Liquid crystal composition and element thereof

Abstract

The invention belongs to the technical field of liquid crystal compositions, and particularly relates to a liquid crystal composition and an element thereof, and the liquid crystal composition comprises the following components in percentage by total weight of the liquid crystal composition: 5%-88% of a component I, 10%-50% of a component II, 1%-25% of a component III and 1%-20% of a component IV. The liquid crystal composition disclosed by the invention has the characteristics of high contrast ratio, high response speed and good high and low temperature tolerance.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal compositions, and in particular relates to a liquid crystal composition and a component thereof. Background Art

[0002] Depending on the control methods and principles, the dimming device can switch between transparent and opaque states or between high transmittance (transparent state) and low transmittance (dark state) through various methods such as electrical control, temperature control, light control, and voltage control. Electrically controlled liquid crystal is the most widely used dimming method for dimming devices on the market. After power is applied, the liquid crystal molecules are arranged according to the electric field and appear transparent to light. After power is removed, the liquid crystal molecules are naturally arranged and appear opaque to light.

[0003] Liquid crystal compositions used in electrically controlled dimming devices need to have a wide range of liquid crystal phases, high transmittance in the transparent state and low transmittance in the dark state, that is, good contrast characteristics, while taking into account fast response speed, which is a constantly pursued goal. Dimming devices for outdoor applications will be challenged by extremely cold and hot application scenarios, and the demand for liquid crystal compositions with good high and low temperature tolerance is particularly urgent. However, due to the inherent contradiction between the birefringence and the fluidity of the liquid crystal molecules, the liquid crystal compositions in the prior art are usually unable to simultaneously take into account the comprehensive effects of good contrast characteristics, fast response speed, and good high and low temperature tolerance. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the liquid crystal compositions in the prior art that cannot simultaneously take into account good contrast characteristics, fast response speed, and good high and low temperature tolerance, and to provide a liquid crystal composition and its element. The liquid crystal composition of the present invention has the characteristics of high contrast, fast response speed, and good high and low temperature tolerance.

[0005] In order to achieve the above object, in a first aspect, the present invention provides a liquid crystal composition, comprising: Component 1 is selected from at least one of the compounds of formula I, wherein R 1 represents an alkyl group having 2 to 7 carbon atoms; Component 2, which is selected from at least one of the compounds represented by formula II-1, formula II-2, and formula II-3, wherein R 2 , R 4 , R 7 Each independently represents an alkyl group having 2 to 5 carbon atoms; Component three, which is selected from at least one of the group consisting of compounds represented by formula III-1, formula III-2, formula III-3, formula III-4, and formula III-5, wherein R 3 , R 5 , R 6 , R 8 , R9 Each independently represents an alkyl group having 2 to 7 carbon atoms; Component 4, which is selected from at least one of the compounds represented by formula IV-1, formula IV-2, and formula IV-3, wherein X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 Each independently represents hydrogen or fluorine, R 0 It represents an alkyl group having 1 to 12 carbon atoms, one or more hydrogen atoms in the alkyl group may be independently substituted by fluorine atoms, and P1 and P2 each independently represent 4, 5, 6, 7 or 8.

[0006] Wherein, based on the total weight of the liquid crystal composition, the content of component one is 5%-88%, the content of component two is 10%-50%, the content of component three is 1%-25%, and the content of component four is 1%-20%.

[0007] The general formulas are as follows:

[0008]

[0009]

[0010] .

[0011] In some preferred embodiments of the present invention, the total weight content of F is 2%-6%, preferably 3%-5%, based on the total weight of the liquid crystal composition.

[0012] In some preferred embodiments of the present invention, based on the total weight of the liquid crystal composition, the weight ratio of the total amount of F contained to the total amount of aromatic groups contained is 1:(1-5), preferably 1:2-4.

[0013] In some preferred embodiments of the present invention, the content of component 1 is 20%-55% based on the total weight of the liquid crystal composition.

[0014] In some preferred embodiments of the present invention, component one includes a compound represented by formula Id, and at least one selected from the group consisting of compounds represented by formula Ia, formula Ib, formula Ic, and formula Ie, wherein the sum of the contents of the compounds represented by formula Ia, formula Ib, formula Ic, formula Id, and formula Ie is 20%-50% based on the total weight of the liquid crystal composition.

[0015] Among them, the general formulas are as follows: .

[0016] More preferably, based on the total weight of the liquid crystal composition, the content of the compound represented by formula Ia is 0-10%, the content of the compound represented by formula Ib is 0-10%, the content of the compound represented by formula Ic is 0-10%, the content of the compound represented by formula Id is 10%-20%, preferably 10%-15%, and the content of the compound represented by formula Ie is 0-10%.

[0017] In some preferred embodiments of the present invention, in component two, the compound represented by general formula II-1 is selected from the compound represented by formula II-1-a and / or the compound represented by formula II-1-b, the compound represented by general formula II-2 is selected from the group consisting of the compound represented by formula II-2-a, the compound represented by formula II-2-b and the compound represented by formula II-2-c, and the compound represented by general formula II-3 is selected from the compound represented by formula II-3-a and / or the compound represented by formula II-3-b; wherein, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by formula II-1-a, formula II-1-b, formula II-2-a, formula II-2-b, formula II-2-c, formula II-3-a, and formula II-3-b is 15%-45%.

[0018] Among them, the general formulas are as follows: .

[0019] More preferably, in the component two, based on the total weight of the liquid crystal composition, the content of the compound represented by formula II-1-a is 3%-7%, the content of the compound represented by formula II-1-b is 4%-7%, the content of the compound represented by formula II-2-a is 0-6%, the content of the compound represented by formula II-2-b is 0-6%, the content of the compound represented by formula II-2-c is 0-5%, the content of the compound represented by formula II-3-a is 4%-10%, and the content of the compound represented by formula II-3-b is 4%-10%.

[0020] In some preferred embodiments of the present invention, in the component three, the compound represented by the general formula III-1 is selected from the compound represented by the formula III-1-a and / or the compound represented by the formula III-1-b, the compound represented by the general formula III-2 is selected from the compound represented by the formula III-2-a and / or the compound represented by the formula III-2-b, the compound represented by the general formula III-3 is selected from the compound represented by the formula III-3-a and / or the compound represented by the formula III-3-b, the compound represented by the general formula III-4 is selected from the compound represented by the formula III-4-a and / or the compound represented by the formula III-4-b, and the compound represented by the general formula III-5 is selected from the compound represented by the formula III-5-a and / or the compound represented by the formula III-5-b. Wherein, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by the formula III-1-a, formula III-1-b, formula III-2-a, formula III-2-b, formula III-3-a, formula III-3-b, formula III-4-a, formula III-4-b, formula III-5-a, and formula III-5-b is 3%-22%.

