285 results about "Perfluorooctanoic acid" patented technology

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 relates to a waterborne fluororesin nonstick coating, which is formed by 40 to 70 portions of modified polyte-trafluoroethylene (PTFE) water base resin, 10 to 30 portions of high temperature resistance pigment, 1 to 5 portions of fluororesin additive, 1 to 5 portions of surfactant and 20 to 40 portions of antiwear filler. The waterborne fluororesin nonstick coating uses synthesis propylene acid water base resin for modifying trafluoroethylene PTFE water base resin, adopts acrylic acid fat second polymerization method and does not use an addition agent, the entire fluorine caprylate compound which is harmful to human body in the modification process; the modified resin forms mosaic and perforating network structure, has good temperature dispersing region, solves the problem of the adhesiveness of the coating and the base material and the problems of baking and cracking, thus improving the hardness of nonstick coating. The NU aqueous fluorine resin of the invention does not stick to coating, can be coated on the surfaces of a microwave oven, an electric cooker, a nonstick pan and an electromagnetic pan, etc. to play the roles of protecting the surfaces from being stuck with food, and causing food and aluminum and other metals to be isolated.

The invention relates to a corrosive liquid for preparing monocrystal silicon textured surfaces and a method thereof. The corrosive liquid comprises an alkali solution, sodium silicate and isopropanol, and is characterized by also comprising a perfluoro octoate aqueous solution, wherein the perfluoro octoate aqueous solution has the volume percent of 0.2-1 percent and the concentration within a range of 5*10<-5>-5*10<-3>mol/L; the alkali solution has the mass percent of 1-2.5 percent, the sodium silicate has the mass percent of 0.1-2 percent, and the isopropanol has the volume percent of 0.3-2 percent; and the alkali solution is sodium hydroxide or potassium hydroxide or sodium carbonate. The corrosive liquid has low cost, pyramids formed on the prepared monocrystal silicon textured surfaces have small and uniform sizes, and the corrosive liquid is favorable for solar energy absorption and can be widely applied to the field of solar batteries.

The invention discloses a preparation method of fluorine-containing polymer. The fluorine-containing polymer is obtained through the emulsion polymerization of fluorine-containing olefins monomer in the aqueous medium of fluorine-containing surfactant under the existence of initiator, wherein the weight percentage concentration of the fluorine-containing surfactant in the aqueous medium is 0.01-1%, the weight percentage concentration of the initiator in the aqueous medium is 0.001-1%, the reaction temperature is 10-120 DEG C and the pressure is 1-6.5MPa, and the reaction time is 3-15hours. The fluorine-containing surfactant satisfies a general formula shown in the specifications, wherein a is equal to 0 or 1; b is equal to 1 or 2; c is equal to 1, 2 or 3; d is equal to 1 or 2; X is C1, F or CF3; Y is H, F or CF3; and M is carboxylate or sulphonate. According to the method, perfluoro caprylic acid and derivatives thereof are not used in the method, so the method is environment-friendly; the preparation process can be conducted under wild temperature and pressure condition without affecting the reaction ratio of the polyreaction; and polymer powder with multiple grain sizes can be obtained, and thereby fluorine-containing polymer products at various grades can be prepared.

The invention discloses a fluorine and silicon containing water and oil repellent finishing agent which is synthesized from fluorine containing acrylic ester formed by fluorine containing alkyl with a shorter carbon chain and double-bond containing organic siloxane as basic structural units. On one hand, the advantages of a fluorine containing water and oil repellent finishing agent is retained; and on the other hand, the fluorine containing acrylic ester formed by the fluorine containing alkyl with a shorter carbon chain is selected so that perfluoro caprylic acid (PFOA) and salt thereof toxic to the environment are prevented from being generated in the degradation process of the fluorine and silicon containing water and oil repellent finishing agent. By combining the advantages of the silicon and the fluorine, the fluorine and silicon containing water and oil repellent finishing agent of the invention becomes a fabric finishing agent which has excellent performance and is environmentally friendly.

