TPU film and preparation method thereof

Abstract

The invention provides a TPU film comprising a resin layer. A heavy release film layer is arranged on one side of the TPU resin layer; a light release film layer is arranged on the other side far awayfrom the heavy release film layer of TPU resin layer; the release force of the heavy release film layer ranges from 500 g / 25 mm to 700 g / 25 mm, and the release force of the light release film layer ranges from 300 g / 25 mm to 500 g / 25 mm. By means of the TPU film, when the light release film layer on one side of the TPU resin layer is uncovered, the heavy release film layer is uncovered and separated, and bubbles are generated.

Description

technical field [0001] The present invention relates to films, in particular to TPU films. Background technique [0002] Thermoplastic polyurethane (TPU) not only has the rubber characteristics of high strength and high wear resistance of cross-linked polyurethane, but also has the thermoplastic properties of linear polymer materials, so that its application can be extended to the field of plastics. Especially in recent decades, TPU has become one of the fastest growing polymer materials. TPU film is an important application form of TPU material. In recent years, it has been more and more widely used with the development and progress of high technology. [0003] It is precisely because TPU has excellent wear resistance, tear resistance, and flexion strength; high tensile strength, high elongation, and low long-term compression set rate. At the same time, it has good resistance to oils (mineral oil, animal and vegetable oils and lubricating oils) and many solvents; TPU also...

AI Technical Summary

Problems solved by technology

Whether it is the application of curved screen protective film or the self-healing protective film of the top paint in the automotive industry, the raw materials require a large amount of TPU film substrates, and most of these film substrates rely on imports and are expensive

At present, the TPU substrates used in electronic curved surface protective films and automotive self-repairing protective films on the market are basically made by high-temperature extrusion molding, so the thickness uniformity is relatively poor, which affects its optical effect; and this type of TPU In order to improve its mechanical properties (breaking strength), the film mostly uses raw materials containing benzene rings. The protective film made of TPU synthesized by such raw materials has excellent mechanical properties, but it has a fatal flaw: under the action of ultraviolet rays, it will Initiate the decomposition of urethane bonds to generate aromatic amines. After the benzene nuclei on the aromatic amines are oxidized and rearranged, they generate chromophoric groups such as quinone structures, so that the produced TPU film products are easy to yellow and have poor durability. It limits its application on electronic protective film and car coating film, and the customer experience is poor

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