BIODEGRADABLE THERMOPLASTIC MOULDING AND EXTRUSION COMPOUNDS MADE FROM BIOMASS

摘要

The present invention is directed to a method of making thermoplastic granulates. A comminuted biomass is mixed with a lignin swellant such that the content of substances soluble in diethyl ether is at least 3.0% and ground and processed in a compounding extruder equipped with compaction, heating, cooling venting and grinding zones to form thermoplastic dry blends and granulates.

主权项

1. A method of making biodegradable, mouldable and extrudable thermoplastic granulates and dry blends comprising the steps of:
a) providing a biomass containing at least 20% moisture wherein at least 90% of the particles are smaller than 25 mm; b) adding from between 1.0 wt. % to 8.0 wt. % of a lignin swellant to form a mixture; c) heating the mixture in a vented compounding extruder equipped to heat, cool, grind and compact, such that the temperature in the compaction zones is at least 125° C. and the residence time there at least 1 minute, to make treated particles smaller than 1 mm in size. d) ejecting the extrudate through a die as a powder or through a multiorifice die plate as strands