CN107541221B - Liquid crystal composition containing polyfluorobiphenyl liquid crystal compound and application thereof - Google Patents

Liquid crystal composition containing polyfluorobiphenyl liquid crystal compound and application thereof Download PDF

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CN107541221B
CN107541221B CN201610503107.7A CN201610503107A CN107541221B CN 107541221 B CN107541221 B CN 107541221B CN 201610503107 A CN201610503107 A CN 201610503107A CN 107541221 B CN107541221 B CN 107541221B
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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 liquid crystal composition containing a polyfluorobiphenyl liquid crystal compound, which comprises one or more compounds represented by a general formula I and one or more compounds represented by a general formula II:

Description

Liquid crystal composition containing polyfluorobiphenyl liquid crystal compound and application thereof
Technical Field
The invention belongs to the technical field of liquid crystal, and particularly relates to a liquid crystal composition containing a polyfluorobiphenyl liquid crystal compound and application thereof.
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.
Specifically, the response time of the LCD depends on (gamma 1d ^2)/Keff (d is the thickness of the liquid crystal layer, gamma 1 is the liquid crystal rotational viscosity, and Keff is the effective elastic constant), therefore, the purposes of improving the response time can be achieved by reducing the rotational viscosity, reducing the thickness of the liquid crystal layer and improving the elastic constant, and the thickness of the liquid crystal layer depends on the design of the LCD; for liquid crystal compositions, it is most effective to reduce the rotational viscosity and the liquid crystal thickness.
The liquid crystal composition provided by the invention has low rotational viscosity, and can effectively reduce the response time of a liquid crystal display.
Disclosure of Invention
The first object of the present invention is to provide a liquid crystal composition containing a polyfluorobiphenyl liquid crystal compound, comprising one or more of compounds represented by the general formula I, one or more of compounds represented by the general formula II:
Figure BDA0001035459290000011
in the general formula I, R1、R2Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); l is1Represents H or F; z1Represents a single bond, CH2O or CH2CH2；A1Represents trans-1, 4-cyclohexyl or 1, 4-cyclohexenyl;
in the general formula II, R3、R4Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the2、A3Each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
The compound represented by the general formula I has a polyfluoro-substituted tricyclic biphenyl structure, and the compound has large negative dielectric anisotropy.
Specifically, the compound represented by the general formula I is selected from one or more of the formulas IA to IF:
Figure BDA0001035459290000021
wherein R is1Represents C2～C7A linear alkyl or linear alkenyl group of (a); r2Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
Preferably, the compound represented by formula I is selected from one or more of formulae IA1 to IF 36:
Figure BDA0001035459290000022
Figure BDA0001035459290000031
Figure BDA0001035459290000041
Figure BDA0001035459290000051
Figure BDA0001035459290000061
Figure BDA0001035459290000071
preferably, the compound of formula I provided by the present invention is preferably one or more of formula IA13, IA14, IA15, IA16, IA19, IA20, IA21, IA22, IA25, IA26, IA31, IA32, IB14, IB19, IB20, IB26, IB32, IC14, IC19, IC20, IC26, IC32, ID14, ID20, IE13, IE14, IE19, IE20, IF14, IF 20.
In the liquid crystal composition, the compound represented by the general formula I is used in an amount of 1-80%, preferably 1-20%, or 20-45%, or 45-75%, or 20-55%, or 3-26%, or 14-24%.
The compound of the general formula II provided by the invention is a compound with a two-ring structure, and the structure has low rotational viscosity, so that the rotational viscosity of the liquid crystal composition can be effectively reduced, and the response time of a liquid crystal display is prolonged.
Specifically, the compound of formula II is selected from one or more of formulae IIA to IIC:
Figure BDA0001035459290000072
wherein R is3Represents C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r4Represents C1～C7Linear alkyl, linear alkoxy or C2～C7Linear alkenyl groups of (a).
