CN105602578A - PDLC composition with wide viewing angle - Google Patents

PDLC composition with wide viewing angle Download PDF

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CN105602578A
CN105602578A CN201510956748.3A CN201510956748A CN105602578A CN 105602578 A CN105602578 A CN 105602578A CN 201510956748 A CN201510956748 A CN 201510956748A CN 105602578 A CN105602578 A CN 105602578A
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peroxide
acrylate
methacrylate
liquid crystal
pdlc
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李正强
郭剑
张兴
华瑞茂
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Shijiazhuang Chengzhi Yonghua Display Material Co Ltd
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Shijiazhuang Chengzhi Yonghua Display Material Co Ltd
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    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
    • C09K19/126—Compounds containing at least one asymmetric carbon atom
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    • C09K19/00—Liquid crystal materials
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/14—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain
    • C09K19/18—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain the chain containing carbon-to-carbon triple bonds, e.g. tolans
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    • C09K19/00—Liquid crystal materials
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    • C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
    • C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters
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    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
    • C09K2019/121—Compounds containing phenylene-1,4-diyl (-Ph-)
    • C09K2019/122—Ph-Ph
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
    • C09K2019/127—Compounds containing phenylene-1,3-diyl
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/14—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain
    • C09K19/18—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain the chain containing carbon-to-carbon triple bonds, e.g. tolans
    • C09K2019/181—Ph-C≡C-Ph

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Abstract

The present invention discloses a PDLC composition with wide viewing angle. The PDLC composition comprise the following components by weight: 35.0-60.0% of a light curable material, 35.0-65.0% of a liquid crystal material and 0.1-5.0% of a photoinitiator; and the PDLC composition further comprises a spacer accounting for 0.1-0.3% total weight of the PDLC composition. The composition can be used as a dimming material in dimming film or dimming glass, has excellent viewing angle characteristics, and can improve the reduced transmittance of PDLC film surface in the case of side viewing, and can enhance the customer experience.

Description

PDLC composition with wide viewing angle
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a PDLC composition with a wide viewing angle, and especially relates to a PDLC dimming material with a wide viewing angle, which is applied to the dimming technical fields of dimming films, dimming glass, intelligent rear projection and the like.
Background
Polymer Dispersed Liquid Crystal (PDLC) is typically made into optical films by forming a network through a polymer, dispersing the liquid crystal in small droplets on the order of microns within the polymer network.
Due to scattering of the optical axis of the liquid crystal droplets, the refractive index of the extraordinary rays do not match the refractive index of the polymer network, and the refractive index does not match between liquid crystal droplets of different oriented optical axes, light is strongly scattered at the droplet/network, droplet/droplet interface when passing through the matrix to be in an opaque milky or translucent state.
The optical axis of the liquid crystal microdroplets can be turned by applying an electric field, and when the refractive index of extraordinary rays of the liquid crystal is matched with the refractive index of the polymer network, the liquid crystal is in a transparent state, so that the transmittance is highest when the light is vertical to the film surface. When light forms a certain included angle with the film surface, the refractive index matching degree is not as good as that in the vertical direction at the angle, so that light scattering to a certain degree is caused, the transmittance of the film is reduced when the film surface is observed at the angle, and the problem of viewing angle is caused by the scattered light of the film surface. Upon removal of the electric field, the liquid crystal droplets restore the original state of astigmatism, thereby effecting a switching between the two states, since the off-state scattering ratio is high and the difference in off-state scattering ratio is insignificant.
The PDLC material can be used for preparing products such as a dimming film, intelligent dimming glass, an electronic price tag, a display and the like, and has wide application in the fields of commercial space decoration, hotel decoration, office partition, projection display, optical modulators, thermosensitive and pressure-sensitive devices, electric control glass, light valves and electronic books at present.
