Crystalline-state nanocellulose-based double circularly polarized light/fluorescent thin film material as well as preparation method and application thereof to anti-counterfeiting label

A nanocellulose, circularly polarized light technology, applied in the direction of polarizing elements, optics, optical elements, etc., to achieve the effect of simple processing method, low cost, and diversified patterns
CN110540666AInactive Publication Date: 2019-12-06JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JILIN UNIV
Publication Date
2019-12-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a crystalline-state nanocellulose-based double circularly polarized light / fluorescent thin film material as well as a preparation method and application thereof to an anti-counterfeiting label and belongs to the technical field of circularly polarized light materials. A full-crystalline-state nanocellulose thin film with a left-handed chiral nematic structure having embeddednematic defects is obtained for the first time by adopting a one-step method through changing two self-assembling conditions including evaporation temperature and initial concentration of a crystalline-state nanocellulose colloidal solution and capturing a metastable-state crystalline-state nanocellulose nematic phase. The nematic defect structure has a half-wavelength retardation effect so thatchiral overturning of circularly polarized light is caused to obtain selectively reflected left-handed and right-handed double circularly polarized light; and a fluorescent object is embedded so as toobtain a double circularly polarized fluorescent signal regulated and controlled by an optical forbidden band in a range from a near ultraviolet waveband to a near infrared waveband. The thin film material can obtain different circularly polarized light patterns through different observation modes so as to realize the application of top-grade anti-counterfeiting labels.
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Description

technical field

[0001] The invention belongs to the technical field of circularly polarized light materials, and in particular relates to a crystalline nanocellulose-based double circularly polarized light / fluorescent film material, a preparation method and its application in anti-counterfeiting marks. Background technique

[0002] Cellulose is the natural polymer with the highest storage capacity in nature. Linear polysaccharides formed by D-glucose connected by β-1, 4 glycosidic bonds are mostly distributed in the cell walls of plants, and a few urochordates also contain cellulose in the capsule; in addition, cellulose also exists in in the secretions of some microorganisms. Natural cellulose includes crystalline and non-crystalline regions. The amorphous part of the non-crystalline region can be removed by hydrolysis with sulfuric acid to obtain cellulose in the crystalline region. The size ranges from 5-50nm, so it is called crystalline nanocellulose. Amorphous cellul...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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