85 results about "Perfluorocaprylic acid" patented technology

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 method for preparing an aluminum-base super-amphiphobic surface. The method comprises the following steps: polishing aluminum plates, cleaning to remove oil, parallelizing the cleaned aluminum plates as an anode and a cathode, connecting the aluminum plates with a direct current power supply through wires, connecting the aluminum plate to the positive pole of the power supply, connecting the cathode to the negative pole, and putting the aluminum plates in an electrolyte to carry out electrochemical etching; and after the electrochemical processing is finished, soaking the aluminum plate in boiling water for some time, taking out, drying, soaking the aluminum plate in a perfluorocaprylic acid water solution to carry out modification, taking out, and drying to obtain the aluminum-base super-amphiphobic surface. The surface obtained by the method has the characteristics of no water staining and no oil staining, and can be used for resisting staining and corrosion on the aluminum surface.

The invention relates to the technical field of super-hydrophobic materials, in particular to super-hydrophobic aluminium and a preparation method thereof. The preparation method comprises the following steps of: taking aluminium as a base material; soaking an aluminum sheet into hydrochloric acid solution so as to carry out chemical reaction; boiling through boiled water; forming a micro-nano composite structure with micron-sized bulges, holes and a nano-scale scaly shape on the surface of the aluminium; and modifying through perfluoro caprylic acid to obtain the surface of the aluminium sheet with a super-hydrophobic performance.

The invention relates to a method for preparing a fluorine-containing polymer by using a mixed fluorine-containing surfactant. The method comprises the following steps of: performing homopolymerization or copolymerization by using a fluorine-containing olefin monomer or performing copolymerization on the fluorine-containing olefin monomer and the fluorine-fee olefin monomer under the effect of an initiator; adding 0.01-1% of mixed fluorine-containing surfactant to the reaction system, wherein the fluorine-containing surfactant is combined by a molecular weight fluorine-containing surfactant [Rf-(O)m-Rf'-COO]nAn+ and high molecular fluorine-containing surfactant [CF2=CF-(O)p-Rf1-(O)q-Rf2-COO]nAn+ containing unsaturated bonds. Without perfluoro caprylic acid as a dispersant, the method is high in safety and easy to control polymerization conditions, so that the environmental pollution by perfluoro caprylic acid is avoided, and the product system is good in stability and uniform in grain shape.

The present invention is fluoric elastomer with fluorine content higher than 70 %. The fluoric elastomer consists of the following copolymerized units: 1, 1-difluoro ethylene 30-60 wt%, perfluoro propylene 20-40 wt% and tetrafluoro ethylene 20-40 wt%. The present invention also relates to the preparation process of the fluoric elastomer with high fluorine content, and the preparation process is one emulsion polymerization process with water as medium, low molecular weight esters as chain transferring agent, persulfate as initiator, perfluoro caprylate as dispersant and borax as pH regulator.

The invention discloses an application of lactobacillus rhamnosus CCFM1060 in preparation of functional microbial agents, foods and / or medicines. The lactobacillus rhamnosus CCFM1060 can tolerate thegastrointestinal environment of the human body, significantly improve fasting blood glucose rise and abnormal oral glucose tolerance of type 2 diabetics caused by high fat diet and STZ injection, reduce the area under the curve during glucose tolerance drug administration, and relieve insulin resistance; remarkably improve the increase of total cholesterol content and the increase of low-density lipoprotein cholesterol in serum of type 2 diabetics caused by high-fat diet and STZ injection; obviously relieve the inflammatory state of the liver; and significantly reduce pancreatic and liver pathological injuries caused by high-fat diet and STZ injection. The lactobacillus rhamnosus CCFM1060 has relatively strong adsorption capacity on perfluorooctanoic acid (PFOA), and has the capacity of relieving the toxicity of the PFOA.

The invention discloses a preparation method of a fluoro-ether carboxylic acid surfactant. A fluorine-containing olefin monomer, oxygen and a molecular weight regulator are initiated to carry out the photochemical reaction by ultraviolet light to generate fluoro-ether acyl chloride and fluoro-ether acyl fluoride at the temperature of -40 to -80 DEG C, fluoro-ether acyl chloride and fluoro-ether acyl fluoride are hydrolyzed under the radiation of ultraviolet light to generate fluoro-ether carboxylic acid, and the fluoro-ether carboxylic acid is washed and purified to obtain a fluoro-ether carboxylic acid finished product. Through the adoption of the preparation method, the completely nontoxic fluoro-ether carboxylic acid surfactant can be produced, and can serve as a dispersing agent to completely replace perfluoro caprylic acid during the fluorine-containing polymer production process.

