Long chain branched polylactic acid grafted by free radicals of melt and preparation method thereof
A technology of branched polylactic acid and free radicals, which is applied in the field of melt free radical grafted long-chain branched polylactic acid and its preparation, can solve the problems of low crystallinity of linear polylactic acid, limiting the application of polylactic acid, and slow crystallization rate. Achieve short reaction time, shorten processing cycle, and improve physical properties
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Embodiment 1
[0025] (1) Dry the PLA at 50°C for 24 hours;
[0026] (2) Mix 80 parts of PLA after drying with 0.05 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, tris(2.4-di-tert-butyl-phenyl ) 0.05 parts of phosphite, 0.1 parts of DCP, 6 parts of PETA, added to a high-speed mixer with a rotation speed of 100r / min and stirred for 10 minutes to form a mixed material;
[0027] (3) Put the mixed material into the hopper of the twin-screw extruder, melt, extrude, pelletize, water cool, pelletize and dry the obtained product. Among them, the temperature and screw speed of each zone of the twin-screw extruder are respectively: the temperature of the first zone is 70°C, the temperature of the second zone is 120°C, the temperature of the third zone is 170°C, the temperature of the fourth zone is 170°C, the temperature of the fifth zone is 170°C, and the temperature of the sixth zone is 170°C. The head temperature is 170°C; the screw speed is 180r / min.
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Embodiment 2
[0030] (1) Dry the PLA at 80°C for 28 hours;
[0031] (2) Mix 100 parts of PLA after drying with 0.25 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, tris(2.4-di-tert-butyl-phenyl ) 0.25 parts of phosphite, 0.5 parts of DCP and 10 parts of PETA, added to a high-speed mixer with a rotation speed of 100r / min and stirred for 12 minutes to form a mixed material;
[0032] (3) Put the mixed material into the hopper of the twin-screw extruder, melt, extrude, pelletize, water cool, pelletize and dry the obtained product. Among them, the temperature and screw speed of each zone of the twin-screw extruder are respectively: the temperature of the first zone is 100°C, the temperature of the second zone is 180°C, the temperature of the third zone is 230°C, the temperature of the fourth zone is 230°C, the temperature of the fifth zone is 230°C, the temperature of the sixth zone is 230°C, The head temperature is 200°C; the screw speed is 300r / min. ...
Embodiment 3
[0035] (1) Dry PLA at 65°C for 26 hours;
[0036] (2) Combine 90 parts of dried PLA with 0.15 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, tris(2.4-di-tert-butylphenyl) ) 0.15 parts of phosphite, 0.3 parts of DCP and 8 parts of PETA, added to a high-speed mixer with a rotation speed of 100r / min and stirred for 11 minutes to form a mixed material;
[0037] (3) Put the mixed material into the hopper of the twin-screw extruder, melt, extrude, pelletize, water cool, pelletize and dry the obtained product. Among them, the temperature and screw speed of each zone of the twin-screw extruder are respectively: the temperature of the first zone is 90°C, the temperature of the second zone is 150°C, the temperature of the third zone is 200°C, the temperature of the fourth zone is 200°C, the temperature of the fifth zone is 200°C, and the temperature of the sixth zone is 200°C. The head temperature is 185°C; the screw speed is 240r / min.
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