73 results about "Fluoboric acid" patented technology

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention discloses an electrolyte and a battery. The electrolyte comprises a solvent, a lithium salt and an additive, the solvent comprises acetonitrile and carboxylic ester, the additive comprises a first additive, a second additive and a third additive, the first additive is at least one of phosphate, borate, fluorophosphate and fluoborate with a film-forming potential of 1.3-2V, and the third additive is at least one of lithium salt and fluoborate with a film-forming potential of 1.3-2V. The second additive is at least one of a sulfur-containing additive, a boron-containing additive and a phosphorus-containing additive, and the third additive is a negative electrode film-forming additive; and Y is more than 0.025 and less than 60. According to the invention, a solvent system and an interface film forming mechanism of the electrolyte are synergistically regulated and controlled, so that the core problem of violent side reaction between the acetonitrile-based electrolyte and the negative electrode is solved, and meanwhile, the combination of high energy density and ultrafast charging performance is realized. The electrolyte is suitable for high-energy-density, wide-temperature-range and fast-charging type lithium iron phosphate batteries.

The invention relates to a rapid filtering device and method for potassium fluoborate production, aiming at the characteristics of slurry containing KBF4 crystal (D50 = 20-50 [mu] m), colloidal metaboric acid (HBO2) and potassium fluosilicate (K2SiF6) impurities prepared by a hydrofluoric acid-boric acid method, the device adopts a sliding block type filter frame and inflatable elastic filter cloth structure, and is matched with a rotary scraper and a hydraulic turning plate mechanism; the method comprises the following steps: controlling the temperature of reaction slurry with the solid content of 15-30wt% to 38-58 DEG C, pumping the reaction slurry into a device, breaking KBF4-K2SiF6 heterogeneous aggregates through 5-22rpm rotary stirring, triggering 0.48-0.82 MPa inflatable extrusion to peel boric acid colloid when the filtering pressure difference reaches 0.3-0.6 MPa, driving a scraper to radially feed 5-18mm crushed pressed cakes after a gas source is closed, further separating crystals and wrapping mother liquor through secondary extrusion (0.42-0.68 MPa), and finally obtaining the high-purity KBF4-K2SiF6 / KBF4-K2SiF6 / KBF4-K2SiF6 / KBF4-K2SiF6 / KBF4-K2SiF6 composite material. And finally, a filter cake with the water content of 15-25wt% is discharged by a hydraulic overturning guide plate (the inclination angle of 25-40 degrees). Compared with a traditional process, the method has the advantages that the B2O3 residual quantity is reduced to be less than or equal to 0.15 wt% (reduced by more than 50%), the filtering efficiency is improved by 2.1-3.2 times, and the method is suitable for a ten-thousand-ton potassium fluoborate production line.

The invention discloses an acidification blocking remover for an oil field and a preparation method of the acidification blocking remover. The acidification blocking remover comprises the following raw materials in parts by weight: 40-60 parts of hydrochloric acid, 10-20 parts of hydrofluoric acid, 5-10 parts of fluoboric acid, 1-3 parts of a modified stabilizer, 0.1-0.5 part of imidazoline and 20-30 parts of water. The modified stabilizer contains a quaternary ammonium salt structure which can be combined with negative charges on the clay to form a modified stabilizer coating on the surface of the clay, a polysiloxane molecular chain on the modified stabilizer can form a layer of hydrophobic film on the surface, and due to incompatibility between water molecules and hydrophobic groups, the hydrophobic film repels water groups, so that the clay can be degraded. Alkyl long chains on the outer side are combined with a hydrophobic membrane formed by polysiloxane molecules to form a second layer of hydrophobic membrane, then a bimolecular membrane is formed on the surface of the clay, the hydrophobic effect of the bimolecular membrane is far higher than that of a traditional monomolecular membrane, external moisture is effectively prevented from entering clay particles, and hydration expansion of the clay is inhibited.

The invention relates to the field of biomedicine, and particularly provides bimetal MOFs with photo-thermal and anti-oxidation effects and a preparation method and application thereof.The preparation method comprises the following steps that 1, 4, 5, 8-naphthalene tetracarboxylic dianhydride and 4-amino-4H-1, 2, 4-triazole are dispersed in DMF, a reflux reaction is conducted at the temperature of 140-160 DEG C, and a DBPT organic ligand is obtained; the preparation method comprises the following steps: fully dissolving a DBPT organic ligand, anhydrous ferric chloride, anhydrous cupric nitrate and fluoboric acid in DMF at room temperature to obtain a reaction solution, carrying out ultrasonic treatment on the reaction solution, stirring until the reaction solution is completely dissolved, putting the obtained solution into a high-pressure reaction kettle, carrying out a heating reaction, and cooling to room temperature after the reaction is finished; and centrifuging the product, cleaning and drying to obtain the Fe / Cu-MOFs. The preparation method disclosed by the invention is simple to operate, and the prepared bimetallic MOFs have good photo-thermal and oxidation resistance and can be applied to multiple treatment requirements of bacterial infection and inflammation environment regulation and control.

