WO2023106288A1 - Procédé de traitement d'élimination de poussière - Google Patents

Procédé de traitement d'élimination de poussière Download PDF

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WO2023106288A1
WO2023106288A1 PCT/JP2022/044903 JP2022044903W WO2023106288A1 WO 2023106288 A1 WO2023106288 A1 WO 2023106288A1 JP 2022044903 W JP2022044903 W JP 2022044903W WO 2023106288 A1 WO2023106288 A1 WO 2023106288A1
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dust
mass
melt
aqueous dispersion
flowable
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PCT/JP2022/044903
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English (en)
Japanese (ja)
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拓治 西村
宏介 森
厳 江頭
一雄 小鍋
正輝 麦沢
喜文 乙女
Original Assignee
株式会社Nippo
村樫石灰工業株式会社
三井・ケマーズ フロロプロダクツ株式会社
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Priority to JP2023529124A priority Critical patent/JPWO2023106288A1/ja
Publication of WO2023106288A1 publication Critical patent/WO2023106288A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/22—Materials not provided for elsewhere for dust-laying or dust-absorbing

Definitions

  • the present invention relates to a dust suppression treatment method using a dust suppression treatment agent composition that has excellent performance in suppressing dust from dust-generating substances and is also excellent in redispersibility.
  • Dust composed of a fluoroethylene (hereinafter referred to as TFE) copolymer aqueous dispersion, the redispersion sedimentation rate of the TFE copolymer being 60% or less, and the content of perfluorooctanoic acid and its salts being less than 10 ppb.
  • TFE fluoroethylene
  • the present invention relates to a method for dust suppression treatment of dust-generating substances using a dust suppression treatment agent composition.
  • Patent Document 1 PTFE (TFE polymer) is mixed with a powdery substance, and the mixture is subjected to a compression-shearing action at a temperature of about 20 to 200 ° C. to make TFE heavy. Methods have been proposed for suppressing dusting of powdery substances by fibrillating coalescence.
  • TFE polymer described in Patent Document 1 below is a homopolymer of TFE as a composition, Teflon (registered trademark) 6 or Teflon (registered trademark) 30 as a fine powder or emulsion as a composition, and TFE as a composition. It is a modified polymer of Teflon (registered trademark) 6C, which is a fine powder.
  • Patent Document 2 a dust suppression method using a stable aqueous emulsion containing 1.0% by mass or more of a hydrocarbon-based anionic surfactant with respect to a homopolymer of TFE (TFE polymer) is used. has been proposed and shown to have a dust-suppressing effect on powdery substances.
  • particles of the TFE polymer are prepared by the emulsion polymerization method disclosed in Patent Documents 3 and 4 below, that is, an anionic interface using TFE as a water-soluble polymerization initiator and a fluoroalkyl group as a hydrophobic group.
  • aqueous emulsion It is produced in the form of an aqueous emulsion by injecting an active agent (hereinafter referred to as a fluorine-containing emulsifier) into an aqueous medium containing an emulsifier and polymerizing it, and an emulsion stabilizer is added to increase the stability.
  • an active agent hereinafter referred to as a fluorine-containing emulsifier
  • Patent Document 5 discloses that the use of a dust-suppressing treatment agent composition comprising an aqueous dispersion of a fluoropolymer having a fluorine-containing emulsifier content of 50 ppm or less has a dust-suppressing effect and is environmentally friendly. A method is described that can suppress dust without worrying about its effects.
  • the TFE polymer aqueous dispersion used as the dust-suppressing treatment agent composition in these methods tends to settle when left standing for a long period of time, and once the TFE polymer settles, it solidifies and is difficult to redisperse.
  • the TFE polymer concentration in the TFE polymer aqueous dispersion may be lowered, and the dust-suppressing effect originally provided by the TFE polymer may not be fully exhibited. rice field.
  • the present invention has an excellent dust suppressing effect and is also excellent in redispersibility of the non-melt-flowable TFE copolymer, which is a solid content in the dust suppressing treatment agent composition after standing for a long period of time. Further, it is an object of the present invention to provide a dust suppression treatment method using a dust suppression treatment agent composition which is excellent in environmental performance.
