CN112824492B

CN112824492B - Liquid crystal composition and application thereof

Info

Publication number: CN112824492B
Application number: CN201911150216.5A
Authority: CN
Inventors: 姚利芳; 徐海彬; 陈诺; 丁文全; 徐爽
Original assignee: Jiangsu Hecheng Display Technology Co Ltd
Current assignee: Jiangsu Hecheng Display Technology Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2022-12-30
Anticipated expiration: 2039-11-21
Also published as: KR102500487B1; CN112824492A; KR20210063267A

Abstract

The invention relates to a liquid crystal composition and application thereof, and a liquid crystalThe composition comprises at least one compound of formula I, and at least one compound of formula II-1 and/or at least one compound of formula II-2; the liquid crystal composition has proper optical anisotropy and dielectric anisotropy, higher clearing point, lower rotational viscosity and higher K _ave On the premise of the value, the VHR-initial and low-temperature storage performance can be maintained at a stable level, the conductivity I/V value is remarkably lower, the ion dissipation speed is higher, the occurrence of the ghost shadow of the liquid crystal panel can be effectively improved, and the reliability is higher.

Description

Liquid crystal composition and application thereof

Technical Field

The invention belongs to the technical field of liquid crystal materials, and relates to a liquid crystal composition and application thereof.

Background

Liquid Crystal Displays (LCDs) are used in many fields to display information, and are used for direct view displays and projection type displays. As the photoelectric mode, for example, twisted Nematic (TN), super Twisted Nematic (STN), optically Compensated Bend (OCB), electrically Controlled Birefringence (ECB), various variations thereof, and the like are used. All these modes utilize an electric field which is substantially perpendicular to the substrate or the liquid crystal layer, and in addition to these modes, there are electro-optical modes utilizing an electric field which is substantially parallel to the substrate or the liquid crystal layer, such as an in-plane switching (IPS) mode and a Fringe Field Switching (FFS) mode, in which there are strong so-called "fringe fields", i.e., a strong electric field near the edges of the electrodes and an electric field in the entire cell which has a strong vertical component and a strong horizontal component. The latter two electro-optical modes are particularly useful for LCDs in modern desktop monitors and are intended for television displays and multimedia applications. The liquid crystal according to the invention is preferably used in this type of display. In general, liquid-crystalline media having a dielectric anisotropy of only about 3 or even less are sometimes also used in FFS displays.

For these displays, new liquid-crystalline media with improved properties are required. In particular, the addressing time must be improved for many application types. Liquid-crystalline media having a low viscosity, in particular having a low rotational viscosity, are therefore required. In particular for monitor applications, the rotational viscosity should be 80 mPas or less, preferably 60 mPas or less and in particular 55 mPas or less. In addition to these parameters, the medium must have a nematic phase range of suitable width and position, and suitable birefringence. The dielectric anisotropy should also be high enough to enable a relatively low operating voltage. Preferably, the dielectric anisotropy should be higher than 2, very preferably higher than 3, however preferably not higher than 20, in particular not higher than 17, since this would avoid at least a relatively high resistivity.

For notebook computer display applications or other mobile applications, the rotation year should preferably be 120mPa · s or less, particularly preferably 100mPa · s or less. The dielectric anisotropy should preferably be greater than 8, in particular greater than 12.

The liquid crystal material used for the liquid crystal display is required to have the following characteristics: (1) low driving voltage: the liquid crystal material has proper dielectric anisotropy; (2) fast response: the liquid crystal material has an appropriate optical anisotropy (3): high reliability: the high-voltage-holding-ratio UV-resistant coating has high voltage holding ratio, high ion dissipation speed, high specific resistance value, excellent high-temperature-resistant stability and excellent UV resistance; however, when the liquid crystal material achieves the basic characteristics (low driving and fast response) required by the liquid crystal display, the reliability problem becomes more prominent, and especially the high temperature resistance (afterimage appears at high temperature) becomes worse;

because of the sensitivity of liquid crystal materials to ultraviolet rays, finished liquid crystals generally need to be matched with additives with an anti-UV function, and the most widely applied additives are hindered amine light stabilizers. The hindered amine compound has good physical and chemical stability and excellent UV tolerance as an ultraviolet absorbent of liquid crystal, but the known hindered amine compound has the problem of poor compatibility after being mixed and dissolved with a liquid crystal material, and particularly when the hindered amine compound is applied to a low-temperature environment, a solid is often precipitated.

