280 results about "Platanic acid" patented technology

The invention relates to a preparation method of Pt monatomic nano-enzyme and application of Pt monatomic nano-enzyme in cardiac troponin I. The preparation method comprises the following steps: 1) ultrasonically dispersing cobalt salt, selenium powder, chloroplatinic acid, urea and sodium chloride in an alcohol solvent, heating and stirring until the solvent is completely volatilized to obtain a solid mixture, and grinding the solid mixture into powder; and 2) placing the powder in a heating device, carrying out Joule heat treatment in an air atmosphere, washing a reactant, and carrying out vacuum drying to obtain the Pt monatomic nano-enzyme. Se doping is introduced in the one-step chemical reaction process to construct oxygen vacancies, rapid heating and structural shaping are achieved in combination with Joule heat treatment, the Se-doped Co3O4-loaded Pt monatomic catalyst is obtained, the oxygen vacancies and Se doping sites are synergistically used as anchoring sites, Pt monatomic atoms are effectively fixed, and the loading capacity and dispersity of the Pt monatomic atoms are improved. The obtained material shows excellent POD-like enzyme activity, can be used for constructing a high-sensitivity colorimetric immunoassay system, and realizes rapid and accurate detection of cTnI.

The invention relates to the technical field of high polymer material chemistry, and discloses a high and low temperature resistant anti-yellowing optical adhesive and a preparation process thereof, the high and low temperature resistant anti-yellowing optical adhesive comprises the following components by weight: 40-60% of modified organic silicon resin, 20-30% of urethane acrylate, 10-15% of alicyclic epoxy resin, 0.5-5% of a nano inorganic filler, 0.8-2.5% of an anti-yellowing composite reagent, and the balance of a solvent. The coating is prepared from the following components in percentage by weight: 0.5 to 1.5 percent of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.1 to 0.3 percent of fluorine modified polyacrylate flatting agent and 0.3 to 1.0 percent of chloroplatinic acid-divinyl tetramethyl disiloxane complex catalyst. The preparation method comprises the following steps: mixing alpha, omega-dihydroxy polydimethylsiloxane and phenyltrimethoxysilane according to a mass ratio of 8: 2-7: 3, adding 0.3-1.0% of a chloroplatinic acid-divinyl tetramethyl disiloxane complex catalyst, and raising the temperature by stages under the protection of nitrogen, so that the glass transition temperature of the adhesive can reach 120 DEG C below zero and 125 DEG C, and the temperature of the adhesive can reach 120 DEG C below zero and 125 DEG C below zero. And the long-term service requirement of the optical device in an extreme temperature environment is met.

The invention discloses unsaturated polyester resin for an unmanned aerial vehicle fuselage and a preparation method of the unsaturated polyester resin, and relates to the field of high polymer materials. When the unsaturated polyester resin for the unmanned aerial vehicle fuselage is prepared, a flame-retardant monomer reacts with 2-hydroxy-5-(hydroxymethyl) benzaldehyde to prepare a modified flame-retardant monomer; reacting cellulose with acrylic acid to obtain pre-modified cellulose; the pre-modified cellulose, 1-allyl-1, 1, 3, 3-tetramethyldisiloxane and chloroplatinic acid are subjected to a reaction, and modified cellulose is prepared; maleic anhydride, 5-(1H-imidazole-1-yl)-1, 3-phthalic acid, propylene glycol and the modified flame-retardant monomer are subjected to a reaction, and pre-polyester is prepared; and stirring the pre-polyester, zinc chloride, modified cellulose, benzophenone peroxide and styrene to obtain the anti-aging coating. The prepared unsaturated polyester resin for the unmanned aerial vehicle fuselage has good anti-aging, self-repairing, flame-retardant and self-cleaning performance.

