TPU film with excellent surface polarity and preparation process thereof

Abstract

The invention provides a TPU film with excellent surface polarity and a preparation process thereof. The TPU film is composed of 80-95 parts of polyurethane particles and 5-15 parts of a silicon-aluminum salt. The preparation process comprises the following steps: firstly, sequentially putting the above-mentioned weight parts of polyurethane particles and silicon-aluminum salt into a stirrer for stirring respectively, and putting the evenly stirred polyurethane particles and silicon-aluminum salt into a drying dehumidifier for drying and dehumidifying treatment; putting the mixture of the polyurethane particles and the silicon-aluminum salt into a double-helix plasticator for plasticizing, extruding the plasticized mixture of the polyurethane particles and the silicon-aluminum salt into cold water for cooling, and performing shearing into particles after cooling so as to obtain TPU film particles; putting the prepared TPU film particles into a drying machine for drying treatment; and putting the dried TPU film particles into a casting machine, carrying out casting treatment, and conducting roll forming to finally obtain the TPU film. The rearranged matrix molecular gaps are adjusted by utilizing a reasonable chemical formula, so that the surface tension of the TPU film reaches 38-40 dynes, and the requirements of users for printing and gluing are met.

Description

technical field [0001] The invention belongs to the technical field of TPU film and its preparation process, and in particular relates to a TPU film with good surface polarity and its preparation process. Background technique [0002] The TPU film belongs to the longitudinal stretching film in the production process. Rolling and stretching in the production process will greatly change the polarity of the surface of the TPU film, and the surface tension of the TPU film is closely related to the molecular arrangement matrix. The tension is small, which is not conducive to ink printing and gluing. Generally, enterprises use chemical treatment additives to change the surface tension in the printing and gluing process of TPU film, and use toluene or DMF solvent to wipe the surface of TPU film to destroy TPU. The surface structure of the film makes the surface of the TPU film appear concave-convex and undulating, so as to achieve the best effect of gluing and printing. However, wi...

AI Technical Summary

Problems solved by technology

[0002] The TPU film belongs to the longitudinal stretching film in the production process. Rolling and stretching in the production process will greatly change the polarity of the surface of the TPU film, and the surface tension of the TPU film is closely related to the molecular arrangement matrix. The tension is small, which is not conducive to ink printing and gluing. Generally, enterprises use chemical treatment additives to change the surface tension of TPU film in the printing and gluing process, and use toluene or DMF solvent to wipe the surface of TPU film to destroy TPU. The surface structure of the film makes the surface of the TPU film appear concave-convex and undulating, so as to achieve the best effect of gluing and printing. However, with the ban on chemical reagents and harmful substances, toluene and DMF solvents are no longer used. Cater to market needs

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