Novel self-alignment additive as well as preparation method and application thereof
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An additive and self-aligning technology, applied in chemical instruments and methods, liquid crystal materials, etc., can solve problems such as constraints, time-consuming, and increased production costs.
Inactive Publication Date: 2020-04-28
BEIJING BAYI SPACE LCD MATERIALS TECH
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However, this method has obvious shortcomings: the coating process of PI alignment film is cumbersome and takes a long time, which greatly increases the production cost
Rubbing alignment type PI alignment film will generate dust and static electricity during the rubbing process, which will affect the performance of the liquid crystal medium, and even damage the liquid crystal display element during the rubbing process; although the photo alignment type PI alignment material avoids the above defects, its effect on the liquid crystal The molecular anchoring ability is weak, and its application is also limited by the constraints of its own material properties.
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Embodiment 1
[0127] The structural formula of the liquid crystal compound is:
[0128]
[0129] The synthetic route for preparing compound BYLC-01 is as follows:
[0130]
[0131] Specific steps are as follows:
[0132] (1) Synthesis of compound BYLC-01-1:
[0133] Under nitrogen protection, add 45g (0.288mol), 150ml tetrahydrofuran, add dropwise 0.35mol n-butyllithium n-hexane solution at -70~-80°C under temperature control, react with temperature control for 1 hour after dropping, add 43.7g boric acid dropwise under temperature control at -60~-70°C Trimethyl ester (0.41mol), and then naturally warmed to -30°C. Add 400ml of 2M hydrochloric acid aqueous solution for acidification, perform conventional post-treatment, and recrystallize petroleum ether to obtain 54.3g of light yellow solid (compound BYLC-01-1, 0.272mol), HPLC: 99.7%, yield: 94.3%.
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Abstract
The invention relates to a novel self-alignment additive, the structural formula of the novel self-alignment additive is as shown in the specification, the additive disclosed by the invention is addedinto a liquid crystal compound, so that vertical self-alignment of liquid crystal molecules can be realized under the condition of not containing a polyimide alignment layer. The negative dielectricanisotropy of the liquid crystal compound is extremely high; and the liquid crystal compound has a relatively high clearing point, relatively high optical anisotropy, moderate rotary viscosity and liquid crystal intersolubility, has an excellent working effect under a low-temperature condition, can effectively reduce driving voltage and improve the response speed of a liquid crystal display device, and has the characteristics of moderate optical anisotropy numerical value, high charge retention rate and the like. Moreover, the compound is low in price and stable in performance, and has wide application value.
Description
technical field [0001] The invention belongs to the technical field of liquid crystal materials, and relates to a novel self-alignment additive and a preparation method thereof, which realize vertical alignment of liquid crystal media without conventional polyimide alignment layers. Background technique [0002] In recent years, liquid crystal display devices have been widely used in various electronic devices such as smartphones, tablet computers, car navigation systems, televisions, and the like. Representative liquid crystal display modes include twisted nematic (TN) type, super twisted nematic (STN) type, in-plane switching (IPS) type, fringe field switching (FFS) type and vertical alignment (VA) type. Among them, the VA mode has attracted more and more attention due to its fast fall time, high contrast, wide viewing angle, and high-quality images. [0003] In conventional VA displays, after the glass substrate is made into electrodes, its surface needs to be coated wit...
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