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Preparation method of cellulose circular polarization thin film and cellulose linear polarization thin film and thin film products thereof

A cellulose and circular polarizing technology, which is applied in the preparation of cellulose circular and linear polarizing films and their products, can solve the problems of many influencing factors and complicated conditions for the formation of cholesteric liquid crystals.

Inactive Publication Date: 2013-12-25
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In Patent Document 1, a preparation method of sea squirt cellulose cholesteric liquid crystal (N*-LCs) film has been proposed, but the formation conditions of cholesteric liquid crystal are relatively complicated and there are many influencing factors

Method used

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  • Preparation method of cellulose circular polarization thin film and cellulose linear polarization thin film and thin film products thereof
  • Preparation method of cellulose circular polarization thin film and cellulose linear polarization thin film and thin film products thereof
  • Preparation method of cellulose circular polarization thin film and cellulose linear polarization thin film and thin film products thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Take 1g of sea squirt cellulose, mix it with 17.5ml of 64% concentrated sulfuric acid, heat it in an oil bath at 45°C with a collector type constant temperature heating magnetic stirrer, and stir for 10h.

[0022] (2) Add 500ml of deionized water to dilute and cool down to terminate the reaction. Use a centrifuge to remove the supernatant, add deionized water, wash and then centrifuge at a speed of 8000-12000rad / min, and repeat the operation until the upper layer becomes cloudy.

[0023] (3) Put the suspension into a dialysis bag and dialyze with deionized water until the external solution becomes neutral, then put the dialysis bag into 15% polyethylene glycol (PEG) to concentrate to the required concentration.

[0024] (4) The obtained milky white suspension was ultrasonically treated with an ultrasonic cell pulverizer in an ice-water bath with a power of 800W for 30 minutes (wherein the ultrasonic frequency was 1 second on and 1 second off).

[0025] (5) Prepare a...

Embodiment 2

[0028] In step (1), ascidian cellulose can be pretreated by chemical methods such as dimethyl sulfoxide (DMSO), ethylenediamine, and sodium hydroxide, and physical methods such as high temperature and steam explosion, so as to weaken the hydrogen bond and shorten the hydrolysis time. All the other steps are the same as in Example 1.

Embodiment 3

[0030] In step (2), large particles can be removed at a speed of 2000rpm, and then the supernatant liquid can be washed and centrifuged. All the other steps are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a cellulose circular polarization thin film and a cellulose linear polarization thin film and thin film products thereof. The preparation method is characterized in that cellulose cholesteric liquid crystals are obtained by using an ultrasonic method and are dried under a certain condition so as to prepare the cellulose circular polarization thin film; and meanwhile, cellulose macromolecular chains are effectively oriented by dissolving and regenerating celluloses, so that the cellulose linear polarization thin film is prepared. The polarization thin films prepared by the invention can be applied to optical display devices or auxiliary components and the like. Compared with conventional polaroids, the polarization thin films have the advantages that the used raw materials are rich, low in cost and environment-friendly; and the preparation method is simple and controllable and can be used for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a circular polarizing film and a linear polarizing film using cellulose as a raw material, and the products thereof can be applied to optical display devices or auxiliary components. Background technique [0002] As we all know, light is a kind of electromagnetic wave, and the vibration direction of its electric vector is perpendicular to the propagation direction, which is a transverse wave. Due to the disorder of the light-emitting mechanism of general light sources, the distribution (direction and size) of the electric vector of the light wave is symmetrical to the propagation direction, which is called natural light. When the electric vector distribution of light is no longer symmetrical to its propagation direction, it is called polarized light. The study of polarization phenomena occupies a very important position in the history of optics development. The polarization of light enables people to hav...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/04C08L5/08C08L29/04C08B15/02C08L1/02
Inventor 朴光哲张青张大为
Owner QINGDAO UNIV OF SCI & TECH
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