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    • 5. 发明申请
    • Method for recycling polyurethane and a composition comprising recycled polyurethane
    • 聚氨酯回收方法和包含再循环聚氨酯的组合物
    • US20050096399A1
    • 2005-05-05
    • US10699569
    • 2003-10-30
    • Robert VillwockBryan MartelShayne Drivdahl
    • Robert VillwockBryan MartelShayne Drivdahl
    • B01F20060101C08J11/04
    • C08J3/122C08J3/097C08J11/08C08J2375/04Y02W30/701
    • The present invention comprises a method of recycling polyurethane-containing material. The method comprises combining a polyurethane-containing material with a solvent and forming a solution of the polyurethane-containing material and the solvent. Next, a non-solvent is added to the polyurethane solution to form a suspension of polyurethane in a solvent/non-solvent mixture. Finally, the solvent is removed to form a suspension of polyurethane in solvent. The solvent is preferably a polar, aprotic solvent. The solvent may be chosen from the group consisting of dimethylsulfoxide (DMSO), 1-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), acetonitrile, tetrahydrofuran (THF), hexamethylphosphoric acid triamide (HMPT) and mixtures thereof. The polyurethane-containing material may be chosen from the group consisting of foam trimmings, foam buns and foam skin, changeover blocks, off-specification material, polyurethane powder, molding mushrooms, fabrication scrap and post-consumer waste. In addition, the polyurethane-containing material may be prime polyurethane material. Finally a filtration step may be added to filter the solution before the non-solvent is added to form the suspension.
    • 本发明包括回收含聚氨酯材料的方法。 该方法包括将含聚氨酯的材料与溶剂组合并形成含聚氨酯的材料和溶剂的溶液。 接下来,向聚氨酯溶液中加入非溶剂以形成聚氨酯在溶剂/非溶剂混合物中的悬浮液。 最后,除去溶剂以形成聚氨酯在溶剂中的悬浮液。 溶剂优选为极性的非质子溶剂。 溶剂可以选自二甲基亚砜(DMSO),1-甲基-2-吡咯烷酮(NMP),N,N-二甲基甲酰胺(DMF),乙腈,四氢呋喃(THF),六甲基磷酸三酰胺(HMPT)和混合物 其中。 含聚氨酯的材料可以选自泡沫装饰物,泡沫塑料薄饼和泡沫皮肤,转换块,脱离规格的材料,聚氨酯粉末,成型蘑菇,制造废料和消费后废物。 此外,含聚氨酯的材料可以是主要的聚氨酯材料。 最后,可以加入过滤步骤以在加入非溶剂之前过滤溶液以形成悬浮液。