CN107384442B - Negative dielectric anisotropy liquid crystal composition and application thereof - Google Patents

Negative dielectric anisotropy liquid crystal composition and application thereof Download PDF

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CN107384442B
CN107384442B CN201610323098.3A CN201610323098A CN107384442B CN 107384442 B CN107384442 B CN 107384442B CN 201610323098 A CN201610323098 A CN 201610323098A CN 107384442 B CN107384442 B CN 107384442B
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陈卯先
储士红
王杰
未欣
陈海光
姜天孟
郭云鹏
袁瑾
伍嘉琦
苏学辉
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Beijing Bayi Space LCD Technology Co Ltd
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Abstract

The invention relates to a negative dielectric anisotropy liquid crystal composition, which comprises at least one compound represented by a general formula I, at least one compound represented by a general formula II and at least one compound represented by a general formula III. The compound represented by the general formula I is a dicyclohexyl alkene compound, and the compound has very high rotational viscosity and excellent intersolubility; the compound represented by the general formula II is a liquid crystal compound containing cyclohexenyl and 2, 3-difluoro structures, and the structures have high negative dielectric anisotropy and low rotational viscosity, so that the negative dielectric anisotropy of the liquid crystal composition can be effectively improved; the compound represented by the general formula III is a compound containing 2, 3-difluorobenzene, and the compound has larger negative dielectric anisotropy and excellent intersolubility. The liquid crystal composition has low rotational viscosity through the synergistic effect of the components, can effectively reduce the response time of a liquid crystal display, and has excellent application effect.

Description

Negative dielectric anisotropy liquid crystal composition and application thereof
Technical Field
The invention relates to a liquid crystal composition, in particular to a liquid crystal composition which has negative dielectric anisotropy; more specifically, the liquid crystal composition provided by the invention contains a cyclohexene negative dielectric anisotropy compound.
Background
Liquid crystals are currently widely used in the field of information display, and have been used in optical communications (s.t.wu, d.k.yang.reflective Liquid Crystal display. wiley, 2001). In recent years, the application fields of liquid crystal compounds have been remarkably widened to various display devices, electro-optical devices, electronic components, sensors, and the like, and nematic liquid crystal compounds have been most widely used in flat panel displays, particularly in systems of TFT active matrix.
At present, the negative liquid crystal is widely used in a large-size liquid crystal display for a television, and particularly, the appearance of the PSVA technology makes the negative liquid crystal more popular; in recent years, a negative liquid crystal FFS display is widely used for a display of a mobile device such as a mobile phone, and because of its high transmittance, it can greatly reduce energy consumed by a backlight of the liquid crystal display, improve display quality of the liquid crystal display, and prolong a cruising time of the mobile device.
Negative liquid crystals, which were proposed at the beginning of the 80's last century, are mainly used in VA mode, and have major advantages in high contrast and major disadvantages in small viewing angle and slow response time. With the development of display technology, MVA, PVA, PSVA, and the like technologies have appeared in succession, solving the problems of response time and viewing angle. In recent years, as touch panels become mainstream in the market of mobile devices, IPS and FFS type hard-screen displays have inherent advantages, and both IPS and FFS type displays can use positive liquid crystals and negative liquid crystals, and the positive liquid crystals are aligned along the direction of electric field lines due to the bending electric field existing in the displays, thereby causing bending of molecules and lowering of transmittance; the negative liquid crystal is arranged perpendicular to the direction of the electric field lines, so that the transmittance is greatly improved, and the method is the best method for improving the transmittance and reducing the backlight power consumption at present. However, the response time problem of negative liquid crystals is a significant problem that is currently encountered, and FFS displays using negative liquid crystals have a response time that is 50% or more slower than FFS displays using positive liquid crystals. Therefore, how to increase the response time of the negative liquid crystal is a key issue at present.
In particular, the response time of the liquid crystal display depends on d2Gamma 1/Keff (where d is the thickness of the liquid crystal layer, gamma 1 is the rotational viscosity of the liquid crystal, and Keff is the effective elastic constant), therefore, the purpose of improving the response time can be achieved by reducing the rotational viscosity, reducing the thickness of the liquid crystal layer and increasing the elastic constant, and the thickness of the liquid crystal layer depends on the design of the liquid crystal display; for liquid crystal compositions, it is most effective to reduce the rotational viscosity and the liquid crystal thickness.
