KR-102962183-B1 - A manufacturing method of infrared and ultraviolet reflective film using particles of a core-shell structure having an eccentric core, and A reflective film manufactured thereby

Abstract

The present invention relates to a method for manufacturing a reflective film using particles having a core-shell structure with an eccentric core, and to a reflective film manufactured thereby. More specifically, the invention relates to a method for manufacturing a reflective film that exhibits high reflectivity for infrared and ultraviolet rays without being affected by the angle of incident light, using inorganic oxide particles positioned eccentrically from the central axis inside particles having an eccentric core-shell structure comprising a core containing inorganic oxide particles and a shell containing a polymer, and to a reflective film manufactured thereby.

Inventors

• 장동환
• 김상영
• 이기라
• 문정빈

Assignees

• 현대자동차주식회사
• 기아 주식회사
• 성균관대학교산학협력단

Dates

Publication Date

20260507

Application Date

20191007

Claims (18)

1. A step of preparing a dispersion containing particles having an eccentric core-shell structure and a solvent; A step of manufacturing a structure by drying the above dispersion; and The step of manufacturing a polymer film by modifying the above structure; comprising The above core includes inorganic oxide particles, and The above shell contains a polymer, and The above-mentioned eccentric core-shell structured particles are, A step of introducing functional groups to the surface of inorganic oxide particles; and Manufactured through the step of coating a polymer onto inorganic oxide particles into which the above functional group has been introduced; The step of coating the polymer is carried out by adding a monomer and an initiator to the inorganic oxide particles, and The above initiator is characterized by comprising potassium persulfate, and A method for manufacturing an infrared and ultraviolet reflective film, wherein, in the step of manufacturing a structure, the drying is carried out at 15 to 25°C.
2. In paragraph 1, In the step of coating the polymer, the inorganic oxide particles are contained in an aqueous solution, and The concentration of inorganic oxide particles in the above aqueous solution is 0.1 weight% to 5 weight%, and A method for manufacturing an infrared and ultraviolet reflective film in which the volume ratio of the monomer and the aqueous solution is 1:8 to 1:20.
3. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film in which the functional group includes a vinyl group.
4. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film, wherein the inorganic oxide particles include any one selected from the group consisting of silica, titania, zirconia, and combinations thereof.
5. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film, wherein the above polymer comprises any one selected from the group consisting of polystyrene, polymethyl methacrylate, and combinations thereof.
6. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film, wherein the solvent comprises any one selected from the group consisting of water, ethanol, isopropyl alcohol, and combinations thereof.
7. delete
8. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film in which the above structure comprises particles having an eccentric core-shell structure.
9. In paragraph 8, A method for manufacturing an infrared and ultraviolet reflective film, wherein the polymer film is manufactured by modifying the polymer contained in the particles of the eccentric core-shell structure during the step of manufacturing the polymer film.
10. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film in which, in the step of manufacturing a polymer film, the deformation of the shell is caused by at least one selected from heat and an organic solvent under constant pressure.
11. In Paragraph 10, A method for manufacturing an infrared and ultraviolet reflective film in which, when the deformation of the shell is caused by heat, heat greater than the glass transition temperature of the polymer is applied to the shell.
12. In Paragraph 10, If shell deformation is caused by heat, The above structure is compressed under a certain pressure, and A method for manufacturing an infrared and ultraviolet reflective film, wherein the structure is formed into a polymer film by applying heat to the polymer contained in the structure to melt the polymer.
13. In Paragraph 10, A method for manufacturing an infrared and ultraviolet reflective film, wherein, when the deformation of the shell is caused by heat, heat of 100 to 250°C is applied to the shell.
14. In Paragraph 10, A method for manufacturing an infrared and ultraviolet reflective film, wherein the organic solvent comprises any one selected from the group consisting of tetrahydrofuran, dimethylformamide, dimethyl sulfoxide, dimethylacetamide, and combinations thereof.
15. In Paragraph 10, In cases where shell deformation is caused by organic solvents, The above structure is compressed under a certain pressure, and A method for manufacturing an infrared and ultraviolet reflective film, wherein the structure is prepared in the form of a polymer film by dissolving the polymer contained in the structure with the organic solvent.
16. In paragraph 1, A method for manufacturing an infrared and ultraviolet reflective film, wherein the particle size of the above-described eccentric core-shell structure is 30 to 500 nm.
17. A reflective film characterized by being manufactured by the manufacturing method of claim 1 above.
18. In Paragraph 17, The above reflective film comprises a polymer and inorganic oxide particles dispersed in the polymer, and A reflective film in which the distance between adjacent inorganic oxide particles is 0 to 1 μm.

Description

A manufacturing method of infrared and ultraviolet reflective film using particles of a core-shell structure having an eccentric core, and a reflective film manufactured thereby The present invention relates to a method for manufacturing a reflective film using particles having a core-shell structure with an eccentric core, and to a reflective film manufactured thereby. More specifically, the invention relates to a method for manufacturing a reflective film that exhibits a uniformly high reflectance for infrared and ultraviolet rays without being affected by the angle of incident light, using inorganic oxide particles positioned eccentrically from the central axis inside particles having an eccentric core-shell structure comprising a core containing inorganic oxide particles and a shell containing a polymer, and to a reflective film manufactured thereby. When colloidal particles with wavelengths close to the wavelength of light are arranged periodically, the periodic arrangement of the particles results in the repetition of periodic refractive indices. Structures exhibiting such repeating specific refractive indices reflect specific wavelengths, and such materials are called photonic crystals. Since these photonic crystals reflect light based on their uniformly arranged structure, the wavelength of the reflected light varies as the angle of incidence changes. To overcome this limitation, research is being conducted on photonic glass structures that scatter light within specific wavelength ranges. Because the periodicity of photonic glass structures is not perfect, they can reflect a constant wavelength even when the angle of incidence changes. Meanwhile, temperatures inside buildings and vehicles rise rapidly, leading to significant energy consumption and, in some cases, accidents. The reason for this temperature increase is the transfer of heat via infrared (IR) radiation; consequently, many companies and research laboratories are conducting research on methods to block infrared rays. Although the demand for infrared and ultraviolet blocking is increasing, leading to much research and the release of products, currently available metal-coated films and polymer-laminated films are raising issues regarding electromagnetic interference and visibility. Korean Published Patent No. 10-2019-0002776 relates to a heat-blocking film and provides a multilayer heat-blocking film comprising an infrared reflective portion and an ultraviolet absorbing portion, and a metal oxide, characterized by high visible light transmittance. However, a heat-blocking film composed of a multilayer substrate with the above configuration actually has poor visible light transmittance, and also excludes a special configuration capable of uniformly reflecting light of a specific wavelength from multiple angles. Figure 1 shows a flowchart of the manufacturing process of the reflective film of the present invention. Figure 2 shows a flowchart of the manufacturing process of the core-shell structured particles of the present invention. Figure 3 shows a schematic diagram of the manufacturing process of the reflective film of the present invention. Figure 4 shows core-shell structured particles dispersed in a dispersion observed using a transmission electron microscope. Figure 5 shows the structure observed with a scanning electron microscope. Figure 6 shows a polymer film prepared in a manufacturing example of the present invention. Figure 7 shows the structure before heat treatment and the polymer film after heat treatment observed with a reflection microscope. Figure 8 is a graph showing the reflectance, etc., of the polymer film prepared in the preparation example according to wavelength. The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to ensure that the spirit of the invention is sufficiently conveyed to a person skilled in the art. In describing each drawing, similar reference numerals have been used for similar components. In the attached drawings, the dimensions of the structures are depicted enlarged from their actual size for clarity of the invention. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwi