To provide a polytetrafluoroethylene (PTFE) aqueous dispersion, which does not substantially contain ammonium perfluorooctanoate and is excellent in mechanical stability, wettability, permeability and coating property, and its product.
A PTFE aqueous dispersion comprising from 15 to 70 mass % of PTFE fine particles having an average particle size of from 0.1 to 0.5 μm, from 1×10
−5
to 0.5 mass %, based on the mass of the PTFE, of a fluorinated emulsifier of the formula (1): XCF
2
CF
2
(O)
m
CF
2
CF
2
OCF
2
COOA, wherein X is a hydrogen atom or a fluorine atom, A is a hydrogen atom, an alkali metal or NH
4
and m is an integer of 0 or 1, and from 1 to 20 mass %, based on the mass of the PTFE, of a nonionic surfactant.
提供一种聚
四氟乙烯(P
TFE)
水分散体,不含有明显的
全氟辛酸铵,具有优异的机械稳定性、润湿性、渗透性和涂层性能,以及其产品。该P
TFE水分散体包括以下成分:P
TFE细微粒子15-70质量%,平均粒径为0.1-0.5微米;
氟化
乳化剂1×10−5-0.5质量%,基于P
TFE质量,
化学式为(1):X
CF2CF2(O)m
CF2CF2O
CF2COOA,其中,X为氢原子或
氟原子,A为氢原子、碱
金属或NH4,m为0或1;非离子表面活性剂1-20质量%,基于P
TFE质量。