A liquid crystal composition and its device

Abstract

The present invention belongs to the technical field of liquid crystal compositions, and particularly relates to a liquid crystal composition and its element. The liquid crystal composition includes: based on the total weight of the liquid crystal composition, the content of Component 1 is 5% - 88%, the content of Component 2 is 10% - 50%, the content of Component 3 is 1% - 25%, and the content of Component 4 is 1% - 20%. The liquid crystal composition of the present invention has the characteristics of high contrast ratio, fast 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 particularly relates to a liquid crystal composition and its element. Background Art

[0002] According to the similarities and differences in control means and principles, the dimming device can achieve the switching between the transparent and opaque states or between the high light transmittance state (transparent state) and the low light transmittance state (dark state) by various methods such as electro-control, temperature-control, light-control, and pressure-control. Electro-controlled liquid crystal is the most widely used method for realizing dimming in the dimming devices on the market at present. After being powered on, the liquid crystal molecules are arranged along with the electric field and present a transparent state to light. After being powered off, the liquid crystal molecules are naturally arranged and present an opaque state to light.

[0003] For the liquid crystal composition used in the electro-controlled dimming device, it is necessary to have a wide liquid crystal phase range, high light transmittance in the transparent state, and low light transmittance in the dark state, that is, good contrast characteristics. At the same time, taking into account a fast response speed is the goal that is constantly pursued. The dimming devices for outdoor applications are challenged by extremely cold and extremely 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 liquid crystal molecules in the existing liquid crystal compositions, it is usually impossible to simultaneously achieve good comprehensive effects of 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 defect that the existing liquid crystal composition cannot simultaneously achieve good contrast characteristics, fast response speed, and good high and low temperature tolerance, and 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] To achieve the above purpose, in the first aspect, the present invention provides a liquid crystal composition, comprising:

[0006] Component 1, which is selected from at least one of the compounds represented by General Formula I, wherein R1 represents an alkyl group with 2-7 carbon atoms;

[0007] Component 2, which is selected from at least one of the compounds represented by General Formula II-1, General Formula II-2, and General Formula II-3, wherein R2, R4, and R7 each independently represent an alkyl group with 2-5 carbon atoms;

[0008] Component 3, which is selected from at least one of the compounds represented by General Formula III-1, General Formula III-2, General Formula III-3, General Formula III-4, and General Formula III-5, wherein R3, R5, R6, R8, and R9 each independently represent an alkyl group with 2-7 carbon atoms;

[0009] Component Four, which is selected from at least one of the compounds represented by General Formula IV-1, General Formula IV-2, and General 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 hydrogens in the alkyl group may each independently be replaced by fluorine, and P1 and P2 each independently represent 4, 5, 6, 7, or 8.

[0010] Among them, 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%.

[0011] The general formulas are as follows:

[0012]

[0013]

[0014]

[0015] 。

[0016] 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%, preferably 3% - 5%.

[0017] 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.

[0018] In some preferred embodiments of the present invention, based on the total weight of the liquid crystal composition, the content of Component One is 20% - 55%.

[0019] In some preferred embodiments of the present invention, Component One includes the compound represented by Formula I-d and at least one selected from the group consisting of the compounds represented by Formula I-a, Formula I-b, Formula I-c, and Formula I-e. Among them, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by Formula I-a, Formula I-b, Formula I-c, Formula I-d, and Formula I-e is 20% - 50%.

[0020] Among them, the general formulas are as follows:

[0021] 。

[0022] More preferably, based on the total weight of the liquid crystal composition, the content of the compound represented by Formula I-a is 0-10%, the content of the compound represented by Formula I-b is 0-10%, the content of the compound represented by Formula I-c is 0-10%, the content of the compound represented by Formula I-d is 10%-20%, preferably 10%-15%, and the content of the compound represented by Formula I-e is 0-10%.

[0023] In some preferred embodiments of the present invention, in Component II, 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%.

[0024] Among them, the general formulas are as follows:

[0025] 。

[0026] More preferably, in Component II, 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%.

[0027] In some preferred embodiments of the present invention, in Component III, the compound represented by General Formula III-1 is selected from the compound represented by Formula III-1-a and / or the compound represented by Formula III-1-b, the compound represented by General Formula III-2 is selected from the compound represented by Formula III-2-a and / or the compound represented by Formula III-2-b, the compound represented by General Formula III-3 is selected from the compound represented by Formula III-3-a and / or the compound represented by Formula III-3-b, the compound represented by General Formula III-4 is selected from the compound represented by Formula III-4-a and / or the compound represented by Formula III-4-b, and the compound represented by General Formula III-5 is selected from the compound represented by Formula III-5-a and / or the compound represented by 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%.

[0028] Among them, the general formulas are as follows:

[0029] 。

[0030] More preferably, based on the total weight of the liquid crystal composition, the content of the compound represented by Formula III-1-a is 0 - 1%, the content of the compound represented by Formula III-1-b is 0 - 3%, the content of the compound represented by Formula III-2-a is 0 - 3%, the content of the compound represented by Formula III-2-b is 0 - 1%, the content of the compound represented by Formula III-3-a is 0 - 4%, the content of the compound represented by Formula III-3-b is 0 - 4%, the content of the compound represented by Formula III-4-a is 0 - 2%, the content of the compound represented by Formula III-4-b is 0 - 3%, the content of the compound represented by Formula III-5-a is 0 - 4%, and the content of the compound represented by Formula III-5-b is 0 - 5%.