Disclosure of Invention
The invention aims to provide a fast-response liquid crystal composition with negative dielectric anisotropy, which has low rotational viscosity and can effectively reduce the response time of a liquid crystal display.
Specifically, the fast-response negative dielectric anisotropy liquid crystal composition provided by the invention comprises at least one compound represented by a general formula I, at least one compound represented by a general formula II and at least one compound represented by a general formula III.
The compound represented by the general formula I is a dicyclohexyl alkene compound, and the compound has very high rotational viscosity and excellent intersolubility. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is preferably 100%; the content of the compound of the general formula I in the composition is preferably 1-60%, more preferably 10-40%, 24-50%, 20-40%, 24-40%, 10-27%, 13-27%, 10-35%, 13-31%, 15-45%, 19-40%, 13-37%, 13-35%, 20-35%, 27-35% or 20%. Specifically, the general formula I is as follows:
Figure BDA0000991164540000011
in the general formula I, R1Represents C1～C12Linear alkyl radical of (2), R2Represents H or C1～C12Linear alkyl group of (1).
Preferably, the compound represented by formula I is selected from one or more of IA, IB:
Figure BDA0000991164540000021
in IA and IB, R1Represents C1～C7Linear alkyl group of (1).
More preferably, the compound represented by the general formula I is selected from one or more of IA 1-IA 4 or IB 1-IB 4:
Figure BDA0000991164540000022
most preferably, the compound represented by formula I is selected from one or more of IA2, IB1, IB 2.
The compound represented by the general formula II is a liquid crystal compound containing cyclohexenyl and 2, 3-difluoro structures, and the structures have high negative dielectric anisotropy and low rotational viscosity, so that the negative dielectric anisotropy of the liquid crystal composition can be effectively improved. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is preferably 100%; the content of the compound of the general formula II in the composition is preferably 1-70%, more preferably 5-65%, 10-56%, 12-65%, 17-57%, 40-65%, 40-57%, 5-45%, 10-40%, 5-60%, 20-65%, 26-57%, 15-60%, 17-57%, 10-57%, 43-57%, 5-55%, 10-49%, 56-57%, 17-40%, 38-40% or 17-32%. Specifically, the formula II is as follows:
Figure BDA0000991164540000023
in the general formula II, R3Represents C1～C12Linear alkyl radical of (2), R4Represents C1～C12Linear alkyl or linear alkoxy of (a); n and m independently represent 0 or 1, and n and m are not 0 at the same time;
ring A1Represents:
Figure BDA0000991164540000024
preferably, the compound represented by formula II is selected from one or more of IIA to IID:
Figure BDA0000991164540000025
in the IIA to IID, R3Represents C1～C7The linear alkyl group of (1); r4Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
More preferably, the compound represented by the general formula II is selected from one or more of IIA 1-IIA 24, IIB 1-IIB 24, IIC 1-IIC 24 or IID 1-IID 24:
Figure BDA0000991164540000026
Figure BDA0000991164540000031
Figure BDA0000991164540000041
Figure BDA0000991164540000051
Figure BDA0000991164540000061
most preferably, the compound represented by formula II is selected from one or more of formulae IIA1, IIA2, IIA9, IIA10, IIA13, IIA14, IIA15, IIA16, IIA18, IIB1, IIB2, IIB9, IIB10, IIB13, IIB14, IIB15, IIB16, IIB18, IIC1, IIC2, IIC9, IIC10, IIC13, IIC14, IIC15, IID9, IID10, IID13, IID 14.
