CN114540043A - Negative liquid crystal composition containing terphenyl and application thereof - Google Patents
Negative liquid crystal composition containing terphenyl and application thereof Download PDFInfo
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- CN114540043A CN114540043A CN202210167748.5A CN202210167748A CN114540043A CN 114540043 A CN114540043 A CN 114540043A CN 202210167748 A CN202210167748 A CN 202210167748A CN 114540043 A CN114540043 A CN 114540043A
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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
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
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- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
- C09K19/126—Compounds containing at least one asymmetric carbon atom
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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
- 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
- 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
- C09K19/3098—Unsaturated non-aromatic rings, e.g. cyclohexene rings
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- 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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- C09K19/06—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
- C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
- C09K2019/3004—Cy-Cy
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- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—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)
- C09K2019/3009—Cy-Ph
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- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—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)
- C09K2019/301—Cy-Cy-Ph
Abstract
The invention discloses a negative liquid crystal composition containing terphenyl and application thereof. The negative liquid crystal composition comprises at least one of compounds shown in a formula I, at least one of compounds shown in a formula II, at least one of compounds shown in a formula III and at least one of compounds shown in a formula IV, and further comprises one or more of compounds shown in a formula V. According to the liquid crystal composition, the dielectric anisotropy is improved and the rotational viscosity is reduced through the compound shown in the formula I; the rotational viscosity is reduced and the intersolubility is improved by the compound of the formula II; the function of improving the high-temperature reliability by the compound of the formula III; the refractive index is improved by the compound of formula IV; the high temperature reliability is improved by the compounds of formula V. The liquid crystal composition has low rotary viscosity and large elastic constant, further has low ratio of the rotary viscosity to the elastic constant, can obviously improve the response speed and contrast of a liquid crystal display when being used in the liquid crystal display, and can be used for preparing liquid crystal display materials or liquid crystal display devices.
Description
Technical Field
The invention relates to a negative liquid crystal composition containing terphenyl and application thereof, belonging to the technical field of liquid crystal display.
Background
In recent years, LCD displays have been widely used in various products as the most mainstream displays, and among them, negative LCD displays are widely used in mobile phones, notebook computers, tablet computers, computer monitors, televisions, etc. because of their unique high transmittance characteristics.
At present, the negative liquid crystal display has the main disadvantage of slow response speed, and how to improve the response speed becomes an important subject of the negative liquid crystal display.
Disclosure of Invention
The object of the present invention is to provide a negative liquid crystal composition containing terphenyl, which has a low rotational viscosity, thereby achieving the object of improving the response speed of a liquid crystal display.
Generally, reducing the clearing point of the composition may achieve the purpose of reducing rotational viscosity, but as the clearing point is reduced, the upper limit of the display use temperature may be reduced. The liquid crystal composition provided by the invention has high clearing point, low rotational viscosity, large elastic constant and large optical anisotropy, and solves the technical problems.
The negative liquid crystal composition provided by the invention comprises at least one of compounds shown in a formula I, at least one of compounds shown in a formula II, at least one of compounds shown in a formula III and at least one of compounds shown in a formula IV;
in the formula I, R1、R2Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the1To represent
In the formula II, R3、R4Each independently represents C1～C12Straight chain alkyl of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the2To represent
In the formula III, R5、R6Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the3、A4Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
in the formula IV, R7、R8Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); l is1、L2、L3Each independently represents H or F.
Preferably, the compound shown in the formula I is selected from one or more of the formula IA to the formula IB;
in the formula, R1、R2Each independently represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C2～C7A linear alkenyl group of (a);
preferably, the compound represented by formula I is selected from one or more of formula IA1 to formula IB 52:
more preferably, the compound shown in the formula I is selected from one or more of the compounds shown in the formulas IA 13-IA 16, IB 9-IB 12 and IB 17-IB 20;
most preferably, the compound of formula I is selected from one or more of formulae IA14, IA16, IB10, IB 18.
Preferably, the compound shown in the formula II is selected from one or more of a formula IIA to a formula IIC;
in the formula, R3、R4Each independently represents C1～C7Straight chain alkyl of (1), C1～C7Linear alkoxy of (5) or C2～C7Linear alkenyl groups of (a).
