right, the on-state transmittance is reduced, and meanwhile, the voltage and the response time are also greatly reduced, so that the reduction time is much faster at the low temperature compared with the PDLC dimming film X1 in the example 1.
The polymer network of the PDLC dimming film X7 was observed with a Scanning Electron Microscope (SEM), and the result is shown in fig. 4;
as can be seen from FIG. 4, the X7 polymer matrix has a uniform and dense mesh with an average mesh size of 1.5 μm, which is critical for higher contrast at high temperatures and faster response times at low temperatures.
Example 8 preparation method of PDLC dimming film with broad operating temperature Range
The embodiment is a preparation method of a PDLC dimming film with a wide working temperature range, comprising the following steps in sequence:
s1, mixing an ultraviolet polymerizable monomer IBOA (isobornyl acrylate), HA (n-hexyl acrylate), a cross-linking agent HDDA (1, 6-hexanediol diacrylate), liquid crystal GXP-6011 and an ultraviolet initiator Irg651 according to the mass fraction ratio of Table 6, and filling the mixture into a liquid crystal box made of two pieces of conductive glass plated with indium tin oxide after the mixture is fully and uniformly stirred, wherein the thickness of the liquid crystal box is controlled to be 20.0 mu m;
s2, the liquid crystal box in the S1 is subjected to ultraviolet light with the intensity of 10mW/cm at the temperature of 38 DEG C 2 Curing for 500s, and preparing a PDLC dimming film X8 with a wide working temperature range;
TABLE 6 composition of samples in example 8
The electro-optical performance curves of the PDLC dimming film X8 prepared above at different temperatures are measured by a liquid crystal comprehensive parameter tester, as shown in FIG. 5; meanwhile, table 7 shows main electro-optical performance parameters of the PDLC dimming film X8:
TABLE 7 Main electro-optical Properties of PDLC dimmer film X8
As can be seen from fig. 5 and table 7, the PDLC light modulation film X8 showed a decrease in CR of the sample at a high temperature of 110 ℃, because the chain length of the crosslinking agent became longer, the polymerization rate became slower, the mesh size of the polymer matrix became larger, and the off state transmittance became larger; and at low temperature-40 deg.c, the saturation voltage of the sample is lowered.
The polymer network of the PDLC dimming film X8 was observed with a Scanning Electron Microscope (SEM), and the result is shown in fig. 6;
as can be seen from FIG. 6, the size of the X8 polymer matrix is slightly increased as compared with that of X7, and the polymerization rate is lowered and the size of the polymer matrix is increased due to the length of the chain of the crosslinking agent.
Example 9 preparation method of PDLC dimming film with broad operating temperature Range
The embodiment is a preparation method of a PDLC dimming film with a wide working temperature range, comprising the following steps in sequence:
s1, mixing an ultraviolet polymerizable monomer IBOA (isobornyl acrylate), HA (n-hexyl acrylate), a cross-linking agent PEGDA400 (polyethylene glycol diacrylate with the molecular weight of 400), liquid crystal GXP-6011 and an ultraviolet initiator Irg651 according to the mass fraction ratio of Table 8, fully and uniformly stirring, and then pouring the mixture into a liquid crystal box made of two pieces of conductive glass plated with indium tin oxide, wherein the thickness of the liquid crystal box is controlled to be 20.0 mu m;
s2, the liquid crystal box in the S1 is subjected to ultraviolet light with the intensity of 10mW/cm at the temperature of 42 DEG C 2 Curing for 500s, and preparing a PDLC dimming film X9 with a wide working temperature range;
TABLE 8 composition of samples in example 9
The electro-optical performance curves and main electro-optical performance parameters of the prepared PDLC dimming film X9 at different temperatures are measured by a liquid crystal comprehensive parameter tester, and are shown in fig. 7 and table 9, respectively:
TABLE 9 Main electro-optical Properties of PDLC dimmer film X9
| Testing temperature (. Degree. C.) | V sat (V) | CR | t R (ms) | t D (ms) |
| 110 | 8 | 10 | 0.36 | 15.4 |
| -40 | 64 | 168 | 1610 | 16400 |
As can be seen from fig. 7 and table 9, the PDLC dimming film X9 has serious CR loss of the sample at a high temperature of 110 ℃, and the film shows a semitransparent state in the off state; at the low temperature of-40 ℃, the liquid crystal molecules need a long time to be reduced to return to the original state after the electric field is removed because of the increase of the meshes of the polymer matrix.