Preferably, the compounds of formula II provided by the present invention are selected from one or more of formula IIA1 to formula IIC 24:
Figure BDA0001035459290000073
Figure BDA0001035459290000081
more preferably, the compound of formula II provided by the present invention is selected from one or more of formulae IIA2, IIA6, IIA14, IIA18, IIA22, IIA23, IIA28, IIB10, IIB14, IIC2, IIC4, IIC15, IIC 20.
In the liquid crystal composition, the compound represented by the general formula II is used in an amount of 1 to 75%, preferably 10 to 70%, or 13 to 66%, or 25 to 55%, or 10 to 32%, or 30 to 50%, or 50 to 70%, or 50 to 66%, or 45 to 63%, or 40 to 66%.
The liquid crystal composition provided by the invention also comprises one or more compounds of the general formula III:
Figure BDA0001035459290000082
wherein R is5、R6Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the4Represents trans-1, 4-cyclohexyl, 1, 4-phenylene or 1, 4-cyclohexenyl; n is 0 or 1.
The compound represented by the general formula III is a liquid crystal compound containing a2, 3-difluoro-1, 4 phenyl structure, and the compound has larger negative dielectric anisotropy.
In particular, the compound of formula III is selected from one or more of formulae IIIA to IIIE:
Figure BDA0001035459290000083
wherein R is5Represents C2～C7A linear alkyl or linear alkenyl group of (a); r6Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
More preferably, the compound of formula III is selected from one or more of formulae IIIA1 to IIIE 36:
Figure BDA0001035459290000084
Figure BDA0001035459290000091
Figure BDA0001035459290000101
Figure BDA0001035459290000111
Figure BDA0001035459290000121
more preferably, the compound represented by the general formula III is selected from one or more of IIIA20, IIIA22, IIIA23, IIIA32, IIIB19, IIIB20, IIIB21, IIIB22, IIIB23, IIIC1, IIIC2, IIIC13, IIIC14, IIIC15, IIIC16, IIIC17, IIIC18, IIIC19, IIIC20, IIIC21, IIIC22, IIIC23, IIIC24, IIIC26, IIIC29, IIIC35, IIID14, IIID20, IIID26, IIIE13, IIIE14, IIIE19, IIIE20, IIIE 21.
In the liquid crystal composition, the compound represented by the general formula III is an optional additional component, and the amount of the compound is 0-75%, and when the component is added, the amount of the compound added is preferably 1-49%, or 14-63%, or 29-64%, or 14-49%, or 50-64%.
The liquid crystal compounds provided by the present invention further comprise one or more compounds represented by formula IV:
Figure BDA0001035459290000131
wherein R is7、R8Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the5Represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
The compound of the general formula IV provided by the invention is a neutral compound with a tricyclic structure, and the structure has lower rotational viscosity and higher clearing point.
Specifically, the compound represented by the general formula IV provided by the invention is selected from one or more of the formulas IVA to IVB:
Figure BDA0001035459290000132
wherein R is7Represents C2～C7Linear alkyl or linear alkenyl of R8Represents C1～C7Linear alkyl group of (1).
Preferably, the compound of formula IV is selected from one or more of IVA 1-IVB 24:
Figure BDA0001035459290000133
more preferably, the compound of formula IV is selected from one or more of formulae IVA2, IVA6, IVA10, IVA13, IVA16, IVB2, IVB6, IVB8, IVB15, IVB 17.
In the liquid crystal composition, the compound represented by the general formula IV is an optional additional component, and the amount of the compound is 0-40%, and when the component is added, the amount of the compound added is preferably 1-30%, or 2-23%, or 4-13%, or 3-10%.
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula V:
Figure BDA0001035459290000134
wherein R is9、R10Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); l is2Represents H or F.
The compound represented by the general formula V is a terphenyl compound containing a2, 3-difluorobenzene structure, and the compound has large optical anisotropy and large negative dielectric anisotropy.