Preferably, the compound of formula II is selected from one or more of formula IIA1 to formula IIC 48:
more preferably, the compound shown in the formula II is selected from one or more of the compounds shown in the formula IIA 13-IIA 16, IIA 27-IIA 30 and IIB 13-IIB 24;
most preferably, the compound shown in the formula II is selected from one or more of the compounds shown in the formula IIA13, IIA14, IIA27, IIA28, IIB13, IIB14, IIB18 and IIB 21.
Preferably, the compound shown in the formula III is selected from one or more of the formula IIIA to the formula IIIB;
in the formula, R5、R6Each independently represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C1～C7Linear alkenyl groups of (a).
More preferably, the compound of formula III is selected from one or more of formulae IIIA1 to IIIB 24:
more preferably, the compound shown in the formula III is selected from one or more of the compounds shown in the formulas IIIA 5-IIIA 8, IIIA 9-IIIA 12 and IIIA 16-IIIA 19;
most preferably, the compound of formula III is selected from one or more of formulae IIIA5, IIIA9, IIIA17, IIIB2, IIIB4, IIIB 20.
Preferably, the compound shown in the formula IV is selected from one or more of the formula IVA to the formula IVB;
in the formula, R7Is represented by C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r8Represents C1～C7Straight chain alkyl or C1～C7Linear alkoxy groups of (1).
The compound shown in the formula IV is selected from one or more of the formula IVA 1-formula IVB 36:
more preferably, the compound shown in the formula IV is selected from one or more of the formulas IVB 27-IVB 31;
most preferably, the compound of formula IV is selected from one or more of formulae IVB27, IVB 28.
The negative liquid crystal composition also comprises one or more compounds shown in a formula V, wherein the compounds are tetrabiphenyl compounds, and the compounds have the function of improving the high-temperature reliability;
in the formula, R9、R10Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12Linear alkenyl groups of (a).
Preferably, the compound shown in the formula V is selected from one or more of formula V-1-formula V-9:
more preferably, the compound shown in the formula V is selected from one or more of the formulas V-1 to V-4;
most preferably, the compound of formula V is selected from one or more of formulas V-3 and V-4.
Preferably, the negative liquid crystal composition consists of a compound shown as a formula I, a compound shown as a formula II, a compound shown as a formula III, a compound shown as a formula IV and a compound shown as a formula V;
the negative liquid crystal composition comprises the following components in percentage by mass:
1-20% of a compound shown in formula I; 20-60% of a compound shown in a formula II; 35-60% of a compound shown as a formula III; 1-10% of a compound shown as a formula IV; 0-1% of a compound represented by formula V.
Preferably, the negative liquid crystal composition comprises the following components in percentage by mass:
6-18% of a compound shown as a formula IA; 10-25% of a compound shown in formula IIA; 15-25% of a compound represented by formula IIB; 45-55% of a compound shown as a formula IIIA; 1-9% of a compound shown as a formula IVA; 0-1% of a compound represented by formula V.
Preferably, the liquid crystal composition comprises the following components in percentage by mass:
1) 5-15% of a compound shown as a formula I, wherein the compound contains 6-14% of one or more compounds shown as formulas IB 9-IB 12 and/or IB 17-IB 20;
2) 25-55% of a compound shown as a formula II, wherein the compound contains 10-20% of one or more compounds shown as formulas IIA 13-IIA 16 and/or IIA 27-IIA 30, and contains 15-25% of one or more compounds shown as formulas IIB 13-IIB 24;
3) 45-55% of a compound shown in a formula III, wherein the compound contains 46-53% of one or more compounds shown in formulas IIIA 5-IIIA 8 and/or IIIA 9-IIIA 12;
4) 1-9% of a compound shown as a formula IV, wherein 1-7% of one or more compounds shown as formulas IVA 27-IVA 31;
5) 0-1% of a compound represented by formula V.
