CN111117659A - Liquid crystal composition and display device thereof - Google Patents

Liquid crystal composition and display device thereof Download PDF

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Publication number
CN111117659A
CN111117659A CN201811272289.7A CN201811272289A CN111117659A CN 111117659 A CN111117659 A CN 111117659A CN 201811272289 A CN201811272289 A CN 201811272289A CN 111117659 A CN111117659 A CN 111117659A
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liquid crystal
formula
crystal composition
compound
compounds
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徐海彬
朱贝贝
贺笛
陈前丽
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Jiangsu Hecheng Display Technology Co Ltd
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Jiangsu Hecheng Display Technology Co Ltd
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Priority to KR1020190115198A priority patent/KR102236278B1/en
Priority to TW108138166A priority patent/TWI759641B/en
Publication of CN111117659A publication Critical patent/CN111117659A/en
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    • 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
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
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    • C09K19/3001—Cyclohexane rings
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    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
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    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
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    • C09K19/06—Non-steroidal liquid crystal compounds
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    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
    • C09K2019/3016—Cy-Ph-Ph
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    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3066—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers
    • C09K19/3068—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers chain containing -COO- or -OCO- groups
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    • C09K19/3402—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having oxygen as hetero atom
    • C09K2019/3422—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having oxygen as hetero atom the heterocyclic ring being a six-membered ring

Abstract

The invention discloses a liquid crystal composition, which comprises the following components in part by weight: one or more compounds of formula II; one or more compounds of formula M; one or more compounds of formula A-1; and one or more compounds of formula A-2. The invention also discloses a display device containing the liquid crystal composition. The liquid crystal composition provided by the invention has larger optical anisotropy, larger dielectric anisotropy, lower rotational viscosity, better low-temperature storage stability and larger K under the condition of maintaining a proper clearing pointaveThe large values of VHR (initial) and VHR (uv) and VHR (high temperature) (i.e. better reliability) make liquid crystal display devices comprising the liquid crystal composition of the invention have less light scattering and higher contrast, particularly suitable for use in active matrix thin film transistor (AM-TFT) driven liquid crystal display elements.

Description

Liquid crystal composition and display device thereof
Technical Field
The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition and a display device thereof.
Background
Liquid crystal display elements are used in various household appliances such as watches and calculators, measuring instruments, automobile panels, word processors, computers, printers, televisions, and the like. The display mode is classified into PC (phase change), TN (twisted nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), VA (vertical alignment), and the like, according to the type of the display mode. The driving method of the element is classified into a PM (passive matrix) type and an AM (active matrix) type. PM is classified into static (static) and multiplex (multiplex) types. AM is classified into a TFT (thin film transistor), an MIM (metal insulator metal), and the like. The types of TFTs are amorphous silicon (amorphous silicon) and polycrystalline silicon (polysilicon). The latter is classified into a high temperature type and a low temperature type according to a manufacturing process. Liquid crystal display elements are classified into a reflection type using natural light, a transmission type using backlight, and a semi-transmission type using both light sources of natural light and backlight, depending on the type of light source.
In low information content, passive driving is generally used, but as the information content increases, the display size and the number of display paths increase, and the crosstalk and contrast reduction phenomenon become serious, so that Active Matrix (AM) driving is generally used, and Thin Film Transistors (TFTs) are often used for driving at present. In an AM-TFT element, the TFT switching devices are addressed in a two-dimensional grid, charge up the pixel electrodes for a finite time on, and then turn off until they are addressed again in the next cycle. Therefore, between two addressing periods, it is not desirable to change the voltage on the pixel, otherwise the transmittance of the pixel will change, resulting in unstable display. The rate of discharge at a pixel depends on the electrode capacity and the resistivity of the dielectric material between the electrodes. Therefore, the liquid crystal material is required to have higher resistivity, appropriate optical anisotropy Δ n (the Δ n value is generally about 0.08-0.13) and lower threshold voltage, so as to achieve the purposes of reducing driving voltage and reducing power consumption; it is also required to have a low viscosity to meet the demand for a rapid response. Such liquid crystal compositions have been reported in many documents, for example, WO9202597, WO9116398, WO9302153, WO9116399, CN1157005A and the like.
