Preparation method of ductile substrate material

The invention provides a preparation method of a ductile substrate material. The preparation method specifically comprises the following steps of drying periostracum cicadae to be at the constant weight and then crushing the periostracum cicadae to obtain periostracum cicadae powder; transferring the periostracum cicadae powder into a mixed solution of sodium iminodisuccinate, potassium persulfateand hydrogen peroxide, carrying out sealing, heating and continuous stirring, filtering a product, and washing filter residues with deionized water to be neutral; transferring the filter residues into an acetic acid solution, carrying out grinding and ultrasonic treatment, carrying out centrifuging to obtain supernate; and diluting the supernate with the deionized water, and evaporating part of the water to prepare hydrogel. The ductile substrate material is prepared by taking the periostracum cicadae as raw materials, performing treatment by a specific physicochemical method to obtain a novel nanoscale and degradabl