The invention relates to an improved photoelectric coupler packaging electroplating technology which comprises the following steps that S10, self-repairing microcapsules are dispersed into electroplating liquid, the microcapsules comprise wall materials and core materials, and the core materials comprise vinyl siloxane and chloroplatinic acid catalysts; s20, sequentially forming a nano gradient composite coating structure on the surface of the substrate, wherein the composite coating structure comprises a substrate layer, a transition layer, a main functional layer and a packaging layer; and S30, carrying out micro-area deposition by adopting a light-induced selective electroplating process, wherein the micro-area deposition comprises laser micro-area activation, pulse electroplating deposition and in-situ ultraviolet curing. According to the electroplating process, through the nanometer gradient composite coating structure, the interface stress concentration is reduced through layer-by-layer transition of the material and the thickness, the thermal cycle resistance of the coating is improved, and meanwhile the balance among conductivity, mechanical strength and thermal stability is achieved.

The invention discloses a fuel cell cathode catalyst and a preparation method thereof, and belongs to the technical field of fuel cells. The preparation method of the fuel cell cathode catalyst comprises the following steps: adding a modified multi-walled carbon nanotube into a chloroplatinic acid aqueous solution with the mass concentration of 5g / L, carrying out ultrasonic treatment at 30-50 DEG C for 1-2 hours, and then carrying out freeze drying; and putting the dry powder into a horizontal tube furnace, introducing inert gas as protective gas, heating to 450-500 DEG C, preserving heat for 1 hour, cooling to room temperature along with the furnace, and taking out to obtain the fuel cell cathode catalyst. The modified multi-walled carbon nanotube is MWCNT / PEI / 5-formyl-2-thiopheneboronic acid, and the 5-formyl-2-thiopheneboronic acid is grafted after the PEI is grafted on the surface of the MWCNT, so that the dispersity of the MWCNT can be obviously improved, the agglomeration phenomenon of the MWCNT is reduced, the dispersion is more uniform, the loading capacity of platinum is high, the electrocatalytic activity of the catalyst is obviously enhanced, and the dosage of platinum is reduced.

The invention discloses a method for preparing a carbon monoxide normal-temperature oxidation catalyst by using electrolytic manganese residues and oil sludge, which comprises the following steps: uniformly mixing the oil sludge and the electrolytic manganese residues to obtain manganese oil sludge, uniformly stirring the manganese oil sludge and mixed halophilic desulfurizing bacteria, fermenting, and drying to constant weight to obtain fermented manganese oil sludge, the method comprises the following steps: carbonizing dry fermented manganese oil sludge to obtain a manganese carbide oil material, uniformly mixing the manganese carbide oil material with a blueberry extract to obtain a manganese carbide oil extract mixture, uniformly mixing and stirring the obtained manganese carbide oil extract mixture with a chloroplatinic acid solution, standing, filtering, washing, and drying to obtain the mixed halophilic desulfurizing bacteria. Drying to constant weight to obtain a platinum-doped carbonization extraction precursor, and finally roasting the platinum-doped carbonization extraction precursor to obtain the carbon monoxide oxidation catalyst. The composite catalyst with high specific surface area and multiple active sites is formed, and resource utilization of waste is achieved.

The invention relates to the technical field of catalyst preparation, and provides a nitrogen-containing molecule modified MXene loaded Pt monatomic catalyst, a preparation method and application, the preparation method comprises the following steps: S1, preparing an NH2 / CC electrode; s2, dipping the NH2 / CC electrode in a mixed solution of an MXene suspension and chloroplatinic acid hexahydrate at room temperature for reaction, and then irradiating and drying with a mercury lamp to obtain an NH2-MX / Pt-CC electrode; and S3, carrying out secondary amino modification to obtain the catalyst containing nitrogen molecule modified MXene to load Pt single atoms. According to the preparation method of the catalyst with the nitrogen-containing molecule modified MXene loaded with the Pt single atoms, the atom utilization rate of the material is effectively increased, reaction active sites are increased, meanwhile, the interaction between the two-dimensional material and the Pt atoms is enhanced, and the stability of the catalyst under the industrial and current density is improved.

