China Plastics ›› 2019, Vol. 33 ›› Issue (7): 117-129.DOI: 10.19491/j.issn.1001-9278.2019.07.019

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Research Progress in Preparation of Microcellular PVC Foamed with Supercritical CO2

  

  • Received:2019-01-23 Revised:2019-03-06 Online:2019-07-26 Published:2019-07-26

Abstract: This paper overviewed the foaming technology for preparation of microcellular polyvinyl chloride (PVC) using supercritical carbon dioxide (CO2) as physical blowing agent and introduced the dissolution and diffusion behaviors of CO2 in PVC and the effect of high CO2 plasticization on PVC. The different PVC foaming processes including batch step temperature rising foaming process, batch rapid depressurization foaming process and continuous extrusion foaming process were discussed, and both advantages and disadvantages of each process are analyzed. The effects of foaming condition and PVC formula composition on the cell morphology and mechanical properties of the foamed samples were also analyzed in detail. The industrial applications of microcellular PVC foamed with supercritical CO2 were prospected.