Preparation and application of coating forming type TPU film and coating forming type TPU paint surface protective film

Abstract

The invention discloses preparation and application of a coating forming type TPU film and a coating forming type TPU paint surface protective film. The preparation method comprises the steps of dissolving isocyanate in a solvent, adding macromolecular ethylene glycol to prolong the reaction time, then adding a chain extender, a flatting agent and a defoaming agent, and stirring through a stirrer to prepare a TPU pre-coating material, conveying the TPU pre-coating material to a high-precision coating head, uniformly coating the release surface of a PET release protective film to form a TPU film layer with uniform thickness; and conveying the coated TPU film layer to a drying oven through a conveying device, removing redundant solvent through evaporation, crosslinking and curing the monomers are under the high-temperature condition to form a solid elastic film, and finally rolling and forming the solid elastic film. According to the process, the TPU particle re-forming processing process is omitted, the manufacturing process is greatly simplified and shortened, and the production cost is reduced. The coating forming type TPU paint surface protective film prepared by the invention has the advantages of high stretch rate, high strength and toughness, higher initial adhesion and excellent permanent adhesion.

Description

technical field [0001] The invention relates to the technical field of paint surface protection films, in particular to a coating-forming TPU film and its [0002] Preparation and application of paint protective film. Background technique [0003] TPU has excellent characteristics of high tension, high tensile strength, toughness and aging resistance, and is a mature environmental protection material. At present, TPU has been widely used in medical and health care, electronic appliances, industry and sports, etc. It has high strength, good toughness, wear resistance, cold resistance, oil resistance, water resistance, aging resistance, weather resistance and other characteristics unmatched by other plastic materials. At the same time, it has many excellent functions such as high waterproof and moisture permeability, windproof, cold proof, antibacterial, mildew proof, warm keeping, UV resistance and energy release. [0004] Thermoplastic polyurethane elastomer TPU can be div...

AI Technical Summary

Problems solved by technology

However, due to process limitations, the thickness of the produced TPU film layer is uneven, which cannot meet the film surface requirements of optical films.

The thickness of the TPU film produced by the calendering method is uniform, and the performance indicators are also higher than the previous two production methods. However, because the initial investment in equipment is much higher than the previous two methods, investors are discouraged.

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