FIELD: polymer materials.
SUBSTANCE: invention relates to a method for removing volatile fluorinated emulsifiers in free acid form from aqueous fluoropolymer dispersion, which method comprises introduction of nonionic emulsifier into said aqueous fluoropolymer dispersion and distillation-mediated removal of volatile fluorinated emulsifier at pH value of aqueous fluoropolymer dispersion below 5 until concentration of volatile emulsifier in dispersion achieves desired value. Invention also discloses a method of preparing aqueous fluoropolymer dispersion, a method of treating substrate and aqueous fluoropolymer dispersion.
EFFECT: increased content of solids in dispersion essentially free of fluorinated emulsifier.
| Title | Year | Author | Number |
|---|---|---|---|
| AQUEOUS DISPERSIONS OF FLUOROPOLYMERS | 1999 |
|
RU2236419C2 |
| PROCESS DECREASING AMOUNT OF FLUORO-CONTAINING SURFACTANT IN AQUEOUS FLUOROPOLYMERIC DISPERSIONS | 2003 |
|
RU2319712C2 |
| METHOD OF PRODUCING FLUOROPOLYMERS AND FLUOROELASTOMERS IN PRESENCE OF NON-FLUORINATED HYDROCARBON-CONTAINING SURFACTANT OF SULPHONATE TYPE | 2020 |
|
RU2815785C1 |
| FLUOROPOLYMER DISPERSION CONTAINING NO OR SMALL AMOUNT OF LOW-MOLECULAR WEIGHT FLUORINATED SURFACTANT | 2002 |
|
RU2294940C2 |
| FLUOROPOLYMER COMPOUNDS CONTAINING MULTI-ATOMIC COMPOUNDS AND METHODS OF PRODUCTION THEREOF | 2010 |
|
RU2522749C2 |
| METHOD OF PRODUCING FLUOROPOLYMER USING FLUOROCARBOXYLIC ACID DERIVATIVE | 2008 |
|
RU2448982C2 |
| FLUORINE-CONTAINING EMULSIFIER REGENERATION METHOD | 2000 |
|
RU2255807C2 |
| METHOD FOR SUBSTRATE COATING BY FLUOROPOLYMER DISPERSION | 2005 |
|
RU2363549C2 |
| WATER-EMULSION POLYMERISATION OF FLUORINATED MONOMERS USING PERFLUOROPOLYETHER SURFACTANT | 2006 |
|
RU2428434C2 |
| METHOD OF PRODUCING AQUEOUS DISPERSION OF FLUORINE-CONTAINING POLYMER, HAVING LOW CONTENT OF FLUORINE-CONTAINING EMULSIFYING AGENT | 2007 |
|
RU2439083C2 |
