Polylactic acid packaging film with controlled-release antioxidant activity and preparation method thereof
An antioxidant activity, polylactic acid technology, applied in packaging, wrapping paper, biological packaging, etc., can solve problems such as shortening, loading natural antioxidants, and instability of natural antioxidants, and achieve the effect of increasing toughness
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[0020] Example 1: The preparation method of the controlled release type antioxidant active polylactic acid packaging film is as follows:
[0021] (1) Mix 9500g of polylactic acid (weight average molecular weight of 100,000) and 500g of polytrimethylene carbonate (weight average molecular weight of 200,000) uniformly, and dry in a vacuum drying oven at 25°C for 10 hours to prepare matrix resin;
[0022] (2) Mixing 1600g of multi-walled carbon nanotubes and 400g of tea polyphenols to prepare a blend;
[0023] (3) Add the blend of step (2) to 16000 mL of dichloromethane, ultrasonically disperse for 20 minutes, and stir at room temperature for 12 hours to fully volatilize the dichloromethane solvent to obtain multi-walled carbon nanotube particles loaded with tea polyphenols;
[0024] (4) Take step (1) 8kg of matrix resin and step (3) 2kg of tea polyphenol-loaded multi-walled carbon nanotube particles, add them to the twin-screw extruder, blend them, and melt (the temperature of the four-s...
Example Embodiment
[0026] Example 2: The preparation method of the controlled-release antioxidant active polylactic acid packaging film is as follows:
[0027] (1) After mixing 8000g polylactic acid (weight average molecular weight of 100,000) and 2000g polytrimethylene carbonate (weight average molecular weight of 100,000) uniformly, dry them in a vacuum drying oven at 25°C for 10 hours to obtain matrix resin;
[0028] (2) Mix 980g of multi-walled carbon nanotubes and 20g of grape seed extract to prepare a blend;
[0029] (3) Add the blend of step (2) to 4000 mL of dichloromethane, ultrasonically disperse for 25 minutes, and stir at room temperature for 12 hours to fully volatilize the dichloromethane solvent to obtain multi-walled carbon nanotube particles loaded with grape seed extract;
[0030] (4) Take step (1) 9.8 kg of matrix resin and step (3) 0.2 kg of multi-walled carbon nanotube particles loaded with grape seed extract, add them to a twin-screw extruder, blend them, and melt (the temperature o...
Example Embodiment
[0032] Example 3: The preparation method of the controlled-release antioxidant active polylactic acid packaging film is as follows:
[0033] (1) After mixing 9000g polylactic acid (weight average molecular weight of 300,000) and 1000g polytrimethylene carbonate (weight average molecular weight of 250,000) uniformly, they are dried in a vacuum drying oven at 25°C for 10 hours to obtain matrix resin;
[0034] (2) Mixing 1700g of multi-walled carbon nanotubes and 300g of clove extract to prepare a blend;
[0035] (3) Add the blend of step (2) to 10000 mL of dichloromethane, ultrasonically disperse for 15 minutes, and stir at room temperature for 12 hours to fully volatilize the dichloromethane solvent to obtain multi-walled carbon nanotube particles loaded with clove extract;
[0036] (4) Take step (1) 8.5 kg of matrix resin and step (3) 1.5 kg of multi-walled carbon nanotube particles loaded with clove extract, add them to the twin-screw extruder, blend, and melt (the temperature of the ...
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