Therefore, it is an urgent problem to develop a liquid crystal material having both low temperature stability and performance reliability.

Disclosure of Invention

In view of the deficiencies of the prior art, it is an object of the present invention to provide a liquid crystal composition. The liquid crystal composition can have low-temperature stability and performance reliability, and is suitable for various liquid crystal display modes.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a liquid crystal composition, which comprises at least one compound shown in a general formula I, and at least one compound shown in a general formula II-1 and/or at least one compound shown in a general formula II-2;

said r represents 2, 3 or 4;

sp represents a straight or branched chain alkylene group having 1 to 15 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, etc.) carbon atoms, a cycloalkyl or aromatic hydrocarbon group having 3 to 7 (e.g., 4, 5, 6, etc.) carbon atoms, or at least one-CH group of a straight or branched chain alkylene group having 1 to 15 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, etc.) carbon atoms ₂ -substituted by-O-, -CO-or-NH-, containing 3 to 7 (e.g. 4) 5, 6, etc.) carbon atoms, at least one-CH in a cycloalkyl or an aromatic hydrocarbon radical ₂ CH ₂ -a group substituted with-CH = CH-or-C ≡ C-, or a group in which at least two of the above groups are linked, and the valence of Sp is the same as the number represented by r;

sp may be selected from the group consisting of at least two of the above groups, and may be exemplified by a group comprising a straight chain alkylene group and a cycloalkyl group, for example

Or may be selected from one-CH of linear alkylene ₂ Groups formed by bonding of radicals substituted by-CO-with aromatic hydrocarbon radicals, e.g.

The dotted line represents the access bond of the group;

wherein, the aromatic hydrocarbon group refers to a hydrocarbon group containing a benzene ring, including but not limited to

Etc., the dotted line represents the access bond of the group;

the R is _N represents-H, -OH, an alkyl group containing 1-15 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, etc.) carbon atoms, or at least one-CH in an alkyl group containing 1-15 carbon atoms ₂ -substituted by-O-, -CO-or-NH-;

said Y ₁ -Y ₄ Each independently represents H or an alkyl group containing 1 to 4 (e.g. 2 or 3) carbon atoms;

said R is _A1 And R _A2 Each independently represents a straight or branched alkyl group having 1 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc.) carbon atoms,

Or

Or 1 or 2 or more-CH which is not adjacent to 1 or 2 of a linear or branched alkyl group having 1 to 12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc.) carbon atoms ₂ -each independently is substituted with-CH = CH-, -C ≡ C-, -O-) -CO-, -CO-O-or-O-CO-substituted radicals, or a linear or branched alkyl group having 1 to 12 carbon atoms,

Or

Or at least two of-H are each independently substituted with-F or-Cl;

in the present invention, like

Or

Such groups without a specific access site are those wherein the line drawn represents the access site and not a methyl group;

z is _A11 、Z _A21 And Z _A22 Each independently represents a single bond, -CH ₂ CH ₂ -、-CF ₂ CF ₂ -、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH ₂ O-or-OCH ₂ Any one of the above-mentioned;

said X _A1 And X _A2 Each independently represents any one of halogen, haloalkyl containing 1 to 5 (e.g., 2, 3, 4, etc.) carbon atoms, haloalkoxy containing 1 to 5 (e.g., 2, 3, 4, etc.) carbon atoms, haloalkenyl containing 2 to 5 (e.g., 2, 3, 4, etc.) carbon atoms, or haloalkenyloxy containing 2 to 5 (e.g., 2, 3, 4, etc.) carbon atoms;

the ring

Ring(s)

