CN112480936B - Positive liquid crystal composition and application thereof - Google Patents
Positive liquid crystal composition and application thereof Download PDFInfo
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- CN112480936B CN112480936B CN201910865248.7A CN201910865248A CN112480936B CN 112480936 B CN112480936 B CN 112480936B CN 201910865248 A CN201910865248 A CN 201910865248A CN 112480936 B CN112480936 B CN 112480936B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
Abstract
The invention belongs to the field of liquid crystal display materials, and particularly relates to a positive liquid crystal composition and application thereof. The positive liquid crystal composition comprises the following components in parts by weight: (1)1 to 80 parts of a compound represented by the general formula I; (2)1 to 50 parts of a compound represented by the general formula II; (3)1 to 50 parts of a compound represented by the general formula III; (4)0 to 45 parts of a compound represented by the general formula IV. According to the invention, different single crystals are selected and mixed in a specific combination mode, so that the obtained liquid crystal composition can effectively widen the use temperature range of the existing liquid crystal composition, and the response time of the liquid crystal composition is obviously shortened.
Description
Technical Field
The invention belongs to the field of liquid crystal display materials, and particularly relates to a positive liquid crystal composition and application thereof.
Background
The wide-temperature liquid crystal display is mainly used for display modules of operation control systems of various military and civil airplanes, aviation and aerospace aircrafts and the like, has the characteristics of quick response time and ultra-wide viewing angle, and has the advantages of high reliability, ultra-high brightness, low reflectivity, visibility in sunlight and excellent visual effect. These special equipments and special applications require that the liquid crystal display device can normally work at-40 deg.C to 80 deg.C, however, the liquid crystal composition is difficult to satisfy the requirement at present.
The display of liquid crystal is based on the change of the state of liquid crystal molecules, and the response speed is much slower than that of atomic and electronic processes. At high temperature, after the liquid crystal molecules reach the clearing point, the liquid crystal is changed into liquid, displayed characters or patterns of the liquid crystal and a substrate of the liquid crystal generate intermodulation distortion, the substrate is blackened, and the definition is reduced (above 70 ℃); at low temperature, the viscosity of liquid crystal molecules is increased, so that the resistance of the state change of the liquid crystal molecules is increased, the response speed is obviously delayed, even the contrast is insufficient, and the definition can be reduced; therefore, the working temperature range can be widened by the improvement of the clearing point, and the response time can be effectively shortened by the reduction of the rotational viscosity.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a novel liquid crystal composition. According to the invention, different single crystals are selected and mixed in a specific combination mode, so that the obtained liquid crystal composition can effectively widen the use temperature range of the existing liquid crystal composition, and the response time of the liquid crystal composition is obviously shortened.
The positive liquid crystal composition comprises the following components in parts by weight:
(1)1 to 80 parts of a compound represented by the general formula I;
(2)1 to 50 parts of a compound represented by the general formula II;
(3)1 to 50 parts of a compound represented by the general formula III;
(4)0 to 45 parts of a compound represented by the general formula IV;
wherein, the structure of the compound represented by the general formula I is as follows:
the compound represented by formula II has the following structure:
the compound represented by formula III has the following structure:
the compound represented by formula IV has the following structure:
wherein R is1–R6Each independently represents an alkyl group of 1 to 12 carbon atoms in which one or more-CH groups2-the group may be substituted with O, S or CH ═ CH;
A1-A5each independently represents phenyl, cyclohexane, dioxane, fluorophenylene, difluorophenylene or cyclohexenyl;
a represents 0 or 1.
In an embodiment of the present invention, it is preferred that the compound represented by the general formula I is selected from one or more compounds of formulae I-A to I-B:
wherein R is1、R2Each independently represents a C1-C12 linear alkyl group, wherein one or more non-adjacent-CH groups2-may be substituted by-O-or CH ═ CH.
Further, the compound represented by the general formula I is selected from one or more of the following compounds:
the compound represented by the general formula I of the liquid crystal composition provided by the invention has the characteristics of low viscosity, low clearing point and excellent intersolubility. The liquid crystal material can be matched with other monomers, and can generate a synergistic effect between the monomers, so that the liquid crystal material is more favorable for improving the performance of liquid crystal, the service temperature range of the liquid crystal is widened, and the response time is shortened.
In an embodiment of the present invention, it is preferable that the compound represented by the general formula II is one or more selected from the group consisting of compounds of the formulae II-1 to II-8:
the compound represented by the general formula II has higher positive dielectric anisotropy and excellent intersolubility; the liquid crystal material can be matched with other monomers, and can generate a synergistic effect between the monomers, so that the liquid crystal material is more favorable for improving the performance of liquid crystal, the service temperature range of the liquid crystal is widened, and the response time is shortened.
In an embodiment of the present invention, it is preferable that the compound represented by the general formula III is selected from one or more compounds of the formulae III-1 to III-6:
the compound represented by the general formula III has high refractive index and excellent intersolubility; the liquid crystal material can be matched with other monomers, and can generate a synergistic effect between the monomers, so that the liquid crystal material is more favorable for improving the performance of liquid crystal, the service temperature range of the liquid crystal is widened, and the response time is shortened.
