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Abstract

The present application discloses a biodegradable polymer expended bead capable of being formed by steam compression molding, including the following components in parts by weight: 10-88 parts of PBS, 10-88 parts of PLA, 1-4 parts of a chain extender masterbatch, 1-3 parts of a nucleating agent masterbatch and 5-12 parts of a supercritical CO₂ foaming agent; wherein a concentration of optical isomer D-lactic acid monomer in a molecular chain of the PLA is 2-8%. The present application uses PBS and PLA as polymer matrixes, with an addition of a chain extender and a nucleating agent. The chain extender undergoes a chain extension reaction and a branching reaction with reactive end groups of PLA and PBS. The expended bead has good heat resistance, and can be formed using steam compression molding to obtain a steam compression molded product with good adhesion between beads and stable size.

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First Claim