[0021] Among them, the general formulas are as follows: .

[0022] More preferably, based on the total weight of the liquid crystal composition, the content of the compound shown in formula III-1-a is 0-1%, the content of the compound shown in formula III-1-b is 0-3%, the content of the compound shown in formula III-2-a is 0-3%, the content of the compound shown in formula III-2-b is 0-1%, the content of the compound shown in formula III-3-a is 0-4%, the content of the compound shown in formula III-3-b is 0-4%, the content of the compound shown in formula III-4-a is 0-2%, the content of the compound shown in formula III-4-b is 0-3%, the content of the compound shown in formula III-5-a is 0-4%, and the content of the compound shown in formula III-5-b is 0-5%.

[0023] More preferably, the component four contains at least one of the compounds represented by the general formula IV-1, and the total content of the compounds represented by the general formula IV-1 is 1%-15% based on the total weight of the liquid crystal composition.

[0024] More preferably, the component four contains at least one of the compounds represented by the general formula IV-3, and the total content of the compounds represented by the general formula IV-3 is 1%-20% based on the total weight of the liquid crystal composition.

[0025] In some preferred embodiments of the present invention, the liquid crystal composition further comprises a component five, which is selected from at least one of the compounds represented by the general formula V-1, the general formula V-2, the general formula V-3, and the general formula V-4, wherein R 10 , R 12, R 13 , R 14 Each independently represents an alkyl group having 2 to 7 carbon atoms, R 11 represents an alkoxy group having 1 to 2 carbon atoms or an alkyl group having 2 to 7 carbon atoms, L 1 , L 2 Each independently represents H or F, and ring B and ring C each independently represent cyclohexane or a benzene ring; the content of component five in the liquid crystal composition is 5%-15%.

[0026] Among them, the general formulas are as follows: .

[0027] Further preferably, R in the component 5 11 represents a methoxy group, an ethoxy group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group or an n-heptyl group.

[0028] In a second aspect, the present invention further provides a device comprising the liquid crystal composition described in the first aspect.

[0029] In some preferred embodiments of the present invention, the component is an electrically controlled dimming device.

[0030] The dimming device may include, for example, at least one of a display device, a dimming window, a smart window, and the like.

[0031] Beneficial effects: The inventors of the present invention have found that fluorine atoms have the greatest electronegativity, have a strong binding effect on electrons, and the distribution of CF bond electron clouds is not easily affected. Therefore, polyfluorinated compounds have small intermolecular forces. This characteristic can reduce the performance changes caused by changes in intermolecular forces when the environment changes, especially when the temperature changes. And because polyfluorinated compounds also have many characteristics, such as a unique "fluorocarbon phase" and large intermolecular gaps, polyfluorinated compounds can be used to affect the high and low temperature stability of liquid crystal compositions. However, the relationship between the structure of polyfluorinated compounds and the high and low temperature stability of liquid crystal compositions is not clear, so it is necessary to further study the types of polyfluorinated compounds and the types of liquid crystal composition components and their feasible ratios. Based on this, the present invention is proposed.

[0032] The present invention innovatively combines the polyfluorinated compound of the specific component four with several types of specific polycyclic compounds of other components one, two, and three in a specific proportion, which can achieve the high birefringence of component one and the synergy of component four, reduce light scattering, reduce viscosity and improve fluidity with component four and component three with the rigid core to form a dynamic balance, inhibit phase separation, so that the liquid crystal composition can simultaneously take into account the comprehensive effects of high contrast, fast response speed, and good high and low temperature tolerance. One possible explanation is that the rigid fluorinated aromatic core of the tetrafluoro compound provides high birefringence, while its side chain perfluoroalkyl reduces intermolecular interactions through the "fluorine shielding effect", thereby inhibiting anisotropic decay at high temperatures and maintaining low viscosity at low temperatures. At the same time, it forms π-π stacking and fluorine-aromatic ring dipole interactions with polycyclic compounds (such as cyanobiphenyl of component one), enhancing the molecular orientation order and further improving the contrast and response speed.

[0033] Furthermore, in the preferred F content or the ratio of F to the total amount of aromatic groups of the present invention, the polar and non-polar interactions can be balanced, which is more conducive to improving the molecular arrangement and compatibility, thereby further facilitating the liquid crystal composition to have a comprehensive effect of high contrast, fast response speed, and good high and low temperature tolerance. DETAILED DESCRIPTION

[0034] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article. Among them, the terms "optional" and "optional" all mean that they may be included or not included (or may be present or not).

[0035] The general formulae mentioned in the specific embodiments of the present invention are the same as the corresponding general formulae in the aforementioned summary of the invention.

[0036] The present invention provides a liquid crystal composition, comprising: component one, component two, component three and component four. Wherein, based on the total weight of the liquid crystal composition, the content of component one is 5%-88%, the content of component two is 10%-50%, the content of component three is 1%-25%, and the content of component four is 1%-20%.

[0037] In some preferred embodiments of the present invention, based on the total weight of the liquid crystal composition, the total weight content of F is 2%-6%, specifically, for example, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6.0% and the range between any two point values, more preferably 3%-5%. The preferred embodiment of the present invention is more conducive to balancing the polarity and non-polarity interaction of the liquid crystal composition.

[0038] In some preferred embodiments of the present invention, based on the total weight of the liquid crystal composition, the weight ratio of the total amount of F contained to the total amount of aromatic groups contained is 1: (1-5), for example, it can be 1: 1.0, 1: 1.2, 1: 1.5, 1: 1.7, 1: 2.0, 1: 2.2, 1: 2.5, 1: 2.8, 1: 3.0, 1: 3.1, 1: 3.2, 1: 3.3, 1: 3.4, 1: 3.5, 1: 3.6, 1: 3.7, 1: 3.8, 1: 3.9, 1: 4.0, 1: 4.2, 1: 4.5, 1: 4.7, 1: 5.0 and the range between any two point values, more preferably 1: (2-4). In this preferred embodiment, the weight ratio of the total amount of F contained to the total amount of aromatic groups contained is appropriate, which can optimize the intermolecular interaction and compatibility, and is more conducive to improving the high and low temperature stability, response speed and optical properties of the liquid crystal composition.

[0039] In the present invention, the aromatic group includes a substituted or unsubstituted phenyl group.

[0040] Component 1 of the present invention is selected from at least one of the compounds shown in general formula I, wherein R 1 represents an alkyl group having 2 to 7 carbon atoms. 1 The number of carbon atoms in the alkyl group is 2-7, for example, 2, 3, 4, 5, 6, or 7. The alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group. For example, when the number of carbon atoms is 4, R 1 Can represent CH 3 -CH 2 -CH 2 -CH 2 -、-CH 2 CH 2 CH 2 CH 3 、-CH(CH 3 )CH2 CH 3 、-CH 2 CH(CH 3 ) 2 or -C(CH 3 ) 3 .

