阅读说明：本技术 一种防拍纸张材料及其制备方法 (Anti-patting paper material and preparation method thereof ) 是由 康望才 于 2020-05-18 设计创作，主要内容包括：本发明公开了一种防拍纸张材料及其制备方法,所述防拍纸张材料,包括基纸和涂布在基纸表面的防伪涂料,所述防伪涂料由基层、曝光变色层和可见层组成。本发明提供的防拍纸张材料通过纸张表面印制多层的结构,实现在紫外区、可见光区和红外光区的多波段防拍照、防复印效果。(The invention discloses an anti-beating paper material and a preparation method thereof. The anti-shooting paper material provided by the invention realizes the multi-band anti-shooting and anti-copying effects in an ultraviolet region, a visible light region and an infrared region by printing a multi-layer structure on the surface of paper.)

1. An anti-beating paper material is characterized by comprising base paper and anti-counterfeiting coating coated on the surface of the base paper,

the anti-counterfeiting coating consists of a base layer, an exposure color-changing layer and a visible layer;

wherein the base layer is prepared from the following raw materials in parts by weight: 10-20 parts of calcium carbonate, 10-20 parts of polyurethane resin, 1-10 parts of silicon dioxide, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane;

the color-changing layer is composed of the following raw materials in parts by weight: 1-10 parts of photo-reversible color-changing substance, 1-10 parts of cadmium dithizone, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane.

2. The anti-patting paper material according to claim 1, wherein the visible layer is composed of the following raw materials in parts by weight: 1-10 parts of titanium dioxide, 1-10 parts of p-phenylenediamine, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate, 1-5 parts of aminoethyl piperazine and 0.5-2 parts of polydimethylsiloxane.

3. The anti-patting paper material according to claim 1, wherein the photo-reversible coloring substance is a mixture of spiro (indoline) naphthopyran and spirofuran in a mass ratio of 1: 3.

4. The preparation method of the anti-beating paper material is characterized by comprising the following specific steps of:

step 1) preparation of a base layer: dispersing 10-20 parts of calcium carbonate, 10-20 parts of polyurethane resin, 1-10 parts of silicon dioxide, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane in a solvent, performing ball milling to obtain a dispersion liquid, heating to 100-200 ℃, further dispersing for 1-10 min, and removing the solvent to obtain a base coating; coating the obtained base layer coating on the surface of base paper, and drying to obtain a paper material with a base layer;

step 2) preparation of a color-changing layer: under a dark environment, oscillating, shearing and dispersing 1-10 parts of a photo-reversible color-changing substance, 1-10 parts of cadmium dithizone, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane in a solvent on an oscillator at 60-100 ℃ for 30-60 min to fully wet and disperse solid materials by liquid materials to obtain a color-changing layer coating; printing the obtained color-changing layer coating on the surface of the paper material with the base layer obtained in the step 1), and drying at 70-90 ℃ in vacuum to obtain a paper material with a two-layer structure; the printing pressure is 0.3-0.4 Pa, and the printing speed is 60-80 m/min;

step 3) preparation of an exposed layer: uniformly mixing 1-10 parts of titanium dioxide, 1-10 parts of p-phenylenediamine, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate, 1-5 parts of aminoethyl piperazine and 0.5-2 parts of polydimethylsiloxane at a high speed of 8000-15000 r/min to obtain a visible layer coating; coating a visible layer coating on the surface of the paper material obtained in the step 2) by using a non-setting adhesive coating machine, and drying at 90-100 ℃ to obtain the anti-shooting paper material.

5. The method for producing a slap-proof paper material according to claim 4 wherein the solvent is selected from water, glycerin or ethylene glycol.

6. The method for producing a slap-proof paper material according to claim 4, wherein the thickness of the base layer is 250 to 600 nm; the thickness of the exposure layer is 2-8 mu m; the thickness of the visible layer is 0.3-1.5 microns.

7. The method for producing a slap-proof paper material according to claim 4, wherein the wet coating amount of the offset coating is 1 to 5g/m²The thickness is 2-4 μm; the temperature in the coating process is 25-45 ℃, the composite pressure is 0.3-0.6 Pa, the leveling time is controlled within 15s, and the speed is 15-60 m/min.

8. Use of the anti-copy sheet material of any one of claims 1 to 7 in the preparation of a material for photo and copy protection.

