CN112175635A - Polymer stable alignment type liquid crystal composition and application thereof - Google Patents

Polymer stable alignment type liquid crystal composition and application thereof Download PDF

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Publication number
CN112175635A
CN112175635A CN202011010608.4A CN202011010608A CN112175635A CN 112175635 A CN112175635 A CN 112175635A CN 202011010608 A CN202011010608 A CN 202011010608A CN 112175635 A CN112175635 A CN 112175635A
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compound represented
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liquid crystal
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crystal material
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李承贺
郭云鹏
陈卯先
刘友然
任婕
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Beijing Bayi Space LCD Technology Co Ltd
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Beijing Bayi Space LCD Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/56—Aligning agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • 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
    • C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
    • C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133703—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by introducing organic surfactant additives into the liquid crystal material

Abstract

The invention relates to the technical field of liquid crystal materials, in particular to a polymer stable alignment type liquid crystal composition and application thereof. The polymer stable alignment type liquid crystal composition comprises at least one polymerizable compound represented by a general formula I, a nematic phase liquid crystal material and a self-alignment additive; the invention aims to provide a polymer stable alignment type liquid crystal composition, which realizes alignment of liquid crystal molecules by adopting a mode of a polymerizable compound + a nematic phase liquid crystal material + a (vertical alignment) self-alignment additive, and omits a traditional polyimide alignment film and a preparation method thereof, thereby achieving the effects of saving cost, simplifying process and improving panel quality.

Description

Polymer stable alignment type liquid crystal composition and application thereof
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a polymer stable alignment type liquid crystal composition and application thereof.
Background
In recent years, liquid crystal display devices have been widely used in various electronic devices, such as smart phones, tablet computers, car navigators, televisions, and the like. Representative liquid crystal display modes include a Twisted Nematic (TN) mode, a Super Twisted Nematic (STN) mode, an in-plane switching (IPS) mode, a Fringe Field Switching (FFS) mode, and a Vertical Alignment (VA) mode. Among them, the VA mode receives increasing attention because of having a fast fall time, a high contrast ratio, a wide viewing angle, and a high quality image.
However, the liquid crystal medium used for the display element of the active matrix addressing type such as VA mode has its own disadvantages, such as a significantly inferior image sticking level to that of the display element of positive dielectric anisotropy, a relatively slow response time, a relatively high driving voltage, and the like.
A PSVA (polymer stabilized vertically aligned liquid crystal) type liquid crystal display element forms a polymer structure in a liquid crystal cell to control a pretilt angle structure of liquid crystal molecules, and is used as a liquid crystal display element due to its high-speed response and high contrast. The PSVA type display element is manufactured by injecting a polymerizable composition containing a liquid crystal compound and a polymerizable compound between substrates, irradiating with ultraviolet light, and polymerizing the polymerizable compound in a state in which liquid crystal molecules are aligned. The polymerizable compound as the main material has important significance, and the polymerizable compound is matched with a proper liquid crystal composition, so that the response speed can be effectively improved, the contrast ratio can be improved, the problem of display residual image can be solved, and the like.
Under the layer formed by the phase separated and polymerized RM (which introduces the pretilt angle described above), PSVA displays typically comprise an alignment layer, usually polyimide, which provides initial alignment of the LC molecules, followed by a polymer stabilization step. The use of alignment layers has the advantage of better control of the orientation of the liquid crystal molecules, but polyimide as an alignment layer material has disadvantages: the price of the polyimide material is expensive, the film forming process of the polyimide is complex in the manufacturing process of the liquid crystal display device, and the manufacturing cost of a machine table matched with the polyimide material is high; in addition, polyimide itself has high water absorption, and a lot of friction fragments remain in the friction process, which all affect the display, generate stains and uneven display, and further affect the reliability of the display device.
In addition, the interaction between the liquid crystal compound and the polyimide alignment layer, if not well matched, will generally result in a decrease in the resistance of the display. The number of available liquid crystal compounds that are suitable for this purpose is therefore significantly reduced, and some display parameters such as viewing angle dependence, contrast and response time have to be sacrificed for matching uniformity to meet the liquid crystal compounds and polyimide alignment layers. Therefore, it is desirable to remove the polyimide alignment layer.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a polymer stable alignment type liquid crystal composition, which realizes alignment of liquid crystal molecules by adopting a mode of a polymerizable compound + a nematic phase liquid crystal material + a (vertical alignment) self-alignment additive, and omits a traditional polyimide alignment film and a preparation method thereof, thereby achieving the effects of saving cost, simplifying process and improving panel quality.