[0031] More preferably, Component IV contains at least one of the compounds represented by General Formula IV-1, and based on the total weight of the liquid crystal composition, the total content of the compounds represented by General Formula IV-1 is 1% - 15%.

[0032] More preferably, Component IV contains at least one of the compounds represented by General Formula IV-3, and based on the total weight of the liquid crystal composition, the total content of the compounds represented by General Formula IV-3 is 1% - 20%.

[0033] In some preferred embodiments of the present invention, the liquid crystal composition further includes Component V, and Component V is selected from at least one of the group consisting of the compounds represented by General Formula V-1, General Formula V-2, General Formula V-3, and General Formula V-4, where R 10 、R12 , R 13 , R 14 Each independently represents an alkyl group having 2 to 7 carbon atoms, and 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%.

[0034] Among them, each general formula is as follows:

[0035] .

[0036] Further preferably, in component five, R 11 represents methoxy, ethoxy, ethyl, n - propyl, n - butyl, n - pentyl, n - hexyl or n - heptyl.

[0037] In a second aspect, the present invention also provides a component, which includes the liquid crystal composition described in the first aspect.

[0038] In some preferred embodiments of the present invention, the component is an electro - controlled dimming device.

[0039] The dimming device may include, for example, at least one of a display device, a dimming window, a smart window, etc.

[0040] Beneficial effects:

[0041] The inventors of the present invention have found through research that fluorine atoms have the largest electronegativity and strong electron - binding ability. The electron cloud distribution of the C - F bond is not easily affected. Therefore, polyfluorinated compounds have small intermolecular forces. This characteristic can weaken the performance changes caused by changes in intermolecular forces, especially in the case of high - low temperature changes. Moreover, due to many characteristics of polyfluorinated compounds, such as a unique "fluorocarbon phase" and large intermolecular voids, etc., polyfluorinated compounds can be used to affect the high - low temperature stability of liquid crystal compositions. However, the relationship between the structure of polyfluorinated compounds and the high - low temperature stability of liquid crystal compositions is not yet clear. Therefore, it is still necessary to further study the types of polyfluorinated compounds, the types of components of liquid crystal compositions, and their feasible ratios. Based on this, the present invention is further proposed.

[0042] 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.

[0043] 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

[0044] 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).

[0045] 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.

[0046] 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%.

[0047] 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, it can be 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 ranges between any two of these point values, and more preferably 3% - 5%. Adopting the preferred solution of the present invention is more conducive to balancing the polar and non-polar interactions of the liquid crystal composition.

[0048] 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 ranges between any two of these point values, and more preferably 1:(2 - 4). In this preferred solution, 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 interactions and compatibility, and is more conducive to improving the high and low temperature stability, response speed and optical properties of the liquid crystal composition.

[0049] In the present invention, the aromatic group includes a substituted or unsubstituted phenyl group.

[0050] Component 1 of the present invention is selected from at least one of the compounds represented by General Formula I, wherein R1 represents an alkyl group having 2 - 7 carbon atoms. The number of carbon atoms in R1 is 2 - 7, for example, it can be 2, 3, 4, 5, 6, 7. The alkyl group can be a straight-chain alkyl group or a branched-chain alkyl group. For example, when the number of carbon atoms is 4, R1 can represent CH3-CH2-CH2-CH2-, -CH2CH2CH2CH3, -CH(CH3)CH2CH3, -CH2CH(CH3)2 or -C(CH3)3.

[0051] In the present invention, the short-form codes corresponding to some structural formulas are shown in Table 1 below.

[0052] Table 1

[0053]

[0054] Exemplarily, Component 1 can be selected from at least one of C2H5-Ph-Ph-CN, C3H7-Ph-Ph-CN, C4H9-Ph-Ph-CN, C5H 11 -Ph-Ph-CN, C6H 13 -Ph-Ph-CN, C7H 15 -Ph-Ph-CN.

[0055] In some preferred embodiments of the present invention, based on the total weight of the liquid crystal composition, the content of Component 1 is 20% - 55%.

[0056] In some preferred embodiments of the present invention, Component 1 includes the compound shown in Formula I-d, and at least one selected from the group consisting of the compounds shown in Formula I-a, Formula I-b, Formula I-c, and Formula I-e. It can be understood that Component 1 includes the compound shown in Formula I-d and other compounds, and the other compounds are at least one selected from the group consisting of the compounds shown in Formula I-a, Formula I-b, Formula I-c, and Formula I-e.

[0057] Among them, the general formulas are as follows:

[0058] .

[0059] Preferably, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds shown in Formula I-a, Formula I-b, Formula I-c, Formula I-d, and Formula I-e is 20% - 50%. Under this preferred scheme, the ratio is appropriate, and since it can significantly improve the light modulation ability and driving efficiency of the liquid crystal composition, it is more conducive to achieving high contrast and fast response.

[0060] More preferably, based on the total weight of the liquid crystal composition, the content of the compound shown in Formula I-a is 0% - 10%, the content of the compound shown in Formula I-b is 0% - 10%, the content of the compound shown in Formula I-c is 0% - 10%, the content of the compound shown in Formula I-d is 10% - 20%, and the content of the compound shown in Formula I-e is 0% - 10%.