Specifically, the compounds of the general formula V provided by the present invention are selected from one or more of VA and VB:
Figure BDA0001035459290000135
wherein R is9Represents C2～C7A linear alkyl or linear alkenyl group of (a); r10Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
Preferably, the compound represented by formula V is selected from one or more of formulae VA1 to VB 24:
Figure BDA0001035459290000141
Figure BDA0001035459290000151
more preferably, the compound represented by formula V is selected from one or more of formulae VA2, VA9, VA10, VA14, VA16, VA22, VB9, VB10, VB14, VB 22.
In the liquid crystal composition, the compound represented by the general formula V is an optional additional component, and the amount of the compound is 0-30%, and when the component is added, the amount of the compound added is preferably 1-20%, or 1-14%, or 5-14%.
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula VI:
Figure BDA0001035459290000152
wherein R is11、R12Each independently represent F, C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); l is3、L4、L5Each independently represents H or F.
The compound represented by formula VI is selected from one or more of formula VIA to formula VIC:
Figure BDA0001035459290000153
wherein R is11、R12Each independently represents C1～C7Straight chain alkyl or C2～C7Linear alkenyl groups of (a).
Preferably, the compound represented by formula VI is selected from one or more of the formulae VIA 1-VIC 6:
Figure BDA0001035459290000154
Figure BDA0001035459290000161
preferably, the compound represented by formula VI is selected from one or more of formulae VIA2, VIA3, VIA4, VIA6, VIA8, VIA17, VIA18, VIA19, VIA22, VIA23, VIA24, VIB2, VIB6, VIB7, VIB8 and VIC 2.
In the liquid crystal composition, the compound represented by the general formula VI is an optional additional component, and the amount of the compound is 0-40%, and when the component is added, the amount of the compound added is preferably 7-13%, or 15-23%, or 5-10%.
Specifically, the liquid crystal composition provided by the invention comprises the following compounds in percentage by weight:
(1) 1-80% of at least one compound represented by the general formula I;
(2)1 to 75% of at least one compound represented by the general formula II;
(3) 0 to 75% of at least one compound represented by the general formula III;
(4) 0 to 40% of at least one compound represented by the general formula IV;
(5) 0 to 30% of at least one compound represented by the general formula V;
(6) and 0-40% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 2-75% of at least one compound represented by the general formula I;
(2) 10-70% of at least one compound represented by the general formula II;
(3) 0 to 70% of at least one compound represented by the general formula III;
(4) 0 to 30% of at least one compound represented by the general formula IV;
(5) 0 to 20% of at least one compound represented by the general formula V;
(6) and 0 to 30% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-70% of at least one compound represented by the general formula I;
(2) 13 to 66% of at least one compound represented by the general formula II;
(3) 0 to 64% of at least one compound represented by the general formula III;
(4) 0 to 23% of at least one compound represented by the general formula IV;
(5) 0 to 14% of at least one compound represented by the general formula V;
(6) and 0 to 23% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 1-20% of at least one compound represented by the general formula I;
(2) 15 to 70% of at least one compound represented by the general formula II;
(3) 0 to 70% of at least one compound represented by the general formula III;
(4) 0 to 30% of at least one compound represented by the general formula IV;
(5) 0 to 20% of at least one compound represented by the general formula V;
(6) and 0 to 30% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-20% of at least one compound represented by the general formula I;
(2)19 to 66% of at least one compound represented by the general formula II;
(3) 0 to 64% of at least one compound represented by the general formula III;
(4) 0 to 23% of at least one compound represented by the general formula IV;
(5) 0 to 14% of at least one compound represented by the general formula V;
(6) and 0 to 23% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-45% of at least one compound represented by the general formula I;
(2) 10-70% of at least one compound represented by the general formula II;
(3) 0 to 70% of at least one compound represented by the general formula III;
(4) 0 to 25% of at least one compound represented by the general formula IV;
(5) 0 to 20% of at least one compound represented by the general formula V;
(6) and 0-20% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-45% of at least one compound represented by the general formula I;
(2) 13 to 66% of at least one compound represented by the general formula II;
(3) 0 to 63% of at least one compound represented by the general formula III;
(4) 0 to 19% of at least one compound represented by the general formula IV;
(5) 0 to 14% of at least one compound represented by the general formula V;
