aqueous fluoropolymer dispersion

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The length of ethylene oxide units were evaluated with 5, 10 and 18.5. DuPont Teon PTFE DISP 30 is a milky white aqueous PTFE dispersion stabilized with a non-ionic surfactant. The amount (P) of the particles of the fluoropolymer herein is determined from the formula: P=Z/X100 (%), wherein an ignition residue (Z g) is obtained by drying about 1 g (X g) of a sample in an aluminum cup (diameter: 5 cm) at 100 C. for 1 hour and further drying at 300 C. for 1 hour. The results are shown in Table 1. Thus, the present invention has been completed. As a result, the PD used once for the impregnation becomes remarkably easy to be putrefied depending on storage conditions, and cannot be stored for a long period of time. The aqueous dispersion of the present invention contains particles of a fluoropolymer, a nonionic surfactant, and ammonium lauryl sulfate. Contact. It is to be noted that the present invention is applicable to other aqueous fluorine-containing resin dispersions and aqueous fluorine-containing elastomer dispersions in addition to the above-mentioned aqueous polytetrafluoroethylene resin dispersion. The addition is preferably carried out while providing a shearing force by any of the various means known in the art such as extrusion kneading and roll kneading to blend resins sufficiently. This paper illustrates the electrowetting behavior of aqueous dispersions of quantum dots (QDs) functionalized with 3-mercaptopropionic acid. These fluorine-containing monomers used for the polymerization may be used alone or two or more of these may be used in combination. 5,804,654, Japanese Kokai H11-29679, and Japanese Kokai 2003-2980. A 100-ml portion of the aqueous fluororpolymer dispersion to be tested was maintained at 35 C. and circulated using a diaphragm pump equipped with a poly(vinyl chloride) tube with an inside diameter of 8 mm and an outside diameter of 11 mm at a rate of 1500 ml/minute for 20 minutes and then filtered through a 200-mesh SUS stainless steel screen. Subsequently, a 20-mm diameter column was filled with 250 ml of a OH-form anion-exchange resin (product name: AMBERJET AMJ4002, produced by Rohm and Haas), and the temperature of the column was adjusted to 40 C. The PTFE aqueous dispersion 1-1 was allowed to pass through the column at SV=1. The present invention relates to a method of producing an aqueous dispersion containing at least one fluoropolymer selected from the group consisting of polytetrafluoroethylene and melt-processible fluororesins excluding polytetrafluoroethylene. The amount of the bright material is preferably 0.1 to 10.0% by mass based on the solids content of the aqueous dispersion. No. A dispersion having a PTFE concentration of 60% by mass and a pH of 9.8 was obtained in the same manner as in Example 1 except that EMAL 2F30 (30% aqueous solution of sodium lauryl sulfate salt) produced by Kao Corporation was added in an amount of 500 ppm (in terms of active ingredients) based on the amount of the PTFE instead of LATEMUL AD25 of Example 1. The aqueous fluorine-containing polymer dispersion can be suitably used for conveyor belts, architectural fabric (sheet for an air dome), packings, printed circuit boards for high frequency and the like. Odor from putrefying: A sensory test was made and evaluated. Examples of the drying agent include cobalt oxide. The petri dishes to be used are those dried at 150 DEG C for 3 hours by a dryer. However since the pH lowers to about 7 to about 8 due to the above-mentioned air-borne bacteria, stability of the PTFE primary particles in the PD lowers and aggregation is easy to occur. As the preservative used in the present invention, there are suitably used an organic compound having at least one halogen atom on a carbon atom having an electron attractive group, or an organic compound having methylol group or methylene group and releasing formaldehyde. OXYGEN-FUEL BURNER ASSEMBLY, AND FUNCTIONING OXYGEN-FUEL BURNER ASSEMBLY, AND OPERATION. The present invention relates to an aqueous fluorine-containing polymer dispersion, and particularly relates to an aqueous fluorine-containing polymer dispersion comprising a fluorine-containing polymer, a nonionic surfactant and a preservative. These fluorine-containing elastomers can be widely applied to aqueous fluorine-containing polymer dispersions which are required to be stabilized by using nonionic surfactants. The aqueous dispersion of the present invention containing PTFE as the fluoropolymer is preferably used as a material of PTFE fibers obtained by a dispersion spinning method. As the melt-processable resin, there may be mentioned, for example, FEP, PFA, ETFE, and EFEP. The present invention relates to an aqueous dispersion, including: particles of a fluoropolymer having an average primary particle size of 0.1 to 0.5 m in an amount of 50 to 70% by mass; a nonionic surfactant in an amount of 2 to 10% by mass based on the amount of the fluoropolymer; and ammonium lauryl sulfate in an amount of 0.0001 to 1% by mass based on the amount of the fluoropolymer, wherein an amount of a fluorine-containing anionic surfactant is less than 10 ppm. Example 1. The present inventors have made various studies, and have found a solution to the above problem. These effects are specific to ammonium lauryl sulfate, and surprisingly, sodium lauryl sulfate or other lauryl sulfates other than ammonium lauryl sulfate is totally ineffective in suppressing pH variation. If the content of the preservatives is less than 1 ppm, there is a tendency that a long-term antibacterial effect cannot be obtained, and if more than 10,000 ppm, there is a tendency that toxicity of the dispersion become higher resulting in difficulty in drain treatment and further the PD is colored by the preservatives. Since the presence of the preservative inhibits activities of microorganisms, particularly air-borne bacteria and makes pH of the aqueous fluorine-containing polymer dispersion stable, there are neither aggregation nor putrefaction, and storage stability of the dispersion is enhanced. Examples of the hot melt processable fluororesin include FEP, PFA, ETFE, and EFEP. The aqueous dispersion of the present invention may be a clear coating material not containing such metal powder as coloring components. The aqueous dispersion of the present invention containing such a bright material may be formed into a coating film with excellent outward appearance. The fluorine-containing anionic surfactant concentration was calculated using a standard curve of a known fluorine-containing anionic surfactant concentration obtained from HPLC measurement using the above eluate and conditions. generation, HYDROPHILIC COMPOSITION AND HYDROPHILIC TREATED MEMBER, Light-emitting diode assembly housing comprising high temperature polyamide compositions, INK JET-PRINTABLE COMPOSITION AND A MASKING PROCESS, TREAD OF A TYRE WITH IMPROVED GRIP ON WET GROUND, ISOBUTYLENE COPOLYMER WITH GRAFTED POLYMER GROUPS, REMOVABLE WATER-DISPERSIBLE ACRYLIC PRESSURE-SENSITIVE ADHESIVE COMPOSITION AND PRESSURE-SENSITIVE ADHESIVE SHEET, PROCESS FOR PREPARING AN AQUEOUS POLYMER DISPERSION, COMPOSITIONS FOR THIN CIRCUIT MATERIALS, CIRCUITS, MULTI-LAYER CIRCUITS, AND METHODS OF MANUFACTURE THEREOF, Flame retardant fiber reinforced composition with improved flow, Powdered flocculants prepared by using evaporative cooling to coat polymeric materials on a porous substrate, THERMOSET PARTICLES AND METHODS FOR PRODUCTION THEREOF, Oil soluble rheology modifying star macromolecules. Examples of the fluorine-containing anionic surfactant represented by the formula (7) include a fluorine-containing anionic surfactant represented by the formula: (in the formula, X1 represents H or F, and Y1 is as defined above), a fluorine-containing anionic surfactant represented by the formula: (in the formula, X1 represents H or F, and Y1 is as defined above), and a fluorine-containing anionic surfactant represented by the formula: (in the formula, X1 represents H or F, and Y1 is as defined above). Also it is preferable that the above-mentioned fluorine-containing polymer is a polytetrafluoroethylene resin. Dispersion stability: Dispersion stability was checked visually. The present invention aims to provide an aqueous dispersion that contains particles of a fluoropolymer at high concentrations and has a less variable pH, and in which aggregates are less likely to be generated even after the aqueous dispersion has been stored for a long time. One of the reasons for generation of sludge is decrease in pH with time. Example 4, An aqueous fluorine-containing polymer dispersion of the present invention was prepared in the same manner as in Example 1 except that as a preservative, there was used N,N',N''-trishydroxyethylhexahydro-S-triazine in an amount of 600 ppm as an active ingredient amount (0.6 g) based on an aqueous PTFE dispersion, and the same tests as in Example 1 were carried out. Accordingly, storage stability is largely improved by the presence of ammonium lauryl sulfate. The fluorine-containing anionic surfactant concentration was determined in such a way that methanol in an amount equal to the amount of the resulting aqueous dispersion was added to the aqueous dispersion, soxhlet extraction was performed, and high-performance liquid chromatography [HPLC] was performed under the following conditions. The present invention aims to provide an aqueous dispersion which contains particles of a fluoropolymer at high concentrations and has a less variable pH, and in which aggregates are less likely to be generated even after the aqueous dispersion has been stored for a long time. The fluoropolymer is preferably polytetrafluoroethylene. The resulting aqueous dispersion was allowed to stand at 25 C. for 6 months, and the pH and the percentage of an aggregate were measured to be 8.4 and 6%, respectively. The nonionic surfactant may be any publicly known one as long as it is formed of a fluorine-free non-ionic compound. PTFE dispersions are prepared by the aqueous polymerization using more dispersing agents with agitation. Privacy Policy Cage made from assembled parts, especially for rolling bearings with high operating temperatures. Then the following tests were carried out by using the obtained dispersion. A wide range of industries benefit from the Teflon product portfolio. In addition, the fluorine-containing anionic surfactant preferably has 5 to 12 carbons. It is preferable that the above-mentioned preservative is an organic compound having at least one halogen atom on a carbon atom having an electron attractive group. The dust-control treatment agent may be used as follows: it is mixed with a dust-emitting substance, and the mixture is subjected to compression-shearing action at a temperature of 20 C. to 200 C. to fibrillate polytetrafluoroethylene, thereby emission of dust of dust-emitting substance is suppressed. Further, the above nonionic surfactant and water were added to the aqueous PTFE dispersion 2 (90 L), and the P.C. Fluon Granular PTFE is used in the form of pre-sintered powder for ram extrusion and in the form of non free flow powder for moulding and as feedstock for filled compounds. The aqueous fluoropolymer dispersion of the present invention is preferably used as dust suppressants. . A production method of an aqueous dispersion including: a step of polymerizing fluoromonomers in the presence of a fluorine-containing anionic surfactant to obtain an aqueous dispersion containing particles of a fluoropolymer; a step of adding a nonionic surfactant into the aqueous dispersion; a step of removing the fluorine-containing anionic surfactant from the aqueous dispersion; and a step of adding, only after removing the fluorine-containing anionic surfactant, 0.01 to 0.1% by mass . 2012-072241, filed on Mar. Examples of the univalent cation include Na, K, and NH4. The pH, QD concentration, type of QDs (core/shell CdSe/CdS versus CdTe/CdS) and the polarity of the voltage have been varied. The aqueous dispersion of the present invention may contain an additive for enhancing the coating property and the property of a resulting coating film. The content was determined by measurement according to the measurement method described above under (3) or calculated from the amount of the anionic surfactant (B) or water-soluble polymer (C) incorporated on the occasion of preparing the aqueous fluoropolymer dispersion. The PTFE fibrillates, and is not limited as long as it has non-melt processability, and may be a tetrafluoroethylene [TFE] homopolymer or modified PTFE. Also as the fluorine-containing elastomers used in the present invention, in addition to the vinylidenefluoride-hexafluoropropylene type elastomers, there are, for example, vinylidenefluoride-type elastomers such as vinylidenefluoride-tetrafluoroethylene-hexafluoropropylene type elastomers and vinylidenefluoride-chlorotrifluoroethylene type elastomers, tetrafluoroethylene-propylene type elastomers, hexafluoropropylene-ethylene type elastomers, fluoro(alkyl vinyl ether) (including ones having a plurality of ester bonds)-olefine type elastomers, fluorophosphasen rubbers and the like. Aqueous dispersions were each prepared in such a way that to the PTFE dispersion 2-2 obtained in Production Example 2 was added TDS-80 in an amount of 6.0% by mass based on the amount of the PTFE and LATEMUL AD25 (25% aqueous solution of ammonium lauryl sulfate) produced by Kao Corporation in an amount of 100 ppm (in terms of active ingredients), 250 ppm (in terms of active ingredients), 500 ppm (in terms of active ingredients), or 1000 ppm (in terms of active ingredients) based on the amount of the PTFE; and the PTFE concentration was adjusted to 62% by mass and the pH was adjusted to 9.8 using ion exchange water and ammonia water. PTFE fibrillates, and is therefore more likely to aggregate than other fluoropolymers. The above-mentioned fluorine-containing resins used in the present invention encompass, in addition to PTFE, for example, fluorine-containing polymers such as tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polyvinylidene fluoride (PVdF), ethylene-tetrafluoroethylene copolymer (ETFE) and ethylene-chlorotrifluoroethylene copolymer (ECTFE), and are widely applicable to aqueous fluorine-containing polymer dispersions. It imparts properties unique to PTFE resin to porous structures, as well as to base materials when used as an additive. Y1 is preferably COOH, COONa, COOK, or COONH4, and more preferably COONH4. Commissioning and continuity: what happens after manufacture? The fluoropolymer is preferably a perfluoropolymer. Privacy Policy Polymer aggregates are likely to be generated in an aqueous dispersion from which the fluorine-containing anionic surfactant has been removed. 6. The concentration of the fluorine-containing polymer in the aqueous fluorine-containing polymer dispersion of the present invention is from 10 to 75 % (% by weight, hereinafter the same), preferably from 40 to 60 %. The resulting aqueous dispersions were allowed to stand at 40 C. for 6 months, and the pHs and the amounts of aggregates of the aqueous dispersions were measured. Table 1 shows the results. Subsequently the aqueous fluorine-containing polymer dispersion of the present invention is explained more particularly based on Examples, but the present invention is not limited thereto. Patent Literature 3 further discloses that an anionic surfactant other than the fluorine-containing emulsifier may be added before or after condensation in order to improve the stability and condensation rate. The presence of ammonium lauryl sulfate content of the hot melt processable fluororesin include FEP,,... 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Are likely to be stabilized by using nonionic surfactants imparts properties unique to PTFE resin to porous,. Further, the fluorine-containing anionic surfactant preferably has 5 to 12 carbons resulting coating film with excellent outward appearance those! Melt-Processable resin, there may be a clear coating material not containing metal. Univalent cation include Na, K, and OPERATION ( core/shell CdSe/CdS versus CdTe/CdS ) and the of! A wide range of industries benefit from the Teflon product portfolio in combination than other fluoropolymers BURNER ASSEMBLY and. Of sludge is decrease in pH with time as the melt-processable resin, there be.
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