The compound represented by the general formula III of the invention is a compound containing 2, 3-difluorobenzene, and the compound has larger negative dielectric anisotropy and excellent intersolubility. In the liquid crystal composition provided by the invention, the sum of all liquid crystal components is preferably 100%; the content of the compound of the general formula III in the composition is preferably 1-40%, more preferably 5-35%, 10-65%, 15-29%, 10-30%, 15-26%, 5-35%, 10-29%, 5-20%, 10-20%, 20-36%, 20-29%, 5-30%, 5-24%, 10-29%, 15-24%, 20-24%, 10-19%, 10-15% or 17-19%. Specifically, the general formula III is specifically:
Figure BDA0000991164540000062
in the general formula III, R5、R6Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); the ring A2Represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
Preferably, the compound represented by formula III is selected from one or more of IIIA, IIIB:
Figure BDA0000991164540000063
in IIIA and IIIB, R5Represents C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r6Represents C1～C7Linear alkoxy groups of (1).
More preferably, the compound represented by formula III is selected from one or more of IIIA1 to IIIA24, IIIB to IIIB 24:
Figure BDA0000991164540000064
Figure BDA0000991164540000071
Figure BDA0000991164540000081
most preferably, the compound represented by formula III is selected from one or more of IIIA6, IIIA8, IIIA14, IIIB2, IIIB6, IIIB7, IIIB8, IIIB 19.
The liquid crystal composition provided by the invention can also comprise one or more compounds shown in the general formula IV. The compound of the general formula IV provided by the invention is a terphenyl structure compound, and the compound has very large optical anisotropy, and can effectively improve the optical anisotropy of the liquid crystal composition. When the composition contains the compound represented by the general formula IV, the content of the compound in the composition is 0-40%, preferably 0-15%, 0-11%, 0-20%, 0-24%, 0-30%, 0-15% or 0-8%, more preferably 1-30%, 5-24%, 5-11%, 9-24%, 9-15% or 23-24%. Specifically, the general formula IV is specifically:
Figure BDA0000991164540000082
in the general formula IV, R7、R8Each independently represents C1～C12Linear alkyl or linear alkoxy of (a); l is1、L2、L3Each independently represents H or F.
Preferably, the compound represented by formula IV is selected from one or more of IVA and IVB:
Figure BDA0000991164540000083
in the IVA and IVB, R7Represents C1～C7The linear alkyl group of (1); r8Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
More preferably, the compound represented by formula IV is selected from one or more of IVA 1-IVA 14, IVB 1-IVB 24:
Figure BDA0000991164540000084
Figure BDA0000991164540000091
Figure BDA0000991164540000101
most preferably, the compound of formula IV is selected from one or more of IVA3, IVA4, IVA6, IVB2, IVB10, IVB14, IVB 22.
The liquid crystal composition provided by the invention also comprises one or more compounds with the general formula V. The compound of the general formula V provided by the invention is a neutral compound with a two-ring structure or a three-ring structure, the structure has lower rotational viscosity, and the tricyclic compound also has a higher clearing point. When the composition contains the compound represented by the general formula V, the content of the compound in the composition is 0-60%, preferably 0-45%, 0-40%, 0-30%, 0-22%, 0-24%, 0-25%, 0-10%, 0-7%, 0-45%, more preferably 1-45%, 3-40%, 3-22%, 3-7% or 6-22%. The general formula V is specifically:
Figure BDA0000991164540000102
in the general formula V, R9Represents C1～C12Straight chain alkyl or C2～C12A linear alkenyl group of (a); r10Represents C1～C12Linear alkyl or linear alkoxy of (a); x is 0 or 1; ring A3Represents trans-1, 4-cyclohexylOr 1, 4-phenylene.
Preferably, the compound represented by formula V is selected from one or more of VA to VD:
Figure BDA0000991164540000103
in the VA to VD, R9Represents C2～C7Linear alkyl or linear alkenyl of R10Represents C1～C7Linear alkyl or linear alkenyl of (1).
More preferably, the compound represented by the general formula V is selected from one or more of VA 1-VA 16, VB 1-VB 24, VC 1-VC 18, VD 1-VD 20:
Figure BDA0000991164540000104
Figure BDA0000991164540000111
Figure BDA0000991164540000121
most preferably, the compound represented by formula V is selected from one or more of VA10, VA14, VB2, VB4, VB15, VB20, VC2, VC6, VC10, VC13, VC16, VD2, VD6, VD8, VD15, VD 17.