PDLCs have many important parameters including the photoelectric response curve, transmittance, driving voltage, adhesion, lifetime adhesion, viewing angle, etc. Among the most influential to the customer experience are transmittance and viewing angle. The good viewing angle has a great impact on the market for PDLCs.
Disclosure of Invention
The invention aims to solve the technical problem of providing a PDLC composition with a wide viewing angle, overcoming the technical defect of narrow viewing angle of the existing PDLC composition, increasing the viewing angle range of a film prepared from the PDLC composition and widening the application range of the PDLC composition.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a wide-viewing angle PDLC composition comprises the following components in percentage by weight,
35.0 to 60.0 percent of light-cured material,
35.0 to 65.0% of liquid crystal material,
0.1-5.0% of photoinitiator;
the PDLC composition also comprises a spacer which accounts for 1-3 per mill of the total weight of the PDLC composition.
The technical scheme of the invention is further improved as follows: the light-cured material comprises a light-cured prepolymer, a diluent and a reactive liquid crystal, wherein the light-cured prepolymer is one or more selected from acrylic polyurethane, acrylic polyarylate, organic silicon prepolymer and epoxy prepolymer.
The technical scheme of the invention is further improved as follows: the diluent is selected from hydroxypropyl acrylate, hydroxypropyl methacrylate, lauryl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1, 6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy acrylate, ethylphenoxy methacrylate, 3, 5-trimethylcyclohexyl acrylate, propane trimethacrylate, trimethylolpropane tri (3-mercaptopropionate), benzyl acrylate, benzyl methacrylate, hexyl acrylate, hexyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl methacrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, glycidyl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1, 6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy methacrylate, 3, 5-trimethylcyclohexyl acrylate, trimethylolpropane trimethacrylate, benzyl acrylate, benzyl methacrylate, hexyl acrylate, dicyclopentenyl methacrylate, 2,2, 2-trifluoroethyl acrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl acrylate, 2-ethyl acrylate monomer, 2,2, 2-trifluoroethyl methacrylate, acetoacetic acid ethylene glycol methacrylate, cyclohexane acrylate, cyclohexane methacrylate and one or more of dodecyl acrylate.
The technical scheme of the invention is further improved as follows: the reactive liquid crystal comprises a single-reactive functional group reactive liquid crystal material shown in a formula I and a double-reactive functional group reactive liquid crystal material shown in a formula II,
wherein,
a is selected from acrylic acid functional groupsOr methacrylic acid functional groupsOne of (a) and (b);
X1one selected from a linear alkyl chain with 0-9 carbon atoms and a linear alkoxy chain with 0-9 carbon atoms;
X2one selected from cyano, methyl, methoxy, trifluoromethyl, trifluoromethoxy, a linear alkyl chain with 2-8 carbon atoms and a linear alkoxy chain with 2-8 carbon atoms;
Y1、Y2is one of single bond, acetylene bond and ester bond;
B1、B2、B3are respectively selected from Or (2) to (d).
Preferably, the mono-reactive functional group reactive liquid crystal material shown in the formula I is a reactive liquid crystal material shown in the following formulas I1 to I8,
wherein,
a is selected from acrylic acid functional groupsOr methacrylic acid functional groupsOne of (a) and (b);
X1one selected from a linear alkyl chain with 0-9 carbon atoms and a linear alkoxy chain with 0-9 carbon atoms;
X2one selected from the group consisting of a cyano group, a methyl group, a methoxy group, a trifluoromethyl group, a trifluoromethoxy group, a linear alkyl chain having 2 to 8 carbon atoms, and a linear alkoxy chain having 2 to 8 carbon atoms.
More preferably, the mono-reactive functional group-reactive liquid crystal material represented by formula I is specifically a reactive liquid crystal material represented by the following formulae I1-1 to I8-1,
preferably, the dual-reactive functional group-reactive liquid crystal material represented by formula II is specifically a reactive liquid crystal material represented by the following formulae II 1 to II 5,
wherein,
a is selected from acrylic acid functional groupsOr methacrylic acid functional groupsOne of (a) and (b);
X1one selected from a linear alkyl chain with 0-9 carbon atoms and a linear alkoxy chain with 0-9 carbon atoms;
Y1and one of ester bond, alkyne bond, C-C single bond, CC double bond and-N-bond is selected.
