Preparation method of responsive structural color optically variable anti-counterfeiting coating

Abstract

The invention relates to a preparation method of a responsive structural color optically variable anti-counterfeiting coating, which comprises the following steps of: preparing 100ml of a SiO2 microsphere aqueous dispersion with the mass fraction of 10-15% and the diameter of 150-220nm, adding 0.3-0.8 mg of carbon quantum dot powder and 0.1-0.4 mg of a photochromic polymer into the aqueous dispersion, magnetically and stirring at room temperature for 10-20 minutes for and sufficient mixing to obtain uniformly dispersed dispersion liquid to be sprayed; constructing a structural color pattern ona substrate by using a method of spraying nanoparticles on a mask; and then plating a metal film on the surface of the constructed structural color pattern. By adding the carbon quantum dots into thespraying dispersion liquid, the color change range of the obtained anti-counterfeiting coating is wider, and recovery is faster; and spiropyrane is positioned in a cross-linked structure of polyesteras a color-changing compound, and the unique structure can enable spiropyrane to be protected by polyester with relatively stable properties, so that the color-changing compound is prevented from being influenced by an external environment, the spectral response is more sensitive, and the color-changing effect is good.

Description

technical field [0001] The invention relates to a preparation method of an optically variable anti-counterfeiting coating with responsive structural color. Background technique [0002] Structural color materials have shown unique advantages in many fields, so structural color materials have great application potential in the field of photonics, pigments, fiber "coloring", sensing, photocatalysis, and energy conversion materials. The organic combination of the responsiveness of the photonic crystal and the optical performance of the structural color can obtain a variety of functional photonic crystal structures. [0003] Photochromism refers to certain compounds under the action of light of a certain wavelength and intensity, as the absorption spectrum changes, the molecular structure of the material changes, resulting in changes in the absorbance and color of the material. Disadvantages such as poor light stability, low photochromic response value, and insufficient thermal...

AI Technical Summary

Problems solved by technology

Disadvantages such as poor light stability, low photochromic response value, and insufficient thermal stability of color-changing compounds, such as: photochromic compounds are easily affected by pH value, oxidation, light intensity, temperature, matrix environment, etc., resulting in photochemical fatigue Deterioration, and degradation and deterioration after repeated exposure to repeated irradiation and loss of reversible photochromic properties, or prolongation of discoloration response time, weakening of chromaticity, slow fading recovery time, etc.