Specifically, the polymer stable alignment type liquid crystal composition comprises at least one of polymerizable compounds represented by a general formula I, a nematic phase liquid crystal material and a self-alignment additive:
Figure BDA0002697435100000011
wherein L is1、L2、L3、L4、L5、L6Each independently represents H, -F, -Cl, -CH3、-C2H5、-OCH3、-OC2H5、-CF3Or OCF3And L is3、L4Not both being H and L1、L2、L5、L6At least one of them is-CH3or-OCH3；
P1、P2Each independently represents an acrylate group, a methacrylate group, fluorineAcrylate, chloroacrylate, vinyloxy, oxetane or epoxy groups;
Z1、Z2each independently represents a single bond, -O-, -S-, -CO-O-, -O-CO-O-, -CH-N-, -N-CH-, -N-, or C1-C12Alkylene or C2-C12Alkenyl of (a); or, said C1-C12Alkylene or C2-C12At least one hydrogen atom in the alkenyl group of (a) is substituted with F, Cl or CN; or, said C1-C12Alkylene or C2-C12One of alkenyl groups of (2) -CH2-or at least two non-adjacent-CHs2-substituted by-O-, -S-, -NH-, -CO-, COO-, -OCO-, -OCOO-, -SCO-, -COs-or-C ═ C-in a manner not directly linked to each other;
the nematic liquid crystal material comprises at least one of the compounds represented by the general formula II, at least one of the compounds represented by the general formula III:
Figure BDA0002697435100000021
wherein, in the general formula II, R1、R2Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the1、A2Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene; z3Represents a single bond, -CH2CH2-or-CH2O-; a is 0 or 1;
in the general formula III, R3、R4Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the3、A4Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
the self-aligning additive includes at least one of the compounds represented by formula V:
Figure BDA0002697435100000022
wherein L is7Represents H, -F, -Cl, -CH3、-C2H5、-OCH3、-OC2H5、-CF3or-OCF3；
P3、P4Each independently represents an acrylate group, a methacrylate group, a fluoroacrylate group, a chloroacrylate group, a vinyloxy group, an oxetane group or an epoxy group;
R7、R8、R9、R10、R11each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12Linear alkenyl groups of (a).
Compared with the existing liquid crystal composition, the polymerizable compound in the liquid crystal composition provided by the invention has the advantages of higher polymerization rate, small pretilt angle variation, high conversion rate, low residue and the like.
Preferably, in the formula I, L represents1、L2、L3、L4、L5、L6Each independently represents H, -F, -CH3or-OCH3And L is3、L4Not H at the same time;
P1、P2each independently represents an acrylate group, a methacrylate group, a fluoroacrylate group, or a chloroacrylate group;
Z1、Z2each independently represents a single bond, -O-, -S-, -CO-O-, -O-CO-, C1-C6Alkylene or C2-C6Alkenyl of (a); or, said C1-C6Alkylene or C2-C6At least one hydrogen atom in the alkenyl group of (a) is substituted by F; or, said C1-C6Alkylene or C2-C6One of alkenyl groups of (2) -CH2-or toAt least two non-adjacent-CH2-is substituted by-O-in a manner not directly linked to each other;
preferably, the compound represented by the general formula I is selected from one or more of the formulas I-1 to I-28:
Figure BDA0002697435100000031
Figure BDA0002697435100000041
Figure BDA0002697435100000051
more preferably, the compound represented by the general formula I is selected from one or more of the formulas I-1 to I-5 and I-18.
Preferably, in the formula I, P is1、P2Each independently represents an acrylate group or a methacrylate group;
Z1、Z2each independently represents a single bond, -O-, C1-C6Alkylene or C1-C6Alkoxy group of (2).
Preferably, the compound represented by formula II is selected from one or more of formulae IIA to IIF:
Figure BDA0002697435100000052
preferably, the compound represented by formula II is selected from one or more of formulae IIA-1 to IIF-16:
Figure BDA0002697435100000053
Figure BDA0002697435100000061
Figure BDA0002697435100000071
Figure BDA0002697435100000081
Figure BDA0002697435100000091
Figure BDA0002697435100000101
more preferably, the compound represented by the general formula II is selected from one or more of the compounds of the formulas IIA-9-IIA-24, IIB-19-IIB-38, IIC-9-IIC-24, IID-9-IID-24, IIE-1-IIE-20 and IIF-1-IIF-16;
most preferably, the compound represented by formula II is selected from one or more of the group consisting of formula IIA-13 to IIA-24, IIB-23 to IIB-38, IIC-13 to IIC-24, IID-13 to IID-24, IIE-1, IIE-2, IIE-5, IIE-6, IIE-9, IIE-10, IIE-13, IIE-14, IIE-17, IIE-18, IIF-1, IIF-2, IIF-5, IIF-6, IIF-9, IIF-10, IIF-13 and IIF-14.