Y2And one of ester bond, alkyne bond, C-C single bond, CC double bond and-N-bond is selected.
More preferably, the dual-reactive functional group-reactive liquid crystal material represented by formula II is specifically a reactive liquid crystal material represented by the following formulae II 1-1 to II 5-1,
the technical scheme of the invention is further improved as follows: the photoinitiator is selected from one of organic peroxide initiators, inorganic peroxide initiators, azo initiators and redox initiators.
The technical scheme of the invention is further improved as follows: the organic peroxide initiator is one or more selected from acyl peroxides, hydroperoxides, dialkyl peroxides, ester peroxides, ketone peroxides and dicarbonate peroxides. The acyl peroxide is selected from one or more of benzoyl peroxide and lauroyl peroxide; the hydroperoxide is selected from one or more of cumene hydroperoxide and tert-butyl hydroperoxide; the dialkyl peroxide is selected from one or more of di-tert-butyl peroxide and dicumyl peroxide; the ester peroxide is selected from one or more of tert-butyl peroxybenzoate and tert-butyl peroxyvalerate; the ketone peroxide is selected from one or more of methyl ethyl ketone peroxide and cyclohexanone peroxide; the dicarbonate peroxide is selected from one or more of diisopropyl peroxydicarbonate and dicyclohexyl peroxydicarbonate.
The technical scheme of the invention is further improved as follows: the inorganic peroxide initiator is persulfate which is selected from one or more of potassium persulfate, sodium persulfate and ammonium persulfate.
The technical scheme of the invention is further improved as follows: the azo initiator is a low-activity initiator and is selected from one or more of azobisisobutyronitrile and azobisisoheptonitrile.
The technical scheme of the invention is further improved as follows: the redox initiator is selected from one of tert-butyl hydroperoxide/sodium metabisulfite, ammonium persulfate/sodium bisulfite, potassium persulfate/sodium bisulfite, hydrogen peroxide/tartaric acid, ammonium persulfate/ferrous sulfate hydroperoxide/ferrous sulfate, benzoyl peroxide/N, N-diethylaniline, benzoyl peroxide/ferrous pyrophosphate, potassium persulfate/silver nitrate, persulfate/mercaptan, cumene hydroperoxide/ferrous chloride, potassium persulfate/ferrous chloride, hydrogen peroxide/ferrous chloride and cumene hydroperoxide/tetraethylene imine.
The technical scheme of the invention is further improved as follows: the spacers are rigid microbeads with the same diameter and the diameter of 10-30 mu m.
The liquid crystal material in the invention is a liquid crystal mixture sold on the market and a liquid crystal monomer sold on the market.
Compared with the prior art, the invention has the following advantages:
the PDLC composition with the wide viewing angle is applied to a dimming film or dimming glass as a dimming material, has excellent viewing angle characteristics, can solve the problem of reduction of film surface transmittance during side viewing of PDLC, and can improve customer experience.
Compared with the traditional PDLC film layer, the wide-viewing-angle PDLC composition uses the reactive liquid crystal material, and forms an interface layer with gradient change of refractive index at the interface of liquid crystal microdroplets and a polymer network through different reactivity of different reactive groups during UV polymerization, so that when light passes through the PDLC film from the side direction, scattering and refraction on a lateral light path are reduced, the single-reactive functional group reactive liquid crystal material shown in the formula I is used for controlling the length of a carbon chain, and the double-reactive functional group reactive liquid crystal material shown in the formula II is used for controlling the polymerization sequence.
The spacer in the PDLC composition with wide viewing angle is used for controlling the distance uniformity between two substrates of the light adjusting film.
Detailed Description
The invention discloses a wide-viewing angle PDLC composition, which comprises the following components in percentage by weight,
wherein,
the light-cured material comprises a light-cured prepolymer, a diluent and a reactive liquid crystal.
The liquid crystal material is a liquid crystal mixture sold on the market and a liquid crystal monomer sold on the market.
The photoinitiator is selected from one of organic peroxide initiator, inorganic peroxide initiator, azo initiator and redox initiator.
The spacers are rigid microbeads with the same diameter and the diameter of 10-30 mu m.
The technical solution of the present invention is further explained with reference to the following examples.
Example 1
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
49.0 percent of light-cured material,
50.0 percent of liquid crystal material,
1.0% of photoinitiator.
The components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
24.0 percent of light-cured prepolymer,
22.0 percent of diluent,
reactive liquid crystals 3.0%.
The photocurable prepolymer was selected from CN704 of Saedoma. CN704 is a monofunctional acrylic polyester, has the function of improving adhesion, and is used as a component for mainly providing polymer strength in the formula.
The diluent is hydroxypropyl acrylate.
The structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material used in this example was SL-79, a liquid crystal material from Shijia Chengninghua display materials, Inc. SL-79 has a deltan of 0.22, has higher birefringence, and is beneficial to improving the Haze level of PDLC. The main components are biphenyl cyanogen and terphenyl cyanogen liquid crystal.
The photoinitiator of this example was chosen as photoinitiator UV 184. Photoinitiator 184, chemical name 1-hydroxycyclohexyl phenyl ketone, molecular formula C25H30O3, molecular weight 378.5039, CAS registry No. 947-19-3.
In this example, the diameter of the spacer is 10um, and the spacer in the PDLC composition accounts for 1 ‰ of the total weight of the PDLC composition. The spacer material is SiO2。
Example 2
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
48.0 percent of light-cured material,
50.0 percent of liquid crystal material,
2.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
24.0 percent of light-cured prepolymer,
21.0 percent of diluent,
reactive liquid crystals 3.0%.
The photo-curing prepolymer was selected from acrylic polyurethane CN966J75NS from Saedoma. CN966J75NS is bifunctional aliphatic polyurethane acrylate polymer, has the characteristics of high strength and good toughness, and mainly provides the strength and toughness of the polymer in the formula.
The diluent is lauryl acrylate.
The structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material of this embodiment is selected from SLC1717 of shijia chengzhitong display materials ltd. The birefringence is 0.22, and the main components are biphenyl cyanogen, lipid and benzyne liquid crystal. The Haze is high when the coating is applied to the formula.
The photoinitiator of this example was chosen as photoinitiator UV 184. The chemical name is 1-hydroxycyclohexyl phenyl ketone, the molecular formula is C25H30O3, the molecular weight is 378.5039, the CAS registry number is 947-19-3, and one of common photocatalyst and auxiliary agent.
In this example, the diameter of the spacer is 15um, and the spacer in the PDLC composition accounts for 2% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 3
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
44.0 percent of light-cured material,
55.0 percent of liquid crystal material,
1.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
17.0 percent of light-cured prepolymer,
21.0 percent of diluent,
reactive liquid crystals 4.0%.
The light-curing prepolymer is acrylic polyurethane UV65 from Shanghai Korea company Limited. UV65 has the characteristics of high strength and good toughness, and the strength and the toughness of the polymer are mainly provided in the formula.
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material SL-16 of Shijia Chengniangong-Hua display materials, Inc. was selected as the liquid crystal material in this example.
The photoinitiator of this example was selected as the photoinitiator TPO. Chemical name: english name of 2,4,6, -trimethylbenzoyl-diphenylphosphinophosphorus oxide: 2,4, 6-trimethylbenzoylphosphinyloxy CASNO: 75980-60-8 molecular formula C22H21PO2 molecular weight: 348.5. TPO is a highly efficient photoinitiator that is highly efficient in radical (1) type light and absorbs in the long wavelength range. The photo-bleaching agent has the characteristics of wide absorption range, effective absorption peak value of 350-400nm, absorption of about 420nm, longer absorption peak than that of a conventional initiator, capability of generating two free radicals of benzoyl and phosphoryl after illumination and capability of initiating polymerization, high photo-curing speed, photobleaching effect, suitability for deep curing of thick films and no yellowing of coatings, low volatility and suitability for water base.
In this example, the diameter of the spacer is 15um, and the spacer in the PDLC composition accounts for 2% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 4
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
44.0 percent of light-cured material,
54.5 percent of liquid crystal material,
1.5% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
19.0 percent of light-cured prepolymer,
22.0 percent of diluent,
reactive liquid crystals 3.0%.
The photo-curing prepolymer is selected from polyarylate acrylate CN970A80 of Saedoma company. CN970A80 has the characteristics of high strength and good toughness, and the strength and the toughness of the polymer are mainly provided in the formula
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material of this example was selected from RQ-002, a liquid crystal material from Shijia Chengning Yonghua display materials, Inc. The main components are lipid cyanogen and biphenyl cyanogen liquid crystal. The birefringence n is 0.2. The formula has good solubility and phase separation property after polymerization.
The photoinitiator of this example was selected as photoinitiator UV 651. The UV651(1065) photoinitiator is also called benzil dimethyl ether, has the chemical name of a, a-dimethoxy-a-phenylacetophenone, is DMPA for short, and has the structural formula of C6H5COC (OCH3)2C6H5 and the molecular weight of 256.30. White or light yellow crystals, relative density 1.1278. The melting point is 64-67 ℃. Dissolving in organic solvent such as acetone, ethyl acetate, isopropanol, hot methanol, etc., and dissolving in water. It is stable in alkaline and sensitive to light. Low toxicity. The maximum absorption wavelength is 337nm, the material is suitable for systems of unsaturated polyester/styrene, acrylate, siloxane and the like, the thermal stability is very good, the quenching resistance and the photoinitiator activity are higher, and the yellowing ratio is serious.
The diameter of the spacer in this example is 20um, and the spacer in the PDLC composition accounts for 3% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 5
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
47.0 percent of light-cured material,
51.0 percent of liquid crystal material,
2.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
20.0 percent of light-cured prepolymer,
24.0 percent of diluent,
reactive liquid crystals 3.0%.
The photo-curing prepolymer was selected from polyarylate acrylate CN9782 from sartomer. CN9782 is an aromatic polyester with a high refractive index, and in the present formulation, mainly provides structural strength of the polymer network.
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material used in this example was selected from liquid crystal material 099316 of Shijiacheng Yonghua display materials, Inc. 099316 is composed of lipid liquid crystal, biphenyl cyanide liquid crystal, fluorine liquid crystal, and solvent liquid crystal. Since its birefringence is 0.169, it exhibits a better viewing angle in the PDLC liquid crystal.
The photoinitiator of this example was chosen for the photoinitiator ITX. Chemical name: 2 isopropyl thioxanthone, ITX is a highly efficient photoinitiator for transparent or colored UV-curable screen inks, reprographic varnishes, lithographic inks, flexographic inks, electronics, wood coatings, adhesives, and photoresists.
In this example, the diameter of the spacer is 25um, and the spacer in the PDLC composition accounts for 2% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 6
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
50.0 percent of light-cured material,
47.5 percent of liquid crystal material,
2.5% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
24.0 percent of light-cured prepolymer,
23.0 percent of diluent,
reactive liquid crystals 3.0%.
The photo-curing prepolymer was selected from polyarylate acrylate CN975 from sartomer. CN975 is an aromatic polyester with a high refractive index, which in the present formulation provides primarily structural strength to the polymer network
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material of this example was selected from liquid crystal material I71-004 from Shijiacheng Yonghua display materials, Inc. I71-004 was a high birefringence liquid crystal with a deltan of 0.24, which had good Haze in this formulation. The main components are fluorine cyanide liquid crystal and alkyne liquid crystal.