In an embodiment of the present invention, it is preferred that the compound represented by formula IV is selected from one or more compounds of formulae IV-1 to IV-8:
the compound represented by the general formula IV has the characteristics of high clearing point and excellent intersolubility. The liquid crystal material can be matched with other monomers, and can generate a synergistic effect between the monomers, so that the liquid crystal material is more favorable for improving the performance of liquid crystal, the service temperature range of the liquid crystal is widened, and the response time is shortened.
In order to further expand the working range, the liquid crystal composition comprises the following components in parts by weight:
1)10 to 75 parts of one or more compounds represented by the general formula I;
2) 1-45 parts of one or more compounds represented by a general formula II;
3)1 to 45 parts of one or more compounds represented by the general formula III;
4)0 to 35 parts of one or more compounds represented by the general formula IV;
preferably, the liquid crystal composition comprises the following components in parts by weight:
1) 20-75 parts of one or more compounds represented by the general formula I;
2)1 to 35 parts of one or more compounds represented by the general formula II;
3)1 to 35 parts of one or more compounds represented by the general formula III;
4)0 to 25 parts of one or more compounds represented by the general formula IV;
more preferably, the liquid crystal composition comprises the following components in parts by weight:
the sum of the parts by weight of the components according to the invention is preferably 100 parts.
According to the invention, different types of single crystals are screened and mixed in a specific combination mode, so that the obtained liquid crystal composition can effectively widen the usable temperature range of the liquid crystal, well improve the response time of the liquid crystal and has a wide application prospect.
The invention also provides the application of the liquid crystal composition in a TV liquid crystal display device with relatively large requirement on a temperature range.
The method for producing the liquid crystal composition of the present invention is not particularly limited, and it can be produced by a conventional method, for example, mixing two or more liquid crystal compounds at a high temperature and dissolving each other, that is, dissolving the liquid crystal compounds in a solvent for the compounds and mixing, and then distilling off the solvent under reduced pressure; or dissolving the component with small content in the main component with large content at high temperature, or dissolving the components in organic solvent, mixing the solutions, and removing the solvent to obtain the final product. Wherein the solvent can be acetone, chloroform or methanol.
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; v90 represents the threshold voltage (test conditions: 25 ℃; unit: V); cp represents the clearing point (unit:. degree. C.) of the liquid crystal composition; Δ n represents optical anisotropy (test condition: 25 ℃); deltaε represents the dielectric anisotropy (test conditions: 25 ℃ C., 1000 Hz).
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 1.
TABLE 1 radical structural code of liquid crystal compounds
Take the following compound structure as an example:
expressed as: 3CCV
Expressed as: 5CCUF
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
Taking the following liquid crystal compounds in percentage by weight and preparing the liquid crystal composition by the method disclosed by the invention, wherein the specific mixture ratio is shown in table 2, and cyclohexyl in all the following structural formulas is in a trans-form configuration:
TABLE 2 weight percentages and Performance parameters of the components in the liquid Crystal compositions
Example 2
Taking the following liquid crystal compounds in percentage by weight and preparing the liquid crystal composition by the method disclosed by the invention, wherein the specific mixture ratio is shown in table 3, and cyclohexyl in all the following structural formulas is in a trans-form configuration:
TABLE 3 weight percents of the components and the performance parameters of the liquid crystal compositions
Example 3
Taking the following liquid crystal compounds in percentage by weight and preparing the liquid crystal composition by the method disclosed by the invention, wherein the specific mixture ratio is shown in table 4, and cyclohexyl in all the following structural formulas is in a trans-form configuration:
TABLE 4 weight percents of the components and the performance parameters of the liquid crystal compositions
Example 4
Taking the following liquid crystal compounds in percentage by weight and preparing the liquid crystal composition by the method disclosed by the invention, wherein the specific mixture ratio is shown in table 5, and cyclohexyl in all the following structural formulas is in a trans-form configuration:
TABLE 5 weight percents of the components and Performance parameters of the liquid Crystal compositions
Comparative example 1
The composition of the liquid crystal composition of comparative example 1 is shown in Table 6.
TABLE 6 weight percents of the components and the performance parameters of the liquid crystal compositions
The liquid crystal compositions obtained in example 1 and comparative example 1 were compared together for each of their performance parameter values, see table 7.
TABLE 7 comparison of Performance parameters of liquid Crystal compositions
By comparison, it can be seen that: examples 1-5 provide liquid crystal mixtures with lower viscosity, higher clearing points, shorter response times, and higher operating windows than comparative example 1.
From the above embodiments, the liquid crystal composition provided by the present invention has the advantages of lower viscosity, higher clearing point, faster response speed and wider working range. Therefore, the liquid crystal composition provided by the invention is suitable for TV liquid crystal display devices with wide temperature working range requirements.
Claims (2)
1. A positive liquid crystal composition is characterized by comprising the following components in parts by weight:
the sum of the weight parts of the components is 100 parts.
2. Use of the positive liquid crystal composition according to claim 1 in a liquid crystal display device for TV.
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| CN104610983B (en) * | 2015-01-21 | 2017-01-11 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal composition containing 2-methyl-3,4,5-trifluorobenzene liquid crystal compound and application of liquid crystal composition |
| CN104673326B (en) * | 2015-02-04 | 2017-01-11 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal composition containing fluoroterphenyl compound and pentafluoropropenyl ester compound and application thereof |
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