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 discloses a preparation method of a beta-cyclodextrin modified loofah sponge adsorbent. The preparation method comprises the steps that 1, a loofah sponge is organically treated; 2, the organic loofah sponge is modified through gamma-(2,3-glycidyl) propyl group trimethoxy silane; 3, by mass, 52-65% of dimethyl sulfoxide, 8-15% of beta-cyclodextrin and 8-15% of hexamethylene diisocyanate are added in a reactor, the temperature is increased to 55+ / -2 DEGC and kept constant, stirring is carried out, a backflow reaction is carried out for 2-4 h, then 15-25% of the organic loofah sponge modified through the gamma-(2,3-glycidyl) propyl group trimethoxy silane is added, the sum of the percentages of all the components is 100%, the constant temperature is kept to be 65+ / -2 DEG C, stirring is carried out, the backflow reaction is carried out for 6-8 h, acetone backflow washing is carried out after the reaction is finished, the mixture is taken out to be placed in a vacuum drying box to be dried, and the beta-cyclodextrin modified loofah sponge adsorbent is obtained. The beta-cyclodextrin modified loofah sponge adsorbent has the high adsorption capacity for perfluoro caprylic acid, and is low in cost and environmentally friendly.

The invention discloses application of bifidobacterium adolescentis CCFM1061 in preparation of functional microbial agents, foods and / or medicines. The bifidobacterium adolescentis CCFM1061 can be rapidly colonized in the intestinal tracts, can remarkably improve fasting blood glucose and oral glucose tolerance of type 2 diabetes induced by STZ and high-fat diet and decrease the area under a curvewhen glucose tolerance is reduced, can remarkably alleviate the increase of total cholesterol and the decrease of high-density lipoprotein cholesterol in serum of the type 2 diabetes caused by STZ and high-fat diet, can remarkably alleviate the insulin resistance of the type 2 diabetes, can remarkably improve the level of inflammation in liver tissues of the type 2 diabetes, and can remarkably alleviate the pathological damage of the pancreas, liver and other tissues of the type 2 diabetes. In addition, the bifidobacterium adolescentis CCFM1061 has strong adsorption capacity on perfluorooctanoic acid (PFOA), and has the capacity of relieving PFOA toxicity.

The invention discloses a preparation method of melamine-modified porous magnetic dextran microspheres. The preparation method is characterized by comprising the following steps: by taking salad oil as an organic phase and dextran as an aqueous phase, spraying the aqueous phase into the organic phase at room temperature, stirring for carrying out a reaction for 1h, heating up to 80+ / -2 DEG C, continuously reacting for 3-4h, cooling to the room temperature, carrying out solid-liquid separation, rapidly freezing, and carrying out freeze drying for 24h to obtain porous magnetic dextran microspheres; after that, adding 60-68% of methanol, 5-10% of epoxy chloropropane and 8-14% of melamine into a reactor according to composition mass percent concentration, dissolving, and then adding 14-22% of the porous magnetic dextran microspheres, wherein the percentage sum of all the components is 100%; maintaining the constant temperature of 50+ / -2 DEG C, stirring, and carrying out a reflux reaction for 2-3h; cooling, then washing a product respectively with deionized water and methanol, carrying out solid-liquid separation, and drying to obtain the melamine-modified porous magnetic dextran microspheres. The adsorbent has very high adsorption capacity for perfluoro caprylic acid, and can be repeatedly used for a plurality of times, thus being low in cost and environment-friendly; furthermore, the melamine-modified porous magnetic dextran microspheres have magnetism, thus being easy to separate.

The invention discloses a material with a specific surface structure for preparing a non-sticky pan. The lower surface of the material is planar, the upper surface of the material is concave-convex and is formed by the regular arraying of micron-sized hemispheres in an HCP (hexagonal close packed) manner, and nano-sized hemispheres are respectively distributed on the surface of each micron-sized hemisphere. By adopting the specific surface structure, the material can realize the non-sticky effect, thereby fundamentally avoiding damage and pollution to human beings and the environment by a harmful component namely PFOA (perfluorocaprylic acid) in Teflon used at present for producing the non-sticky pan.

Perfluoro caprylic acid is generally used in the production process of fluoropolymers produced through an emulsion polymerization method, the fluoropolymers are dried after a polymerization reaction is completed, and as the perfluoro caprylic acid is absorbed by the fluoropolymers, a large number of tail gas containing perfluoro caprylic acid steam is produced in the drying process. The tail gas containing the perfluoro caprylic acid steam is absorbed with absorption liquid in an absorption tower, perfluoro capylic acid salt in the absorption liquid after absorbing the perfluoro caprylic acid is concentrated through adopting a nanofilteration membrane or a reverse osmosis membrane, the absorption liquid penetrating through the membrane returns to the absorption process to be repeatedly used, perfluoro caprylic acid salt concentrated solution obtained through concentration by the membrane is subjected to subsequent acidizing and rectifying, the perfluoro caprylic acid is recovered, and the concentrated solution can be used in other processes directly. Through the process, the perfluoro caprylic acid in the tail gas in an oven can be completely absorbed, the tail gas meets the discharge standard, other wastewater and waste gas are not produced while the perfluoro caprylic acid in the tail gas is recovered, and the process is easily amplified, and suitable for industrial production.

The invention discloses an adsorption resin for removing perfluorinated pollutants in a water body as well as preparation and application of the adsorption resin, and aims to solve the problems of poor removal effect on perfluorooctanoic acid in water, no regeneration and the like of the traditional adsorption material, such as an activated carbon material. According to the method, styrene and divinylbenzene are used as framework materials; a proper pore-foaming agent and a proper dispersing agent are selected to prepare macroporous resin with moderate pore diameter; p-xylylene dichloride (XDC) is used as a post-crosslinking agent; alkylation reaction is carried out under low steric hindrance; a rigid benzene ring structure is introduced into the resin through post-crosslinking; the hydrophobicity of the resin is further improved, the crosslinking degree is improved, the micropore structure is adjusted, the adsorption resin with narrow particle size distribution, uniform pore size andhigh specific surface area is obtained, the micropore size in the resin is close to the molecular size of perfluorooctanoate in water, the adsorbate screening capacity is high, and the adsorption rateof perfluorinated compounds can be further increased.

The invention relates to the waterproof processing and finishing technology, in particular to a waterproof antibacterial fabric finishing agent and an application thereof. The waterproof antibacterialfabric finishing agent is composed of the following components by weight parts of: 30 to 45 parts of acrylate copolymer, 5 to 10 parts of silica solution, 1 to 8 parts of long-acting antibacterial agent, 1 to 5 parts of dispersant, and 40 to 60 parts of water. In the invention, through adopting the compounded antibacterial agent components, the dispersion and stability of the long-acting antibacterial agent are improved, and at the same time, the long-acting antibacterial effect of the waterproof antibacterial fabric finishing agent is significantly improved. In addition, the waterproof antibacterial fabric finishing agent disclosed by the invention does not contain PFOS(perfluorooctane sulfonate) and PFOA(perfluorooctanoic acid), which is easily biodegraded, has no bioaccumulative properties, is less harmful to the human body, and is a relatively safe and environmentally friendly product.

The invention belongs to the field of coatings, and discloses a water-based non-stick coating. The water-based non-stick coating comprises a primer and a finishing coat. The primer comprises the following components in parts by weight: 15 to 35 parts of a polytetrafluoroethylene emulsion, 1 to 15 parts of a catalyst, 0.1 to 15 parts of a pigment, 0.1 to 15 parts of a filler, 0 to 15 parts of water, 5 to 30 parts of a water-based polyethersulfone resin emulsion, 5 to 30 parts of modified polyamide-imide resin and 5 to 20 parts of a thickening agent. The finishing coat comprises the following components in parts by weight: 50 to 70 parts of a polytetrafluoroethylene emulsion, 5 to 15 parts of a modified acrylic emulsion, 1 to 25 parts of a thickening agent, 0 to 7 parts of a pigment, 5 to 20parts of water and 0.5 to 2 parts of a catalyst. The water-based non-stick coating disclosed by the invention does not use an auxiliary agent, namely a perfluorooctanoate compound which is harmful toa human body, meets the requirements of environmental protection, can endure salt for 50 hours in salt spray tests and has hardness of 4-5 H.

