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1. 发明申请

US20030067089A1 Method for removing water and other volatile components from polymer powders 有权
标题翻译：从聚合物粉末中除去水和其他挥发性成分的方法
公开(公告)号：US20030067089A1
公开(公告)日：2003-04-10
申请号：US09942066
申请日：2001-08-29
申请人： General Electric Company
发明人： Hua Wang , Eric Thomas Gohr
IPC分类号： B29C047/38 , B29C047/40 , B29C047/60 , B29C047/76 , B29C047/80 , B29C047/82
CPC分类号： B29C47/0825 , B29C47/0009 , B29C47/0808 , B29C47/40 , B29C47/60 , B29C47/76 , B29K2069/00 , C08G64/406
摘要： A method for removing volatile components from wet, polymer powders using a vacuum vented extruder is described. Polymer powders containing substantial amounts of water, 1-20% by weight, are rapidly converted to polymer compositions containing less than about 0.5% by weight water at high throughput rates while avoiding complications resulting from excessive steam backflow through the extruder feed throat. The method provides a screw design comprising a powder seal section upstream of kneading and melting sections of the extruder. Steam generated as the polymer is heated flows downstream to one or more vacuum vents for removal. The partially devolatilized polymer melt is then subjected to additional melt kneading and vacuum venting. The method converts wet polycarbonate powder containing residual methylene chloride to essentially dry polycarbonate powder containing less than about 1 ppm methylene chloride.
摘要翻译：描述了使用真空排气挤出机从湿聚合物粉末中除去挥发性组分的方法。含有相当量1-20％（重量）的水的聚合物粉末可快速转化为含有低于约0.5％（重量）水的聚合物组合物，同时避免由挤压机进料喉部过量蒸汽回流引起的并发症。该方法提供了一种螺杆设计，其包括在挤出机的捏合和熔化部分上游的粉末密封部分。当聚合物被加热时产生的蒸汽向下游流动到一个或多个真空通风口以便去除。然后对部分脱挥发分的聚合物熔体进行额外的熔融捏合和真空排气。该方法将含有残余二氯甲烷的湿聚碳酸酯粉末转化成含有少于约1ppm二氯甲烷的基本上干燥的聚碳酸酯粉末。

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