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CN111117664A - Liquid crystal composition and liquid crystal display device thereof - Google Patents

Liquid crystal composition and liquid crystal display device thereof Download PDF

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Publication number
CN111117664A
CN111117664A CN201811272329.8A CN201811272329A CN111117664A CN 111117664 A CN111117664 A CN 111117664A CN 201811272329 A CN201811272329 A CN 201811272329A CN 111117664 A CN111117664 A CN 111117664A
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liquid crystal
formula
crystal composition
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ring
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CN111117664B (en
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姚利芳
魏科
金睿
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Jiangsu Hecheng Display Technology Co Ltd
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Jiangsu Hecheng Display 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
    • C09K19/04—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
    • C09K19/04—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
    • C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters
    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
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  • General Physics & Mathematics (AREA)
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  • Liquid Crystal Substances (AREA)

Abstract

The present invention provides a liquid crystal composition comprising: at least one compound of the general formula I; at least one compound of the general formula II-1 and/or II-2; at least one compound of the general formula M; and at least one compound of formula N. The invention also provides a liquid crystal display device comprising the liquid crystal composition. The liquid crystal composition provided by the invention has appropriately high optical anisotropy, appropriately high clearing point, good low-temperature stability, higher dielectric anisotropy, high transmittance and larger elastic constant, and when the liquid crystal composition is applied to an IPS (in-plane switching) liquid crystal display device, the transmittance of the display device can be effectively improved, so that the display device has good optical anisotropy, appropriately high clearing point, good low-temperature stability, higher dielectric anisotropy, high transmittance and larger elastic constantThe display effect is good, and meanwhile, the energy-saving and environment-friendly characteristics are achieved.

Description

Liquid crystal composition and liquid crystal display device thereof
Technical Field
The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition and a liquid crystal display device thereof.
Background
Liquid Crystal Displays (LCDs) have been rapidly developed due to their small size, light weight, low power consumption and excellent Display quality, and are widely used particularly in portable electronic information products. As the size of a liquid crystal screen for a portable computer, an office application, a video application increases, in order to enable the liquid crystal display to be used for a large screen display and eventually replace a Cathode Ray Tube (CRT), there are still some problems to be solved, such as improvement of viewing angle characteristics, improvement of response speed, increase of contrast, improvement of transmittance, and the like. The narrow viewing angle of the LCD means that the contrast ratio is significantly reduced when viewed from a direction perpendicular to the normal of the liquid crystal cell, and the phenomenon of gray scale and color inversion occurs when the viewing angle is large, which seriously affects the display quality of the LCD, so that the viewing angle problem becomes a great obstacle to the replacement of the CRT technique by the LCD.
The viewing angle of LCD is determined by the working principle of liquid crystal, the liquid crystal molecules are rod-shaped, different liquid crystal molecule arrangement modes correspond to different optical anisotropies, the smaller the included angle between incident light and the liquid crystal molecules is, the smaller the birefringence is, on the contrary, the larger the birefringence is, the different included angles between light rays which deviate from the normal direction of the display screen and enter a liquid crystal box at different angles and the director of the liquid crystal molecules are, so that the effective optical path difference △ n d is different under different viewing angles, however, the optimal optical path difference of the liquid crystal box is designed according to the normal direction which is vertical to the liquid crystal box, for the light rays which are obliquely incident, the minimum transmittance is increased along with the increase of the included angle, the contrast is reduced, and when the included angle is large enough, the phenomenon of contrast inversion even occurs.
At present, many methods for solving the viewing angle problem have been proposed, such as: an Optically Compensated Bend (OCB) mode, an in-plane switching (IPS) mode, a Fringe Field Switching (FFS) mode, and a multi-domain vertical alignment (MVA) mode. They all have their own advantages and disadvantages: the MVA mode has high contrast and fast response characteristics, but it requires one biaxial compensation film and two elliptical polarizers, and thus is high in cost; the OCB mode is difficult to maintain stable control with ac voltage, the transmittance of R, G, B three monochromatic lights is different, and in the absence of field, the molecules in the liquid crystal cell are aligned in the direction parallel to the substrate, and in order to achieve bend alignment, a voltage is applied to the cell for several seconds for presetting, and then the alignment can be maintained at a lower voltage, which is inconvenient to use; the IPS mode requires only a linear polarizer and does not require a compensation film, but its response speed is too slow to display a fast moving picture. Since the IPS mode and the FFS mode are simple to manufacture and have a wide viewing angle, they are the most attractive approaches capable of improving viewing angle characteristics and realizing large-area display.
In the early 70 s of the last century, experimental studies have been conducted on the basic electro-optical characteristics of the IPS mode of uniformly aligned and twisted nematic liquid crystals, which is characterized in that a pair of electrodes are formed on the same substrate, and the other substrate has no electrode, and the alignment of liquid crystal molecules is controlled by a lateral electric field applied between the pair of electrodes, and thus this mode can also be referred to as a lateral field mode. In the IPS mode, nematic liquid crystal molecules are uniformly arranged in parallel between two substrates, and two polarizing plates are orthogonally arranged. In the IPS mode, when no electric field is applied, incident light is blocked by two orthogonal polarizing plates to be in a dark state, and when an electric field is applied, liquid crystal molecules rotate to cause retardation, so that light leaks from the two orthogonal polarizing plates.
The IPS mode may use a positive liquid crystal or a negative liquid crystal, and since a driving voltage required for a transmittance of 100% decreases with an increase in absolute value of Δ ∈ so that the driving voltage required for a transmittance of 100% is lower than that of the negative liquid crystal and a response speed is faster, but the negative liquid crystal has a better transmittance than that of the positive liquid crystal, mainly because liquid crystal molecules are differently arranged in a liquid crystal cell in the positive and negative IPS modes and are differently arranged and rotated at power-up, the positive liquid crystal molecules have a reduced effective △ n × d due to an influence of a fringe vertical electric field, so that the transmittance of the positive IPS mode is lower than that of the negative IPS mode at power-up, and in view of the fact that a response speed is slow using the negative liquid crystal, it is urgently required to increase the transmittance to the maximum extent in the positive IPS mode.
The skilled person finds, based on the conventional IPS-LCD light leakage test, that the main factors causing the light leakage problem of the liquid crystal display device are: light scattering (LC scattering), rubbing uniformity (rubbing uniformity), color filter light leakage (CF/TFT scattering), and polarization ability (polarization ability), wherein light scattering accounts for 63% of the factors affecting light leakage.
According to the following relationship:
Figure BDA0001846278780000022
in order to improve the light scattering of the liquid crystal material, it is necessary to increase the average elastic constant Kave(wherein,
Figure BDA0001846278780000023
) To improve light scattering; at the increase of KaveIn the case of (2), light leakage of the liquid crystal material can be reduced.
Further, the Contrast (CR) and the luminance (L) are related as follows:
CR＝L255/L0×100％，
wherein L is255Is at on-state brightness, L0Is off state brightness. It can be seen that what significantly affects CR should be L0A change in (c). In the off state, L0The smaller the light scattering (LC scattering), L, is, independent of the dielectric of the liquid crystal molecules, in relation to the light scattering (LC scattering) of the liquid crystal material itself0The smaller the Contrast Ratio (CR) will be, the more significantly the contrast ratio will be.
In view of the above, it is possible to improve the contrast of the liquid crystal material in the positive IPS mode by increasing the average elastic constant K of the liquid crystal compositionaveThe value of (3) makes the liquid crystal molecules have better order degree, less light leakage and higher transmittance, thereby improving the transmittance of the liquid crystal composition.