The photoinitiator of this example was chosen for the photoinitiator ITX. Chemical name: 2 Isopropylthioxanthone, ITX is a highly efficient photoinitiator for transparent or colored UV-curable screen inks, overprint varnishes, lithographic inks, flexographic inks, electronic products, wood coatings, adhesives, and photoresists
In this example, the diameter of the spacer is 25um, and the spacer in the PDLC composition accounts for 3% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 7
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
53.0 percent of light-cured material,
44.0 percent of liquid crystal material,
3.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
30.0 percent of light-cured prepolymer,
20.0 percent of diluent,
reactive liquid crystals 3.0%.
The photo-curing prepolymer is selected from polyarylate acrylate CN970A80 of Saedoma company. It is an aromatic polyester with a high refractive index, which in the present formulation mainly provides structural strength to the polymer network
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material of this example was selected from liquid crystal material I71-004 from Shijiacheng Yonghua display materials, Inc. I71-004 was a high birefringence liquid crystal with a deltan of 0.24, which had good Haze in this formulation. The main components are fluorine cyanide liquid crystal and alkyne liquid crystal.
The photoinitiator of this example was selected from the photoinitiator cyclohexanone peroxide. The molecular formula is C12H22O5C5H10C (OOH) OOC (OH) C5H 10. The english name cyclohexenone.
In this example, the diameter of the spacer is 30um, and the spacer in the PDLC composition accounts for 3% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 8
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
57.0 percent of light-cured material,
40.0 percent of liquid crystal material,
3.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
27.0 percent of light-cured prepolymer,
25.0 percent of diluent,
5.0% of reactive liquid crystal.
The light-curing prepolymer is selected from organosilicon prepolymer.
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material of this example is selected from SLC9012 of shijia chengzhitong display materials ltd. SLC9012 is mainly a cyano liquid crystal.
The photoinitiator in this example was chosen from the photoinitiator azobisisobutyronitrile. English name: 2,2' -Azobis (2-methylpropionitrile). CAS number: 78-67-1. Azodiisobutyronitrile is an oil-soluble azo initiator, and the azo initiator has stable reaction, is a first-order reaction, has no side reaction and is well controlled, so the azodiisobutyronitrile is widely applied to the research and production of macromolecules. Such as vinyl chloride, vinyl acetate, acrylonitrile, and the like, and also as a blowing agent for polyvinyl chloride, polyolefin, polyurethane, polyvinyl alcohol, acrylonitrile-butadiene-styrene copolymer, polyisocyanate, polyvinyl acetate, polyamide, polyester, and the like.
In this example, the diameter of the spacer is 30um, and the spacer in the PDLC composition accounts for 3% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 9
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
62.0 percent of light-cured material,
35.0 percent of liquid crystal material,
3.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
25.0 percent of light-cured prepolymer,
32.0 percent of diluent,
5.0% of reactive liquid crystal.
The light-curing prepolymer is epoxy prepolymer.
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material of this embodiment is selected from SLC1717 of shijia chengzhitong display materials ltd. The birefringence is 0.22, and the main components are biphenyl cyanogen, lipid and benzyne liquid crystal. The Haze is high when the coating is applied to the formula.
The photoinitiator in this example was cumene hydroperoxide/ferrous chloride.
In this example, the diameter of the spacer is 30um, and the spacer in the PDLC composition accounts for 2% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 10
In this embodiment, the components and weight percentages of the PDLC composition with a wide viewing angle are as follows:
62.0 percent of light-cured material,
35.0 percent of liquid crystal material,
3.0% of a photoinitiator;
the components of the light-cured material of the embodiment and the weight percentage of the components in the PDLC composition are as follows:
25.0 percent of light-cured prepolymer,
34.0 percent of diluent,
reactive liquid crystals 3.0%.
The light-curing prepolymer is epoxy prepolymer.