  • the present invention comprises a non-melt-flowable TFE copolymer aqueous dispersion, the copolymer represented by the following formula (1) has a redispersion sedimentation rate of 60% or less, and the perfluoropolymer in the aqueous dispersion
  • a dust suppressing treatment agent composition containing less than 10 ppb of octanoic acid and its salts
  • the dust suppressing treatment agent composition is mixed with a dust-generating substance, and the mixture is heated at a temperature of 20 to 200°C.
  • a method for suppressing dust from a dust-generating substance comprising fibrillating a TFE copolymer by subjecting it to compression-shearing action to suppress generation of dust from the dust-generating substance.
  • Redispersion sedimentation rate (%) X 3 /X 2 ⁇ 100 (1)
  • X 2 15 g of a TFE polymer aqueous dispersion having the same concentration as the copolymer was heated to 2
  • X 3 15 g of the aqueous copolymer dispersion was heated to 20°C and rotated at 3000 After centrifuging with a centrifuge for 30 minutes at rpm, when re-dispersed, the solid content sedimentation ratio after re-dispersion indicated by the following formula (2) (%)
  • Solid sedimentation ratio after redispersion (%) (Amount of sedimentation of solid content after redispersion) / (Amount of solid content before centrifugation) x 100 ...
  • the content of the perfluorooctanoic acid and its salt in the aqueous dispersion is less than 5 ppb.
  • the non-melt-flowable TFE copolymer is a non-melt-flowable copolymer of TFE and at least one comonomer selected from (perfluoroalkyl)ethylene, perfluoro(alkyl vinyl ether), and hexafluoropropylene. Being polymeric is a preferred aspect of the present invention.
  • the (perfluoroalkyl)ethylene is at least one selected from (perfluoroethyl)ethylene, (perfluorobutyl)ethylene, (perfluorohexyl)ethylene, and (perfluorooctyl)ethylene. This is a preferred embodiment of the invention.
  • the perfluoroalkyl group in the perfluoro(alkyl vinyl ether) is a perfluoroalkyl group having 1 to 10 carbon atoms.
  • the perfluoro(alkyl vinyl ether) is at least one selected from perfluoro(methyl vinyl ether), perfluoro(ethyl vinyl ether), and perfluoro(propyl vinyl ether). .
  • the comonomer is contained in an amount of 0.01 to 1.00% by mass with respect to TFE.
  • the comonomer is contained in an amount of 0.01 to 0.50% by mass with respect to TFE.
  • the specific gravity (SSG) of the copolymer is 2.27 or less.
  • the present invention also provides a dust-inhibiting treatment method for a dust-generating substance using a dust-inhibiting treatment agent powder obtained by granulating and then drying the dust-inhibiting treatment agent composition.
  • the dust suppression treatment method of the present invention can be suitably used for a dust-generating powdery substance as the dust-generating substance.
  • non-melt-flowable TFE copolymer particles that are excellent in the performance of suppressing dust from dust-generating substances and are a solid content in the dust-suppressing treatment agent composition even after being left standing for a long period of time.
  • a method for dust control treatment of dust-generating substances using a dust control agent composition having excellent redispersibility and environmental performance is provided.
  • FIG. 1 is a diagram showing the results of centrifugal sedimentation tests and centrifugal sedimentation redispersion tests of Examples 1 to 3 and Comparative Example 1.
  • FIG. 1 is a diagram showing the results of static sedimentation tests and static sedimentation redispersion tests of Examples 1 and 2 and Comparative Example 1.
  • FIG. 2 is a photograph of Example 2 and Comparative Example 1 after standing for 90 days.
  • the dust suppression treatment method for dust-generating substances of the present invention comprises a non-melt-flowable TFE copolymer aqueous dispersion, and the redispersion sedimentation rate of the copolymer represented by the above formula (1) is 60% or less. and the content of perfluorooctanoic acid and its salt in the aqueous dispersion is less than 10 ppb, and the dust suppressing treatment composition and the dust-generating substance are mixed, It is important in the present invention to fibrillate the non-melt-flowable TFE copolymer by subjecting the mixture to a compression-shearing action at a temperature of about 20 to 200° C. to suppress the generation of dust from dust-generating substances. It is a feature.