The invention relates to a new mixed micelle core-shell SiO2/Fe3O4 nanometer solid phase extracting agent in the chemical analysis test instrument device field, which has the big specific surface area of the nanometer material, the strong magnetic separating property of the magnetic material, the good satiability of SiO2 shell layer and the good extraction property of the semi micelle and the absorption micelle, and is fit for the large scale batch preconditioning of bulk water sample, and has the small usage extracting agent, high efficient extraction, the simple operation, the high extracting speed, the friendly environment, the wide using range, the low cost and the reactivation property. Selecting bisphenol A(BPA), nonyl phenol(4-OP), octyl phenol (4-NP) as the represent of the hydrophobic pollution material and selecting perfluorine enanthic acid (PFHeA), perfluorooctanoic acid (PFOA), perfluorine octane sulfonic acid (PFOS), perfluorine n-nonanoic acid (PFDeA) or the like perfluorine compound as the represent of amphipathic nature pollution material, there are 0. 1g extracting agent and 50mg surface activator in 800ml environmental water simple, and the extracting ratio of the organic pollution materials is more than 90%.

To provide a fluororesin which does not substantially contain perfluorooctanoic acid or its salt, and which has a low residual amount of a fluorinated emulsifier.

A fluororesin which is obtained by emulsion-polymerizing a fluorinated monomer in an aqueous medium containing a fluorinated emulsifier of the formula (1):

XCF₂CF₂(O)_mCF₂CF₂OCF₂COOA

wherein X is a hydrogen atom or a fluorine atom, A is a hydrogen atom, an alkali metal or NH₄, and m is an integer of from 0 or 1, and coagulating the obtained aqueous emulsion, followed by drying, wherein the residual amount of the fluorinated emulsifier of the formula (1) is at most 10 ppm.

The invention belongs to the technical field of preparation of molecularly imprinting fluorescent probes and especially relates to a CdTe/CdS quantum dot-molecularly imprinting polymer (QDs-MIP) and an application of the QDs-MIP as a fluorescent probe in detection and analysis of perfluorooctanic acid. The invention aims to solve a technical problem of providing a quick, simple, sensitive and high-selective method for detecting the perfluorooctanic acid and provides a quantum dot surface perfluorooctanic acid molecularly imprinting polymer and an application thereof. The polymer is a fluorescent molecularly imprinting polymer which is prepared by embedding a molecular recognition site into the surface of a TEOS-coated CdTe/CdS quantum dot with the perfluorooctanic acid as a template molecule. The molecularly imprinting polymer is high in sensitivity, is simple in detection, is high in selectivity and affinity and can be directly applied in detection of the perfluorooctanic acid in environment. The molecularly imprinting polymer not only can reduce a detection cost but also can increase detection efficiency.

The invention discloses a water-based non-stick polyether sulphone coating composition containing no perfluorooctanoic acid. The composition comprises (1) 8 to 25 weight percent of polyether sulphone, (2) 2 to 15 weight percent of fluorocarbon polymer containing no perfluorooctanoic acid, (3) 40 to 90 weight percent of water-based dispersant and (4) 0 to 20 weight percent of toner for coloring. The coating composition adopts distilled water as a thinner in spraying, reduces the use amount of an organic solvent, meets the requirement of environmental protection, contains no perfluorooctanoic acid (PFOA), and achieves the requirement of harmlessness to a human body.

The invention discloses a preparation method of porous nanometer crystal Ti/SnO2-Sn/Ce-PbO2 electrodes and a method for using the porous nanometer crystal Ti/SnO2-Sn/Ce-PbO2 electrodes for degrading and mineralizing perfluoro caprylic acid in water, and belongs to the technical field of electrochemistry. Waste water containing perfluoro caprylic acid is subjected to electrolytic oxidation treatment by using the porous nanometer crystal Ti/SnO2-Sn/Ce-PbO2 electrodes as anodes and Ti or 304 stainless steel as cathodes. The method is characterized in that the perfluoro caprylic acid can be efficiently mineralized under the mild condition. An electrochemical oxidation method is adopted, the technical flow process is simple, the operation is convenient, the reaction condition is mild, the treatment effect is good, in addition, stability and reliability are realized, and the industrial application is easy to realize. The adopted porous nanometer crystal Ti/SnO2-Sn/Ce-PbO2 electrodes have the advantages that the oxidation capacity is high, the service life is long, the processing is easy, the cost is low, and the like.

The invention discloses a method for preparing floating modified polytetrafluror-ethylene (PTFE) by adding a secondary comonomer which is perfluro propyl vinyl ether. Activator used in the method can be persulfate of alkali metals or alkaline-earth metals and a redox initiation system. The reaction temperature changes within a range of 5 DEG C -90 DEG C and the pressure is between 0.5-2.0MPa based on different activating system. The perfluro propyl vinyl ether is added by a vacuum absorption way, so as to avoid using perfluro octoate.

The invention belongs to the chemical wastewater treatment field, in particular relates to a method for treating wastewater with low-concentration ammonium perfluorooctanoate through all-film method which combines the ultra microfiltration technology and the nanofiltration technology. The method comprises the following steps: firstly adopting microfiltration or ultrafiltration to remove insoluble particles in the wastewater with low-concentration ammonium perfluorooctanoate; and secondly using a nanofiltration system to concentrate ammonium perfluorooctanoate in the pretreated and clarified wastewater, wherein the nanofiltration system is divided to three levels, each level adopts the concentrated water inner circulation mode to concentrate ammonium perfluorooctanoate to a higher concentration step by step, the permeate of each level of nanofiltration can be directly charged or used as the process water of other processes, and the zero emission of industrial wastewater can be realized. The method of the invention has simple operation, low energy consumption and no secondary pollution; and high-value-added perfluorooctanoic acid can be recycled and the industrial wastewater can meet the direct emission standard or the reuse standard.

The invention discloses a modified silane surface pretreating agent containing polyoxyethylene octadecanol ether. The modified silane surface pretreating agent is prepared from the following raw material components in parts by weight: 100 parts of deionized water, 10-15 parts of modified coupling agent, 10-15 parts of ethanol, 30-40 parts of silane coupling agent 702, 20-30 parts of silane coupling agent KH-550, 1-2 parts of dicumyl peroxide, 0.002-0.003 part of sodium perfluorooctanoate, 0.3-0.5 part of tree ash, 4-6 parts of polyacrylic emulsion, 0.8-1.2 parts of polyoxyethylene octadecanol ether, 0.05-0.1 part of lanthanum triacetate and 0.2-0.3 part of phytic acid. The final product is obtained through modifying by using the coupling agent, compounding, adding additives, distributing, mixing and reacting. The modified silane surface pretreating agent provided by the invention has the characteristics of no toxicity, environment friendliness, convenience in use, compact and uniform silane membrane, strong adhesion and high corrosion resistance property.

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 discloses sludge-based activated carbon with an effect of efficiently adsorbing PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid) and a preparation method as well as application of the sludge-based activated carbon. The sludge-based activated carbon is prepared by drying, activation, high temperature carbonization treatment, acid leaching, washing and stoving. In waste water containing the PFOS and the PFOA, the sludge-based activated carbon is used as an adsorber. After a small quantity of the activated carbon is added, adsorption removal rates of the PFOS and the PFOA with low concentration reach up to 99.9 percent and 71.0 percent. By using the method to prepare the sludge-based activated carbon, the operation is simple, the cost is low, the adsorption removal effects on the PFOS and the PFOA are good, recycling of sludge waste is realized, and meanwhile reference is provided for solving the pollution problem of perfluorinated compounds.

The invention discloses a technology for preparing a zinc super-hydrophobic surface. The preparation method comprises the following steps: chemically etching a zinc sheet by virtue of hydrochloric acid to form a spherical rough structure on the surface of the zinc sheet; then, performing hydrothermal reaction to form a layer of uniform rod-shaped structure which is close to nanoscale on the surface of the spherical rough structure, wherein the rod-shaped structure is almost vertical to the surface of the zinc sheet; and finally, carrying out low-energy modification by using an absolute ethyl alcohol solution of perfluoro caprylic acid to obtain the super-hydrophobic surface with good lipophobicity. According to the preparation method, distilled water drops onto the chemically-modified zinc sheet surface to carry out contact angle measurement, wherein a contact angle of the zinc sheet surface and water is greater than 150 degrees, and a rolling angle is smaller than 10 degrees; and moreover, the surface has relatively good lipophobicity, and has a contact angle of 145.62 degrees with peanut oil.

The invention belongs to the field of fluorine-containing polymer preparation, and provides a fluorine-containing emulsifying agent for replacing perfluorocaprylic acid and salt thereof. A2O3SCF2 (CF2OCF (CF3))n-1COOA, CF3CF2 (CF2OCF (CF3))n-1COOA, H3COOCF2 (CF2OCF (CF3))n-1COOA, in the formula, n is 1 to 4, and A is hydrogen atom, alkali metal or NH4. The invention also provides a method for preparing fluorine-containing polymer without containing perfluorocaprylic acid by using the fluorine-containing emulsifying agent. The fluorine-containing emulsifying agent of the invention has better emulsifying and dispersing effects, and the quality of an obtained product is in accordance with that of a reaction product in presence of PFOA.

The invention discloses a method for nano-scale gallium oxide vacuum-ultraviolet photocatalytic degradation of perfluorooctanic acid. The method comprises preparation of a nano-scale beta-Ga2O3 photocatalyst and photocatalytic degradation of perfluorooctanic acid based on the nano-scale beta-Ga2O3 photocatalyst. Through use of an ethylenediamine solution as an additive, the gallium salt forms bunchy nano-scale beta-Ga2O3 and has a specific surface area of 30-50 m<2>/g 3-5 times that of the commercial gallium oxide. The larger specific surface area means that more catalytic active sites are exposed so that the catalytic material has better catalytic activity. The method uses vacuum ultraviolet light as a light source, which has higher chemical energy with photogenerated electrons generatedby the catalytic material, and gallium oxide is used as a semiconductor material in the deep ultraviolet region and has a stronger absorption capacity for vacuum ultraviolet light, so that perfluorooctanoic acid can be degraded efficiently.

The invention relates to a preparation method of a liquid carbon dioxide thickening agent for unconventional oil and gas reservoir development, and can solve the problem of damage to an oil and gas reservoir in a conventional mining mode. The preparation method has the technical scheme that methylbenzene and water are added into a bottle; then, serinol is added; terbutyloxycarbonyl anhydride is dropwise added at 0 DEG C; reaction is performed for 4h at 25 DEG C; distillation is performed to obtain an intermediate product (1); then, perfluoro caprylic acid is added into another bottle; thionyl chloride and N,N-dimethyl formamide are added at 75 DEG C; reaction is performed for 2h; distillation is performed to obtain an intermediate product (2); next, the intermediate product (1) is added into another bottle; the temperature is raised to 75 DEG C; the intermediate product (2) is dropwise added; reaction is performed for 12h at 75 DEG C to obtain an intermediate product (3); finally, dichloromethane and trifluoroacetic acid are added into the bottle; then, the intermediate product (3) is added; reaction is performed for 2h at 25 DEG C; after extraction and vacuum drying, hexamethylene diisocyanate is added to perform reaction for 2 minutes; a final product is obtained. The thickening agent can increase the carbon dioxide viscosity, and can be used for fracturing reformation.

The invention provides a method for quantitatively detecting perfluorooctanoic acid and salts thereof in fluororubber. The method comprises steps of dissolving, depositing, solid phase extracting and deriving a sample, and then carrying out gas phase chromatography-mass spectrography measurement on the derivative. Counted as S/N=10, the limit of quantitative detection in the method of the invention is 0.04mg/kg, and related coefficient is 0.9991. The method in the invention has the characteristics of fast sample processing, high extraction efficiency, simple derivation step, small impurity interference and high sensitivity.

The invention discloses a preparation method and applications of a super hydrophobic oleophobic material with pH responsiveness. The preparation method comprises following steps: kaolin is added intoan ethanol solution of perfluorocapylic acid, after uniform mixing, an ethanol solution of silane is added, an obtained mixture is heated to 50 to 60 DEG C with stirring, thermal insulation is carriedout for 2 to 4h so as to obtain a suspending solution, the suspending solution is used for coating the surface of a substrate, and drying is carried out so as to obtain the super hydrophobic oleophobic material with pH responsiveness. The super hydrophobic oleophobic material possesses excellent super hydrophobicity and lipophobicity, and excellent wear resistance and corrosion resistance; in-suit or ex-situ pH induced material surface wetability change can be caused; a plurality of conversions between the hydrophobicity and lipophobicity can be realized. The super hydrophobic oleophobic material can be used for effective separation of a plurality of types of oil water mixtures, and especially treatment of oil-in-water emulsion, and the application prospect in treatment of leaked crude oil and purification of oil-containing waste water is promising.

The invention discloses a preparing method of a super-amphiphobic surface with scale preventing performance, relates to a preparing technology of the super-amphiphobic surface, and belongs to the field of metal material surface modification. The preparing method is a method for preparing a super-amphiphobic copper-zinc alloy layer on the surface of rolled steel. According to the preparing method, rolled steel serves as a substrate, firstly, a copper-zinc alloy layer is electrically deposited on the surface of the rolled steel, then a sample with the surface covered with the copper-zinc alloy layer is immersed in a beaker containing a mixed solution of potassium hydroxide and ammonium persulfate, and the beaker is placed in a water bath at a certain temperature to be insulated for corresponding time; and then at the room temperature, the treated steel sample is immersed in a perfluoro caprylic acid absolute ethyl alcohol solution with a certain concentration for several hours, and then the treated steel sample is taken out to be aired at the room temperature so that the super-amphiphobic surface can be obtained. The contact angle between the super-amphiphobic surface obtained through the method and water and the contact angle between the super-amphiphobic surface obtained through the method and glycerin both exceed 150 degrees, and the rolling angle between the super-amphiphobic surface obtained through the method and water and the rolling angle between the super-amphiphobic surface obtained through the method and glycerin are both smaller than 5 degrees. The scaling appearance of the super-amphiphobic sample in a mixed solution composed of CaCl2 and NaHCO3 is in a needle shape and is similar to an aragonite structure, and the super-amphiphobic sample has good scale preventing performance compared with a rhomb calcite structure on the surface of a steel base body.

The invention discloses a preparation method for a special fluoroether oligomer which is obtained by carrying out a photochemical polymerization reaction on a special fluorine-containing monomer mixture. The obtained fluoroether oligomer has many previously unimagined valuable applications. The fluoroether oligomer with the average molecular weight of 300-1500, the viscosity of about 1-20 cPs at 25 DEG C and the acidic value of about 70-100 is suitable for being used as a fluoroether surfactant and further can be used as a perfluoro caprylic acid substituent. The fluoroether oligomer with the average molecular weight over 1500 and the viscosity of about 20-500 cPs at 25 DEG C is further suitable for important applications of being processed as fluoroether oil and high-temperature-resistant lubricating oil and the like. The products or mixture thereof can be further used as an auxiliary for a polymerization process of special fluororubber, particularly low-temperature fluororubber. The low-temperature resistance can reach (-40) DEG C, so that the special fluoroether oligomer can be further accepted in markets of space flight and aviation and automobile industry.

The invention provides an oil-water separation material with pH responsiveness and a multi-stage structure and a preparation method of the oil-water separation material. The method comprises the following steps of taking aminobenzene as a monomer, perfluorooctanoic acid as a dopant and ammonium persulfate as an oxidizing agent, taking a polyester screen mesh, porous sponge, cotton fabric, cotton and the like respectively as base materials, synthesizing a polyaniline composite material with a micro/nano multi-stage structure by adopting an in-situ chemical oxidation polymerization method, wherein the oil-water separation material has a large quantity of micro stagger polyaniline fiber on an overall woven mesh structure. Polyaniline and sponge are mutually compounded to form a novel materialwith super-hydrophobic/super-oleophilic performance. The polyaniline composite material synthesized in one step by adopting an aminobenzene in-situ chemical oxidation polymerization method is used for oil-water separation, the synthetic process is simple, and the raw materials are easy to obtain; the oil-water separation material has universality and can be applied to multiple kinds of base material surfaces; the material can be used for carrying out oil-water separation of an oil/water/oil three-phase system through adjusting and controlling a pH value, different organic solvents in water are absorbed, and can be discharged in an basic solvent without needing to draw support from external force.