More preferably, the liquid crystal composition comprises the following components in percentage by mass:
1) 9-15% of a compound shown as a formula I, wherein the compound contains one or more compounds represented by a general formula IB10 and/or IB 18;
2) 30-52% of a compound shown as a formula II, wherein the compound contains 11-20% of one or more compounds shown as a formula IIA27 and/or IIA28, and contains 15-25% of one or more compounds shown as a formula IIB13 and/or IIB14 and/or IIB18 and/or IIB 21;
3) 46-53% of a compound shown in a formula III, wherein the compound contains one or more compounds shown in a formula IIIA5 and/or IIIA 9;
4) 1-7% of a compound shown in a formula IV, wherein the compound contains one or more compounds shown in a formula IVB27 and/or IVB 28;
5) 0-1% of a compound represented by formula V.
More preferably, the composition of the liquid crystal composition is as shown in tables 1-4:
TABLE 1 one of the compositions of the liquid crystal compositions of the present invention
| Serial number | Components | Code | Weight percent (%) |
| 1 | IB10 | 1PWO2 | 8％～12％ |
| 2 | IIA27 | VCCWO1 | 4％～8％ |
| 3 | IIA28 | VCCWO2 | 7％～9％ |
| 4 | IIA27 | 2CLWO2 | 5％～6％ |
| 5 | IIA28 | 2CLWO4 | 4％～5％ |
| 6 | IIB13 | 3CLWO2 | 5％～6％ |
| 7 | IIB21 | 3CLWO3 | 5％～6％ |
| 8 | IIIA5 | 3CCV | 40％～45％ |
| 9 | IIIA9 | 3CCV1 | 4％～11％ |
| 10 | IVB28 | 2PGIWO4 | 1％～6％ |
TABLE 2 composition II of the liquid crystal composition of the invention
TABLE 3 composition III of liquid crystal compositions of the invention
| Serial number | Components | Code | Weight percent (%) |
| 1 | IB10 | 1PWO2 | 8％～12％ |
| 2 | IIA27 | VCCWO1 | 4％～8％ |
| 3 | IIA28 | VCCWO2 | 7％～9％ |
| 4 | IIA27 | 2CLWO2 | 5％～6％ |
| 5 | IIA28 | 2CLWO4 | 4％～5％ |
| 6 | IIB13 | 3CLWO2 | 5％～6％ |
| 7 | IIB21 | 3CLWO3 | 5％～6％ |
| 8 | IIIA5 | 3CCV | 40％～45％ |
| 9 | IIIA9 | 3CCV1 | 4％～11％ |
| 10 | IVB28 | 2PGIWO4 | 1％～6％ |
| 11 | V-4 | 3PGPW1 | 0％～1％ |
TABLE 4 composition IV of the liquid crystal composition of the present invention
| Serial number | Components | Code | Weight percent (%) |
| 1 | IB18 | 3PWO2 | 8％～12％ |
| 2 | IIA27 | VCCWO1 | 4％～8％ |
| 3 | IIA28 | VCCWO2 | 7％～9％ |
| 4 | IIA27 | 2CLWO2 | 5％～6％ |
| 5 | IIA28 | 2CLWO4 | 4％～5％ |
| 6 | IIB13 | 3CLWO2 | 5％～6％ |
| 7 | IIB21 | 3CLWO3 | 5％～6％ |
| 8 | IIIA5 | 3CCV | 40％～45％ |
| 9 | IIIA9 | 3CCV1 | 4％～11％ |
| 10 | IVB28 | 2PGIWO4 | 1％～6％ |
| 11 | V-4 | 3PGPW1 | 0％～1％ |
The following components can also be added to the liquid crystal composition of the invention: antioxidants, ultraviolet absorbers, light stabilizers, infrared absorbers, and the like.
According to the liquid crystal composition provided by the invention, the dielectric anisotropy is improved and the rotational viscosity is reduced through the compound shown in the formula I; the rotational viscosity is reduced and the intersolubility is improved by the compound shown in the formula II; the high temperature reliability is improved by the compound shown in the formula III; the refractive index is improved by the compound shown in the formula IV; the high temperature reliability is improved by the compound of formula V.