(6) and 0-15% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 45-75% of at least one compound represented by the general formula I;
(2) 25 to 55% of at least one compound represented by the general formula II;
(3) 0 to 10% of at least one compound represented by the general formula IV;
(4) and 0-20% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 45-70% of at least one compound represented by the general formula I;
(2) 30-55% of at least one compound represented by the general formula II;
(3) 0-2% of at least one compound represented by the general formula IV;
(4) and 0 to 7% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 2-75% of at least one compound represented by the general formula I;
(2) 10-32% of at least one compound represented by the general formula II;
(3) 0 to 70% of at least one compound represented by the general formula III;
(4) 0 to 30% of at least one compound represented by the general formula IV;
(5) 0 to 15% of at least one compound represented by the general formula V;
(6) and 0 to 25% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-70% of at least one compound represented by the general formula I;
(2) 13 to 32% of at least one compound represented by the general formula II;
(3) 0 to 64% of at least one compound represented by the general formula III;
(4) 0 to 23% of at least one compound represented by the general formula IV;
(5) 0 to 12% of at least one compound represented by the general formula V;
(6) and 0 to 23% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-70% of at least one compound represented by the general formula I;
(2) 30-50% of at least one compound represented by the general formula II;
(3) 0 to 60% of at least one compound represented by the general formula III;
(4) 0 to 25% of at least one compound represented by the general formula IV;
(5) 0 to 15% of at least one compound represented by the general formula V;
(6) and 0-20% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 5-70% of at least one compound represented by the general formula I;
(2) 30-50% of at least one compound represented by the general formula II;
(3) 0 to 52% of at least one compound represented by the general formula III;
(4) 0 to 18% of at least one compound represented by the general formula IV;
(5) 0 to 10% of at least one compound represented by the general formula V;
(6) and 0-15% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 15-50% of at least one compound represented by the general formula I;
(2) 50-70% of at least one compound represented by the general formula II;
(3) 0 to 20% of at least one compound represented by the general formula III;
(4) 0 to 25% of at least one compound represented by the general formula IV;
(5) 0 to 20% of at least one compound represented by the general formula V;
(6) and 0-15% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-45% of at least one compound represented by the general formula I;
(2) 50-66% of at least one compound represented by the general formula II;
(3) 0 to 14% of at least one compound represented by the general formula III;
(4) 0 to 19% of at least one compound represented by the general formula IV;
(5) 0 to 14% of at least one compound represented by the general formula V;
(6) and 0-11% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 15-75% of at least one compound represented by the general formula I;
(2) 25 to 70% of at least one compound represented by the general formula II;
(3) 0 to 25% of at least one compound represented by the general formula IV;
(4) 0 to 20% of at least one compound represented by the general formula V;
(5) and 0-15% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-70% of at least one compound represented by the general formula I;
(2) 30-66% of at least one compound represented by the general formula II;
(3) 0 to 19% of at least one compound represented by the general formula IV;
(4) 0 to 14% of at least one compound represented by the general formula V;
(5) and 0-11% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-30% of at least one compound represented by the general formula I;
(2) 20-70% of at least one compound represented by the general formula II;
(3) 1 to 49% of at least one compound represented by the general formula III;
(4) 0 to 30% of at least one compound represented by the general formula IV;
(5) 0 to 15% of at least one compound represented by the general formula V;
(6) and 0 to 30% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 5-26% of at least one compound represented by the general formula I;
(2) 23 to 66% of at least one compound represented by the general formula II;
(3) 14 to 49% of at least one compound represented by the general formula III;
(4) 0 to 23% of at least one compound represented by the general formula IV;
(5) 0 to 10% of at least one compound represented by the general formula V;
(6) and 0 to 23% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 2-30% of at least one compound represented by the general formula I;
(2) 10-40% of at least one compound represented by the general formula II;
(3) 50-70% of at least one compound represented by the general formula III;
(4) 0 to 25% of at least one compound represented by the general formula IV;
