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A kind of cholesteric liquid crystal and its reflective circular polarizer and preparation method

A technology of cholesteric liquid crystals and circular polarizers, applied in chemical instruments and methods, liquid crystal materials, instruments, etc., can solve problems such as difficulty in large-scale production, achieve broad reflection bandwidth, good thermomechanical stability, and broaden selective reflection The effect of bandwidth

Active Publication Date: 2018-10-26
BEIJING LYRA MATERIAL TECH CO LTD
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  • Abstract
  • Description
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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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  • A kind of cholesteric liquid crystal and its reflective circular polarizer and preparation method
  • A kind of cholesteric liquid crystal and its reflective circular polarizer and preparation method
  • A kind of cholesteric liquid crystal and its reflective circular polarizer and preparation method

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Embodiment Construction

[0040] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

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

[0042] 1) Provide substrates for polymer materials:

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

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

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

[0046] 3) Coating cholesteric liquid crystal on the guide layer as a h...

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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 phase liquid crystal, 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 through, 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 polarizer widely used at present is the absorbing polarizer developed in the 1920s. Although this type of polarizer is cheap, there are still many shortcomings and deficiencies, such as large optical loss and limited working environment. Reflective polarizers have broad application prospects due to their excellent performance. Such polarizers can be pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/04
CPCC09K19/3852C09K19/3857G02B5/3016
Inventor 张立培
Owner BEIJING LYRA MATERIAL TECH CO LTD
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