TW202126793A - Liquid crystal composition containing 2-methyl-3,4,5-trifluorobenzene structure and application thereof - Google Patents

Abstract

The present invention relates to the technical field of liquid crystal compositions, and specifically relates to a liquid crystal composition containing a 2-methyl-3,4,5-trifluorobenzene structure. The composition of the present invention comprises one or more compounds represented by general formula I: (I) a compound represented by general formula II: (II) and a compound represented by general formula III: (III). The present invention increases an elastic constant of the liquid crystal composition by adding the compound represented by general formula I, increases the dielectric anisotropy of the liquid crystal composition by increasing a general formula II-type compound, and reduces rotational viscosity by increasing the compound represented by general formula III. In addition, it is discovered in the present invention that the compound represented by general formula I has a relatively low rotational viscosity while having a very large elastic constant, and may keep the rotational viscosity unchanged while improving the elastic constant of the liquid crystal composition, thereby satisfying the requirements for a liquid crystal display of high contrast and rapid response.

Description

Liquid crystal composition containing 2-methyl-3,4,5-trifluorobenzene structure and application thereof

The invention belongs to the field of liquid crystal compositions, and specifically relates to a liquid crystal composition containing a 2-methyl-3,4,5-trifluorobenzene structure.

At present, as the most mainstream display, LCD displays have been widely used in various products. Among them, IPS and FFS mode displays are widely used in mobile phones, notebook computers, and tablets because of their unique hard screen characteristics and very wide viewing angle characteristics. Computers, computer monitors, televisions, etc.

The planar arrangement of IPS and FFS liquid crystals causes light leakage in the dark state, and the contrast performance is obviously inferior to VA (MVA, PVA, UV2A, PSVA) displays. It has been discovered through research that when the liquid crystal molecules are initially aligned, the alignment debris on the surface of the alignment layer will cause the alignment of the liquid crystal molecules to be disordered, leading to light leakage in the dark state; how to improve the disorder of the liquid crystal alignment has become an important issue for how to improve the IPS and FFS mode displays. Through research, it is found that an increase in the elastic constant of liquid crystal helps to improve the arrangement of liquid crystal molecules. Increasing the clearing point of the liquid crystal composition can achieve the purpose of improving the elastic constant. However, as the clearing point increases, the rotational viscosity of the liquid crystal composition increases, resulting in a slower response time of the liquid crystal display.

The present invention aims to provide a liquid crystal composition with a large elastic constant, so as to achieve the purpose of improving the contrast of the liquid crystal display. The present invention finds that the liquid crystal composition provided by the present invention has a large elastic constant on the one hand, and a lower rotational viscosity on the other hand, thereby realizing a liquid crystal display with high contrast and fast response.

The liquid crystal composition of the present invention includes one or more compounds represented by the general formula I:

Wherein, R ₁ and R ₂ each independently represent a C ₁ to C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ to C ₁₂ linear alkenyl group.

The liquid crystal composition includes one or more compounds represented by general formula II:

Wherein, R ₃ each independently represents a C ₁ to C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ to C ₁₂ linear alkenyl group; n ₁ =0 or 1; A ₁ each independently represents:

A ₂ each independently represents:

A ₃ each independently represents:

The liquid crystal composition includes one or more compounds represented by the general formula III:

Wherein, R ₄ and R ₅ each independently represent a C ₁ ~C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ ~C ₁₂ linear alkenyl group, and A ₄ , A ₅ each independently represent a trans 1,4-cyclohexyl or 1,4-phenylene.

The compound of general formula I provided by the present invention is a compound containing a cyclohexene structure, and this type of compound has a large elastic constant and is very effective for improving the elastic constant of the liquid crystal composition. The compound of general formula II provided by the present invention contains a compound in which a 2-methyl-3,4,5-trifluorobenzene structure is connected to a CF2O bridge bond. This type of compound has a very large dielectric anisotropy and a very large Dielectric anisotropy It can effectively improve the dielectric anisotropy of the liquid crystal composition when used in the liquid crystal composition. The compound of the general formula III provided by the present invention is a two-ring structure compound. The rotational viscosity of the liquid crystal composition is very effective. The combination of the above-mentioned substances can effectively improve the contrast and response speed of the liquid crystal display.

As a preferred solution, the compound represented by general formula I is selected from one or more of IA to IB:

Wherein, R ₁ and R ₂ each independently represent a C ₁ to C ₇ linear alkyl group or a C ₂ to C ₇ linear alkenyl group.

Preferably, the compound represented by the general formula I is selected from one or more of the formulas IA1 to IB45:

More preferably, the compound of formula I is selected from one or more of IA3, IA12, IA21, IA23, IA24, IA25, IA39, IA43, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31.

Particularly preferably, the compound of Formula I is selected from one or more of IA3, IA21, IA23, IA24, IA25, IA39, IA43, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31.

Most preferably, the compound of formula I is selected from one or more of IA3, IA21, IA23, IA39, IB3, IB5, IB8, IB10, IB26, IB27, IB30, and IB31.