  • the TFE polymer particles which are the solid content in the dust-controlling agent composition, tend to settle.
  • the sedimented TFE polymer particles solidify and are difficult to redisperse by stirring or the like.
  • a dust suppressing treatment composition having a redispersion sedimentation rate of 60% or less, the sedimented non-melt-flowable TFE copolymer particles are suppressed from firmly solidifying, and the redispersibility is remarkably improved. It becomes possible to As a result, in the dust suppressing treatment method of the present invention, a small amount of the dust suppressing agent composition can be uniformly mixed with the dust-generating substance, so that the generation of dust from the dust-generating substance can be efficiently suppressed. becomes possible. Furthermore, since the content of persistent perfluorooctanoic acid and its salts is less than 10 ppb, it is also excellent in environmental performance.
  • the dust suppressing treatment agent composition used in the present invention has excellent redispersibility in addition to dust suppressing performance is confirmed by the centrifugal sedimentation test, the centrifugal redispersion test, and the stationary sedimentation test of Examples described later. , static sedimentation redispersion test, and falling dust generation test.
  • the redispersion sedimentation rate of the non-melt-flowable TFE copolymer aqueous dispersion used in the present invention is 60% or less.
  • Certain dust control treatment compositions have a reduced amount of sedimentation compared to aqueous TFE polymer dispersions with a redispersion sedimentation rate of greater than 60%.
  • the dust suppression treatment method of the present invention is represented by the above formula (1) of the non-melt-flowable TFE copolymer aqueous dispersion in the dust suppression treatment agent composition to be used.
  • the non-melt-flowable TFE copolymer in the dust-suppressing treatment agent composition used in the present invention has excellent sedimentation stability because it contains few rod-like particles that easily sediment.
  • the redispersion sedimentation rate shown by the above formula (1) exceeds 60%, the sedimented non-melt-flowable TFE copolymer particles solidify and become difficult to redisperse.
  • the amount of the non-melt-flowable TFE copolymer particles dispersed in the dust suppressing treatment agent composition is reduced, and is equivalent to that before sedimentation.
  • more non-melt-flowable TFE copolymer aqueous dispersion is required.
  • the strongly solidified non-melt-flowable TFE copolymer cannot be used as a dust control agent and must be discarded. It is not preferable from an economical point of view because it wastes a large amount and generates a disposal cost.
  • the non-melt-flowable TFE copolymer of the present invention is a non-melt-flowable TFE copolymer of tetrafluoroethylene and at least one comonomer selected from perfluoro(alkylvinyl ether), (perfluoroalkyl)ethylene, and hexafluoropropylene.
  • a fluid copolymer is preferred.
  • the perfluoroalkyl group in (perfluoroalkyl)ethylene is preferably a perfluoroalkyl group having 1 to 10 carbon atoms, more preferably (perfluoroethyl)ethylene, ( It is at least one selected from perfluorobutyl)ethylene, (perfluorohexyl)ethylene, and (perfluorooctyl)ethylene. More preferred is (perfluorobutyl)ethylene.
  • the perfluoroalkyl group in the perfluoro(alkyl vinyl ether) is preferably a perfluoroalkyl group having 1 to 10 carbon atoms, more preferably perfluoro(methyl vinyl ether), It is at least one selected from perfluoro(ethyl vinyl ether) and perfluoro(propyl vinyl ether).
  • the amount of the comonomer in the non-melt-flowable TFE copolymer used in the present invention is 0.01 to 1.00% by mass, preferably 0.01 to 0.50% by mass, more preferably 0.01 to 0.50% by mass, based on TFE. It is contained in an amount of 01 to 0.30% by mass.
  • the content of the comonomer is 0.01 to 1.00% by mass, the stability of the aqueous dispersion is improved because there are few rod-shaped particles that tend to settle in the solid content.
  • the content of the comonomer exceeds 1.00% by mass, fibrillation becomes difficult and thermal stability decreases, which is not preferable.
  • the content of the comonomer is less than 0.01% by mass, the effect of the comonomer cannot be expected, and the redispersion sedimentation rate is inferior, which is not preferable.
  • the melting point of the non-melt-flowable TFE copolymer used in the present invention is 320-350°C, preferably 334-342°C. If the melting point is lower than 320° C., the comonomer content in the non-melt fluidity increases and fibrillation becomes difficult, which is not preferred.
  • the non-melt-flowable TFE copolymer used in the present invention is a copolymer that does not exhibit melt-moldability at temperatures above the melting point, and conforms to ASTM D1238 (372 ° C., load 5 kg) and is a temperature higher than the melting point. It is preferable that it is a copolymer whose MFR cannot be measured at .
  • Such a non-melt-flowable TFE copolymer is a copolymer different from the TFE copolymer that has melt-flowability and can be melt-molded.
  • the specific gravity (SSG) of the non-melt-flowable TFE copolymer is desirably 2.27 or less, preferably 2.22 or less, and more preferably 2.20 or less.
  • SSG value the lower the molecular weight, and the lower the SSG value, the higher the molecular weight. A high dust suppression effect can be obtained.
  • the non-melt-flowable TFE copolymer aqueous dispersion of the present invention is an aqueous dispersion in which fine particles (colloidal particles) of a high-molecular-weight non-melt-flowable TFE copolymer are dispersed.
  • the non-melt-flowable TFE copolymer fine particles in the aqueous dispersion have a particle size (d84) of 250 nm or less, preferably 50 to 250 nm, more preferably 50 to 225 nm when the cumulative volume percentage is 84%. is desirable.
  • d84 is less than 50 nm, the effect of dust-generating substances in suppressing dust may be lower than when d84 is within the above range.
  • the particle size (d84) is 250 nm or less, unlike the case where the particle size (d50) is 250 nm or less, it means that there are no extremely large primary particles, and the sedimentation stability of the aqueous dispersion is excellent. means that
  • the concentration of perfluorooctanoic acid and its salt in the non-melt-flowable TFE copolymer aqueous dispersion was measured by placing 10 ml of the non-melt-flowable TFE copolymer aqueous dispersion in a polyethylene container in a freezer at -20°C. After freezing to agglomerate the non-melt-flowable TFE copolymer and separating it from water, the contents of the polyethylene container were all transferred to a Soxhlet extractor, extracted with about 80 ml of methanol for 7 hours, and diluted to a volume.
  • the concentration of perfluorooctanoic acid and its salts in the non-melt-flowable TFE copolymer aqueous dispersion can be calculated by measuring the sample liquid with a liquid chromatograph.
  • the method for preparing the non-melt-flowable TFE copolymer aqueous dispersion containing less than 10 ppb of perfluorooctanoic acid and its salt is not particularly limited, but the following method can be exemplified.
  • hydrocarbon-based anionic surfactants include higher fatty acid salts, higher alcohol sulfate salts, liquid fatty oil sulfate salts, fatty alcohol phosphate salts, dibasic fatty acid ester sulfonates, alkylaryl There are sulfonates and the like, especially polyoxyethylene alkylphenyl ether ethylene sulfonic acid (n of polyoxyethylene is 1 to 6, alkyl has 8 to 11 carbon atoms), alkylbenzene sulfonic acid (alkyl has 10 to 10 carbon atoms), 12) Na, K, Li and NH4 salts such as dialkyl sulfosuccinates (alkyl has 8-10 carbon atoms) impart high mechanical stability to non-melt-flowable TFE copolymer aqueous dispersions. is possible, and the non-melt-flowable TFE copolymer particles are prevented from aggregating due to high-speed agitation or the like, so it can be
  • the dust control agent composition is mixed with a dust-generating substance, the mixture is subjected to compression-shearing action at a temperature of 20 to 200° C., preferably 50 to 150° C., and the composition is By fibrillating the non-melt-flowable TFE copolymer in the product, it is possible to suppress the generation of dust from dust-generating substances. That is, when the specific non-melt-flowable TFE copolymer used in the present invention is subjected to compression-shearing action under appropriate conditions as described above, it fibrillates in a spider web-like manner and becomes ultrafine fibers. In the dust-suppressing treated material treated using the dust-suppressing treatment method, it is considered that the dust-generating substances are captured and aggregated by the spider web-like fine fibers to suppress dust.
