203 results about "Perfluorooctane" patented technology

Described are fluorochemical surfactants derived from nonafluorobutanesulfonyl fluoride that contain polyalkyleneoxy side chains and may be copolymerized with acrylic acid or methacrylic acid to form polyacrylates or polymethacrylates. The surfactants surprisingly lower the surface tension of water and other liquids in the same or similar low values achieved by premier surfactants such as those derived from perfluorooctane sulfonyl fluoride.

Described are fluorochemical surfactants derived from nonafluorobutanesulfonyl fluoride that contain polyalkyleneoxy side chains and may be copolymerized with acrylic acid or methacrylic acid to form polyacrylates or polymethacrylates. The surfactants surprisingly lower the surface tension of water and other liquids in the same or similar low values achieved by premier surfactants such as those derived from perfluorooctane sulfonyl fluoride.

The invention discloses a method for preparing a water-oil repellent fluorine-containing textile finishing agent, comprising the following steps of: adding a fluorine-containing alkyl (methyl) acrylate monomer, a higher fatty alcohol (methyl) acrylate monomer, a cross-linking monomer, an emulsifying agent, a solvent, a chain transfer agent and the like into a container in sequence, dropwise adding deionized water at 30-80 DEG C, shearing at high speed for pre-emulsification, carrying out high-pressure homogenization or ultrasound on a pre-emulsified solution, adding an initiator, and polymerizing for 0.5-8h at 50-80 DEG C. The obtained finishing agent has small particle size, uniform polymer composition and favorable properties of mechanical stability, pH stability, chemical stability, dilution stability and storage stability, and contains no components such as PFOS / PFOA (Perfluorooctane Sulfonates / Perfluorooctanoic Acid) and the like harmful to human bodies, and textiles finished with the finishing agent have favorable water-oil repellent property and has lower cost in comparison with like products.

The invention provides a preparation method for a print adsorbent of chitosan molecules, which relates to a preparation method for an adsorbent that can selectively remove perfluorooctane sulfonate (PFOS) in water. The preparation method adopts a molecular imprinting technique to construct a plurality of specific adsorption sites and the worthy adsorbent has remarkable selectivity adsorption to the PFOS in water. The method takes chitosan as raw material to prepare micro-cross linking chitosan beads; then the chitosan beads are printed with template molecules PFOS for 5 to 24 hours in an acid water solution, a mass ratio between the template molecules and the micro-cross linking chitosan beads is 0.005 to 0.06: 1, and reaction with a cross linker is carried out for 2 to12 hours after printing; the mass ratio between the volume of the cross linker and the micro-cross linking chitosan beads after being printed is 0.0125 to 0.119ml / g; finally, an organic solvent is used for eluting for 1 to 8 hours and the print adsorbent of chitosan molecules is obtained after freeze-drying. The adsorbent is suitable for adsorbing and removing PFOS in complicated water substances and is characterized by strong selectivity and being able to be reused.

The invention relates to an environment-friendly water-based extinguishing agent, which relates to an extinguishing agent. The compositions with weight percentage are as follows: a reagent: 4 to 6 percent of butanol, an extinguishing agent intensifier: 3 to 12 percent of perfluorooctane surfapropyl betaine, a flame retardant: 2 to 8 percent of poly ammonium phosphate, a vesicant: 0.8 to 2.6 percent of dodecyl sulphate sodium salt, a thickener: 0.2 to 0.9 percent of xanthan, an antifreeze: 8 to 18 percent of glycol, a neutralizer: 0.5 to 1.4 percent of triethanolamine, a stabilizing agent: 0.015 to 0.04 percent of sodium hydroxide, an asphyxia ingredient: 0.2 to 1.4 percent of benzotriazole, and a dissolution ingredient: 50-75 percent of pure water. The environment-friendly water-based extinguishing agent meets the needs of normal storage and use under the climate condition of high temperature of 63 DEG C and low temperature of minus 42 DEG C, and has a plurality of functions such as environmental protection, high efficiency and cold resistance.

