BIODEGRADABLE COMPOSITION, AND PREPARATION METHOD AND USE THEREOF

摘要

PURPOSE: A biodegradable composition, its preparation method and its use as a packaging bag are provided, wherein the composition shows a favorable biodegradability and an additional fertilizer effect. CONSTITUTION: The biodegradable composition comprises 10-90 parts by weight of yeast; and 10-90 parts by weight of a biodegradable plastic. Optionally the composition comprises further 40 parts by weight or less of lignin based on 100 parts by weight of the yeast. The method comprises the steps of melting the mixture of the yeast and the biodegradable plastic at a temperature above the melting point of the biodegradable plastic; and mixing them. Preferably the melting and mixing are carried out in the presence of 3-20 wt% of moisture. The plastic packaging bag comprises the plastic film with a thickness of 10-250 micrometers, prepared from the composition.