High-strength composite food packaging film and preparation method thereof
A composite food, high-strength technology, applied in packaging, wrapping paper, wrapping paper, etc., can solve the problems of poor mechanical strength of composite packaging film, limiting the use of composite packaging film, stretching deformation, etc.
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[0013] The invention provides a preparation method of a high-strength composite food packaging film, comprising:
[0014] 1) Extruding starch, white carbon black, methylcellulose, carbon nanotubes and water to obtain puffed products;
[0015] 2) Mix PP (polypropylene), polylactic acid, n-butyl methacrylate, white oil, ceramic powder, rare earth oxides, tea polyphenols, globulin and puffed products to obtain a mixed product;
[0016] 3) The paper substrate is roughened, and then the coupling agent is coated on the surface of the paper substrate to form a coupling layer, and then the kneaded material is coated on the surface of the coupling layer to form a protective layer, and finally dried to produce High-strength composite food packaging film.
[0017] In step 1) of the present invention, the specific conditions of the puffing treatment can be selected in a wide range, but in order to further improve the excellent mechanical properties of the prepared high-strength composite...
Embodiment 1
[0031] 1) Starch, white carbon black, methyl cellulose, carbon nanotubes (with a particle size of 20nm) and water are puffed at 80°C for 13 hours at a weight ratio of 100:12:2:0.7:180 to obtain puffed products ;
[0032] 2) Mix PP, polylactic acid, n-butyl methacrylate, white oil, ceramic powder, lanthanum oxide, tea polyphenols, globulin and puffed products according to the ratio of 100:38:39:12:11:5:1.5:7: The weight ratio of 58 was kneaded at 190° C. for 10 h to obtain a kneaded product;
[0033] 3) The paper substrate (vellum, thickness 10 silk) is roughened until the surface roughness is 3-8Ra, and the coupling agent KH550 is coated on the surface of the paper substrate to form a coupling layer (thickness 0.2 silk). Cover the surface of the coupling layer to form a protective layer (thickness is 0.7 silk), and finally dry (from 25°C to 55°C at a rate of 2°C / min and hold for 3 hours, then at a rate of 0.7°C / min to 78 ℃ and heat preservation for 11h) to prepare high-stren...
Embodiment 2
[0035] 1) Starch, white carbon black, methylcellulose, carbon nanotubes (with a particle size of 10nm) and water are puffed at 70°C for 10 hours at a weight ratio of 100:10:1:0.5:150 to obtain puffed products ;
[0036] 2) Mix PP, polylactic acid, n-butyl methacrylate, white oil, ceramic powder, rubidium oxide, tea polyphenols, globulin and puffed products according to the ratio of 100:34:35:9:9:3:1.1:5: The weight ratio of 50 was kneaded at 185°C for 8h to obtain a kneaded product;
[0037] 3) The paper substrate (jute paper, thickness 5 filaments) is roughened until the surface roughness is 3Ra, and the coupling agent KH560 is coated on the surface of the paper substrate to form a coupling layer (thickness 0.1 filaments). On the surface of the coupling layer to form a protective layer (thickness of 0.5 silk), and finally dry (from 20°C at a rate of 1°C / min to 50°C and keep it for 2 hours, then at a rate of 0.5°C / min to 75°C and heat preservation for 9h) to prepare high-str...
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