The invention discloses a method for determining the content of hydrogen ions in a chloroplatinic acid solution, and belongs to the technical field of analytical testing. In order to solve the problems that the chloroplatinic acid solution is yellow after being diluted and the manual titration end point is difficult to judge, a potentiometric titration method is adopted, and the end point is determined by measuring electrode potential mutation without depending on indicator color change. The method comprises the steps of test condition preparation, burette calibration, standard solution preparation and calibration, sample treatment and titration, result calculation and the like, a full-automatic potentiometric titrator is selected, the titration volume is controlled within the range of 10-15 mL, and a sodium hydroxide standard solution is used for sample titration after calibration. The relative standard deviation of the determination result is less than 0.5%, the adding standard recovery rate is between 96.3% and 103.1%, and the method has the characteristics of high analysis speed, high accuracy and good stability, is suitable for accurate detection of hydrogen ions in chloroplatinic acid production and quality inspection, and effectively solves the defects of the traditional method.

The invention relates to a platinum-zinc alloy supported nitrogen-doped porous multi-layer carbon material and preparation and application thereof, the carbon material takes a rod-like graded porous carbon nanomaterial as a carrier, and platinum-zinc alloy particles and zinc monatomic are jointly supported on the surface of the carrier; the preparation method comprises the following steps: S1, adding zinc acetate and hexadecyl trimethyl ammonium bromide into DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding into a polyacrylonitrile solution, and stirring; s2, performing electrostatic spinning on the obtained spinning precursor solution; s3, adding the obtained nanofiber into a zinc acetate dihydrate solution, then adding a dimethylimidazole solution, carrying out hydrothermal reaction, soaking the obtained product in a chloroplatinic acid methanol solution, and then carrying out freeze drying; and S4, heating carbonization is carried out under the protection of an inert atmosphere, then annealing and cooling are carried out, and the PtZn-Zn-N4-HPCNFs material is obtained. Compared with the prior art, the catalytic performance and the like in the reaction processes of oxygen reduction reaction (ORR), chlorine evolution reaction (CER) and the like can be effectively improved.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a high-dispersion platinum group noble metal-based catalyst, which comprises the following steps: preparing a porous rod-like cobaltosic oxide carrier material, cleaning with deionized water, drying, and roasting for 4-8 hours; dissolving chloroplatinic acid or platinum chloride in deionized water to form a noble metal solution; soaking the treated cobaltosic oxide carrier in a noble metal solution, taking out the carrier from the solution after soaking is completed, filtering, cleaning, drying, and roasting for 4-6 hours in an inert gas atmosphere; and keeping the temperature and reducing for 2-4 hours in a hydrogen atmosphere. When the porous rodlike cobaltosic oxide carrier material is prepared, firstly, a cobalt chloride solution is poured into the lower part of the double-layer cavity for stirring, a urea solution drips into the cavity through a spray head in the stirring process, a stirring barrel is turned over after stirring is completed, the stirred solution flows out and is filtered, the cobalt chloride solution and the urea solution are continuously added into the double-layer cavity for stirring and mixing, and the porous rodlike cobaltosic oxide carrier material is prepared. Therefore, the porous rod-like cobalt oxide solvent material is efficiently prepared.

The invention belongs to the technical field of rhenium alloy materials, and particularly relates to a high-strength rhenium alloy material and a preparation method thereof. The rhenium alloy material is prepared from the following raw materials in percentage by mass: 12 to 24 weight percent of molybdenum, 6 to 9 weight percent of niobium, 2 to 5 weight percent of cobalt, 1 to 3 weight percent of tungsten, 0.5 to 1.2 weight percent of modified tantalum carbide, 3 to 6 weight percent of high-entropy rare earth and the balance of rhenium and other inevitable impurities. The modified tantalum carbide is prepared by the following preparation process: adding tantalum chloride, zirconium oxychloride and phenolic resin into a mixed solution of acetylacetone and n-butyl alcohol, stirring for 1-2 hours under a heating condition, dropwise adding ammonia water, continuously stirring for 0.5-1 hour, and drying to obtain a precursor; calcining the precursor, and cooling to obtain the modified tantalum carbide. The rhenium alloy prepared through the method has high hardness, good bending strength and excellent high-temperature mechanical property.