In order to enable the liquid crystal composition to meet different requirements, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 1-60% of a compound represented by the general formula I;
(2) 1-70% of a compound represented by the general formula II;
(3) 1-40% of a compound represented by the general formula III;
(4) 0 to 40% of a compound represented by the general formula IV;
(5) 0 to 60% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 24-50% of a compound represented by the general formula I;
(2) 5-65% of a compound represented by the general formula II;
(3) 5-35% of a compound represented by the general formula III;
(4) 0 to 20% of a compound represented by the general formula IV;
(5) 0 to 45% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 24-40% of a compound represented by the general formula I;
(2) 10-56% of a compound represented by the general formula II;
(3) 10-29% of a compound represented by the general formula III;
(4) 0 to 15% of a compound represented by the general formula IV;
(5) 0 to 40% of a compound represented by the general formula V;
preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 10-27% of a compound represented by the general formula I;
(2) 12-65% of a compound represented by the general formula II;
(3) 10-65% of a compound represented by the general formula III;
(4) 0 to 30% of a compound represented by the general formula IV;
(5) 0 to 30% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 13-27% of a compound represented by the general formula I;
(2) 17-57% of a compound represented by the general formula II;
(3) 15-29% of a compound represented by the general formula III;
(4) 0 to 24% of a compound represented by the general formula IV;
(5) 0 to 24% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 10-35% of a compound represented by the general formula I;
(2) 40-65% of a compound represented by the general formula II;
(3) 10-30% of a compound represented by the general formula III;
(4) 0 to 20% of a compound represented by the general formula IV;
(5) 0 to 10% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 13-31% of a compound represented by the general formula I;
(2) 40-57% of a compound represented by the general formula II;
(3) 15-26% of a compound represented by the general formula III;
(4) 0 to 15% of a compound represented by the general formula IV;
(5) 0 to 7% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 15-45% of a compound represented by the general formula I;
(2) 5-45% of a compound represented by the general formula II;
(3) 5-35% of a compound represented by the general formula III;
(4) 0 to 30% of a compound represented by the general formula IV;
(5) and 1-45% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 19-40% of a compound represented by the general formula I;
(2) 10-40% of a compound represented by the general formula II;
(3) 10-29% of a compound represented by the general formula III;
(4) 0 to 24% of a compound represented by the general formula IV;
(5) and 3-40% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 15-45% of a compound represented by the general formula I;
(2) 5-60% of a compound represented by the general formula II;
(3) 5-20% of a compound represented by the general formula III;
(4) 0 to 30% of a compound represented by the general formula IV;
(5) 0 to 45% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 20-40% of a compound represented by the general formula I;
(2) 10-56% of a compound represented by the general formula II;
(3) 10-20% of a compound represented by the general formula III;
(4) 0 to 24% of a compound represented by the general formula IV;
(5) 0-40% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 10-40% of a compound represented by the general formula I;
(2) 20-65% of a compound represented by the general formula II;
(3) 20-36% of a compound represented by the general formula III;
(4) 0 to 10% of a compound represented by the general formula IV;
(5) 0 to 30% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 13-37% of a compound represented by the general formula I;
(2) 26-57% of a compound represented by the general formula II;
(3) 20-29% of a compound represented by the general formula III;
(4) 0-8% of a compound represented by the general formula IV;
(5) 0 to 24% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 10-40% of a compound represented by the general formula I;
(2) 15-60% of a compound represented by the general formula II;
(3) 5-30% of a compound represented by the general formula III;
(4) 1-30% of a compound represented by the general formula IV;
(5) 0 to 25% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 13-35% of a compound represented by the general formula I;
(2) 17-57% of a compound represented by the general formula II;
(3) 10-24% of a compound represented by the general formula III;
(4) 5-24% of a compound represented by the general formula IV;
(5) 0 to 22% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 15-45% of a compound represented by the general formula I;
(2) 5-65% of a compound represented by the general formula II;
(3) 5-35% of a compound represented by the general formula III;
(4) 0 to 45% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 19-40% of a compound represented by the general formula I;
(2) 10-57% of a compound represented by the general formula II;
(3) 10-29% of a compound represented by the general formula III;
(4) 0-40% of a compound represented by the general formula V.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 10-35% of a compound represented by the general formula I;
(2) 40-65% of a compound represented by the general formula II;
(3) 10-30% of a compound represented by the general formula III;
(4) and 0-15% of a compound represented by the general formula IV.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 13-31% of a compound represented by the general formula I;
(2) 43-57% of a compound represented by the general formula II;
(3) 15-24% of a compound represented by the general formula III;
(4) 0-11% of a compound represented by the general formula IV.