Studies have shown that the most significant factor affecting the contrast of a liquid crystal display element is the light leakage of the liquid crystal material, while the major factor affecting the light leakage is the light Scattering (LC Scattering), which is associated with the average elastic constant KaveThe relationship of (A) is as follows:
Figure BDA0001846268720000011
wherein d represents the cell gap, neDenotes the extraordinary refractive index, and noIndicating the ordinary refractive index. According to the relation, LC Scattering and KaveIn inverse proportion, in increasing 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 LC Scattering, L, is, regardless of the dielectric of the liquid crystal molecules, and of the liquid crystal material itself0The smaller the CR, the more significant the CR will be.
A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can reduce the base voltage value, reduce the driving voltage, and further reduce the power consumption.
The liquid crystal display element containing the liquid crystal composition with the lower threshold voltage can effectively reduce the power consumption of display, and has longer endurance time particularly in consumables, such as portable electronic products like mobile phones, tablet computers and the like. However, for liquid crystal compositions having a lower threshold voltage (generally containing large dielectric polar groups)Cluster) having a low degree of order of liquid crystal molecules and reflecting the degree of order of the liquid crystal moleculesaveThe value also decreases, affecting the light leakage and contrast of the liquid crystal material, which are generally difficult to achieve simultaneously.
The liquid crystal composition with low viscosity can improve the response speed of the liquid crystal display element. When the response speed of the liquid crystal display element is high, it can be applied to animation display. In addition, when the liquid crystal composition is injected into the cell of the liquid crystal display device, the injection time can be shortened, and the workability can be improved.
The prior art discloses a liquid crystal composition with lower power consumption and faster response, such as patent document CN102858918A, but the liquid crystal composition in the prior art has the problems of environmental protection (such as use of chlorine-containing compounds), short service life (such as poor stability to UV or heat), low contrast (such as whitening of a display screen under sunlight), and incapability of simultaneously satisfying the performance balance of proper optical anisotropy, proper dielectric anisotropy, high voltage holding ratio, good UV resistance stability and high temperature stability in liquid crystal televisions, tablet computers, and the like, and cannot simultaneously satisfy all indexes.
From the preparation angle of the liquid crystal material, various performances of the liquid crystal material are mutually influenced by the influence, and other performances may be changed by improving a certain performance index. Therefore, creative efforts are often required to prepare liquid crystal materials having suitable properties in all aspects.
The liquid crystal material is an important component of the liquid crystal display, and the liquid crystal display has great market demand at present, is mostly used in electronic and electric products, but has a short life cycle. The problem of waste pollution naturally exists in a short life cycle, and under the condition that the current green environmental protection problem is increasingly emphasized by various social circles, if the problem can be controlled from a source, namely, an environment-friendly green material is selected in the modulation process of the liquid crystal material, the environmental cost for treating the waste liquid crystal display can be greatly reduced. Therefore, creative labor is often required to prepare the liquid crystal material with proper performance in all aspects and economic, green and environment-friendly properties.
Disclosure of Invention
The purpose of the invention is as follows: in view of the defects of the prior art, the invention aims to provide a novel optical clear liquid with large optical anisotropy, large dielectric anisotropy, low rotational viscosity, good low-temperature storage stability and large K under the condition of maintaining a proper clearing pointaveValues, and larger VHR (initial) and VHR (uv) and VHR (high temperature), i.e. better reliability. 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, the present invention provides a liquid crystal composition comprising:
one or more compounds of the general formula II
Figure BDA0001846268720000031
One or more compounds of the formula M
Figure BDA0001846268720000032
One or more compounds of formula A-1
Figure BDA0001846268720000033
And
one or more compounds of formula A-2
Figure BDA0001846268720000034
Wherein the content of the first and second substances,
R2represents-H, a linear alkyl or alkoxy group containing from 1 to 12 carbon atoms, an alkenyl or alkenyloxy group containing from 2 to 12 carbon atoms;
RM1and RM2Each independently represents-H, a linear or branched alkyl group having 1 to 12 carbon atoms,