The invention discloses a porous material adsorbent and a preparation method and application thereof. The preparation method comprises the steps of dissolving 1,3,5-benzenetricarboxylic acid and zirconium oxychloride octahydrate in a mixed solvent of formic acid and N,N-dimethylformamide (DMF), conducting heating to obtain white precipitate, and conducting washing to obtain a porous material; and dissolving the porous material into an ethylene diamine tetraacetic acid (EDTA) disodium solution, and conducting heating, filtering and washing to obtain the EDTA modified MOF-808 with the carboxyl functional group. The MOF-808-EDTA porous adsorbent disclosed by the invention can be used for efficiently removing perfluoroalkyl substances in water, wherein the perfluoroalkyl substances mainly comprise perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS). Meanwhile, heavy metal ion pollutants, mainly heavy metal ions such as Hg<2+>, As<2+>, Cd<2+> and Pb<2+>, in water can be efficiently removed, so that the water quality of drinking water meets the set standard and requirement of domestic drinking water.

A stretchable coated fabric to which water repellency has been imparted using a fluorochemical water repellent (C6 fluorochemical water repellent) comprising a copolymer containing a C6 or lower perfluoroalkyl group. As a result of this configuration, no C8 fluorochemical water repellent containing perfluorooctanoic acid, perfluorooctanesulfonic acid, or the like is used and, hence, the coated fabric exerts no influence on the environment. The fluorochemical water repellent has a toluene repellency of 100 seconds or higher, the synthetic-resin solution to be applied to at least one surface of a stretchable cloth has a thixotropic index measured at 23ºC of 1.4-2.0, and the synthetic resin has a 100% modulus of 5 kgf / cm2 or higher. Consequently, the stretchable coated fabric is free from, for example, synthetic-resin leakage to the back, and a coating resin film is formed with excellent film formation properties.

The invention discloses a composite material for improving the reaction activity of Fe(III)-tetra-amido macrocyclic ligand (Fe(III)-TAML) and a preparation method and application method thereof, belongs to the field of synthesis of environment functional materials, and solves the issue of significantly reduced reaction activity of the Fe(III)-TAML under neutral or near neutral conditions. A micro Composite material Fe(III)-TAML / DODMA / PFOA, with the Fe(III)-TAML as a base, is synthesized by a self-assembly method assisted by a surface active agent dioctadecyl dimethyl ammonium chloride (DODMA), wherein a dichloromethane / water mixed solvent is used as a medium and perfluorooctanoic acid (PFOA) is used as a dopant. Compared with the free Fe(III)-TAML of the prior art, the reaction activity of the composite material Fe(III)-TAML / DODMA / PFOA synthesized by the self-assembly method assisted by the surface active agent is significantly improved.

The invention discloses a photodynamic therapy agent for relieving tumor hypoxia as well as a preparation method and application thereof, and belongs to the technical field of medicines. The photodynamic therapy agent is a metal-organic framework nano composite material loaded with O2. The metal-organic framework nano composite material is metal-organic framework nano particles Zr-TCPP (Fe), the interiors of nano frameworks of the nano particles Zr-TCPP (Fe) are modified with perfluorooctanoic acid, and meanwhile glucose oxidase GOx is further adsorbed in pore channels of the nano particles Zr-TCPP (Fe). According to the invention, a drug delivery system capable of catalyzing tumor to endogenously generate O2 is designed while O2 is delivered to tumor tissue, so that the hypoxic environment can be remarkably improved, and the photodynamic therapy effect is enhanced. In addition, the synthetic steps of the therapy agent are relatively simple, and the yield is relatively high; and a synthetic method is simple and relatively low in cost, so that the method is suitable for large-scale production.