The invention relates to a reversible emulsifier and a preparation method thereof, and an environment-friendly reversible emulsifying drilling liquid and application. The reversible emulsifier is prepared from the following raw materials: initial raw materials: C10-C20 alkyl primary amine, C10-C20 alkyl sulfonic acid, perfluorooctane sulfonate and chloroacetic acid; additives: isopropanol, peregal O-15, and peregal O-8. The environment-friendly reversible emulsifying drilling liquid is prepared by the following steps of stirring an oil phase, the reversible emulsifier and a water phase at high speed, adding alcohols with carbon number less than 4, straight-chain alcohols with carbon number of 8 to 14, quaternary ammonium salt-modified organobentonite, humic acid filtrate loss reducer, calcium oxide and choline chloride, and then adding weighing material, so as to reach the required density of the drilling liquid. The invention also provides a phase transfer method of the reversible emulsifying drilling liquid. The phase transfer method has the advantages that according to production requirements, the phases of the drilling liquid can be conveniently transferred, and the drilling liquid is stable under the two states of W / O (water / oil), and O / W (oil / water), and can be repeatedly used.

The invention relates to a cold-resistant anti-fusible aqueous film forming foam extinguishing agent. The cold-resistant anti-fusible aqueous film forming foam extinguishing agent consists of the following gradients in percentage by mass: 12-30 percent of a composite hydrocarbon surfactant, 4-6 percent of a compounded fluorocarbon surfactant, 0.5-1 percent of a foam stabilizer, 20-50 percent of an antifreeze agent, 3-5 percent of a solubilizer and the balance water, wherein the composite hydrocarbon surfactant is a composition of an ampholytic surfactant and a nonionic surfactant. The cold-resistant anti-fusible aqueous film forming foam extinguishing agent disclosed by the invention is mainly applied to prevention and extinguishing of fire caused by hydrocarbon substances and polar solvents (water-soluble substances), can be normally used at an environment temperature of -25 DEG C and is especially applicable to storage and use in extremely-cold regions. Besides, by adopting a daily-necessity-level hydrocarbon surfactant and a fluorocarbon surfactant which is free of PFOS (Perfluorooctane Sulfonates), the cold-resistant anti-fusible aqueous film forming foam extinguishing agent disclosed by the invention is good in degradation property, quick and safe in degradation and free of environmental pollution.

The invention relates to the technical field of water treatment and particularly relates to an advanced reduction method and device for rapidly removing perfluoro-compounds from water. The method comprises the following steps: adding sodium sulfite into wastewater to be treated; putting the sodium sulfite added wastewater into a magnetic stirrer, starting to carry out stirring, and stably maintaining the stirring for 15 minutes in a dark place; putting the stirred wastewater into an inert quartz reaction vessel, opening a slide damper, carrying out high-strength ultraviolet-light source irradiation on the wastewater to be treated, starting to carry out timing, closing the slide damper until selected reaction time reaches, stopping irradiation, and carrying out sampling; determining the PFOA (Perfluorooctanoic Acid) / PFOS (Perfluorooctane sulfonates) concentration of a sample by using a liquid chromatogram-triple quadrupole mass spectrometer, determining fluorine ion concentration by using a fluoride-ion electrode, and calculating a defluorination ratio. According to the method and the device, efficient degradation and defluorination for PFOA / PFOS can be achieved under mild conditions, a photocatalyst is not required to be added during reaction, the cost is reduced, the reaction is rapid, final products are F<->, SO4<2-> and partial fluorinated olefins or alkanes, no secondary pollution is caused, and the aims of high efficiency and low consumption are truly achieved.

The invention relates to a fluorine-containing polyether acrylate polymer and a preparation method thereof. The structural formula of the polymer is shown in the specifications. The preparation method comprises the following steps of: (1) dissolving an emulsifier into a solvent, and stirring at the temperature of 20-200 DEG C for 2-24 hours to obtain an emulsion; (2) dropwise adding a functional monomer and fluorine-containing polyether acrylate into the emulsion respectively, stirring at the temperature of 20-200 DEG C for 2-24 hours, and performing ultrasonic treatment for 2-24 hours to obtain a pre-emulsion; and (3) under the protection of N2, heating to 20-200 DEG C, dropwise adding an initiator into the pre-emulsion, and reflowing for 2-24 hours. The fluorine-containing polyether acrylate polymer has the advantages of easiness for biodegrading, low environmental pollution and simple preparation method; and perfluoropolyether is adopted instead of long chain perfluoralkane, so that the defects of non-biodegradability of long chain perfluoralkane and harm of perfluoroctane sulphonated substance serving as a raw material of long chain perfluoralkane to human beings are overcome.