Figure BDA0001846268720000035
Figure BDA0001846268720000036
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-;
RA1and RA2Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms,
Figure BDA0001846268720000037
Figure BDA0001846268720000038
1 or non-adjacent 2 or more-CH in the linear or branched alkyl containing 1 to 12 carbon atoms2-said linear or branched alkyl radical containing from 1 to 12 carbon atoms which may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-or-O-CO-, respectively,
Figure BDA0001846268720000039
Each of one or more-H may be independently substituted with-F or-Cl;
ZM1and ZM2Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-or- (CH)2)4-；
ZA11、ZA21And ZA22Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH2O-or-OCH2-；
LA11、LA12、LA13、LA21And LA22Each independently represents-H, an alkyl group containing 1 to 3 carbon atoms or halogen;
XA1and XA2Each independently represents halogen, containsHaloalkyl or haloalkoxy of 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2 to 5 carbon atoms;
ring (C)
Figure BDA0001846268720000041
To represent
Figure BDA0001846268720000042
Ring (C)
Figure BDA0001846268720000043
Ring (C)
Figure BDA0001846268720000044
And ring
Figure BDA0001846268720000045
Each independently represent
Figure BDA0001846268720000046
Figure BDA0001846268720000047
Wherein the content of the first and second substances,
Figure BDA0001846268720000048
one or more-CH of2-can be replaced by-O-,
Figure BDA0001846268720000049
at most one-H in (a) may be substituted by halogen;
ring (C)
Figure BDA00018462687200000410
Ring (C)
Figure BDA00018462687200000411
Ring (C)
Figure BDA00018462687200000412
And ring
Figure BDA00018462687200000413
Each independently represent
Figure BDA00018462687200000414
Wherein the content of the first and second substances,
Figure BDA00018462687200000415
Figure BDA00018462687200000416
one or more-CH2-may be replaced by-O-, one or more of the ring single bonds may be replaced by double bonds,
Figure BDA00018462687200000417
may be substituted by-CN, -F or-Cl, and one or more rings may be substituted by-CH ═ by-N;
a and b each independently represent an integer of 0 to 5;
nM1、nA11and nA2Each independently represents 0, 1, 2 or 3, and when nM1When 2 or 3, ring
Figure BDA00018462687200000418
May be the same or different, ZM2May be the same or different; when n isA11When 2 or 3, ring
Figure BDA00018462687200000419
May be the same or different, ZA11May be the same or different; when n isA2When 2 or 3, ring
Figure BDA00018462687200000420
May be the same or different, ZA21May be the same or different;
nA12represents 1 or 2, and when nA12When 2, ring
Figure BDA00018462687200000421
May be the same or different; and is
The compounds of formula M do not include compounds of formula II.
The weight percentage of the compound of formula II in the liquid crystal composition of the present invention is preferably: the lower limit of the weight percentage of the compound of formula ii in the liquid crystal composition of the present invention is preferably 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 7%, 8%, 9% or 10% relative to the total weight of the liquid crystal composition of the present invention; the upper limit of the weight percentage of the compound of the general formula ii in the liquid crystal composition of the present invention is preferably 50%, 45%, 40%, 35%, 30%, 28%, 27%, 26%, 25.5%, 25%, 24.5%, 24%, 22%, 20%, 18%, 16% or 15% relative to the total weight of the liquid crystal composition of the present invention.
In some embodiments of the invention, the compound of formula II is present in an amount of 0.1% to 50% by weight of the liquid crystal composition.
In some embodiments of the invention, in the compounds of formula ii, a and b each independently represent 0, 1 or 2.
In some embodiments of the invention, in the compounds of formula II, R2Preferably an alkyl or alkoxy group having 1 to 8 carbon atoms, an alkenyl or alkenyloxy group having 2 to 8 carbon atoms; further preferred is an alkyl group or alkoxy group having 1 to 5 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 5 carbon atoms.
In some embodiments of the invention, the compound of formula ii is selected from the group consisting of:
Figure BDA0001846268720000051
wherein the content of the first and second substances,
Lxrepresents-H or-CH3。
In some embodiments of the invention, the compound of formula II is preferably selected from the group consisting of compounds of formulae II-3 and II-4; particular preference is given to compounds selected from the formulae II-4.
In some embodiments of the present invention, the liquid crystal composition preferably comprises at least one compound of formula II-4; particular preference is given to compounds comprising two of the formulae II-4.
In some embodiments of the invention, the liquid crystal composition comprises at least two compounds of formula II, wherein at least one compound of formula II is selected from compounds of formula II-4.
In some embodiments of the invention, the absolute value of the dielectric anisotropy of the compound of formula M is not more than 3; preferably, the absolute value of the dielectric anisotropy of the compound of formula M does not exceed 2.
