Optical color variable pigment with near-infrared transmission feature and preparation process thereof

A color-changing pigment, infrared transmission technology, applied in the direction of pigment paste, etc., can solve the problem of lack of infrared transmission ability, etc., to achieve the effect of improving anti-counterfeiting ability and inspection efficiency

Inactive Publication Date: 2005-11-30
SHANGHAI BANKNOTE PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it can be said that the optically variable pigments used in the e

Method used

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  • Optical color variable pigment with near-infrared transmission feature and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation of meltable liquid crystal polymer: 65g 2-hydroxyl-6-naphthoic acid, 130g p-hydroxybenzoic acid, 62g 4,4'-dihydroxybiphenyl, 70g (+)-camphoric acid and 210g acetic anhydride in proportion Added to the reactor, flushed with nitrogen flow. The mixture was rapidly heated to 140°C and held at this temperature for 30 minutes. The temperature was then raised to 320°C and the melt was held at this temperature for 15 minutes. From about 220°C, acetic acid starts to evaporate. The nitrogen flush was then stopped and vacuum was applied. The melt was stirred for 30 minutes under reduced pressure (approximately 5 mbar). The product was placed in a nitrogen atmosphere and cooled to room temperature to obtain a meltable polymer liquid crystal.

Embodiment 2

[0017] Preparation of a mixture containing energy-polymerizable liquid crystal monomers:

[0018] 1. Nematic liquid crystal monomer 75g:

[0019]

[0020] 2. Monomer with chiral structure: cholesteryl acrylate 28g

[0021] 3. Photoinitiator 907 (from Ciba) 5g

[0022] B, Heliogen Blue L 7080 (from BASF company) 4g

[0023] C. Everlasting Red FBB (from Lily Chemical) 6g

[0024] D. Everlasting Yellow HR02 (from Baihe Chemical Industry) 3g

[0025] E. Chloroform 15g

[0026] Put the above 8 kinds of compounds into the planetary mixer according to the corresponding proportion, and carry out high-speed stirring and mixing to obtain a monomer mixture capable of energy polymerization.

Embodiment 3

[0028] 8.5 g of the meltable polymer liquid crystal produced in Example 1 and 1.5 g of HeliogenBlue L 6975F (from BASF) were mixed and extruded in a twin-screw extruder at 230° C. Put the extruded material into the granulator, carry out coarse crushing, and crush it into a particle size of about 2mm. Then the coarsely pulverized product is added to a jet mill for ultrafine pulverization to obtain a pigment with a particle size of about 15 microns. The pigment has a distinct golden-green luster under vertical observation.

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Abstract

The invention discloses a phototropic colourant having a near-infrared penetrance property and the preparation technology, using the near-infrared penetrance material of a weight ratio of 1-30 percent, and polymer liquid crystal material of a weight ratio of 70-99 percent, to make it have both phototropic and infrared transmission characteristic. Innovation of false proof of the colourant is characterized in that combining the present liquid crystal optically variable false proof with infrared transmission to make the colourant having both phototropic false proof characteristic and infrared transmission, highly increasing the false proof ability and check efficiency, it satisfies the popular primary line false proof, and the machine readable second line false proof. The colourant can apply in false proof productions in many forms. Especially in the form of ink, it can apply in the fields of currency, certification, documentary security, commodity packaging and so on.

Description

technical field [0001] The invention relates to a safe and anti-counterfeiting pigment, in particular to an optical color-changing pigment with infrared light transmission function. Background technique [0002] In the prior art, we prepare optically variable pigments (OVP) used in the security field by using physical or chemical stacking methods. The security products using this pigment can change different colors when observed from different angles, and the color changing effect is very strong. It is the first choice for anti-counterfeiting pigments for high security products such as currency and certificates. US4705300, US5135812, US5278590, US5084351 and other relevant documents describe the optical color-changing pigments prepared by the physical steam method and the methods of their application. The pigment prepared by this method has strong absorption and reflection ability to infrared light, so it is not easy to be transmitted by infrared light. And those optical c...

Claims

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Application Information

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IPC IPC(8): C09D17/00
Inventor 金劼张世范花颖张蔚恒李晓平
Owner SHANGHAI BANKNOTE PRINTING
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