[0061] Further preferably, based on the total weight of the liquid crystal composition, the content of the compound shown in Formula I-a is 5% - 10%, the content of the compound shown in Formula I-b is 6% - 8%, the content of the compound shown in Formula I-c is 0% - 8%, the content of the compound shown in Formula I-d is 10% - 14%, and the content of the compound shown in Formula I-e is 5% - 9%. Under this preferred scheme, the proportions of the compounds are appropriate, which is more conducive to optimizing the arrangement of liquid crystal molecules.

[0062] Component two of the present invention is selected from at least one of the compounds represented by General Formula II-1, General Formula II-2, and General Formula II-3, wherein R2, R4, and R7 each independently represent an alkyl group having 2 to 5 carbon atoms. The alkyl groups of R2, R4, and R7 may be the same or different, and the alkyl may be a straight-chain alkyl or a branched-chain alkyl. The number of carbon atoms in the alkyl is 2 to 5, for example, it may be 2, 3, 4, or 5.

[0063] 。

[0064] Exemplarily, component two may be selected from at least one of C2H5-Ch-Ph-Ph-CN, C3H7-Ch-Ph-Ph-CN, C4H9-Ch-Ph-Ph-CN, C5H 11 -Ch-Ph-Ph-CN, C2H5-Ch-COO-Ph-Ph-CN, C3H7-Ch-COO-Ph-Ph-CN, C4H9-Ch-COO-Ph-Ph-CN, C5H 11 -Ch-COO-Ph-Ph-CN, C2H5-Ch-Ph-Ph(3F)-CN, C3H7-Ch-Ph-Ph(3F)-CN, C4H9-Ch-Ph-Ph(3F)-CN, C5H 11 -Ch-Ph-Ph(3F)-CN.

[0065] 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%.

[0066] The general formulas are as follows:

[0067] 。

[0068] Preferably, in Component II, 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%.

[0069] More preferably, 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 1% - 3%, the content of the compound represented by Formula II-2-b is 1% - 3%, the content of the compound represented by Formula II-2-c is 1% - 3%, 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%.

[0070] Component III of the present invention is selected from at least one of the compounds represented by General Formula III-1, General Formula III-2, General Formula III-3, General Formula III-4, and General Formula III-5, wherein R3, R5, R6, R8, and R9 each independently represent an alkyl group having 2 - 7 carbon atoms. The alkyl groups of R3, R5, R6, R8, and R9 can be the same or different, and the alkyl can be a straight-chain alkyl or a branched-chain alkyl. The number of carbon atoms of the alkyl is 2 - 7, for example, it can be 2, 3, 4, 5, 6, or 7.

[0071] 。

[0072] Exemplarily, Component III can be selected from C2H5-Ph-Ph-Ph-CN, C3H7-Ph-Ph-Ph-CN, C4H9-Ph-Ph-Ph-CN, C5H 11 -Ph-Ph-Ph-CN, C6H 13 -Ph-Ph-Ph-CN, C7H 15 -Ph-Ph-Ph-CN, C3H7-Ph-Ph(3F)-Ph-CN, C4H9-Ph-Ph(3F)-Ph-CN, C5H 11 -Ph-Ph(3F)-Ph-CN, C6H 13 -Ph-Ph(3F)-Ph-CN, C7H 15 -Ph-Ph(3F)-Ph-CN, CN-Ph-Ph(3F)-Ph-C3H7, CN-Ph-Ph(3F)-Ph-C4H9, CN-Ph-Ph(3F)-Ph-C5H11 , CN-Ph-Ph(3F)-Ph-C6H 13 , CN-Ph-Ph(3F)-Ph-C7H 15 , C3H7-Ph-Ph-Ph(3F)-CN, C4H9-Ph-Ph-Ph(3F)-CN, C5H 11 -Ph-Ph-Ph(3F)-CN, C6H 13 -Ph-Ph-Ph(3F)-CN, C7H 15 -Ph-Ph-Ph(3F)-CN, C3H7-Ph-Ph(3F)-Ph(3F)-CN, C5H 11 -Ph-Ph(3F)-Ph(3F)-CN, C7H 15 -Ph-Ph(3F)-Ph(3F)-CN and the like.

[0073] In some preferred embodiments of the present invention, in Component III, the compound represented by General Formula III-1 is selected from the compound represented by Formula III-1-a and / or the compound represented by Formula III-1-b, the compound represented by General Formula III-2 is selected from the compound represented by Formula III-2-a and / or the compound represented by Formula III-2-b, the compound represented by General Formula III-3 is selected from the compound represented by Formula III-3-a and / or the compound represented by Formula III-3-b, the compound represented by General Formula III-4 is selected from the compound represented by Formula III-4-a and / or the compound represented by Formula III-4-b, and the compound represented by General Formula III-5 is selected from the compound represented by Formula III-5-a and / or the compound represented by 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%.

[0074] The general formulas are as follows:

[0075] .

