Polylactic acid modified material and preparation method thereof
A modified material, polylactic acid technology, which is applied in the field of materials, can solve the problems of reduced tensile strength and unsatisfactory toughening results, etc., and can increase elongation at break, improve tensile strength and glass transition temperature, and the method is simple easy-to-use effects
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Embodiment 1
[0031] 1) Take 8 kg of PEGA with a number-average molecular weight of 1800 and 1.824 kg of isocyanate (MDI) in a reaction kettle. After mixing evenly, keep the system at 85°C and keep it warm for 2 hours; then cool the system down to 60°C and stir. Add 0.176kg alcohol chain extender (EG), mix evenly, heat up to 70°C for 5h, heat the reaction for 5h, take out the reaction material, and mature it in an oven at 120°C for 4h to obtain TPU; the hard segment of the obtained TPU is The mass ratio in the TPU is 20%, the mass ratio of the soft segment in the TPU is 80%, and the melt index of the TPU obtained is 8g / 10min (under the test condition of 190°C / 2.16kg, the same below);
[0032] 2) Take 2.0kg of TPU prepared in step 1) and 8.0kg of PLA with a melt index of 2g / 10min and 0.02kg of BASF chain extender ADR-4385 and mix evenly, and the resulting mixture is placed in a twin-screw extruder for melting Blending, extruding (200°C), and cooling by a cooling roll at 40°C to obtain a poly...
Embodiment 2
[0055] 1) Take 9kg of PEGA with a number-average molecular weight of 2500 and 0.974kg of isocyanate (MDI) in a reaction kettle. After mixing evenly, keep the system at 85°C and keep it warm for 2 hours; then cool the system down to 60°C and stir. Add 0.026kg of alcohol chain extender (BD), mix evenly, raise the temperature to 70°C and keep it warm for 5 hours, take out the reaction material, and mature it in an oven at 120°C for 4 hours to obtain TPU. The hard segment of the obtained TPU is The mass ratio that accounts for in TPU is 10%, and the mass ratio that soft segment accounts for in TPU is 90%, and the melt index of gained TPU is 11g / 10min;
[0056] 2) Take 2.0kg of TPU prepared in step 1) and 8.0kg of PLA with a melt index of 6g / 10min and 0.03kg of BASF chain extender ADR-4300 and mix evenly, and place the resulting mixture in a twin-screw extruder for melting Blending, extruding (200°C), and cooling by a cooling roll at 40°C to obtain a polyurethane / polylactic acid sh...
Embodiment 3
[0071] 1) Take 8.5kg of PEGA with a number average molecular weight of 2500 and 1.371kg of isocyanate (MDI) in a reactor, mix well, keep the system at 90°C, and keep it warm for 2 hours; then cool the system down to 60°C, stirring Add 0.129kg of alcohol chain extender (EG), mix evenly, heat up to 70°C for 4h, heat the reaction for 4h, take out the material obtained from the reaction, and mature it in an oven at 120°C for 4h to obtain TPU; the obtained TPU medium hard segment The mass ratio that accounts for in TPU is 15%, and the mass ratio that soft segment accounts for in TPU is 85%, and the melting index of gained TPU is 18g / 10min;
[0072] 2) Take 2.0kg of TPU prepared in step 1), mix 8.0kg of PLA with a melt index of 10g / 10min and 0.015kg of BASF chain extender whose model is ADR-4370S, and place the resulting mixture in a twin-screw extruder for melting Blending, extruding (180°C), and cooling by a cooling roll at 35°C to obtain a polyurethane / polylactic acid sheet.
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