Plastic-based binding agent and method for preparing powder injection molding green bodies through same

The invention discloses a plastic-based binding agent and a method for preparing powder injection molding green bodies through the same. The plastic-based binding agent is prepared from, by weight, 75-88% of polyoxymethylene, 4-10% of modified polylactic resin, 3-10% of microcrystalline wax, 2-8% of pentaerythritol stearate, 1-10% of sebacic acid dibutyl ester and 0.5-2% of an antioxidant. The method for preparing powder injection molding green bodies through the plastic-based binding agent comprises the steps that metal or ceramic powder is preheated and stirred; the binding agent is added and banbury mixing is performed; after banbury mixing is performed, extrusion and pelleting are performed to obtain granular feed; injection molding of the granular feed is performed; green bodies obtained through injection molding are catalyzed and degreased through nitric acid, and the powder injection molding degreased green bodies are obtained. The adopted plastic-based binding agent is low in viscosity and good in flo