Pigment coating capable of realizing full-color-gamut controllable self-discoloration and preparation process thereof

Abstract

The invention relates to the technical field of magnetic nano materials, in particular to a pigment coating capable of realizing full-color-gamut controllable self-discoloration and a preparation process of the pigment coating. Comprising a matrix layer, a functional layer and a magnetic control layer, and the functional layer comprises the following components in parts by weight: 100-300 parts of Fe3O4 coated SiO2 nanorods, 12-18 parts of nano-TiO2, 8-12 parts of Ag nanoparticles, 3-6 parts of titanium dioxide, 2-5 parts of a dispersing agent and 3-6 parts of a photoinitiator. By improving a pigment formula and a dispersion technology, the stability of the pigment in different environments is improved. By optimizing the nanostructure design, the view angle dependence is reduced, and the application prospects in the fields of automobiles, buildings and the like are improved. The problems that a traditional electrochromic technology is narrow in color gamut and high in energy consumption are solved.

Description

Technical Field

[0001] This invention relates to the field of magnetic nanomaterials technology, and more specifically, to a pigment coating capable of achieving full-gamut controllable self-color changing and its preparation process. Background Technology

[0002] Full-gamut controllable self-coloring pigment coatings are intelligent materials capable of changing color within a specific range in response to environmental stimuli (such as light, temperature, electromagnetic fields, etc.). Their technical principles are primarily based on optical interference, molecular structure changes, or material response mechanisms to achieve dynamic and reversible color changes.

[0003] Full-gamut controllable self-chromatic pigments typically employ a multi-layered nanofilm structure. By controlling the thickness and sequence of materials with different refractive indices, an interference effect on light is achieved. Photochromic pigments undergo structural changes under illumination with light of a specific wavelength, thereby altering their color.

[0004] The main technical bottlenecks and improvement directions currently facing full-gamut controllable self-color changing pigment coatings are as follows: Under long-term use or different environmental conditions, the pigment color is prone to subtle changes, affecting color consistency. Thermochromic pigments fade and fail quickly when exposed to strong sunlight, thus exhibiting poor lightfastness. Summary of the Invention

[0005] This invention provides a pigment coating capable of full-gamut controllable self-color changing and its preparation process. By improving the pigment formulation and dispersion technology, its stability under different environments is enhanced. Optimized nanostructure design reduces viewing angle dependence, improving its application prospects in the automotive, construction, and other fields. It also solves the problems of narrow color gamut and high energy consumption in traditional electrochromic technologies.

[0006] In a first aspect, the present invention provides a pigment coating capable of achieving full-gamut controllable self-color changing, comprising a substrate layer, a functional layer and a magnetic control layer, wherein the functional layer comprises the following components in parts by weight: 100-300 parts Fe3O4@SiO2 nanorods, 12-18 parts nano TiO2, 8-12 parts Ag nanoparticles, 3-6 parts titanium dioxide, 2-5 parts dispersant, and 3-6 parts photoinitiator.

[0007] Preferably, the method for preparing the functional layer includes the following steps: (1) Fe3O4@SiO2 nanorods, nano TiO2, Ag nanoparticles and dispersant were mixed evenly to obtain a prepolymer solution; (2) The prepolymer liquid, titanium dioxide and photoinitiator are placed under an external magnetic field and polymerized by ultraviolet light or heat. After the reaction is completed, the functional layer is obtained.

[0008] Preferably, the dispersant is one or more of dimethyl sulfoxide, N,N-dimethylformamide, N-methylpyrrolidone, alcohols, halogenated hydrocarbons, and water.

[0009] Preferably, the photoinitiator is any one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, potassium persulfate, ammonium persulfate, and azobisisobutyronitrile.

[0010] Preferably, the particle size of the nano-TiO2 is 5-10 nm, the particle size of the Ag nanoparticles is 250-300 nm, and the particle size of the Fe3O4@SiO2 nanorods is 10-50 nm.

[0011] Preferably, the matrix layer comprises polyurethane, acrylic resin, methyl methacrylate and acrylamide, wherein the mass ratio of polyurethane, acrylic resin, methyl methacrylate and acrylamide is 1-3:2-3:1-2:1.