(5) 0 to 15% of at least one compound represented by the general formula V;
(6) and 0-15% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-24% of at least one compound represented by the general formula I;
(2) 13 to 36% of at least one compound represented by the general formula II;
(3) 50-64% of at least one compound represented by the general formula III;
(4) 0 to 18% of at least one compound represented by the general formula IV;
(5) 0 to 12% of at least one compound represented by the general formula V;
(6) and 0-13% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-70% of at least one compound represented by the general formula I;
(2) 30-66% of at least one compound represented by the general formula II;
(3) 0 to 18% of at least one compound represented by the general formula IV;
(4) and 0 to 7% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-55% of at least one compound represented by the general formula I;
(2) 40-66% of at least one compound represented by the general formula II;
(3) and 2-23% of at least one compound represented by the general formula IV and the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-26% of at least one compound represented by the general formula I;
(2) 13 to 66% of at least one compound represented by the general formula II;
(3) 14 to 64% of at least one compound represented by the general formula III;
(4) 0 to 23% of at least one compound represented by the general formula IV;
(5) and 0 to 23% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-26% of at least one compound represented by the general formula I;
(2) 20-60% of at least one compound represented by the general formula II;
(3) 14 to 64% of at least one compound represented by the general formula III;
(4) and 5-23% of at least one compound represented by the general formula IV and the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-75% of at least one compound represented by the general formula I;
(2) 10-70% of at least one compound represented by the general formula II;
(3) 0 to 70% of at least one compound represented by the general formula III;
(4) 0 to 20% of at least one compound represented by the general formula V;
(5) and 0 to 25% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 5-70% of at least one compound represented by the general formula I;
(2) 13 to 66% of at least one compound represented by the general formula II;
(3) 0 to 63% of at least one compound represented by the general formula III;
(4) 0 to 14% of at least one compound represented by the general formula V;
(5) and 0 to 23% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 2-60% of at least one compound represented by the general formula I;
(2) 15 to 70% of at least one compound represented by the general formula II;
(3) 0 to 70% of at least one compound represented by the general formula III;
(4) 1 to 30% of at least one compound represented by the general formula IV;
(5) 0 to 20% of at least one compound represented by the general formula V;
(6) and 0-13% of at least one compound represented by the general formula VI.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-53% of at least one compound represented by the general formula I;
(2) 20-66% of at least one compound represented by the general formula II;
(3) 0 to 64% of at least one compound represented by the general formula III;
(4) 2-23% of at least one compound represented by the general formula IV;
(5) 0 to 14% of at least one compound represented by the general formula V;
(6) and 0 to 7% of at least one compound represented by the general formula VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 3-26% of at least one compound represented by the general formula I;
(2) 19-60% of at least one compound represented by general formula II;
(3) 29-64% of at least one compound represented by the general formula III;
(4) 5-23% of at least one compound represented by general formulas IV, V and VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-55% of at least one compound represented by the general formula I;
(2) 40-66% of at least one compound represented by the general formula II;
(3) 5-26% of at least one compound represented by general formulas IV, V and VI.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-53% of at least one compound represented by the general formula I;
(2) 45-63% of at least one compound represented by a general formula II;
(3) 2-17% of at least one compound represented by the general formula IV.
In the invention, preferably, when the liquid crystal composition only contains the compounds shown in the general formula I and the general formula II, the amount of the compound shown in the general formula I is 34-70%, and the amount of the compound shown in the general formula II is 30-66%. Further preferably, in this case, the compound of the general formula I is preferably a compound of formula IA13, formula IA14, formula IA19, formula IA20, formula IA26, formula IB19, formula IB20, formula IB26, formula IC19, formula IC20, formula IE14, formula IE19, formula IE20 or formula IF 20; the compound of formula II is preferably a compound of formula IIA2, formula IIA6, formula IIC4 or formula IIC 20.