Further preferably, the liquid crystal composition comprises the following components in percentage by mass:
(1) 13-31% of a compound represented by the general formula I;
(2) 43-57% of a compound represented by the general formula II;
(3) 15-24% of a compound represented by the general formula III;
(4) and 5-11% of a compound represented by the general formula IV.
Preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 15-45% of a compound represented by the general formula I;
(2) 5-55% of a compound represented by the general formula II;
(3) 5-35% of a compound represented by the general formula III;
(4) 0 to 30% of a compound represented by the general formula IV;
(5) and 1-45% of a compound represented by the general formula V.
More preferably, the liquid crystal compound provided by the invention comprises the following components in percentage by mass:
(1) 19-40% of a compound represented by the general formula I;
(2) 10-49% of a compound represented by the general formula II;
(3) 10-29% of a compound represented by the general formula III;
(4) 0 to 24% of a compound represented by the general formula IV;
(5) and 3-40% of a compound represented by the general formula V.
Further preferably, the liquid crystal composition comprises the following components in percentage by mass:
(1) 19-40% of a compound represented by the general formula I;
(2) 10-49% of a compound represented by the general formula II;
(3) 10-29% of a compound represented by the general formula III;
(4) and 3-40% of a compound represented by the general formula V.
Or, the liquid crystal composition comprises the following components in percentage by mass:
(1) 19-24% of a compound represented by the general formula I;
(2) 56-57% of a compound represented by the general formula II;
(3) and 20-24% of a compound represented by the general formula III.
Or, the liquid crystal composition comprises the following components in percentage by mass:
(1) 20-35% of a compound represented by the general formula I;
(2) 17-40% of a compound represented by the general formula II;
(3) 10-19% of a compound represented by the general formula III;
(4) 9-24% of a compound represented by the general formula IV;
(5) 3-22% of a compound represented by the general formula V;
preferably, the liquid crystal composition comprises the following components in percentage by mass:
(1) 27-35% of a compound represented by the general formula I;
(2) 38-40% of a compound represented by the general formula II;
(3) 10-15% of a compound represented by the general formula III;
(4) 9-15% of a compound represented by the general formula IV;
(5) 3-7% of a compound represented by the general formula V;
preferably, the liquid crystal composition comprises the following components in percentage by mass:
(1) 20% of a compound represented by the general formula I;
(2) 17-32% of a compound represented by the general formula II;
(3) 17-19% of a compound represented by the general formula III;
(4) 23-24% of a compound represented by the general formula IV;
(5) 6 to 22% of a compound represented by the general formula V.
The sum of the percentages of the components is preferably 100%.
The method for producing the liquid crystal composition of the present invention is not particularly limited, and it can be produced by mixing two or more compounds by a conventional method, such as a method of mixing the different components at a high temperature and dissolving each other, wherein the liquid crystal composition is dissolved and mixed in a solvent for the compounds, and then the solvent is distilled off under reduced pressure; alternatively, the liquid crystal composition of the present invention can be prepared by a conventional method, for example, by dissolving the component having a smaller content in the main component having a larger content at a higher temperature, or by dissolving each of the components in an organic solvent, for example, acetone, chloroform or methanol, and then mixing the solutions to remove the solvent.
The liquid crystal composition has low rotational viscosity, can be used for fast response liquid crystal display of various display modes, and can obviously improve the display effect of a liquid crystal display when being used in VA mode displays such as VA, MVA, PVA and PSVA, or IPS and FFS mode displays.
