Matte varnish, black matte aluminum-plastic film and preparation method thereof

The invention provides matt varnish, a black matt aluminum-plastic film and a preparation method thereof, and the matt varnish comprises the following components in percentage by mass: 15-30% of hydroxy acrylic resin, 5-15% of hyperbranched polyester polyol resin, 1.5-5% of matting powder, 10-20% of an isocyanate curing agent and 20-80% of an organic solvent. The matte varnish is coated on the surface of a black nylon film, so that the black matte aluminum-plastic film can be obtained, the original structure of the aluminum-plastic film is not influenced, the matte varnish is compounded by hyperbranched polyester polyol resin and hydroxy acrylic resin, the hyperbranched polyester polyol resin has more carboxyl functional groups and is good in compatibility with matting powder, and the matte varnish has the advantages that the matting effect is good, and the matte effect is good. Powder is not easy to fall off after curing; the hydroxyl acrylic resin and the isocyanate curing agent have excellent chemical resi