The invention discloses a Parkinson's disease specific serum endogenous small molecule marker and application thereof. The marker contains 2-amino-3-(4-hydroxyl-3-methoxyphenyl) propionic acid, ferulic acid and citraconic acid, altrose, pentadecanoic acid, o-phosphoserine, 4, 6 beta-hydroxymorphine, L-thyroxine, 5[epsilon], 9[epsilon], 16[epsilon]-17-hydroxy peraluminum-19-acid, 8-(1,2,dyhydroxy-3-methylbutyl-3-ene-1-yl)-7-methoxy-2H-chromine-2-2-ketone,10-hydroxydecanoic acid, perfluoro caprylic acid, and Corchorifatty acid F. The Parkinson's disease specific serum endogenous small molecule marker provided by the invention has the characteristics of high accuracy and high sensitivity. The prediction offline prediction area AUC of some markers reaches 0.95 or above, the accuracy and sensitivity of the markers are high, and the markers can be directly used for Parkinson's disease indexes.

The invention discloses a preparation method of a hexamethylenetetramine-modified glass fiber adsorbent, and is characterized in that: firstly, pretreating a glass fiber by adopting an octylphenol polyoxyethylene ether solution to obtain a pretreated glass fiber; then modifying the glass fiber with chloropropyl-triethoxysilane to obtain a chloropropyl-triethoxysilane-modified glass fiber; then adding the following components into a reactor by weight percentage: 74-78% of deionized water and 8-12% of hexamethylene tetraamine, stirring for dissolving, adding 12-16% of the chloropropyl-triethoxysilane to modify the glass fiber, wherein the sum of the weight percentages of each component is 100%; stirring and allowing a reaction for 6h at room temperature, performing solid-liquid separation after reaction ending, washing with the deionized water, and drying to obtain the hexamethylenetetramine-modified glass fiber adsorbent. The adsorbent has selective adsorption to perfluorooctanoic acid,and is good in mechanical properties, good in chemical stability, high in adsorption speed, easy to elute, and endowed with regeneration capability.

The invention discloses an intelligent oil-water separation material as well as a preparation method and application thereof. The intelligent oil-water separation material is an intelligent oil-water separation material S-BiOBr@MS which is prepared by the steps of in-situ growing BiOBr crystals on melamine sponge MS in a stirring manner, further modifying perfluorooctanoic acid and taking 3-aminopropyltrimethoxysilane as an adhesive. The preparation method is simple, complex equipment and excessive energy consumption are not needed, and the synthesized material has super-hydrophobicity-super-lipophilicity, pH responsiveness and excellent mechanical stability, and is high in adsorption capacity for various oils and organic solvents and high in oil-water separation efficiency. The material subjected to alkali treatment can be converted into super-hydrophilicity-underwater super-lipophobicity, and can carry out efficient photocatalytic degradation on various water-soluble pollutants.

The invention discloses a preparation method of a super-hydrophobic coating with excellent self-repairing and anti-corrosion properties. The preparation method comprises the following steps: uniformlydispersing SiO2 and TiO2 in a mixed solution of absolute ethyl alcohol and ammonia water, ultrasonically stirring, quickly adding tetraethyl silicate and heptadecafluorotriethoxysilane of perfluorooctanoic acid into the solution, reacting, adding a coupling agent into the system, stirring to obtain a solution with super-hydrophobic property, spraying the prepared super-hydrophobic solution on a substrate and curing to obtain a super-hydrophobic coating with excellent performances, wherein in the step 1, SiO2 and TiO2 dispersed in absolute ethyl alcohol and ammonia water are nano particles inspecification. According to the preparation method of the super-hydrophobic coating with excellent self-repairing and anti-corrosion properties, the coating has excellent anti-corrosion performance, the metal corrosion rate can be obviously reduced, the coating has excellent mechanical properties such as friction resistance, rapid self-repairing of the coating is achieved, the super-hydrophobic performance is achieved, the cost is low, and the production process is simple.

The invention discloses an antibacterial transparent heat-insulation nanometer glass paint .The antibacterial transparent heat-insulation nanometer glass paint is prepared from, by weight, 20-21 parts of nanometer tin antimony oxide, 0.2-0.3 part of a dispersing agent SN-5040, 79-81 parts of waterborne polyurethane resin, 30-35 parts of deionized water, 0.6-0.8 part of sodium fluorosilicate, 40-50 parts of N,N'-dimethylformamide, 20-22 parts of a 20% sulfuric acid solution, 20-22 parts of perfluorocaprylic acid, 3-4 parts of methyl methacrylate, 0.1-0.2 part of potassium persulfate, 3-3.5 parts of isocyanate, 1.2-1.3 parts of chitin whiskers and 0.2-0.3 part of hydrogenated castor oil .According to the antibacterial transparent heat-insulation nanometer glass paint, chitin whiskers, hydrogenated castor oil and sodium fluorosilicate are used for blending modification, the water resistance and lipophilicity of chitin whiskers are improved, and the caking property of chitin whiskers and resin is improved so that the strength and adhesive force of a coating can be better increased, and the antibacterial performance of the paint can be improved .