The invention provides a method for rapidly detecting the content of perfluor octyl sulfonic acid (PFOS) and perfluor octylic acid (PFOA), which comprises the following steps: firstly, weighing a sample in a glass bottle, adding extract liquor, extracting and then filtering; then detecting the approximate content of PFOS and PFOA in the sample extract liquor by an HPLC-MS (directly carrying out mass spectrum (MS) detection without the process of a chromatographic column); if the content of the PFOS and the PFOA in the sample extract liquor is smaller than 50ppb, judging that a sample is feminine; and if the content of the PFOS and the PFOA in the sample extract liquor is larger than 50ppb, detecting the precise content of the PFOS and the PFOA in the sample by the HPLC-MS. The invention can rapidly detect the content of the PFOS and the PFOA in a plastic product, an electronic and electric product part and paper by a direct MS detection method, greatly improve the detecting speed and save the detecting time and cost and is worthy of popularizing.

The invention discloses a method for detecting total amount of perfluorooctane sulphonates (PFOS) in textile and leather, which sequentially comprises the following steps: solvent extraction of a sample, chemical treatment of extract liquid, purification and liquid chromatogram-mass spectroscopy. According to the invention, as PFOS in the sample are extracted by methanol with assist of ultrasonic wave, the extraction efficiency is high, the effect is obvious, and the operation is simple; a specific chemical cracking treatment is adopted so that the PFOS is decomposed into equivalent octanesulfonic acid and the measurement of perfluorooctane sulfonyl content in PFOS is realized; filler is adopted to purify the chromatographic column of silica gel, and interference of impurities in the extract liquid (oil, dye) on the liquid chromatogram-mass spectroscopy process is effectively reduced; and compared with the prior test technology, the method disclosed by the invention realizes analytical detection on the total amount of PFOS in the sample.

The invention belongs to the novel material field, and relates to a magnetic nano composite, and especially relates to the magnetic nano composite with high adsorption capacity capable of selectively indentifying perfluorochemicals and a preparation method thereof, which can solve the problem of single identification mechanism and non-ideal selectivity of the adsorbent in prior art. The method is characterized in that the hydrophilic group-modified Fe3O4 nano particles can be taken as a substrate, a one step method is used for synthesizing perfluorooctane and amido-functionalized magnetic nano composite, and the preparation method has the advantages of simple and rapid process, low cost and easy operation. The perfluorochemicals identification by the material is based on fluorine-fluorine interaction and electrostatic attraction, specific recognition capability and adsorption capacity on the target analysis objects can be obviously increased; the prepared magnetic nano composite is in a core-shell structure, surface adsorption endows rapid adsorption power characteristic to the material, the material has good magnetic responsibility, so that the magnetic nano composite has wide application prospect and development space in environment monitoring and pollution controlling fields.

The invention discloses a preparation method of a magnetic mesoporous carbon nitride adsorbent and a method for removing perfluorooctane compounds in water. The method comprises the following steps of: based on mesoporous carbon nitride as a matrix, and ammonium ferrous sulfate and ammonium ferric sulfate as an iron source, adjusting the alkaline environment of the liquid by ammonia water; and performing co-precipitin reaction in water bath condition. The saturation magnetization of the magnetic mesoporous carbon nitride prepared is 6.37emu / g. The magnetic mesoporous carbon nitride is used for removing perfluorooctane compounds [PFOS (Perfluorooctane sulfonates)] and [PFOA (Perfluorooctanoic acid)] in water, so that a good removal effect is obtained and adsorption equilibrium is quickly realized. Meanwhile, the magnetic mesoporous carbon nitride adsorbent provided by the invention can be recovered by additionally applying a magnetic field to the benefit of repeated use. The adsorbent provided by the invention has an important meaning for adsorption removal of perfluorooctane compounds, and has a good application prospect in wastewater treatment.