The invention belongs to the technical field of fiber felts, and particularly relates to a preparation method of a bamboo / wood / PP fiber felt for automotive interiors and a composite material of the bamboo / wood / PP fiber felt.The bamboo / wood / PP fiber felt is formed by opening, scattering, fully mixing and carding mixed fibers composed of wood fibers and modified bamboo fibers and PP fibers to form a fiber net, and then the fiber net is needled to form a dense felt material; wherein the modified bamboo fiber is prepared by the following steps: mixing 3, 5-di-tert-butyl-4-hydroxybenzaldehyde, methyl undecyl ketone, a sodium hydroxide solution and ethanol for reaction to obtain a hindered phenol material; mixing and reacting the hindered phenol material, chloroplatinic acid and tetrahydrofuran to obtain a long-chain alkyl hindered phenol grafted material; bamboo fibers, an ethanol solution and the long-chain alkyl hindered phenol grafting material are mixed and react, and modified bamboo fibers are obtained; the ultraviolet light stability of the bamboo / wood / PP fiber felt for the automotive trim is improved, and the tensile property of the bamboo / wood / PP fiber felt for the automotive trim can be greatly enhanced.

The present invention discloses a preparation method and application of a PtCu-TCP composite photocatalyst, which belongs to the field of photocatalysts. Hexahydrated chloroplatinic acid, trihydrated copper nitrate and a tris-olefin porous polymer (TCP) ethylene glycol dispersion are added to a two-necked flask and heated to 170-180°C for 4 hours. After the reaction is completed, the black precipitate is collected by centrifugation, washed and dried to obtain a PtCu-TCP composite photocatalyst. The preparation process of the composite photocatalyst is simple and the conditions are easy to control. According to structural characterization and performance characterization experiments, it can be found that the prepared PtCu-TCP composite photocatalyst has the advantages of stable chemical properties and high catalytic efficiency, and has high catalytic activity and stability in seawater; and because it has the advantages of easy availability of raw materials and low preparation cost, it has certain research and application value.

The invention provides a carbon-supported platinum-cobalt-copper multifunctional alloy catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. Wherein the nanocarbon carrier solution is mixed with a chloroplatinic acid solution, a cobalt chloride solution and a copper chloride solution, a sodium hydroxide aqueous solution is added to adjust the pH value, ultrasonic dispersion and stirring are performed to obtain turbid liquid, and the molar ratio of platinum ions to cobalt ions to copper ions is 2: (0.5-1): (0.5-1); then, putting the turbid liquid into a reaction kettle, and reacting at 120-250 DEG C for 1-6 hours to obtain a black colloidal solution; then filtering, washing and drying the black colloidal solution to obtain black powder; and finally, carrying out acid treatment on the black powder, and grinding to obtain the carbon-loaded platinum-cobalt-copper multifunctional alloy catalyst. The catalyst is used for catalyzing an oxygen reduction reaction of a cathode in a hydrogen fuel cell and / or a methanol fuel cell, and / or catalyzing a methanol oxidation reaction of an anode in a direct methanol fuel cell.

