| 摘要 |
Use for the preparation of paints for substrata coatings of aqueous dispersions of VDF-based polymers having an average particle size between 0.260 and 0.3 micrometers comprising a bifunctional surfactant of formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ A-R f -B€ƒ€ƒ€ƒ€ƒ€ƒ(I)
wherein
A = -O-CFX-COOM; B = -CFX-COOM with X = F, CF 3 ;
M = NH 4 , alkaline metal, H;
R f is a linear or branched perfluoroalkyl chain, or a (per)fluoropolyether chain such that the number average molecular weight of (I) is in the range 600-800. |