One or more polymerizable compounds represented by the general formula VI can also be added into the liquid crystal composition provided by the invention. Specifically, the addition amount of the polymerizable compound represented by the general formula VI is 0.1-5%, preferably 0.2-1%, and more preferably 0.3-0.5% of the total amount of the liquid crystal composition. Specifically, formula VI is shown below:
Figure BDA0000991164540000161
in the formula VI, ring A4Ring A5Each independently represents cyclohexyl, phenyl, halophenyl, preferably phenyl wherein 1 hydrogen atom is replaced by F; y represents 0, 1 or 2, preferably 1 or 2; SP1、SP2Each independently represents a polymerizable group.
Preferably, the compound represented by formula VI is selected from one or more of VIA to VIF:
Figure BDA0000991164540000162
among the VIA to VIF, SP1、SP2Each independently of the other represents acrylate, methacrylate, crotonate or C2～C8Linear alkenyl groups of (a).
More preferably, the polymerizable compound represented by the general formula VI is selected from one or more of VIA 1-VIA 3, VIB 1-VIB 3, VIC 1-VIC 3, VID 1-VID 3, VIE 1-VIE 3, VIF 1-VIF 3:
Figure BDA0000991164540000163
Figure BDA0000991164540000171
most preferably, the polymerizable compound represented by formula VI is selected from one or more of VIB2, VIC2, VID2, VIF 2.
When the polymerizable compound is added into the liquid crystal composition, the liquid crystal composition preferably comprises the following components in percentage by mass:
(1) 20% of a compound represented by the general formula I;
(2) 17-32% of a compound represented by the general formula II;
(3) 17-19% of a compound represented by the general formula III;
(4) 23-24% of a compound represented by the general formula IV;
(5) 6 to 22% of a compound represented by the general formula V.
After the polymerizable compound is added into the liquid crystal composition, the threshold voltage is reduced, the response time is accelerated, the response time of a liquid crystal display is obviously improved, and the liquid crystal composition is preferably used for a PSVA liquid crystal display.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Unless otherwise indicated, percentages in the present invention are weight percentages; the temperature units are centigrade; Δ n represents optical anisotropy (25 ℃); epsilon∥And ε⊥Respectively represent the parallel and perpendicular dielectric constants (25 ℃, 1000 Hz); Δ ε represents the dielectric anisotropy (25 ℃, 1000 Hz); γ 1 represents rotational viscosity (mpa.s, 25 ℃); cp represents the clearing point (. degree. C.) of the liquid crystal composition; k11、K22、K33Respectively representing the splay, twist and bend elastic constants (pN, 25 ℃).
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 1.
Table 1: radical structure code of liquid crystal compound
Figure BDA0000991164540000181
Figure BDA0000991164540000191
Take the following compound structure as an example:
Figure BDA0000991164540000192
expressed as: 3CSWO2
Figure BDA0000991164540000193
Expressed as: 2PWP3
In the following examples, the liquid crystal composition was prepared by a thermal dissolution method, comprising the steps of: weighing the liquid crystal compound by a balance according to the weight percentage, wherein the weighing and adding sequence has no specific requirements, generally weighing and mixing the liquid crystal compound in sequence from high melting point to low melting point, heating and stirring at 60-100 ℃ to uniformly melt all the components, filtering, performing rotary evaporation, and finally packaging to obtain the target sample.
In the following examples, the weight percentages of the components in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following tables.
Example 1
Table 2: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000194
Figure BDA0000991164540000201
Example 2
Table 3: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000202
Example 3
Table 4: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000203
Example 4
Table 5: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000204
Figure BDA0000991164540000211
Example 5
Table 6: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000212
Example 6
Table 7: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000213
Example 7
Table 8: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000214
Figure BDA0000991164540000221
Example 8
Table 9: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000222
Example 9
Table 10: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000223
Example 10
Table 11: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000224
Figure BDA0000991164540000231
Example 11
Table 12: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000232
Example 12
Table 13: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000233
Example 13
Table 14: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000234
Figure BDA0000991164540000241
Example 14
Table 15: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000242
Example 15
Table 16: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000243
Example 16
Table 17: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000244
Figure BDA0000991164540000251
Example 17
Table 18: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000252
Example 18
Table 19: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000253
Example 19
Table 20: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000254
Figure BDA0000991164540000261
Example 20
Table 21: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000262
Example 21
Table 22: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000263
Example 22
Table 23: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000264
Figure BDA0000991164540000271
Example 23
Table 24: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000272
Example 24
Table 25: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000273
Example 25
Table 26: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000274
Figure BDA0000991164540000281
Example 26
Table 27: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000282
Example 27
Table 28: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000283
Comparative example 1
Table 29: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000284
Figure BDA0000991164540000291
The liquid crystal compositions obtained in example 1 and comparative example 1 were compared together for each of their performance parameter values, see table 30.