Preferably, the compound represented by the general formula III is selected from one or more of formulae IIIA to IIIC:
Figure BDA0002697435100000102
preferably, the compound represented by formula III is selected from one or more of formulae IIIA-1 to IIIC-24:
Figure BDA0002697435100000103
Figure BDA0002697435100000111
Figure BDA0002697435100000121
Figure BDA0002697435100000131
more preferably, the compound represented by the general formula III is selected from one or more of the compounds in the formulas IIIA-1 to IIIA-24, IIIB-1 to IIIB-24 and IIIC-1 to IIIC-22;
most preferably, the compound represented by the general formula III is selected from one or more of the following formulas IIIA-1 to IIIA-12, IIIB-17 to IIIB-24, IIIC-1 to IIIC-4 and IIIC-15 to IIIC-18.
As a preferable aspect of the above-described embodiment, the nematic liquid crystal material further includes at least one of compounds represented by general formula IV:
Figure BDA0002697435100000132
wherein R is5、R6Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the5Represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
preferably, the compound represented by formula IV is selected from one or more of formulae IVA to IVB:
Figure BDA0002697435100000133
wherein R is5、R6Each independently represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C2～C7A linear alkenyl group of (a);
more preferably, the compound represented by formula IV is selected from one or more of formulas IVA-1 to IVB-63:
Figure BDA0002697435100000134
Figure BDA0002697435100000141
Figure BDA0002697435100000151
Figure BDA0002697435100000161
Figure BDA0002697435100000171
most preferably, the compound represented by formula IV is selected from one or more of formulas IVA-39 to IVA-44, IVB-39 to IVB-48.
Preferably, in the formula V, P is3、P4Each independently represents an acrylate group, a methacrylate group, a fluoroacrylate group, or a chloroacrylate group;
R7、R8、R9、R10、R11each independently represents C1～C5Straight chain alkyl group of (1), C1～C5Linear alkoxy of (5) or C2～C5A linear alkenyl group of (a);
preferably, the compound represented by formula V is selected from one or more of formulas V-1 to V-24:
Figure BDA0002697435100000172
Figure BDA0002697435100000181
Figure BDA0002697435100000191
Figure BDA0002697435100000201
more preferably, the compound represented by formula V is selected from one or more of the formulas V-8, V-12, V-16, V-24. Preferably, in the formula V, P is3、P4Each independently represents an acrylate group or a methacrylate group.
As a preference of the above technical solution, the polymer stable alignment type liquid crystal composition further comprises an antioxidant; the antioxidant comprises at least one of the compounds represented by formula VI:
Figure BDA0002697435100000211
wherein R is12Represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C2～C7A linear alkenyl group of (a); a. the6Represents trans-1, 4-cyclohexyl or 1, 4-phenylene; b is 0 or 1;
preferably, the compound represented by formula VI is selected from one or more of the group consisting of formula VI-1 to formula VI-2:
Figure BDA0002697435100000212
in order to enable the liquid crystal composition to meet different requirements, the nematic phase liquid crystal material comprises the following components in percentage by weight:
preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 1-80% of a compound represented by the general formula II;
(2) 1 to 70% of a compound represented by the general formula III;
(3) 0 to 40% of a compound represented by the general formula IV;
preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 5-70% of a compound represented by the general formula II;
(2) 20-60% of a compound represented by the general formula III;
(3) 0 to 35% of a compound represented by the general formula IV;
more preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 10-70% of a compound represented by the general formula II;
(2) 25 to 60% of a compound represented by the general formula III;
(3) 0 to 30% of a compound represented by the general formula IV;
most preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 20-70% of a compound represented by the general formula II;
(2) 25 to 50% of a compound represented by the general formula III;
(3) 0 to 20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 0-8% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
preferably, the nematic liquid crystal material is 100% by weight.