The polymer network of the PDLC dimming film X9 was observed with a Scanning Electron Microscope (SEM), and the result is shown in fig. 8;
as is clear from FIG. 8, the size of the mesh of the X9 polymer matrix is further increased, because the chain length and molecular weight of the crosslinking agent are increased, the polymerization rate of the system is lowered, the aggregation time of the liquid crystal droplets is prolonged, and the mesh is increased, and it is also revealed that the crosslinking agent chain is not excessively long in order to provide the light control film with a good contrast at high temperature.
Example 10 preparation method of PDLC dimming film with broad operating temperature Range
The embodiment is a preparation method of a PDLC dimming film with a wide working temperature range, comprising the following steps in sequence:
s1, mixing an ultraviolet polymerizable monomer IBOA (isobornyl acrylate), HA (n-hexyl acrylate), a cross-linking agent BDDA (1, 4-butanediol diacrylate), liquid crystal GXP-6015 and an ultraviolet initiator Irg651 according to the mass fraction ratio of Table 10, and filling the mixture into a liquid crystal box made of two pieces of conductive glass plated with indium tin oxide after fully and uniformly stirring, wherein the thickness of the liquid crystal box is controlled to be 20.0 mu m;
s2, the liquid crystal box in the S1 is subjected to ultraviolet light with the intensity of 10mW/cm at the temperature of 28 DEG C 2 Curing for 500s, and preparing a PDLC dimming film X10 with a wide working temperature range;
TABLE 10 composition of samples in example 10
The electro-optical performance curves of the PDLC dimming film X10 prepared above at different temperatures are measured by a liquid crystal comprehensive parameter tester, as shown in FIG. 9; table 11 gives the main electro-optical properties of PDLC dimming film X10:
TABLE 11 Main electro-optical Properties of electrically controlled Intelligent films prepared in example 10
| Testing temperature (. Degree. C.) | V sat (V) | CR | t R (ms) | t D (ms) |
| 110 | 13 | 23 | 0.65 | 6.4 |
| -40 | 75 | 289 | 1836 | 19300 |
As can be seen from a combination of fig. 9 and table 11, in this example, the contrast of the sample at high temperature is higher, and the saturation voltage and the fall time are slightly increased at-40 ℃, because the liquid crystal has a higher viscosity than GXP-6011, but the viscosity difference is larger at low temperature, resulting in a slight increase in the driving voltage and the response time.
The polymer network of the PDLC dimming film X10 was observed with a Scanning Electron Microscope (SEM), and the result is shown in fig. 10;
as can be seen from fig. 10, the X10 polymer matrix has a small and uniform mesh, ensuring a good contrast at high temperatures.
Example 11 preparation method of PDLC dimming film with broad operating temperature Range
The present example is a preparation method of a PDLC dimming film with a wide working temperature range, and the raw materials, steps and process parameters thereof are substantially the same as those of the PDLC dimming film X7 prepared in example 7, except that the liquid crystal GXP-6011 is replaced by a common commercial liquid crystal SLC1717, so as to prepare a PDLC dimming film X7', and specific components are shown in table 12:
table 12 composition of sample in example 11
The electro-optical performance curves and the main electro-optical performances of the PDLC dimming film X7' prepared above at different temperatures were measured by a liquid crystal integrated parameter tester, and are shown in fig. 11 and table 13, respectively:
TABLE 13 Main electro-optical Properties of electrically controlled Intelligent films prepared in example 11
| Testing temperature (. Degree. C.) | V sat (V) | CR | t R (ms) | t D (ms) |
| 95 | -- | 1 | 108.3 | 32.7 |
| -40 | 83 | 115 | 3610 | 23400 |
As can be seen from fig. 11 and table 13, the PDLC dimming film X7' has a straight line of electro-optic curve at a high temperature of 95 ℃, the liquid crystal is isotropic at this time, the film is transparent, the transmittance does not change with voltage, and the contrast ratio is 1; at-40 c, the film exhibits a high driving voltage and a slower response time because the liquid crystal SLC1717 also has a higher crystallization point.
Example 12 preparation method of PDLC dimming film with broad operating temperature Range
In this example, a high mechanical property, low driving voltage and high contrast liquid crystal dimming film (refer to the acrylate monomer formula described in example 1 with publication number CN113885245a, and the PDLC dimming film Y is prepared by using the liquid crystal used in example 2 of the present invention at the same curing temperature, curing light intensity and curing time).