In some embodiments of the invention, in the compound of formula M, RM1And RM2Each independently preferably a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 9 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms; further preferably a linear alkyl group having 1 to 8 carbon atoms, a linear alkoxy group having 1 to 7 carbon atoms, or a linear alkenyl group having 2 to 8 carbon atoms; still more preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2Each independently represents a straight-chain alkenyl group having 2 to 8 carbon atoms; further preferably, RM1And RM2Each independently represents a straight-chain alkenyl group having 2 to 5 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2One is a linear alkenyl group having 2 to 5 carbon atoms, and the other is a linear alkyl group having 1 to 5 carbon atoms.
In some embodiments of the invention, preferably, RM1And RM2Both are a linear alkyl group having 1 to 8 carbon atoms or a linear alkoxy group having 1 to 7 carbon atoms; further preferably, RM1And RM2Both are a linear alkyl group having 1 to 5 carbon atoms or a linear alkoxy group having 1 to 4 carbon atoms.
In the inventionIn some embodiments of (b), preferably, R isM1And RM2One is a linear alkyl group having 1 to 5 carbon atoms, and the other is a linear alkyl group having 1 to 5 carbon atoms or a linear alkoxy group having 1 to 4 carbon atoms; further preferably, RM1And RM2Both are linear 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 BDA0001846268720000061
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 BDA0001846268720000062
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 BDA0001846268720000071
Figure BDA0001846268720000081
in some embodiments of the present invention, the content of the compound of formula M must be appropriately adjusted depending on the desired properties of solubility at low temperatures, transition temperature, electrical reliability, birefringence, process adaptability, dripping 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 is 0.1%, 1%, 10%, 20%, 30%, 40% or 50% relative to the total weight of the liquid crystal composition of the present invention; the upper limit of the preferred weight percentage of the compound of formula M in the liquid crystal composition of the present invention is 90%, 85%, 80%, 75%, 70%, 65%, 60%, 55%, 50%, 45%, 35% or 25% relative to the total weight of the liquid crystal composition of the present invention.
In some embodiments of the present invention, the compound of formula M is present in an amount of 0.1% to 90% by weight of the liquid crystal composition.
The content of the compound of the formula M is preferably higher in the lower limit value and higher in the upper limit value when the viscosity of the liquid crystal composition of the present invention needs to be kept low and the response time is short; when the liquid crystal composition of the present invention is required to have a high clearing point and good temperature stability, the lower limit value and the upper limit value are preferably high; in order to keep the driving voltage low and increase the absolute value of the dielectric anisotropy, it is preferable to lower the lower limit and lower the upper limit.
In some embodiments of the invention, R is preferred where reliability is a concernM1And RM2Are all alkyl; in the case where importance is attached to reduction in volatility of the compound, R is preferablyM1And RM2Are both alkoxy groups; when importance is attached to the reduction in viscosity, R is preferably usedM1And RM2At least one of which is alkenyl.
In some embodiments of the present invention, the compound of formula M is particularly preferably selected from the group consisting of compounds of formula M1, formula M2, formula M3, formula M4, formula M7, formula M8, formula M9, formula M10, formula M11, formula M13, formula M15, formula M16, formula M17, formula M18, formula M19, formula M20, formula M21, formula M22, formula M23 and formula M24.
In some embodiments of the invention, the compound of formula M is preferably selected from the group consisting of compounds of formula M1, formula M4, formula M9, formula M13, and formula M20.
In some embodiments of the invention, in the compound of formula M1, RM1Represents a straight-chain 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.
Preference with respect to the compounds of the formula M1 in weight percent of the liquid crystal composition of the invention: 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%, 3%, 5%, 7%, 10%, 13%, 15%, 17%, 20%, 23%, 25% or 30%; the preferred upper 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 60%, 55%, 50%, 45%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13% or 10%.
In order to improve in particular the response times of the liquid-crystal compositions according to the invention, preference is given to R in the compounds of the formula M1M1Is ethyl, n-propyl, butyl or pentyl, and RM2A compound of the formula M1, wherein R is methyl or methoxyM1Is ethyl, n-propyl, butyl or pentyl, and RM2Compounds which are ethyl or ethoxy, or compounds of the formula M1 in which R isM1Is n-propyl, butyl or pentyl, and RM2A compound that is n-propyl or propoxy.
