Biaxially stretched biodegradable film
A biaxial stretching and biodegradation technology, which can be used in thin material processing, other household utensils, transportation and packaging, and can solve the problems of promoting the production of dioxins
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Embodiment 1
[0055] Polylactic acid (manufactured by Cargill-Dow Polymers LLC, trade name: EcoPLA4040D (Lot No. MJ0328P103)) with a weight average molecular weight of 200,000 and granular silica (product name : Sylysia 430) 1 part by weight is dried separately, after fully removing moisture, put it into a φ40mm co-direction twin-screw extruder, set at about 200°C to melt and mix, form a single strand, extrude, cool, and cut into grainy. The granules are used as a master mixture, dried again, mixed with 10% of the above-mentioned polylactic acid that is also dried, put into a φ40mm co-direction twin-screw extruder, and extruded into a sheet at a set temperature of 210°C. It was solidified by quenching in a rotating cooling drum, resulting in a substantially amorphous sheet.
[0056] The obtained sheet was heated with an infrared heater while in contact with warm water circulating rolls, stretched 3.0 times in the longitudinal direction at 77° C. between rolls having different circumferenti...
Embodiment 2
[0058] Except that the longitudinal stretching is stretched 2.7 times at 77°C, the transverse stretching is stretched 3.5 times at 76°C, and the heat treatment temperature is 125°C for 15 seconds, the same operation is carried out as in Example 1, and a film with a thickness of 40 μm is produced. . Table 1 shows the evaluation results of the obtained film.
Embodiment 3
[0060] Using polylactic acid with a weight average molecular weight of 200,000 (manufactured by Cargill-Dow Polymers LLC, trade name: EcoPLA4040D (Lot No. MJ0528P103)), the longitudinal stretch was stretched at 78°C by 3.0 times, and the transverse stretch was stretched at 77°C. 3.5 times, heat treatment at a heat treatment temperature of 120° C. for 15 seconds, and other operations were performed in the same manner as in Example 1 to form a film with a thickness of 40 μm. Table 1 shows the evaluation results of the obtained film.
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