In the invention, preferably, when the liquid crystal composition only contains the compounds represented by the general formula I, the general formula II and the general formula III, the amount of the compound represented by the general formula I is 14-24%; the dosage of the compound in the general formula II is 13-60%; the dosage of the compound in the general formula III is 14-63%. Further preferably, in this case, the compound of the general formula I is preferably a compound of formula IA19, formula IA20 or formula IE 20; the compound of formula II is preferably compound of formula IIA2, formula IIA6, formula IIC4, formula IIC15 or formula IIC20, and the compound of formula III is preferably compound of formula IIIA20, formula IIIA22, formula IIIB20, formula IIIB22, formula IIIB23, formula IIIC14, formula IIIC17, formula IIIC19, formula IIIC20, formula IIIC21, formula IIIC22, formula IIIC23, formula IIIC35, formula IIID20, formula IIID26, formula IIIE19 or formula IIIE 20.
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; or by conventional method, such as dissolving the component with smaller content in the main component with larger content at higher temperature, or dissolving the components in organic solvent, such as acetone, chloroform or methanol, and mixing the solution to remove 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.
The liquid crystal composition provided by the invention also comprises one or more polymerizable compounds represented by the general formula VII:
Figure BDA0001035459290000211
wherein m represents 0 or 1; SP1、SP2Each independently represents a polymerizable group; l is6Represents H or F, L7 represents H, F, C1～C5Linear alkyl or linear alkoxy groups of (1).
Preferably, the polymerizable compound represented by formula VII is selected from one or more of formulas VIIA to VIIF:
Figure BDA0001035459290000212
Figure BDA0001035459290000221
wherein, SP1、SP2Each independently represents an acrylate group, a methacrylate group, a butenoate group or C2～C8A linear alkenyl group of (a);
more preferably, the polymerizable compound represented by formula VII is selected from one or more of the large groups represented by formulas VIIA1 to VIIF 3:
Figure BDA0001035459290000222
Figure BDA0001035459290000231
more preferably, the compound represented by formula VII is selected from one or more of formulas VIIA2, VIIB2, VIIC2, VIID2, VIIE2, VIIF 2.
The amount of the polymerizable compound with the general formula VII is 0.1-5% of the weight of other liquid crystal compounds in the liquid crystal composition; the preferable dosage is 0.2-1.0% of the weight of other liquid crystal compositions in the liquid crystal composition; more preferably, the amount of the liquid crystal composition is 0.3 to 0.5 percent of the weight of other liquid crystal compositions in the liquid crystal composition; the liquid crystal composition containing the polymerizable compound provided by the invention is used for a PSVA liquid crystal display.
The preparation method of the liquid crystal composition containing the polymerizable compound provided by the invention comprises the steps of pouring the liquid crystal composition containing the polymerizable compound into a liquid crystal screen, irradiating and polymerizing through UV light, and continuously applying voltage in the irradiation process. The polymerizable compounds in the liquid crystal composition polymerize under the irradiation of UV light, and a network-like structure is generated.
The compounds of the present invention are known and commercially available or prepared by conventional techniques in the art or available from the Beijing eight billion space-time liquid crystal materials GmbH.
On the basis of the common knowledge in the field, the above preferred conditions can be combined with each other to obtain the preferred embodiments of the invention.
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 structures of the groups in the liquid crystal compositions are represented by the codes shown in Table 1.