R in the compound of formula M1 relative to the total weight of the liquid crystal composition of the inventionM1Is n-propyl and RM2The preferred lower limit of the weight percentage of the compound which is an ethyl group in the liquid crystal composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; r in the formula M1 relative to the total weight of the liquid crystal composition of the present inventionM1Is n-propyl and RM2The preferred weight percentage of the compound which is ethyl in the liquid crystal composition of the present inventionThe upper limit 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 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 M4 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M4 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% or 10%; the upper limit of the preferred weight percentage of the compound of formula M4 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 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 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 present invention, it is preferable to contain R in the compound of the formula M9 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 CH3-said compound having a linear or branched chain of 2 to 4 carbon atomsFurther preferred is alkenyl of (2)
Figure BDA0001846268720000101
R in the compound of formula M9 relative to the total weight of the liquid crystal composition of the inventionM1Is composed of
Figure BDA0001846268720000102
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 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 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 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% or 9%, with respect to the total weight of the liquid crystal composition of the present invention.
The weight percentage of the compound of formula M10 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M10 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%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; the preferred upper limit value of the weight percentage of the compound of formula M10 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 45%, 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 M10 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 BDA0001846268720000111
R in the compound of formula M10 relative to the total weight of the liquid crystal composition of the inventionM1Is composed of
Figure BDA0001846268720000112
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 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 both 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 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% 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 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 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 RM1Is n-propyl or n-pentyl, and RM2Is C2H5A compound of (a), or preferably RM1Is composed of
Figure BDA0001846268720000113
And R isM2A compound which is an n-propyl group,or preferably RM1Is n-propyl, n-butyl or n-pentyl, and RM2Is CH3A compound of O-; particular preference is given to RM1Is n-propyl and RM2Is C2H5-a compound of (a).
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 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 M13 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 M13 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 BDA0001846268720000114
Figure BDA0001846268720000115
And the other is CH3-or C2H5-a compound of (a).
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 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 compound of formula M16 in the liquid crystal composition of the invention is preferably: the preferred lower limit of the weight percentage of the compound of formula M16 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%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; the upper limit of the preferred weight percentage of the compound of formula M16 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 M20 to M24 in the liquid crystal composition of the present invention is preferably: the preferred lower limit of the percentage of the compounds of formulae M20 to M24 based on the total weight of the liquid crystal composition of the invention is 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16% or 20%; the preferred upper limit of the percentage of the compounds of formulae M20 to M24 based on the total weight of the liquid crystal composition of the invention is 30%, 25%, 23%, 20%, 18%, 15%, 12%, 10% or 5%.
In some embodiments of the invention, the compound of formula A-1 is selected from the group consisting of:
Figure BDA0001846268720000121
Figure BDA0001846268720000131
Figure BDA0001846268720000141
wherein the content of the first and second substances,
RA1represents a straight-chain or branched alkyl group having 1 to 8 carbon atoms,
Figure BDA0001846268720000142
1 or non-adjacent 2 or more-CH in the linear or branched alkyl group containing 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;
Rvand RwEach independently represents-CH2-or-O-;
LA11、LA12、LA11’、LA12’、LA14、LA15and LA16Each independently represents-H or-F;
LA13and LA13' independently of each other represents-H or-CH3；
XA1represents-F, -CF3or-OCF3(ii) a And is
v and w each independently represent 0 or 1.
The weight percentage of the compound of formula A-1 to the liquid crystal composition of the present invention is preferably: the preferred lower limit of the weight percentage of the compound of formula a-1 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 15%, 17%, 18% or 20%; the preferred upper limit value of the weight percentage of the compound of the general formula a-1 to the liquid crystal composition of the present invention is 80%, 75%, 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25% relative to the total weight of the liquid crystal composition of the present invention.
In some embodiments of the present invention, the compound of formula A-1 comprises 0.1% to 80% by weight of the liquid crystal composition.
The preferable content of the compound of the general formula A-1 is preferably such that the lower limit value is slightly lower and the upper limit value is slightly lower, when the viscosity of the liquid crystal composition of the present invention is kept low and the response speed is high; further, when the clearing point of the liquid crystal composition of the present invention is kept high and the temperature stability is good, it is preferable to make the lower limit value slightly lower and the upper limit value slightly lower; in order to increase the absolute value of the dielectric anisotropy while keeping the driving voltage low, it is preferable to increase the lower limit and the upper limit slightly.
In some embodiments of the present invention, the compound of formula A-1 is preferably selected from the group consisting of compounds of formula A-1-1, formula A-1-4, formula A-1-7, formula A-1-13, formula A-1-14, formula A-1-15, formula A-1-16, and formula A-1-17.