The components of the diluent and the weight percentage of the components in the PDLC composition are as follows:
the structural formula of the reactive liquid crystal and the weight percentage of the reactive liquid crystal in the PDLC composition are as follows:
the liquid crystal material used in this example was SL-79, a liquid crystal material from Shijia Chengninghua display materials, Inc. SL-79 has a deltan of 0.22, has higher birefringence, and is beneficial to improving the Haze level of PDLC. The main components are biphenyl cyanogen and terphenyl cyanogen liquid crystal.
The photoinitiator of this example was chosen for the photoinitiator lauroyl peroxide. English name: lauroylperoxide. Used as high molecular polymerization initiator and foaming agent.
In this example, the diameter of the spacer is 40um, and the spacer in the PDLC composition accounts for 2% of the total weight of the PDLC composition. The spacer material is SiO2。
Example 11
PDLC light modulation films Film-1 to Film-10 are prepared.
1) Spreading the base material on a coating table, setting the speed of a coating machine to be 20mm/s, dripping the PDLC composition with wide visual angle prepared in the above examples 1-10 on a coating head, starting a start button, and coating to obtain a membrane;
2) placing the membrane in an ultraviolet curing machine with the concentration of 0.5-2.5 mW/cm2Curing for 2min to obtain PDLC light modulation films Film-1-Film-10.
PDLC dimming film performance detection conditions:
haze: WGT-S transmittance/haze tester;
the haze was measured at 45 ° to the light path. The driving voltage is unified to 110V.
The Film films Film-1 to Film-10 of the PDLC light modulation Film obtained in example 11 showed performance test results in table 1, and Film-11 was a commercially available product.
TABLE 1 Film-1 to Film-11 Performance test results
As described above, the PDLC light control film produced by using the wide viewing angle PDLC composition of the present invention as a light control material has an improved viewing angle. The PDLC light-adjusting film of the present invention is excellent in viewing angle characteristics as compared with the conventional PDLC light-adjusting film on the market, and such effects cannot be expected by those skilled in the art.
Although the present invention has been described in connection with the preferred embodiments, it is not limited to the above-described embodiments, and it is to be understood that various modifications and improvements can be made by those skilled in the art within the spirit of the present invention, and the scope of the present invention is outlined by the appended claims.

Claims (10)

1. A wide viewing angle PDLC composition, characterized by: the PDLC composition comprises the following components in percentage by weight,
35.0 to 60.0 percent of light-cured material,
35.0 to 65.0% of liquid crystal material,
0.1-5.0% of photoinitiator;
the PDLC composition also comprises a spacer which accounts for 1-3 per mill of the total weight of the PDLC composition.
2. The wide-viewing angle PDLC composition of claim 1, wherein: the light-cured material comprises a light-cured prepolymer, a diluent and a reactive liquid crystal; the light-cured prepolymer is one or more selected from polyurethane acrylate, polyarylate acrylate, organosilicon prepolymer and epoxy prepolymer.
3. The wide-viewing angle PDLC composition of claim 2, wherein: the diluent is selected from hydroxypropyl acrylate, hydroxypropyl methacrylate, lauryl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1, 6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy acrylate, ethylphenoxy methacrylate, 3, 5-trimethylcyclohexyl acrylate, propane trimethacrylate, trimethylolpropane tri (3-mercaptopropionate), benzyl acrylate, benzyl methacrylate, hexyl acrylate, hexyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl methacrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, glycidyl acrylate, lauryl methacrylate, 3-chloro-2-hydroxy-methacrylate, isobornyl acrylate, isobornyl methacrylate, 1, 6-hexanediol diacrylate, ethoxylated trimethylolpropane triacrylate, ethylphenoxy methacrylate, 3, 5-trimethylcyclohexyl acrylate, trimethylolpropane trimethacrylate, benzyl acrylate, benzyl methacrylate, hexyl acrylate, dicyclopentenyl methacrylate, 2,2, 2-trifluoroethyl acrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl acrylate, 2-ethyl acrylate monomer, 2,2, 2-trifluoroethyl methacrylate, acetoacetic acid ethylene glycol methacrylate, cyclohexane acrylate, cyclohexane methacrylate and one or more of dodecyl acrylate.