Ring (C)

And ring

Each independently of the otherGround representation

Or

Or

And

of one or at least two-CH ₂ -substituted by-O-, or

And

a group in which one or at least two single bonds are replaced by a double bond, or

And

or at least two of-H are substituted by-CN, -F or-Cl, or

And

or at least two of-CH = groups substituted by-N =;

n is _A11 And n _A2 Each independently represents 0, 1, 2 or 3, and when n _A11 When =2 or 3, ring

Same or different, Z _A11 The same or different; when n is _A2 When =2 or 3, a ring

Same or different, Z _A21 The same or different;

n is _A12

Represents

1 or 2, and when n _A12 When =2, ring

The same or different;

said L _A11 、L _A12 、L _A13 、L _A21 And L _A22 Each independently represents-H, -F or-CH ₃ Any one of them.

The additive shown in the general formula I is added into the liquid crystal composition, and the additive and the positive liquid crystal compound shown in the general formula II-1 and/or the general formula II-2 have synergistic effect, so that the obtained liquid crystal composition has proper optical anisotropy and dielectric anisotropy, higher clearing point, lower rotational viscosity and higher K _ave On the premise of the value, the VHR-initial and low-temperature storage performance can be maintained at a stable level, the conductivity I/V value is remarkably lower, the ion dissipation speed is higher, the occurrence of the ghost shadow of the liquid crystal panel can be effectively improved, and the reliability is higher.

Preferably, the compound of the general formula I is any one of compounds having the following structures or a combination of at least two of the compounds:

t is an integer of 1 to 11, such as 2, 3, 4, 5, 6, 7, 8, 9, 10, etc.;

said R is _N Have the same meaning as in formula I.

Preferably, said R is _N represents-H or an alkyl group having 1 to 8 carbon atoms.

Said Y is ₁ 、Y ₂ 、Y ₃ 、Y ₄ Are all methyl.

Preferably, the liquid crystal composition contains the compound of formula I in an amount of 50 to 5000ppm, for example, 60ppm, 100ppm, 500ppm, 1000ppm, 1500ppm, 2000ppm, 2500ppm, 3000ppm, 3500ppm, 4000ppm, 4500ppm, 4800ppm, etc., preferably 100 to 4000ppm, more preferably 100 to 3000ppm, still more preferably 200 to 1000ppm.

Preferably, the compound of formula II-1 is any one of or a combination of at least two of the compounds having the following structures:

the R is _A1 Represents a straight-chain or branched alkyl group having 1 to 8 carbon atoms,

Or

Or 1 or non-adjacent 2 or more-CH in a linear or branched alkyl group having 1 to 8 carbon atoms ₂ -radicals each independently of the others replaced by-CH = CH-, -C ≡ C-, -O-, -CO-O-or-O-CO-, or said straight or branched alkyl radical containing 1 to 8 carbon atoms,

Or

Or at least two of-H are each independently substituted with-F or-Cl;

the R is _v And R _w Each independently represents-CH ₂ -or-O-;

v and w each independently represent 0 or 1;

said L _A11 、L _A12 、L _A11 '、L _A12 '、L _A14 、L _A15 And L _A16 Each independently represents-H or-F;

said L _A13 And L _A13 ' independently of each other represents-H or-CH ₃ ；

Said X _A1 represents-F, -CF ₃ or-OCF ₃ 。

Preferably, the compound of formula II-2 is any one of or a combination of at least two of the compounds having the following structures:

said R is _A2 Represents a straight chain or branched alkyl group having 1 to 8 carbon atoms or a straight chain or branched alkyl group having 1 to 8 carbon atoms, wherein the alkyl group is not adjacent to 1 or 2 or more-CH ₂ -each independently substituted with-CH = CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, or a group wherein one or at least two-H of linear or branched alkyl groups containing 1 to 8 carbon atoms are each independently substituted with-F or-Cl;

said L is _A21 、L _A22 、L _A23 、L _A24 And L _A25 Each independently represents-H or-F;

said X is _A21 represents-F, -CF ₃ 、-OCF ₃ or-CH ₂ CH ₂ CH＝CF ₂ 。

Preferably, the liquid crystal composition further comprises at least one compound of formula III;

the R is _M1 And R _M2 Each independently represents-H, a linear or branched alkyl group having 1 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc.) carbon atoms,