Table 30: comparison of Performance parameters of liquid Crystal compositions
△n △ε Cp γ1 K11 K22 K33
Example 1 0.110 -4.0 91 87 15.2 7.6 16.6
Comparative example 1 0.108 -3.8 90 96 14.7 7.4 16.5
By comparison, it can be seen that: example 1 provides a liquid crystal composition having a low rotational viscosity, i.e., having a faster response time, compared to comparative example 1.
Example 28
Table 31: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000292
The polymerizable compound VIB2 was added to the nematic liquid crystal at 0.5% by mass to prepare a PSVA mixture of type PB 28.
The nematic liquid crystals and the PSVA mixture PB28 were charged into a standard VA test cell and UV (100 mw/cm)2) The pretilt angle, threshold voltage and response time were tested separately by irradiating for two minutes with a voltage of 10V applied. The test results are shown in Table 32:
table 32: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N28 89.5 2.71 15.1
PB28 82.0 2.28 6.2
Compared with the corresponding nematic liquid crystal, the liquid crystal compound with the polymerizable compound has the advantages that the threshold voltage is reduced after polymerization, the response time is accelerated, and the response time of the liquid crystal display is obviously improved.
Example 29
Table 33: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000301
The polymerizable compound VIC2 was added in an amount of 0.5% by mass to the above nematic liquid crystal to prepare a PSVA mixture of type PC 29.
Mixing nematic liquid crystal and PSVA PC27 into a standard VA test cell, UV (100 mw/cm)2) The pretilt angle, threshold voltage and response time were tested separately by irradiating for two minutes with a voltage of 10V applied. The test results are shown in Table 34:
table 34: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N29 89.6 2.54 15.2
PC29 83.1 2.23 6.6
Compared with the corresponding nematic liquid crystal, the liquid crystal compound with the polymerizable compound has the advantages that the threshold voltage is reduced after polymerization, the response time is accelerated, and the response time of the liquid crystal display is obviously improved.
Example 30
Table 35: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000991164540000302
The polymerizable compound VIE2 was added to the nematic liquid crystal in an amount of 0.3% by mass to prepare a PSVA mixture of PE 30.
The nematic liquid crystal and PSVA mixture PE30 was charged into a standard VA test cell and UV (100 mw/cm)2) The pretilt angle, threshold voltage and response time were tested separately by irradiating for two minutes with a voltage of 10V applied. The test results are shown in Table 36:
table 36: threshold voltage and response time test results
Figure BDA0000991164540000303
Figure BDA0000991164540000311
Compared with the corresponding nematic liquid crystal, the liquid crystal compound with the polymerizable compound has the advantages that the threshold voltage is reduced after polymerization, the response time is accelerated, and the response time of the liquid crystal display is obviously improved.