In the liquid crystal composition provided by the invention, the compound represented by the general formula I and the compound represented by the general formula V are independently added outside the nematic phase liquid crystal material in percentage by weight, and the specific contents are as follows:
preferably, the amount of the compound represented by the general formula I is 0.01-5% of the mass of the nematic liquid crystal material; preferably 0.05-1%; more preferably 0.1 to 0.5%; most preferably 0.15-0.32%;
preferably, the amount of the compound represented by the general formula V is 0.01-5% of the mass of the nematic liquid crystal material; preferably 0.1-5%; more preferably 0.2-2%;
preferably, the amount of the compound represented by the general formula VI is 0 to 0.05% by mass of the nematic liquid crystal material.
The method for preparing the liquid crystal composition of the present invention is not particularly limited, and two or more compounds may be mixed and produced by a conventional method, for example, by mixing the different components at a high temperature and dissolving each other.
The invention also provides the application of the polymer stable alignment type liquid crystal composition in a liquid crystal display device; preferably in a liquid crystal display device of the SAVA type.
The latest display mode is realized by adding a self-alignment agent or an additive into a liquid crystal medium, and removing an alignment layer on a substrate by adding the self-alignment additive to obtain the expected alignment; the above display mode is referred to as an SA (self-alignment) display mode. The research of the invention finds that if the self-alignment additive contains a group with polymerizable property (such as methacrylate), the self-alignment additive can be polymerized with polymerizable monomers in PSVA liquid crystal under the irradiation of ultraviolet light to form a polymer layer similar to a polyimide alignment film, so as to replace the function of the alignment layer, provide the required initial angle for liquid crystal molecules and achieve the purpose of improving the reliability of the panel.
For example, in the SAVA type liquid crystal display device, the addition of the self-alignment additive can allow the alignment layer on the substrate to be removed, and the difficulty of the process is reduced, so that the cost is reduced; the polymerizable group (such as methacrylate) contained in the self-alignment additive is polymerized with polymerizable monomers in PSVA liquid crystal under the irradiation of ultraviolet light to form a polymer layer similar to a polyimide alignment film, so that the function of the alignment layer is replaced, the required initial angle is given to liquid crystal molecules, and the purpose of improving the reliability of the panel can be achieved.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Unless otherwise indicated, percentages in the present invention are weight percentages; the temperature units are centigrade; Δ n represents optical anisotropy (25 ℃);∥and⊥respectively represent the parallel and perpendicular dielectric constants (25 ℃, 1000 Hz); Δ represents the dielectric anisotropy (25 ℃, 1000 Hz); γ 1 represents rotational viscosity (mpa.s, 25 ℃); cp represents the clearing point (. degree. C.) of the liquid crystal composition; k11、K22、K33Respectively represent the splay, twist and bend elastic constants (pN, 25 ℃); ρ represents resistivity (Ω · cm) and the test conditions are 25 ± 2 ℃.
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 1.
Table 1: radical structure code of liquid crystal compound
Figure BDA0002697435100000231
Figure BDA0002697435100000241
Take the following compound structure as an example:
Figure BDA0002697435100000242
expressed as: 3PWO2
Figure BDA0002697435100000243
Expressed as: 3CCWO2
In the following examples, the liquid crystal composition was prepared by a thermal dissolution method, comprising the steps of: weighing the liquid crystal compound by a balance according to the weight percentage, wherein the weighing and adding sequence has no specific requirements, generally weighing and mixing the liquid crystal compound in sequence from high melting point to low melting point, heating and stirring at 60-100 ℃ to uniformly melt all the components, filtering, performing rotary evaporation, and finally packaging to obtain the target sample.
The weight percentages and performance parameters of the individual components of the nematic liquid-crystal material are given in the following table.