In addition, in order to maintain a sufficiently high transmittance, most of the liquid crystal compositions in the prior art have a low absolute value of dielectric anisotropy, which results in a high driving voltage of a liquid crystal display device including such a liquid crystal composition, and as a direct result, the energy saving and environmental protection performance of the liquid crystal display device is affected. Therefore, it is desirable to provide a liquid crystal composition having a high absolute value of dielectric anisotropy while maintaining a sufficiently high transmittance.
Disclosure of Invention
The purpose of the invention is as follows: in view of the defects of the prior art, an object of the present invention is to provide a liquid crystal composition, which has a suitably high optical anisotropy, a suitably high clearing point, a good low-temperature stability, a relatively high dielectric anisotropy, a high transmittance, and a relatively large elastic constant, and when the liquid crystal composition is applied to an IPS liquid crystal display device, the transmittance of the display device can be effectively improved, so that the display device has good display effect and good energy-saving and environmental-friendly characteristics. The invention also aims to provide a liquid crystal display device comprising the liquid crystal composition.
The technical scheme of the invention is as follows:
in order to achieve the above object, one aspect of the present invention provides a liquid crystal composition comprising:
at least one compound of the general formula I
Figure BDA0001846278780000031
At least one compound of the general formula II-1 and/or II-2
Figure BDA0001846278780000032
At least one compound of the formula N
Figure BDA0001846278780000041
N; and
at least one compound of the formula M
Figure BDA0001846278780000042
M，
Wherein,
R1represents a linear or branched alkyl group having 1 to 12 carbon atoms, 1 or not adjacent 2 or more-CH in the linear or branched alkyl group having 1 to 12 carbon atoms2-may be independently replaced by-C-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively, and one or more-H of said linear or branched alkyl groups containing 1 to 12 carbon atoms may be independently substituted by-F or-Cl, respectively;
RA1and RA2Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms,
Figure BDA0001846278780000043
Figure BDA0001846278780000044
1 or non-adjacent 2 or more-CH in the linear or branched alkyl containing 1 to 12 carbon atoms2-may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively, and one or more-H present in these groups may be independently substituted by-F or-Cl, respectively;
RN1and RN2Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms, 1 or not adjacent 2 or more-CH in the linear or branched alkyl group having 1 to 12 carbon atoms2-may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-;
RM1and RM2Each independently represents-H, a linear or branched alkyl group having 1 to 12 carbon atoms, a linear or branched alkenyl group having 2 to 12 carbon atoms,
Figure BDA0001846278780000045
The straight chain or branched chain alkyl containing 1 to 12 carbon atoms1 or non-adjacent 2 or more-CH2-may be independently replaced by-C.ident.C-, -O-, -CO-O-or-O-CO-;
ring (C)
Figure BDA0001846278780000046
And ring
Figure BDA0001846278780000047
Each independently represent
Figure BDA0001846278780000048
Wherein,
Figure BDA0001846278780000049
one or more-CH2-may be replaced by-O-, one or more of the ring single bonds may be replaced by double bonds,
Figure BDA00018462787800000410
may be substituted by-CN, -F or-Cl, and one or more rings may be substituted by-CH ═ by-N;
ring (C)
Figure BDA00018462787800000411
Ring (C)
Figure BDA00018462787800000412
Ring (C)
Figure BDA00018462787800000413
And ring
Figure BDA00018462787800000414
Each independently represent
Figure BDA00018462787800000415
Wherein,
Figure BDA00018462787800000416
and
Figure BDA00018462787800000417
one or more-CH2-may be replaced by-O-, one or more of the ring single bonds may be replaced by double bonds,
Figure BDA0001846278780000051
wherein one or more-H may be substituted by-CN, -F or-Cl, and one or more ring-CH may be substituted by-N ═ N;
ring (C)
Figure BDA0001846278780000052
Ring (C)
Figure BDA0001846278780000053
And ring
Figure BDA0001846278780000054
Each independently represent
Figure BDA0001846278780000055
Figure BDA0001846278780000056
Wherein,
Figure BDA0001846278780000057
one or more-CH of2-can be replaced by-O-,
Figure BDA0001846278780000058
at most one-H in (a) may be substituted by halogen;
ring (C)
Figure BDA0001846278780000059
And ring
Figure BDA00018462787800000510
Each independently represent
Figure BDA00018462787800000511
Wherein,
Figure BDA00018462787800000512
one or more-CH2-may be replaced by-O-, one or at most two of the ring bonds in the single bond may be replaced by a double bond,
Figure BDA00018462787800000513
wherein one or more-H may be substituted by-F or-Cl, and one or more ring-CH-may be replaced by-N;
Z1、Z2and Z3Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、 -CH＝CH-、-CF＝CF-、-CH2O-or-OCH2-；
ZA11Represents a single bond, -CH2CH2-、-CF2CF2-、-CF2O-、-OCF2-、-CO-O-、-O-CO-、-O-CO-O-、 -CH＝CH-、-C≡C-、-CF＝CF-、-CH2O-or-OCH2-；
ZA21And ZA22Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、 -CH＝CH-、-C≡C-、-CF＝CF-、-CH2O-or-OCH2-；
ZM1And ZM2Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-、-OCH2-、-CH＝CH-、 -C≡C-、-CH2CH2-or- (CH)2)4-；
ZN1And ZN2Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-(CH2)4-、-CF2O-、-OCF2-or-CF2CF2-；
L1、L2、L3And L4Each independently represents-H, -CH3Or halogen;
x represents halogen, haloalkyl or haloalkoxy having 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy having 2 to 5 carbon atoms;
n1 and n2 each independently represent 0, 1 or 2, and 0. ltoreq. n1+ n 2. ltoreq.3, and when n 1. ltoreq.2, the ring
Figure BDA00018462787800000514
May be the same or different, Z1Which may be the same or different, when n2 is 2, the ring
Figure BDA00018462787800000515
May be the same or different, Z2May be the same or different;
LA11、LA12、LA13、LA21、LA22、LA23and LA24Each independently represents-H, -F, -CH3or-Cl;
XA1and XA2Each independently represents halogen, haloalkyl or haloalkoxy having 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy having 2 to 5 carbon atoms;
nA1and nA2Each independently represents 0, 1, 2 or 3, when nA1When 2 or 3, ring
Figure BDA00018462787800000516
May be the same or different, ZA11May be the same or different, and when n isA2When 2 or 3, ring
Figure BDA00018462787800000517
May be the same or different, ZA21May be the same or different;
nM1represents 0, 1, 2 or 3, and when nM1When 2 or 3, ring
Figure BDA0001846278780000061
May be the same or different, ZM2May be the same or different;
nN1represents 0, 1, 2 or 3, nN2Represents 0 or 1, and 0. ltoreq. nN1+nN2Less than or equal to 3, when n isN1When 2 or 3, ring
Figure BDA0001846278780000062
May be the same or different, ZN1May be the same or different;
when Z isA21And ZA22All represent a single bond and nA2When 1, a ring
Figure BDA0001846278780000063
And ring
Figure BDA0001846278780000064
Is not simultaneously represented
Figure BDA0001846278780000065
When Z is1、Z2And Z3Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH2O-or-OCH2-when 2. ltoreq. n1+ n 2. ltoreq.3; and is
When the ring
Figure BDA0001846278780000066
And ring
Figure BDA0001846278780000067
Is one of
Figure BDA0001846278780000068
When n is greater than nA2Represents 1.
In some embodiments of the present invention, the compound of formula I, the compound of formula II-1 and the compound of formula II-2 each have positive dielectric anisotropy, and the compound of formula N has negative dielectric anisotropy.