Preferably, the liquid crystal composition contains the compound of general formula I with a mass percentage of 1 to 35%.

It is further preferred that the mass percentage is 2~30%, 2~14%, 10~30%, 5~18%, 2~28%, 5~28%, 5~25% or 2~26% of the compound of general formula I .

More preferably, the mass percentage of the compound represented by general formula I is 2-24%, 7-20%, 7-16%, 6-24%, 6-16%, 10-24% or 2-14%.

As a preferred solution, the compound represented by the general formula II is selected from one or more of IIA to IIM:

Preferably, the compound represented by the general formula II is selected from one or more of the formula IIA1~IIM5:

More preferably, the compound of formula II is selected from formula IIA3, IIB2, IIB3, IIC2, IIC3, IID2, IID3, IIF3, IIG3, IIG4, IIH3, IIH4, IIH5, IIJ3, IIK2, IIK3, IIL3, IIM3, IIM4 One or more of.

Particularly preferably, the compound of general formula II is selected from one or more of formula IIB3, IIC2, IIC3, IID3, IIF3, IIG3, IIG4, IIH3, IIH4, IIH5, IIK3, IIL3, IIM3, IIM4.

Most preferably, the compound of formula II is selected from one or more of formula IIB3, IIC2, IIC3, IID3, IIG3, IIG4, IIH3, IIH4, IIH5, IIL3, IIM3, IIM4.

Preferably, the liquid crystal composition contains 5-50% of the compound represented by Formula II.

More preferably, the liquid crystal composition contains 8 to 37%, 8 to 40%, 8 to 35%, 15 to 40%, 8 to 21%, and 8 to 38% of the compound represented by general formula II.

Particularly preferably, the liquid crystal composition contains 11 to 34%, 11 to 30%, 12 to 27%, 11 to 30%, 11 to 34%, 11 to 21%, 15 to 34%, 11 to 33%, 12~34% of the compound represented by general formula II.

As a preferred solution, the compound represented by the general formula III is selected from one or more of the formulas IIIA to IIIC:

Wherein, R ₄ each independently represents a C ₁ ~C ₇ linear alkyl group; R ₅ each independently represents a C ₁ ~C ₇ linear alkyl group, a linear alkoxy group or a C ₂ ~C _{7 linear alkyl group} Alkenyl.

Further preferably, the compound represented by the general formula III is selected from one or more of the formulas IIIA1 to IIIC24:

More preferably, the compound represented by the general formula III is selected from one or more of IIIA3, IIIA7, IIIA11, IIIA12, IIIA25, IIIA29, IIIA31, IIIA37, IIIB18, IIIB22, IIIC2, IIIC4, IIIC15, and IIIC20.

Particularly preferably, the compound represented by the general formula III is selected from one or more of IIIA25, IIIA29, IIIA37, IIIB18, IIIB22, IIIC2, IIIC4, IIIC15, and IIIC20.

Preferably, the liquid crystal composition contains 10 to 75% of the compound represented by the general formula III.

More preferably, the liquid crystal composition contains 20 to 70%, 30 to 70%, 20 to 50%, 30 to 50%, 20 to 65% of the compound represented by the general formula III.

Particularly preferably, the liquid crystal composition contains 22~62%, 42~65%, 22~65%, 32~47%, 32~65%, 22~47% of the compound represented by general formula III.

As a preferred solution, the liquid crystal composition further includes one or more compounds represented by the general formula IV:

Wherein, R ₆ and R ₇ each independently represent a C ₁ ~C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ ~C ₁₂ linear alkenyl group; A ₆ each independently represents a trans 1,4 -Cyclohexyl or 1,4-phenylene.

Preferably, the compound represented by the general formula IV is selected from one or more of IVA to IVB:

Wherein, R ₆ and R ₇ each independently represent a C ₁ to C ₇ linear alkyl group, a linear alkoxy group, or a C ₂ to C ₇ linear alkenyl group.

Preferably, the compound represented by the general formula IV is selected from one or more of IVA1 to IVB62:

More preferably, the compound represented by Formula IV is selected from one or more of IVA3, IVA5, IVA8, IVA10, IVA26, IVA31, IVA33, IVA53, IVB3, IVB5, IVB8, IVB10, IVB13, IVB25, IVB30, IVB35.

Particularly preferably, the compound of formula IV provided by the present invention is selected from one or more of IVA3, IVA8, IVA10, IVA26, IVA31, IVA33, IVA53, IVB3, IVB8, IVB13, IVB25, IVB30, IVB35.

Preferably, the liquid crystal composition contains 0-35% of the compound represented by the general formula IV.

More preferably, the liquid crystal composition contains 0-25%, 0-21%, 0-20%, 1-25%, 0-22%, 0-18% of the compound represented by general formula IV.

Particularly preferably, the liquid crystal composition contains 3-21%, 6-21%, 3-18% of the compound represented by general formula IV.

