Polylactic acid-starch foaming material and preparation method thereof
A foaming material, polylactic acid technology, applied in the field of foaming materials, can solve the problems of poor mechanical properties, low foaming rate of foaming materials, high cost, etc., achieve good mechanical strength and water resistance, improve mixing effect, increase The effect of foam rate
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Embodiment 1
[0019] 2 kg of L-polylactic acid, using co-rotating twin-screw extruder at 180°C-180°C-180°C-160°C-140°C temperature distribution, screw length 700mm, speed 120rpm, fully melted and cooled to 140 ℃. Add 20% moisture (based on starch) to 2 kilograms of starch. In another twin-screw extruder, the temperature distribution is 80°C-120°C-140°C-140°C, the screw length is 700mm, and the rotating speed is 120rpm. After gelatinization, the aforementioned molten polylactic acid is introduced into another twin-screw extruder. Each temperature zone of the extruder is controlled at 140°C. A high-efficiency mixing element is installed in the extruder. After the materials are mixed, they pass through a 4mm diameter The circular die mouth is directly puffed, and the puffed product is cut into a length of about 50mm by a rotary blade, and the puffing ratio and water absorption are measured after drying at a temperature of 60°C.
Embodiment 2
[0021] 2 kg of L-polylactic acid, fully melted and moderately cooled to 140°C. Add 20% water (based on starch dry basis) to 1 kg of starch in another similar twin-screw extruder under the temperature distribution of 80°C-120°C-140°C-140°C, the screw length is 700mm, and the rotation speed is 120rpm. , after fully gelatinized, the aforementioned molten polylactic acid is introduced into another twin-screw extruder, and each temperature zone of the extruder is controlled at 140°C. A high-efficiency mixing element is installed in the extruder. After the materials are mixed, they pass through a diameter It is a 4mm circular die, directly puffed, and the puffed product is cut into a length of about 50mm by a rotary blade, and its expansion ratio and water absorption are measured after drying at a temperature of 60°C.
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Abstract
Description
Claims
Application Information
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