Film coated iron used for food packaging and having lasting high surface tension, and preparation method thereof

Abstract

The invention provides film coated iron with excellent printability, and a preparation method thereof. The film coated iron is prepared by thermally compounding a polyester film with lasting high surface tension and a steel plate, wherein the polyester film is prepared by copolymerizing terephthalic acid, isophthalic acid, ethylene glycol and a fourth component and then biaxially stretching, a feeding molar ratio of terephthalic acid to ethylene glycol to isophthalic acid to the fourth component is (135-165):(148-194):(11-15):(0.01-12), the fourth component is one or a plurality of materials selected from isophthalic acid-5-sulfonate, 1,4-cyclohexanedimethanol, neopentyl glycol and trimellitic acid, and 1200 ppm by mass of SiO2 is added into the copolymerized polyester in an in-situ polymerization manner. The film coated iron has excellent printability and meets the use requirements of packaging containers for food, beverages and the like.

Description

technical field [0001] The invention relates to the field of film-coated metal plates for food metal packaging, in particular to a film-coated iron with durable high surface tension for food packaging and a preparation method thereof. Background technique [0002] In the traditional metal packaging container industry, thermosetting coatings are usually coated on the surface of metal materials for cans / lids, and a layer of thermosetting coating film is formed on the surface of metal materials through the volatilization of organic solvents to protect the metal from damage. Corrosion of the contents. With people's increasing requirements for living environment and food safety, such thermosetting coatings that pollute the environment and pose potential food safety hazards have been difficult to meet the increasingly stringent and high-demand packaging containers. [0003] In recent years, people have compounded thermoplastic biaxially oriented polyester film (BOPET) on the surfa...

AI Technical Summary

Problems solved by technology

[0005] When coated iron is applied to food and beverage packaging containers, it is necessary to print exquisite patterns, trademarks, text descriptions, etc. on the surface of coated iron and coated cans / lids by various printing methods. Introducing a printable layer into the surface layer to improve the wetting ability of the ink (CN 106957616A), or increasing the surface tension of the printing substrate by means of flame treatment (CN201680033425.X) to improve the wetting and spreading ability of the ink on its surface, thereby Improve its printability, so downstream users need to increase additional surface treatment equipment and related manpower input