Technical Field

The invention relates to the technical field of anti-counterfeiting, in particular to an anti-patting paper material and a preparation method thereof.

Background

In recent years, with rapid development of science and technology, people pay more and more attention to technical protection, and the requirements on anti-counterfeiting technologies such as anti-copying and anti-photographing of paper recording technical contents are also higher and higher. The anti-fake technology based on ink is mainly to add anti-fake material with special performance into ink vehicle and to produce special printing ink through special technological process. The mask has the characteristics of simple preparation, low cost, good concealment and the like. The existing anti-counterfeiting ink is mainly embodied as temperature-change anti-counterfeiting ink, cannot be used for anti-counterfeiting in secret disclosure technologies such as paper copying and photographing, and has limitations.

Therefore, a need exists for an anti-flap paper material that meets the needs of people.

Chinese patent with application number CN201510316019.1 discloses an anti-counterfeiting paper, including paper body and the anti-counterfeiting material of load on the paper body, anti-counterfeiting material includes the fibre on the fibre, be interval distribution along fibrous length direction and have two at least photosensitive granules that change colour, the anti-counterfeiting material in this anti-counterfeiting paper has the structure different with ordinary anti-counterfeiting fiber material, distinguishes easily, is difficult to imitate, and only needs single anti-counterfeiting ink just can have fine easy discernment nature. However, the prior art has no effect on how to realize secret leakage measures such as copying prevention, candid photograph prevention and the like, and has certain limitation.

Therefore, it is necessary to provide an anti-counterfeit paper material and a preparation method thereof to solve the problem that the existing anti-counterfeit paper is not strictly controlled in security leakage means such as copy prevention and candid photograph prevention.

Disclosure of Invention

The invention aims to provide an anti-shooting paper material and a preparation method thereof.

In order to solve the technical problems, the invention adopts the following technical scheme:

an anti-beating paper material comprises base paper and anti-counterfeiting coating coated on the surface of the base paper,

the anti-counterfeiting coating consists of a base layer, an exposure color-changing layer and a visible layer;

wherein the base layer is prepared from the following raw materials in parts by weight: 10-20 parts of calcium carbonate, 10-20 parts of polyurethane resin, 1-10 parts of silicon dioxide, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane;

the color-changing layer is composed of the following raw materials in parts by weight: 1-10 parts of a photo-reversible color-changing substance, 1-10 parts of cadmium dithizone, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane;

the visible layer is composed of the following raw materials in parts by weight: 1-10 parts of titanium dioxide, 1-10 parts of p-phenylenediamine, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate, 1-5 parts of aminoethyl piperazine and 0.5-2 parts of polydimethylsiloxane.

Furthermore, the photo-reversible color-changing substance is a mixture of spiro (indoline) naphthopyran and spiro furan according to the mass ratio of 1:3, the combination of the spiro (indoline) naphthopyran and the spiro furan can avoid the problem that the spiro furan is unstable to heat and fails in color development, and the color development is more sensitive. Cadmium dithizone was prepared as follows: dissolving dithizone in tetrahydrofuran, dissolving cadmium-containing inorganic salt in water, mixing the dithizone solution with the cadmium-containing inorganic salt solution, refluxing, adding water for precipitation, filtering, and heating and drying the solid in a crucible to obtain the cadmium dithizone.

On the other hand, the invention provides a preparation method of an anti-beating paper material, which comprises the following specific steps:

step 1) preparation of a base layer: dispersing 10-20 parts of calcium carbonate, 10-20 parts of polyurethane resin, 1-10 parts of silicon dioxide, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane in a solvent, performing ball milling to obtain a dispersion liquid, heating to 100-200 ℃, further dispersing for 1-10 min, and removing the solvent to obtain a base coating; coating the obtained base layer coating on the surface of base paper, and drying to obtain a paper material with a base layer; the base layer can absorb a near infrared spectrum, the spectrum is in the range of 500-1000 nm, and the thickness of the base layer is 250-600 nm;