[0076] More preferably, based on the total weight of the liquid crystal composition, the content of the compound represented by Formula III-1-a is 0-1%, the content of the compound represented by Formula III-1-b is 0-3%, the content of the compound represented by Formula III-2-a is 0-3%, the content of the compound represented by Formula III-2-b is 0-1%, the content of the compound represented by Formula III-3-a is 0-4%, the content of the compound represented by Formula III-3-b is 0-4%, the content of the compound represented by Formula III-4-a is 0-2%, the content of the compound represented by Formula III-4-b is 0-3%, the content of the compound represented by Formula III-5-a is 0-4%, and the content of the compound represented by Formula III-5-b is 0-5%.

[0077] 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 scheme is more conducive to enhancing the comprehensive effects of high contrast, fast response speed, and good high and low temperature tolerance.

[0078] Component Four of the present invention is selected from at least one of the compounds represented by General Formula IV-1, General Formula IV-2, and General 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 1-12 carbon atoms and one or more hydrogens in the alkyl group may each independently be substituted by fluorine, and P1, P2 each independently represent 4, 5, 6, 7, or 8. The groups of X1, X2, X3, X4, X5, X6, X7, X8, X9, X 10 、X 11 may be the same or different and may each be hydrogen or fluorine. One or more hydrogens in the alkyl group of R0 may each independently be substituted by fluorine, which means that any hydrogen on the alkyl group may be substituted by fluorine, or not substituted (all are carbon alkyl groups), or some hydrogens are substituted by fluorine.

[0079] 。

[0080] Exemplarily, Component Four may be selected from CF3-C4H8-PhPh-C6H 12-CF3, CF3-C4H8-PhPh-C4H8-CF3, CF3-C6H 12 -PhPh-C4H8-CF3, CF3-C6H 12 -PhPh-C6H 12 -CF3, CF3-C8H 16 -PhPh-C7H 14 -CF3, CF3-C4H8-Ph(2F)-Ph-C6H 12 -CF3, CF3-C4H8-Ph-Ph(3F)-C6H 12 -CF3, CF3-C4H8-Ph(2F6F)-Ph-C6H 12 -CF3, CF3-C4H8-Ph-Ph(6F)-C6H 12 -CF3, C5H 11 -Ph(2F)-CF2-CF2-Ph(3F)-C5H 11 , C8H 17 -Ph(6F)-CF2-CF2-Ph(6F)-C5H 11 , C3H7-Ph-CF2-CF2-Ph-C5H 11 , F-C3H6-Ph-CF2-CF2-Ph-C5H 10 -F, C5H 11 -Ph-Ph(3F)-Ph(3F5F)-CF2-O-Ph(3F5F)-F, C5H 11 -Ph(3F)-Ph(3F)-Ph(3F5F)-CF2-O-Ph(3F5F)-F, C5H 11 -Ph(5F)-Ph(3F)-Ph(3F5F)-CF2-O-Ph(3F5F)-F, F-C5H 10 -Ph(5F)-Ph(3F)-Ph(3F5F)-CF2-O-Ph(3F5F)-F, CH3-CH(F)-C5H 10 -Ph-Ph(3F5F)-Ph(3F5F)-CF2-O-Ph(3F5F)-F etc. at least one of them.

[0081] 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. In this preferred embodiment, the liquid crystal composition contains an appropriate proportion of the compounds represented by the general formula IV-1. Due to the synergistic effect of the rigid fluorinated aromatic nucleus and the flexible perfluoroalkyl side chain, it is more conducive to achieving high contrast, fast response, and wide temperature range stability.

[0082] Preferably, Component Four includes at least one of the compounds represented by General Formula IV-3. Based on the total weight of the liquid crystal composition, the total content of the compounds represented by General Formula IV-3 is 1% - 20%. In this preferred embodiment, the liquid crystal composition contains an appropriate proportion of the compounds represented by General Formula IV-3, which can, on the basis of the synergistic effect of the rigid fluorinated aromatic nucleus and the flexible perfluoroalkyl side chain, further reduce the viscosity through the synergistic effect of the ether bond and the perfluoroalkyl side chain, making it more conducive to optimizing optical properties, improving response speed, enhancing high and low temperature tolerance, and improving compatibility and stability.

[0083] Preferably in the present invention, the liquid crystal composition further includes Component Five, and Component Five is selected from at least one of the group consisting of the compounds represented by General Formula V-1, General Formula V-2, General Formula V-3, and General Formula V-4, where R 10 、R 12 、R 13 、R 14 each independently represents an alkyl group having 2 - 7 carbon atoms, R 11 represents an alkoxy group having 1 - 2 carbon atoms or an alkyl group having 2 - 7 carbon atoms, L1 and L2 each independently represent H or F, and Ring B and Ring C each independently represent cyclohexane or benzene ring. Among them, the alkyl groups of R 10 、R 12 、R 13 、R 14 can be the same or different from each other, and the alkyl group can be a straight-chain alkyl group or a branched-chain alkyl group. When R 11 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. L1 and L2 can be the same or different.

[0084] .

[0085] Among them, the terminal C3H7- group in the compounds represented by General Formula V-1, General Formula V-2, and General Formula V-4 can be straight-chain or branched-chain.

