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Water-soluble fluid dispersion of fluorine-containing polymer

An aqueous dispersion and polymer technology, which is applied in the field of fluoropolymer aqueous dispersions, and can solve the problems of unresearched pH adjustment.

Active Publication Date: 2009-09-23
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the adjustment of the pH after concentration has not been studied at all
[0013] Ammonia or amine-like odors from the above aqueous fluoropolymer dispersions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0106] To the aqueous dispersion of PTFE (average primary particle diameter 230nm, SSG 2.182, PFOA 3500ppm / polymer) obtained by emulsion polymerization, 5% by mass of nonionic surfactant TDS80 (trade name, No. Kogyo Pharmaceutical Co., Ltd.), and then eluted at SV=1 on a column packed with 2 L of anion exchange resin IRA4002OH (trade name, manufactured by Rohm and Haas Co., Ltd.) and eluted with 10 L of pure water. The pH of the eluted aqueous dispersion was 10.3, and PFOA was below the detection limit (less than 10 ppm / Polymer). TDS80 and water were added to the obtained aqueous dispersion to adjust the concentration of the fluoropolymer to 25% by mass and the concentration of the nonionic surfactant to be 15% by mass / polymer. The adjusted dispersion liquid was kept at 65° C., and the supernatant phase and the concentrated phase were separated after 8 hours. The concentration of the fluorine-containing polymer in the concentrated phase was 70% by mass, the concentration of t...

Embodiment 1

[0108] To the aqueous dispersion obtained in Preparation Example 1, 225 ppm of phosphoric acid aqueous solution was added to the aqueous dispersion to adjust the pH to 7.35. The viscosity was 23 cps at 25°C, and the mechanical stability index was 3.2%. Regarding the metal salt concentration, Ca is less than 0.01 ppm, Na is 0.44 ppm, and K is 1 ppm relative to the aqueous dispersion. No smell was felt.

Embodiment 2

[0110] Except having added 725 ppm of ammonium dihydrogen phosphate with respect to an aqueous dispersion liquid, it carried out similarly to Example 1, and obtained the aqueous dispersion liquid whose pH was 7.3. The viscosity was 19 cps at 25°C and the mechanical stability index was 5%. No smell was felt.

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Abstract

The present invention relates to a water-soluble fluid dispersion of fluorine-containing polymer, which will not generate a odor of ammine or amines, has an excellent dispersion stability, and may be used for various usages. The water-soluble fluid dispersion of the invention is characterized in that its pH value is from 6.0 to 8.0 at a temperature of 25 DEG C, and a solid component concentration of the fluorine-containing polymer is from 40 to 75 mass percents.

Description

technical field [0001] This invention relates to aqueous fluoropolymer dispersions. Background technique [0002] As a method for preparing an aqueous fluorinated polymer dispersion, a method utilizing emulsion polymerization is generally mentioned. In emulsion polymerization, surfactants, mainly fluorinated anionic surfactants (hereinafter referred to as "fluorinated anionic emulsifiers") are used. [0003] As fluorine-containing anionic emulsifiers, perfluorocarboxylic acids or salts thereof such as perfluorooctanoic acid or its salts (hereinafter both collectively referred to as "PFOA"), perfluorooctane sulfonic acid or its salts (hereinafter both collectively referred to as "PFOA"), etc. "PFOS") etc. [0004] In the aqueous fluorine-containing polymer dispersion that is generally distributed as a product, a nonionic surfactant is added to the aqueous dispersion obtained by emulsion polymerization for stabilization. The concentration of the fluoropolymer contained in t...

Claims

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Application Information

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IPC IPC(8): C08L27/12C08J3/05
Inventor 泽内千绘泽田又彦
Owner DAIKIN IND LTD