CN210101099U

CN210101099U - Thermochromic anti-counterfeiting paper

Info

Publication number: CN210101099U
Application number: CN201920726281.7U
Authority: CN
Inventors: 杨泽芳; 陶璟琦; 季书林
Original assignee: Bank Of Nanjing New Mstar Technology Ltd
Current assignee: Bank Of Nanjing New Mstar Technology Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-02-21
Anticipated expiration: 2029-05-21

Abstract

The utility model discloses a thermochromism anti-counterfeit paper, including the paper basement paper the paper basement upper surface sets up thermochromism display object layer, lay the metal nano wire film on the thermochromism display object layer lay a pair of line electrode on a set of side that the metal nano wire film is relative the paper basement back is equipped with the power, the line electrode passes through electrode pin-connected the power. The metal nanowire film is used as the heater, has high optical transmittance and ultralow resistance value, has a stealth function on paper, can be positioned on the same side of the paper as a thermochromic display object, directly and quickly transfers heat to the thermochromic material, and does not shield the display object.

Description

Thermochromic anti-counterfeiting paper

Technical Field

The utility model relates to a thermochromism anti-counterfeit paper.

Background

The paper electronics is a subject field which is widely researched and developed in recent years, and intelligent functions such as paper display, signal transmission, energy storage, sensing detection and the like are realized through manufacturing of elements such as resistors, capacitors and the like on paper. The paper-based heater is one kind of intelligent paper, and is a device for temperature regulation and control by manufacturing a layer of conductive film on paper and utilizing joule heat effect generated by electrifying a resistive film; the thermochromic technology is just a technology for regulating and controlling the optical characteristics of a color-changing material by depending on temperature change, so that the display objects (characters, pictures, colors and the like) can be changed from existence to nonexistence or from nonexistence to existence, or from one object to another object or even multiple objects, and the intelligent electrically-heated color-changing paper integrating the paper-based heater and the thermochromic display objects can be applied to the fields of digital display, intelligent pattern display, temperature indication and control, stress indication and the like. The problem that the temperature change is slow and the power consumption is large in the application of the existing paper-based heater is that the conductive film of the heater is generally an opaque metal film, so that a thermochromic display object on the upper surface of paper is not shielded, the conductive film can only be manufactured on the lower surface of the paper, and the phenomenon that the internal heat transfer is slow and the temperature of the upper surface is lower than that of the heating film due to the small heat conductivity coefficient and the large specific heat capacity of the paper is caused.

Disclosure of Invention

The purpose of the invention is as follows: in view of the above prior art, a thermochromic anti-counterfeit paper is provided, in which a heater directly and rapidly transfers heat to a thermochromic material without shielding a display object.

The technical scheme is as follows: a thermochromic anti-counterfeiting paper comprises a paper substrate, wherein a thermochromic display object layer is arranged on the upper surface of the paper substrate, a metal nanowire film is arranged on the thermochromic display object layer, a pair of line electrodes are arranged on one group of opposite side edges of the metal nanowire film, a power supply is arranged on the back surface of the paper substrate, and the line electrodes are connected with the power supply through electrode leads.

Furthermore, the thermochromic display object layer comprises a plurality of layers of display objects with different thermochromic temperatures, a plurality of electric connection points are arranged on the wire electrode at intervals along the length, and the power supply is a plurality of button batteries fixed on the back of the paper base; the electrode lead is connected with the electric connection point and the button cell, each button cell and the line electrode are connected in series to form a plurality of parallel power supply branches, and each power supply branch is provided with a switch.

Furthermore, the metal nanowires in the metal nanowire film are one or a mixture of gold nanowires, silver nanowires, copper nanowires, nickel nanowires and alloy nanowires, wherein the diameter of the metal nanowires is 10-100 nm, and the ratio of the length to the diameter of the metal nanowires is 100-5000.

Further, the thickness of the line electrode is 0.001-0.1 mm, and the line width is 0.1-3 mm; the line width of the electrode lead is 0.1-3 mm.

Furthermore, the square resistance of the metal nanowire film is 10-100 omega.

Has the advantages that: the utility model discloses a thermochromism anti-counterfeit paper adopts metal nanowire film as the heater, and metal nanowire film has high optical transmittance, ultralow resistance value, has "stealthy" function on the paper, can be located same one side of paper with thermochromism display object, and direct quick transmission heat gives thermochromism material, does not shelter from the display object again. The utility model discloses an anti-counterfeit paper does not rely on the paper type, but all kinds of paper among the make full use of industrial production, the low-cost extensive popularization of being convenient for. The anti-counterfeiting paper has various thermochromic combinations and strong imitation resistance, and simultaneously adopts active color change, is little influenced by environmental fluctuation and has reliable anti-counterfeiting performance.