As a preferred solution, the liquid crystal composition of the present invention further includes one or more compounds represented by the general formula V:

Wherein, R ₈ each independently represents a C ₁ to C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ to C ₁₂ linear alkenyl group; X ₁ each independently represents F, CF ₃ , OCF ₃ ; L ₁ and L ₂ each independently represent H or F; A ₇ each independently represents:

Preferably, the compound represented by the general formula V is selected from one or more of VA to VK:

More preferably, R ₈ each independently represents a C ₁ -C ₇ linear alkyl group or a C ₂ -C ₇ linear alkenyl group; X1 each independently represents F, CF ₃ or OCF ₃ .

More preferably, R ₈ each independently represents a C ₁ to C ₅ linear alkyl group or a C ₂ to C ₅ linear alkenyl group; X 1 each independently represents F, CF ₃ or OCF ₃ .

Preferably, the liquid crystal composition further includes one or more compounds represented by the general formula VI:

Wherein, R ₉ and R ₁₀ each independently represent F, a C ₁ to C ₁₂ linear alkyl group, or a C ₂ to C ₁₂ linear alkenyl group.

More preferably, the compound represented by the general formula VI is selected from one or more of VIA or VIB:

Wherein, R ₉ and R ₁₀ each independently represent a C ₁ to C ₇ linear alkyl group or a C ₄ to C ₅ linear alkenyl group.

Further preferably, R ₉ and R ₁₀ each independently represent a C ₁ to C ₅ linear alkyl group or a C ₄ to C ₅ linear alkenyl group.

The liquid crystal composition of the present invention includes the following components by mass percentage:

(1) 1~35% of the compound represented by general formula I;

(2), 5-50% of the compound represented by general formula II;

(3) 10~75% of the compound represented by general formula III;

(4) 0~35% of the compound represented by general formula IV;

(5) 0-50% of the compound represented by general formula V to VIII.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-30% of the compound represented by general formula I;

(2) 8-40% of the compound represented by general formula II;

(3) 20~70% of the compound represented by general formula III;

(4) 0-25% of the compound represented by general formula IV;

(5) 0~43% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-24% of the compound represented by general formula I;

(2) 11~34% of the compound represented by general formula II;

(3) 22~65% of the compound represented by general formula III;

(4) 0-21% of the compound represented by general formula IV;

(5) 0~37% of the compound represented by general formula V~VIII.

Particularly preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 6-24% of the compound represented by general formula I;

(2) 11~33% of compounds represented by general formula II;

(3) 22~65% of the compound represented by general formula III;

(4) 0-21% of the compound represented by general formula IV;

(5) 0~37% of the compound represented by general formula V~VIII.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2~14% of the compound represented by general formula I;

(2) 8~37% of the compound represented by general formula II;

(3) 20~70% of the compound represented by general formula III;

(4) 0-25% of the compound represented by general formula IV;

(5) 0~42% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2~14% of the compound represented by general formula I;

(2) 12~34% of the compound represented by general formula II;

(3) 22~65% of the compound represented by general formula III;

(4) 0-20% of the compound represented by general formula IV;

(5) 0~37% of the compound represented by general formula V~VIII.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1) 10-30% of the compound represented by general formula I;

(2) 8~35% of the compound represented by general formula II;

(3) 30~70% of the compound represented by general formula III;

(4) 0-25% of the compound represented by general formula IV;

(5) 0~36% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1) 10~24% of the compound represented by general formula I;

(2) 11-30% of the compound represented by general formula II;

(3) 32~65% of the compound represented by general formula III;

(4) 0-21% of the compound represented by general formula IV;

(5) 0~34% of the compound represented by general formula V~VIII.

The above-mentioned liquid crystal composition has a very large elastic constant and is very effective for improving the contrast of a liquid crystal display.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1) 5-18% of the compound represented by general formula I;

(2) 8~35% of the compound represented by general formula II;

(3) 20~70% of the compound represented by general formula III;

(4) 0-25% of the compound represented by general formula IV;

(5) 0~40% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 6-16% of the compound represented by general formula I;

(2) 11~33% of compounds represented by general formula II;

(3) 22~65% of the compound represented by general formula III;

(4) 0-20% of the compound represented by general formula IV;

(5) 0~37% of the compound represented by general formula V~VIII.

The above-mentioned liquid crystal composition has a large elastic constant and excellent low-temperature mutual solubility, and is very effective for improving the contrast of the liquid crystal display and broadening the low-temperature working range of the liquid crystal display.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-28% of the compound represented by general formula I;

(2) 15-40% of the compound represented by general formula II;

(3) 20-50% of the compound represented by general formula III;

(4) 0-25% of the compound represented by general formula IV;

(5) 0~40% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-24% of the compound represented by general formula I;

(2) 15~34% of the compound represented by general formula II;

(3) 22~47% of the compound represented by general formula III;

(4) 0-21% of the compound represented by general formula IV;

(5) 0~37% of the compound represented by general formula V~VIII.