A preparation method of a platinum-boron aluminum catalyst for dehydrogenation of methylcyclohexane comprises the following steps: step 1, taking aluminum nitrate nonahydrate, adding CTAB (cetyltrimethyl ammonium bromide), and pouring absolute ethyl alcohol into a beaker A; adding boric acid and deionized water into a beaker B, and pouring the solution in the beaker B into the beaker A; slowly dropwise adding ammonia water into the beaker A, then adding absolute ethyl alcohol, and aging; evaporating the solution in the beaker A, drying in a drying oven, and finally putting in a muffle furnace; preparing a B-O-Al carrier with a large specific surface area; step 2, putting the B-O-Al carrier with the large specific surface area and absolute ethyl alcohol into a beaker, then adding a chloroplatinic acid solution, then putting the beaker into ultrasonic waves for oscillation, and then putting the beaker into a drying oven for drying to obtain a Pt / B-O-Al (unreduced) catalyst; and putting the Pt / B-O-Al (unreduced) catalyst into a tubular furnace, and reducing the Pt / B-O-Al (unreduced) catalyst under the condition of H2 to finally obtain the Pt / B-O-Al catalyst. The catalyst has the characteristics that the low-temperature requirement is low, the sintering inactivation resistance is high, and high-efficiency, long-life and stable dehydrogenation can be realized under the low Pt loading capacity (1wt%).

The invention relates to the technical field of glucose detection, in particular to a high-sensitivity glucose detection material and a preparation method thereof. The preparation raw materials of the high-sensitivity glucose detection material comprise the following components in parts by weight: 1-2 parts of modified glucose oxidase, 6-10 parts of modified porous microspheres, 1-1.5 parts of chloroplatinic acid and 0.6-1 part of palladium acetate. The prepared detection material is high in detection sensitivity and good in repeatability and stability.

The invention discloses a carbon-doped carbon nitride nanotube as well as a preparation method and application thereof in photocatalytic reaction, and belongs to the technical field of inorganic photocatalytic nano materials. Comprising the following steps: roasting urea, melamine and 2, 4, 6-triaminopyridine under protective gas; adding the carbon-doped carbon nitride nanotube, 5-hydroxymethylfurfural and chloroplatinic acid hexahydrate into the deionized water; photocatalytic hydrogen evolution is started to cooperate with selective oxidation reaction of 5-hydroxymethylfurfural. The carbon-doped carbon nitride prepared by the preparation method disclosed by the invention is in a nanotube shape; and the catalyst can be effectively applied to solar photocatalytic hydrogen evolution to cooperate with selective oxidation of 5-hydroxymethylfurfural to generate 2, 5-diformyl furan. The invention mainly solves the problems that the value-added reaction cooperated with the hydrogen production process cannot be realized and the overall economic value cannot be improved in the traditional hydrogen production means. The method is an effective, practical and simple method, is suitable for laboratory preparation and industrial production, and has huge development space and application prospect.

The invention discloses a fluorine release film for a high-viscosity silica gel protective film of an AF glass screen and a preparation method of the fluorine release film, and belongs to the technical field of unsaturated polyester, raw materials are uniformly mixed and coated on a PET base material, during high-temperature heat preservation, part of double bonds on a modified release agent and a modified filler can react with silicon-hydrogen bonds on hydrogen-containing silicone oil under the action of chloroplatinic acid, so that the fluorine release film is formed. The modified filler and the modified release agent are grafted by residual double bonds on the modified filler and the modified release agent under the action of 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide through ultraviolet irradiation, so that the modified filler is more thoroughly contacted with polymer molecules, a stable conductive grid can be formed during raw material curing, and the conductivity of the conductive grid is improved. Meanwhile, under the action of triphenyl sulfonium hexafluorophosphate, an expanding monomer DB-TOSU is subjected to double-ring-opening polymerization to form bicyclic acetal, the bicyclic acetal is converted into carbonyl and hydroxyl, and the carbonyl and hydroxyl are matched with a polyhedral oligomeric silsesquioxane structure on the modified filler, so that the smoothness of the surface of the release film is ensured.