Nematic liquid crystal material LC1
Table 2: weight percentage of each component in nematic liquid crystal material LC1 and performance parameters
Figure BDA0002697435100000244
Nematic liquid crystal material LC2
Table 3: weight percentage of each component in nematic liquid crystal material LC2 and performance parameters
Figure BDA0002697435100000245
Figure BDA0002697435100000251
Nematic liquid crystal material LC3
Table 4: weight percentage of each component in nematic liquid crystal material LC3 and performance parameters
Figure BDA0002697435100000252
Nematic liquid crystal material LC4
Table 5: weight percentage of each component in nematic liquid crystal material LC4 and performance parameters
Figure BDA0002697435100000253
Nematic liquid crystal material LC5
Table 6: weight percentage of each component in nematic liquid crystal material LC5 and performance parameters
Figure BDA0002697435100000254
Figure BDA0002697435100000261
Nematic liquid crystal material LC6
Table 7: weight percentage of each component in nematic liquid crystal material LC6 and performance parameters
Figure BDA0002697435100000262
Nematic liquid crystal material LC7
Table 8: weight percentage of each component in nematic liquid crystal material LC7 and performance parameters
Figure BDA0002697435100000263
Nematic liquid crystal material LC8
Table 9: weight percentage of each component in nematic liquid crystal material LC8 and performance parameters
Figure BDA0002697435100000264
Figure BDA0002697435100000271
Nematic liquid crystal material LC9
Table 10: weight percentage of each component in nematic liquid crystal material LC9 and performance parameters
Figure BDA0002697435100000272
Nematic liquid crystal material LC10
Table 11: weight percentage of each component in nematic liquid crystal material LC10 and performance parameters
Figure BDA0002697435100000273
Nematic liquid crystal material LC11
Table 12: weight percentage of each component in nematic liquid crystal material LC11 and performance parameters
Figure BDA0002697435100000274
Figure BDA0002697435100000281
Nematic liquid crystal material LC12
Table 13: weight percentage of each component in nematic liquid crystal material LC12 and performance parameters
Figure BDA0002697435100000282
Nematic liquid crystal material LC13
Table 14: weight percentage of each component in nematic liquid crystal material LC13 and performance parameters
Figure BDA0002697435100000283
Nematic liquid crystal material LC14
Table 15: weight percentage of each component in nematic liquid crystal material LC14 and performance parameters
Figure BDA0002697435100000284
Figure BDA0002697435100000291
Nematic liquid crystal material LC15
Table 16: weight percentage of each component in nematic liquid crystal material LC15 and performance parameters
Figure BDA0002697435100000292
Nematic liquid crystal material LC16
Table 17: weight percentage of each component in nematic liquid crystal material LC16 and performance parameters
Figure BDA0002697435100000293
Nematic liquid crystal material LC17
Table 18: weight percentage of each component in nematic liquid crystal material LC17 and performance parameters
Figure BDA0002697435100000301
Nematic liquid crystal material LC18
Table 19: weight percentage of each component in nematic liquid crystal material LC18 and performance parameters
Figure BDA0002697435100000302
Nematic liquid crystal material LC19
Table 20: weight percentage of each component in nematic liquid crystal material LC19 and performance parameters
Figure BDA0002697435100000303
Nematic liquid crystal material LC20
Table 21: weight percentage of each component in nematic liquid crystal material LC20 and performance parameters
Figure BDA0002697435100000304
Figure BDA0002697435100000311
Nematic liquid crystal material LC21
Table 22: weight percentage of each component in nematic liquid crystal material LC21 and performance parameters
Figure BDA0002697435100000312
Nematic liquid crystal material LC22
Table 23: weight percentage of each component in nematic liquid crystal material LC22 and performance parameters
Figure BDA0002697435100000313
Nematic liquid crystal material LC23
Table 24: weight percentage of each component in nematic liquid crystal material LC23 and performance parameters
Figure BDA0002697435100000314
Figure BDA0002697435100000321
In the following examples, the compound represented by formula I, the compound represented by formula V, and the compound represented by formula VI are added separately in addition to the nematic liquid crystal material in mass percent.
Examples are shown in Table 25
TABLE 25
Figure BDA0002697435100000322
Figure BDA0002697435100000331
The liquid crystal composition containing the self-aligning additive and the polymerizable compound was injected by vacuum injection into a "non-aligned" cell with a thickness of d-3.2 μm, an ITO coating on both sides (structured ITO in case of multi-domain switching), no alignment layer and no passivation layer.
Then, the liquid crystal cell was irradiated with ultraviolet rays using a fluorescent lamp through a color filter that filters ultraviolet rays of 310nm or less. At this time, the illuminance measured under the condition that the central wavelength was 365nm was adjusted to 100mW/cm2Irradiation cumulative light quantity of 30J/cm2Ultraviolet rays (irradiation condition 1); subsequently, the illuminance measured under the condition of a central wavelength of 313nm was adjusted to 3mW/cm using a fluorescent UV lamp2Cumulative quantity of light irradiated 10J/cm2(ultraviolet irradiation condition 2). UV1 is an ultraviolet irradiation process through irradiation condition 1, and UV2 is a process through irradiation condition 1 and irradiation condition 2.
