Nano composite soy protein plastic and preparation method thereof

The invention relates to a nano composite soy protein plastic and a preparation method thereof. The nano composite soy protein plastic is prepared by the following steps: with soy isolate protein as a base material, dialdehyde polysaccharide with the aldehyde content of 5%-80% as a cross-linking agent, and amino nano clay as a nano filler, adding a plasticizer which is 10%-30% of dry weight of the soy isolate protein and a certain amount of deionized water; carrying out hot-pressing by using a hot press at 80-140 DEG C and 5-50MPa for 3-30 minutes. The nano composite soy protein plastic prepared by the method has relatively high water resistance, mechanical property and heat stability, is an environment-degradable high-strength protein plastic, and has a wide application prospect in the fields such as biological materials, foods and medicine packaging.