Environmentally-friendly color-changing packaging leather and preparation method thereof

Abstract

The invention relates to the technical field of synthetic leather, in particular to environmentally-friendly color-changing packaging leather and a preparation method thereof. The environmentally-friendly color-changing packaging leather comprises a packaging leather base body, wherein a thermochromic layer and a waterborne polyurethane surface layer are arranged on the packaging leather base bodyin sequence; the thermochromic layer is prepared from the following substances in parts by weight: 34 to 52 parts of waterborne polyurethane, 8 to 19 parts of a chromic material, 0.1 to 1.2 parts ofa dispersant, 0.2 to 1.4 parts of a defoaming agent, 2 to 13 parts of an adhesive force accelerant and 30 to 45 parts of water. According to the chromic packaging leather disclosed by the invention, the thermochromic layer taking the waterborne polyurethane as a carrier and taking vanadium dioxide as the color-changing material is adopted, so that no organic solvent is used, and no pollution is caused; therefore, the environmentally-friendly color-changing packaging leather is prepared; after being subjected to modification treatment, the vanadium dioxide can be stably dispersed in the waterborne polyurethane base body, and the uniformity of a chromophoric group is guaranteed; therefore, the chromophoric uniformity of the thermochromic leather is guaranteed; no phenomenon of obvious patchcolors is caused; the quality of the color-changing packaging leather is improved.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to an environment-friendly color-changing packaging leather and a preparation method thereof. Background technique [0002] Color-changing leather usually refers to artificial leather that changes color under changes in temperature or pressure. Stress color-changing leather is one of the representatives of such products. It is made of a new type of color-changing resin and a specific process technology. The deformed part of the artificial leather will show a color change, and with the change of the deformation gradient, the color will show a gradual change from light to dark, which can give people a natural and soft feeling. Once the external force is removed, the color of the leather surface will naturally return to its original state. Now it is common to use a combination of stress-changing wax powder, nylon fluff powder, solvents, and additives. It changes color by s...

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Problems solved by technology

[0003] For example, the invention patent application with the application number "CN201510442388.5" and the invention title "A temperature-controlled discoloration leather and its production process" discloses a temperature-controlled discoloration leather, which includes a discoloration coating , the color-changing coating is made of anionic polyurethane and color-changing slurry at a volume ratio of 0.05-0.15:1; the color-changing slurry includes the following components in parts by weight: 5-8 parts of melamine resin, 1 -5 parts of 2-anilino-3-methyl-6-dibutylaminofluorane, 3-10 parts of 4,4'-sulfonyldiphenol, 5-30 parts of thermochromic powder and 70-90 parts of fatty acid Methyl ester, the principle of temperature-controlled discoloration is that the solid-liquid state changes with the change of stearate with temperature, and 2-phenylamino-3-methyl-6-dibutylaminofluorane presents different colors with the change of temperature. Transparency and the temperature control and color fixation of 4,4'-sulfonyl diphenol have a synergistic effect; however, the organic solvent contained in the color-changing coating is likely to cause environmental pollution during the production process; another example is the application number of "CN201310511165.0", the invention patent application titled "Environmental-friendly water-based color-changing synthetic leather and its preparation method", which is formed by coating the color-changing slurry on the surface of the leather by the scraping method, and the color-changing slurry is Non-irritating organic solvents, thus greatly reducing the pollution to the environment, but the operation of gluing on the surface of the leather by scraping method is easy to cause the shortcomings of insufficient glue and uneven coating, which greatly affects the Flatness of finished product

[0004] In addition, if the discoloration material added to the artificial leather has the problem of uneven dispersion, it is very easy to have uneven color such as stains, which will affect the quality of the product

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