Comparative example 1
A liquid crystal composition containing a polymerizable compound was obtained as comparative example 1 by adding 0.265 parts by mass of the compound represented by the formula RM-1 and 0.05 parts by mass of the compound represented by the formula V-2 to 100 parts by mass of nematic liquid crystal material LC 1.
Figure BDA0002697435100000332
A liquid crystal composition containing a polymerizable compound was injected into a PSVA test cell having a cell gap of 3.2 μm by a vacuum injection method. Then, the liquid crystal cell was irradiated with ultraviolet rays using a fluorescent lamp through a color filter that filters ultraviolet rays of 310nm or less. At this time, the illuminance measured under the condition that the central wavelength was 365nm was adjusted to 100mW/cm2Irradiation cumulative light quantity of 30J/cm2Ultraviolet rays (irradiation condition 1); subsequently, the illuminance measured under the condition of a central wavelength of 313nm was adjusted to 3mW/cm using a fluorescent UV lamp2Cumulative quantity of light irradiated 10J/cm2(ultraviolet irradiation condition 2). UV1 is an ultraviolet irradiation process through irradiation condition 1, and UV2 is a process through irradiation condition 1 and irradiation condition 2.
Effect testing
1. Variation of pretilt angle
The mixture prepared by each of the polymerizable compounds and the liquid crystal compound was injected into a test cell. After polymerization of the polymer compound by irradiation with ultraviolet rays, pretilt angles of the test cell after the irradiation processes of UV1 and UV2 were measured, respectively. It is preferable that the pretilt angle change amount is small after the UV1 and UV2 processes.
Under different temperature ranges, the pretilt angles of different areas have no great difference after the UV2 process, so that the mura problem of the areas can be effectively improved.
2. Conversion of polymerizable Compounds
A polymerizable compound is added to the composition, which is consumed by polymerization to form a polymer. The conversion of this reaction is preferably a large conversion.
This is because: from the viewpoint of image retention of the image, the residual amount of the polymer compound (the amount of the unreacted polymerizable compound) is preferably small.
3. Liquid crystal quality test VHR & ION
VHR is charge retention rate, the higher VHR is the longer the power-on holding time of the liquid crystal panel is, ION is ION content in liquid crystal, the lower ION is the better the quality of the liquid crystal panel is, VHR and ION are quality parameters of the liquid crystal panel, the higher VHR value is, and the lower ION value is preferred.
The test results are shown in tables 26 to 35;
watch 26
Figure BDA0002697435100000341
Watch 27
Figure BDA0002697435100000342
Watch 28
Figure BDA0002697435100000343
Figure BDA0002697435100000351
Watch 29
Figure BDA0002697435100000352
Watch 30
Figure BDA0002697435100000353
Figure BDA0002697435100000361
Watch 31
Figure BDA0002697435100000362
Watch 32
Figure BDA0002697435100000363
Watch 33
Figure BDA0002697435100000364
Figure BDA0002697435100000371
Watch 34
Figure BDA0002697435100000372
Watch 35
Figure BDA0002697435100000373
Figure BDA0002697435100000381
Compared with comparative example 1, the polymer stable alignment type liquid crystal composition has the advantages of PSVA liquid crystal, has the advantages of small pretilt angle variation, less residue and high conversion rate, reduces the pretilt angle return angle problem caused by the UV2 process, and effectively solves the problem of region Mura.