[0086] Exemplarily, Component Five can be selected from C3H7-Ch-COO-Ph-Ch-C3H7, C6H 13 -Ch-COO-Ph-Ch-C3H7, C3H7-Ph-COO-Ph-Ch-C3H7, C6H 13 -Ph-COO-Ph-Ch-C3H7, CH3O-Ph-COO-Ph-Ch-C3H7, CH3CH2O-Ph-COO-Ph-Ch-C3H7, C5H 11 -Ch-Ph-Ph(3F)-Ph-C5H 11 、C6H 13 -Ch-Ph-Ph-Ph-C6H 13 、C5H11 -Ch-Ph-Ph(2F3F)-Ch-C5H 11 、C5H 11 -Ch-Ch-COO-Ph-Ch-C3H7、C5H 11 -Ch-Ch-COO-Ch-Ch-C3H7、C3H7-Ch-Ch-COO-Ch-Ch-C3H7 or at least one of the like.

[0087] In the preferred embodiment of the present invention containing Component Five, Component Five cooperates with other components, can synergistically enhance the molecular orientation orderliness with the polycyclic compound through an ester bond, reduce light scattering, and the flexible chain of Component Five itself is also beneficial to reducing viscosity, thus being more conducive to high contrast and fast response.

[0088] Preferably, the content of Component Five in the liquid crystal composition is 5% - 15%.

[0089] Further preferably, in Component Five, R 11 represents methoxy, ethoxy, ethyl, n - propyl, n - butyl, n - pentyl, n - hexyl or n - heptyl. In this preferred embodiment, the appropriate group R 11 can form a dynamic equilibrium with polyfluorinated compounds using an alkyl chain (such as n - pentyl, n - hexyl) to inhibit phase separation. Polar groups such as methoxy and ethoxy enhance the molecular polarity. In addition, long - chain alkyls (such as n - heptyl) enhance the molecular flexibility and low - temperature fluidity, ensuring stable low - temperature performance, and being more conducive to achieving properties such as high contrast, fast response, wide - temperature - range stability and environmental tolerance.

[0090] 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.

[0091] In a second aspect, the present invention also provides a device, which includes the liquid crystal composition described in the first aspect.

[0092] In some preferred embodiments of the present invention, the device 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.

[0093] The dimming device can, for example, include at least one of a display device, a dimming window, a smart window, etc. The dimming window can, for example, be an automotive dimming window, an electronic curtain, etc., and is particularly suitable for automotive dimming windows that are often used in extremely cold and extremely hot scenarios.

[0094] The following details the examples of the present invention, which are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention. Among them, unless otherwise stated or stated to the contrary, alkyl refers to a straight - chain alkyl.

[0095] Example 1

[0096] A liquid crystal composition, the components and their contents are shown in Table 2.

[0097] The obtained liquid crystal compositions were respectively subjected to various performance tests, and the test results are shown in Table 3. The test methods are as follows:

[0098] The transition temperature from the liquid crystal phase state to the isotropic phase state of the liquid crystal composition is represented by Tni, and the test instrument is a melting point instrument.

[0099] The refractive index anisotropy of the liquid crystal composition is represented by Δn, and the test instrument is an Abbe refractometer. The wavelength of the yellow light lamp for testing is 589 nm.

[0100] The method for the high and low temperature cycle shock experiment is as follows: Take 1 g of the liquid crystal composition and place it in a sealed tube, and then place it in a high and low temperature test chamber. Cool it down to -40 °C and maintain it at -40 °C for 4 h, then heat it up to 110 °C and maintain it at 110 °C for 4 h, and then repeat the aforementioned low temperature and high temperature control processes 200 times.

[0101] Power consumption test: Inject the liquid crystal composition into the gap between the ITO sheet and the PET sheet (both with a size of 10 cm × 10 cm). Control the thickness of the liquid crystal composition layer to be 22 μm through this gap, apply a 20 V voltage to test the power consumption and response time, and the test instrument is a stopwatch.

[0102] Contrast test: Control the thickness of the liquid crystal composition layer to be 22 μm through the gap, apply the same 20 V voltage, measure the transmittance of the liquid crystal composition in the powered-on (transmissive state) and powered-off (dark state), and the test instrument is a spectrophotometer.

[0103] Examples 2 - 6

[0104] They were respectively carried out with reference to Example 1, the difference being that the components and their contents of the liquid crystal composition are shown in Table 2 respectively. The corresponding test results are shown in Table 3.

[0105] Table 2 (where the content is the percentage content based on the total weight of the liquid crystal composition)

[0106]

[0107] Example 7

[0108] It is carried out with reference to Example 1, except that the sum of the contents of the compounds shown in Formula I-a, Formula I-b, Formula I-c, Formula I-d, and Formula I-e in Component 1 remains unchanged. However, among them, the content of the compound shown in Formula I-d and the content of the compound shown in Formula I-c are swapped, that is, the content of the compound shown in Formula I-d is 5%, and the content of the compound shown in Formula I-c 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.

[0109] And corresponding performance tests are carried out, and the test results are shown in Table 3.

[0110] Example 8

[0111] It is carried out with reference to Example 1, except that Component 1 does not contain the compound shown in Formula I-e, and the content of the compound shown in Formula I-d 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.

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

[0113] Example 9

[0114] It is carried out with reference to Example 1, except that Component 1 does not contain the compound shown in Formula I-a, and the content of the compound shown in Formula I-d 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.

[0115] And corresponding performance tests are carried out, and the test results are shown in Table 3.

