公开(公告)号：US4071479A

公开(公告)日：1978-01-31

申请号：US670469

申请日：1976-03-25

申请人： Barret Broyde ,  Judith Archer Delles ,  Steven Forrest North

发明人： Barret Broyde ,  Judith Archer Delles ,  Steven Forrest North

IPC分类号： C08J11/08 ,  C08J11/00 ,  C08J11/02 ,  C08J11/04

CPC分类号： C08J11/08 ,  C08J2327/06 ,  Y02W30/701

摘要： Recompoundable polyvinyl chloride suitable to be recompounded for reuse, for example, in cable and wire production is recovered from a scrap material which includes plasticized polyvinyl chloride. A charge of plasticized polyvinyl chloride scrap material is treated with a solvent such as methyl ethyl ketone, tetrahydrofuran, cyclohexanone or dimethyl formamide to form a solvent mixture with one component thereof being a solvent solution of dissolved vinyl chloride polymer and plasticizers. The mixture is heated and agitated and scrap metal and other gross solids, if present, are removed. Then the solvent mixture is treated with an acid which advantageously causes a flocculation of suspended insolubles such as pigments and fillers. Except when using cyclohexanone as the solvent, the treatment with the acid must be accomplished, unexpectedly, in the presence of an additional flocculating agent such as a cellulose acetate which is soluble in the solution and which is insolubilized by the acid on refluxing. Recompoundable polyvinyl chloride is precipitated out by a non-solvent for the polyvinyl chloride which is miscible with the solvent in substantially all proportions, which will dissolve the plasticizer. The solvent and the non-solvent are removed from the plasticizer and are recovered separately by fractional distillation, for example.

摘要翻译： 适用于重新混合再利用的可再生聚氯乙烯例如在电缆和电线生产中由包括增塑聚氯乙烯在内的废料回收。 用溶剂如甲基乙基酮，四氢呋喃，环己酮或二甲基甲酰胺处理塑化的聚氯乙烯废料，形成溶剂混合物，其中一种成分是溶解的氯乙烯聚合物和增塑剂的溶剂溶液。 将混合物加热并搅拌，并除去废金属和其它总固体（如果存在）。 然后用酸处理溶剂混合物，其有利地引起悬浮的不溶物如颜料和填料的絮凝。 除了使用环己酮作为溶剂之外，用酸处理必须意外地在另外的絮凝剂如醋酸纤维素的存在下进行，该溶解剂可溶于溶液中，并且在酸回流时不溶解。 可重复聚合的聚氯乙烯通过用于聚氯乙烯的非溶剂沉淀出来，其与溶剂以几乎所有比例混溶，这将溶解增塑剂。 从增塑剂中除去溶剂和非溶剂，例如通过分馏分开回收。

公开(公告)号：US4038219A

公开(公告)日：1977-07-26

申请号：US670470

申请日：1976-03-25

申请人： Vicky Williams Boehm ,  Barret Broyde

发明人： Vicky Williams Boehm ,  Barret Broyde

IPC分类号： C08J11/08 ,  C08J11/02 ,  C08J11/04

CPC分类号： C08J11/08 ,  C08J2327/06 ,  Y02W30/701

摘要： Recompoundable polyvinyl chloride suitable for reuse, for example, in cable and wire production is recovered from a scrap material which includes plasticized polyvinyl chloride. A charge of plasticized polyvinyl chloride scrap material is treated with a solvent to form a solvent mixture with one component thereof being a solvent solution of dissolved vinyl chloride polymer and plasticizers. The mixture is heated and agitated and scrap metal and other gross solids, if present, are removed. Then the solvent mixture is treated with an acid which advantageously causes a flocculation of suspended insolubles such as pigments and fillers. Except when using cyclohexanone as the solvent, the treatment with the acid must be accomplished, unexpectedly, in the presence of an additional flocculating agent. Suitable floccuating agents include liquid monomeric esters, which are effective only for cable and wire scrap, polystyrene, polymethyl methacrylate, poly (vinyl isobutyl ether), polyvinyl acetate and ethylene vinyl acetate, the latter acetate being effective only for scrap plastic such as extruder purgings.