Meanwhile, the polymer stable alignment type liquid crystal composition has the advantage of an SA display mode, a PI (polyimide) preparation process is omitted, the preparation difficulty is reduced, and the production cost is reduced; compared with a test cell with PI, the quality is also obviously improved.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. A polymer stable alignment liquid crystal composition comprising at least one of polymerizable compounds represented by the general formula I, a nematic liquid crystal material and a self-alignment additive:
Figure FDA0002697435090000011
wherein L is1、L2、L3、L4、L5、L6Each independently represents H, -F, -Cl, -CH3、-C2H5、-OCH3、-OC2H5、-CF3Or OCF3And L is3、L4Not both being H and L1、L2、L5、L6At least one of them is-CH3or-OCH3；
P1、P2Each independently represents an acrylate group, a methacrylate group, a fluoroacrylate groupA group, a chloroacrylate group, a vinyloxy group, an oxetane group or an epoxy group;
Z1、Z2each independently represents a single bond, -O-, -S-, -CO-O-, -O-CO-O-, -CH-N-, -N-CH-, -N-, or C1-C12Alkylene or C2-C12Alkenyl of (a); or, said C1-C12Alkylene or C2-C12At least one hydrogen atom in the alkenyl group of (a) is substituted with F, Cl or CN; or, said C1-C12Alkylene or C2-C12One of alkenyl groups of (2) -CH2-or at least two non-adjacent-CHs2-substituted by-O-, -S-, -NH-, -CO-, COO-, -OCO-, -OCOO-, -SCO-, -COs-or-C ═ C-in a manner not directly linked to each other;
the nematic liquid crystal material comprises at least one of the compounds represented by the general formula II, at least one of the compounds represented by the general formula III:
Figure FDA0002697435090000012
wherein, in the general formula II, R1、R2Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the1、A2Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene; z3Represents a single bond, -CH2CH2-or-CH2O-; a is 0 or 1;
in the general formula III, R3、R4Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the3、A4Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
the self-aligning additive includes at least one of the compounds represented by formula V:
Figure FDA0002697435090000021
wherein L is7Represents H, -F, -Cl, -CH3、-C2H5、-OCH3、-OC2H5、-CF3or-OCF3；
P3、P4Each independently represents an acrylate group, a methacrylate group, a fluoroacrylate group, a chloroacrylate group, a vinyloxy group, an oxetane group or an epoxy group;
R7、R8、R9、R10、R11each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12Linear alkenyl groups of (a).
2. The polymer stably aligned liquid crystal composition of claim 1, wherein in formula I, L is1、L2、L3、L4、L5、L6Each independently represents H, -F, -CH3or-OCH3And L is3、L4Not H at the same time;
P1、P2each independently represents an acrylate group, a methacrylate group, a fluoroacrylate group, or a chloroacrylate group;
Z1、Z2each independently represents a single bond, -O-, -S-, -CO-O-, -O-CO-, C1-C6Alkylene or C2-C6Alkenyl of (a); or, said C1-C6Alkylene or C2-C6At least one hydrogen atom in the alkenyl group of (a) is substituted by F; or, said C1-C6Alkylene or C2-C6One of alkenyl groups of (2) -CH2-or at least two non-adjacent-CHs2-is substituted by-O-in a manner not directly linked to each other;
preferably, the compound represented by the general formula I is selected from one or more of the formulas I-1 to I-28:
Figure FDA0002697435090000031
Figure FDA0002697435090000041
Figure FDA0002697435090000051
more preferably, the compound represented by the general formula I is selected from one or more of the formulas I-1 to I-5 and I-18.
3. The polymer-stabilized alignment liquid crystal composition of claim 1, wherein the compound represented by formula II is selected from one or more of formula IIA to formula IIF:
Figure FDA0002697435090000052
preferably, the compound represented by formula II is selected from one or more of formulae IIA-1 to IIF-16:
Figure FDA0002697435090000053
Figure FDA0002697435090000061
Figure FDA0002697435090000071
Figure FDA0002697435090000081
Figure FDA0002697435090000091
Figure FDA0002697435090000101
more preferably, the compound represented by the general formula II is selected from one or more of the compounds of the formulas IIA-9-IIA-24, IIB-19-IIB-38, IIC-9-IIC-24, IID-9-IID-24, IIE-1-IIE-20 and IIF-1-IIF-16;
most preferably, the compound represented by formula II is selected from one or more of the group consisting of formula IIA-13 to IIA-24, IIB-23 to IIB-38, IIC-13 to IIC-24, IID-13 to IID-24, IIE-1, IIE-2, IIE-5, IIE-6, IIE-9, IIE-10, IIE-13, IIE-14, IIE-17, IIE-18, IIF-1, IIF-2, IIF-5, IIF-6, IIF-9, IIF-10, IIF-13 and IIF-14.
4. The polymer stably aligned liquid crystal composition of claim 1, wherein the compound represented by formula III is selected from one or more of formulae IIIA to IIIC:
Figure FDA0002697435090000111
preferably, the compound represented by formula III is selected from one or more of formulae IIIA-1 to IIIC-24:
Figure FDA0002697435090000112
Figure FDA0002697435090000121
Figure FDA0002697435090000131
more preferably, the compound represented by the general formula III is selected from one or more of the compounds in the formulas IIIA-1 to IIIA-24, IIIB-1 to IIIB-24 and IIIC-1 to IIIC-22;
most preferably, the compound represented by the general formula III is selected from one or more of the following formulas IIIA-1 to IIIA-12, IIIB-17 to IIIB-24, IIIC-1 to IIIC-4 and IIIC-15 to IIIC-18.