In some embodiments of the invention, the absolute value of the dielectric anisotropy of the compound of formula M is not more than 3.
In some embodiments of the present invention, the content of the compound of formula i is desirably adjusted depending on the desired properties of solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, dropping marks, burn-in, dielectric anisotropy, and the like.
The compounds of the general formula I preferably represent the liquid crystal compositions according to the invention in a weight ratio: the lower limit of the preferred weight percentage of the compound of formula i in the liquid crystal composition of the present invention is 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 20%, 30% or 40% relative to the total weight of the liquid crystal composition of the present invention; the preferred upper limit of the weight percentage of the compound of formula I in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 60%, 55%, 50%, 45%, 40%, 35%, 30%, 28%, 27%, 26%, 25.5%, 25%, 24.5%, 24%, 22% or 20%.
In some embodiments of the invention, the compound of formula I is present in an amount of 0.1% to 60% by weight of the liquid crystal composition.
In some embodiments of the invention, in the compounds of formula I, R1Preferably a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 8 carbon atoms, more preferably a linear or branched alkyl or alkoxy group having 1 to 5 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 5 carbon atoms;
ring (C)
Figure BDA0001846278780000069
And ring
Figure BDA00018462787800000610
Each independently represent
Figure BDA00018462787800000611
Figure BDA0001846278780000071
In some embodiments of the invention, the compound of formula i is selected from the group consisting of:
Figure BDA0001846278780000072
wherein,
L5represents-H or-F;
Rxand RyEach independently represents-CH2-or-O-; and is
n1 represents 0 or 1.
In some embodiments of the present invention, the liquid crystal compositions of the present invention preferably comprise at least one compound of formula I; more preferably at least one compound of the general formulae I-1 to I-8; further preferred are compounds containing 2 to 10 of the general formulae I-1 to I-8.
In some embodiments of the present invention, the liquid crystal compositions of the present invention preferably contain at least two compounds of the general formulae I-1 to I-8.
In some embodiments of the invention, the compound of formula i is preferably selected from the group consisting of:
Figure BDA0001846278780000081
Figure BDA0001846278780000091
Figure BDA0001846278780000101
Figure BDA0001846278780000111
Figure BDA0001846278780000121
Figure BDA0001846278780000131
Figure BDA0001846278780000141
in some embodiments of the present invention, the compounds of formula I are preferably selected from the group consisting of compounds of formulae I-1-6, formulae I-2-6, formulae I-5-7, and formulae I-8-9.
In some embodiments of the invention, in the compounds of formula II-1 and/or formula II-2, RA1And RA2Preferably each independently represents a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 8 carbon atoms; further preferably, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 5 carbon atoms, a linear or branched alkenyl group or alkenyloxy group having 2 to 5 carbon atoms.
In some embodiments of the invention, the ring
Figure BDA0001846278780000142
Ring (C)
Figure BDA0001846278780000143
Ring (C)
Figure BDA0001846278780000144
And ring
Figure BDA0001846278780000145
Each independently represent
Figure BDA0001846278780000146
Figure BDA0001846278780000147
Figure BDA0001846278780000151
In some embodiments of the present invention, the compound of formula II-1 is selected from the group consisting of:
Figure BDA0001846278780000152
Figure BDA0001846278780000161
Figure BDA0001846278780000171
Figure BDA0001846278780000181
Figure BDA0001846278780000191
Figure BDA0001846278780000201
Figure BDA0001846278780000211
wherein,
RA1represents a linear or branched alkyl group having 1 to 12 carbon atoms, 1 or not adjacent 2 or more-CH in the linear or branched alkyl group having 1 to 12 carbon atoms2-may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively.
In some embodiments of the present invention, the compound of formula II-2 is selected from the group consisting of:
Figure BDA0001846278780000221
Figure BDA0001846278780000231
Figure BDA0001846278780000241
Figure BDA0001846278780000251
wherein,
RA2represents a linear or branched alkyl group having 1 to 8 carbon atoms, 1 or not adjacent 2 or more-CH in the linear or branched alkyl group having 1 to 8 carbon atoms2-may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively, and one or more-H present in these groups may be independently substituted by-F or-Cl, respectively.
As to the weight percentage of the compound of the formula II-1 and/or the formula II-2 to the liquid crystal composition of the present invention, it is preferable: the lower limit of the preferred weight percentage of the compound of formula II-1 and/or II-2 to the liquid crystal composition of the invention is 1%, 3%, 5%, 7%, 9%, 10%, 12%, 15%, 18%, 20%, 30% or 40%, relative to the total weight of the liquid crystal composition of the invention; the upper limit of the weight percentage of the compound of the formula II-1 and/or the formula II-2 in the liquid crystal composition of the present invention is preferably 75%, 70%, 65%, 60%, 55%, 50%, 45%, 35% or 25% with respect to the total weight of the liquid crystal composition of the present invention.
In some embodiments of the invention, the compounds of formula II-1 and/or formula II-2 comprise from 1% to 75% by weight of the liquid crystal composition.
In some embodiments of the present invention, the compound of formula II-1 is preferably a compound having an absolute value of dielectric anisotropy of greater than 4.
In some embodiments of the present invention, the compound of formula II-1 is preferably selected from the group consisting of compounds of formulae II-1-1, formulae II-1-5, formulae II-1-16, formulae II-1-20, formulae II-1-22, formulae II-1-23, formulae II-1-24, formulae II-1-25, formulae II-1-29, formulae II-1-33, formulae II-1-35, formulae II-1-37, formulae II-1-40, formulae II-1-44, formulae II-1-51, and formulae II-1-62.
In some embodiments of the present invention, the compound of formula II-2 is preferably selected from the group consisting of compounds of formula II-2-1, formula II-2-2, formula II-2-3, formula II-2-4, formula II-2-15, formula II-2-16, formula II-2-17, formula II-2-19, formula II-2-20, formula II-2-24, formula II-2-26, formula II-2-28, formula II-2-29, formula II-2-32, and formula II-2-34.
In some embodiments of the present invention, it is preferred that the compound of formula II-1 is selected from the group consisting of at least one compound of formulae II-1-1, II-1-3, II-1-5, II-1-6, II-1-8 to II-1-10, II-1-12 to II-1-20, II-1-22 to II-1-25, II-1-27, II-1-30, II-1-31, II-1-33, II-1-35, II-1-40, II-1-42, II-1-44, and II-1-50 to II-1-61; further preferably, the compound of the formula II-1 is selected from the group consisting of at least two compounds of the formulae II-1-1, II-1-3, II-1-5, II-1-6, II-1-8 to II-1-10, II-1-12 to II-1-20, II-1-22 to II-1-25, II-1-27, II-1-30, II-1-31, II-1-33, II-1-35, II-1-40, II-1-42, II-1-44, and II-1-50 to II-1-61; still more preferably, the compound of the formula II-1 is selected from the group consisting of at least three compounds of the formulae II-1-1, II-1-3, II-1-5, II-1-6, II-1-8 to II-1-10, II-1-12 to II-1-20, II-1-22 to II-1-25, II-1-27, II-1-30, II-1-31, II-1-33, II-1-35, II-1-40, II-1-42, II-1-44, and II-1-50 to II-1-61.