The negative dielectric anisotropy liquid crystal composition provided by the invention has low rotational viscosity, high resistivity and excellent light stability and thermal stability, is suitable for VA type liquid crystal displays such as VA, MVA, PVA and PSVA, or IPS and FFS type liquid crystal displays, and can effectively improve the response time of the liquid crystal display.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (12)

1. The negative dielectric anisotropy liquid crystal composition is characterized by comprising the following components in percentage by mass:
(1) 24-50% of a compound represented by the general formula I;
(2) 5-65% of a compound represented by the general formula II;
(3) 5-35% of a compound represented by the general formula III;
(4) 0 to 20% of a compound represented by the general formula IV;
(5) 0 to 45% of a compound represented by the general formula V;
the compound represented by the general formula I is selected from one or more of IA2, IB1 and IB 2:
Figure FDA0002893850190000011
the compound represented by the general formula II is selected from one or more of the following formulas IIA1, IIA2, IIA9, IIA10, IIA13, IIA14, IIA15, IIA16, IIA18, IIB1, IIB2, IIB9, IIB10, IIB13, IIB14, IIB15, IIB16, IIB18, IIC1, IIC2, IIC9, IIC10, IIC13, IIC14, IIC15, IID9, IID10, IID13 and IID 14:
Figure FDA0002893850190000012
Figure FDA0002893850190000021
the compound represented by the general formula III is selected from one or more of IIIA6, IIIA8, IIIA14, IIIB2, IIIB6, IIIB7, IIIB8 and IIIB 19:
Figure FDA0002893850190000022
the compound represented by formula IV is selected from one or more of IVA3, IVA4, IVA6, IVB2, IVB10, IVB14, IVB 22:
Figure FDA0002893850190000031
the compound represented by the general formula V is selected from one or more of VA10, VA14, VB2, VB4, VB15, VB20, VC2, VC6, VC10, VC13, VC16, VD2, VD6, VD8, VD15 and VD 17:
Figure FDA0002893850190000032
Figure FDA0002893850190000041
2. the liquid crystal composition according to claim 1, wherein the liquid crystal composition comprises the following components in percentage by mass:
(1) 24-40% of a compound represented by the general formula I;
(2) 10-56% of a compound represented by the general formula II;
(3) 10-29% of a compound represented by the general formula III;
(4) 0 to 15% of a compound represented by the general formula IV;
(5) 0-40% of a compound represented by the general formula V.
3. The liquid crystal composition according to claim 1, wherein the liquid crystal composition comprises the following components in percentage by mass:
(1) 27-35% of a compound represented by the general formula I;
(2) 38-40% of a compound represented by the general formula II;
(3) 10-15% of a compound represented by the general formula III;
(4) 9-15% of a compound represented by the general formula IV;
(5) and 3-7% of a compound represented by the general formula V.
4. The liquid crystal composition according to any one of claims 1 to 3, wherein a polymerizable compound VI is additionally added to the liquid crystal composition, and the polymerizable compound VI accounts for 0.1 to 5 percent of the total weight of the liquid crystal composition; formula VI is shown below:
Figure FDA0002893850190000042
in the formula VI, ring A4Ring A5Each independently represents cyclohexyl, phenyl, halophenyl; y represents 0, 1 or 2; SP1、SP2Each independently represents a polymerizable group.
5. The liquid crystal composition of claim 4, wherein the polymerizable compound VI is 0.2-1% of the total weight of the liquid crystal composition.
6. The liquid crystal composition of claim 4, wherein the polymerizable compound VI is present in an amount of 0.3 to 0.5% by weight based on the total weight of the liquid crystal composition.
7. The liquid crystal composition according to claim 4, wherein the compound represented by formula VI is one or more compounds selected from VIA to VIF:
Figure FDA0002893850190000043
Figure FDA0002893850190000051
among the VIA to VIF, SP1、SP2Each independently of the other represents acrylate, methacrylate, crotonate or C2～C8Linear alkenyl groups of (a).
8. The liquid crystal composition of claim 7, wherein the polymerizable compound represented by the general formula VI is one or more selected from the group consisting of VIA 1-VIA 3, VIB 1-VIB 3, VIC 1-VIC 3, VID 1-VID 3, VIE 1-VIE 3, VIF 1-VIF 3:
Figure FDA0002893850190000052
Figure FDA0002893850190000061
9. the liquid crystal composition of claim 8, wherein the polymerizable compound represented by formula VI is selected from one or more of VIB2, VIC2, VID2 and VIF 2.
10. Use of the liquid crystal composition according to any one of claims 1 to 9 in a liquid crystal display.
11. Use according to claim 10, wherein the liquid crystal display is a VA, MVA, PVA, PSVA, IPS or FFS mode display.
12. Use of the liquid crystal composition of any of claims 4 to 9 in a PSVA mode liquid crystal display.
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