step 2) preparation of a color-changing layer: under a dark environment, oscillating, shearing and dispersing 1-10 parts of a photo-reversible color-changing substance, 1-10 parts of cadmium dithizone, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate and 0.5-2 parts of polydimethylsiloxane in a solvent on an oscillator at 60-100 ℃ for 30-60 min to fully wet and disperse solid materials by liquid materials to obtain a color-changing layer coating; printing the obtained color-changing layer coating on the surface of the paper material with the base layer obtained in the step 1), and drying at 70-90 ℃ in vacuum to obtain a paper material with a two-layer structure; the printing pressure is 0.3-0.4 Pa, and the printing speed is 60-80 m/min; under the irradiation of ultraviolet light (220-400 nm), the distance between a ring body and an oxygen atom is closer, so that the interaction of an electron cloud is changed, the color of the electron cloud is darker (such as orange red or purple red), the color of the electron cloud is recovered to be colorless under the irradiation of no ultraviolet light, and the image-text information of an original document is shielded after the color is changed; the cadmium dithizone can absorb visible light with the wavelength of 400-700 nm, and the visible light is absorbed to become dark under the irradiation of strong light, so that the image and text information of the original document is shielded, and the document is prevented from being copied or photographed; the thickness of the exposure layer is 2-8 μm;

step 3) preparation of an exposed layer: uniformly mixing 1-10 parts of titanium dioxide, 1-10 parts of p-phenylenediamine, 5-10 parts of isooctyl sebacate, 0.5-2 parts of sodium dodecyl sulfate, 1-5 parts of aminoethyl piperazine and 0.5-2 parts of polydimethylsiloxane at a high speed of 8000-15000 r/min to obtain a visible layer coating; coating a visible layer coating on the surface of the paper material obtained in the step 2) by using a non-setting adhesive coating machine, and drying at 90-100 ℃ to obtain the anti-shooting paper material. The thickness of the visible layer is 0.3-1.5 microns, p-phenylenediamine can emit visible light under the excitation of ultraviolet (220-400 nm) or infrared light (715-1100 nm), and the visible light is developed through exposure to prevent photographing and copying; titanium dioxide is a material with a high refractive index, and can reflect part of the light for photographing or copying to cause an exposure phenomenon.

Further, the solvent is selected from water, glycerol or ethylene glycol.

Further, the wet coating amount of the offset coating is 1-5 g/m²The thickness is 2-4 μm; coating compositionThe temperature in the cloth process is 25-45 ℃, the composite pressure is 0.3-0.6 Pa, the leveling time is controlled within 15s, and the speed is 15-60 m/min.

Ultraviolet light, infrared light or intense light is carried out by using a scanner or a plurality of light sources, wherein the plurality of light sources can be a photodiode array, a flash lamp and the like;

the reaction of the luminescent substance of the material under special conditions such as ultraviolet and infrared is used as a proof, and the disclosed components and proportion enable the material to have the performances such as color change, and the effect is lost after the components and the proportion are changed. The light emitting substance is excited by strong light of copying machine or mobile phone, and then the absorbed light energy is stored by electron capture, and when the light emitting substance is excited by certain ultraviolet light or infrared light, the stored energy is released by the electrons to form a black image.

The reaction of the luminescent substances of the material under special conditions such as strong light is used as a proof, and the disclosed components and proportion enable the material to have the properties of light reflection and the like, so that the effect is lost after the components and the proportion are changed. The luminous material is excited by the strong light of copying machine or mobile phone and the light energy is reflected out to produce strong visual difference and form strong white light with obvious anti-fake effect.

Compared with the prior art, the invention has the following beneficial effects:

(1) the anti-shooting paper material prepared by the invention realizes the multi-band anti-shooting and anti-copying effects in an ultraviolet region, a visible light region and an infrared region through a multi-layer structure on the surface of paper. Under the dual action of the exposure layer and the color development layer, characters recorded on the anti-shooting paper material become fuzzy, and the anti-shooting and anti-copying effects are achieved.

(2) The preparation method provided by the invention has the advantages of simple process flow and low operation cost, and the prepared anti-shooting paper material has multiband anti-shooting and anti-copying effects and can realize the purposes of anti-shooting and anti-copying;

(3) the coating in the anti-shooting paper material directly covers the surface of the paper, has extremely high secrecy, cannot be distinguished by naked eyes and hand touch, and can be found by strong light, ultraviolet or infrared radiation when the authenticity is identified. The technology is invisible and difficult to find, and meanwhile, when characters recorded on paper are photographed or copied, the paper is darkened or brightened according to different light selected by a user, so that the characters are covered by black images or surrounded by white light, the characters which are secretly photographed or copied are not clear, and the effect of preventing the characters from being secretly photographed or copied is achieved.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention.