Method for preparing liquid crystal thin film material with controllable reflection bandwidth

A technology of liquid crystal film and wide bandwidth, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve problems such as difficult process control and complicated equipment

Inactive Publication Date: 2008-03-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a preparation method of a liquid crystal thin film material with controllable reflection bandwidth, which can control the reflection bandwidth and reflection center by selecting powders with different pitches and adjusting the ratio between them, and the prepared liquid crystal thin film material has semi-transparent The semi-reflective characteristics can cover the entire visible light, near-infrared, and infrared bands through appropriate deployment, and can realize broadband reflection, and overcome the problems of complex equipment and difficult process control

Method used

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  • Method for preparing liquid crystal thin film material with controllable reflection bandwidth
  • Method for preparing liquid crystal thin film material with controllable reflection bandwidth
  • Method for preparing liquid crystal thin film material with controllable reflection bandwidth

Examples

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Embodiment 1

[0083] Use photopolymerizable nematic liquid crystal monomer C6M, its molecular formula is as shown in photopolymerizable liquid crystal monomer (4), and the chiral compound is ZLI-4572 of Merck Company, and its molecular formula is as shown in chiral compound (20), Photoinitiator is the Irgacure 651 of TCI company, and its molecular formula is as shown in photoinitiator (25), is dissolved in acetone in different proportions, and wherein, photoinitiator Irgacure 651 accounts for 0.5% of gross weight; No. 1, 2, 3 The weight percentages of the components C6M / ZLI4572 corresponding to the curves are 87.8 / 12.2, 91.0 / 9.0, 93.7 / 12.2 respectively. Ultrasonic vibration makes the mixture evenly mixed. Under the condition of avoiding light, the solvent is vacuumed and evaporated, and the mixture is precipitated in a solid state. It is ground into a powder with a particle size of less than 3 μm for use. To prepare a thin film with a reflection wavelength of 400-800nm, powders with a singl...

Embodiment 2

[0085]Use photopolymerizable nematic liquid crystal monomer C6M, its molecular formula is as shown in photopolymerizable liquid crystal monomer (4), and the chiral compound is ZLI-4572 of Merck Company, and its molecular formula is as shown in chiral compound (20), Photoinitiator is the Irgacure 651 of TCI company, and its molecular formula is as shown in photoinitiator (25), is dissolved in acetone in different proportions, and wherein, photoinitiator Irgacure 651 accounts for 0.5% of gross weight, No. 4, 5, 6 The weight percentages of the components C6M / ZLI4572 corresponding to the curves are 96.6 / 3.4, 97.4 / 2.6, 98.1 / 1.9 respectively. Ultrasonic vibration makes the mixture evenly mixed. Under the condition of avoiding light, the solvent is vacuumed and evaporated, and the mixture is precipitated in a solid state. It is ground into a powder with a particle size of less than 3 μm for use. To prepare a thin film with a reflection wavelength width of 1100-2500nm, powders with a ...

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Abstract

The present invention is preparation process of liquid crystal film material with controllable reflecting bandwidth, and relates to preparation of material for light enhancing film and infrared shielding film for LCD. The liquid crystal film material is prepared through mixing nematic liquid crystal monomer capable of being light polymerized in 39.8-98.8 wt%, chiral compound in 1-60 wt% and photoinitiator in 0.2-5 wt% dissolved in solvent, and volatilizing the solvent to separate out cholest liquid crystal mixture; selecting powder of liquid crystal materials in different pitches based on required reflection bandwidth and reflection center and mixing; vacuum heating to cholest phase, pouring into preheated liquid crystal box in planar orientation, and ultraviolet radiating for 1-20 min for cross-linking reaction to prepare the liquid crystal film material. The liquid crystal film material has wide and adjustable reflection bandwidth.

Description

technical field [0001] The invention relates to the technical field of optical thin film materials, in particular to a method for preparing a liquid crystal display light enhancement film and an infrared light shielding film material. Background technique [0002] Cholesteric liquid crystal has selective Bragg reflection characteristics due to its special helical structure. This special optical property makes cholesteric liquid crystal widely used in the fields of light enhancement film of liquid crystal display, infrared light shielding film material and so on. How to effectively increase the reflection bandwidth is the key of this kind of technology. [0003] Cholesteric liquid crystals are nematic liquid crystals with chirality. There are generally two sources: one is that the liquid crystal molecules themselves have chiral groups, which are nematic phases with a helical structure, that is, cholesteric liquid crystals; In one case, a chiral compound is doped into the nem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/36G02F1/1335G02F1/13
Inventor 杨槐边震宇黄维
Owner UNIV OF SCI & TECH BEIJING
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