METHOD OF PREPARING AQUEOUS DISPERSION OF FLUOROPOLYMERS

摘要

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.