利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

1612 条记录 (耗时 0.029 秒)

    Extrusion process for grafting rubbers
    8.
    发明公开
    Extrusion process for grafting rubbers 审中-公开
    Strangpressverfahren zur Pfropfung von Gummis

    公开(公告)号：EP2617744A1

    公开(公告)日：2013-07-24

    申请号：EP13151204.8

    申请日：2008-12-01

    申请人： Lanxess Elastomers B.V.

    发明人： Meessen, Patric ,  Houtvast, Franciskus Victoire Paulus ,  Geesink, Johannes Hendrik ,  Qiu, Jun ,  Olivier, Errol Joseph

    IPC分类号： C08F255/04 ,  B29C47/00 ,  B29C47/78 ,  C08F255/00 ,  C08F255/02

    CPC分类号： C08F255/04 ,  B29C47/0011 ,  B29C47/822 ,  B29C47/8895 ,  C08F255/00 ,  C08F255/02 ,  C08F291/00

    摘要： The invention relates to a process for producing a grafted rubber comprising:
    a) providing an ethylene propylene rubber having a weight average molecular weight (Mw) of at least 80 kg/mol in a continuous extrusion reactor by feeding the rubber in a slab/melt dosing unit and transporting the rubber to the continuous extrusion reactor by a melt pump;
    b) drying the rubber in the continuous extrusion reactor to a moisture content of between about 0.2 and about 0.5 wt%;
    c) providing the dried rubber to a first injection zone of the continuous extrusion reactor at a temperature of between 190 and 250°C;
    d) in the first injection zone, providing successively a first amount of maleic anhydride and a first free-radical initiator to the dried rubber;
    e) reacting maleic anhydride with the rubber in a first reaction zone of the continuous extrusion reactor to produce a grafted rubber;
    f) in a second injection zone, providing successively a second amount of maleic anhydride and a second free-radical initiator, the first and the second free radical initiator is an organic peroxide with a half-life (t ½ ) of more than 1 second if measured in mono-chlorobenzene at 220°C.
    g) applying shear to the grafted rubber in a second reaction zone of the continuous extrusion reactor, the shear sufficient to reduce the weight average molecular weight (Mw) of the grafted rubber by a factor of at least 2.

    摘要翻译： 本发明涉及一种生产接枝橡胶的方法，包括：a）在连续挤出反应器中通过将橡胶进料在板/熔体中，提供重均分子量（Mw）至少为80kg / mol的乙丙橡胶 并将橡胶通过熔体泵输送到连续挤出反应器; b）将连续挤出反应器中的橡胶干燥至约0.2至约0.5重量％的水分含量; c）在190-250℃的温度下将干燥的橡胶提供给连续挤出反应器的第一注射区; d）在第一注射区中，连续向干燥橡胶提供第一量的马来酸酐和第一自由基引发剂; e）在连续挤出反应器的第一反应区域中使马来酸酐与橡胶反应以制备接枝橡胶; f）在第二注射区域中，连续提供第二量的马来酸酐和第二自由基引发剂，第一和第二自由基引发剂是半衰期（t 1/2）大于1秒的有机过氧化物 如果在220℃的单氯苯中测量。 g）在连续挤出反应器的第二反应区中对接枝橡胶施加剪切力，剪切力足以将接枝橡胶的重均分子量（Mw）降低至少2倍。