[0012] Preferably, the thickness of the substrate layer is 1-300 μm.

[0013] Preferably, the magnetic control layer is a cucurbitacin-violetin complex and a manganese-zinc ferrite, wherein the mass ratio of the cucurbitacin-violetin complex to the manganese-zinc ferrite is 1-3:1.

[0014] Secondly, the present invention provides a method for preparing a pigment coating capable of achieving full-gamut controllable self-color changing, comprising the following steps: S1: Preparation of the matrix layer: Polyurethane, acrylic resin, methyl methacrylate and acrylamide are mixed in a certain mass ratio to prepare the matrix layer; S2: The obtained functional layer is deposited on the substrate layer by chemical vapor deposition; S3: After mixing the cucurbitacin-violetin complex and manganese zinc ferrite, a magnetic control layer is integrated on the functional layer. After baking at 60-80℃ and pre-curing, magnetic field orientation is performed, and finally UV-LED instantaneous fixation is performed to obtain a pigment coating that can achieve full-gamut controllable self-coloring.

[0015] Preferably, in step (3), the local magnetic field strength is controlled by a program, and the magnetic field strength is 0.05-0.5T.

[0016] In summary, the present invention has the following beneficial effects: This invention introduces smart materials and sensing technology to enable proactive response and adjustment to environmental conditions. For example, it develops coating materials with self-healing capabilities, which can automatically repair themselves when a color change is detected.

[0017] 2. The substrate layer of this invention comprises polyurethane, acrylic resin, methyl methacrylate, and acrylamide, which bond with the substrate through chemical or physical action, enhancing the adhesion between the coating and the substrate, thereby improving the stability and durability of the coating. The substrate layer can also act as a chemical stabilizing layer, preventing adverse reactions between the substrate and pigments, thus extending the service life of the coating.

[0018] 3. This invention improves the stability of pigments under different environments by refining pigment formulation and dispersion technology. By optimizing the nanostructure design, it reduces viewing angle dependence, thereby enhancing its application prospects in the automotive, construction, and other fields.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of the present invention. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources.

[0021] Example Example 1 A pigment coating capable of achieving full-gamut controllable self-coloring includes a substrate layer, a functional layer, and a magnetic control layer. The functional layer comprises the following components in parts by weight: 100 parts Fe3O4@SiO2 nanorods, 12 parts nano TiO2, 8 parts Ag nanoparticles, 3 parts titanium dioxide, 2 parts dispersant, and 3 parts photoinitiator.

[0022] The method for preparing the functional layer includes the following steps: (1) Fe3O4@SiO2 nanorods, nano TiO2, Ag nanoparticles and dispersant were mixed evenly to obtain a prepolymer solution; (2) The prepolymer liquid, titanium dioxide and photoinitiator are placed under an external magnetic field and polymerized by ultraviolet light or heat. After the reaction is completed, the functional layer is obtained.

[0023] The dispersant is dimethyl sulfoxide; the photoinitiator is 2-hydroxy-2-methyl-1-phenylpropanone; the particle size of nano-TiO2 is 5 nm, the particle size of Ag nanoparticles is 250 nm, and the particle size of Fe3O4@SiO2 nanorods is 10 nm.

[0024] The substrate layer comprises polyurethane, acrylic resin, methyl methacrylate, and acrylamide, wherein the mass ratio of polyurethane, acrylic resin, methyl methacrylate, and acrylamide is 1:2:1:1. The thickness of the substrate layer is 100 μm.

[0025] The magnetic control layer consists of a cucurbitacin-violetin complex and a manganese-zinc ferrite, with a mass ratio of 1:1.

[0026] A method for preparing a pigment coating capable of full-gamut controllable self-color changing includes the following steps: S1: Preparation of the matrix layer: Polyurethane, acrylic resin, methyl methacrylate and acrylamide are mixed in a certain mass ratio to prepare the matrix layer; S2: The obtained functional layer is deposited on the substrate layer by chemical vapor deposition; S3: A pigment coating capable of achieving full-gamut controllable color change is prepared by mixing a cucurbitacin-violetin complex with manganese-zinc ferrite and integrating it with a magnetic control layer on the functional layer. After pre-curing at 60°C, magnetic field orientation is performed, followed by instantaneous UV-LED fixation. The local magnetic field strength is controlled by a program, with a magnetic field strength of 0.05T.

