Fully biodegradable foam cushioning packaging material and manufacturing method thereof

A fully biodegradable foam cushioning packaging material comprising 80-90.2% starch by weight, 1-7.4% polyvinyl alcohol, 1-3.2% low molecular weight polyamide resin, 1-1.3% inorganic compound Nucleating agent, 1.2-1.5% fiber nucleating agent, foaming agent is water, starch used is corn starch, potato starch, wheat starch or tapioca starch, particle size is between 80-300 mesh, polyethylene used Alcohol is fully hydrolyzed ultra-fine polyvinyl alcohol, particle size greater than 20 mesh, viscosity range 0.005-0.065Pa.s/20°C; low molecular weight polyamide resin, viscosity range 50-500mPa.s/25°C, foaming The agent is water.

The invention relates to a completely biodegradable foam cushioning packaging material and a preparation method thereof. It is mainly used to solve the white pollution caused by the extensive use of foamed polystyrene. Its characteristic is that more than 80% of the starch is used as a substrate, superfine polyvinyl alcohol is used as a film forming enhancer, water is used as a foaming agent, and is supplemented by a nucleating agent and a flow modifier. The mixture was mixed by a homomixer and fed into a co-rotating twin-screw extruder having an aspect ratio of 44. The mixture was extruded at a single screw speed of 150-400 rpm. This product is suitable for replacing foamed polystyrene with no shape required for filling.