| abstract |
A physical foaming method for directly forming a foamed product in a mold, the raw material is a rubber particle of an elastomer or a rubber particle of a polyolefin composition, and the physical foaming method comprises the following steps: (1) If the raw material is a polyolefin composition If the raw material is the rubber particle of the elastomer, then directly carry out step (2); (2) put the raw material into the mold with through holes, and then put the mold into the pressure In the autoclave, high-pressure infiltration is carried out with supercritical fluid, and the supercritical fluid infiltrates the raw material through the through holes of the mold to obtain a semi-finished product infiltrated by supercritical fluid; (3) the pressure of the autoclave is released, and the semi-finished product is directly in the mold. Carry out 1:1 foaming to obtain a finished foamed product. In the present invention, the supercritical fluid high-pressure infiltration and foaming processes are carried out in sequence directly in the mold, without transferring the semi-finished product, and the technical effects of reducing the difficulty of the process and improving the production efficiency can be achieved at the same time. |