5. The polymer stabilized alignment liquid crystal composition of claim 1, 3 or 4, wherein the nematic liquid crystal material further comprises at least one of the compounds represented by formula IV:
Figure FDA0002697435090000141
wherein R is5、R6Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the5Represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
preferably, the compound represented by formula IV is selected from one or more of formulae IVA to IVB:
Figure FDA0002697435090000142
wherein R is5、R6Each independently represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C2～C7A linear alkenyl group of (a);
more preferably, the compound represented by formula IV is selected from one or more of formulas IVA-1 to IVB-63:
Figure FDA0002697435090000143
Figure FDA0002697435090000151
Figure FDA0002697435090000161
Figure FDA0002697435090000171
Figure FDA0002697435090000181
most preferably, the compound represented by formula IV is selected from one or more of formulas IVA-39 to IVA-44, IVB-39 to IVB-48.
6. The polymer stably aligned liquid crystal composition of claim 1, wherein in formula V, P is3、P4Each independently represents an acrylate group, a methacrylate group, a fluoroacrylate group, or a chloroacrylate group;
R7、R8、R9、R10、R11each independently represents C1～C5Straight chain alkyl group of (1), C1～C5Linear alkoxy of (5) or C2～C5A linear alkenyl group of (a);
preferably, the compound represented by formula V is selected from one or more of formulas V-1 to V-24:
Figure FDA0002697435090000182
Figure FDA0002697435090000191
Figure FDA0002697435090000201
Figure FDA0002697435090000211
more preferably, the compound represented by formula V is selected from one or more of the formulas V-8, V-12, V-16, V-24.
7. The polymer stably aligned liquid crystal composition of any one of claims 1 to 6, further comprising an antioxidant; the antioxidant comprises at least one of the compounds represented by formula VI:
Figure FDA0002697435090000221
wherein R is12Represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C2～C7A linear alkenyl group of (a); a. the6Represents trans-1, 4-cyclohexyl or 1, 4-phenylene; b is 0 or 1;
preferably, the compound represented by formula VI is selected from one or more of the group consisting of formula VI-1 to formula VI-2:
Figure FDA0002697435090000222
8. the polymer stably aligned liquid crystal composition of claim 7, wherein the nematic liquid crystal material comprises the following components in weight percent:
(1) 1-80% of a compound represented by the general formula II;
(2) 1 to 70% of a compound represented by the general formula III;
(3) 0 to 40% of a compound represented by the general formula IV;
preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 5-70% of a compound represented by the general formula II;
(2) 20-60% of a compound represented by the general formula III;
(3) 0 to 35% of a compound represented by the general formula IV;
more preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 10-70% of a compound represented by the general formula II;
(2) 25 to 60% of a compound represented by the general formula III;
(3) 0 to 30% of a compound represented by the general formula IV;
most preferably, the nematic liquid crystal material comprises the following components in percentage by weight:
(1) 20-70% of a compound represented by the general formula II;
(2) 25 to 50% of a compound represented by the general formula III;
(3) 0 to 20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 0-8% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 5-15% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 5-50% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 20-40% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
or, the nematic phase liquid crystal material comprises the following components in percentage by weight:
(1) 40-70% of a compound represented by the general formula II;
(2) 30-60% of a compound represented by the general formula III;
(3) 10-20% of a compound represented by the general formula IV;
preferably, the nematic liquid crystal material is 100% by weight.
9. The polymer stable alignment liquid crystal composition according to claim 8, wherein the amount of the compound represented by the general formula I is 0.01-5% of the mass of the nematic liquid crystal material; preferably 0.05-1%; more preferably 0.1 to 0.5%; most preferably 0.15-0.32%;
and/or the dosage of the compound represented by the general formula V is 0.01-5% of the mass of the nematic liquid crystal material; preferably 0.1-5%; more preferably 0.2-2%;
and/or the dosage of the compound represented by the general formula VI is 0-0.05% of the mass of the nematic liquid crystal material.
10. Use of a polymer stabilised alignment liquid crystal composition according to any one of claims 1 to 9 in a liquid crystal display device; preferably in a liquid crystal display device of the SAVA type.
CN202011010608.4A 2020-09-23 2020-09-23 Polymer stable alignment type liquid crystal composition and application thereof Pending CN112175635A (en)

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