In some embodiments of the present invention, it is preferred that the liquid crystal composition of the present invention comprises at least one compound of formula II-2; more preferably at least one compound of the general formulae II-2-1 to II-2-3, II-2-15 to II-2-20, II-2-24, II-2-26, II-2-28 to II-2-33; further preferably 2 to 12 compounds of the general formulae II-2-1 to II-2-3, II-2-15 to II-2-20, II-2-24, II-2-26, II-2-28 to II-2-33; further preferably 2 to 10 compounds of the general formulae II-2-1 to II-2-3, II-2-15 to II-2-20, II-2-24, II-2-26, II-2-28 to II-2-33; still more preferably 2 to 8 kinds of compounds of the general formulae II-2-1 to II-2-3, II-2-15 to II-2-20, II-2-24, II-2-26, II-2-28 to II-2-33.
The weight percentage of the compound of formula II-1 in the liquid crystal composition of the present invention is preferably: the lower limit of the preferred weight percentage of the compound of formula II-1 to the liquid crystal composition of the present invention is 1%, 3%, 5%, 7%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, 33%, 35%, 38% or 40% relative to the total weight of the liquid crystal composition of the present invention; the upper limit of the amount of the compound of the formula II-1 in the liquid crystal composition of the present invention is preferably 55%, 52%, 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% or 10% by weight relative to the total weight of the liquid crystal composition of the present invention.
The weight percentage of the compound of formula II-2 in the liquid crystal composition of the present invention is preferably: the lower limit of the preferred weight percentage of the compound of formula II-2 to the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35% or 38% relative to the total weight of the liquid crystal composition of the present invention; the upper limit of the amount of the compound of the general formula II-2 in the liquid crystal composition of the present invention is preferably 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% or 10% by weight relative to the total weight of the liquid crystal composition of the present invention.
In some embodiments of the present invention, when it is desired to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, it is preferable that the lower limit value and the upper limit value of the total weight percentage of the compounds of formula II-1 and/or formula II-2 are slightly lower, wherein the lower limit value is preferably: 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38% or 40%, and the upper limit value is preferably: 50%, 48%, 46%, 43%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23% or 20%; further, when it is desired to maintain the liquid crystal composition of the present invention having a high clearing point and good temperature stability, the lower limit value and the upper limit value of the total weight percentage of the compounds of the general formula II-1 and/or the general formula II-2 are preferably slightly lower and the lower limit value is preferably: 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, and the upper limit value is preferably: 50%, 45%, 40%, 38%, 35%, 33%, 30%, 28% or 25%. In addition, when the dielectric anisotropy is increased in order to keep the driving voltage low, it is preferable that the lower limit value of the total weight percentage of the compounds of the general formula II-1 and/or the general formula II-2 is increased and the upper limit value is increased, wherein the lower limit value is preferably: 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, and the upper limit value is preferably: 70%, 68%, 65%, 63%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28% or 25%.
In some embodiments of the invention, in the compound of formula N, RN1And RN2Preferably each independently represents a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 8 carbon atoms; further preferably each independently represents a linear or branched alkyl or alkoxy group having 1 to 5 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 5 carbon atoms;
RN1more preferably a linear or branched alkyl group having 1 to 5 carbon atoms or a linear or branched alkenyl group having 2 to 5 carbon atoms, and still more preferably a linear or branched alkyl group having 2 to 5 carbon atoms or a linear or branched alkenyl group having 2 to 3 carbon atoms;
RN2further preferred is a straight or branched alkoxy group having 1 to 4 carbon atoms;
ring (C)
Figure BDA0001846278780000271
And ring
Figure BDA0001846278780000272
Each independently represent
Figure BDA0001846278780000273
Figure BDA0001846278780000274
In some embodiments of the invention, the compound of formula N is selected from the group consisting of:
Figure BDA0001846278780000281
Figure BDA0001846278780000291
in some embodiments of the present invention, the liquid crystal composition of the present invention preferably comprises at least one compound of formula N; more preferably at least one compound of the formulae N2 to N7, N10 to N19; further preferably, 2 to 10 compounds of the general formulae N2 to N7 and N10 to N19 are contained.
In some embodiments of the invention, the compound of formula N is preferably selected from the group consisting of compounds of formula N2, formula N3, formula N5, formula N6, formula N10, formula N11, formula N12, formula N13, formula N17, and formula N18.
The weight percentage of the compound of formula N in the liquid crystal composition of the present invention is preferably: the lower limit of the preferred weight percentage of the compound of formula N in the liquid crystal composition of the invention relative to the total weight of the composition of the invention is 0.1%, 0.5%, 1%, 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38% or 40%; the upper limit of the percentage by weight of the compound of formula N in the liquid crystal composition of the invention is preferably 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% or 10% relative to the total weight of the composition of the invention.
In some embodiments of the present invention, the compound of formula N is present in an amount of 0.1% to 50% by weight of the liquid crystal composition.
In some embodiments of the present invention, when it is desired to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, it is preferable that the lower limit value and the upper limit value of the content of the compound of formula N are low. Further, when it is necessary to keep the clearing point of the liquid crystal composition of the present invention high and the temperature stability is good, the lower limit value and the upper limit value of the content of the compound of the general formula N are preferably low. In addition, when the dielectric anisotropy is increased in order to keep the driving voltage low, it is preferable that the lower limit value and the upper limit value of the content of the compound of the general formula N are increased.
In some embodiments of the present invention, the compound of formula M is effective in improving clearing point, response time, contrast and low temperature stability of the liquid crystal composition.
In some embodiments of the invention, in the compound of formula M, RM1And RM2Each independently preferably a linear or branched alkyl group having 1 to 10 carbon atoms, a linear or branched alkoxy group having 1 to 9 carbon atoms, a linear or branched alkenyl group having 2 to 10 carbon atoms, or a linear or branched alkenyloxy group having 2 to 10 carbon atoms; further preferably a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkoxy group having 1 to 7 carbon atoms, or a linear or branched alkenyl group having 2 to 8 carbon atoms; still more preferably a linear or branched alkyl group having 1 to 5 carbon atoms, a linear or branched alkoxy group having 1 to 5 carbon atoms, or a linear or branched alkenyl group having 2 to 5 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2One or both of them are straight chain or branched chain alkenyl containing 2 to 8 carbon atoms; further preferably, RM1And RM2One or both of them are straight chain or branched chain alkenyl groups having 2 to 5 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2One of them is a straight chain or branched alkenyl group having 2 to 5 carbon atoms, andthe other is a linear or branched alkyl group having 1 to 5 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2Both are a linear or branched alkyl group having 1 to 8 carbon atoms or a linear or branched alkoxy group having 1 to 7 carbon atoms; more preferably a linear or branched alkyl group having 1 to 5 carbon atoms or a linear or branched alkoxy group having 1 to 4 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2One is a linear or branched alkyl group having 1 to 5 carbon atoms, and the other is a linear or branched alkyl group having 1 to 5 carbon atoms, or a linear or branched alkoxy group having 1 to 4 carbon atoms; further preferably, RM1And RM2Both are straight-chain or branched alkyl groups having 1 to 5 carbon atoms.
The alkenyl group in the present invention is preferably selected from groups represented by any one of formulae (V1) to (V9), and particularly preferably formula (V1), formula (V2), formula (V8), or formula (V9). The groups represented by formulae (V1) to (V9) are shown below:
Figure BDA0001846278780000311
wherein denotes the carbon atom in the ring structure to which it is bonded.
The alkenyloxy group in the present invention is preferably selected from groups represented by any one of formulae (OV1) to (OV9), and particularly preferably formula (OV1), formula (OV2), formula (OV8), or formula (OV 9). The groups represented by formulae (OV1) to (OV9) are shown below:
Figure BDA0001846278780000312
wherein denotes the carbon atom in the ring structure to which it is bonded.