[0041] In the present invention, the abbreviation codes corresponding to some structural formulas are shown in Table 1 below.

[0042] Table 1

[0043] Exemplarily, component one can be selected from C 2 H 5 -Ph-Ph-CN, C 3 H 7 -Ph-Ph-CN, C 4 H 9 -Ph-Ph-CN, C 5 H 11 -Ph-Ph-CN, C 6 H 13 -Ph-Ph-CN, C 7 H 15 -Ph-Ph-CN.

[0044] In some preferred embodiments of the present invention, the content of component 1 is 20%-55% based on the total weight of the liquid crystal composition.

[0045] In some preferred embodiments of the present invention, the component one includes a compound of formula Id and at least one selected from the group consisting of compounds of formula Ia, formula Ib, formula Ic, and formula Ie. It is understood that component one includes a compound of formula Id and other compounds, and the other compounds are at least one selected from the group consisting of compounds of formula Ia, formula Ib, formula Ic, and formula Ie.

[0046] Among them, the general formulas are as follows: .

[0047] Preferably, the total content of the compounds represented by Formula Ia, Formula Ib, Formula Ic, Formula Id, and Formula Ie is 20%-50% based on the total weight of the liquid crystal composition. Under this preferred embodiment, the ratio is suitable, because the light modulation ability and driving efficiency of the liquid crystal composition can be significantly improved, which is more conducive to achieving high contrast and fast response.

[0048] More preferably, based on the total weight of the liquid crystal composition, the content of the compound represented by formula Ia is 0-10%, the content of the compound represented by formula Ib is 0-10%, the content of the compound represented by formula Ic is 0-10%, the content of the compound represented by formula Id is 10%-20%, and the content of the compound represented by formula Ie is 0-10%.

[0049] Further preferably, based on the total weight of the liquid crystal composition, the content of the compound represented by formula Ia is 5%-10%, the content of the compound represented by formula Ib is 6%-8%, the content of the compound represented by formula Ic is 0-8%, the content of the compound represented by formula Id is 10%-14%, and the content of the compound represented by formula Ie is 5%-9%. Under this preferred embodiment, the proportion of each compound is appropriate, which is more conducive to optimizing the arrangement of liquid crystal molecules.

[0050] Component 2 of the present invention is at least one selected from the group consisting of compounds represented by formula II-1, formula II-2, and formula II-3, wherein R 2 , R 4 , R 7 Each independently represents an alkyl group having 2 to 5 carbon atoms. 2 , R 4 , R 7 The alkyl groups may be the same or different. The alkyl group may be a straight chain alkyl group or a branched chain alkyl group. The number of carbon atoms in the alkyl group is 2-5, for example, 2, 3, 4, or 5.

[0051] .

[0052] Exemplarily, component two can be selected from C 2 H 5 -Ch-Ph-Ph-CN, C 3 H 7 -Ch-Ph-Ph-CN, C 4 H 9 -Ch-Ph-Ph-CN, C 5 H 11 -Ch-Ph-Ph-CN, C 2 H 5 -Ch-COO-Ph-Ph-CN, C 3 H 7 -Ch-COO-Ph-Ph-CN, C 4 H 9 -Ch-COO-Ph-Ph-CN, C 5 H 11 -Ch-COO-Ph-Ph-CN, C 2 H 5 -Ch-Ph-Ph(3F)-CN、C3 H 7 -Ch-Ph-Ph(3F)-CN、C 4 H 9 -Ch-Ph-Ph(3F)-CN、C 5 H 11 -Ch-Ph-Ph(3F)-CN.

[0053] In some preferred embodiments of the present invention, in component two, the compound represented by general formula II-1 is selected from the compound represented by formula II-1-a and / or the compound represented by formula II-1-b, the compound represented by general formula II-2 is selected from the group consisting of the compound represented by formula II-2-a, the compound represented by formula II-2-b and the compound represented by formula II-2-c, and the compound represented by general formula II-3 is selected from the compound represented by formula II-3-a and / or the compound represented by formula II-3-b; wherein, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by formula II-1-a, formula II-1-b, formula II-2-a, formula II-2-b, formula II-2-c, formula II-3-a, and formula II-3-b is 15%-45%.

[0054] The general formulas are as follows: .

[0055] Preferably, in the component two, based on the total weight of the liquid crystal composition, the content of the compound represented by formula II-1-a is 3%-7%, the content of the compound represented by formula II-1-b is 4%-7%, the content of the compound represented by formula II-2-a is 0-6%, the content of the compound represented by formula II-2-b is 0-6%, the content of the compound represented by formula II-2-c is 0-5%, the content of the compound represented by formula II-3-a is 4%-10%, and the content of the compound represented by formula II-3-b is 4%-10%.

[0056] Further preferably, based on the total weight of the liquid crystal composition, the content of the compound shown in formula II-1-a is 3%-7%, the content of the compound shown in formula II-1-b is 4%-7%, the content of the compound shown in formula II-2-a is 1%-3%, the content of the compound shown in formula II-2-b is 1%-3%, the content of the compound shown in formula II-2-c is 1%-3%, the content of the compound shown in formula II-3-a is 4%-10%, and the content of the compound shown in formula II-3-b is 4%-10%.

[0057] Component three of the present invention is at least one selected from the group consisting of compounds represented by formula III-1, formula III-2, formula III-3, formula III-4, and formula III-5, wherein R 3 , R 5 , R6 , R 8 , R 9 Each independently represents an alkyl group having 2 to 7 carbon atoms. 3 , R 5 , R 6 , R 8 , R 9 The alkyl groups may be the same or different. The alkyl group may be a straight chain alkyl group or a branched chain alkyl group. The number of carbon atoms in the alkyl group is 2-7, for example, 2, 3, 4, 5, 6, or 7.

[0058] .

