Formula, preparation method and application technology of high-tension deep-drawn luncheon meat can inner wall coating

Abstract

The invention discloses a formula, a preparation method and an application technology of a high-extension deep-drawn luncheon meat can inner wall coating. The two-layer coating has excellent tensile resistance, and the coating still has excellent resistance to high temperature sterilization, sulfur cooking, salt cooking and electrochemical corrosion after subjected to high-tension deep drawing. Acoating layer formed after coating a luncheon meat can plate with the coating through transparent primer coating and transparent top coating application by using the technology still makes the meat easily separated after subjected to high tension, high temperature sterilization and salt cooking; the coating has a high slipperiness, does not need to be sprayed with wax, and is convenient to operateand construct; and the above food packaging material coating does not contain any toxic monomer, and is completely free of BPA, PVC and other toxic substances.

Description

technical field [0001] The invention relates to the field of metal packaging coatings, in particular to a formula, preparation and application process of a high-stretch deep-drawn lunch meat can inner wall coating. Background technique [0002] Tinplate cans are mainly the combination of cans and lids, which are packaged and processed to form a sealed large-diameter tinplate cans on the field are widely used in milk powder, coffee powder, seasonings, tea, medical drugs, luncheon meat and other food. Store various items. Because of technical limitations, existing large-diameter tinplate cans are generally three-piece cans, also known as tinplate three-piece cans. The three-piece cans are composed of a can body, a bottom cover and a top cover. In the production process of the three-piece can, the can body, the bottom cover and the top cover are made separately first, and the can body is made by seaming or welding, and then the bottom and top covers are seamed in turn to make ...

AI Technical Summary

Problems solved by technology

[0008] However, the existing high-stretching deep-drawn luncheon meat can manufacturing process needs to stretch the can body three times or more, and the stretching height and range are very large, and the diameter of the can body described in the finished can is 99-153mm, height 120-200mm; extremely high requirements on the tensile resistance of the coating, the chemical resistance after high stretching and the easy-to-separate performance after processing

In the prior art, the reaction of polyester resin with phenolic resin and amino resin will cause the paint film to be too brittle and cannot achieve the chemical resistance after high stretching

At the same time, because the coating is added with food-grade wax to enhance the food release effect, and most of the wax achieves its effect by floating to the surface of the coating. Its melting point is very low, and it is easy to cook at high temperature or in the process of salt cooking or sulfur cooking. is dissolved in the medium and loses its release properties

Its aluminum paste topcoat mainly utilizes the synergistic effect of aluminum powder and zinc oxide to achieve excellent properties such as high sulfur resistance and salt corrosion resistance. However, since both aluminum powder and zinc oxide are inert powders, the stretch resistance of the coating film will be reduced. Deterioration, and it is polyester phenolic system, silver streaks or cracks will appear in the aluminum paste topcoat, causing water molecules, H2S, Cl-, etc. to enter the primer and penetrate into the substrate, resulting in corrosion

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