The present invention provides a method for preparing a fully biodegradable starch-based plastic masterbatch, comprising the steps of: uniformly mixing starch, substance A, and a lubricant to obtain a starch additive mixture, which is then fed into a twin-screw extruder via the main feed; the mass ratio of starch to substance A is 100:1 to 20:1; wherein substance A is a plasticizer, or a mixture of a plasticizer and a co-plasticizer; using an internal mixer to mix biodegradable polyester, polyol, and chain extender in a mass ratio of 100:1 to 10:0.1 to 5 to obtain a polyhydroxy-branched polyester, which is then fed into the twin-screw extruder via a single-screw side feed to mix with the starch additive mixture; The material is extruded through the twin-screw extruder, then undergoes stranding, air cooling, and pelletizing to produce fully biodegradable starch-based plastic masterbatch. This invention features a simple preparation method that reduces the plasticizer required for starch plasticization, minimizes fumes generated during downstream processing, and decreases the greasy feel on the surface of the finished product.
Country Code: CN
Application Number: CN202111508497.4