[0059] Exemplarily, component three can be selected from C 2 H 5 -Ph-Ph-Ph-CN, C 3 H 7 -Ph-Ph-Ph-CN, C 4 H 9 -Ph-Ph-Ph-CN, C 5 H 11 -Ph-Ph-Ph-CN, C 6 H 13 -Ph-Ph-Ph-CN, C 7 H 15 -Ph-Ph-Ph-CN, C 3 H 7 -Ph-Ph(3F)-Ph-CN、C 4 H 9 -Ph-Ph(3F)-Ph-CN、C 5 H 11 -Ph-Ph(3F)-Ph-CN、C 6 H 13 -Ph-Ph(3F)-Ph-CN、C 7 H 15 -Ph-Ph(3F)-Ph-CN, CN-Ph-Ph(3F)-Ph-C 3 H 7 、CN-Ph-Ph(3F)-Ph-C 4 H 9 、CN-Ph-Ph(3F)-Ph-C 5 H 11 、CN-Ph-Ph(3F)-Ph-C 6 H 13 、CN-Ph-Ph(3F)-Ph-C 7 H 15 , C 3 H 7-Ph-Ph-Ph(3F)-CN、C 4 H 9 -Ph-Ph-Ph(3F)-CN、C 5 H 11 -Ph-Ph-Ph(3F)-CN、C 6 H 13 -Ph-Ph-Ph(3F)-CN、C 7 H 15 -Ph-Ph-Ph(3F)-CN、C 3 H 7 -Ph-Ph(3F)-Ph(3F)-CN、C 5 H 11 -Ph-Ph(3F)-Ph(3F)-CN、C 7 H 15 -Ph-Ph(3F)-Ph(3F)-CN, etc.

[0060] In some preferred embodiments of the present invention, in the component three, the compound represented by the general formula III-1 is selected from the compound represented by the formula III-1-a and / or the compound represented by the formula III-1-b, the compound represented by the general formula III-2 is selected from the compound represented by the formula III-2-a and / or the compound represented by the formula III-2-b, the compound represented by the general formula III-3 is selected from the compound represented by the formula III-3-a and / or the compound represented by the formula III-3-b, the compound represented by the general formula III-4 is selected from the compound represented by the formula III-4-a and / or the compound represented by the formula III-4-b, and the compound represented by the general formula III-5 is selected from the compound represented by the formula III-5-a and / or the compound represented by the formula III-5-b. Among them, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by Formula III-1-a, Formula III-1-b, Formula III-2-a, Formula III-2-b, Formula III-3-a, Formula III-3-b, Formula III-4-a, Formula III-4-b, Formula III-5-a, and Formula III-5-b is 3%-22%, preferably 5%-20%.

[0061] The general formulas are as follows: .

[0062] More preferably, based on the total weight of the liquid crystal composition, the content of the compound shown in formula III-1-a is 0-1%, the content of the compound shown in formula III-1-b is 0-3%, the content of the compound shown in formula III-2-a is 0-3%, the content of the compound shown in formula III-2-b is 0-1%, the content of the compound shown in formula III-3-a is 0-4%, the content of the compound shown in formula III-3-b is 0-4%, the content of the compound shown in formula III-4-a is 0-2%, the content of the compound shown in formula III-4-b is 0-3%, the content of the compound shown in formula III-5-a is 0-4%, and the content of the compound shown in formula III-5-b is 0-5%.

[0063] In some specific embodiments, based on the total weight of the liquid crystal composition, the content of the compound represented by formula III-1-a is 0.5-1%, the content of the compound represented by formula III-1-b is 1-3%, the content of the compound represented by formula III-2-a is 1-3%, the content of the compound represented by formula III-2-b is 0.5-1%, the content of the compound represented by formula III-3-a is 2-4%, the content of the compound represented by formula III-3-b is 2-4%, the content of the compound represented by formula III-4-a is 1-2%, the content of the compound represented by formula III-4-b is 1-3%, the content of the compound represented by formula III-5-a is 1-4%, and the content of the compound represented by formula III-5-b is 1-5%. This preferred solution is more conducive to improving the comprehensive effects of high contrast, fast response speed, and good high and low temperature tolerance.

[0064] Component 4 of the present invention is at least one selected from the group consisting of compounds represented by general formula IV-1, general formula IV-2, and general formula IV-3, wherein X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 Each independently represents hydrogen or fluorine, R 0 represents an alkyl group having 1 to 12 carbon atoms, and one or more hydrogen atoms in the alkyl group may be independently substituted by fluorine atoms, and P1 and P2 each independently represent 4, 5, 6, 7 or 8. X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9, X 10 , X 11 The groups may be the same or different and may be hydrogen or fluorine. 0 One or more hydrogen atoms in the alkyl group may be independently substituted by fluorine atoms, which means that any hydrogen atom on the alkyl group may be substituted by fluorine atoms, or may not be substituted (all are carbon alkyl groups), or some hydrogen atoms may be substituted by fluorine atoms.

[0065] .

[0066] Exemplarily, component four can be selected from CF 3 -C 4 H 8 -PhPh-C 6 H 12 -CF 3 CF 3 -C 4 H 8 -PhPh-C 4 H 8 -CF 3 CF 3 -C 6 H 12 -PhPh-C 4 H 8 -CF 3 CF 3 -C 6 H 12 -PhPh-C 6 H 12 -CF 3 CF 3 -C 8 H 16 -PhPh-C 7 H 14 -CF 3 CF 3 -C 4 H 8 -Ph(2F)-Ph-C 6 H 12 -CF 3 CF 3 -C 4 H 8 -Ph-Ph(3F)-C 6 H 12 -CF 3 CF 3 -C 4 H 8 -Ph(2F6F)-Ph-C 6 H 12 -CF 3 CF 3 -C4 H 8 -Ph-Ph(6F)-C 6 H 12 -CF 3 、C 5 H 11 -Ph(2F)-CF 2 -CF 2 -Ph(3F)-C 5 H 11 、C 8 H 17 -Ph(6F)-CF 2 -CF 2 -Ph(6F)-C 5 H 11 、C 3 H 7 -Ph-CF 2 -CF 2 -Ph-C 5 H 11 、F-C 3 H 6 -Ph-CF 2 -CF 2 -Ph-C 5 H 10 -F、C 5 H 11 -Ph-Ph(3F)-Ph(3F5F)-CF 2 -O-Ph(3F5F)-F、C 5 H 11 -Ph(3F)-Ph(3F)-Ph(3F5F)-CF 2 -O-Ph(3F5F)-F、C 5 H 11 -Ph(5F)-Ph(3F)-Ph(3F5F)-CF 2 -O-Ph(3F5F)-F、F-C 5 H 10 -Ph(5F)-Ph(3F)-Ph(3F5F)-CF 2 -O-Ph(3F5F)-F、CH 3 -CH(F)-C 5 H 10 -Ph-Ph(3F5F)-Ph(3F5F)-CF 2 At least one of -O-Ph(3F5F)-F, etc.

[0067] More preferably, the component 4 comprises at least one of the compounds of formula IV-1, and the total content of the compounds of formula IV-1 is 1%-15% based on the total weight of the liquid crystal composition. In this preferred embodiment, the liquid crystal composition comprises a suitable proportion of the compounds of formula IV-1, which is more conducive to achieving high contrast, fast response, and wide temperature range stability due to the synergistic effect of the rigid fluorinated aromatic core and the flexible perfluoroalkyl side chain.

