Polylactic acid polymer composition for thermoforming, polylactic acid polymer sheet for thermoforming, and thermoformed object obtained therefrom
一种聚乳酸聚合物、聚合物的技术，应用在热成型制品领域，能够解决易碎、很难使用等问题
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preparation Embodiment 1
[0133] 100 kg of L-lactide manufactured by Purac Japan (trade name: PURASORB L) and 15 ppm of tin octoate added were charged into a 500-liter batch polymerization tank equipped with a stirrer and a heater. In the polymerization tank, after nitrogen substitution, L-lactide was polymerized at 185° C. for 60 minutes while stirring at a speed of 100 rpm. The molten product thus obtained was supplied to a parallel twin-screw extruder (manufactured by Mitsubishi Heavy Industries, Ltd.) having a diameter of 40 mm and including vacuum vents in three stages, and then vented at a vent pressure of 4 Torr Simultaneously with this, the product was extruded in the form of strands at 200°C. The strands are then pelletized.
[0134] The polylactic acid polymer thus obtained (hereinafter referred to as "B1") had a weight-average molecular weight of 200,000, and its L-lactic acid content was 99.5%. The melting point measured by DSC method was 171°C.
preparation Embodiment 2 and 3
[0136] 94 kg of L-lactide (trade name: PURASORB L) and 6 kg of DL-lactide (trade name: Purasorb DL), both manufactured by Purac Japan, were charged with 15 ppm of tin octoate added in a stirrer and heater in the 500-liter batch polymerization tank. In the polymerization tank, after nitrogen substitution, the mixture was polymerized at 185° C. for 60 minutes while stirring at a speed of 100 rpm. The molten product thus obtained was supplied to a parallel twin-screw extruder (manufactured by Mitsubishi Heavy Industries, Ltd.) having a diameter of 40 mm and including vacuum vents in three stages, and then vented at a vent pressure of 4 Torr. Simultaneously, the product was extruded in the shape of strands at 200°C. The strands are then pelletized.
[0137] The polylactic acid polymer thus obtained (hereinafter referred to as "B2") had a weight-average molecular weight of 200,000, and its L-lactic acid content was 97.0%. The melting point measured by DSC method was 168°C.
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preparation Embodiment 4 and 5
[0140] 80 kg of L-lactide (trade name: PURASORB L) and 20 kg of DL-lactide (trade name: PURASORB DL), both of which are manufactured by Purac Japan, were charged with 15 ppm of tin octoate added in a tank with a stirrer and a heater 500 liter batch type polymerization tank. In the polymerization tank, after nitrogen substitution, the mixture was polymerized at 185° C. for 60 minutes while stirring at a speed of 100 rpm. The molten product thus obtained was supplied to a parallel twin-screw extruder (manufactured by Mitsubishi Heavy Industries, Ltd.) having a diameter of 40 mm and including vacuum vents in three stages, and then vented at a vent pressure of 4 Torr. Simultaneously, the product was extruded in the shape of strands at 200°C. The strands are then pelletized.
[0141] The polylactic acid polymer thus obtained (hereinafter referred to as "A1") had a weight-average molecular weight of 200,000, and its L-lactic acid content was 89.7%.
[0142] A polylactic acid poly...
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