Visible nanometer anti-counterfeit label

[0029] Example 1

[0030] Such as figure 1 As shown, a nano anti-counterfeiting label that is visible to the naked eye can directly visualize the anti-counterfeiting confirmation mark with the naked eye. The label includes a composite refractive lens layer (1), a focal length layer (2) and an image mode layer (3). The composite refraction lens layer (1) is connected to the focal length layer (2), and the focal length layer is connected to the image mode layer (3); the lenses of the composite refraction lens layer (1) are arranged crosswise by gratings and have a surface plane The treatment coating composition, the lens is a quadrangular lens; the image mode layer (3) is composed of nanoparticles, and the image mode layer (3) is a 3D structure composed of the nanoparticles, and the 3D structure is Letters; the nanoparticles are particles with a core and shell structure, the shell is made of silica material; the diameter of the core is 15nm, the thickness of the shell is 8nm; the voids of the nanoparticles are filled There is epoxy resin.

[0031] The method and function of filling epoxy resin in the voids of the above-mentioned nanoparticles are as follows: the core is made of gold particles with a diameter of 15nm, and then the gold particles are coated with silica to form composite particles (Au@SiO 2 ). This kind of composite nano-particles with core and shell structure get ordered Au@SiO after natural sedimentation 2 Photonic crystals. Take Au@SiO 2 The photonic crystal is used as the template. Epoxy is filled in the voids, and then the silica in the template is removed with hydrofluoric acid to obtain epoxy nanoparticles. The gold nanoparticles in the template are "released" and remain in the epoxy. In the voids of the resin film, such a system has the following advantages: metal nanoparticles have an important influence on the optical properties of photonic crystals; the interconnected macropores in the polymer film allow ions or macromolecules to diffuse freely, while gold particles can Get in full contact with it.

[0032] The method for preparing nanoparticles in the image mode layer (3) includes the following steps:

[0033] a. Gold nanoparticles with a diameter of 15nm are coated with a silica shell layer with a thickness of 8nm to prepare Au@SiO 2 Composite nanoparticles;

[0034] b. The Au@SiO obtained in step a 2 The composite nano particles and polystyrene particles with a diameter of 640 nm are uniformly mixed to prepare a colloid. The Au@SiO 2 The particles are filled in the voids between the polystyrene particles;

[0035] c. Remove polystyrene particles by calcining the colloid prepared in step b at 500°C, while also making adjacent Au@SiO 2 Sintering of the silica shell of the particles to obtain Au@SiO with stable structure 2 Macroporous membrane, the wall structure of the membrane is composed of closely packed Au@SiO 2 The composite nano-particles constitute the nano-particles in the image mode layer (3).

[0036] The nano anti-counterfeiting label visible to the naked eye is applied as follows: the nano particles are added to the transparent glue, and the nano particles can be combined to form letters, and then processed into a sheet. The product trademark can be printed on the sheet. You can see the pre-designed letters.

[0037] Example 2

[0038] Such as figure 1 As shown, a nano anti-counterfeiting label visible to the naked eye can directly visualize the anti-counterfeiting confirmation mark with the naked eye. The label includes a composite refractive lens layer (1), a focal length layer (2), and an image mode layer (3). The compound refraction lens layer (1) is connected to the focal length layer (2), and the focal length layer is connected to the image mode layer (3); the lenses of the compound refraction lens layer (1) are arranged crosswise by gratings and surface The composition of the plane treatment coating, the lens is a quadrangular lens; the image mode layer (3) is composed of nanoparticles, and the image mode layer (3) is a 3D structure composed of the nanoparticles, and the 3D structure Is a symbol; the nanoparticle is a particle with a core and a shell structure, the shell is made of silica material; the diameter of the core is 15nm, the thickness of the shell is 28nm; in the voids of the nanoparticle Filled with epoxy resin.

[0039] The method and function of filling epoxy resin in the voids of the above-mentioned nanoparticles are as follows: the core is made of gold particles with a diameter of 15nm, and then the gold particles are coated with silica to form composite particles (Au@SiO 2 ). This kind of composite nano-particles with core and shell structure get ordered Au@SiO after natural sedimentation 2 Photonic crystals. Take Au@SiO 2 The photonic crystal is used as the template. Epoxy is filled in the voids, and then the silica in the template is removed with hydrofluoric acid to obtain epoxy nanoparticles. The gold nanoparticles in the template are "released" and remain in the epoxy. In the voids of the resin film, such a system has the following advantages: metal nanoparticles have an important influence on the optical properties of photonic crystals; the interconnected macropores in the polymer film allow ions or macromolecules to diffuse freely, while gold particles can Get in full contact with it.