[0068] Preferably, the component 4 comprises at least one of the compounds of general formula IV-3, and the total content of the compounds of general formula IV-3 is 1%-20% based on the total weight of the liquid crystal composition. In this preferred embodiment, the liquid crystal composition comprises a suitable proportion of the compounds of general formula IV-3, which can reduce the viscosity through ether bonds and perfluoroalkyl side chains on the basis of the synergistic effect of the rigid fluorinated aromatic core and the flexible perfluoroalkyl side chain, which is more conducive to the optimization of optical properties, the improvement of response speed, the enhancement of high and low temperature tolerance, and the improvement of compatibility and stability.

[0069] Preferably, the liquid crystal composition further comprises component five, which is selected from at least one of the compounds represented by formula V-1, formula V-2, formula V-3 and formula V-4, wherein R 10 , R 12 , R 13 , R 14 Each independently represents an alkyl group having 2 to 7 carbon atoms, R 11 represents an alkoxy group having 1 to 2 carbon atoms or an alkyl group having 2 to 7 carbon atoms, L 1 , L 2 Each independently represents H or F, and each independently represents cyclohexane or a benzene ring. 10 , R 12 , R 13 , R 14 The alkyl groups of R may be the same or different, and may be straight-chain or branched. 11 When it is an alkyl group, it can be a straight chain alkyl group or a branched chain alkyl group. Ring B and Ring C can be the same or different. 1 , L 2 Can be the same or different.

[0070] .

[0071] Among them, the terminal C in the compounds represented by general formula V-1, general formula V-2, and general formula V-4 3 H 7 The - group may be straight chain or branched.

[0072] Exemplarily, component five can be selected from C 3 H 7-Ch-COO-Ph-Ch-C 3 H 7 , C 6 H 13 -Ch-COO-Ph-Ch-C 3 H 7 , C 3 H 7 -Ph-COO-Ph-Ch-C 3 H 7 , C 6 H 13 -Ph-COO-Ph-Ch-C 3 H 7 , CH 3 O-Ph-COO-Ph-Ch-C 3 H 7 , CH 3 CH 2 O-Ph-COO-Ph-Ch-C 3 H 7 , C 5 H 11 -Ch-Ph-Ph(3F)-Ph-C 5 H 11 , C 6 H 13 -Ch-Ph-Ph-Ph-C 6 H 13 , C 5 H 11 -Ch-Ph-Ph(2F3F)-Ch-C 5 H 11 , C 5 H 11 -Ch-Ch-COO-Ph-Ch-C 3 H 7 , C 5 H 11 -Ch-Ch-COO-Ch-Ch-C 3 H 7 , C 3 H 7 -Ch-Ch-COO-Ch-Ch-C 3 H 7 At least one of the above.

[0073] In the preferred embodiment of the present invention containing component five, component five cooperates with other components and can cooperate with the polycyclic compound through ester bonds to enhance the orderliness of molecular orientation and reduce light scattering. The flexible chain of component five itself is also conducive to reducing viscosity, thereby being more conducive to high contrast and rapid response.

[0074] Preferably, the content of component five in the liquid crystal composition is 5%-15%.

[0075] Further preferably, R in the component 5 11 represents methoxy, ethoxy, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl or n-heptyl. In this preferred embodiment, R 11 It is possible to utilize alkyl chains (such as n-pentyl and n-hexyl) to form a dynamic equilibrium with polyfluorinated compounds and inhibit phase separation. Polar groups such as methoxy and ethoxy groups enhance the polarity of the molecule. In addition, long-chain alkyl groups (such as n-heptyl) enhance the flexibility and low-temperature fluidity of the molecule, ensuring stable low-temperature performance, and being more conducive to achieving high contrast, fast response, wide temperature range stability, and environmental tolerance.

[0076] The liquid crystal composition of the present invention can simultaneously achieve the comprehensive effects of high contrast, fast response speed, and good high and low temperature tolerance.

[0077] In a second aspect, the present invention further provides a device comprising the liquid crystal composition described in the first aspect.

[0078] In some preferred embodiments of the present invention, the element is a dimming device, and further an electrically controlled dimming device. The liquid crystal composition of the present invention can be used in any electrically controlled dimming device in the prior art.

[0079] The dimming device may include at least one of a display device, a dimming window, a smart window, etc. The dimming window may be, for example, a car dimming window, an electronic curtain, etc., and is particularly suitable for car dimming windows that are often used in extremely cold or hot scenes.

[0080] The following detailed description of the examples of the present invention is illustrative and is only used to explain the present invention, and should not be construed as limiting the present invention. Wherein, unless otherwise specified or otherwise specified, alkyl refers to straight-chain alkyl.

[0081] Example 1 A liquid crystal composition, the components and contents of which are shown in Table 2.

[0082] The obtained liquid crystal composition was subjected to various performance tests, and the test results are shown in Table 3. The test method is as follows: The transition temperature from the liquid crystal phase to the isotropic phase of the liquid crystal composition is denoted by Tni, and the testing instrument is a melting point meter.

[0083] The refractive index anisotropy of the liquid crystal composition is represented by Δn. The testing instrument is an Abbe refractometer, and the wavelength of the testing yellow light is 589 nm.

[0084] The high and low temperature cycle shock test method is as follows: take 1 gram of the liquid crystal composition and place it in a sealed tube, and seal it in a high and low temperature test box, cool it to -40°C, and maintain it at -40°C for 4 hours, then heat it to 110°C, and maintain it at 110°C for 4 hours, and then cycle the above low and high temperature control process 200 times.

[0085] Power consumption test: The liquid crystal composition was injected into the gap between the ITO sheet and the PET sheet (both of which had a size of 10 cm × 10 cm). The thickness of the liquid crystal composition layer was controlled to be 22 μm through the gap. A 20 V voltage was applied to test the power consumption and response time. The test instrument was a stopwatch.

[0086] Contrast test: The thickness of the liquid crystal composition layer is controlled to be 22 μm by spacing, and a voltage of 20 V is applied to measure the transmittance of the liquid crystal composition in the powered (transmitted state) and powered (dark state) states. The test instrument is a spectrophotometer.

[0087] Example 2-Example 6 The above test results are shown in Table 3. The above test results are shown in Table 3.

[0088] Table 2 (wherein the content is the percentage based on the total weight of the liquid crystal composition)

[0089] Example 7 Refer to Example 1, except that the sum of the contents of the compounds represented by Formula Ia, Formula Ib, Formula Ic, Formula Id, and Formula Ie in Component 1 remains unchanged, but the content of the compound represented by Formula Id and the content of the compound represented by Formula Ic are swapped, that is, the content of the compound represented by Formula Id is 5%, and the content of the compound represented by Formula Ic is 19%; in the liquid crystal composition of this scheme, the total weight content of F is 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.1.