Or

Or 1 or 2 or more-CH which is not adjacent to 1 or 2 of a linear or branched alkyl group having 1 to 12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc.) carbon atoms ₂ -groups independently replaced by-CH = CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively;

the ring

Ring(s)

And ring

Each independently represent

Or

Or alternatively

Of one or at least two-CH ₂ -substituted by-O-, or

A group in which one-H is replaced by halogen;

z is _M1 And Z _M2 Each independently represents a single bond-CO-O-) -O-CO-, -CH ₂ O-、-OCH ₂ -、-CH＝CH-、-C≡C-、-CH ₂ CH ₂ -or- (CH) ₂ ) ₄ -；

N is said _M1 Represents 0, 1, 2 or 3, and when n _M1 When represents 2 or 3, a ring

Same or different, Z _M2 The same or different.

Preferably, the compound of formula III is any one of or a combination of at least two of the compounds having the following structures:

the R is _M1 And R _M2 All have the same meaning as in formula III.

Preferably, the total weight of the compound of formula II-1 is 1-60% of the total weight of the liquid crystal composition, such as 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, etc., preferably 5-50%, and more preferably 10-40%.

Preferably, the total weight of the compound of formula II-2 is 1-70% of the total weight of the liquid crystal composition, such as 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, etc., preferably 5-60%, more preferably 10-50%.

Preferably, the total weight of the compound of formula III is 10-80% of the total weight of the liquid crystal composition, such as 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc., preferably 15-75%, and more preferably 20-70%.

The second purpose of the invention is to provide a liquid crystal display device, which comprises the liquid crystal composition.

Compared with the prior art, the invention has the following beneficial effects:

the liquid crystal composition provided by the invention has appropriate optical anisotropy and dielectric anisotropy, higher clearing point, lower rotational viscosity and higher K _ave On the premise of the value, the VHR-initial and low-temperature storage performance can be maintained at a stable level, the conductivity I/V value is remarkably lower, the ion dissipation speed is higher, the occurrence of the ghost shadow of the liquid crystal panel can be effectively improved, and the reliability is higher.

Drawings

FIG. 1 is an RDC chart of the liquid crystal compositions of examples 3, 6, 9 and comparative example 1.

FIG. 2 is an RDC chart of the liquid crystal compositions of examples 12, 15, 18 and comparative example 2.

FIG. 3 is an RDC chart of the liquid crystal compositions of examples 21, 24, 27 and comparative example 3.

FIG. 4 is an RDC chart of the liquid crystal compositions of examples 30, 33, 36 and comparative example 4.

Detailed Description

For the purpose of facilitating an understanding of the present invention, the following examples are set forth herein. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitation of the present invention.

For convenience of expression, in the following examples and comparative examples, the structures of the groups in the liquid crystal composition are represented by codes listed in table 1:

TABLE 1

In table 1, the dashed line represents the access site of the group, and the short straight line in the group without the dashed line represents the access site.

Illustratively, the structural code of the compound of the following structural formula is illustrated:

by using the codes in the table 1, the structure is ncmpm, wherein n represents alkyl with the carbon number n, namely the leftmost alkyl of the compound, m represents alkyl with the carbon number m, namely the rightmost alkyl of the compound, and CPP represents cycloalkyl, phenyl and phenyl which are connected in sequence from left to right.

The parameters of the performance tests referred to in the following examples and comparative examples are defined in detail in table 2.

TABLE 2

Parameter(s)	Parameter definition
		Δn	Optical anisotropy
C _P	Clearing Point (nematic phase-transition temperature of isotropic phase,. Degree.C.)
		K _ave	Average elastic constant
γ1	Rotational viscosity (mPa.s)
		Δε	Dielectric anisotropy
ε⊥	Dielectric constant in the direction perpendicular to the molecular axis
		t _-30℃	Low temperature storage time (h, at-30 deg.C)
I/V	Conductance (Gohm) ^-1 )
		VHR-initio	Initial Voltage holding ratio (%)

The following examples and comparative examples were conducted with the following performance test methods and parameters:

the delta n is obtained by testing under a sodium lamp (589 nm) light source at 25 ℃;

C _P testing by using a melting point instrument quantitative method;

Δε＝ε _‖ -ε _⊥ wherein epsilon _‖ Is parallel toDielectric constant on molecular axis,. Epsilon _⊥ For the dielectric constant perpendicular to the molecular axis, test conditions: the temperature is 25 ℃, the temperature is 1KHz, the test box is TN90 type, and the box thickness is 7 mu m;

gamma 1 is obtained by testing a TOYO 6254 type liquid crystal physical property evaluation system; the testing temperature is 25 ℃, the testing voltage is 90V, and the thickness of the testing box is 20 mu m;

Δε＝ε _‖ -ε _⊥ wherein epsilon _‖ Is the dielectric constant, ε, parallel to the molecular axis _⊥ For the dielectric constant perpendicular to the molecular axis, test conditions: the temperature is 25 ℃, the temperature is 1KHz, the test box is TN90 type, and the box thickness is 7 mu m;

t _-30℃ the test method (2): observing whether crystals are separated out every day in a low-temperature constant temperature box at the temperature of minus 30 ℃;

I/V, test method: filling a 9-micron twisted nematic liquid crystal cell (TN cell) box with liquid crystal, electrifying the TN cell at 10V/0.01HZ, and testing by using TOYO 6254 (liquid crystal physical property evaluation system) to obtain an I/V value;

VHR-initial was tested using a TOYO 6254 model liquid Crystal physical Property evaluation System; the test temperature is 60 ℃, the test voltage is 5V, and the test frequency is 6Hz;

the test method of the RDC graph comprises the following steps: a TOYO 6254 type liquid crystal physical property evaluation system was used to apply a DC voltage of 5V 3600s at 25. + -. 0.5 ℃ and then to disconnect the power supply, and the residual potential of the liquid crystal was continuously measured for 3600s and the potential change curve was recorded.

The liquid crystal compositions provided in the following examples and comparative examples each include a liquid crystal HOST, specifically, liquid crystal HOST-1 (HOST-1), liquid crystal HOST-2 (HOST-2), liquid crystal HOST-3 (HOST-3), and liquid crystal HOST-4 (HOST-4), and the formulations are shown in tables 3-1 to 3-4.

TABLE 3-1 HOST-1 formulation

Components	Content (%)
		2CCGF	1.5
3CCGF	8
		4CCGF	3
5CCGF	5
		3CCPOCF3	9
3CCV	33
		2IU1(2F)OUF	6.5
3IU1(2F)OUF	8
		3PGU1(2F)OUF	6
4PGU1(2F)OUF	6
		5PGU1(2F)OUF	6
2PGU1(2F)OPOCF3	5
		3PGU1(2F)OPOCF3	2.5

TABLE 3-2 HOST-2 formulation

Components	Content (%)
		5CCV	10.5
3CCPOCF3	7.5
		5PP1	6
VCCP1	7
		3CCV	20
V2CCP1	7.5
		3CCV1	12
3PGP2V(2F)	2.5
		3D2PUF	3
3CDPUF	3
		3CD2PUF	6
2PGU1(2F)OPOCF3	5
		3PGU1(2F)OPOCF3	5
4PGU1(2F)OPOCF3	5

TABLE 3-3 HOST-3 formulation

Components	Content (%)
		3CPP2	4
3CGPC3	2
		3CCPUF	4
2CCPUF	2
		4CCPUF	2
2PGUF	5
		3PGUF	5.5
VCCP1	5
		3CCV	37.5
3CCV1	5.5
		2PGPC3	1.5
3PGPC2	3
		3PGPF	3
3DPUF	5.5
		3PU1(2F)OUF	14.5

TABLE 3-4 HOST-4 formulation

Components	Content (%)
		3CPPC3	3
3CCUF	4.5
		3CCPUF	10
2CCPUF	8
		4CCPUF	7
3CCV	46.5
		3CCV1	3.5
3PU1(2F)OUF	11.5
		3PGU1(2F)OUF	3
4PGU1(2F)OUF	3

The characterization parameters of the above four liquid crystal hosts are shown in table 4.

TABLE 4

	△n	C _P	K _ave	γ ₁	△ε	ε _⊥
							HOST-1	0.108	78	10.5	80	12.6	3.7
HOST-2	0.109	100	14.9	88	5.6	2.8
							HOST-3	0.115	81	11.1	69	8.7	3.2
HOST-4	0.1	98	12.3	79	8.2	3

The examples of the present invention and the comparative examples each provide liquid crystal compositions, wherein the liquid crystal compositions of the examples are each composed of the above-mentioned HOST-1 to HOST-4 and various contents of the compounds of the general formula I (GUEST-1 to GUEST-3), and the liquid crystal compositions of the comparative examples each comprise only the above-mentioned HOST-1 to HOST-4, and the data on the liquid crystal HOST types, the types and contents of the compounds of the general formula I (based on the total weight of the liquid crystal compositions), and the performance tests of the liquid crystal compositions are presented in the form of the following tables.

Examples 1 to 9 and comparative example 1

Comparative example 1 and examples 1 to 9 according to the present invention were constructed by adding different amounts of the compounds of formula I (GUEST-1, GUEST-2 and GUEST-3) as shown in Table 5 below to HOST-1, and the results of the performance test were shown in Table 5.

GUEST-1：

(ascribed to the general formula I-1);

GUEST-2：

(belonging to the general formula I-2);

GUEST-3：

(ascribed to the general formula I-5);

TABLE 5 formulations and characterization parameters for comparative example 1, examples 1-9

As can be seen from the data in Table 5, the liquid crystal composition of the present invention has significantly lower conductance I/V value and higher reliability on the premise of maintaining the VHR-initial and low temperature storage performance at a stable level.

FIG. 1 is an RDC chart of the liquid crystal compositions of examples 3, 6, and 9 and comparative example 1, which shows that the liquid crystal compositions containing the compound of formula I of the present invention have a faster ion dissipation rate, and are effective in improving the occurrence of the image sticking of the liquid crystal panel.

Examples 10 to 18 and comparative example 2

Comparative example 2 and examples 10 to 18 according to the present invention were constructed by adding different amounts of the compounds of the general formula I (GUEST-1, GUEST-2 and GUEST-3) as shown in Table 6 below to HOST-2, and the results of the performance test were shown in Table 6.

TABLE 6 formulations and characterization parameters for comparative example 2 and examples 10-18

As can be seen from the data in Table 6, the liquid crystal composition of the present invention has significantly lower conductance I/V values and higher reliability while maintaining the VHR-initial and low temperature storage performance at a stable level.

FIG. 2 is an RDC chart of the liquid crystal compositions of examples 12, 15, 18 and comparative example 2, which shows that the liquid crystal composition containing the compound of formula I of the present invention has a faster ion dissipation rate, and is effective in improving the occurrence of the afterimage of the liquid crystal panel.

Examples 19 to 27 and comparative example 3

Comparative example 3 and examples 19 to 27 according to the present invention were constructed by adding different amounts of the compounds of the general formula I (GUEST-1, GUEST-2 and GUEST-3) as shown in Table 7 below to HOST-3, and the results of the performance tests are shown in Table 7.

