The invention discloses a supercritical foaming PHA / PBAT
composite material as well as a preparation method and application thereof. The
composite material comprises the following components in parts by weight: 60-90 parts of polyhydroxyalkanoate; 10 to 40 parts of poly (
adipic acid) / butylene terephthalate; 0.5 to 2.0 parts of a chain
extender; 0.2 to 0.8 part of a self-
assembly nucleating agent; and 0.1 to 0.5 part of an anti-
hydrolysis agent. The preparation method comprises the following steps: mixing the components, melting, mixing and extruding, carrying out
underwater pelletizing to obtain modified particles,
drying, and carrying out supercritical foaming to obtain the foaming material. The obtained foaming material is bonded with beads through a steam forming technology, the degradable thin-wall plastic cup with the heat insulation performance is prepared, and the problem that in the foaming process of an existing material, phase separation is likely to happen, the
cell density is low, and the product particle size is large, so that the thin-wall plastic cup is difficult to form is solved.