The invention relates to the technical field of adhesive preparation and application, in particular to a high-voltage-resistant damp-heat-resistant organosilicon sealant for a new energy power system. The organic silicon sealant is prepared from a component A, a component B and a platinum-ionic liquid catalyst, the component A is prepared from the following components: modified boron-nitrogen heterocyclic polysiloxane, a fluorine-containing siloxane composite filler, 3-epoxypropoxy propyl triethoxy silane and 2, 5-dimethyl hexynediol; the component B is prepared from the following components: hydrogen-terminated silicone oil, perfluorononyl polydimethylsiloxane, nano zinc oxide and gamma-methacryloxy propyl trimethoxy silane; and the platinum-ionic liquid catalyst is prepared from chloroplatinic acid and 1-butyl-3-methylimidazolium hexafluorophosphate. The high-pressure-resistant damp-heat-resistant organic silicon sealant provided by the invention has better heat-conducting property and high-pressure resistance, after 1200h damp-heat aging treatment, the retention rates of the heat conductivity and the volume resistivity are both greater than 91%, and the sealant has good extreme damp-heat weather resistance.

The invention discloses a method for preparing a fuel cell platinum-carbon catalyst, and relates to the technical field of fuel cells, and the method comprises the following steps: (1) mixing: fully mixing an alkali solution, a chloroplatinic acid solution and carbon carrier slurry according to a mass ratio, and uniformly dispersing to obtain platinum-carbon precursor slurry; (2) reaction: transferring the platinum-carbon precursor slurry into a reaction device, and carrying out first-step reaction; (3) secondary reaction: heating the cooled solution to 110-130 DEG C, carrying out secondary reaction for 10-30 minutes, ending the reaction, stopping heating, and cooling the reaction solution to 50-70 DEG C; and (4) adjusting the pH of the system. (5) cleaning and filtering: cleaning and filtering for 5-10 times by using ultrapure water to obtain a wet catalyst; and (6) drying: transferring the wet platinum-carbon catalyst into a vacuum drying box at 70-90 DEG C, and carrying out vacuum drying for 8-12 hours.

The invention discloses a PtRu nanocage and a preparation method and application thereof, and the method comprises the following steps: (1) adsorbing ruthenium chloride and chloroplatinic acid to ZIF-8 to form a PtRu ZIF-8 composite material; (2) performing high-temperature calcination on the PtRu-ZIF-8 composite material in a hydrogen-argon reducing atmosphere to reduce the PtRu-ZIF-8 composite material into metal Ru and Pt, and forming an intermetallic compound by Zn generated by decomposition of ZIF-8, Ru and Pt to obtain a PtRuZn composite material; and (3) selectively etching the PtRuZn composite material by using a hydrochloric acid solution to remove Zn so as to obtain the PtRu nanocage with the cage-shaped structure. The method is easy and convenient to operate, the catalytic activity can be remarkably improved, and the Pt dosage can be greatly reduced. The material is suitable for AEMWE, and a new solution is provided for developing a low-cost and high-stability water electrolysis hydrogen production technology.

The invention relates to a microwave technology-based PtFe / NF nanosheet rapid preparation method, which is characterized in that chloroplatinic acid, ferric nitrate and foamed nickel are used as raw materials, an ethanol-water mixed solution is used as a solvent, and efficient synthesis of a PtFe / NF nanosheet is realized through a microwave reactor. The preparation technology has the remarkable advantages of being easy and convenient to operate, environmentally friendly, high in reaction rate and the like, the prepared PtFe / NF nanosheet shows good application prospects in the field of electrolytic hydrogen production of alkaline fresh water and alkaline seawater, and an innovative solution is expected to be provided for a hydrogen energy preparation technology.

