Preparation method of maleated rosin urea compound toughened thermoplastic starch plastic

The invention relates to a preparation method of maleated rosin urea compound toughened thermoplastic starch plastic, and belongs to the field of biodegradable high polymer materials. The method comprises the following steps: reacting urea with maleated rosin to obtain a maleated rosin urea compound, blending the maleated rosin urea compound with starch and urea, and extruding through an extruder to obtain the toughened thermoplastic starch plastic based on the maleated rosin urea compound. According to the thermoplastic starch plastic, the elongation at break (fracture toughness) of the thermoplastic starch plastic can be effectively improved under the condition that the addition amount of the maleated rosin urea compound is small (0.5-2 parts) (based on 100 parts of starch), and meanwhile, stable and high tensile strength is kept; in addition, the whole material can still be completely biodegraded, and is expected to be applied to the fields of packaging, disposable tableware and other disposable consumable