Polylactic acid anti-bacterial-activity packaging material and preparation method thereof
A technology of antibacterial activity and packaging materials, applied in the field of polymers, can solve the problems of non-environmental degradation, shortage of raw materials, and unmentioned problems, and achieve the effects of simple process, improved mechanical properties, and good inhibition
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Embodiment 1
[0026] (1) Mix polylactic acid and polytrimethylene carbonate in a mass ratio of 9:1 and dry them in a vacuum oven for 10 hours;
[0027] (2) Feed 100 parts by weight of polylactic acid and polytrimethylene carbonate obtained in step (1) from the first feed port of the twin-screw extruder, and transport them through the screw conveying section. After the trimethylene carbonate preheating temperature reaches 150°C, add 2 parts by weight of clove essential oil from the next feed port, wherein the conditions of the twin-screw extruder are: the temperature of the first heating zone is 150°C, and the temperature of the second heating zone is 150°C. 160°C, the temperature of the third heating zone is 170°C, and the temperature of the fourth heating zone is 160°C;
[0028] (3) After granulation, add the polylactic acid antibacterial active packaging material made by film blowing machine blown film, blow the film at 160°C, the inflation ratio is 2:1, the traction ratio is 5:1, and the...
Embodiment 2
[0031] (1) Mix polylactic acid and polytrimethylene carbonate uniformly at a mass ratio of 8:2 and dry in a vacuum drying oven for 10 hours;
[0032] (2) Feed 100 parts by weight of polylactic acid and polytrimethylene carbonate obtained in step (1) from the first feed port of the twin-screw extruder, and transport them through the screw conveying section. After the trimethylene carbonate preheating temperature reaches 150°C, add 5 parts by weight of cinnamon essential oil from the next feed port to disperse the cinnamon essential oil and polymer mixture under the action of shear force, wherein the temperature of the first heating zone is 152 °C, the temperature of the second heating zone is 162 °C, the temperature of the third heating zone is 172 °C, and the temperature of the fourth heating zone is 162 °C;
[0033] (2) After granulation, add the polylactic acid antibacterial active packaging material made by film blowing machine, blow the film at 162°C, the inflation ratio i...
Embodiment 3
[0036] (1) Mix polylactic acid and polytrimethylene carbonate uniformly at a mass ratio of 7:3 and dry in a vacuum drying oven for 10 hours;
[0037](2) Feed 100 parts by weight of polylactic acid and polytrimethylene carbonate obtained in step (1) from the first feed port of the twin-screw extruder, and transport them through the screw conveying section. After the trimethylene carbonate preheating temperature reaches 150°C, add 10 parts by weight of lemongrass essential oil from the next feed port to disperse the lemongrass essential oil and polymer mixture under shear force, wherein the twin-screw extruder The conditions are: the temperature of the first heating zone is 150°C, the temperature of the second heating zone is 160°C, the temperature of the third heating zone is 170°C, and the temperature of the fourth heating zone is 160°C;
[0038] (3) After granulation, add the polylactic acid antibacterial active packaging material made by film blowing machine, blow the film a...
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