The invention provides a high-barrier
coating for a nylon film and a preparation method of the high-barrier
coating. The high-barrier
coating comprises a
solvent and high-molecular-weight
polyester polyol with a
hydroxyl value of 3-10mgKOH / g, wherein the
solvent is one or more of
ethyl acetate,
acetone,
butanone, N, N-
dimethylformamide, N-methyl pyrrolidone and N, N-
dimethylacetamide, and the
solvent is one or more of
ethyl acetate,
acetone,
butanone, N, N-
dimethylformamide, N-methyl pyrrolidone and N, N-
dimethylacetamide; the macromolecular
polyester polyol is prepared by carrying out
polymerization reaction on polybasic acid,
polyol and a
fluorine-containing
monomer in the presence of a catalyst; the
fluorine-containing
monomer is 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8-tridecafluoro-1-
octanol, and the content of the
fluorine-containing
monomer is 0.01%-3% of the total
mass. After a nylon film containing the coating is compounded with a
polypropylene film by using an
adhesive, the peeling strength of the nylon film and the
polypropylene film after being cooked at the high temperature of 125 DEG C for 45 minutes is greater than 9N / 15mm, and the
oxygen permeability of the finished film is less than 0.4 cm < 3 > / (m < 2 >. 24h. 0.1 Mpa). The high boiling strength at 125 DEG C for 45 minutes can meet the requirements of a high-temperature
sterilization process of food, and the finished film has
low oxygen permeability and can inhibit the color change of the food.