In some embodiments of the invention, the compound of formula M is selected from the group consisting of:
Figure BDA0001846278780000313
Figure BDA0001846278780000321
in some embodiments of the present invention, the content of the compound of formula M must be properly adjusted depending on desired properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drop trace, burn-in, dielectric anisotropy, and the like.
The weight percentage of the compound of formula M in the liquid crystal composition of the present invention is preferably: the lower limit of the preferred weight percentage of the compound of formula M in the liquid crystal composition of the present invention with respect to the total weight of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 45%, 48% or 50%; the preferred upper limit of the weight percentage of the compound of formula M in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 80%, 75%, 70%, 65%, 60%, 55%, 50%, 45%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 22% or 20%.
In some embodiments of the present invention, the compound of formula M comprises 1% to 80% by weight of the liquid crystal composition.
In some embodiments of the invention, the compound of formula M is preferably selected from the group consisting of compounds of formula M1, formula M2, formula M3, formula M7, formula M8, formula M9, formula M11, formula M12, formula M13, formula M14, formula M15, formula M17, formula M18, formula M19, formula M20 and formula M21.
In some embodiments of the invention, the compound of formula M is preferably selected from the group consisting of compounds of formula M1, formula M2, formula M3, formula M7, formula M11, formula M13, formula M18, and formula M21.
In some embodiments of the inventionIn embodiments, where reliability is a concern, R is included in the group of compounds of formula M1, formula M2, formula M3, formula M7, formula M8, formula M9, formula M11, formula M12, formula M13, formula M14, formula M17, formula M18, formula M19, formula M20, and formula M21M1And RM2Compounds which are all alkyl; in the case where importance is attached to the reduction of the volatility of the compound, R is contained in a group consisting of compounds of formula M1, formula M2, formula M3, formula M7, formula M8, formula M9, formula M11, formula M12, formula M13, formula M14, formula M17, formula M18, formula M19, formula M20 and formula M21M1And RM2Compounds which are all alkoxy groups; and when importance is attached to the reduction in viscosity, R is contained in a group consisting of compounds of formula M1, formula M2, formula M3, formula M7, formula M8, formula M9, formula M11, formula M12, formula M13, formula M14, formula M17, formula M18, formula M19, formula M20 and formula M21M1And RM2A compound in which at least one is alkenyl.
In some embodiments of the present invention, the compound of formula M1 is particularly preferably selected from the group consisting of:
Figure BDA0001846278780000331
Figure BDA0001846278780000341
wherein,
RM1represents a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, or a linear or branched alkenyl or alkenyloxy group having 2 to 8 carbon atoms; and is
RM11And RM21Each independently represents a linear or branched alkyl or alkoxy group containing 1 to 8 carbon atoms.
The weight percentage of the compound of formula M1 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M1 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 1%, 2%, 3%, 5%, 7%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or 55%; the upper limit of the preferred weight percentage of the compound of formula M1 in the liquid crystal composition of the invention is 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25% relative to the total weight of the liquid crystal composition of the invention.
In some embodiments of the invention, the compound of formula M1 is preferably selected from the group consisting of compounds of formula M1-a and formula M1-b.
In some embodiments of the invention, RM1Preferably a linear or branched alkyl group having 1 to 5 carbon atoms or a linear or branched alkenyl group having 2 to 5 carbon atoms; further preferably a linear or branched alkyl or alkenyl group having 2 to 5 carbon atoms.
In some embodiments of the present invention, R in the compounds of the formula M1-a and of the formula M1-b is particularly preferred for the particular improvement of the response timesM1A compound which is ethyl or n-propyl.
R in the compound of the formula M1-a relative to the total weight of the liquid crystal composition of the inventionM1The lower limit value of the compound representing an ethyl group or an n-propyl group in the weight percentage of the liquid crystal composition of the present invention is preferably 0%, 1%, 5%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; r in the compound of the formula M1-a relative to the total weight of the liquid crystal composition of the inventionM1The upper limit of the compound representing an ethyl group or an n-propyl group in the liquid crystal composition of the present invention is preferably 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28% or 25% by weight.
R in the compound of the formula M1-b relative to the total weight of the liquid crystal composition of the inventionM1The lower limit value of the compound representing the n-propyl group, which is preferably 0%, 1%, 2%, 3%, 5%, 7% or 10% by weight of the liquid crystal composition of the present invention; r in the compound of the formula M1-b relative to the total weight of the liquid crystal composition of the inventionM1Compounds representing n-propyl radicals in accordance with the inventionThe upper limit of the weight percentage of the liquid crystal composition is preferably 30%, 25%, 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.
In some embodiments of the invention, it is preferred for the clearing point that R in the compound of formula M1 is R when it is desired to obtain a higher clearing point by the compound of formula M1M1A compound represented by butyl or pentyl; further preferred is R in the compound of formula M1M1A compound represented by n-butyl or n-pentyl.
R in the compounds of the formula M1-a and/or M1-b relative to the total weight of the liquid-crystal composition of the inventionM1The preferred lower limit value of the weight percentage of the compound representing n-butyl or n-pentyl group to the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 8%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; r in the compounds of the formula M1-a and/or M1-b relative to the total weight of the liquid-crystal composition of the inventionM1The upper limit value of the compound representing n-butyl or n-pentyl group preferably accounts for 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23% or 20% by weight of the liquid crystal composition of the present invention.
The preferred lower limit of the weight percentage of the compound of formula M1-c in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; the upper limit value of the compound of the formula M1-c in the weight percent of the liquid crystal composition of the invention is preferably 25%, 23%, 20%, 17%, 15%, 13% or 10% relative to the total weight of the liquid crystal composition of the invention.
The preferred lower limit of the weight percentage of the compound of formula M1-d in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; the upper limit value of the compound of the formula M1-d in a weight percentage of the liquid crystal composition of the invention is preferably 25%, 23%, 20%, 17%, 15%, 13% or 10% relative to the total weight of the liquid crystal composition of the invention.
The preferred lower limit of the weight percentage of the compound of formula M1-e to the liquid crystal composition of the invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20% relative to the total weight of the liquid crystal composition of the invention; the upper limit of the preferred weight percentage of the compound of formula M1-e to the liquid crystal composition of the invention is 25%, 23%, 20%, 17%, 15%, 13% or 10% relative to the total weight of the liquid crystal composition of the invention.
The preferred lower limit of the weight percentage of the compound of formula M1-f in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; the upper limit value of the compound of formula M1-f in the weight percent of the liquid crystal composition of the invention is preferably 25%, 23%, 20%, 17%, 15%, 13% or 10% relative to the total weight of the liquid crystal composition of the invention.
The preferred lower limit of the weight percentage of the compound of formula M1-g to the liquid crystal composition of the invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20% relative to the total weight of the liquid crystal composition of the invention; the upper limit of the preferred weight percentage of the compound of formula M1-g to the liquid crystal composition of the invention is 25%, 23%, 20%, 17%, 15%, 13% or 10% relative to the total weight of the liquid crystal composition of the invention.
In some embodiments of the invention, R in compounds of formula M1-f and/or formula M1-g is preferredM1A compound which is ethyl or n-propyl.
R in the compounds of the formula M1-f and/or M1-g relative to the total weight of the liquid-crystal composition of the inventionM1The preferred lower limit of the weight percentage of the compound being ethyl or n-propyl in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; r in the compounds of the formula M1-f and/or M1-g relative to the total weight of the liquid-crystal composition of the inventionM1The preferred upper limit of the weight percentage of the compound which is ethyl or n-propyl in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.
In some embodiments of the invention, in the compounds of formula M1-h, RM11Preferably a linear or branched alkyl or alkoxy group having 1 to 7 carbon atoms; further preferably a straight-chain or branched alkyl group or alkoxy group having 1 to 5 carbon atoms.