The method for producing the liquid crystal composition of the present invention is not particularly limited, and it can be produced by mixing two or more compounds by a conventional method such as a method of mixing the different components at a high temperature and dissolving each other, wherein the liquid crystal composition is dissolved in a solvent for the compounds and mixed, and then the solvent is distilled off under reduced pressure; alternatively, the liquid crystal composition of the present invention can be prepared by a conventional method, for example, by dissolving the component having a smaller content in the main component having a larger content at a higher temperature, or by dissolving each of the components in an organic solvent, for example, acetone, chloroform or methanol, and then mixing the solutions to remove the solvent.
The liquid crystal composition has low rotary viscosity, large elastic constant and low ratio of the rotary viscosity to the elastic constant, and the use of the liquid crystal composition in a liquid crystal display can obviously improve the response speed and the contrast of the liquid crystal display.
The negative liquid crystal composition can be used for preparing liquid crystal display materials or liquid crystal display devices.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Unless otherwise indicated, percentages in the present invention are weight percentages; the temperature units are centigrade; Δ n represents optical anisotropy (25 ℃); epsilon∥And ε⊥Respectively represent the parallel and perpendicular dielectric constants (25 ℃, 1000 Hz); Δ ε represents the dielectric anisotropy (25 ℃, 1000 Hz); γ 1 represents rotational viscosity (mpa.s, 25 ℃); cp represents the clearing point (. degree. C.) of the liquid crystal composition; k11、K22、K33Respectively representing the splay, twist and bend elastic constants (pN, 25 ℃).
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 5.
TABLE 5 radical structural code of liquid-crystalline compounds
Take the following compound structure as an example:
expressed as: 3CPW02
In the following examples, the liquid crystal composition was prepared by a thermal dissolution method, comprising the steps of: weighing the liquid crystal compound by a balance according to the weight percentage, wherein the weighing and adding sequence has no specific requirements, generally weighing and mixing the liquid crystal compound in sequence from high melting point to low melting point, heating and stirring at 60-100 ℃ to uniformly melt all the components, filtering, performing rotary evaporation, and finally packaging to obtain the target sample.
In the following examples, the weight percentages of the components in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following tables.
Examples 1,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 6, and cyclohexyl in all structural formulas is in a trans-form configuration:
TABLE 6 weight percents of the components and the performance parameters of the liquid crystal compositions
Examples 2,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 7, and cyclohexyl in all structural formulas is in a trans-form configuration:
TABLE 7 weight percents of the components and the performance parameters of the liquid crystal compositions
Examples 3,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 8, and cyclohexyl in all structural formulas is in a trans-form configuration:
TABLE 8 weight percents of the components and Performance parameters of the liquid Crystal compositions
Examples 4,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 9, and cyclohexyl in all structural formulas below is in a trans-configuration:
TABLE 9 weight percents of the components and Performance parameters of the liquid Crystal compositions
Examples 5,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 10, and cyclohexyl in all structural formulas is in a trans-form configuration:
TABLE 10 weight percents of the components and the performance parameters of the liquid crystal compositions
Examples 6,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 11, and cyclohexyl in all structural formulas is in a trans-form configuration:
TABLE 11 weight percents of the components and Performance parameters of the liquid Crystal compositions
Example 7,
The liquid crystal composition is prepared from the following liquid crystal compounds in percentage by weight, the specific proportion is shown in table 12, and cyclohexyl in all structural formulas is in a trans-form configuration:
TABLE 12 weight percents of the components and Performance parameters of the liquid Crystal compositions
Comparative examples 1,
TABLE 13 weight percents of the components and Performance parameters of the liquid Crystal compositions
The liquid crystal compositions obtained in example 7 and comparative example 1 were compared together for each of their performance parameter values, see Table 14.
TABLE 14 comparison of Performance parameters of liquid Crystal compositions
| Item | △n | △ε | Cp | γ1 | K11 | K22 | K33 |
| Example 7 | 0.0912 | -2.8 | 84 | 68 | 14.3 | 7.2 | 15.4 |
| Comparative example 1 | 0.1040 | -3.9 | 81 | 108 | 15.2 | 7.6 | 16.2 |
Example 7 has a lower rotational viscosity and thus a faster response time than comparative example 1.