  • Dust-producing substances that can be particularly preferably treated include, for example, cements such as Portland cement and alumina cement, slaked lime, quicklime powder, mineral powders such as calcium carbonate, dolomite, magnesite, talc, silica, and fluorite, Clay mineral powder such as kaolin and bentonite, metals such as iron and steel, slag powder by-produced in the manufacturing process of non-ferrous metals, coal, combustion ash powder such as garbage, gypsum powder, powdered metals, carbon black, activated carbon powder, metals
  • Ceramic powder such as oxides, pigments, and the like, that is, all dust-generating substances that generate dust when solid particulate matter scatters and floats in the air.
  • the amount of the dust suppressing treatment agent composition used in the present invention to be added to the dust-generating substance depends on the type of the dust-generating substance, particle size distribution, specific gravity (true specific gravity, apparent specific gravity), dust suppressing treatment temperature, compression-shearing action to be applied. It can be appropriately set depending on the degree of dust suppression, the degree of dust suppression of the obtained dust-suppressed product, and the like.
  • the dust suppressing treatment composition is preferably 0.001 to 1.0% by mass in terms of the non-melt-flowable TFE copolymer resin solid content with respect to the dust-generating substance. is added in the range of 0.005 to 0.50% by mass, it is possible to suppress dust generated from dust-generating substances.
  • Absorbance ratio X (C - B) / (A - B) (3)
  • C 875 cm -1 peak height (absorbance)
  • a calibration curve is created from the PFBE content (mass%) of two samples whose PFBE content (mass%) is known and the absorbance ratio X, and the PFBE content (mass%) of the sample is calculated from the absorbance ratio X of the sample. asked.
  • Solid content mass% Weigh less than 6 g of the non-melt-flowable TFE copolymer aqueous dispersion or the TFE polymer aqueous dispersion into a tared aluminum dish, and add the non-melt-flowable TFE copolymer aqueous dispersion, or The mass of the TFE polymer aqueous dispersion (mass before drying) was weighed (measured to four decimal places). After that, leave it for 2 hours in a dryer at 105 ° C. to remove moisture, bake at a constant temperature of 380 ° C. for 20 minutes and cool to room temperature, then weigh the mass (mass after drying) and use the following formula (8 ) to calculate the solid content mass %.
  • Solid content mass% [(mass after drying - tare mass of aluminum pan) / mass before drying] x 100 (8)
  • Redispersion sedimentation rate X 7 /X 6 ⁇ 100 (13)
  • X 6 15 g of the TFE polymer aqueous dispersion shown in Comparative Example 1 was allowed to stand at room temperature for 30 days, 60 days, and 90 days after closing the mouth of the centrifuge tube, and then sedimented. After removing non-solid content (liquid portion: supernatant and unsettled solid content), leaving the centrifuge tube upside down for 30 minutes to further remove the liquid portion, and re-dispersing, the following formula ( 14) is the solid sedimentation ratio (%).
  • Drop dust generation test 200 g of the sample (dust-suppressed product) is allowed to fall naturally from the top inlet of a cylindrical container with an inner diameter of 39 cm and a height of 59 cm, and the amount of floating dust in the container at a height of 45 cm from the bottom (relative concentration (CPM: Counts per Minute) ) was measured with a scattered light digital dust meter. The amount of floating dust was measured five times continuously for one minute after the sample was added, and the geometric mean value of the values obtained by subtracting the measured value (dark count) before the sample was added. x (CPM) was taken as the “falling dust generation amount” of the sample, and the geometric mean value x was obtained by the following formula (15).