The invention discloses a preparation method of cluster platinum powder, which comprises the following steps: firstly, weighing a dispersing agent, dissolving the dispersing agent in deionized water in a reaction kettle to serve as a reaction base solution, preparing a chloroplatinic acid solution, adding a proper amount of a stabilizer to serve as an oxidant solution, and preparing a corresponding amount of a reducing agent solution; dropwise adding an oxidant and a reducing agent solution into the reaction kettle according to a set flow rate for dropwise adding reaction; after the reaction is finished, solid and liquid phases are centrifugally separated, and a cluster platinum powder product is obtained after drying and crushing. The cluster platinum powder with different activities can be prepared by adjusting the pH value of the oxidizing agent, the stabilizing agent and the reaction temperature.

The invention discloses imprinted resin, a preparation method thereof and application of the imprinted resin in platinum recovery. The preparation method of the imprinted resin comprises the following steps: S1, carrying out nucleophilic substitution reaction on chloromethyl polystyrene resin and N-(2-mercaptoethyl) acrylamide in a solvent, and collecting the resin after the reaction is finished; s2, adding a chloroplatinic acid solution into the resin obtained in the step S1, and carrying out a coordination reaction; s3, adding a cross-linking agent and an initiator into the system obtained in the step S2, carrying out polymerization reaction, and collecting resin after the reaction is finished; and S4, adding an eluent into the resin obtained in the step S3, and desorbing chloroplatinic acid radical ions to obtain the imprinted resin. The imprinted resin provided by the invention has high selectivity, high adsorption capacity and good regeneration performance on chloroplatinic acid radical ions, and is suitable for efficient recovery and resource utilization of platinum.

The invention discloses a wear-resistant EVA material and a preparation method thereof, and relates to the technical field of high polymer materials. When the wear-resistant EVA material is prepared, nano cellulose and a triazole type ultraviolet absorbent react to prepare modified nano cellulose; the preparation method comprises the following steps: sequentially reacting silicon dioxide with 4-anilinoethyltriethoxysilane and 4-vinylaniline to prepare modified silicon dioxide; reacting the ethylene-vinyl acetate copolymer with allyl dichlorophosphine and eugenol in sequence to prepare a modified ethylene-vinyl acetate copolymer; melting and mixing the modified ethylene-vinyl acetate copolymer, the modified nanocellulose, the modified silicon dioxide, hydrogen-containing silicone oil and chloroplatinic acid, and performing compression molding to obtain the wear-resistant EVA material. The wear-resistant EVA material prepared by the invention has excellent wear resistance, flame retardance and aging resistance.

The invention discloses a fluoride-free oil-proof agent for paper pulp molding and a preparation method thereof, and belongs to the technical field of paper pulp molding materials. The fluoride-free oil-proof agent is prepared from the following raw materials in parts by weight: 40 to 60 parts of long-chain alkane, 10 to 20 parts of short-chain alkane, 10 to 15 parts of film-forming agent, 5 to 10 parts of modified polysilazane, 3 to 7 parts of nano material, 1 to 3 parts of chitosan derivative, 0.1 to 3 parts of cross-linking agent, 6 to 10 parts of filler and 60 to 100 parts of solvent. Wherein the modified polysilazane is prepared by reacting polysilazane with methyltriethoxysilane and 3-halogenated propylene under the action of a catalyst and chloroplatinic acid isopropanol. The preparation method comprises the following steps: mixing long-chain alkane, short-chain alkane and a solvent, and heating to react; other components are mixed and subjected to ultrasonic treatment; and mixing the two mixtures under ultrasonic and pressure conditions. The fluoride-free oil-proof agent provided by the invention is environment-friendly and safe, has excellent oil-proof performance, and is suitable for surface treatment of paper pulp molded products.