The electro-optical performance curves and main electro-optical performance parameters of the prepared PDLC dimming film Y at different temperatures are measured by a liquid crystal comprehensive parameter tester as shown in fig. 12 and table 14 respectively:
TABLE 14 Main electro-optical Properties of electrically controlled Intelligent films prepared in example 12
| Testing temperature (. Degree. C.) | V sat (V) | CR | t R (ms) | t D (ms) |
| 110 | 11 | 6 | 0.83 | 20.7 |
| -40 | 79 | 135 | 1610 | 21400 |
As can be seen from fig. 12 and table 14, the PDLC light modulation film Y was in a semitransparent state at 110 ℃, the off state transmittance was 20% or more, the contrast was 6, and a higher driving voltage and a longer drop time were exhibited at a low temperature of-40 ℃.
Claims (9)
1. The PDLC dimming film with a wide working temperature range comprises a composite layer structure formed by sequentially stacking a first transparent conductive film, a polymer liquid crystal composite material and a second transparent conductive film into a whole along the thickness direction, and is characterized in that the polymer liquid crystal composite material comprises an ultraviolet polymerizable monomer, a cross-linking agent, liquid crystal and an ultraviolet initiator;
20-40 parts of ultraviolet polymerizable monomer and cross-linking agent and 60-80 parts of liquid crystal;
the weight of the ultraviolet initiator is 0.5-2% of the total weight of the ultraviolet polymerizable monomer, the cross-linking agent and the liquid crystal;
the mass ratio of the ultraviolet polymerizable monomer to the cross-linking agent is 1-5:1;
the liquid crystal is nematic liquid crystal, the double refractive index is more than 0.2, the crystallization point is lower than-40 ℃, the clearing point is higher than 120 ℃, the viscosity is less than 120mPas, and the dielectric anisotropy is more than 5.
2. The PDLC dimming film with wide operating temperature range of claim 1, wherein said uv polymerizable monomers comprise acrylate with big groups at end and acrylate with alkyl chains at end.
3. The PDLC dimming film with wide operating temperature range of claim 2, wherein said acrylate with big groups at end comprises at least one of isobornyl acrylate, 2-phenylethyl acrylate, 3, 4-epoxycyclohexyl methacrylate, tetrahydrofuranyl acrylate, dicyclopentanyl acrylate, phenyl acrylate, cyclohexyl acrylate and glycidyl acrylate;
the acrylic ester with the terminal of the alkyl chain comprises at least one of 3, 5-trimethylhexyl acrylate, 2-ethylhexyl acrylate, hexyl acrylate, butyl acrylate and ethoxyethoxyethyl acrylate.
4. A PDLC dimming film having a wide operating temperature range according to claim 2 or 3, wherein the weight ratio of acrylate with a large group at the end to acrylate with an alkyl chain at the end is 1-3:1-3.
5. A PDLC dimming film having a broad operating temperature range according to any of claims 1-3, wherein the cross-linking agent is a difunctional acrylate comprising at least one of triethylene glycol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, polyethylene glycol diacrylate, 1, 6-hexanediol diacrylate, 1, 4-butanediol diacrylate, 1, 10-sunflower glycol diacrylate, bisphenol a glycerol dimethacrylate, tetraethylene glycol diacrylate and tripropylene glycol diacrylate.
6. A PDLC dimming film having a broad operating temperature range according to any of claims 1-3, wherein said uv light initiator is at least one of benzoin diethyl ether, 2-hydroxy-2-methyl-1-phenyl acetone, trimethylbenzoyl diphenyl phosphine oxide, benzoin diethyl ether.
7. A method for producing a PDLC dimming film having a wide operating temperature range according to any of claims 1-6, comprising the following steps, which are performed in order:
s1, uniformly mixing an ultraviolet polymerizable monomer, a cross-linking agent, liquid crystal and an ultraviolet initiator, and filling the mixture into a liquid crystal box to obtain a sample A;
s2, solidifying the sample A to obtain the PDLC dimming film with the wide working temperature range.
8. The method for preparing a PDLC dimming film having a wide operating temperature range according to claim 7, wherein in step S1, said liquid crystal cell is made of two pieces of conductive glass plated with indium tin oxide, with a thickness of 19-21 μm.
9. The method for preparing a PDLC dimming film having a wide working temperature range as claimed in claim 7 or 8, wherein in the step S2, the curing temperature is 0-10 ℃ higher than the isotropy of the mixed system, the time is 200-800S, and the light intensity is 10-20 mW/cm 2 。
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