[0040] The method for preparing nanoparticles in the image mode layer (3) includes the following steps:

[0041] a. Gold nanoparticles with a diameter of 15nm are coated with a silica shell layer with a thickness of 28nm to prepare Au@SiO 2 Composite nanoparticles;

[0042] b. The Au@SiO obtained in step a 2 The composite nano particles and polystyrene particles with a diameter of 640 nm are uniformly mixed to prepare a colloid. The Au@SiO 2 The particles are filled in the voids between the polystyrene particles;

[0043] c. Remove polystyrene particles by calcining the colloid prepared in step b at 500°C, while also making adjacent Au@SiO 2 Sintering of the silica shell of the particles to obtain Au@SiO with stable structure 2 Macroporous membrane, the wall structure of the membrane is composed of closely packed Au@SiO 2 The composite nano-particles constitute the nano-particles in the image mode layer (3).

[0044] The application of the naked eye-visible nano anti-counterfeiting label is as follows: the nano particles are directly printed on the product, and different arrangements and combinations of the nano particles use optical principles to see different letters at different angles.

[0045] Example 3

[0046] Such as figure 1 As shown, a nano anti-counterfeiting label visible to the naked eye can directly visualize the anti-counterfeiting confirmation mark with the naked eye. The label includes a composite refractive lens layer (1), a focal length layer (2), and an image mode layer (3). The compound refraction lens layer (1) is connected to the focal length layer (2), and the focal length layer is connected to the image mode layer (3); the lenses of the compound refraction lens layer (1) are arranged crosswise by gratings and surface The composition of the plane treatment coating, the lens is a quadrangular lens; the image mode layer (3) is composed of nanoparticles, and the image mode layer (3) is a 3D structure composed of the nanoparticles, and the 3D structure Is a sign; the nanoparticle is a particle with a core and shell structure, the shell is made of silica material; the diameter of the core is 15nm, the thickness of the shell is 20nm; the voids of the nanoparticle Filled with epoxy resin.

[0047] The method and function of filling epoxy resin in the voids of the above-mentioned nanoparticles are as follows: the core is made of gold particles with a diameter of 15nm, and then the gold particles are coated with silica to form composite particles (Au@SiO 2 ). This kind of composite nano-particles with core and shell structure get ordered Au@SiO after natural sedimentation 2 Photonic crystals. Take Au@SiO 2 The photonic crystal is used as the template. Epoxy is filled in the voids, and then the silica in the template is removed with hydrofluoric acid to obtain epoxy nanoparticles. The gold nanoparticles in the template are "released" and remain in the epoxy. In the voids of the resin film, such a system has the following advantages: metal nanoparticles have an important influence on the optical properties of photonic crystals; the interconnected macropores in the polymer film allow ions or macromolecules to diffuse freely, while gold particles can Get in full contact with it.

[0048] The method for preparing nanoparticles in the image mode layer (3) includes the following steps:

[0049] a. Gold nanoparticles with a diameter of 15nm are coated with a silica shell layer with a thickness of 20nm to prepare Au@SiO 2 Composite nanoparticles;

[0050] b. The Au@SiO obtained in step a 2 The composite nano particles and polystyrene particles with a diameter of 640 nm are uniformly mixed to prepare a colloid. The Au@SiO 2 The particles are filled in the voids between the polystyrene particles;

[0051] c. Remove polystyrene particles by calcining the colloid prepared in step b at 500°C, while also making adjacent Au@SiO 2 Sintering of the silica shell of the particles to obtain Au@SiO with stable structure 2 Macroporous membrane, the wall structure of the membrane is composed of closely packed Au@SiO 2 The composite nano-particles constitute the nano-particles in the image mode layer (3).

[0052] The application of the nano anti-counterfeiting label visible to the naked eye is as follows: the nano particles are added to the transparent glue, and the nano particles can be combined to find different signs, and then processed into a thin sheet. The product trademark can be printed on the sheet, and the trademark The pre-designed logo can be seen with the naked eye.