The invention discloses an electrochemical preparation method and application of a superfine platinum particle modified nickel-iron double hydroxide nanosheet array, and belongs to the technical field of water electrolysis. The preparation method comprises the following steps: in a three-electrode system, taking a mixed solution of nickel salt and ferrous salt as an electrolyte, and carrying out electro-deposition by adopting a constant potential deposition method to obtain a carbon cloth material for in-situ growth of a ferro-nickel hydroxide nanosheet array; and then in a two-electrode system, a mixed solution of chloroplatinic acid and potassium hydroxide is used as an electrolyte, and electro-deposition is performed by adopting a constant current deposition method, so that uniform loading of superfine platinum particles on the surface of the ferro-nickel double hydroxide nanosheet array is realized. The superfine platinum particle modified nickel-iron double hydroxide nanosheet array prepared by the preparation method disclosed by the invention can show excellent catalytic activity and stability in hydrogen production by alkaline electrolysis of water.

The invention discloses a Karstedt catalyst and a preparation method thereof, and belongs to the technical field of catalysts. The preparation method provided by the invention comprises the following steps: firstly, chloroplatinic acid reacts with three different siloxanes to generate a zero-valent platinum complex, the siloxanes are tetradimethyl vinyl siloxy silane, tetramethyl divinyl disiloxane and 1, 3-dimethyl-1, 1, 3, 3-tetraethylene disiloxane, calcium oxide is added in the reaction to be matched with sodium bicarbonate to neutralize, and then the zero-valent platinum complex is obtained. And after the reaction, reducing residual bivalent platinum by using sodium borohydride, and finally loading by using an SBA15 molecular sieve as a carrier to obtain the finished product Karstedt catalyst. The multi-ligand Karstedt catalyst is formed by combining a tetradentate ligand, a conventional chain ligand and a branched chain polyvinyl ligand, the multi-ligand Karstedt catalyst has high catalytic activity and stability, the loading capacity and the loading binding force are improved through a network architecture of a complex configuration, the dosage of the supported catalyst is reduced, and the cyclic utilization rate is improved.

The preparation method mainly comprises the following steps: dissolving chloroplatinic acid, lanthanum salt and manganese salt in water according to a certain proportion, adding a complexing agent, adjusting the pH value, and carrying out gelation, drying and high-temperature calcination to obtain a perovskite precursor; and treating in a reducing atmosphere, so that platinum atoms are selectively dissolved out from crystal lattices, high-dispersion platinum nanoparticles are formed on the surface, and finally, the composite catalyst with extremely low platinum loading capacity is obtained. According to the method, platinum species are stably anchored through the perovskite carrier, the platinum atom utilization rate and catalytic stability are remarkably improved, excellent electrocatalytic activity and durability are shown in the oxygen reduction reaction, and the method can be widely applied to energy conversion equipment such as zinc-air cells and fuel cells and has important practical application value.

The invention discloses a preparation method of a titanium anode for disinfecting a swimming pool. The preparation method comprises the following steps: carrying out surface pretreatment on a titanium substrate; preparing a coating solution A, a coating solution B, a coating solution C and a coating solution D, wherein the coating solution A is a chloroplatinic acid n-butyl alcohol solution with the concentration of 0.05-0.1 mol / L; the coating liquid B is an n-butyl alcohol mixed solution containing chloroplatinic acid and tantalum pentachloride, and the total metal ion concentration of the coating liquid B is 0.05-0.1 mol / L; the coating liquid C is an n-butyl alcohol mixed solution containing chloroplatinic acid and ruthenium trichloride, and the total metal ion concentration of the coating liquid C is 0.6-0.8 mol / L; the coating liquid D is a butanol solution containing ruthenium trichloride, and the total metal ion concentration of the coating liquid D is 0.3-0.5 mol / L; and the surface of the titanium substrate is sequentially coated with the coating liquid of all the coatings, drying and sintering treatment are conducted after coating of each coating, and a compact bottom layer, a middle buffer layer, a transition layer and a surface active layer are sequentially formed. According to the preparation method of the titanium anode for disinfecting the swimming pool, an optimized micro-crack structure which is controlled in crack number, small in size and uniform in distribution is constructed, so that the service life of the anode is remarkably prolonged while the efficient disinfecting capacity is guaranteed. The invention also provides the titanium anode prepared by the method.