Aqueous fluororesin dispersion and method for producing the same
a technology of aqueous fluororesin and dispersions, which is applied in the direction of non-metal conductors, conductors, organic conductors, etc., can solve the problems of lack of substantial disclosure about the concentration, phase separation, and the concentration of aqueous fluororesin dispersions, and achieve excellent dispersion stability, low fluorinated surfactant content, and high melt-processable fluororesin concentration
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example 1
(1) Treatment in Contact with Ion Exchange Resin
[0083]A 10% aqueous solution (150 L) of polyoxyethylene alkyl ether (LEOCOL TD90, trade name, product of LION Corp.) as a nonfluorinated nonionic surfactant was passed through a column (30 cm in diameter, 200 cm in height) packed with 150 L of Amberjet IRA 40020H (trade name, product of ROHM AND HAAS Company) as an OH-form anion exchange resin over 1 hour.
[0084]An aqueous FEP dispersion (600 L; FEP particles having an average primary particle diameter of 100 nm) adjusted to a fluororesin concentration of 35%, a LEOCOL TD90 concentration of 10% relative to the fluororesin and a PFOA concentration of 1020 ppm of the fluororesin was passed through the above column over 4 hours (space velocity (SV)=0.5), whereby a FEP dispersion (fluororesin concentration: 35% by mass, nonfluorinated nonionic surfactant concentration: 10% / fluororesin) was obtained. The PFOA concentration in the FEP dispersion obtained was below the detection limit (10 ppm)...
example 2
[0086]To the FEP dispersion obtained in Example 1 by the treatment in contact with the ion exchange resin was added LEOCOL TD90 in a further amount corresponding to 10% of the fluororesin, sodium dioctyl sulfosuccinate (0.1% (by mass) aqueous solution thereof having a surface tension of 26 mN / m at 25° C.), in the form of a 70% methanol solution, was added in an amount corresponding to 1856 ppm of the fluororesin, the fluororesin concentration was adjusted to 30% by addition of water and, further, the pH was adjusted to 9.5 with aqueous ammonia. The dispersion obtained had an electric conductivity at 25° C. of 380 μS / cm. This dispersion was allowed to stand at 70° C. for 5 hours; it separated into two phases. The supernatant phase was removed and the concentrated phase was recovered; thus was obtained an aqueous fluororesin dispersion having a fluororesin concentration of 61%, having a nonfluorinated nonionic surfactant concentration at a level corresponding to 5.3% of the fluororesi...
example 3
[0087]To the FEP dispersion obtained in Example 1 by the treatment in contact with the ion exchange resin was added LEOCOL TD90 in a further amount corresponding to 10% of the fluororesin, sodium lauryl sulfate was added in an amount corresponding to 1204 ppm of the fluororesin, the fluororesin concentration was adjusted to 30% by addition of water and, further, the pH was adjusted to 9.5 with aqueous ammonia. The dispersion obtained had an electric conductivity at 25° C. of 450 μS / cm. This dispersion was allowed to stand at 70° C. for 5 hours; it separated into two phases. The supernatant phase was removed and the concentrated phase was recovered; thus was obtained an aqueous fluororesin dispersion having a fluororesin concentration of 61%, having a nonfluorinated nonionic surfactant concentration at a level corresponding to 5.2% of the fluororesin, containing fluororesin particles with an average primary particle diameter of 100 nm and having an electric conductivity at 25° C. of ...
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