TABLE 7 formulations and characterization parameters for comparative example 3 and examples 19-27

As can be seen from the data in Table 7, the liquid crystal composition of the present invention has significantly lower conductance I/V value and higher reliability while maintaining the VHR-initial and low temperature storage performance at a stable level.

FIG. 3 is an RDC chart of the liquid crystal compositions of examples 21, 24, 27 and comparative example 3, showing that the liquid crystal composition containing the compound of formula I of the present invention has a faster ion dissipation rate, which is effective in improving the occurrence of the afterimage of the liquid crystal panel.

Examples 28 to 36 and comparative example 4

Comparative example 4 and examples 28 to 36 according to the present invention were constructed by adding different amounts of the compounds of formula I (GUEST-1, GUEST-2 and GUEST-3) as shown in Table 8 below to HOST-4, and the results of the performance test were shown in Table 8.

TABLE 8 formulation and characterization parameters for comparative example 4 and examples 28-36

As can be seen from the data in Table 8, the liquid crystal composition of the present invention has significantly lower conductance I/V value and higher reliability while maintaining the VHR-initial and low temperature storage performance at a stable level.

FIG. 4 is an RDC chart of the liquid crystal compositions of examples 30, 33, 36 and comparative example 4, which shows that the liquid crystal compositions containing the compound of formula I of the present invention have a faster ion dissipation rate, and are effective in improving the occurrence of the image sticking of the liquid crystal panel.

The applicant states that the present invention is illustrated by the above examples to show the details of the process equipment and process flow of the present invention, but the present invention is not limited to the above details of the process equipment and process flow, which means that the present invention must not be implemented by relying on the above details of the process equipment and process flow. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. A liquid crystal composition, characterized in that it comprises at least one compound of formula I, and at least one compound of formula II-1 and/or at least one compound of formula II-2;

the compound of the general formula I is any one or the combination of at least two of the compounds with the following structures:

t is an integer of 1-11;

the R is _N Represents at least one-CH of-H, -OH, alkyl containing 1-15 carbon atoms, or alkyl containing 1-15 carbon atoms ₂ -substituted by-O-, -CO-or-NH-;

said Y ₁ -Y ₄ Each independently represents H or an alkyl group having 1 to 4 carbon atoms;

said R is _A1 And R _A2 Each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms,

Or 1 or non-adjacent 2 or more-CH in a linear or branched alkyl group having 1 to 12 carbon atoms ₂ -each independently is substituted with-CH = CH-, -C ≡ C-, -O-) -CO-, -CO-O-or-O-CO-substituted radicals, or a linear or branched alkyl group having 1 to 12 carbon atoms,

Or at least two of-H are each independently substituted with-F or-Cl;

said X _A1 And X _A2 Each independently represents any one of halogen, haloalkyl containing 1 to 5 carbon atoms, haloalkoxy containing 1 to 5 carbon atoms, haloalkenyl containing 2 to 5 carbon atoms or haloalkenyloxy containing 2 to 5 carbon atoms;

the ring

Ring (C)

Ring (C)

And ring

Each independently represent

Or

Of one or at least two-CH ₂ -substituted by-O-, or

Or at least two of-H are substituted by-CN, -F or-Cl, or

Or at least two of-CH = groups substituted by-N =;

n is _A11 And n _A2 Each independently represents 0, 1, 2 or 3, and when n _A11 When =2 or 3, a ring

Same or different, Z _A21 The same or different;

n is _A12 Represents 1 or 2, and when n _A12 When =2, ring

The same or different;

said L is _A11 、L _A12 、L _A13 、L _A21 And L _A22 Each independently represents-H, -F or-CH ₃ Any one of the above;

the liquid crystal composition further comprises at least one compound of formula III;

the R is _M1 And R _M2 Each independently represents-H, a linear or branched alkyl group having 1 to 12 carbon atoms,

Or 1 or non-adjacent 2 or more-CH in a linear or branched alkyl group having 1 to 12 carbon atoms ₂ -groups independently replaced by-CH = CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, respectively;

the ring

Ring (C)