The above liquid crystal composition has a large elastic constant and a large dielectric anisotropy, and is very effective for improving the contrast of the liquid crystal display and reducing the driving voltage of the liquid crystal display.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 5-28% of the compound represented by general formula I;

(2) 8-21% of the compound represented by general formula II;

(3) 30~70% of the compound represented by general formula III;

(4) 0-25% of the compound represented by general formula IV;

(5) 0~40% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 6-24% of the compound represented by general formula I;

(2) 11-21% of compounds represented by general formula II;

(3) 32~65% of the compound represented by general formula III;

(4) 0-21% of the compound represented by general formula IV;

(5) 0~34% of the compound represented by general formula V~VIII.

The above-mentioned liquid crystal composition has a large elastic constant and a low rotational viscosity, which is very effective for improving the contrast of the liquid crystal display and improving the response time.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-28% of the compound represented by general formula I;

(2) 8~38% of the compound represented by general formula II;

(3) 30-50% of the compound represented by general formula III;

(4) 1~36% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-24% of the compound represented by general formula I;

(2) 11~34% of the compound represented by general formula II;

(3) 32~47% of the compound represented by general formula III;

(4), 5~33% of the compounds represented by general formula V~VIII.

The above liquid crystal composition has a large elastic constant and a large dielectric anisotropy, and is very effective for improving the contrast of the liquid crystal display and reducing the driving voltage of the liquid crystal display.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 5-25% of the compound represented by general formula I;

(2) 8~35% of the compound represented by general formula II;

(3) 20~70% of the compound represented by general formula III;

(4) 1-25% of the compound represented by general formula IV;

(5) 0~40% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 7-20% of the compound represented by general formula I;

(2) 11-30% of the compound represented by general formula II;

(3) 22~65% of the compound represented by general formula III;

(4) 3~21% of the compound represented by general formula IV;

(5) 0~37% of the compound represented by general formula V~VIII.

Particularly preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1) 10-20% of the compound represented by general formula I;

(2) 12-27% of the compound represented by general formula II;

(3) 42~65% of the compound represented by general formula III;

(4), 6-21% of the compound represented by general formula IV.

The above-mentioned liquid crystal composition has a large elastic constant and a low rotational viscosity, and has excellent stability. It is very effective in improving the contrast of liquid crystal displays and increasing the response time. In addition, the liquid crystal display produced by the liquid crystal composition has very excellent Reliability.

Particularly preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 7 to 16% of the compound represented by general formula I;

(2) 11-30% of the compound represented by general formula II;

(3), 22~62% of the compound represented by general formula III;

(4) 3-18% of the compound represented by general formula IV;

(5) 4~37% of the compound represented by general formula V~VIII.

Preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2~26% of the compound represented by general formula I;

(2) 8~38% of the compound represented by general formula II;

(3) 20~65% of the compound represented by general formula III;

(4) 0-22% of the compound represented by general formula IV;

(5), 1~40% of the compound represented by general formula V~VIII.

More preferably, the liquid crystal composition provided by the present invention contains the following components by mass percentage:

(1), 2-24% of the compound represented by general formula I;

(2) Compounds represented by general formula II from 11 to 34;

(3), 22~62% of the compound represented by general formula III;

(4) 0-18% of the compound represented by general formula IV;

(5) 4~37% of the compound represented by general formula V~VIII.

The above liquid crystal composition has a large elastic constant and a large dielectric anisotropy, and is very effective for improving the contrast of the liquid crystal display and reducing the driving voltage of the liquid crystal display.

The preparation method of the liquid crystal composition of the present invention is not particularly limited. The conventional method can be used to mix two or more compounds for production, for example, by mixing different components at a high temperature and dissolving each other, wherein the liquid crystal composition Dissolve and mix in the solvent used for the compound, and then distill the solvent out under reduced pressure; or the liquid crystal composition of the present invention can be prepared according to a conventional method, such as mixing components with a smaller content in a higher It is obtained by dissolving in the main component with a large content at temperature, or dissolving each component in an organic solvent, such as acetone, chloroform or methanol, and then mixing the solution to remove the solvent.

Another object of the present invention is to protect the application of the liquid crystal composition of the present invention in LCD displays.

It is preferably used in IPS or FFS mode displays.

The present invention has the following beneficial effects:

The present invention increases the elastic constant of the liquid crystal composition by adding the compound represented by the general formula I, increases the dielectric anisotropy of the liquid crystal composition by increasing the compound of the general formula II, and increases the compound of the general formula III to reduce the rotational viscosity; the research of the present invention The personnel found that the compound represented by the general formula I has a very large elastic constant and a low rotational viscosity, which can improve the elastic constant of the liquid crystal composition while maintaining the rotational viscosity unchanged, thereby meeting the high contrast required by liquid crystal displays. And the purpose of quick response.

The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

Unless otherwise specified, percentages in the present invention are weight percentages; temperature units are degrees Celsius; △n represents optical anisotropy (25°C); ε _∥ and ε _⊥ represent parallel and perpendicular dielectric constants (25°C, 1000 Hz), respectively; △ε represents the dielectric anisotropy (25℃, 1000Hz); γ1 represents the rotational viscosity (mPa.s, 25℃); Cp represents the clearing point (℃) of the liquid crystal composition; K ₁₁ , K ₂₂ , and K ₃₃ represent respectively Spreading, twisting and bending elastic constant (pN, 25℃); Kavg represents the average elastic constant ((K ₁₁ +K ₂₂ +K ₃₃ )/3, pN, 25℃)

In the following examples, the group structure in the liquid crystal composition is represented by the code shown in Table 1.

