Cholesteric liquid crystal and reflective-type circular polarization sheet thereof, and manufacturing method

A cholesteric liquid crystal, circular polarizer technology, applied in chemical instruments and methods, liquid crystal materials, polarizing elements, etc., can solve problems such as difficulty in large-scale production, and achieve widened reflection bandwidth, good thermo-mechanical stability, and widened options. The effect of reflection bandwidth

Active Publication Date: 2016-03-23
BEIJING LYRA MATERIAL TECH CO LTD
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Problems solved by technology

[0005] However, this method of preparing selectively reflective circular polarizers has relatively large defects, which makes it difficult to produce on a large scale

Method used

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  • Cholesteric liquid crystal and reflective-type circular polarization sheet thereof, and manufacturing method
  • Cholesteric liquid crystal and reflective-type circular polarization sheet thereof, and manufacturing method
  • Cholesteric liquid crystal and reflective-type circular polarization sheet thereof, and manufacturing method

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Embodiment Construction

[0040] In the following, the present invention will be further explained through specific embodiments in conjunction with the drawings.

[0041] Such as figure 1 As shown, the preparation method of the reflective circular polarizer based on cholesteric liquid crystal of this embodiment includes the following steps:

[0042] 1) Provide base material of polymer materials:

[0043] The substrate adopts a biaxially stretched polyethylene terephthalate film with a thickness of 20 μm.

[0044] 2) Using wire rod coating method to coat the guide layer on the substrate as a hydrogen bond donor:

[0045] Dilute the 50% polyethyleneimine PEI aqueous solution to 5%, coat it on the substrate with a wire rod with a wet film thickness of 6μm on a wire rod coater, and bake it in an oven at 70°C for 5 minutes. The water is removed to obtain a guide layer with a thickness of about 1 μm, which serves as a hydrogen bond donor.

[0046] 3) Coating cholesteric liquid crystal on the guiding layer as a hydrog...

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Abstract

The invention discloses a cholesteric liquid crystal and a reflective-type circular polarization sheet thereof, and a manufacturing method. In the invention, a base material is coated with a guiding layer and the cholesteric liquid crystal. Under an effect of an intermolecular hydrogen bond, a hydrogen bond acceptor is migrated to an interface of the guiding layer and the cholesteric liquid crystal so as to generate a concentration gradient of a chiral molecule. Through polymerization, a thread pitch gradient is fixed so as to realize wide wave reflection of the reflective-type circular polarization sheet. By using the manufacturing method in the invention, a traditional liquid crystal orientation technology is omitted; through forming the hydrogen bond, efficiency of realizing the thread pitch gradient is increased; the thread pitch gradient is realized without slow polymerization, which is good for realizing industrialization and scalization. In the invention, a polymerizable monomer material is preferably used; through the polymerization, a crosslinking polymer network is formed; and good thermal mechanical stability and good weather resistance are possessed; by using the manufacturing method in the invention, through repeated multilayer coating, a selection reflection bandwidth of the cholesteric liquid crystal can be greatly widened and a circular polarization sheet of ultra wide wave reflection can be manufactured.

Description

Technical field [0001] The invention relates to liquid crystal material technology, in particular to a cholesteric liquid crystal and a reflective circular polarizer and a preparation method thereof. Background technique [0002] Polarizer refers to an optical film that selectively allows light in a specific vibration direction to pass, and is mainly used to convert general unpolarized light into polarized light. Its mode of action is that when unpolarized light is emitted from the light source and passes through the polarizer, it is only allowed to pass through one of the two orthogonal linear optical axes. The currently widely used polarizer is an absorbing polarizer developed in the 1920s. Although this type of polarizer is cheap, it still has many shortcomings and deficiencies, such as large optical loss and limited working environment. The reflective polarizer has broad application prospects due to its excellent performance. This kind of polarizer can be made of ordered l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C09K19/38
CPCC09K19/3852C09K19/3857G02B5/3016
Inventor 张立培
Owner BEIJING LYRA MATERIAL TECH CO LTD
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