VERFAHREN ZUR KONTINUIERLICHEN HERSTELLUNG VON NANOPORÖSEN POLYMERSCHAUMSTOFFEN
    92.
    发明公开
    VERFAHREN ZUR KONTINUIERLICHEN HERSTELLUNG VON NANOPORÖSEN POLYMERSCHAUMSTOFFEN 有权
    PROCESS FOR纳米多孔聚合物泡沫材料连续生产

    公开(公告)号:EP2782735A1

    公开(公告)日:2014-10-01

    申请号:EP12786991.5

    申请日:2012-11-15

    Applicant: BASF SE

    Abstract: The invention relates to a method for continuously producing nanoporous polymer foam materials, involving the following steps: a) producing a polymer melt from thermoplastic polymer and building up pressure in a single-screw extruder with a grooved barrel or in a twin-screw extruder with a downstream-connected gear pump to a pressure in the range of 20 to 200 MPa; b) loading the polymer melt with a blowing agent in a zone down-stream of the pressure build-up, which zone comprises mixing elements, at a temperature and at a pressure at which the blowing agent is in the supercritical state; c) controlling the temperature of the loaded polymer melt using cooling elements to a temperature in the range of 40
    o C below to 40
    o C above the glass transition temperature of the unloaded polymer melt, the glass transition temperature being determinable by means of DSC in accordance with DIN-ISO 11357-2 at a heating rate of 20 K/min; d) releasing the pressure of the polymer melt that was loaded in step b) and the temperature of which was controlled in step c) using a nozzle or nozzle plate at a pressure release rate in the range of 15,000 to 2,000,000 MPa/sec. The method also relates to the nanoporous polymer foam materials that can be obtained according to the method and have a cell count in the range of 1,000 to 100,000 cells/mm and a density in the range of 10 to 500 kg/m
    3 .

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