In some embodiments of the invention, the compound of formula a-2 is selected from the group consisting of:
Figure BDA0001846268720000151
Figure BDA0001846268720000161
wherein the content of the first and second substances,
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;
LA21、LA22、LA23、LA24and LA25Each independently represents-H or-F; and is
XA21represents-F, -CF3、-OCF3or-CH2CH2CH＝CF2。
The weight percentage of the compound of formula A-2 to the liquid crystal composition of the present invention is preferably: the preferred lower limit of the weight percentage of the compound of formula a-2 in the liquid crystal composition of the invention relative to the total weight of the liquid crystal composition of the invention is 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 15%, 17%, 18% or 20%; the preferred upper limit of the weight percentage of the compound of formula a-2 to the liquid crystal composition of the invention is 80%, 75%, 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 A-2 comprises 0.1% to 80% by weight of the liquid crystal composition.
The preferable content of the compound of the general formula a-2 is preferably such that the lower limit value is slightly lower and the upper limit value is slightly lower, when the viscosity of the liquid crystal composition of the present invention is kept low and the response speed is high; further, when the clearing point of the liquid crystal composition of the present invention is kept high and the temperature stability is good, it is preferable to make the lower limit value slightly lower and the upper limit value slightly lower; in order to increase the absolute value of the dielectric anisotropy while keeping the driving voltage low, it is preferable to increase the lower limit and the upper limit slightly.
In some embodiments of the present invention, the compound of formula A-2 is preferably selected from the group consisting of compounds of formula A-2-4, formula A-2-8, formula A-2-11, and formula A-2-12.
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 BDA0001846268720000171
Figure BDA0001846268720000181
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 BDA0001846268720000182
Figure BDA0001846268720000191
Figure BDA0001846268720000201
Figure BDA0001846268720000211
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 BDA0001846268720000212
Figure BDA0001846268720000221
in some embodiments of the present invention, preferably, the light stabilizer is 0 to 5% by weight of the total liquid crystal composition; more preferably, the light stabilizer is 0-1% by weight of the total liquid crystal composition; particularly preferably, the light stabilizer is 0.01 to 0.1% by weight of the total liquid crystal composition.
In another aspect, the invention further provides a liquid crystal display device comprising the liquid crystal composition provided by the invention.
Has the advantages that:
the liquid crystal composition provided by the invention has larger light under the condition of maintaining proper clearing pointChemical anisotropy, larger dielectric anisotropy, lower rotational viscosity, better low-temperature storage stability and larger KaveThe large values of VHR (initial) and VHR (uv) and VHR (high temperature) (i.e. better reliability) make liquid crystal display devices comprising the liquid crystal composition of the invention have less light scattering and higher contrast, particularly suitable for use in active matrix thin film transistor (AM-TFT) driven liquid crystal display elements.
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.
In the present invention, the proportions are by weight and all temperatures are in degrees centigrade, unless otherwise specified.
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 BDA0001846268720000222
Figure BDA0001846268720000231
Compounds of the following formula are exemplified:
Figure BDA0001846268720000232
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.)
ε⊥Dielectric constant in the direction perpendicular to the molecular axis
Delta epsilon dielectric anisotropy (1KHz, 25 ℃ C.)
Gamma.1 rotational viscosity (mPas, 25 ℃ C., unless otherwise stated)
K11Elasticity constant of splay
K22Torsional elastic constant
K33Flexural elastic constant
KaveAverage elastic constant
LTS Low temperature storage stability (C, temperature for 500h storage without crystallization)
VHR (initial) initial Voltage holding ratio (%)
Voltage holding ratio (%) after VHR (UV) UV light irradiation
Voltage holding ratio after 1 hour at VHR (high temperature) 150 ℃ at high temperature (%)
Wherein the content of the first and second substances,
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.
Gamma 1 is obtained by testing a TOYO6254 type liquid crystal physical property evaluation system; the test temperature was 25 ℃, the test voltage was 90V, and the thickness of the test cell was 20 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: 7 μm antiparallel rubbing cell, V ═0.1～20V；
Figure BDA0001846268720000241
VHR (initial) was tested using the TOY06254 type liquid crystal physical property evaluation system; the test temperature was 60 ℃, the test voltage was 5V, the test frequency was 6Hz, and the thickness of the test cell was 9 μm.