The preferred lower limit of the weight percentage of the compound of formula M1-h to the liquid crystal composition of the invention is 0%, 1%, 3%, 5%, 7%, 10%, 13%, 15%, 17%, 20%, 23%, 25% or 30% relative to the total weight of the liquid crystal composition of the invention; the preferred upper limit of the weight percentage of the compound of formula M1-h to the liquid crystal composition of the invention is 60%, 55%, 50%, 45%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13% or 10% relative to the total weight of the liquid crystal composition of the invention.
In some embodiments of the present invention, R in the compounds of formula M1-h is preferred in order to improve especially the response time of the liquid crystal compositions of the present inventionM11Is ethyl, n-propyl, butyl or pentyl, and RM21A compound that is methyl or methoxy; r in the compounds of the formula M1-hM11Is ethyl, n-propyl, butyl or pentyl, and RM211A compound that is ethyl or ethoxy; or R in the compounds of the formula M1-hM11Is n-propyl, butyl or pentyl, and RM21A compound that is n-propyl or propoxy.
R in the compounds of the formula M1-h relative to the total weight of the liquid-crystal composition of the inventionM11Is n-propyl and RM21The preferred lower limit value of the weight percentage of the compound which is an ethyl group in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; r in the formula M1-h relative to the total weight of the liquid crystal composition of the inventionM11Is n-propyl and RM21The upper limit of the preferred weight percentage of the compound which is an ethyl group in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.
The weight percentage of the compound of formula M2 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M2 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7% or 10%; the upper limit of the preferred weight percentage of the compound of formula M2 in the liquid crystal composition of the invention is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3% relative to the total weight of the liquid crystal composition of the invention.
The weight percentage of the compound of formula M3 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M3 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7% or 10%; the upper limit of the preferred weight percentage of the compound of formula M3 in the liquid crystal composition of the invention is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3% relative to the total weight of the liquid crystal composition of the invention.
The weight percentage of the compound of formula M7 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M7 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M7 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5% relative to the total weight of the liquid crystal composition of the invention.
In some embodiments of the present invention, it is preferable to contain R in the compound of the formula M7 in view of required properties of solubility at low temperature, transition temperature, electrical reliability, birefringence and the likeM1Is a linear or branched alkenyl radical having 2 to 4 carbon atoms, and RM2Is CH3The compound of (a), the straight-chain or branched alkenyl group having 2 to 4 carbon atoms is more preferably
Figure BDA0001846278780000371
R in the compound of formula M7 relative to the total weight of the liquid crystal composition of the inventionM1Is composed of
Figure BDA0001846278780000372
And R isM2Is CH3The lower limit of the weight percentage of the compound of (a) to the liquid crystal composition of the present invention is preferably 0%, 1%, 3%, 5%, 7%, 9%, 11%, 12%, 13%, 18% or 21%, and the upper limit is preferably 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When both the two compounds are contained, the lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is preferably 2%, 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and the upper limit thereof is preferably 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 11%, 9%, 7% or 5%, with respect to the total weight of the liquid crystal composition of the present invention.
The weight percentage of the compound of formula M8 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M8 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; the preferred upper limit value of the weight percentage of the compound of formula M8 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 40%, 35%, 30%, 20%, 15%, 10% or 5%.
In some embodiments of the present invention, it is preferable to contain R in the compound of the formula M8 in view of required properties of solubility at low temperature, transition temperature, electrical reliability, birefringence and the likeM1Is a linear or branched alkenyl radical having 2 to 4 carbon atoms, and RM2Is CH3The compound of (a), the straight-chain or branched alkenyl group having 2 to 4 carbon atoms is more preferably
Figure BDA0001846278780000373
R in the compound of formula M8 relative to the total weight of the liquid crystal composition of the inventionM1Is composed of
Figure BDA0001846278780000374
And R isM2Is CH3The lower limit of the weight percentage of the compound of (a) to the liquid crystal composition of the present invention is preferably 0%, 1%, 3%, 4%, 5%, 7%, 9%, 11%, 12%, 13%, 18% or 20%, and the upper limit is preferably 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When two compounds are contained at the same time, the lower limit value of the weight percentage of the two compounds in the liquid crystal composition of the present invention is preferably 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24%, or 30%, and the upper limit value is preferably 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, or 13%, with respect to the total weight of the liquid crystal composition of the present invention.
The weight percentage of the compound of formula M9 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M9 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M9 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5% relative to the total weight of the liquid crystal composition of the invention.
In some embodiments of the invention, the compound of formula M9 is preferably RM1Is ethyl, propyl, butyl or pentyl, and RM2A compound that is methyl or ethyl; or preferably RM1Is composed of
Figure BDA0001846278780000381
And R isM2Being a methyl, ethyl or n-propyl groupAn agent; or preferably RM1Is n-propyl, n-butyl or n-pentyl, and RM2Is CH3A compound of O-.
The weight percentage of the compound of formula M11 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M11 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M11 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5% relative to the total weight of the liquid crystal composition of the invention.
In some embodiments of the invention, the compound of formula M11 is preferably RM1And RM2Each independently represents a linear or branched alkyl group containing 2 to 5 carbon atoms, or preferably RM1And RM2One of them is
Figure BDA0001846278780000382
Figure BDA0001846278780000383
And the other is CH3-or C2H5-a compound of (a).
The weight percentage of the compound of formula M12 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M12 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M12 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5% relative to the total weight of the liquid crystal composition of the invention.
The weight percentage of the compound of formula M13 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M13 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M13 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5% relative to the total weight of the liquid crystal composition of the invention.
The weight percentage of the compound of formula M14 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M14 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M14 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5% relative to the total weight of the liquid crystal composition of the invention.
The weight percentage of the compound of formula M15 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M15 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M15 in the liquid crystal composition of the invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5% relative to the total weight of the liquid crystal composition of the invention.
The weight percentage of the compounds of formulae M17 to M21 in the liquid crystal composition of the present invention is preferably: the lower limit of the preferred total weight percentage of the compounds of formulae M17 to M21 relative to the total weight of the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16% or 20%; the upper limit value of the preferred total weight percentage of the compounds of formulae M17 to M21 relative to the total weight of the liquid crystal composition of the present invention is 30%, 25%, 23%, 20%, 18%, 15%, 12%, 10% or 5%.
In addition to the above compounds, the liquid crystal composition of the present invention may contain a conventional nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, antioxidant, ultraviolet absorber, infrared absorber, polymerizable monomer, light stabilizer, and the like.
Possible dopants which are preferably added to the liquid crystal composition according to the invention are shown below.
Figure BDA0001846278780000391
Figure BDA0001846278780000401
In some embodiments of the present invention, preferably, the dopant comprises 0-5% by weight of the liquid crystal composition; more preferably, the dopant is present in an amount of 0-1% by weight of the liquid crystal composition.
Further, additives such as an antioxidant and a light stabilizer used in the liquid crystal composition of the present invention are preferably as follows:
Figure BDA0001846278780000411
Figure BDA0001846278780000421
Figure BDA0001846278780000431
wherein n represents a positive integer of 1 to 12.
Preferably, the light stabilizer is selected from the group consisting of the light stabilizers shown below:
Figure BDA0001846278780000432
Figure BDA0001846278780000441
in some embodiments of the present invention, preferably, the light stabilizer is 0-5% by weight of the liquid crystal composition; more preferably, the light stabilizer accounts for 0 to 1 percent of the weight of the liquid crystal composition; particularly preferably, the light stabilizer is 0 to 0.1% by weight of the liquid crystal composition.