From the above embodiments, the liquid crystal composition provided by the present invention has low rotational viscosity, high resistivity, suitable optical anisotropy, good low-temperature intersolubility, and excellent light stability and thermal stability, and can reduce the response time of the liquid crystal display, thereby solving the problem of slow response speed of the liquid crystal display. Therefore, the liquid crystal composition provided by the invention is suitable for VA, IPS and FFS type TFT liquid crystal display devices with fast response, and is particularly suitable for IPS and FFS liquid crystal display devices.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A negative liquid crystal composition comprises at least one of compounds shown as a formula I, at least one of compounds shown as a formula II, at least one of compounds shown as a formula III and at least one of compounds shown as a formula IV;
in the formula I, R1、R2Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the1To represent
In the formula II, R3、R4Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12The linear alkenyl group of (1); a. the2Represent
In the formula III, R5、R6Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12A linear alkenyl group of (a); a. the3、A4Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene;
in the formula IV, R7、R8Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy radical of (1) or C2～C12A linear alkenyl group of (a); l is1、L2、L3Each independently represents H or F.
2. The negative liquid crystal composition according to claim 1, wherein: the compound shown in the formula I is selected from one or more of the formula IA to the formula IB;
in the formula, R1、R2Each independently represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C2～C7Linear alkenyl groups of (a).
3. The negative liquid crystal composition according to claim 1 or 2, wherein: the compound shown in the formula II is selected from one or more of formula IIA to formula IIC;
in the formula, R3、R4Each independently represents C1～C7Straight chain alkyl of (1), C1～C7Linear alkoxy of (5) or C2～C7Linear alkenyl groups of (a).
4. The negative liquid crystal composition according to any one of claims 1 to 3, wherein: the compound shown in the formula III is selected from one or more of the formulas IIIA to IIIB;
in the formula, R5、R6Each independently represents C1～C7Straight chain alkyl group of (1), C1～C7Linear alkoxy of (5) or C1～C7Linear alkenyl groups of (a).
5. The negative liquid crystal composition according to any one of claims 1 to 4, wherein: the compound shown in the formula IV is selected from one or more of the formula IVA to the formula IVB;
in the formula, R7Is represented by C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r8Represents C1～C7Straight chain alkyl of (1) or C1～C7Linear alkoxy groups of (1).
6. The negative liquid crystal composition according to any one of claims 1 to 5, wherein: the negative liquid crystal composition further comprises one or more compounds shown as a formula V:
in the formula, R9、R10Each independently represents C1～C12Straight chain alkyl group of (1), C1～C12Linear alkoxy of (5) or C2～C12Linear alkenyl groups of (a).
7. The negative liquid crystal composition according to claim 6, wherein: the compound shown in the formula V is selected from one or more of formula V-1-formula V-9:
8. the negative liquid crystal composition according to any one of claims 1 to 7, wherein: the negative liquid crystal composition is composed of a compound shown as a formula I, a compound shown as a formula II, a compound shown as a formula III, a compound shown as a formula IV and a compound shown as a formula V;
the negative liquid crystal composition comprises the following components in percentage by mass:
1-20% of a compound shown in formula I; 20-60% of a compound shown in a formula II; 35-60% of a compound shown as a formula III; 1-10% of a compound shown as a formula IV; 0-1% of a compound represented by formula V.
9. The negative liquid crystal composition according to claim 8, wherein: the negative liquid crystal composition comprises the following components in percentage by mass:
6-18% of a compound shown as a formula IA; 10-25% of a compound shown in formula IIA; 15-25% of a compound represented by formula IIB; 45-55% of a compound shown as a formula IIIA; 1-9% of a compound shown as a formula IVA; 0-1% of a compound represented by formula V.
10. Use of the negative liquid crystal composition of any one of claims 1 to 9 for the preparation of a liquid crystal display material or a liquid crystal display device.
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