  • TFE tetrafluoroethylene
  • Example 5 and 6 Comparative Examples 3 and 4
  • the non-melt-flowable TFE copolymer aqueous dispersion or TFE polymer aqueous dispersion prepared in Example 2 or Comparative Example 1 was added in an amount shown in Table 3 (solid content mass% relative to the dust-generating substance). Weigh the mass, dilute with water so that the total amount of water and water contained in the non-melt-flowable TFE copolymer aqueous dispersion or TFE polymer aqueous dispersion is 100 g, and prepare the composition.
  • a mixture of dust-inhibiting treated quicklime and slaked lime was obtained in the same manner as in Example 4, except that a dispersed dispersion was used.
  • a drop dust generation test was conducted on the obtained dust-suppressing treated material. Table 3 shows the results.
  • Examples 16-20, 22, 25-28, 31 The dust-generating substances shown below and the non-melt-flowable TFE copolymer aqueous dispersions prepared in Examples 7 to 13 were added in the amounts shown in Table 5 or Table 6 (mass% of solid content relative to the dust-generating substance). Weigh a mass equivalent to , and use a dispersion diluted with water so that the total amount of water and water contained in the non-melt-flowable TFE copolymer aqueous dispersion is 35 g. A dust-suppressing treatment was obtained. A drop dust generation test was conducted on the obtained dust-suppressing treated material. The results are shown in Table 5 or Table 6.
  • 500 g of heated anhydride gypsum was weighed into a container of a mortar mixer, and the dispersion diluted with water (the mass of the non-melt-flowable TFE copolymer corresponding to the addition amount shown in Table 5 or Table 6 + 35 g of water ) is put into a mortar mixer and stirred at a low speed for 1 minute, 500 g of anhydride gypsum heated to 105 ° C. is added and stirred for 3 minutes, spread evenly on an enamel tray, and heated at 105 ° C. for 1 hour. A mixture was obtained. About 1 kg of the mixture was placed in a mortar and stirred with a pestle for 9 minutes to obtain a dust-suppressing treatment.
  • Ground granulated blast furnace slag (2.0 mm standard mesh sieve through, 1.0 mm standard mesh sieve through, 600 ⁇ m standard mesh sieve residue 0.02%, 300 ⁇ m standard mesh sieve residue 0 0.06%, granulated blast furnace slag with a 150 ⁇ m standard mesh sieve residue of 0.31% and a 150 ⁇ m standard mesh sieve passage of 99.61%)
  • Dust-proof treatment of ground granulated blast furnace slag (Examples 18 and 27): A dust-suppressing treated product was obtained in the same manner as the dust-proofing treatment of anhydrous gypsum, except that granulated granulated blast furnace slag was used.
  • Dolomite (2.0 mm standard mesh sieve through, 1.0 mm standard mesh sieve residue 0.06%, 600 ⁇ m standard mesh sieve residue 0.50%, 300 ⁇ m standard mesh sieve residue 3.44 %, Dolomite with 150 ⁇ m standard mesh sieve residue 8.20%, 150 ⁇ m standard mesh sieve passage 87.79%) Dustproof treatment of dolomite (Examples 19 and 28): 500 g ⁇ 2 of dolomite was weighed, spread evenly on an enamel tray, and heated at 105° C. for one day and night.
  • 500 g of heated dolomite was weighed into a container of a mortar mixer, and the dispersion diluted with the above water (the mass of the non-melt-flowable TFE copolymer corresponding to the addition amount shown in Table 5 or Table 6 + 35 g of water). is put into a mortar mixer and stirred at a low speed for 1 minute, 500 g of dolomite heated to 105 ° C. is added and stirred for 3 minutes, spread evenly on an enamel tray, heated at 105 ° C. for 1 hour to make the mixture Obtained. About 1 kg of the mixture was placed in a mortar mixer and stirred for 3 minutes to obtain a dust-suppressing product.
  • lignite powder was added in 3 portions of 1/4 each and mixed, then spread evenly on an enamel tray and heated at 105° C. for 1 hour to obtain a mixture.
  • About 500 g of the mixture was placed in a mortar and mixed with a pestle until the non-melt-flowable TFE copolymer was sufficiently fibrillated to obtain a dust-suppressing treatment.
  • the dust suppression treatment method of the present invention is used in the fields of building materials, soil stabilizers, solidifying materials, fertilizers, landfill disposal of incineration ash or hazardous substances, explosion-proof fields, cosmetics fields, fillers for various plastics, etc. , it is suitably used for obtaining a dust-suppressing treated product of the dust-generating substance by subjecting the dust-generating substance to dust-suppressing treatment.

Abstract

La présente invention concerne un procédé de traitement d'élimination de poussière servant à éliminer la poussière d'une substance produisant de la poussière, caractérisé en ce qu'une composition d'agent de traitement d'élimination de poussière composée d'une dispersion aqueuse de copolymère de tétrafluoroéthylène pouvant s'écouler à l'état fondu est utilisée, le taux de sédimentation de redispersion du copolymère étant inférieur ou égal à 60 %, la quantité d'acide perfluorooctanoïque et de ses sels étant inférieure à 10 ppb par rapport à la masse de la dispersion aqueuse, la composition d'agent de traitement d'élimination de poussière étant mélangée avec une substance produisant de la poussière, le mélange étant soumis à une action de cisaillement par compression à une température de 20-200 °C, le copolymère de tétrafluoroéthylène étant fibrillé pour éliminer la génération de poussière par la substance produisant de la poussière. Le procédé de traitement d'élimination de poussière possède un effet exceptionnel d'élimination de poussière, présente une redispersibilité exceptionnelle des particules de copolymère de tétrafluoroéthylène pouvant s'écouler à l'état fondu, qui équivalent à la fraction de solides dans la composition d'agent de traitement d'élimination de poussière, après que ladite composition est laissée au repos pendant une longue période, et est en outre doté de performances environnementales exceptionnelles.
PCT/JP2022/044903 2021-12-06 2022-12-06 Procédé de traitement d'élimination de poussière WO2023106288A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017382A1 (fr) * 1995-11-09 1997-05-15 Daikin Industries, Ltd. Poudre fine de polytetrafluoroethylene, sa fabrication et son utilisation
JP2010037365A (ja) * 2008-07-31 2010-02-18 Daikin Ind Ltd 含フッ素ポリマーの製造方法。
JP2011236436A (ja) * 2011-08-16 2011-11-24 Nippo Corp 塵埃抑制処理方法
JP2012077312A (ja) * 2012-01-11 2012-04-19 Du Pont Mitsui Fluorochem Co Ltd 塵埃処理剤組成物
WO2015020100A1 (fr) * 2013-08-09 2015-02-12 ダイキン工業株式会社 Procédé d'analyse d'un article contenant un agent de traitement de surface contenant du fluor
JP2020189795A (ja) * 2019-05-21 2020-11-26 ダイキン工業株式会社 フルオロアルキルカルボン酸またはその塩の製造方法
JP2021042175A (ja) * 2019-09-12 2021-03-18 株式会社ニッペコ 抗菌・防カビ処理剤

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017382A1 (fr) * 1995-11-09 1997-05-15 Daikin Industries, Ltd. Poudre fine de polytetrafluoroethylene, sa fabrication et son utilisation
JP2010037365A (ja) * 2008-07-31 2010-02-18 Daikin Ind Ltd 含フッ素ポリマーの製造方法。
JP2011236436A (ja) * 2011-08-16 2011-11-24 Nippo Corp 塵埃抑制処理方法
JP2012077312A (ja) * 2012-01-11 2012-04-19 Du Pont Mitsui Fluorochem Co Ltd 塵埃処理剤組成物
WO2015020100A1 (fr) * 2013-08-09 2015-02-12 ダイキン工業株式会社 Procédé d'analyse d'un article contenant un agent de traitement de surface contenant du fluor
JP2020189795A (ja) * 2019-05-21 2020-11-26 ダイキン工業株式会社 フルオロアルキルカルボン酸またはその塩の製造方法
JP2021042175A (ja) * 2019-09-12 2021-03-18 株式会社ニッペコ 抗菌・防カビ処理剤

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