In another aspect, the present invention also provides a liquid crystal display device comprising the above liquid crystal composition.
The absolute value of the dielectric anisotropy of the liquid crystal composition is not less than 4; preferably not less than 4.2; further preferably not less than 4.5.
Has the advantages that:
the liquid crystal composition provided by the invention has appropriately high optical anisotropy, appropriately high clearing point, good low-temperature stability, higher dielectric anisotropy, high transmittance and larger elastic constant, and when the liquid crystal composition is applied to an IPS liquid crystal display device, the transmittance of the display device can be effectively improved, so that the display device has good display effect and good energy-saving and environment-friendly characteristics. In particular, in the liquid crystal composition of the present invention, when the compound of the general formula i and the compound of the general formula N are added, the compound of the general formula i and the compound of the general formula N can effectively increase the transmittance of the liquid crystal composition; the liquid crystal composition containing the compounds of the general formula I, the general formula II-1 and/or the general formula II-2, the general formula M and the general formula N has higher dielectric anisotropy besides appropriately high optical anisotropy, appropriately high clearing point, good low-temperature stability and high transmittance, so that a liquid crystal display device containing the liquid crystal composition has higher transmittance and good energy-saving and environment-friendly characteristics.
Detailed Description
The invention will be illustrated below with reference to specific embodiments. It should be noted that the following examples are illustrative of the present invention, and are not intended to limit the present invention. Other combinations and various modifications within the spirit or scope of the present invention may be made without departing from the spirit or scope of the present invention.
For convenience of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in Table 1:
TABLE 1 radical structural code of liquid crystal compounds
Figure BDA0001846278780000442
Figure BDA0001846278780000451
Compounds of the following formula are exemplified:
Figure BDA0001846278780000452
the structural formula is represented by the code listed in Table 1, and can be expressed as: nCCGF, wherein n in the code represents the number of C atoms of the left alkyl group, for example, n is 3, namely, the alkyl group is-C3H7(ii) a C in the code represents cyclohexane, G represents 2-fluoro-1, 4-phenylene and F represents fluorine.
The abbreviated codes of the test items in the following examples are as follows:
cp clearing Point (nematic phase-transition temperature of isotropic phase,. degree.C.)
Δ n optical anisotropy (589nm, 25 ℃ C.)
Delta epsilon dielectric anisotropy (1KHz, 25 ℃ C.)
K11Elastic constant ("splay", pN at 25 ℃ C.)
K22Elastic constant ("distortion", pN at 25 ℃ C.)
K33The elastic constant ("bending",pN at 25 ℃)
KaveAverage elastic constant (K)11+K22+K33Average value of (1)
T transmittance (DMS 505 tester, box thickness 3.5 μm)
LTS Low temperature stability
Wherein,
the optical anisotropy was measured using an Abbe refractometer under a sodium lamp (589nm) light source at 25 ℃.
Δε＝ε‖-ε⊥Wherein, epsilon‖Is a dielectric constant parallel to the molecular axis,. epsilon⊥For the dielectric constant perpendicular to the molecular axis, test conditions: the test box is TN90 type at 25 deg.C and 1KHz, and has a thickness of 7 μm.
K11、K22、K33The liquid crystal display device is obtained by using an LCR instrument and an antiparallel friction box to test a C-V curve of liquid crystal and calculating the following test conditions: a 7-micron antiparallel friction box, wherein V is 0.1-20V;
Figure BDA0001846278780000461
test conditions for T transmittance: the DMS 505 tester is used for testing the transmittance of a dimming device at a clearing point +/-10 ℃, and the dimming device is an IPS type liquid crystal testing box with the box thickness of 3.5 microns.
The components used in the following examples can be synthesized by a known method or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds were tested to meet the standards for electronic compounds.
Liquid crystal compositions were prepared according to the compounding ratios of the liquid crystal compositions specified in the following examples. The liquid crystal composition is prepared according to the conventional method in the field, such as heating, ultrasonic wave, suspension and the like, and is mixed according to the specified proportion.
Liquid crystal compositions given in the following examples were prepared and studied. The composition of each liquid crystal composition and the results of the performance parameter test thereof are shown below.
Comparative example 1
The liquid crystal composition of comparative example 1, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared by the respective compounds and weight percentages listed in table 2.
TABLE 2 liquid crystal composition formulation and Performance parameter testing
Figure BDA0001846278780000462
Figure BDA0001846278780000471
Example 1
The liquid crystal composition of example 1 was prepared according to the compounds and weight percentages listed in table 3, and filled between two substrates of a liquid crystal display for performance testing.
TABLE 3 liquid crystal composition formulation and Performance parameter testing
Figure BDA0001846278780000472
Figure BDA0001846278780000481
Example 2
The liquid crystal composition of example 2 was prepared according to the compounds and weight percentages listed in table 4, and filled between two substrates of a liquid crystal display for performance testing.
TABLE 4 liquid crystal composition formulation and Performance parameter testing
Figure BDA0001846278780000482
Example 3
The liquid crystal composition of example 3 was prepared according to the compounds and weight percentages listed in table 5, and filled between two substrates of a liquid crystal display for performance testing.
TABLE 5 liquid Crystal composition formulations and Performance parameter testing
Figure BDA0001846278780000483
Figure BDA0001846278780000491
Example 4
The liquid crystal composition of example 4 was prepared according to the compounds and weight percentages listed in table 6, and filled between two substrates of a liquid crystal display for performance testing.
TABLE 6 liquid crystal composition formulation and Performance parameter testing
Figure BDA0001846278780000492
Figure BDA0001846278780000501
Example 5
The liquid crystal composition of example 5 was prepared according to the compounds and weight percentages listed in table 7, and filled between two substrates of a liquid crystal display for performance testing.
TABLE 7 liquid Crystal composition formulations and Performance parameter testing
Figure BDA0001846278780000502
Example 6
The liquid crystal composition of example 6 was prepared according to the compounds and weight percentages listed in table 8, and filled between two substrates of a liquid crystal display for performance testing.
TABLE 8 liquid crystal composition formulation and Performance parameter testing
Figure BDA0001846278780000503
Figure BDA0001846278780000511
As can be seen from the above comparative example 1 and examples 1 to 6, the liquid crystal composition provided by the present invention has suitably high optical anisotropy, suitably high clearing point, good low temperature stability, relatively high dielectric anisotropy, high transmittance, and relatively large elastic constant, and when the liquid crystal composition is applied to an IPS liquid crystal display device, the transmittance of the display device can be effectively increased, so that the display device has good display effect and also has good energy saving and environmental protection characteristics.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and equivalent changes and modifications made according to the spirit of the present invention should be covered thereby.

