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Angular photochromic material and its preparing method

A photochromic and photoinitiator technology, which is applied in the field of photochromic materials and their preparation, can solve the problems of unevenness and weak color rendering effect, and achieve the effects of wide application, durable color and easy color adjustment

Inactive Publication Date: 2005-03-16
SHANGHAI TECHSUN RFID TECHNOLGOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an inhomogeneous phase will be formed during thermal polymerization, making the color development effect weaker

Method used

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  • Angular photochromic material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 10g of cellulose (obtained by hydrolysis of cellulose acetate) in 210ml of pyridine, raise the temperature to reflux, add 50ml of phenylisocyanate, reflux for 48hrs, distill off most of the pyridine under reduced pressure, add 0.8l of methanol, precipitate the solid, filter , Dissolve the filter cake in 600ml of acetone, then add 0.8L of methanol to precipitate the product, filter, wash, and dry in vacuo. 20 g of product was obtained. It was confirmed by IR that the hydroxyl groups in the cellulose microcrystals had basically been completely esterified.

[0029] Dissolve 3.0g of the above-mentioned cellulose derivatives, 5.5g of trimethylolpropane trimethacrylate and 60mg of 2,2-methyl-2-phenylacetophenone in 100ml of acetone, stir vigorously for 2hr, and vacuum off Acetone, the residue is in the form of jelly. Apply this jelly on PET polyester film with a thickness of about 30 μm, place it in a 1.0T magnetic field for 1.0 min, and then cure it with ultraviole...

Embodiment 2～5

[0031] Dissolve 6.0g of the above-mentioned cellulose derivative, 11.0g of trimethylolpropane trimethacrylate and 120mg of 2,2-methyl-2-phenylacetophenone in 200ml of acetone, stir vigorously for 2hr, and remove the Acetone, apply an equal portion of the mixture on the PET film with a thickness of about 30 μm, place it in a magnetic field of different strength for 1.0min, and cure it under the same ultraviolet lamp to obtain a film that selectively reflects light of different wavelengths, as shown in the following table:

[0032] Magnetic Field Strength Film Color (90° Viewing Angle) Reflection Spectrum Absorption Peak (90° Viewing View)

Embodiment 2

[0033] Example 2 1.0T red 652nm

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Abstract

The present invention is a kind of angular photochromic material and its preparation process. The said material is one composite of cellulose derivative 20-60 wt% and polymerized monomer 40-80 wt%. The cellulose derivative, the polymerized monomer and photosensitive initiator are dissolved in solvent and mixed through stirring at room temperature; the mixture is depressed to eliminate solvent and obtain colloid matter; the colloid matter is painted to base film, 0.5-5.0 T magentic field processed and ultraviolet radiated to cure into the transparent film of the said composite. The transparent film has angular photochromic performance, that is, it can reflect light of some wavelength selectively depending on the view angle. The present invention may be used as anti-fake material and decorative material widely.

Description

technical field [0001] The invention relates to a composition with photochromic effect, in particular to a composition composed of modified cellulose and polymerizable monomers and a preparation method thereof. Background technique [0002] With the increasing development of the commodity economy, the anti-counterfeiting technology of commodities has attracted people's attention. Materials capable of producing photochromic effects have therefore been developed rapidly and are widely used in the fields of anti-counterfeiting materials and decorative materials. [0003] The photochromic effect of the material can be obtained by forming an intermittent layered structure of the material, such as thin layers obtained by coextrusion of alternating metal and ceramic sheets (Dobrowolski, J.A.; Ho, F.C. and Waldorf, A. , Applied Optics, 1989, 28, P14). But this kind of material is expensive, practical and inconvenient and not suitable for recycling. In addition, some cholesteric l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/02
Inventor 徐良衡林海霞宋立君董兰新赵俊
Owner SHANGHAI TECHSUN RFID TECHNOLGOY
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