[0116] Example 10

[0117] It is carried out with reference to Example 1, except that Component 1 does not contain the compounds shown in Formula I-a, Formula I-b, Formula I-c, and Formula I-e. Component 1 only contains the compound shown in Formula I-d 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.

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

[0119] Example 11

[0120] It is carried out with reference to Example 1, except that in the compound shown in Formula I-d in Component 1, C5H 11 - is a branched alkyl group, not the straight-chain alkyl group in Example 1, C5H 11-Specifically, it is isopentyl.

[0121] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0122] Example 12

[0123] Refer to Example 1, the difference is that the compound shown in general formula II-2 (the compound shown in formula II-2-a, the compound shown in formula II-2-b, and the compound shown in formula II-2-c) is not contained in Component II, and 100% is supplemented equally by the compound shown in formula II-3-a and the compound shown in 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.

[0124] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0125] Example 13

[0126] Refer to Example 1, the difference is that the compound shown in general formula II-1 (the compound shown in formula II-1-a and the compound shown in formula II-1-b) is not contained in Component II, and 100% is supplemented equally by the compound shown in formula II-3-a and the compound shown in 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.

[0127] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0128] Example 14

[0129] Refer to Example 1, the difference is that the compound shown in general formula II-3 (the compound shown in formula II-3-a and the compound shown in formula II-3-b) is not contained in Component II, and 100% is supplemented equally by the compound shown in formula II-1-a and the compound shown in 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.

[0130] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0131] Example 15

[0132] Refer to Example 1, the difference is that the compound shown in formula II-3-b is not contained in Component II, and 100% is supplemented by the compound shown in 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.

[0133] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0134] Example 16

[0135] Refer to Example 1, the difference is that in Component II, the C5H in the compound shown by Formula II-3-b 11 - is a branched alkyl group, not the straight-chain alkyl group in Example 1, and C5H 11 - is specifically an isopentyl group.

[0136] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0137] Example 17

[0138] Refer to Example 1, the difference is that Component III does not contain the compound shown by General Formula III-1 (the compound shown by Formula III-1-a and the compound shown by Formula III-1-b), and is supplemented to 100% by the compound shown by 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.

[0139] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0140] Example 18

[0141] Refer to Example 1, the difference is that Component III does not contain the compound shown by General Formula III-2 (including the compound shown by Formula III-2-a, the compound shown by Formula III-2-b and other compounds conforming to this general formula), and is supplemented to 100% by the compound shown by 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.

[0142] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0143] Example 19

[0144] Refer to Example 1, the difference is that Component III does not contain the compound shown by General Formula III-3 (the compound shown by Formula III-3-a and the compound shown by Formula III-3-b), and is supplemented to 100% by the compound shown by 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.

[0145] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0146] Example 20

[0147] It was carried out with reference to Example 1, except that the compound shown by the general formula III-4 (the compound shown by the formula III-4-a and the compound shown by the formula III-4-b) was not contained in Component III, and 100% was supplemented by the compound shown by the formula III-5-b; in the liquid crystal composition of this scheme, the total weight content of F was 4.1%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:2.6.

[0148] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0149] Example 21

[0150] It was carried out with reference to Example 1, except that the compound shown by the general formula III-5 (the compound shown by the formula III-5-a and the compound shown by the formula III-5-b) was not contained in Component III, and 100% was supplemented by the compound shown by the formula III-1-b; in the liquid crystal composition of this scheme, the total weight content of F was 4.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:2.8.

[0151] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0152] Example 22

[0153] It was carried out with reference to Example 1, except that the compound shown by the formula III-5-b was not contained in Component III, and 100% was supplemented by the compound shown by the formula III-5-a; in the liquid crystal composition of this scheme, the total weight content of F was 4.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:2.6.

[0154] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0155] Example 23

[0156] It was carried out with reference to Example 1, except that C4H9-Ph-Ph(3F)-Ph-CN (general formula III-2) was not contained in Component III, and 100% was supplemented by the compound shown by the formula III-2-b; in the liquid crystal composition of this scheme, the total weight content of F was 4.5%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:2.3.

[0157] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0158] Example 24

[0159] It was carried out with reference to Example 1, except that the substituents of the compound shown by the general formula IV-1 in Component IV were changed, specifically CF3-C8H 16 -Ph(2F)-Ph(2F)-C5H 10-CF3 (i.e., P1 and P2 are 8 and 5 respectively, and some of X1, X2, X3, X4 are F), with the content remaining unchanged; in the liquid crystal composition of this solution, 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.

[0160] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0161] Example 25

[0162] Refer to Example 1, the difference is that in Component Four, the compound shown in General Formula IV-2 (where R0 are all n-propyl, and X5, X6, X7, X8 are all H) is used to replace the compound of General Formula IV-1 in Example 1, with the content remaining unchanged. In the liquid crystal composition of this solution, 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.

[0163] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0164] Example 26

[0165] Refer to Example 1, the difference is that in Component Four, the compound shown in General Formula IV-2 (where R0 are all F-CH2CH2CH2-, and X5, X6, X7, X8 are all F) is used to replace the compound of General Formula IV-1 in Example 1, with the content remaining unchanged. In the liquid crystal composition of this solution, 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.

[0166] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0167] Example 27

[0168] Refer to Example 1, the difference is that the structure of the compound of General Formula IV-3 in Component Four is different, specifically F-C5H 10 -Ph(3F5F)-Ph(3F)-Ph(3F5F)-CF2-O-Ph(3F5F)-F, with the content remaining unchanged. In the liquid crystal composition of this solution, 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.