[0090] And carry out corresponding performance test, the test results are shown in Table 3.

[0091] Example 8 Refer to Example 1, except that component one does not contain the compound represented by formula Ie, and the content of the compound represented by formula Id is 28% to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 4.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.3.

[0092] And carry out corresponding performance test, the test results are shown in Table 3.

[0093] Example 9 Refer to Example 1, except that component one does not contain the compound represented by formula Ia, and the content of the compound represented by formula Id is 24% to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 4.1%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.2.

[0094] And carry out corresponding performance test, the test results are shown in Table 3.

[0095] Example 10 Refer to Example 1, except that component one does not contain the compounds represented by Formula Ia, Formula Ib, Formula Ic, and Formula Ie, and component one only contains the compound represented by Formula Id and the content is 43% to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 4.3%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.5.

[0096] And carry out corresponding performance test, the test results are shown in Table 3.

[0097] Embodiment 11 The method is carried out in accordance with Example 1, except that in the compound represented by Formula Id in Component 1, C 5 H 11 - is a branched alkyl group, not the straight chain alkyl group of Example 1, C 5 H 11 -Specifically isopentyl.

[0098] And carry out corresponding performance test, the test results are shown in Table 3.

[0099] Example 12 Refer to Example 1, except that component 2 does not contain the compound of formula II-2 (the compound of formula II-2-a, the compound of formula II-2-b and the compound of formula II-2-c), and is equally supplemented to 100% by the compound of formula II-3-a and the compound of formula II-3-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.5%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.8.

[0100] And carry out corresponding performance test, the test results are shown in Table 3.

[0101] Embodiment 13 Refer to Example 1, except that component 2 does not contain the compound of general formula II-1 (the compound of formula II-1-a and the compound of formula II-1-b), and is equally supplemented to 100% by the compound of formula II-3-a and the compound of formula II-3-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.4%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.7.

[0102] And carry out corresponding performance test, the test results are shown in Table 3.

[0103] Embodiment 14 Refer to Example 1, except that component 2 does not contain the compound of formula II-3 (the compound of formula II-3-a and the compound of formula II-3-b), and is equally supplemented to 100% by the compound of formula II-1-a and the compound of formula II-1-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.5.

[0104] And carry out corresponding performance test, the test results are shown in Table 3.

[0105] Embodiment 15 Refer to Example 1, except that component 2 does not contain the compound represented by formula II-3-b, and is supplemented 100% by the compound represented by formula II-2-a; in the liquid crystal composition of this scheme, the total weight content of F is 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.5.

[0106] And carry out corresponding performance test, the test results are shown in Table 3.

[0107] Example 16 The method is carried out in accordance with Example 1, except that C in the compound represented by formula II-3-b in component 2 5 H 11 - is a branched alkyl group, not the straight chain alkyl group of Example 1, C 5 H 11 -Specifically isopentyl.

[0108] And carry out corresponding performance test, the test results are shown in Table 3.

[0109] Embodiment 17 Refer to Example 1, except that component three does not contain the compound of formula III-1 (the compound of formula III-1-a and the compound of formula III-1-b), and is supplemented 100% by the compound of formula III-5-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.5.

[0110] And carry out corresponding performance test, the test results are shown in Table 3.

[0111] Embodiment 18 Refer to Example 1, except that component three does not contain the compound of formula III-2 (including the compound of formula III-2-a and the compound of formula III-2-b and other compounds conforming to the general formula), and is supplemented 100% by the compound of formula III-5-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.3%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.4.

[0112] And carry out corresponding performance test, the test results are shown in Table 3.

[0113] Embodiment 19 Refer to Example 1, except that component three does not contain the compound of formula III-3 (the compound of formula III-3-a and the compound of formula III-3-b), and is supplemented 100% by the compound of formula III-5-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.5.

[0114] And carry out corresponding performance test, the test results are shown in Table 3.

[0115] Embodiment 20 Refer to Example 1, except that component three does not contain the compound of formula III-4 (the compound of formula III-4-a and the compound of formula III-4-b), and is supplemented 100% by the compound of formula III-5-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.1%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.6.

[0116] And carry out corresponding performance test, the test results are shown in Table 3.

[0117] Embodiment 21 Refer to Example 1, except that component three does not contain the compound of formula III-5 (the compound of formula III-5-a and the compound of formula III-5-b), and is supplemented 100% by the compound of formula III-1-b; in the liquid crystal composition of this scheme, the total weight content of F is 4.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.8.

[0118] And carry out corresponding performance test, the test results are shown in Table 3.

[0119] Embodiment 22 Refer to Example 1, except that component three does not contain the compound represented by formula III-5-b), and is supplemented by 100% of the compound represented by formula III-5-a; in the liquid crystal composition of this scheme, the total weight content of F is 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.6.

[0120] And carry out corresponding performance test, the test results are shown in Table 3.

[0121] Embodiment 23 The method is carried out in accordance with Example 1, except that component 3 does not contain C 4 H 9 -Ph-Ph(3F)-Ph-CN (general formula III-2), and supplemented by the compound represented by formula III-2-b to 100%; in the liquid crystal composition of this scheme, the total weight content of F is 4.5%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.3.

[0122] And carry out corresponding performance test, the test results are shown in Table 3.

[0123] Embodiment 24 The method is carried out in accordance with Example 1, except that the substituent of the compound represented by the general formula IV-1 of component 4 is changed, specifically CF 3 -C 8 H 16 -Ph(2F)-Ph(2F)-C 5 H 10 -CF 3 (i.e. P1 and P2 are 8 and 5 respectively, X 1 , X 2 , X 3 , X 4 The middle part is F), and the content remains unchanged; in the liquid crystal composition of this scheme, the total weight content of F is 4.5%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.1.

[0124] And carry out corresponding performance test, the test results are shown in Table 3.

[0125] Embodiment 25 The method is carried out in accordance with Example 1, except that in component 4, a compound represented by the general formula IV-2 (wherein R 0 All are n-propyl, X 5 , X 6 , X 7 , X 8 The compounds of the general formula IV-1 in Example 1 are replaced by H) with the content unchanged. In the liquid crystal composition of this scheme, the total weight content of F is 3.8%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.5.

[0126] And carry out corresponding performance test, the test results are shown in Table 3.