Drawings

FIG. 1 is a schematic structural diagram of a thermochromic security paper;

FIG. 2 is a graph showing the results of dynamic repeated reflectance tests.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, a thermochromic anti-counterfeit paper includes a paper substrate 5, a thermochromic display object layer 4 is disposed on an upper surface of the paper substrate 5, a metal nanowire film 3 is disposed on the thermochromic display object layer 4, a pair of wire electrodes 2 is disposed on a set of opposite side edges of the metal nanowire film 3, a power supply is disposed on a back surface of the paper substrate 5, and the wire electrodes 2 are connected to the power supply through electrode leads 7. The metal nanowires in the metal nanowire film 3 are one or a mixture of gold nanowires, silver nanowires, copper nanowires, nickel nanowires and alloy nanowires of which the diameter is 10-100 nm and the ratio of the length to the diameter is 100-5000, and the sheet resistance of the metal nanowire film 3 is 10-100 omega. The thickness of the line electrode 2 is 0.001-0.1 mm, and the line width is 0.1-3 mm; the line width of the electrode lead 7 is 0.1-3 mm.

When the thermochromic display object layer 4 comprises a plurality of layers of display objects with different thermochromic temperatures, three electrical connection points 1 are arranged on the wire electrode 2 at intervals along the length, and the power supply 8 is three button batteries 8 fixed on the back of the paper substrate 5. A group of electric connection points 1 is connected with a button cell 8 in series through an electrode lead 7, the button cell 8 and the line electrode 2 are connected into three parallel power supply branches through the three electrode leads 7, and a switch 6 is arranged on each power supply branch.

The utility model discloses a thermochromism anti-counterfeit paper, thermochromism show object layer 4 can be through inkjet printing, silk screen printing or other industrialization printing technology, with demonstration objects preparation such as characters, picture, color on paper basement surface. When the thermochromic display object layer 4 comprises a plurality of layers of display objects, the layers are printed layer by layer. The thermochromic temperature of each layer is different; the color change behavior is different, such as from present to absent or from absent to present; the transformation objects are different, such as appearance or disappearance of characters and pictures, color transformation and the like. The metal nanowire film 3 is paved on the whole paper substrate 5 in a coating mode such as spraying, blade coating and the like. The wire electrode 2 is made of gold, silver, copper using one or more of evaporation, sputtering, conductive adhesive methods. The electrode leads 7 are bent along the side edges of the paper when crossing the back of the paper and are connected to the electrical connection points 1, and the electrode leads 7 and the button cells 8 are fixed on the back of the paper substrate 5 through conductive glue. A switch button is arranged in the middle of the electrode lead 7, the electrode lead is connected with two poles of the button cell by pressing the switch button, and the cell outputs current outwards.

By designing a display object which is changed from red to colorless after being heated on the paper substrate 5, the switch 6 is pressed, the paper substrate 5 is heated, and after the thermochromic transition temperature is reached, the color of the thermochromic display object is changed from red to colorless and disappears. After the switch 6 is turned off, the temperature of the paper substrate 5 drops below the thermochromic transition temperature, the thermochromic display object reappears in red, and this anti-counterfeiting change can be repeatedly achieved, with the reaction rate of the single-layer thermochromic display object layer as shown in fig. 2. More importantly, the utility model discloses a thermochromism anti-fake paper, thermochromism show object layer and zone of heating in same one side of paper, and heat transfer is effective and quick, shows by the dynamic test of fig. 2, and anti-fake differentiates only need tens seconds time can.

In this embodiment, if all the switches 6 are pressed simultaneously, the button cells output current to the metal nanowire films in parallel, the heating temperature of the corresponding metal nanowire film 3 reaches the highest color change temperature of the thermochromic display object layer 4, and when one switch 6 is turned off, the heating temperature of the metal nanowire film 3 reaches the next highest color change temperature of the thermochromic layer, and so on, that is, the number of button cell groups is equal to the number of thermochromic layers.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The thermochromic anti-counterfeiting paper is characterized by comprising a paper substrate (5), wherein a thermochromic display object layer (4) is arranged on the upper surface of the paper substrate (5), a metal nanowire film (3) is arranged on the thermochromic display object layer (4), a pair of line electrodes (2) are arranged on one group of opposite side edges of the metal nanowire film (3), a power supply is arranged on the back surface of the paper substrate (5), and the line electrodes (2) are connected with the power supply through electrode leads (7).

2. The thermochromic anti-counterfeiting paper according to claim 1, wherein the thermochromic display object layer (4) comprises a plurality of layers of display objects with different thermochromic temperatures, a plurality of electrical connection points (1) are arranged on the wire electrode (2) at intervals along the length, and the power supply (8) is a plurality of button cells (8) fixed on the back surface of the paper substrate (5); the electrode lead (7) is connected with the electric connection point (1) and the button batteries (8), each button battery (8) and the line electrode (2) are connected in series to form a plurality of parallel power supply branches, and each power supply branch is provided with a switch (6).

3. The thermochromic security paper as claimed in claim 1 or 2, wherein the metal nanowires in the metal nanowire film (3) are one or more of gold, silver, copper, nickel and alloy nanowires with a diameter of 10-100 nm and a length-to-diameter ratio of 100-5000.

4. The thermochromic security paper according to claim 1 or 2, wherein the wire electrode (2) has a thickness of 0.001 to 0.1mm and a line width of 0.1 to 3 mm; the line width of the electrode lead (7) is 0.1-3 mm.

5. The thermochromic security paper as claimed in claim 3, wherein the sheet resistance of the metal nanowire thin film (3) is 10 to 100 Ω.