And a ring

Each independently represent

Or alternatively

Of one or at least two-CH ₂ -substituted by-O-, or

A group wherein one of-H is replaced by halogen;

N is _M1 Represents 0, 1, 2 or 3, and when n _M1 When represents 2 or 3, a ring

Same or different, Z _M2 The same or different;

in the liquid crystal composition, the content of the compound shown in the general formula I is 50-5000ppm, the total weight of the compound shown in the general formula II-1 accounts for 1-60% of the total weight of the liquid crystal composition, the total weight of the compound shown in the general formula II-2 accounts for 1-70% of the total weight of the liquid crystal composition, and the total weight of the compound shown in the general formula III accounts for 10-80% of the total weight of the liquid crystal composition.

2. The liquid crystal composition according to claim 1, wherein R is _N represents-H or an alkyl group containing 1 to 8 carbon atoms;

said Y is ₁ 、Y ₂ 、Y ₃ 、Y ₄ Are all methyl.

3. The liquid crystal composition of claim 1, wherein the compound of formula I is present in an amount of 100 to 4000ppm.

4. The liquid crystal composition of claim 3, wherein the compound of formula I is present in an amount of 100 to 3000ppm.

5. The liquid crystal composition of claim 4, wherein the compound of formula I is present in an amount of 200 to 1000ppm.

6. The liquid crystal composition of claim 1, wherein the compound of formula II-1 is any one or a combination of at least two of the compounds having the following structures:

Or 1 or non-adjacent 2 or more-CH in a linear or branched alkyl group having 1 to 8 carbon atoms ₂ -each independently is substituted with-CH = CH-, -C ≡ C-, -O-) -CO-, -CO-O-or-O-CO-substituted, or said linear or branched alkyl having 1 to 8 carbon atoms,

Or at least two of-H are each independently substituted with-F or-Cl;

the R is _v And R _w Each independently represents-CH ₂ -or-O-;

each of v and w independently represents 0 or 1;

said L _A13 And L _A13 ' independently of each other represents-H or-CH ₃ ；

Said X _A1 denotes-F, -CF ₃ or-OCF ₃ 。

7. The liquid crystal composition of claim 1, wherein the compound of formula II-2 is any one or a combination of at least two of the compounds having the following structures:

said R is _A2 Represents a straight chain or branched alkyl group having 1 to 8 carbon atoms or a straight chain or branched alkyl group having 1 to 8 carbon atoms, wherein the alkyl group is not adjacent to 1 or 2 or more-CH ₂ -radicals each independently substituted by-CH = CH-, -C ≡ C-, -O-, -CO-O-, or-O-CO-, or radicals each independently substituted by-F or-Cl for one or at least two-H of linear or branched alkyl groups containing 1 to 8 carbon atoms;

said X _A21 denotes-F, -CF ₃ 、-OCF ₃ or-CH ₂ CH ₂ CH＝CF ₂ 。

8. The liquid crystal composition of claim 1, wherein the compound of formula III is any one of or a combination of at least two of the compounds having the following structures:

the R is _M1 And R _M2 All having the same limitations as defined in claim 1.

9. The liquid crystal composition of claim 1, wherein the total weight of the compound of formula II-1 is 5-50% of the total weight of the liquid crystal composition.

10. The liquid crystal composition of claim 9, wherein the total weight of the compound of formula II-1 is 10-40% of the total weight of the liquid crystal composition.

11. The liquid crystal composition of claim 1, wherein the total weight of the compound of formula II-2 is 5-60% of the total weight of the liquid crystal composition.

12. The liquid crystal composition of claim 11, wherein the total weight of the compound of formula II-2 is 10-50% of the total weight of the liquid crystal composition.

13. The liquid crystal composition of claim 1, wherein the total weight of the compound of formula III is 15-75% of the total weight of the liquid crystal composition.

14. The liquid crystal composition of claim 13, wherein the total weight of the compound of formula III is 20-70% of the total weight of the liquid crystal composition.

15. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 14.