[0127] Embodiment 26 The method is carried out in accordance with Example 1, except that in component 4, a compound represented by the general formula IV-2 (wherein R 0 All are F-CH 2 CH 2 CH 2 -, X 5 , X 6 , X 7 , X 8 The compounds of formula IV-1 in Example 1 are replaced by F) with the content unchanged. In the liquid crystal composition of this scheme, the total weight content of F is 4.6%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.3.

[0128] And carry out corresponding performance test, the test results are shown in Table 3.

[0129] Embodiment 27 The method is carried out in accordance with Example 1, except that the structure of the compound of formula IV-3 in component 4 is different, specifically FC 5 H 10 -Ph(3F5F)-Ph(3F)-Ph(3F5F)-CF 2 -O-Ph(3F5F)-F, the content remains unchanged. In the liquid crystal composition of this scheme, the total weight content of F is 4.7%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.2.

[0130] And carry out corresponding performance test, the test results are shown in Table 3.

[0131] Embodiment 28 The method is carried out with reference to Example 1, except that the structure of the compound of formula V-3 in component five is different, and ring B in the compound of formula V-3 in Example 1 is replaced by cyclohexane, and the content remains unchanged; in the liquid crystal composition of this scheme, the total weight content of F is 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:2.6.

[0132] And carry out corresponding performance test, the test results are shown in Table 3.

[0133] Embodiment 29 Refer to Example 1, except that component five, i.e., compounds represented by formula V-1, V-2, V-3, and V-4, are not included, and the total amount is supplemented by the compound represented by formula Id to make up 100%; in the liquid crystal composition of this scheme, the total weight content of F is 4.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.6.

[0134] And carry out corresponding performance test, the test results are shown in Table 3.

[0135] Comparative Example 1 The method is carried out with reference to Example 1, except that component 4 (i.e., compounds represented by general formula IV-1, general formula IV-2, and general formula IV-3) and component 5 (i.e., compounds represented by general formula V-1, general formula V-2, general formula V-3, and general formula V-4) are not contained, and the content of component 1 is adjusted to make up the total amount of 100%. In the liquid crystal composition of this scheme, the total weight content of F is 3.5%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.2.

[0136] And carry out corresponding performance test, the test results are shown in Table 3.

[0137] Comparative Example 2 Refer to Example 1, except that component four (i.e., compounds represented by formula IV-1, formula IV-2, and formula IV-3) is not included, and the content of component one is adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 3.8%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.0.

[0138] And carry out corresponding performance test, the test results are shown in Table 3.

[0139] Comparative Example 3 Refer to Example 1, except that component three (i.e., compounds represented by formula III-1, formula III-2, formula III-3, formula III-4, and formula III-5) and component five (i.e., compounds represented by formula V-1, formula V-2, formula V-3, and formula V-4) are not included, and the content of component one is adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 3.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.5.

[0140] And carry out corresponding performance test, the test results are shown in Table 3.

[0141] Comparative Example 4 Refer to Example 1, except that component three (i.e., compounds represented by formula III-1, formula III-2, formula III-3, formula III-4, and formula III-5) is not included, and the content of component one is adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 3.6%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.1.

[0142] And carry out corresponding performance test, the test results are shown in Table 3.

[0143] Comparative Example 5 Refer to Example 1, except that component two (i.e., compounds represented by formula II-1, II-2, and II-3) and component five (i.e., compounds represented by formula V-1, V-2, V-3, and V-4) are not included, and the content of component one is adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 3.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.8.

[0144] And carry out corresponding performance test, the test results are shown in Table 3.

[0145] Comparative Example 6 Refer to Example 1, except that component 2 (i.e., compounds represented by formula II-1, formula II-2, and formula II-3) is not included, and the content of component 1 is adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F is 3.4%, and the weight ratio of the total amount of F to the total amount of aromatic groups is 1:3.3.

[0146] And carry out corresponding performance test, the test results are shown in Table 3.

[0147] Comparative Example 7 The method is carried out in accordance with Example 1, except that the structure of F in the compound represented by formula II-3-b in component 2 is different, specifically C 5 H11 -Ch-Ph(3F)-Ph-CN, the content of the compound remains unchanged.

[0148] And carry out corresponding performance test, the test results are shown in Table 3.

[0149] Comparative Example 8 The method is carried out in accordance with Example 1, except that the structure of F in the compound represented by formula III-5-a in component 3 is different, specifically C 3 H 7 -Ph(3F)-Ph(3F)-Ph-CN, the content of the compound remains unchanged.

[0150] And carry out corresponding performance test, the test results are shown in Table 3.

[0151] Comparative Example 9 The method is carried out in accordance with Example 1, except that the number of P1 and P2 in the general formula IV-1 in component 4 is different and both are 1, specifically CF 3 -CH 2 -PhPh-CH 2 -CF 3 , the content of the compound remains unchanged.

[0152] And carry out corresponding performance test, the test results are shown in Table 3.

[0153] Table 3

[0154] It can be seen from the test data of the above embodiments and comparative examples that, compared with the comparative examples, the embodiment scheme provided by the present invention has a higher phase transition temperature, a faster response speed, and a high contrast ratio. After the high and low temperature impact test, the power consumption of the scheme of the present invention has no obvious increase, indicating that the scheme of the present invention has high long-term stability for both extremely low temperatures (-40°C) and high temperatures (110°C), has good tolerance to high and low temperatures, and is suitable for dimming devices used outdoors, especially for automotive dimming windows that are often used in extremely cold and hot scenes. However, the scheme of the comparative example cannot take into account the comprehensive effects of high contrast, fast response speed, and good tolerance to high and low temperatures.

[0155] It can be seen from the above-mentioned Example 1 and Examples 7-11 that the use of the preferred component 1 of the present invention is more conducive to improving the light modulation capability and driving efficiency and suppressing the risk of phase separation.

[0156] It can be seen from the above-mentioned Example 1 and Examples 12-16 that the preferred solution of component 2 of the present invention is more conducive to enhancing high temperature stability and intermolecular dipole effect, reducing viscosity and optimizing optical uniformity.

[0157] It can be seen from the above-mentioned Example 1 and Examples 17-23 that the use of the preferred component three solution of the present invention is more conducive to optimizing the molecular arrangement and contrast, and ensuring the response speed in a wide temperature range.

[0158] It can be seen from the above-mentioned Example 1 and Examples 24-27 that the use of the preferred component four of the present invention is more conducive to achieving the synergy of high contrast and fast response and enhancing high and low temperature compatibility.

[0159] It can be seen from the above-mentioned Example 1 and Examples 28-29 that the use of the preferred component five of the present invention is more conducive to reducing light scattering and improving contrast, and enhancing low-temperature fluidity and environmental tolerance.

[0160] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that: include: Component 1, which is selected from at least one of the compounds represented by general formula I, wherein R1 represents an alkyl group having 2 to 7 carbon atoms; Component 2, which is at least one selected from the group consisting of compounds represented by formula II-1, formula II-2, and formula II-3, wherein R2, R4, and R7 each independently represent an alkyl group having 2 to 5 carbon atoms; Component three, which is at least one selected from the group consisting of compounds represented by formula III-1, formula III-2, formula III-3, formula III-4, and formula III-5, wherein R3, R5, R6, R8, and R9 each independently represent an alkyl group having 2 to 7 carbon atoms; Component 4, which is selected from at least one of the compounds represented by formula IV-1, formula IV-2, and formula IV-3, wherein X1, X2, X3, X4, X5, X6, X7, X8, X9, X 10 , X 11 Each independently represents hydrogen or fluorine, R0 represents an alkyl group having 1 to 12 carbon atoms and one or more hydrogen atoms in the alkyl group can be independently substituted by fluorine, and P1 and P2 independently represent 4, 5, 6, 7 or 8; Wherein, based on the total weight of the liquid crystal composition, the content of component one is 5%-88%, the content of component two is 10%-50%, the content of component three is 1%-25%, and the content of component four is 1%-20%; The general formulas are as follows: 。 2. The liquid crystal composition according to claim 1, characterized in that: Based on the total weight of the liquid crystal composition, the total weight content of F is 2%-6%.

3. The liquid crystal composition according to claim 1, characterized in that: Based on the total weight of the liquid crystal composition, the weight ratio of the total amount of F contained to the total amount of aromatic groups contained is 1:(1-5).

4. The liquid crystal composition according to claim 1, characterized in that: Based on the total weight of the liquid crystal composition, the content of component 1 is 20%-55%.

5. The liquid crystal composition according to claim 1, characterized in that: The component 1 includes a compound represented by formula Id, and at least one selected from the group consisting of compounds represented by formula Ia, formula Ib, formula Ic, and formula Ie, wherein the sum of the contents of the compounds represented by formula Ia, formula Ib, formula Ic, formula Id, and formula Ie is 20%-50% based on the total weight of the liquid crystal composition; wherein the general formulas are as follows: 。 6. The liquid crystal composition according to claim 5, characterized in that: Based on the total weight of the liquid crystal composition, the content of the compound represented by formula Ia is 0-10%, the content of the compound represented by formula Ib is 0-10%, the content of the compound represented by formula Ic is 0-10%, the content of the compound represented by formula Id is 10%-20%, and the content of the compound represented by formula Ie is 0-10%.

7. The liquid crystal composition according to claim 1, characterized in that: In the component 2, the compound represented by the general formula II-1 is selected from the compound represented by the formula II-1-a and / or the compound represented by the formula II-1-b, the compound represented by the general formula II-2 is selected from the group consisting of the compound represented by the formula II-2-a, the compound represented by the formula II-2-b and the compound represented by the formula II-2-c, and the compound represented by the general formula II-3 is selected from the compound represented by the formula II-3-a and / or the compound represented by the formula II-3-b; wherein, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by the formula II-1-a, formula II-1-b, formula II-2-a, formula II-2-b, formula II-2-c, formula II-3-a, and formula II-3-b is 15%-45%; wherein, each general formula is as follows: 。 8. The liquid crystal composition according to claim 7, characterized in that: In the component two, based on the total weight of the liquid crystal composition, the content of the compound represented by formula II-1-a is 3%-7%, the content of the compound represented by formula II-1-b is 4%-7%, the content of the compound represented by formula II-2-a is 0-6%, the content of the compound represented by formula II-2-b is 0-6%, the content of the compound represented by formula II-2-c is 0-5%, the content of the compound represented by formula II-3-a is 4%-10%, and the content of the compound represented by formula II-3-b is 4%-10%.

9. The liquid crystal composition according to claim 1, characterized in that: In the component three, the compound represented by the general formula III-1 is selected from the compound represented by the formula III-1-a and / or the compound represented by the formula III-1-b, the compound represented by the general formula III-2 is selected from the compound represented by the formula III-2-a and / or the compound represented by the formula III-2-b, the compound represented by the general formula III-3 is selected from the compound represented by the formula III-3-a and / or the compound represented by the formula III-3-b, the compound represented by the general formula III-4 is selected from the compound represented by the formula III-4-a and / or the compound represented by the formula III-4-b, and the compound represented by the general formula III-5 is selected from the compound represented by the formula III-5-a and / or the compound represented by the formula III-5-b, wherein, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by the formula III-1-a, formula III-1-b, formula III-2-a, formula III-2-b, formula III-3-a, formula III-3-b, formula III-4-a, formula III-4-b, formula III-5-a, and formula III-5-b is 3%-22%; wherein, each general formula is as follows: 。 10. The liquid crystal composition according to claim 9, characterized in that: Based on the total weight of the liquid crystal composition, the content of the compound shown by formula III-1-a is 0-1%, the content of the compound shown by formula III-1-b is 0-3%, the content of the compound shown by formula III-2-a is 0-3%, the content of the compound shown by formula III-2-b is 0-1%, the content of the compound shown by formula III-3-a is 0-4%, the content of the compound shown by formula III-3-b is 0-4%, the content of the compound shown by formula III-4-a is 0-2%, the content of the compound shown by formula III-4-b is 0-3%, the content of the compound shown by formula III-5-a is 0-4%, and the content of the compound shown by formula III-5-b is 0-5%.

11. The liquid crystal composition according to claim 9, characterized in that: The component four comprises at least one of the compounds represented by the general formula IV-1, and the total content of the compounds represented by the general formula IV-1 is 1%-15% based on the total weight of the liquid crystal composition.

12. The liquid crystal composition according to claim 9, characterized in that: The component four contains at least one of the compounds represented by the general formula IV-3, and the total content of the compounds represented by the general formula IV-3 is 1%-20% based on the total weight of the liquid crystal composition.

13. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises a component five, which is selected from at least one of the compounds represented by the general formula V-1, the general formula V-2, the general formula V-3, and the general formula V-4, wherein R 10 , R 12 , R 13 , R 14 Each independently represents an alkyl group having 2 to 7 carbon atoms, R 11 represents an alkoxy group having 1 to 2 carbon atoms or an alkyl group having 2 to 7 carbon atoms, L1 and L2 each independently represent H or F, and ring B and ring C each independently represent cyclohexane or a benzene ring; the content of component five in the liquid crystal composition is 5%-15%; wherein the general formulas are as follows: 。 14. The liquid crystal composition according to claim 13, characterized in that: The R 11 represents a methoxy group, an ethoxy group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group or an n-heptyl group.

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

16. The element according to claim 15, characterized in that The component is an electrically controlled dimming device.

Images