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Photoreversible discoloration anti-counterfeiting paper and preparation method thereof

A technology of anti-counterfeiting paper and light-induced, which is applied in the direction of papermaking, textiles and papermaking, and the addition of paper forming additives. It can solve the problems of poor thermal stability and limit large-scale application, and achieve long storage period, easy industrial application, and simple operation. Effect

Active Publication Date: 2017-03-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor thermal stability of the ring-opening structure of spiropyran compounds, its large-scale application in the field of optoelectronic materials is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing photoreversible discoloration anti-counterfeiting paper, comprising the following steps:

[0026] (1) Take each raw material according to the following ratio: a pigment composed of 70 parts by mass of kaolin and 30 parts by mass of ground calcium carbonate (GCC), and the photoreversible discoloration substance chitosan spiropyril that accounts for 1% of the total mass of the pigment Furan graft copolymer, styrene-butadiene latex accounting for 15% of the total mass of the pigment, dispersant sodium hexametaphosphate accounting for 0.5% of the total mass of the pigment, oxidized starch accounting for 3% of the total mass of the pigment, and 0.2% of the defoaming agent accounting for the total mass of the pigment agent polyoxyethylene ether;

[0027] (2) Add the kaolin and ground calcium carbonate (GCC) weighed in step (1) into 100 parts by mass of water, then add the dispersant sodium hexametaphosphate and disperse at a high speed of 10000r / min for...

Embodiment 2

[0030] A method for preparing photoreversible discoloration anti-counterfeiting paper, comprising the following steps:

[0031] (1) Take each raw material according to the following ratio: a pigment composed of 70 parts by mass of kaolin and 30 parts by mass of ground calcium carbonate (GCC), and a photoreversible discoloration substance chitosan spiropyril that accounts for 2% of the total mass of the pigment Fran graft copolymer, styrene-butadiene latex accounting for 20% of the total mass of the pigment, dispersant sodium pyrophosphate accounting for 0.5% of the total mass of the pigment, and polyoxyethylene ether for defoaming agent accounting for 0.5% of the total mass of the pigment;

[0032] (2) Add the kaolin and ground calcium carbonate (GCC) weighed in step (1) into 100 parts by mass of water, then add the dispersant sodium pyrophosphate and disperse at a high speed of 15000r / min for 10min; then add half of polyoxyethylene Ether, stirred at 1500r / min for 2min; then a...

Embodiment 3

[0035] A method for preparing photoreversible discoloration anti-counterfeiting paper, comprising the following steps:

[0036] (1) Take each raw material according to the following ratio: a pigment composed of 60 parts by mass of kaolin and 40 parts by mass of ground calcium carbonate (GCC), and a photoreversible discoloration substance chitosan spiropyril that accounts for 2% of the total mass of the pigment Furan graft copolymer, styrene-butadiene latex accounting for 10% of the total mass of the pigment, dispersant sodium polyacrylate accounting for 0.2% of the total mass of the pigment, oxidized starch accounting for 5% of the total mass of the pigment and a defoamer accounting for 0.3% of the total mass of the pigment Polyoxyethylene ether;

[0037] (2) Add the kaolin and ground calcium carbonate (GCC) weighed in step (1) into 100 parts by mass of water, then add the dispersant sodium polyacrylate and disperse at a high speed of 8000r / min for 15min; then add half of poly...

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PUM

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Abstract

The invention belongs to the technical field of anti-counterfeit paper manufacturing, and particularly discloses reversible photochromic anti-counterfeit paper and a preparation method thereof. The reversible photochromic anti-counterfeit paper is composed of a reversible color-shifting coating and paper-base carrier materials, the reversible color-shifting coating is composed of paint including reversible photochromic substances, and the paper-base carrier materials are formed by one or two fibrous materials of bleached softwood or bleached broadleaf wood through perpermaking. The preparation method comprises the steps that the reversible photochromic substances are added into the paint to be made into the reversible photochromic paint; the surfaces of the paper-base carrier materials are coated with a reversible photochromic paint, a reversible photochromic coating is formed after drying is conducted, and the reversible photochromic anti-counterfeit paper is obtained. According to the reversible photochromic anti-counterfeit paper and the preparation method thereof, the reversible photochromic substances are added into the paint to be applied to anti-counterfeit paper, and the reversible photochromic anti-counterfeit paper and the preparation method thereof have the advantages of being fast in detection, good in thermal stability, long in retention cycle, good in reversibility of color change and strong in anti-counterfeit capacity.

Description

technical field [0001] The invention belongs to the technical field of anti-counterfeit paper manufacture, and in particular relates to a photoreversible color-reversible anti-counterfeit paper and a preparation method thereof. Background technique [0002] With the development of economy and society, the types and demand of special paper products are increasing, and the competition among commodities is becoming more and more fierce. In order to prevent unscrupulous competitors from imitating self-developed products, anti-counterfeiting technology is being used more and more to the development of new products. As far as the existing anti-counterfeiting technology is concerned, it can be divided into physical anti-counterfeiting, chemical anti-counterfeiting and biological anti-counterfeiting. Among them, the optical method in the physical method is widely used because of its simple operation. Among them, photochromic phenomenon is more common. Ultraviolet photochromic detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/38D21H19/40D21H21/06D21H19/58D21H19/54D21H21/12D21H21/40
Inventor 杨仁党华飞果杨飞王斌
Owner SOUTH CHINA UNIV OF TECH
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