4. The wide-viewing angle PDLC composition of claim 2, wherein: the reactive liquid crystal comprises a single-reactive functional group reactive liquid crystal material shown in a formula I and a double-reactive functional group reactive liquid crystal material shown in a formula II,
wherein,
a is selected from acrylic acid functional groupsOr methacrylic acid functional groupsOne of (a) and (b);
X1one selected from a linear alkyl chain with 0-9 carbon atoms and a linear alkoxy chain with 0-9 carbon atoms;
X2one selected from cyano, methyl, methoxy, trifluoromethyl, trifluoromethoxy, a linear alkyl chain with 2-8 carbon atoms and a linear alkoxy chain with 2-8 carbon atoms;
Y1、Y2is one of single bond, acetylene bond and ester bond;
B1、B2、B3are respectively selected from Or (2) to (d).
5. The wide-viewing angle PDLC composition of claim 1, wherein: the photoinitiator is selected from one of organic peroxide initiators, inorganic peroxide initiators, azo initiators and redox initiators.
6. The wide-viewing angle PDLC composition of claim 5, wherein: the organic peroxide initiator is selected from one or more of acyl peroxide, hydroperoxide, dialkyl peroxide, ester peroxide, ketone peroxide and dicarbonate peroxide; the acyl peroxide is selected from one or more of benzoyl peroxide and lauroyl peroxide; the hydroperoxide is selected from one or more of cumene hydroperoxide and tert-butyl hydroperoxide; the dialkyl peroxide is selected from one or more of di-tert-butyl peroxide and dicumyl peroxide; the ester peroxide is selected from one or more of tert-butyl peroxybenzoate and tert-butyl peroxyvalerate; the ketone peroxide is selected from one or more of methyl ethyl ketone peroxide and cyclohexanone peroxide; the dicarbonate peroxide is selected from one or more of diisopropyl peroxydicarbonate and dicyclohexyl peroxydicarbonate.
7. The wide-viewing angle PDLC composition of claim 5, wherein: the inorganic peroxide initiator is persulfate which is selected from one or more of potassium persulfate, sodium persulfate and ammonium persulfate.
8. The wide-viewing angle PDLC composition of claim 5, wherein: the azo initiator is a low-activity initiator and is selected from one or more of azobisisobutyronitrile and azobisisoheptonitrile.
9. The wide-viewing angle PDLC composition of claim 5, wherein: the redox initiator is selected from one of tert-butyl hydroperoxide/sodium metabisulfite, ammonium persulfate/sodium bisulfite, potassium persulfate/sodium bisulfite, hydrogen peroxide/tartaric acid, ammonium persulfate/ferrous sulfate hydroperoxide/ferrous sulfate, benzoyl peroxide/N, N-diethylaniline, benzoyl peroxide/ferrous pyrophosphate, potassium persulfate/silver nitrate, persulfate/mercaptan, cumene hydroperoxide/ferrous chloride, potassium persulfate/ferrous chloride, hydrogen peroxide/ferrous chloride and cumene hydroperoxide/tetraethylene imine.
10. The wide-viewing angle PDLC composition of claim 1, wherein: the spacers are rigid microbeads with the same diameter and the diameter of 10-30 mu m.
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CN113568212A (en) * 2021-07-26 2021-10-29 国信宝威(北京)科技有限公司 Low-haze high-bonding-force light modulation film and preparation method thereof
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CN112987378A (en) * 2021-03-26 2021-06-18 国信宝威(北京)科技有限公司 Reverse light modulation film and preparation method thereof
CN113568212A (en) * 2021-07-26 2021-10-29 国信宝威(北京)科技有限公司 Low-haze high-bonding-force light modulation film and preparation method thereof
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