挤出工艺对超临界二氧化碳发泡聚丙烯泡孔形态的影响

2632CO2CO2CO11.1T30sDaplayTMHMS1302CO99.50.8m1.2T30sDaplayTMHMS1305ZSK25-WLEMaag12641.1.3GB1033-860.01mg5CambridgeStereoscan250MK3[1]22.12mm10mm1//r/minbarkg/h165181184184170165158150143150270100250//wt%//MPa1511501461107.510211.51232656.06.57.07.58.08.50.030.040.050.060.070.080.09apparentdensity(g/cm3)pressure(MPa)727476788082842.00E+0074.00E+0076.00E+0078.00E+0071.00E+0081.20E+0081.40E+008celldensitycelldiameterpressure(bar)celldensity(cells/cm3)455055606570celldiameter()23[2][3]r1507.5wt%6.0MPa1mm10mm415MPa1516171819200.0100.0150.0200.0250.0300.0350.0400.0450.050apparentdensity(g/cm3)pressure(MPa)41mm2662.2/5SEM160135a-160b-1355SEM2.32CO1mm270rpm13514015MPa2CO2CO32COwt2CO(kg/h)PP267468100.0350.0400.0450.0500.0550.0600.0650.070CO2%wt5.25.45.65.86.06.26.46.2CO7.2CO7.7wtSEM620wtSEM72CO7.7%wtSEM100mµ[4]32CO12mm6.0Mpa8.5Mpa2125150315wt%[1]NaguibHE,ParkCB,PanzerU,etal.PolymEngSci,2002,42:1481[2][M].1988510512268[3]().(J),2005(3):11-16[4]..[J]200522226ProcessInvestigationonExtrusionofPolypropyleneFoamswithSupercritical2COinaCo-rotatingTwin-screwExtruderAbstract:Extrusionofblendedandmodifiedpolypropylenefoamswithsupercritical2COwaswellconductedinaco-rotatingtwin-screwextruder.Theimportantprocessingparametersoffoamingextrusionwereinvestigated,mainlysuchasmelttemperature,concentrationofsupercritical2COanddiepressure.Theresultsshowthatmelttemperatureshouldbeaslowaspossibleprovidedtheextruderrunningproperly;Celldensityofthefoamproductswasincreasedwiththeincreasingof2CO.Thereisasuitableconcentrationofblowingagentforpolypropylenefoamingextrusion;Moreover,celldensitywasincreasedbytheincreasingofdiepressure.Keywords:Co-rotatingTwin-screwExtruderSupercritical2COFoamsPolypropylene