Table 1: radical structure code of liquid crystal composition
Figure BDA0001035459290000232
Figure BDA0001035459290000241
Take the following compound structure as an example:
Figure BDA0001035459290000242
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 BDA0001035459290000243
Figure BDA0001035459290000251
Example 2
Table 3: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000252
Example 3
Table 4: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000253
Example 4
Table 5: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000254
Example 5
Table 6: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000261
Example 6
Table 7: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000262
Example 7
Table 8: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000263
Example 8
Table 9: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000264
Figure BDA0001035459290000271
Example 9
Table 10: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000272
Example 10
Table 11: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000273
Example 11
Table 12: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000274
Figure BDA0001035459290000281
Example 12
Table 13: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000282
Example 13
Table 14: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000283
Example 14
Table 15: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000284
Figure BDA0001035459290000291
Example 15
Table 16: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000292
Example 16
Table 17: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000293
Example 17
Table 18: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000294
Example 18
Table 19: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000301
Example 19
Table 20: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000302
Example 20
Table 21: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000303
Example 21
Table 22: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000304
Figure BDA0001035459290000311
Example 22
Table 23: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000312
Example 23
Table 24: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000313
Example 24
Table 25: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000314
Figure BDA0001035459290000321
Example 25
Table 26: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000322
Example 26
Table 27: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000323
Example 27
Table 28: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000324
Example 28
Table 29: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000331
Example 29
Table 30: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000332
Example 30
Table 31: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000333
Example 31
Table 32: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000341
Example 32
Table 33: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000342
Example 33
Table 34: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000343
Figure BDA0001035459290000351
Example 34
Table 35: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000352
Example 35
Table 36: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000353
Example 36
Table 37: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000354
Figure BDA0001035459290000361
Example 37
Table 38: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000362
Example 38
Table 39: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000363
Example 39
Table 40: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000364
Example 40
Table 41: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000371
EXAMPLE 41
Table 42: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000372
Example 42
Table 43: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000373
Example 43
Table 44: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000374
Figure BDA0001035459290000381
Example 44
Table 45: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000382
Example 45
Table 46: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000383
Example 46
Table 47: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000384
Figure BDA0001035459290000391
Example 47
Table 48: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000392
Example 48
Table 49: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000393
Example 49
Table 50: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000394
Figure BDA0001035459290000401
Example 50
Table 51: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000402
Example 51
Table 52: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000403
Example 52
Table 53: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000404
Figure BDA0001035459290000411
Example 53
Table 54: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000412
Example 54
Table 55: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000413
Example 55
Table 56: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000414
Example 56
Table 57: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000421
Example 57
Table 58: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000422
Example 58
Table 59: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000423
Example 59
Table 60: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000424
Figure BDA0001035459290000431
Example 60
Table 61: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000432
Comparative example 1
Table 62: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0001035459290000433
The values of the various performance parameters of the liquid crystal compositions obtained in example 3 and comparative example 1 were compared together, see Table 63.
Table 63: comparison of Performance parameters of liquid Crystal compositions
Δn Δε Cp γ1 K11 K22 K33
Example 1 0.108 -3.8 90 80 14.9 7.5 16.8
Comparative example 1 0.108 -3.8 90 96 14.7 7.4 16.5
By comparison, it can be seen that: example 3 provides a liquid crystal composition having a low rotational viscosity, i.e., having a faster response time, compared to comparative example 1.
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.
Example 61
A liquid crystal mixture (PA1) for PSVA was prepared by adding 0.3% of polymerizable compound VIIA2 in mass percent to the nematic liquid crystal composition (N1) provided in example 1, and the nematic liquid crystal composition N1 and the PSVA mixture PA1 were charged into a standard VA test cell, and irradiated with UV (100mw/cm2) for two minutes under a voltage of 10V applied, and the pretilt angle, threshold voltage, and response time were measured, respectively. The test results are shown in Table 64:
table 64: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N1 89.5 2.21 17.3
PA1 82.5 1.83 8.4
Compared with the corresponding liquid crystal composition, the liquid crystal composition 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 prolonged.
Example 62
A liquid crystal mixture (PA3) for PSVA was prepared by adding 0.3% of polymerizable compound VIIA2 in mass percent to the nematic liquid crystal composition (N3) provided in example 3, and the nematic liquid crystal composition N3 and the PSVA mixture PA3 were charged into a standard VA test cell, and irradiated with UV (100mw/cm2) for two minutes under a voltage of 10V applied, and the pretilt angle, threshold voltage, and response time were measured, respectively. The test results are shown in table 65:
table 65: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N3 89.3 2.19 16.5
PA3 82.1 1.80 7.4
Compared with the corresponding liquid crystal composition, the liquid crystal composition 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 prolonged.