Take the following compound structure as an example:

Expressed as: 4CDUQKF

Expressed as: 5CCPUF

In the following embodiments, the preparation of the liquid crystal composition adopts the thermal dissolution method, which includes the following steps: weigh the liquid crystal composition by weight with a balance, wherein the order of weighing and adding is not specified. The liquid crystal composition is usually weighed and mixed in the order of the melting point of the liquid crystal composition from high to low, heated and stirred at 60~100°C to make the components melt uniformly, filtered, revolved, and finally packaged to obtain the target sample.

In the following examples, the weight percentage of each component in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following table.

Example 1

Example 2

Example 3

Table 4: Weight percentages and performance parameters of each component in the liquid crystal composition

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Example 11

Table 12: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 12

Example 13

Example 14

Table 15: Weight percentages and performance parameters of each component in the liquid crystal composition

Example 15

Example 16

Example 17

Example 18

Example 19

Example 20

Example 21

Example 22

Example 23

Example 24

Example 25

Example 26

Example 27

Example 28

Example 29

Example 30

Example 31

Example 32

Table 33: Weight percentages and performance parameters of each component in the liquid crystal composition

Example 33

Example 34

Example 35

Example 36

Example 37

Example 38

Example 39

Example 40

Example 41

Comparative example 1

The performance parameter values of the liquid crystal compositions obtained in Example 1 and Comparative Example 1 are summarized and compared, see Table 44.

It can be seen from comparison that the liquid crystal composition provided in Example 1 has a larger elastic constant compared with Comparative Example 1, and the elastic constant of Example 1 is increased by about 20%, that is, when used in a liquid crystal display, the contrast ratio can be increased by about 20%. .

It can be seen from the above embodiments that the liquid crystal composition provided by the present invention has a large elastic constant and can effectively improve the contrast of liquid crystal displays when used in IPS and FFS mode displays. Therefore, the IPS or FFS type TFT liquid crystal display device to which the liquid crystal composition provided by the present invention is applicable can improve the dark state light leakage problem of the liquid crystal display, can significantly improve the contrast of the liquid crystal display, and can improve the contrast characteristics of the IPS or FFS mode liquid crystal display .

Although the general description and specific embodiments have been used to describe the present invention in detail above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention belong to the scope of the present invention.

Claims (14)

A liquid crystal composition containing 2-methyl-3,4,5 trifluorobenzene structure, characterized in that the liquid crystal composition includes one or more compounds represented by the general formula I:

Wherein, R ₁ and R ₂ each independently represent a C ₁ to C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ to C ₁₂ linear alkenyl group; The liquid crystal composition includes at least one compound represented by the general formula II:

Wherein, R ₃ each independently represents a C ₁ to C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ to C ₁₂ linear alkenyl group; n ₁ =0 or 1; A ₁ each independently represents:

A2 each independently represents:

A3 each independently represents:

The liquid crystal composition contains at least one compound represented by the general formula III:

Wherein, R ₄ and R ₅ each independently represent a C ₁ ~C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ ~C ₁₂ linear alkenyl group, and A ₄ , A ₅ each independently represent a trans 1,4-cyclohexyl or 1,4-phenylene. The liquid crystal composition according to claim 1, wherein the compound represented by the general formula I is selected from one or more of IA to IB:

Wherein, R ₁ and R ₂ each independently represent a C ₁ to C ₇ linear alkyl group or a C ₂ to C ₇ linear alkenyl group; Preferably, the compound represented by the general formula I is selected from one or more of the formulas IA1 to IB45:

More preferably, the compound of Formula I is selected from one or more of IA3, IA12, IA21, IA23, IA24, IA25, IA39, IA43, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31; in particular Preferably, the compound of formula I is selected from one or more of IA3, IA21, IA23, IA24, IA25, IA39, IA43, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31 Species; most preferably, the compound of formula I is selected from one or more of IA3, IA21, IA23, IA39, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31; And/or, the liquid crystal composition contains the compound of general formula I with a mass percentage of 1~35%; preferably, the mass percentage is 2~30%, 2~14%, 10~30%, 5~18%, 2~ 28%, 5~28%, 5~25% or 2~26% of the compound of general formula I; more preferably the quality percentage is 2~24%, 7~20%, 7~16%, 6~24%, 6 ~16%, 10~24% or 2~14% of the compound represented by general formula I. A compound according to claim 1, wherein the compound represented by the general formula II is selected from one or more of IIA to IIM:

Preferably, the compound represented by the general formula II is selected from one or more of the formula IIA1~IIM5:

More preferably, the compound of formula II is selected from formula IIA3, IIB2, IIB3, IIC2, IIC3, IID2, IID3, IIF3, IIG3, IIG4, IIH3, IIH4, IIH5, IIJ3, IIK2, IIK3, IIL3, IIM3, IIM4 Particularly preferably, the compound of general formula II is selected from one or more of formula IIB3, IIC2, IIC3, IID3, IIF3, IIG3, IIG4, IIH3, IIH4, IIH5, IIK3, IIL3, IIM3, IIM4; Most preferably, the compound of formula II is selected from one or more of formula IIB3, IIC2, IIC3, IID3, IIG3, IIG4, IIH3, IIH4, IIH5, IIL3, IIM3, IIM4; And/or, the liquid crystal composition contains 5-50% of the compound represented by the general formula II; more preferably, the liquid crystal composition contains 8-37%, 8-40%, 8-35%, 15% 40%, 8~21%, 8~38% of the compound represented by general formula II; particularly preferably, the liquid crystal composition contains 11~34%, 11~30%, 12~27%, 11~30% , 11~34%, 11~21%, 15~34%, 11~33%, 12~34% of the compound represented by general formula II. A liquid crystal composition according to claim 1, wherein the compound represented by the general formula III is selected from one or more of the formulas IIIA to IIIC:

Wherein, R ₄ each independently represents a C ₁ ~C ₇ linear alkyl group; R ₅ each independently represents a C ₁ ~C ₇ linear alkyl group, a linear alkoxy group or a C ₂ ~C _{7 linear alkyl group} Alkenyl Preferably, the compound represented by the general formula III is selected from one or more of the formulas IIIA1 to IIIC24:

More preferably, the compound represented by the general formula III is selected from one or more of IIIA3, IIIA7, IIIA11, IIIA12, IIIA25, IIIA29, IIIA31, IIIA37, IIIB18, IIIB22, IIIC2, IIIC4, IIIC15, and IIIC20; particularly preferably, The compound represented by the general formula III is selected from one or more of IIIA25, IIIA29, IIIA37, IIIB18, IIIB22, IIIC2, IIIC4, IIIC15, and IIIC20; And/or, the liquid crystal composition contains 10~75% of the compound represented by the general formula III; more preferably, the liquid crystal composition contains 20~70%, 30~70%, 20~50%, 30~ 50%, 20~65% of the compound represented by the general formula III; particularly preferably, the liquid crystal composition contains 22~62%, 42~65%, 22~65%, 32~47%, 32~65% , 22~47% of the compound represented by general formula III. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by the general formula IV:

Wherein, R ₆ and R ₇ each independently represent a C ₁ ~C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ ~C ₁₂ linear alkenyl group; A ₆ each independently represents a trans 1,4 -Cyclohexyl or 1,4-phenylene; Preferably, the compound represented by the general formula IV is selected from one or two of IVA to IVB:

Wherein, R ₆ and R ₇ each independently represent a C ₁ to C ₇ linear alkyl group, a linear alkoxy group or a C ₂ to C ₇ linear alkenyl group; Preferably, the compound represented by the general formula IV is selected from one or more of IVA1 to IVB62:

More preferably, the compound represented by general formula IV is selected from one or more of IVA3, IVA5, IVA8, IVA10, IVA26, IVA31, IVA33, IVA53, IVB3, IVB5, IVB8, IVB10, IVB13, IVB25, IVB30, IVB35; Particularly preferably, the compound of general formula IV provided by the present invention is selected from one or more of IVA3, IVA8, IVA10, IVA26, IVA31, IVA33, IVA53, IVB3, IVB8, IVB13, IVB25, IVB30, IVB35; And/or, the liquid crystal composition contains 0~35% of the compound represented by general formula IV; more preferably, the liquid crystal composition contains 0~25%, 0~21%, 0~20%, 1~ 25%, 0-22%, 0-18% of the compound represented by the general formula IV; particularly preferably, the liquid crystal composition contains 3-21%, 6-21%, 3-18% of the compound represented by the general formula IV Representative compound. A positive liquid crystal composition according to claim 1 or 5, characterized in that the positive liquid crystal composition further comprises one or more compounds represented by the general formula V:

Wherein, R ₈ each independently represents a C ₁ to C ₁₂ linear alkyl group, a linear alkoxy group or a C ₂ to C ₁₂ linear alkenyl group; X ₁ each independently represents F, CF ₃ , OCF ₃ ; L ₁ and L ₂ each independently represent H or F; A ₇ each independently represents:

Preferably, the compound represented by the general formula V is selected from one or more of VA to VK:

More preferably, R ₈ each independently represents a C ₁ to C ₇ linear alkyl group or a C ₂ to C ₇ linear alkenyl group; X ₁ each independently represents F, CF ₃ or OCF ₃ ; More preferably, R ₈ each independently represents a C ₁ to C ₅ linear alkyl group or a C ₂ to C ₅ linear alkenyl group; X ₁ each independently represents F, CF ₃ or OCF ₃ . A liquid crystal composition according to claim 1 or 5, characterized in that the liquid crystal composition further comprises one or more compounds represented by the general formula VI:

Wherein, R ₉ and R ₁₀ each independently represent F, a C ₁ to C ₁₂ linear alkyl group or a C ₂ to C ₁₂ linear alkenyl group; Preferably, the compound represented by the general formula VI is selected from one or more of VIA or VIB:

Wherein, R ₉ and R ₁₀ each independently represent a C ₁ to C ₇ linear alkyl group or a C ₄ to C ₅ linear alkenyl group; Further preferably, R ₉ and R ₁₀ each independently represent a C ₁ to C ₅ linear alkyl group or a C ₄ to C ₅ linear alkenyl group. The liquid crystal composition according to claim 6, wherein the liquid crystal composition further comprises one or more compounds represented by the general formula VI:

Wherein, R ₉ and R ₁₀ each independently represent F, a C ₁ to C ₁₂ linear alkyl group or a C ₂ to C ₁₂ linear alkenyl group; Preferably, the compound represented by the general formula VI is selected from one or more of VIA or VIB:

Wherein, R ₉ and R ₁₀ each independently represent a C ₁ to C ₇ linear alkyl group or a C ₄ to C ₅ linear alkenyl group; Further preferably, R ₉ and R ₁₀ each independently represent a C ₁ to C ₅ linear alkyl group or a C ₄ to C ₅ linear alkenyl group. The liquid crystal composition according to claim 1 or 5, wherein the liquid crystal composition further comprises a compound represented by general formula VII or general formula VIII:

Wherein, R ₁₁ , R ₁₂ , and R ₁₃ each independently represent a linear alkyl group of _{C 1} to C _{12 ; L 3} , L ₄ , and L ₅ each independently represent H or F; X2 each independently represents F, CF ₃ , OCF ₃ ; Preferably, the compound represented by general formula VII is selected from compounds represented by VIIA or VIIB:

R ₁₁ and R ₁₂ each independently represent a C ₁ to C ₅ linear alkyl group; More preferably, the compound represented by the general formula VIII is selected from one or more of VIIIA to VIIIJ:

Wherein, R ₁₃ each independently represents a C ₁ -C ₇ linear alkyl group; Preferably, R ₁₃ each independently represents a C ₁ to C ₅ linear alkyl group. The liquid crystal composition according to claim 6, wherein the liquid crystal composition further comprises a compound represented by general formula VII or general formula VIII:

Wherein, R ₁₁ , R ₁₂ , and R ₁₃ each independently represent a linear alkyl group of _{C 1} to C _{12 ; L 3} , L ₄ , and L ₅ each independently represent H or F; X2 each independently represents F, CF ₃ , OCF ₃ ; Preferably, the compound represented by general formula VII is selected from compounds represented by VIIA or VIIB:

R ₁₁ and R ₁₂ each independently represent a C ₁ to C ₅ linear alkyl group; More preferably, the compound represented by the general formula VIII is selected from one or more of VIIIA to VIIIJ:

Wherein, R ₁₃ each independently represents a C ₁ -C ₇ linear alkyl group; Preferably, R ₁₃ each independently represents a C ₁ to C ₅ linear alkyl group. The liquid crystal composition according to claim 7, wherein the liquid crystal composition further comprises a compound represented by general formula VII or general formula VIII:

Wherein, R ₁₁ , R ₁₂ , and R ₁₃ each independently represent a linear alkyl group of _{C 1} to C _{12 ; L 3} , L ₄ , and L ₅ each independently represent H or F; X2 each independently represents F, CF ₃ , OCF ₃ ; Preferably, the compound represented by general formula VII is selected from compounds represented by VIIA or VIIB:

R ₁₁ and R ₁₂ each independently represent a C ₁ to C ₅ linear alkyl group; More preferably, the compound represented by the general formula VIII is selected from one or more of VIIIA to VIIIJ:

Wherein, R ₁₃ each independently represents a C ₁ -C ₇ linear alkyl group; Preferably, R ₁₃ each independently represents a C ₁ to C ₅ linear alkyl group. The liquid crystal composition according to claim 8, wherein the liquid crystal composition further comprises a compound represented by general formula VII or general formula VIII:

Wherein, R ₁₁ , R ₁₂ , and R ₁₃ each independently represent a linear alkyl group of _{C 1} to C _{12 ; L 3} , L ₄ , and L ₅ each independently represent H or F; X2 each independently represents F, CF ₃ , OCF ₃ ; Preferably, the compound represented by general formula VII is selected from compounds represented by VIIA or VIIB:

R ₁₁ and R ₁₂ each independently represent a C ₁ to C ₅ linear alkyl group; More preferably, the compound represented by the general formula VIII is selected from one or more of VIIIA to VIIIJ:

