Twin-screw reactive extrusion method for preparing polylactic acid by ring-opening polymerization
A technology of ring-opening polymerization and reactive extrusion, which is applied to the preparation of polylactic acid by ring-opening polymerization of twin-screw reactive extrusion, and the preparation of polylactic acid by ring-opening polymerization of L-lactide, can solve problems such as poor heat resistance.
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Embodiment 1
[0023] (1) Sn(Oct) 2 And CH 3 (CH2) 11 OH is made into a solution with a total concentration of 0.15mol / L according to the molar ratio 1:3, and Ti[OCH(CH 3 ) 2 ] 4 Toluene was also used to prepare a 0.15 mol / L solution, and then a certain amount of the above-mentioned solution and 5 parts of antioxidant TPH-24 were added to L-lactide and mixed uniformly, and the system was removed by vacuum distillation at 70°C for 3 hours After containing the toluene, cool to room temperature, vacuum package, and set aside.
[0024] (2) Ring-opening polymerization of L-lactide
[0025] The ring-opening polymerization of L-lactide was carried out in a co-rotating twin screw extruder with a screw length-to-diameter ratio of 48:1. During the polymerization, the L-lactide mixed with the catalyst is added to the feed port of the extruder at a uniform speed under the protection of nitrogen gas, and vacuum is drawn at the exhaust port at the same time. During polymerization, the screw speed is controlle...
Embodiment 2
[0029] (1) Sn(Oct) 2 / P(C 6 H 5 ) 3 Prepare a solution with a total concentration of 0.15mol / L according to the molar ratio of 1:2, and add Ti[OCH(CH 3 ) 2 ] 4 Toluene was also used to prepare a 0.15 mol / L solution, and then a certain amount of the above-mentioned solution and 2 parts of antioxidant 1010 were added to L-lactide and mixed uniformly. Vacuum distillation was carried out at 70°C for 2 hours to remove the After toluene, cool to room temperature, vacuum package, and set aside.
[0030] (2) Ring-opening polymerization of L-lactide
[0031] The ring-opening polymerization of L-lactide was carried out in a co-rotating twin screw extruder with a screw length-to-diameter ratio of 48:1. During the polymerization, the L-lactide mixed with the catalyst is added to the feed port of the extruder at a uniform speed under the protection of nitrogen gas, and vacuum is drawn at the exhaust port at the same time. During polymerization, the screw speed is controlled at 120r / min, the mo...
Embodiment 3
[0035] (1) Sn(Oct) 2 And CH 3 (CH2) 11 OH is made into a solution with a total concentration of 0.15mol / L according to the molar ratio of 1:1, and Ti[OCH(CH 3 ) 2 ] 4 Toluene was also used to prepare a 0.15 mol / L solution, and then a certain amount of the above-mentioned solution and 5 parts of antioxidant TPH-24 were added to L-lactide and mixed uniformly, and the system was removed by vacuum distillation at 70°C for 3 hours After containing the toluene, cool to room temperature, vacuum package, and set aside.
[0036] (2) Ring-opening polymerization of L-lactide
[0037] The ring-opening polymerization of L-lactide was carried out in a co-rotating twin screw extruder with a screw length-to-diameter ratio of 48:1. During the polymerization, the L-lactide mixed with the catalyst is added to the feed port of the extruder at a uniform speed under the protection of nitrogen gas, and vacuum is drawn at the exhaust port at the same time. During polymerization, the screw speed is contro...
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