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Aqueous fluorine-containing polymer dispersion and method for production thereof

A kind of technology of aqueous dispersion and manufacturing method, applied in the field of fluoropolymer aqueous dispersion

Active Publication Date: 2008-05-21
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description on the problem that the fluoropolymer aqueous dispersion produces an amine odor due to contact with a basic anion exchange resin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] At a temperature of 50°C and a space velocity (SV) of 2, 400ml of the fluoropolymer dispersion was passed through a column (diameter 20mm) filled with 25ml of anion exchange resin (trade name Amberlite IRA900J manufactured by Rohm and Haas). ), thus carrying out contact (P) to obtain a liquid containing PFOA in an amount equivalent to 50 ppm of the above-mentioned fluoropolymer and containing 2 ppm of trimethylamine in the total amount of the liquid, and the fluoropolymer dispersion contains 32% of Polytetrafluoroethylene (PTFE), as a fluoropolymer, contains 6 parts of nonionic surfactant (TDS80C, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) with respect to 100 parts of the fluoropolymer, and contains the equivalent of the fluoropolymer PFOA in the amount of 3000ppm of the substance.

[0105] Under the condition that the temperature is 50° C. and the space velocity (SV) is 2, the resulting liquid is passed through a column (20 mm in diameter) filled with 25 m...

Embodiment 2

[0107] At a temperature of 50°C and a space velocity (SV) of 2, 400 ml of the fluoropolymer dispersion was passed through a column (diameter 20 mm) filled with 25 ml of anion exchange resin (trade name Amberlite IRA402J, manufactured by Rohm and Haas). ), thus carrying out contact (P) to obtain a liquid containing PFOA in an amount equivalent to 45 ppm of the above-mentioned fluoropolymer and containing 3 ppm of trimethylamine in the total amount of the liquid, and the fluoropolymer dispersion contains 32% of PTFE is used as a fluoropolymer, and contains 6 parts of nonionic surfactant (TDS80C, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) with respect to 100 parts of this fluoropolymer, and contains 3000 ppm of the amount corresponding to this fluoropolymer PFOA.

[0108] Under the condition that the temperature is 50° C. and the space velocity (SV) is 2, the resulting liquid is passed through a column (20 mm in diameter) filled with 25 ml of cation exchange resin (t...

Embodiment 3

[0110] Under the condition that the temperature is 50° C. and the space velocity (SV) is 2, 400 ml of the fluoropolymer dispersion is passed through a column (diameter 20 mm) filled with 25 ml of anion exchange resin (trade name Amberlite IRA402J, manufactured by Rohm and Haas). ), thus carrying out contact (P) to obtain a liquid containing PFOA in an amount equivalent to 50 ppm of the above-mentioned fluoropolymer and containing 3 ppm of trimethylamine in the total amount of the liquid, and the fluoropolymer dispersion contains 32% of PTFE is used as a fluoropolymer, and contains 6 parts of nonionic surfactant (TDS80C, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) with respect to 100 parts of this fluoropolymer, and contains 3000 ppm of the amount corresponding to this fluoropolymer PFOA.

[0111] On the other hand, activated carbon (Zeocol M-10A, manufactured by Asahi Filtration Co., Ltd.) was heated at 150° C. for 3 hours, soaked in ion-exchanged water and left to...

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Abstract

The present invention relates to an aqueous fluoropolymer dispersion and a method for producing the same. The aqueous fluoropolymer dispersion will not generate amine odor no matter whether it has been in contact with an anion exchange resin or not. The aqueous fluoropolymer dispersion provided by the present invention contains a nitrogen-containing organic base and / or a salt thereof, and particles formed of a fluoropolymer are dispersed, and the aqueous fluoropolymer dispersion is characterized in that the above-mentioned The total amount of the nitrogen-containing organic base and / or its salt is 0 to 1 ppm of the above-mentioned aqueous fluoropolymer dispersion.

Description

technical field [0001] The present invention relates to aqueous fluoropolymer dispersions and methods for their manufacture. Background technique [0002] Aqueous fluoropolymer dispersions can form films, coatings, etc. that exhibit excellent properties in terms of chemical stability, non-adhesiveness, and weather resistance by coating, immersion, etc., so they are widely used in cooking equipment, piping, etc. Bushing, glass cloth impregnated film, etc. Aqueous fluoropolymer dispersions are generally obtained by polymerization in the presence of fluorosurfactants. However, fluorosurfactants are the cause of impairing the excellent properties of fluoropolymers, and therefore it is desired to remove fluorosurfactants from aqueous fluoropolymer dispersions. In addition, the above-mentioned fluorosurfactants are generally expensive and are therefore preferably recovered for reuse. [0003] As a method for recovering fluorosurfactants, a method of bringing an aqueous fluoropo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/05C08K5/17C08L27/12
CPCC08K5/17C08K5/095C08L27/18C08J2327/12C08J3/05C08L71/02C08L27/12C08L2666/04
Inventor 泽内千绘津田畅彦
Owner DAIKIN IND LTD