STARCH-BASED FULLY-BIODEGRADABLE MATERIALS AND THEIR PREPARATION PROCESS

摘要

The present invention relates to a starch−based fully−biodegradable material which comprises 65−95wt% plant starch, 1−15wt% reactive plasticizer, 0.1−5wt% reactive compatibilizer, 1−20wt% biodegradable polymer. The preparation process of the starch−based fully−biodegradable material is as follows: 1) adding the plant starch and said reactive plasticizer to a high speed mixer to mix; 2) when its temperature rises to 80−200°C, adding degradable polymer thereto; 3) cooling and discharging the material to obtain powder; 4) then adding said powder to a twin screw extruder, adding said reactive compatibilizer thereto at 120−130°C, and extruding this sheet, polishing, cooling and sizing, thereby completing the invention. After discarding, the fully−biodegradable material according to the invention can be composted or used as mediums for soiless culture. It can be used to manufacture disposable tableware, packing container and vibration−damping filler and the like.