The invention relates to the technical field of superamphiphobic materials and in particular relates to a preparation method for a polyurethane / molybdenum disulfide super-hydrophobic and super-oleophobic coating layer. According to the preparation method, a polyurethane / molybdenum disulfide composite micron / nano-level rough surface is prepared; the contact angle between the surface of the coating layer and water is larger than 150 degrees; the coating layer is modified through 1H, 1H, 2H, 2H-perfluorooctane oxygroup trichlorosilane, so that the surface of the obtained coating layer is superamphiphobic. The superamphiphobic surface repels water, glycerinum, ethylene glycol, colleseed oil, cetane and the like; the contact angle between the superamphiphobic surface and the water is larger than 160 degrees, and a rolling angle is smaller than 3 degrees; the contact angle between the superamphiphobic surface and liquid such as cetane and the colleseed oil is larger than 150 degrees, and rolling angles are all smaller than 10 degrees. The superamphiphobic coating layer prepared by the preparation method is high in stability and can be sprayed to different materials; furthermore, the technology is simple; large-area preparation of the superamphiphobic surface is facilitated, and industrial manufacturing is facilitated.

The invention relates to a cold-resistant aqueous film forming foam extinguishing agent. The cold-resistant aqueous film forming foam extinguishing agent is prepared from the following components in percentage by mass: 12 to 30% of a composite hydrocarbon surfactant, 2 to 5% of a fluorocarbon surfactant, 0.1 to 1% of a foam stabilizer, 20 to 50% of an antifreeze agent, 3 to 5% of solubilizer, and the balance of water, wherein the composite hydrocarbon surfactant is a composition of an ampholytic surfactant and a nonionic surfactant. The cold-resistant aqueous film forming foam extinguishing agent is applicable to extinguishing of fire caused by hydrocarbon substances, can be normally used at the environmental temperature of -25 DEG C, and in particularly suitable for the super cold area; in addition, the hydrocarbon surfactant at grade of daily necessities, and the fluorocarbon surfactant free of PFOS (Perfluorooctane sulfonates) are adopted, so that the cold-resistant aqueous film forming foam extinguishing agent is high in degrading performance, can be quickly and safely degraded, and is free of environmental pollution.

The invention discloses a method for synthesizing a novel adsorbing material capable of selectively absorbing perfluorooctanic acid (PFOA) and perfluorooctane sulfonate (PFOS) in water environments by means of a Molecular imprinting technique (MIT). The method comprises the steps that a bi-functional monomer molecular imprinted polymer (TMFAA / 4-Vpy-MIP) is synthesized by selecting 2-(Trifluoromethyl)acrylic acid (TFMAA) and 4-Vinylpyridine (4-Vpy) as bi-functional monomers, selecting PFOA as a template molecule and selecting EDMA as a cross-linking agent; the polymer can efficiently and selectively absorb and remove PFOA and PFOS in a water phase simultaneously, wherein the adsorption rate for PFOA reaches 78.8%, the adsorption rate for PFOS reaches 76.7%, the removal rate of adsorption for short chains PFCs (PFBA, PFPA, PFHpA and PFBS) is only 13.2% to 47.6%, the removal rates of adsorption for long chains PFCs (PFNA, PFDA, PFUnA and PFDoA) are 65.0%, 67.0%, 68.7% and 65.1% respectively, and the adsorption rate for PFHpA is only 12.8%. After the novel absorbing material is repeatedly used five times, the adsorption rate can still reach 74.9% to 93.5%. The synthesized TFMAA / 4-Vpy-MIP has good selective adsorptivity and renewability and can be used for adsorption removal of PFOA and PFOS in various water environments.