[0027] Continuous color change across the full color gamut of 380-780nm, color difference ΔE≥60, response time<1s.

[0028] Example 2 A pigment coating capable of achieving full-gamut controllable self-coloring includes a substrate layer, a functional layer, and a magnetic control layer. The functional layer comprises the following components in parts by weight: 200 parts Fe3O4@SiO2 nanorods, 15 parts nano TiO2, 10 parts Ag nanoparticles, 4 parts titanium dioxide, 3 parts dispersant, and 5 parts photoinitiator.

[0029] The method for preparing the functional layer includes the following steps: (1) Fe3O4@SiO2 nanorods, nano TiO2, Ag nanoparticles and dispersant were mixed evenly to obtain a prepolymer solution; (2) The prepolymer liquid, titanium dioxide and photoinitiator are placed under an external magnetic field and polymerized by ultraviolet light or heat. After the reaction is completed, the functional layer is obtained.

[0030] The dispersant is dimethyl sulfoxide; the photoinitiator is 2-hydroxy-2-methyl-1-phenylpropanone; the particle size of nano-TiO2 is 8 nm, the particle size of Ag nanoparticles is 280 nm, and the particle size of Fe3O4@SiO2 nanorods is 30 nm.

[0031] The matrix layer comprises polyurethane, acrylic resin, methyl methacrylate, and acrylamide, wherein the mass ratio of polyurethane, acrylic resin, methyl methacrylate, and acrylamide is 3:2:1:1. The thickness of the matrix layer is 200 μm.

[0032] The magnetic control layer consists of a cucurbitacin-violetin complex and manganese-zinc ferrite, with a mass ratio of 2:1.

[0033] A method for preparing a pigment coating capable of full-gamut controllable self-color changing includes the following steps: S1: Preparation of the matrix layer: Polyurethane, acrylic resin, methyl methacrylate and acrylamide are mixed in a certain mass ratio to prepare the matrix layer; S2: The obtained functional layer is deposited on the substrate layer by chemical vapor deposition; S3: A pigment coating capable of achieving full-gamut controllable color change is prepared by mixing a cucurbitacin-violetin complex with manganese-zinc ferrite and integrating it with a magnetic control layer on the functional layer. After pre-curing at 70°C, magnetic field orientation is performed, followed by instantaneous UV-LED fixation. The local magnetic field strength is controlled by a program, with a magnetic field strength of 0.1T.

[0034] Continuous color change across the full color gamut of 380-780nm, color difference ΔE≥40, response time<1s.

[0035] Example 3 A pigment coating capable of achieving full-gamut controllable self-coloring includes a substrate layer, a functional layer, and a magnetic control layer. The functional layer comprises the following components in parts by weight: 300 parts Fe3O4@SiO2 nanorods, 18 parts nano TiO2, 12 parts Ag nanoparticles, 6 parts titanium dioxide, 5 parts dispersant, and 6 parts photoinitiator.

[0036] The method for preparing the functional layer includes the following steps: (1) Fe3O4@SiO2 nanorods, nano TiO2, Ag nanoparticles and dispersant were mixed evenly to obtain a prepolymer solution; (2) The prepolymer liquid, titanium dioxide and photoinitiator are placed under an external magnetic field and polymerized by ultraviolet light or heat. After the reaction is completed, the functional layer is obtained.

[0037] The dispersant is dimethyl sulfoxide; the photoinitiator is 2-hydroxy-2-methyl-1-phenylpropanone; the particle size of nano-TiO2 is 10 nm, the particle size of Ag nanoparticles is 300 nm, and the particle size of Fe3O4@SiO2 nanorods is 50 nm.

[0038] The matrix layer comprises polyurethane, acrylic resin, methyl methacrylate, and acrylamide, wherein the mass ratio of polyurethane, acrylic resin, methyl methacrylate, and acrylamide is 3:3:2:1. The thickness of the matrix layer is 300 μm.

[0039] The magnetic control layer consists of a cucurbitacin-violetin complex and manganese-zinc ferrite, with a mass ratio of 3:1.

