AQUEOUS EMULSION OF MODIFIED POLYTETRAFLUOROETHYLENE, FINE POWDER AND METHOD FOR PRODUCING STRETCHED POROUS BODY
申请人:Asahi Glass Company, Limited
公开号:EP3339330A1
公开(公告)日:2018-06-27
To provide a production method for an aqueous emulsion of modified polytetrafluoroethylene which is environmentally friendly and which is suitable for producing a stretched porous body having excellent breaking strength. A production method for an aqueous emulsion of modified polytetrafluoroethylene, which is a method to obtain an aqueous emulsion of modified polytetrafluoroethylene particles having an average primary particle diameter of from 0.10 to 0.30 µm, by subjecting tetrafluoroethylene and a perfluoroalkyl ethylene to emulsion polymerization in an aqueous medium, using a polymerization initiator, in the presence of a fluorinated anionic surfactant having a LogPOW of from 2.4 to 3.4, wherein the amount of the perfluoroalkyl ethylene to be used, is from 120 to 3,000 ppm to the final production amount of the modified polytetrafluoroethylene; at the initiation of the emulsion polymerization, the entire amount of the perfluoroalkyl ethylene is permitted to be present, and, as the polymerization initiator, either one or both of a combination of a bromate and a bisulfite or sulfite, and a combination of a permanganate and oxalic acid, are used.
提供一种改性聚四氟乙烯水乳液的生产方法,该方法对环境友好,且适用于生产具有优异断裂强度的拉伸多孔体。一种改性聚四氟乙烯水乳液的生产方法,该方法是在水介质中,使用聚合引发剂,在 LogPOW 为 2.4 至 3.4 的氟化阴离子表面活性剂存在下,使四氟乙烯和全氟烷基乙烯进行乳液聚合,从而获得平均主颗粒直径为 0.10 至 0.30 微米的改性聚四氟乙烯颗粒的水乳液。4至3.4,其中全氟烷基乙烯的用量为改性聚四氟乙烯最终生产量的120至3,000ppm;在乳液聚合开始时,允许全氟烷基乙烯的全部用量存在,作为聚合引发剂,使用溴酸盐和亚硫酸氢盐或亚硫酸盐的组合以及高锰酸盐和草酸的组合中的一种或两种。