Claims (13)

1. A liquid crystal composition, comprising:
at least one compound of the general formula I
Figure FDA0001846278770000011
At least one compound of the general formula II-1 and/or II-2
Figure FDA0001846278770000012
At least one compound of the formula N
Figure FDA0001846278770000013
And
at least one compound of the formula M
Figure FDA0001846278770000014
Wherein,
R1represents a linear or branched alkyl group having 1 to 12 carbon atoms, 1 or not adjacent 2 or more-CH in the linear or branched alkyl group having 1 to 12 carbon atoms2-may be independently replaced by-C-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively, and one or more-H of said linear or branched alkyl groups containing 1 to 12 carbon atoms may be independently substituted by-F or-Cl, respectively;
RA1and RA2Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms,
Figure FDA0001846278770000015
Figure FDA0001846278770000016
1 or non-adjacent 2 or more-CH in the linear or branched alkyl containing 1 to 12 carbon atoms2-may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively, and one or more-H present in these groups may be independently substituted by-F or-Cl, respectively;
RN1and RN2Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms, 1 or not adjacent 2 or more-CH in the linear or branched alkyl group having 1 to 12 carbon atoms2-may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-;
RM1and RM2Each independently represents-H, a linear or branched alkyl group having 1 to 12 carbon atoms, a linear or branched alkenyl group having 2 to 12 carbon atoms,
Figure FDA0001846278770000021
1 or non-adjacent 2 or more-CH in the linear or branched alkyl containing 1 to 12 carbon atoms2-may be independently replaced by-C.ident.C-, -O-, -CO-O-or-O-CO-;
ring (C)
Figure FDA0001846278770000022
And ring
Figure FDA0001846278770000023
Each independently represent
Figure FDA0001846278770000024
Wherein,
Figure FDA0001846278770000025
one or more-CH2-may be replaced by-O-, one or more of the ring single bonds may be replaced by double bonds,
Figure FDA0001846278770000026
may be substituted by-CN, -F or-Cl, and one or more rings may be substituted by-CH ═ by-N;
ring (C)
Figure FDA0001846278770000027
Ring (C)
Figure FDA0001846278770000028
Ring (C)
Figure FDA0001846278770000029
And ring
Figure FDA00018462787700000210
Each independently represent
Figure FDA00018462787700000211
Wherein,
Figure FDA00018462787700000212
Figure FDA00018462787700000213
one or more-CH2-may be replaced by-O-, one or more of the ring single bonds may be replaced by double bonds,
Figure FDA00018462787700000214
wherein one or more-H may be substituted by-CN, -F or-Cl, and one or more ring-CH may be substituted by-N ═ N;
ring (C)
Figure FDA00018462787700000215
Ring (C)
Figure FDA00018462787700000216
And ring
Figure FDA00018462787700000217
Each independently represent
Figure FDA00018462787700000218
Figure FDA00018462787700000219
Wherein,
Figure FDA00018462787700000220
one or more-CH of2-can be replaced by-O-,
Figure FDA00018462787700000221
at most one-H in (a) may be substituted by halogen;
ring (C)
Figure FDA00018462787700000222
And ring
Figure FDA00018462787700000223
Each independently represent
Figure FDA00018462787700000224
Wherein,
Figure FDA00018462787700000225
one or more-CH2-may be replaced by-O-, one or at most two of the ring bonds in the single bond may be replaced by a double bond,
Figure FDA00018462787700000226
wherein one or more-H may be substituted by-F or-Cl, and one or more ring-CH-may be replaced by-N;
Z1、Z2and Z3Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH2O-or-OCH2-；
ZA11Represents a single bond, -CH2CH2-、-CF2CF2-、-CF2O-、-OCF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-C≡C-、-CF＝CF-、-CH2O-or-OCH2-；
ZA21And ZA22Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-C≡C-、-CF＝CF-、-CH2O-or-OCH2-；
ZM1And ZM2Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-or- (CH)2)4-；
ZN1And ZN2Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-(CH2)4-、-CF2O-、-OCF2-or-CF2CF2-；
L1、L2、L3And L4Each independently represents-H-CH3Or halogen;
x represents halogen, haloalkyl or haloalkoxy having 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy having 2 to 5 carbon atoms;
n1 and n2 each independently represent 0, 1 or 2, and 0. ltoreq. n1+ n 2. ltoreq.3, and when n 1. ltoreq.2, the ring
Figure FDA0001846278770000031
May be the same or different, Z1Which may be the same or different, when n2 is 2, the ring
Figure FDA0001846278770000032
May be the same or different, Z2May be the same or different;
LA11、LA12、LA13、LA21、LA22、LA23and LA24Each independently represents-H, -F, -CH3or-Cl;
XA1and XA2Each independently represents halogen, haloalkyl or haloalkoxy having 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy having 2 to 5 carbon atoms;
nA1and nA2Each independently represents 0, 1, 2 or 3, when nA1When 2 or 3, ring
Figure FDA0001846278770000033
May be the same or different, ZA11May be the same or different, and when n isA2When 2 or 3, ring
Figure FDA0001846278770000034
May be the same or different, ZA21May be the same or different;
nM1represents 0, 1, 2 or 3, and when nM1When 2 or 3, ring
Figure FDA0001846278770000035
May be the same or different, ZM2Can be the sameOr different;
nN1represents 0, 1, 2 or 3, nN2Represents 0 or 1, and 0. ltoreq. nN1+nN2Less than or equal to 3, when n isN1When 2 or 3, ring
Figure FDA0001846278770000036
May be the same or different, ZN1May be the same or different;
when Z isA21And ZA22All represent a single bond and nA2When 1, a ring
Figure FDA0001846278770000037
And ring
Figure FDA0001846278770000038
Is not simultaneously represented
Figure FDA0001846278770000039
When Z is1、Z2And Z3Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH2O-or-OCH2-when 2. ltoreq. n1+ n 2. ltoreq.3; and is
When the ring
Figure FDA00018462787700000310
And ring
Figure FDA00018462787700000311
Is one of
Figure FDA00018462787700000312
When n is greater than nA2Represents 1.
2. The liquid crystal composition of claim 1, wherein the ring is
Figure FDA00018462787700000313
And ring
Figure FDA00018462787700000314
Each independently represent
Figure FDA00018462787700000315
Figure FDA00018462787700000316
3. Liquid crystal composition according to claim 1 or 2, characterized in that the compound of general formula i is selected from the group consisting of:
Figure FDA0001846278770000041
wherein,
L5represents-H or-F;
Rxand RyEach independently represents-CH2-or-O-; and is
n1 represents 0 or 1.
4. The liquid crystal composition of claim 1, wherein the compound of formula i is present in an amount of 0.1% to 60% by weight of the liquid crystal composition.
5. The liquid crystal composition of claim 1, wherein R isA1And RA2Each independently represents a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 8 carbon atoms.
6. The liquid crystal composition of claim 1, wherein the ring is
Figure FDA0001846278770000051
Ring (C)
Figure FDA0001846278770000052
Ring (C)
Figure FDA0001846278770000053
And ring
Figure FDA0001846278770000054
Each independently represent
Figure FDA0001846278770000055
Figure FDA0001846278770000056
7. The liquid crystal composition of claim 1, wherein the compound of formula ii-1 and/or formula ii-2 is present in an amount of 1% to 75% by weight of the liquid crystal composition.
8. The liquid crystal composition of claim 1, wherein R isN1And RN2Each independently represents a linear or branched alkyl or alkoxy group having 1 to 8 carbon atoms, a linear or branched alkenyl or alkenyloxy group having 2 to 8 carbon atoms; ring (C)
Figure FDA0001846278770000057
And ring
Figure FDA0001846278770000058
Each independently represent
Figure FDA0001846278770000059
Figure FDA00018462787700000510
9. Liquid crystal composition according to claim 1 or 8, characterized in that the compound of general formula N is selected from the group consisting of:
Figure FDA00018462787700000511
Figure FDA0001846278770000061
Figure FDA0001846278770000071
10. the liquid crystal composition of claim 1, wherein the compound of formula N is present in an amount of 0.1% to 50% by weight of the liquid crystal composition.
11. The liquid crystal composition of claim 1, wherein the compound of formula M is selected from the group consisting of:
Figure FDA0001846278770000072
Figure FDA0001846278770000081
12. the liquid crystal composition of claim 11, wherein the compound of formula M is present in an amount of 1% to 80% by weight of the liquid crystal composition.
13. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 12.
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