Wherein, R ₁₃ each independently represents a C ₁ -C ₇ linear alkyl group; Preferably, R ₁₃ each independently represents a C ₁ to C ₅ linear alkyl group. The liquid crystal composition according to claim 12, characterized in that it comprises the following components in percentage by mass: (1) 1~35% of the compound represented by general formula I; (2), 5-50% of the compound represented by general formula II; (3) 10~75% of the compound represented by general formula III; (4) 0~35% of the compound represented by general formula IV; (5) 0~50% of the compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-30% of the compound represented by general formula I; (2) 8-40% of the compound represented by general formula II; (3) 20~70% of the compound represented by general formula III; (4) 0-25% of the compound represented by general formula IV; (5) 0~43% of compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-24% of the compound represented by general formula I; (2) 11~34% of the compound represented by general formula II; (3) 22~65% of the compound represented by general formula III; (4) 0-21% of the compound represented by general formula IV; (5) 0~37% of compounds represented by general formula V~VIII; Particularly preferably, the liquid crystal composition contains the following components by mass percentage: (1), 6-24% of the compound represented by general formula I; (2) 11~33% of compounds represented by general formula II; (3) 22~65% of the compound represented by general formula III; (4) 0-21% of the compound represented by general formula IV; (5) 0~37% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2~14% of the compound represented by general formula I; (2) 8~37% of the compound represented by general formula II; (3) 20~70% of the compound represented by general formula III; (4) 0-25% of the compound represented by general formula IV; (5) 0~42% of compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2~14% of the compound represented by general formula I; (2) 12~34% of the compound represented by general formula II; (3) 22~65% of the compound represented by general formula III; (4) 0-20% of the compound represented by general formula IV; (5) 0~37% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1) 10-30% of the compound represented by general formula I; (2) 8~35% of the compound represented by general formula II; (3) 30~70% of the compound represented by general formula III; (4) 0-25% of the compound represented by general formula IV; (5) 0~36% of compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1) 10~24% of the compound represented by general formula I; (2) 11-30% of the compound represented by general formula II; (3) 32~65% of the compound represented by general formula III; (4) 0-21% of the compound represented by general formula IV; (5) 0~34% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1) 5-18% of the compound represented by general formula I; (2) 8~35% of the compound represented by general formula II; (3) 20~70% of the compound represented by general formula III; (4) 0-25% of the compound represented by general formula IV; (5) 0~40% of the compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 6-16% of the compound represented by general formula I; (2) 11~33% of compounds represented by general formula II; (3) 22~65% of the compound represented by general formula III; (4) 0-20% of the compound represented by general formula IV; (5) 0~37% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-28% of the compound represented by general formula I; (2) 15-40% of the compound represented by general formula II; (3) 20-50% of the compound represented by general formula III; (4) 0-25% of the compound represented by general formula IV; (5) 0~40% of the compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-24% of the compound represented by general formula I; (2) 15~34% of the compound represented by general formula II; (3) 22~47% of the compound represented by general formula III; (4) 0-21% of the compound represented by general formula IV; (5) 0~37% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 5-28% of the compound represented by general formula I; (2) 8-21% of the compound represented by general formula II; (3) 30~70% of the compound represented by general formula III; (4) 0-25% of the compound represented by general formula IV; (5) 0~40% of the compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 6-24% of the compound represented by general formula I; (2) 11-21% of compounds represented by general formula II; (3) 32~65% of the compound represented by general formula III; (4) 0-21% of the compound represented by general formula IV; (5) 0~34% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-28% of the compound represented by general formula I; (2) 8~38% of the compound represented by general formula II; (3) 30-50% of the compound represented by general formula III; (4) 1~36% of compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-24% of the compound represented by general formula I; (2) 11~34% of the compound represented by general formula II; (3) 32~47% of the compound represented by general formula III; (4) 5~33% of the compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 5-25% of the compound represented by general formula I; (2) 8~35% of the compound represented by general formula II; (3) 20~70% of the compound represented by general formula III; (4) 1-25% of the compound represented by general formula IV; (5) 0~40% of the compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 7-20% of the compound represented by general formula I; (2) 11-30% of the compound represented by general formula II; (3) 22~65% of the compound represented by general formula III; (4) 3~21% of the compound represented by general formula IV; (5) 0~37% of compounds represented by general formula V~VIII; Particularly preferably, the liquid crystal composition contains the following components by mass percentage: (1) 10-20% of the compound represented by general formula I; (2) 12-27% of the compound represented by general formula II; (3) 42~65% of the compound represented by general formula III; (4), 6-21% of the compound represented by general formula IV; Particularly preferably, the liquid crystal composition contains the following components by mass percentage: (1), 7 to 16% of the compound represented by general formula I; (2) 11-30% of the compound represented by general formula II; (3), 22~62% of the compound represented by general formula III; (4) 3-18% of the compound represented by general formula IV; (5) 4~37% of compounds represented by general formula V~VIII; Preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2~26% of the compound represented by general formula I; (2) 8~38% of the compound represented by general formula II; (3) 20~65% of the compound represented by general formula III; (4) 0-22% of the compound represented by general formula IV; (5), 1~40% of the compounds represented by general formula V~VIII; More preferably, the liquid crystal composition contains the following components by mass percentage: (1), 2-24% of the compound represented by general formula I; (2) 11~34% of the compound represented by general formula II; (3), 22~62% of the compound represented by general formula III; (4) 0-18% of the compound represented by general formula IV; (5) 4~37% of the compound represented by general formula V~VIII. An application of the liquid crystal composition according to claim 13 in an LCD display; preferably an application in an IPS or FFS mode display.