Polyhydroxylkanoates as well as blending modification for copolymer thereof and polylactic acid
A technology of polyhydroxyalkanoate and copolymer, which is applied in the field of blending modification of polyhydroxyalkanoate and its copolymer with polylactic acid, which can solve the problem of low elongation at break, insufficient toughness and tear resistance of PLA , Use of performance changes and other issues
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Embodiment 1
[0040] Weigh 10 kg of PHBV (15% HV) for industrial use and 90 kg of PLA, and stir in a mixer at room temperature for 8 minutes to obtain a raw material mixture of fully biodegradable plastics. Place the stirred mixture in an electric blast drying oven at 70°C to dry for 10 hours, then extrude the above-mentioned dried mixture with a 65 twin-screw extruder with a length-to-diameter ratio of 40:1, and the die temperature is 150 ℃, direct granulation after extrusion to obtain a fully biodegradable plastic masterbatch. The properties of the blended materials are shown in Table 1.
[0041] The blend can be directly processed into injection molded parts on a traditional injection molding machine, and can be produced at an industrial rate. The product has good processability, good strength and certain toughness, and can meet the requirements of use.
Embodiment 2
[0043] Weigh 10kg P3HB4HB (16% 4HB) and 5kg PHBV (15% HV) and 85kg PLA for industrial use, and stir in a mixer at room temperature for 8 minutes to obtain a raw material mixture of fully biodegradable plastics. Place the stirred mixture in an electric blast drying oven at 70°C to dry for 10 hours, then extrude the above-mentioned dried mixture with a 65 twin-screw extruder with a length-to-diameter ratio of 40:1, and the die temperature is 145 ℃, direct granulation after extrusion to obtain a fully biodegradable plastic masterbatch. The properties of the blended materials are shown in Table 1.
[0044] The blend can directly produce fully biodegradable sheets with a thickness of less than 0.7mm on traditional casting equipment. The sheets can be produced and rolled at an industrial rate, which can meet the requirements of use and can be further processed Wait for processing.
Embodiment 3
[0046] Weigh 20 kg of P3HB4HB (16% 4HB) and 80 kg of PLA for industrial use, and stir in a mixer at room temperature for 8 minutes to obtain a raw material mixture of fully biodegradable plastics. Place the stirred mixture in an electric blast drying oven at 70°C to dry for 10 hours, then extrude the above-mentioned dried mixture with a 65 twin-screw extruder with a length-to-diameter ratio of 40:1, and the die temperature is 140 ℃, direct granulation after extrusion to obtain a fully biodegradable plastic masterbatch. The properties of the blended materials are shown in Table 1.
[0047] The blend can be blown directly on traditional bottle blowing equipment. The product has good molding effect and good gloss on the surface, and can be used for packaging of daily chemical products and drinking water containers.
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