申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0426023A1
公开(公告)日:1991-05-08
Removing chloroprene dimers from polychloroprene by feeding to a screw extruder a polychloroprene latex and coagulating the latex in the extruder, feeding the coagulated latex to a dewatering zone and discharging the coagulated polychloroprene through a flow restriction which heats and pressurizes the polychloroprene to an area of reduced pressure to form a porous crumb. Also, the flow restriction applies back pressure sufficient that the water in the polychloroprene is forced out of a vent port. The polychloroprene crumb discharged from the extruder is heated to strip chloroprene dimer therefrom.
将聚氯丁二烯二聚体从聚氯丁二烯中去除,方法是将聚氯丁二烯胶乳喂入螺杆挤出机,并在挤出机中使胶乳凝固,将凝固的胶乳喂入脱水区,然后将凝固的聚氯丁二烯通过限流装置排出,限流装置将聚氯丁二烯加热并加压至减压区,以形成多孔屑。 此外,限流装置施加的背压足以迫使聚氯丁烯中的水分从排气口排出。 挤出机排出的聚氯丁二烯碎屑经过加热,使聚氯丁二烯二聚体从中剥离。