PU leather with color changing function through refraction of light and preparation method of PU leather

Abstract

The invention discloses PU leather with the color changing function through refraction of light. The PU leather comprises a basic cloth layer, a foaming layer, a color changing layer and a PU surfacelayer, wherein the color changing layer is a metal thin film provided with a plurality of bulges, and 3D color-changing pearlescent pigment is adopted to color the bulges on the surface of the thin film through a three-dimensional printer. The surfaces, facing to the same direction, of the bulges are colored with the same color, and the surfaces, facing to different directions, of the bulges are colored with different colors. The PU leather with the color changing function through refraction of light and obtained by adopting the preparation method can display different colors when being observed at different angles, overcomes the defects that common leather is single in color and can only display one color under different environments, has the advantages of being waterproof, pressure resistant, high in light resistance and the like, and cannot fade and lose efficacy even being exposed under the blazing sun for quite a long time.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, in particular to a PU leather with photorefractive discoloration and a preparation method thereof. Background technique [0002] PU leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. Leather is composed of natural protein fibers tightly woven in three-dimensional space. There is a special grain layer on the surface, which has natural grain and luster, and feels comfortable. However, ordinary leather always presents the same after use. There is no change in any color in different environments. [0003] Generally, the discoloration technology of PU leather is made by injecting a kind of prapu oil into the leather, because the diffusion and diffusion recovery of prapu oil make the color of the leather produce a gradual effect when it is stressed. The surface layer of discolored PU leather has a certain d...

AI Technical Summary

Problems solved by technology

[0004] Patent 104372681A discloses a cold-press branded color-changing PU leather, including a base cloth layer, a polyurethane adhesive layer, a water-repellent layer, a color-changing layer, and a polyurethane surface layer. There are several cavities between the color-changing layer and the water-repellent layer. There are microcapsules that are automatically broken by extrusion in the cavity, and the microcapsules are filled with color-changing ink. This patent can alleviate the loss of color-changing ink and improve the service life of color-changing PU leather; but this patent uses color-changing ink to realize the color change of PU leather. Discoloration, after PU leather has been repeatedly stretched by external forces, the discoloration ink will eventually be lost, and the discoloration effect of PU leather will still be affected

[0005] Patent 106113763A discloses a color-changing leather, which consists of a leather body and a color-changing leather. The color-changing leather includes a leather layer and a color-changing layer. The color-changing layer is added to the PU surface layer and BASE layer of the leather through a resin sheet. Resin, DMF, methyl ethyl ketone, heat and stir, then add ultraviolet color-changing powder, and process it into a resin sheet film by wetting, and the resin sheet film is pasted on the leather layer. When using the color-changing leather, it can show different colors in different environments. The leather of the same color, but the patent achieves the discoloration effect of PU leather by adding ultraviolet discoloration powder, but the light resistance of ultraviolet discoloration powder is poor, and it will fade quickly when exposed to strong sunlight, and in the preparation process, added A large amount of organic solvents are easy to pollute the environment

[0006] In recent years, people are more and more fond of drawing three-dimensional pictures, buying three-dimensional pictures, and the frames on the market also have three-dimensional effects, from pursuing the innocence of colors to pursuing the magical variation of colors; It can only show the effect of a two-dimensional plane, and does not have the disadvantage of three-dimensional effect, which limits the attractiveness of product applications.

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