The invention discloses a metal organic framework material with a one-dimensional woven structure as well as a preparation method and application thereof; silver salt, benzoic acid compounds and pyridine compounds are used as raw materials and synthesized by adopting a hydrothermal method to obtain the functionalized metal organic framework material with the one-dimensional woven structure; the benzoic acid compounds are selected from 1, 2, 3-trimellitic acid, 2-aminoisophthalic acid and 5-hydroxyisophthalic acid, and the pyridine compound is 4, 4 '-bipyridine. The prepared metal organic framework material is of a rod-like structure, the diameters of the metal organic framework material are different due to different ligands, the rod-like materials are overlapped to form the one-dimensional woven structure, and adsorption of perfluorooctanoic acid in a sample is better facilitated.

The invention discloses a method for treating wastewater containing low-concentration perfluorooctanoic acid. The method comprises the following steps that the wastewater containing low-concentration perfluorooctanoic acid passes through activated carbon adsorption equipment; the wastewater reaching the standard after passing through the activated carbon adsorption equipment can be directly discharged or subjected to next-step treatment, and the activated carbon saturated by adsorption is transferred to activated carbon regeneration equipment and regenerated by using an ethanol and sodium chloride medicament combination; the regenerated activated carbon is transferred to the activated carbon adsorption equipment for continuous adsorption; the regeneration waste liquid is firstly pumped into evaporation equipment from a waste liquid collecting tank through a lifting pump, so as to recycle the ethanol through evaporation and realize reuse of the ethanol, and the residual mother liquid is discharged into a mother liquid collecting device; and after evaporation, the mother liquor is pumped into an electrolytic oxidation device from the mother liquor collecting device through a water pump, and the electrolytic oxidation device is mainly used for oxidizing perfluorooctanoic acid in the mother liquor. The method can realize up-to-standard discharge of the perfluorooctanoic acid-containing wastewater and innocent treatment of the regenerated waste liquid.

The invention relates to a preparation method of perfluorooctanoic acid (Perfluorooctanoic acid, PFOA) artificial complete antigen, which belongs to the technical field of organic chemistry and immunology. The carboxylic acid group of perfluorooctanoic acid is used to link perfluorooctanoic acid to a carrier protein directly or through a connecting arm of an appropriate length to prepare a complete antigen of perfluorooctanoic acid. The carrier protein can be bovine serum albumin (BSA), ovalbumin (OVA), hemocyanin (KLH) or human serum albumin (HSA). Determination of the amount of PFOA on the carrier protein by MALDI-TOF-MS mass spectrometry. The method is simple to operate, does not require special instruments and equipment, and has low cost, which provides a basis for screening its specific antibody and establishing an immunoassay method in the future.

The invention discloses a nano-magnesia doped polyethylene direct-current cable composite with good compactness. The composite is prepared from the following raw materials in parts by weight: 1-1.3 parts of benzoin, 0.6-0.8 parts of cobalt aluminate, 2.3-2.6 parts of triphenyl phosphate, 5-5.5 parts of montmorillonite, 15-18 parts of water, 10-11 parts of nano-magnesia, 90-91 parts of polyethylene, 30-35 parts of N, N-dimethyl formamide, 200-220 parts of a sulfuric acid solution with the concentration being 20wt%-22wt%, 100-120 parts of perfluorocaprylic acid, 23-27 parts of nano-polytetrafluoroethylene micro powder, 70-75 parts of chloroform, 2.4-2.5 parts of methyl methacrylate, 0.1-0.2 parts of potassium persulfate and 1.5-1.6 parts of nonionic borate. According to the composite, benzoin, cobalt aluminate and triphenyl phosphate are used for modifying montmorillonite, therefore, pores of the composite can be reduced, and the strength and the electrical performance are improved.