The invention provides an environment-friendly super-hydrophobic oil-resistant surface treating agent for a textile. The surface treating agent mainly comprises the following raw materials by weight: 1 to 15 parts of a fluorine-containing compound, 1 to 5 parts of a silicon-containing compound, 1 to 15 parts of a fluorine-silicon copolymer, 0.5 to 5 parts of a silane coupling agent and 50 to 95 parts of a solvent. The surface treating agent is prepared by subjecting the above-mentioned raw materials to a reaction at 5 to 45 DEG C for 0.5 to 3 h. The surface treating agent has good hydrophobicity to the textile. The invention has the following advantages: the synthetic method for the surface treating agent is simple and is convenient for large-scale production; the surface treating agent can endow the textile with super-hydrophobicity, oil resistance and antifouling property; the surface treating agent is environment-friendly and does not contain perfluorocapylic acid (PFOA) and perfluorooctane sulfonate (PFOS) compounds; the surface treating agent is simple and convenient to use and applicable to manners like spraying, dip-coating and brush coating; the surface treating agent has a fast drying speed, can be used at room temperature and is free of requirements for special treatment; and the surface treating agent is applicable to a textile made of cotton, hemp, wool, silk, pile, fiber, leather or the like.

The invention provides a method for quantitatively detecting perfluorooctane sulfonate isomeride in a water sample, which belongs to the field of perfluorooctane sulfonate monitoring. The method for quantitatively detecting the perfluorooctane sulfonate isomeride in the water sample comprises the steps of (1) solid phase extraction: quantitatively taking the water sample, carrying out extraction with a solid phase extraction column, carrying out centrifugation to eliminate moisture in the extraction column after extraction, then purifying the dried extraction column by a buffer solution and methanol, eluting the purified extraction column with alkaline methanol, and collecting an eluant; (2) chemical processing of an extract: drying nitrogen of the eluant with wind, adding derivatization reagents, tetrabutylammonium hydroxide and methyl tertiary butyl ether, to be mixed, drying the solution nitrogen with wind, and adding the methyl tertiary butyl ether to be uniformly mixed so as to keep the volume constant; and (3) gas chromatography-mass spectrometric detection. The method successfully realizes the effective separation of the PFOS (perfluorooctane sulfonate) isomeride so as to realize the accurate and quantitative detection of the PFOS isomeride. Compared with the existing test technology, the method realizes the quantitative analysis and detection of the PFOS isomeride, and solves the problem of quantitative errors of PFOS.

The invention discloses a preparation method of a nano coated Ti / SnO2-Sn-Ce electrode and a process and a method for utilizing the same for degradation of perfluorooctane sulfonate in water, and belongs to the technical field of electrochemistry. Perfluorooctane-sulfonate-containing waste water is subjected to electrolytic oxidation by utilizing the nano coated Ti / SnO2-Sn-Ce electrode as an anode and Ti or 304 stainless steel as a cathode. The preparation method is characterized in that perfluorooctane sulfonate can be subjected to fast degradation under mild conditions. By means of electrochemical oxidation, the preparation method is simple in process procedures, convenient to operate, mild in reaction conditions, excellent, stable and reliable in treatment effect and easy to realize industrial application. The nano coated Ti / SnO2-Sn-Ce electrode has the advantages of high oxidation performance, long service life, easiness in processing, low cost and the like.

The invention discloses a perfluoro-capillary extraction monolithic column and a preparation method and application thereof. The perfluoro-capillary extraction monolithic column is a monolithic column in which silica gel matrix is polymerized in situ in a quartz capillary tube with diameter of 75 to 530 microns and perfluoro functional groups are bonded on the surface of the silica gel matrix. The perfluoro functional groups comprise perfluoro-octyl (C6F13), perfluoro-decyl (C8F17), N-perfluorooctanoic sulfonyl and derivatives thereof. The monolithic column can be used for enriching a series of trace perfluoro-chemicals, such as perfluorooctane sulfonate (PFOS), perfluorooctane carboxylate (PFOA), perfluorodecanoate (PFDA), perfluorohexyl sulfonate (PFHXS) and the like. The preparation method of the monolithic column is simple, fast and reliable, the average adsorption quantity can reach over 6.0*10<-2>mug, and the average enrichment times is 30 times; the average recovery rate is over 90 percent, the sensitivity of analysis and detection is greatly improved, and interference of impurities is avoided; and the monolithic column is convenient and fast to carry, a trace perfluoro-chemical sample can be directly enriched at a remote acquisition point, the transport cost is reduced, and the analysis time is shortened.

The invention discloses a modified silanized metal surface pre-treating agent containing octylphenol polyoxyethylene ether. The pre-treating agent is prepared from the following raw material components in parts by weight: 100 parts of de-ionized water, 10-15 parts of modified coupling agent, 10-15 parts of propyl alcohol, 30-40 parts of silane coupling agent 791, 20-30 parts of silane coupling agent KH-570, 0.001-0.003 part of sodium perfluorooctane sulfonate, 0.3-0.5 part of tree ash, 4-6 parts of polyvinyl acetate emulsion, 2-3 parts of urea, 0.4-1.0 part of phenylethylphenol polyoxyethylene ether, 0.2-0.8 part of octylphenol polyoxyethylene ether, 0.005-0.01 part of lanthanum nitrate, and 0.1-0.3 part of phytic acid. By adopting coupling agent modification and compounding, and adding auxiliary agents, the mixture reacts to obtain the end product. The modified silanized metal surface pre-treating agent has the characteristics of being non-toxic, environment-friendly, and convenient to use; and a silane film is compact, uniform, large in adhesive force and good in corrosion resistance.

The invention discloses a preparation method of perfluorinated octane. The method includes the following steps: (1) filling a reactor with a catalyst, and carrying out fluoridation treatment with a fluridizer at high temperature; (2) adding octane into a vaporizer to obtain an octane steam, and controlling the vaporizer temperature between 100-150 DEG C; (3) introducing inert gas into the vaporizer, diluting the octane steam, and continuously introducing the octane steam diluted mixed gas into the reactor to carry out a fluoridation substitution reaction with the fluridizer; and (4) carrying out alkali washing, water washing and rectifying purification on the reaction product, to obtain the perfluorinated octane. The perfluorinated octane obtained by the preparation method disclosed by the invention can be used as a pulmonic cavity ventilating liquid or used in manufacture of ophthalmic surgical instruments.

The invention discloses a moisture-resistant reflective thermal insulation coating and a preparation method thereof. The moisture-resistant reflective thermal insulation coating is prepared from the following raw materials by weight: 40-60 parts of pure acrylic emulsion, 4-8 parts of hollow microsphere powder, 3-6 parts of silica aerogel powder, 2.5-4.5 parts of porous calcium phosphate, 5-10 parts of titanium dioxide, 1-2 parts of 4-chloro-N-(stearamide methyl)pyridine, 4.5-6.5 parts of compound nano powder, 3-5 parts of polytetrafluoroethylene ultrafine powder, 2-3 parts of sodium methyl silicate, 1-2 parts of potassium perfluorooctane sulfonate, 0.05-0.1 part of 2-methyl-4-isothiazolin-3-one, 0.4-0.8 part of a dispersant HT-5020, 0.3-0.6 part of a defoaming agent T-607, 0.1-0.3 part of a moistening agent X-405, 2.5-3 parts of a film-forming assistant K-12, 0.6-1.2 parts of a thickening agent YK-AR-2 and 0.5-1 part of a leveling agent B333. The reflective thermal insulation coating has excellent moisture-resistant and waterproof performances, can inhibit water vapor condensation, can prevent oxidation of a thermal insulator surface, can keep very good thermal insulation performances in a humid environment for a long time, has good properties of high temperature resistance, weather resistance, ultraviolet radiation aging resistance, acid and alkali resistance, bacteria resistance and mildew resistance, and is a coating that can reduce temperature and save energy at a normal temperature, is environment-friendly and has a long service life.

The present invention relates to a method for preparing a cookware coating free of perfluorooctane sulfonate. The coating comprises a base layer and a surface layer. The base layer coating comprises the following raw materials in parts by weight: bismaleimide resin, modified polyvinylidene fluoride resin, a high temperature resistant pigment filler, silicone modified polyurethane resin, polyetheretherketone PEEK and nano-silica. The surface layer coating comprises the following raw materials in parts by weight: polytetrafluoroethylene resin, polypyrrole, acrylic latex, promoting epoxy resin, a catalyst, polyethylene wax and nano silver. The wear resistant antibacterial non-stick pan coating prepared by using the method provided by the present invention is chemically stable at the cooking temperature and does not generate the harmful substance PFOA. The coating has higher hardness, so as to prevent spatulas or spoons from damaging the surface coating of the non-stick pan. The non-stick pan prepared by using the coating has a low cost and a long service life.