VHR (UV) was tested using TOY06254 type liquid crystal physical property evaluation system; the used wavelength is 365nm, and the energy is 6000mJ/cm2The liquid crystal material is irradiated by the UV light and then tested, the testing temperature is 60 ℃, the testing voltage is 5V, the testing frequency is 6Hz, and the thickness of the testing box is 9 μm.
VHR (high temperature) was tested using a TOY06254 type liquid crystal physical property evaluation system; the liquid crystal material was kept at 150 ℃ for 1 hour at a high temperature and then tested at 60 ℃ under a test voltage of 5V at a test frequency of 6Hz and a cell thickness of 9 μm.
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 with each compound and weight percentage as listed in table 2, and the test data are shown in the following table:
TABLE 2 liquid crystal composition formulations and their test properties
Figure BDA0001846268720000251
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, and the test data are shown in the following table:
TABLE 3 liquid crystal composition formula and its test performance
Figure BDA0001846268720000252
Figure BDA0001846268720000261
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, and the test data are shown in the following table:
TABLE 4 liquid crystal composition formula and its test performance
Figure BDA0001846268720000262
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, and the test data are shown in the following table:
TABLE 5 liquid crystal composition formulations and their test properties
Figure BDA0001846268720000271
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, and the test data are shown in the following table:
TABLE 6 liquid crystal composition formula and its test performance
Figure BDA0001846268720000272
Figure BDA0001846268720000281
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, and the test data are shown in the following table:
TABLE 7 liquid crystal composition formulations and their test properties
Figure BDA0001846268720000282
In order to highlight the beneficial effects of the liquid crystal composition of the present invention, the inventors selected a comparative example similar to the example system of the present invention. As can be seen from the above comparative example 1 and examples 1 to 5, the liquid crystal composition provided by the present invention has a large optical anisotropy, a large dielectric anisotropy, a low rotational viscosity, a good low-temperature storage stability, a large K, while maintaining a suitable clearing pointaveThe large values of VHR (initial) and VHR (uv) and VHR (high temperature) (i.e. better reliability) make liquid crystal display devices comprising the liquid crystal composition of the invention have less light scattering and higher contrast, particularly suitable for use in active matrix thin film transistor (AM-TFT) driven liquid crystal display elements.
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 (14)

1. A liquid crystal composition, comprising:
one or more compounds of the general formula II
Figure FDA0001846268710000011
One or more compounds of the formula M
Figure FDA0001846268710000012
One or more compounds of formula A-1
Figure FDA0001846268710000013
And one or more compounds of the formula A-2
Figure FDA0001846268710000014
Wherein the content of the first and second substances,
R2represents-H, a linear alkyl or alkoxy group containing from 1 to 12 carbon atoms, an alkenyl or alkenyloxy group containing from 2 to 12 carbon atoms;
RM1and RM2Each independently represents-H, a linear or branched alkyl group having 1 to 12 carbon atoms,
Figure FDA0001846268710000015
Figure FDA0001846268710000016
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-;
RA1and RA2Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms,
Figure FDA0001846268710000017
Figure FDA0001846268710000018
1 or non-adjacent 2 or more-CH in the linear or branched alkyl containing 1 to 12 carbon atoms2-said linear or branched alkyl radical containing from 1 to 12 carbon atoms which may be independently replaced by-CH ═ CH-, -C ≡ C-, -O-, -CO-O-or-O-CO-, respectively,
Figure FDA0001846268710000019
Each of one or more-H may be independently substituted with-F or-Cl;
ZM1and ZM2Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-or- (CH)2)4-；
ZA11、ZA21And ZA22Each independently represents a single bond, -CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH2O-or-OCH2-；
LA11、LA12、LA13、LA21And LA22Each independently represents-H, an alkyl group containing 1 to 3 carbon atoms or halogen;
XA1and XA2Each independently represents halogen, haloalkyl or haloalkoxy having 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy having 2 to 5 carbon atoms;
ring (C)
Figure FDA0001846268710000021
To represent
Figure FDA0001846268710000022
Ring (C)
Figure FDA0001846268710000023
Ring (C)
Figure FDA0001846268710000024
And ring
Figure FDA0001846268710000025
Each independently represent
Figure FDA0001846268710000026
Figure FDA0001846268710000027
Wherein the content of the first and second substances,
Figure FDA0001846268710000028
one or more-CH of2-can be replaced by-O-,
Figure FDA0001846268710000029
at most one-H in (a) may be substituted by halogen;
ring (C)
Figure FDA00018462687100000210
Ring (C)
Figure FDA00018462687100000211
Ring (C)
Figure FDA00018462687100000212
And ring
Figure FDA00018462687100000213
Each independently represent
Figure FDA00018462687100000214
Wherein the content of the first and second substances,
Figure FDA00018462687100000215
Figure FDA00018462687100000216
one or more-CH2-may be replaced by-O-, one or more of the ring single bonds may be replaced by double bonds,
Figure FDA00018462687100000217
may be substituted by-CN, -F or-Cl, and one or more rings may be substituted by-CH ═ by-N;
a and b each independently represent an integer of 0 to 5;
nM1、nA11and nA2Each independently represents 0, 1, 2 or 3, and when nM1When 2 or 3, ring
Figure FDA00018462687100000218
May be the same or different, ZM2May be the same or different; when n isA11When 2 or 3, ring
Figure FDA00018462687100000219
May be the same or different, ZA11May be the same or different; when n isA2When 2 or 3, ring
Figure FDA00018462687100000220
May be the same or different, ZA21May be the same or different;
nA12represents 1 or 2, and when nA12When 2, ring
Figure FDA00018462687100000221
May be the same or different; and is
The compounds of the general formula II are not included in the compounds of the general formula M.
