Thermoplastic coating suitable for tinplate and aluminum foil heat sealing and preparation method thereof

Abstract

The invention discloses a thermoplastic coating applicable to heat sealing of tinplate and aluminum foil and a preparation method of the thermoplastic coating. The coating comprises a solid solute and a solvent, wherein the solid solute comprises 5%-30% of polyester resin, 20%-30% of acrylic resin, 40%-70% of vinyl chloride-acetate copolymer, 0.02%-0.1% of a heat stabilizer and 0.4%-0.5% of a scratch-resistant agent. Aiming to solve the problems of stripping difficulty caused by inappropriate heat sealing strength or influence of inside product quality by non-firm heat sealing as well as poorer stripping appearance caused by non-uniform distribution of the coating on two sides of the tinplate and aluminum foil during stripping in the prior art, the polyester resin, the acrylic resin and the vinyl chloride-acetate copolymer are adopted and mixed to serve as the thermoplastic coating, the heat sealing strength is appropriate, the adjustable range of the heat sealing strength is wide, and further, the appearance of the coating during stripping of the tinplate and aluminum foil is better.

Description

technical field [0001] The invention relates to a thermoplastic coating, in particular to a thermoplastic coating suitable for heat sealing tinplate and aluminum foil and a preparation method thereof. Background technique [0002] Tinplate and aluminum foil sealing packaging can be used in food, medicine and other fields. It has good sealing, anti-corrosion, and can make the shelf life of the product longer, making the product safer and more assured. [0003] The most common heat-sealing coatings for tinplate and aluminum foil have the following problems: [0004] The heat-sealing strength is not suitable. If the heat-sealing strength is too high, it will be difficult to uncover the aluminum foil during use; if the heat-sealing strength is too low, the quality of the internal products cannot be effectively guaranteed. [0005] When the aluminum foil is uncovered, the coating is unevenly distributed on the surface, which not only affects the appearance, but in serious cases,...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of unsuitable heat-sealing strength in the above-mentioned prior art, which leads to difficult peeling or weak heat-sealing, which affects the quality of internal products, and the uneven distribution of the coating on both sides of the tinplate and aluminum foil during peeling, which leads to relatively poor peeling appearance. Poor defects, provide a kind of thermoplastic coating suitable for heat sealing of tinplate and aluminum foil and its preparation method; the present invention makes synergistic effect by adding different kinds of resins, so that the prepared coating has moderate heat sealing strength, heat sealing The strength can be adjusted in a wide range, and the appearance is better when it is uncovered, etc.:

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