[0040] A method for preparing a pigment coating capable of full-gamut controllable self-color changing includes the following steps: S1: Preparation of the matrix layer: Polyurethane, acrylic resin, methyl methacrylate and acrylamide are mixed in a certain mass ratio to prepare the matrix layer; S2: The obtained functional layer is deposited on the substrate layer by chemical vapor deposition; S3: A pigment coating capable of achieving full-gamut controllable color change is prepared by mixing a cucurbitacin-violetin complex with manganese-zinc ferrite and integrating it with a magnetic control layer on the functional layer. After pre-curing at 80℃, magnetic field orientation is performed, and finally, UV-LED instantaneous fixation is applied. The local magnetic field strength is controlled by a program, with a magnetic field strength of 0.5T.

[0041] Continuous color change across the full color gamut of 380-780nm, color difference ΔE≥50, response time<1s.

[0042] Comparative Example 1 The difference from Example 1 is that Fe3O4@SiO2 nanorods were not added to the functional layer.

[0043] Comparative Example 2 The difference from Example 1 is that no nano-TiO2 was added to the functional layer.

[0044] The comparative example shows continuous color change across the entire color gamut from 380 to 780 nm, with a color difference ΔE ≥ 80 and a response time < 10 s.

[0045] The above description is merely an exemplary embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pigment coating capable of achieving full-gamut controllable self-color changing, characterized in that, It includes a substrate layer, a functional layer and a magnetic control layer. The functional layer comprises the following components in parts by weight: 100-300 parts Fe3O4@SiO2 nanorods, 12-18 parts nano TiO2, 8-12 parts Ag nanoparticles, 3-6 parts titanium dioxide, 2-5 parts dispersant, and 3-6 parts photoinitiator.

2. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The method for preparing the functional layer includes the following steps: (1) Fe3O4@SiO2 nanorods, nano TiO2, Ag nanoparticles and dispersant were mixed evenly to obtain a prepolymer solution; (2) The prepolymer liquid, titanium dioxide and photoinitiator are placed under an external magnetic field and polymerized by ultraviolet light or heat. After the reaction is completed, the functional layer is obtained.

3. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The dispersant is one or more of dimethyl sulfoxide, N,N-dimethylformamide, N-methylpyrrolidone, alcohols, halogenated hydrocarbons, and water.

4. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The photoinitiator is any one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, potassium persulfate, ammonium persulfate, and azobisisobutyronitrile.

5. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The nano-TiO2 has a particle size of 5–10 nm, the Ag nanoparticles have a particle size of 250–300 nm, and the Fe3O4@SiO2 nanorods have a particle size of 10–50 nm.

6. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The matrix layer comprises polyurethane, acrylic resin, methyl methacrylate and acrylamide, wherein the mass ratio of polyurethane, acrylic resin, methyl methacrylate and acrylamide is 1-3:2-3:1-2:

1.

7. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The thickness of the substrate layer is 1-300 μm.

8. The pigment coating capable of achieving full-gamut controllable self-color changing according to claim 1, characterized in that, The magnetic control layer is composed of cucurbitacin-violetin complex and manganese-zinc ferrite, with a mass ratio of cucurbitacin-violetin complex to manganese-zinc ferrite of 1-3:

1.

9. The method for preparing a pigment coating capable of full-gamut controllable self-color changing according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Preparation of the matrix layer: Polyurethane, acrylic resin, methyl methacrylate and acrylamide are mixed in a certain mass ratio to prepare the matrix layer; S2: The obtained functional layer is deposited on the substrate layer by chemical vapor deposition; S3: After mixing the cucurbitacin-violetin complex and manganese zinc ferrite, a magnetic control layer is integrated on the functional layer. After baking at 60-80℃ and pre-curing, magnetic field orientation is performed, and finally UV-LED instantaneous fixation is performed to obtain a pigment coating that can achieve full-gamut controllable self-coloring.

10. The method for preparing a pigment coating capable of full-gamut controllable self-color changing according to claim 9, characterized in that, In step (3), the local magnetic field strength is controlled by the program, and the magnetic field strength is 0.05-0.5T.