2. The liquid crystal composition of claim 1, wherein the compound of formula ii is present in an amount of 0.1% to 50% by weight of the liquid crystal composition.
3. Liquid crystal composition according to claim 1 or 2, characterized in that the compound of general formula ii is selected from the group consisting of:
Figure FDA00018462687100000222
Figure FDA0001846268710000031
wherein the content of the first and second substances,
Lxrepresents-H or-CH3。
4. Liquid crystal composition according to claim 3, characterized in that the compound of formula II is preferably selected from the group consisting of the compounds of formula II-3 and the compounds of formula II-4.
5. The liquid crystal composition of claim 4, wherein the liquid crystal composition comprises at least one compound of formula II-4.
6. The liquid crystal composition of claim 5, wherein the liquid crystal composition comprises at least two compounds of formula II, wherein at least one compound of formula II is selected from the group consisting of compounds of formula II-4.
7. The liquid crystal composition of claim 6, wherein the liquid crystal composition comprises at least two compounds of formula II-4.
8. The liquid crystal composition of claim 1, wherein the compound of formula M is selected from the group consisting of:
Figure FDA0001846268710000032
Figure FDA0001846268710000041
Figure FDA0001846268710000051
9. the liquid crystal composition according to any one of claims 1 or 8, wherein the compound of formula M is present in an amount of 0.1% to 90% by weight of the liquid crystal composition.
10. The liquid crystal composition of claim 1, wherein the compound of formula a-1 is selected from the group consisting of:
Figure FDA0001846268710000052
Figure FDA0001846268710000061
Figure FDA0001846268710000071
wherein the content of the first and second substances,
RA1represents a straight-chain or branched alkyl group having 1 to 8 carbon atoms,
Figure FDA0001846268710000072
1 or non-adjacent 2 or more-CH in the linear or branched alkyl group containing 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;
Rvand RwEach independently represents-CH2-or-O-;
LA11、LA12、LA11’、LA12’、LA14、LA15and LA16Each independently represents-H or-F;
LA13and LA13' independently of each other represents-H or-CH3；
XA1represents-F, -CF3or-OCF3(ii) a And is
v and w each independently represent 0 or 1.
11. The liquid crystal composition of claim 1 or 10, wherein the compound of formula a-1 is present in an amount of 0.1% to 80% by weight of the liquid crystal composition.
12. The liquid crystal composition of claim 1, wherein the compound of formula a-2 is selected from the group consisting of:
Figure FDA0001846268710000073
Figure FDA0001846268710000081
wherein the content of the first and second substances,
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;
LA21、LA22、LA23、LA24and LA25Each independently represents-H or-F; and is
XA2represents-F, -CF3、-OCF3or-CH2CH2CH＝CF2。
13. The liquid crystal composition of claim 1 or 12, wherein the compound of formula a-2 is present in an amount of 0.1% to 80% by weight of the liquid crystal composition.
14. A display device comprising the liquid crystal composition according to any one of claims 1 to 13.
CN201811272289.7A 2018-10-30 2018-10-30 Liquid crystal composition and display device thereof Pending CN111117659A (en)

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