[0169] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0170] Example 28

[0171] It is carried out with reference to Example 1, except that the structure of the compound of General Formula V-3 in Component Five is different. The ring B in the compound of General Formula V-3 in Example 1 is replaced with cyclohexane, and the content remains unchanged. In the liquid crystal composition of this solution, 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.

[0172] And corresponding performance tests are carried out, and the test results are shown in Table 3.

[0173] Example 29

[0174] It is carried out with reference to Example 1, except that Component Five is not included, that is, the compounds shown in General Formula V-1, General Formula V-2, General Formula V-3, and General Formula V-4 are not included, and the total amount of 100% is supplemented with the compound shown in Formula I-d. In the liquid crystal composition of this solution, 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.

[0175] And corresponding performance tests are carried out, and the test results are shown in Table 3.

[0176] Comparative Example 1

[0177] It is carried out with reference to Example 1, except that Component Four (that is, the compounds shown in General Formula IV-1, General Formula IV-2, and General Formula IV-3) is not included, and Component Five (that is, the compounds shown in General Formula V-1, General Formula V-2, General Formula V-3, and General Formula V-4) 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 solution, 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.

[0178] And corresponding performance tests are carried out, and the test results are shown in Table 3.

[0179] Comparative Example 2

[0180] It is carried out with reference to Example 1, except that Component Four (that is, the compounds shown in General Formula IV-1, General Formula IV-2, and General 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 solution, 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.

[0181] And corresponding performance tests are carried out, and the test results are shown in Table 3.

[0182] Comparative Example 3

[0183] It was carried out with reference to Example 1, except that Component III (i.e., the compounds represented by General Formula III-1, General Formula III-2, General Formula III-3, General Formula III-4, and General Formula III-5) was not included, and Component V (i.e., the compounds represented by General Formula V-1, General Formula V-2, General Formula V-3, and General Formula V-4) was not included, and the content of Component I was adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F was 3.2%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:3.5.

[0184] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0185] Comparative Example 4

[0186] It was carried out with reference to Example 1, except that Component III (i.e., the compounds represented by General Formula III-1, General Formula III-2, General Formula III-3, General Formula III-4, and General Formula III-5) was not included, and the content of Component I was adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F was 3.6%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:3.1.

[0187] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0188] Comparative Example 5

[0189] It was carried out with reference to Example 1, except that Component II (i.e., the compounds represented by General Formula II-1, General Formula II-2, and General Formula II-3) was not included, and Component V (i.e., the compounds represented by General Formula V-1, General Formula V-2, General Formula V-3, and General Formula V-4) was not included, and the content of Component I was adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F was 3.0%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:3.8.

[0190] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0191] Comparative Example 6

[0192] It was carried out with reference to Example 1, except that Component II (i.e., the compounds represented by General Formula II-1, General Formula II-2, and General Formula II-3) was not included, and the content of Component I was adjusted to make up the total amount of 100%; in the liquid crystal composition of this scheme, the total weight content of F was 3.4%, and the weight ratio of the total amount of F to the total amount of aromatic groups was 1:3.3.

[0193] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0194] Comparative Example 7

[0195] It was carried out with reference to Example 1, except that the structure of F in the compound shown by Formula II-3-b in Component II was different, specifically C5H 11 -Ch-Ph(3F)-Ph-CN, and the content of this compound remained unchanged.

[0196] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0197] Comparative Example 8

[0198] It was carried out with reference to Example 1, except that the structure of F in the compound shown by Formula III-5-a in Component III was different, specifically C3H7-Ph(3F)-Ph(3F)-Ph-CN, and the content of this compound remained unchanged.

[0199] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0200] Comparative Example 9

[0201] It was carried out with reference to Example 1, except that the numbers of P1 and P2 in the general formula IV-1 in Component IV were different and both were 1, specifically CF3-CH2-PhPh-CH2-CF3, and the content of this compound remained unchanged.

[0202] And corresponding performance tests were carried out, and the test results are shown in Table 3.

[0203] Table 3

[0204]

[0205] From the test data of the above examples and comparative examples, it can be seen that compared with the comparative examples, the example solutions provided by the present invention have a higher phase transition temperature, a faster response speed, and a high contrast. After the high and low temperature shock experiments, the power consumption of the solutions of the present invention did not increase significantly, indicating that the solutions of the present invention have high long-term stability for extremely low temperatures (-40°C) and high temperatures (110°C), good tolerance to high and low temperatures, and are suitable for outdoor use dimming devices, especially for automotive dimming windows that are often used in extremely cold and extremely hot scenarios. The solutions of the comparative examples cannot achieve the comprehensive effects of high contrast, fast response speed, and good tolerance to high and low temperatures.

[0206] From the above Examples 1 and 7-11, it can be seen that adopting the preferred Component I solution of the present invention is more conducive to improving the light modulation ability and driving efficiency and suppressing the risk of phase separation.

[0207] From the above Examples 1 and 12-16, it can be seen that adopting the preferred Component II solution of the present invention is more conducive to enhancing the high temperature stability and intermolecular dipole interaction, reducing the viscosity and optimizing the optical uniformity.

[0208] As can be seen from the above-mentioned Example 1 and Examples 17-23, adopting the preferred solution of Component Three of the present invention is more conducive to optimizing molecular arrangement and contrast, and ensuring the response speed in a wide temperature range.

[0209] As can be seen from the above-mentioned Example 1 and Examples 24-27, adopting the preferred solution of Component Four of the present invention is more conducive to achieving the coordination of high contrast and fast response, and enhancing the compatibility at high and low temperatures.

[0210] As can be seen from the above-mentioned Example 1 and Examples 28-29, adopting the preferred solution of Component Five of the present invention is more conducive to reducing light scattering and enhancing contrast, and enhancing low-temperature fluidity and environmental tolerance.

[0211] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of technical features. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that, Comprising: 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 selected from at least one of the compounds selected from the group consisting of the compounds represented by General Formula II-1, General Formula II-2, and General Formula II-3, wherein R2, R4, and R7 each independently represent an alkyl group having 2 to 5 carbon atoms; Component 3, which is selected from at least one of the compounds selected from the group consisting of the compounds represented by General Formula III-1, General Formula III-2, General Formula III-3, General Formula III-4, and General Formula III-5, wherein R3, R5, R6, R8, and R9 each independently represent an alkyl group having 2 to 7 carbon atoms; Component Four, which contains at least one of the compounds represented by General Formula IV-1 and at least one of the compounds represented by General Formula IV-3, wherein the total content of the compounds represented by General Formula IV-1 is 1% - 15%, and the total content of the compounds represented by General Formula IV-3 is 1% - 20%; wherein X1, X2, X3, X4, 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 hydrogens in the alkyl group may each independently be substituted by fluorine, and P1 and P2 each independently represent 4, 5, 6, 7 or 8; Wherein, based on the total weight of the liquid crystal composition, the content of Component 1 is 20% - 55%, the content of Component 2 is 10% - 50%, the content of Component 3 is 1% - 25%, and the content of Component 4 is 1% - 20%; Based on the total weight of the liquid crystal composition, the total weight content of F is 2% - 6%; the weight ratio of the total amount of F contained to the total amount of aromatic groups contained is 1:(1 - 5); The general formulas are as follows: 。 2. The liquid crystal composition according to claim 1, wherein Component 1 includes the compound represented by Formula I-d and at least one selected from the group consisting of the compounds represented by Formula I-a, Formula I-b, Formula I-c, and Formula I-e. Wherein, based on the total weight of the liquid crystal composition, the sum of the contents of the compounds represented by Formula I-a, Formula I-b, Formula I-c, Formula I-d, and Formula I-e is 20% - 50%; wherein, the general formulas are as follows: 。 3. The liquid crystal composition according to claim 2, characterized in that, Based on the total weight of the liquid crystal composition, the content of the compound represented by Formula I-a is 0 - 10%, the content of the compound represented by Formula I-b is 0 - 10%, the content of the compound represented by Formula I-c is 0 - 10%, the content of the compound represented by Formula I-d is 10% - 20%, and the content of the compound represented by Formula I-e is 0 - 10%.

4. The liquid crystal composition according to claim 1, wherein In Component 2, 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. 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%; wherein, the general formulas are as follows: 。 5. The liquid crystal composition according to claim 4, characterized in that, In Component 2, 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%.

6. The liquid crystal composition according to claim 1, wherein In Component 3, the compound represented by General Formula III-1 is selected from the compound represented by Formula III-1-a and / or the compound represented by Formula III-1-b, the compound represented by General Formula III-2 is selected from the compound represented by Formula III-2-a and / or the compound represented by Formula III-2-b, the compound represented by General Formula III-3 is selected from the compound represented by Formula III-3-a and / or the compound represented by Formula III-3-b, the compound represented by General Formula III-4 is selected from the compound represented by Formula III-4-a and / or the compound represented by Formula III-4-b, the compound represented by General Formula III-5 is selected from the compound represented by Formula III-5-a and / or the compound represented by 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%. Among them, the respective general formulas are as follows: 。 7. The liquid crystal composition according to claim 6, wherein Based on the total weight of the liquid crystal composition, the content of the compound represented by Formula III-1-a is 0 - 1%, the content of the compound represented by Formula III-1-b is 0 - 3%, the content of the compound represented by Formula III-2-a is 0 - 3%, the content of the compound represented by Formula III-2-b is 0 - 1%, the content of the compound represented by Formula III-3-a is 0 - 4%, the content of the compound represented by Formula III-3-b is 0 - 4%, the content of the compound represented by Formula III-4-a is 0 - 2%, the content of the compound represented by Formula III-4-b is 0 - 3%, the content of the compound represented by Formula III-5-a is 0 - 4%, and the content of the compound represented by Formula III-5-b is 0 - 5%.

8. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further comprises Component Five, and Component Five is selected from at least one of the compounds represented by General Formula V-1, General Formula V-2, General Formula V-3, and 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 respective general formulas are as follows: 。 9. The liquid crystal composition according to claim 8, wherein In Component Five, R 11 represents methoxy, ethoxy, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl or n-heptyl.

10. A component, which comprises the liquid crystal composition according to any one of Claims 1 - 9.

11. The element according to claim 10, characterized in that, The component is an electro - controlled dimming device.

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