Example 63
The nematic liquid crystal composition (N5) provided in example 5 was taken and 0.4% of polymerizable compound VIIB2 was added by mass percentage to prepare a liquid crystal mixture (PB5) for PSVA, the nematic liquid crystal composition N5 and the PSVA mixture PB5 were charged into a standard VA test cell, and a pretilt angle, a threshold voltage and a response time were measured, respectively, by irradiating UV (100mw/cm2) for two minutes under a voltage of 10V. The test results are shown in Table 66:
table 66: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N5 89.8 2.09 18.0
PB5 81.6 1.72 8.9
Compared with the corresponding liquid crystal composition, the liquid crystal composition 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 prolonged.
Example 64
The nematic liquid crystal composition (N15) provided in example 15 was selected and added with 0.5% of polymerizable compound VIID2 by mass to prepare a liquid crystal mixture for PSVA (PD15), the nematic liquid crystal composition N15 and the PSVA mixture PD15 were charged into a standard VA test cell, and the pretilt angle, threshold voltage and response time were measured, respectively, by irradiating UV (100mw/cm2) for two minutes under a voltage of 10V. The test results are shown in table 67:
table 67: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N15 89.7 2.39 14.4
PD15 81.1 2.03 5.1
Compared with the corresponding liquid crystal composition, the liquid crystal composition 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 prolonged.
Example 65
The nematic liquid crystal composition (N52) provided in example 52 was selected and added with 0.4% of polymerizable compound VIIC2 by mass to prepare a liquid crystal mixture for PSVA (PC52), the nematic liquid crystal composition N52 and the PSVA mixture PC52 were charged into a standard VA test cell, and the pretilt angle, threshold voltage and response time were measured, respectively, by irradiating UV (100mw/cm2) for two minutes under a voltage of 10V. The test results are shown in Table 68:
table 68: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N52 89.4 2.43 15.1
PC52 81.0 2.06 5.8
Compared with the corresponding liquid crystal composition, the liquid crystal composition 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 prolonged.
Example 66
A liquid crystal mixture (PF50) for PSVA was prepared by adding 0.3% of polymerizable compound VIIF2 in mass percent to the nematic liquid crystal composition (N50) provided in example 50, and the nematic liquid crystal composition N50 and the PSVA mixture PF50 were charged into a standard VA test cell and irradiated with UV (100mw/cm2) for two minutes under a voltage of 10V applied to test the pretilt angle, threshold voltage and response time, respectively. The test results are shown in Table 69:
table 69: threshold voltage and response time test results
Item titl(°) V10(V) T(ms)
N50 89.4 2.40 15.3
PF50 81.4 2.05 6.1
Compared with the corresponding liquid crystal composition, the liquid crystal composition 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 prolonged. The liquid crystal composition provided by the invention is mixed with a polymerizable compound and then used for a PSVA liquid crystal display, so that the response time of the liquid crystal display can be effectively prolonged, and the display effect of the liquid crystal display is obviously improved.
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 (6)

1. A liquid crystal composition containing a polyfluorobiphenyl liquid crystal compound is characterized by comprising the following components:
Figure RE-FDF0000009700090000011
2. a liquid crystal composition containing a polyfluorobiphenyl liquid crystal compound is characterized by comprising the following components:
Figure RE-FDF0000009700090000012
Figure RE-FDF0000009700090000021
3. use of a liquid crystal composition according to claim 1 or 2 in a liquid crystal display.
4. Use according to claim 3, characterized in that: the liquid crystal display is an IPS, FFS or VA mode display.
5. Use according to claim 4, characterized in that: the VA mode display is a VA display, a MVA display, a PVA display or a PSVA display.
6. Use according to claim 3, characterized in that: the liquid crystal display is a PSVA liquid crystal display.
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