METHOD FOR PRODUCING POLYTETRAFLUOROETHYLENE MOLDING POWDER AND METHOD FOR PRODUCING POLYTETRAFLUOROETHYLENE GRANULATION PRODUCT
申请人:Asahi Glass Company, Limited
公开号:EP2955197A1
公开(公告)日:2015-12-16
To provide a process for producing a PTFE molding powder having a high bulk density from granular polymer particles without using an emulsifying agent having problems of bioaccumulation and toxicity.
A process for producing a polytetrafluoroethylene molding powder, which comprises a step of suspension-polymerizing a monomer containing at least 99.8 mass% of tetrafluoroethylene in an aqueous medium to produce granular polymer particles and a step of milling the granular polymer particles, wherein the aqueous medium contains a compound represented by RF(OCF(X1)CF2)k-1OCF(X2)COO-M+, at a concentration of from 0.5 to 2,000 ppm. RF is a perfluorinated C1-10 monovalent organic group, X1 and X2 are fluorine atoms, etc., and M+ is an ammonium ion or the like.
提供一种无需使用具有生物蓄积性和毒性问题的乳化剂,即可从粒状聚合物颗粒中生产出具有高堆积密度的聚四氟乙烯模塑粉的工艺。
一种生产聚四氟乙烯模塑粉的工艺,包括在水介质中悬浮聚合含有至少 99.8 质量%的四氟乙烯的单体以生产粒状聚合物颗粒的步骤,以及碾磨粒状聚合物颗粒的步骤,其中水介质含有 RF(OCF(X1)CF2)k-1OCF(X2)COO-M+ 代表的化合物,浓度为 0.5 至 2,000 ppm。RF 是全氟 C1-10 单价有机基团,X1 和 X2 是氟原子等,M+ 是铵离子等。