The invention discloses a quick detection method for resonance light scattering of perfluorooctane sulfonate (PFOS) in an environmental water sample, and relates to the field of environmental analysis. A resonance light scattering analysis method is adopted in the method. The method comprises the following steps of: sequentially adding 0.40mL of 4.2*10<-4>mol / L rhodamine 6G solution and 1.0mL of butadiene rubber (BR) buffer solution with pH of 3.29 into a 10mL color comparison tube, swirling the solution uniformly, and adding the pretreated water sample to be detected; after uniform swirling mixing, fixing the volume to 10mL by using 18.2Momega ultrapure water, and immediately performing synchronous scanning on a fluorescence spectrophotometer in lambda ex=lambda em, wherein both the excitation slit and the emission slit are 5 nanometers, and the voltage is 400V; recording the scattered spectrum in a wavelength range of 220 to 420 nanometers; and performing preliminary qualitative analysis and quantitative analysis on whether the environmental water sample contains the PFOS according to the scattered signals at the wavelength of 313 nanometers. If the water sample contains the PFOS, the scattering intensity at the wavelength of 313 nanometers is enhanced; otherwise, the scattered signals at the wavelength of 313 nanometers are not changed. The invention is characterized in that: the method for detecting the PFOS in the environmental water sample is simple, quick and sensitive, and low in detection cost.

The invention relates to a production method for organic fluorine, in particular to a production process for perfluorooctane sulfonyl fluoride. The method comprises the following steps: (1) taking bromooctane as raw material, taking alcohol as solvent, and carrying out sulphonation through Na2SO3 to obtain CH3(CH2)7SO3Na; (2) chloridizing CH3(CH2)7SO3Na through phosphorus oxychloride to obtain CH3(CH2)7SO2Cl; (3) fluorinating CH3(CH2)7SO2Cl with triethanolamine as a catalyst to obtain CH3(CH2)7SO2F; (4) distilling CH3(CH2)7SO2F, collecting distillate within the temperature range from 110 DEG C to 120 DEG C to obtain high-purity octane sulfonyl fluoride; and (5) electrolyzing the high-purity octane sulfonyl fluoride to obtain perfluorooctane sulfonyl fluoride. The production method has the advantages of simple process and high yield.

The invention discloses a fluorination liquid composition and application thereof in a transformer. The fluorinated liquid composition is prepared from hexafluoropropylene dimer, hexafluoropropylene trimer, perfluorohexanone, perfluoroheptane, perfluorooctane, perfluoropentane, perfluorohexane, perfluorotripropylamine, perfluorotributylamine, perfluorotriamylamine, perfluoro-N-methylmorpholine, perfluorocyclic ether, perfluoropropyl methyl ether, perfluorobutyl methyl ether and perfluorobutyl ethyl ether. Any four of the perfluoro-2-methyl pentane-3-methoxy ether, the perfluoro-2-methyl hexane-3-ethoxy ether and the C8 cyclic ether mixture are respectively marked as a first component, a second component, a third component and a fourth component. Compared with traditional transformer oil, the fluorination liquid composition has better fluidity, thermal conductivity, heat dissipation, insulativity, high boiling point, low freezing point, low density and the like, and due to the advantages of environmental friendliness, oxidation resistance, low acid value and the like, the fluorination liquid composition is applied to a transformer, the defects of an existing transformer medium are reduced, and the service life of the transformer is prolonged.

The invention discloses an immersed liquid phase change cooling medium and application thereof in a cooling system of electronic equipment, wherein the cooling medium is a mixture formed by mixing one, two or three of perfluoro-4-methyl-2-pentene, a hexafluoropropylene tripolymer, perfluorohexanone, perfluoroheptane, perfluorooctane, perfluoro-2-methyl-2, 3-epoxy pentane, perfluorohexane and perfluoropentane. The immersed phase change cooling medium provided by the invention has the characteristics of high electrical insulation property, low viscosity, relatively low boiling point, high gasification latent heat, good compatibility and stability, incombustibility, combustion inhibition, low global warming potential (GWP), zero ozone depletion potential (ODP) and the like.