The invention discloses a negative electrode modification method for magnesium metal negative electrode surface morphology modification and application, and belongs to the technical field of rechargeable metal battery materials. The invention aims to solve the technical problems of nonuniform magnesium ion deposition, dendritic crystal growth and short cycle life of a magnesium metal battery in the prior art, and provides a negative electrode modification method for modifying the surface morphology of a magnesium metal negative electrode. According to the technical scheme, the negative electrode modification method for modifying the surface morphology of the magnesium metal negative electrode comprises the following steps: (1) removing an oxide layer from the magnesium metal negative electrode to obtain treated magnesium metal; (2) dissolving ammonium fluoroborate in water to obtain an ammonium fluoroborate solution; and (3) reacting the treated magnesium metal obtained in the step (1) with the ammonium fluoborate solution obtained in the step (2) to obtain the modified magnesium metal negative electrode with the modified surface appearance.

The invention discloses a surface strengthening treatment method for an inner hole of a main connecting rod of a piston type aero-engine. The surface strengthening treatment method comprises the following steps that S100, the main connecting rod is subjected to oil removal treatment; s200, performing waxing treatment on the non-plated surface on the main connecting rod to form an insulating protection layer; s300, weak corrosion activation treatment is conducted on an inner hole of the main connecting rod; s400, a tool clamp is used for installing and hanging the main connecting rod, then a lead and tin plating solution is poured into an inner hole of the main connecting rod for out-groove electroplating treatment, and the lead and tin plating solution comprises 110 g / L to 275 g / L of lead fluoroborate, 30 g / L to 65 g / L of stannous fluoroborate, 1 g / L to 2 g / L of hydroquinone and 1.5 g / L to 2.0 g / L of oxhide gelatin; and S500, the main connecting rod is detached from the tool clamp and then subjected to wax removal and cleaning treatment, and then whether the lead-tin layer is qualified or not is checked. According to the surface strengthening treatment method for the inner hole of the main connecting rod of the piston type aero-engine, the uniformity of a plating layer can be improved, the tin content in a lead-tin layer is increased, and the wear-resisting and lubricating capacity is enhanced.

The invention relates to a potassium fluoborate preparation method, which comprises: a, dissolving a certain amount of potassium salt in deionized water, stirring until complete dissolution, and adding a boron-10 complex into a hydrolysis solution according to a certain ratio to achieve complex hydrolysis; b, continuously adding a certain amount of deionized water into the solution obtained in the step a, heating to a certain temperature, and reacting for a certain time; c, cooling the solution to a certain temperature, and then filtering to obtain wet potassium fluoroborate 10; and step d, dispersing the wet potassium fluoroborate 10 into a certain amount of ultrapure water, and filtering and drying the wet potassium fluoroborate 10 to obtain the high-purity potassium fluoroborate 10. According to the invention, direct preparation of potassium fluoboron-10 is realized, the step of firstly converting potassium fluoboron-10 into boric acid in the traditional process is omitted, the process steps are optimized, the reaction time is shortened, the reaction process is reduced, and the utilization rate of boron-10 is increased.

The application relates to the technical field of grain refiners, and discloses a preparation method of an Al-Ti-B grain refiner, which comprises the following steps: S1, adding fluoroborate and fluorotitanate into aluminum liquid, carrying out alloying treatment, removing slag, and obtaining aluminum melt; during the alloying treatment, TiB2 and TiAl3 are generated, and the first mechanical vibration treatment is adopted to refine and disperse the TiB2 and TiAl3; S2, after the aluminum melt is refined and degassed, the second mechanical vibration treatment is carried out, slag is removed, and continuous casting is carried out to obtain the Al-Ti-B grain refiner; the second mechanical vibration treatment is used for forming a TiAl3-coated TiB2 structure of the TiB2 and TiAl3 refined and dispersed after the first mechanical vibration treatment. The first mechanical vibration and the second mechanical vibration are used in combination, so that the refining capacity of the Al-Ti-B grain refiner can be effectively improved.

Disclosed is a preparation method using a microreactor, of a vegetable oil polyol comprising mixing an epoxy vegetable oil, such as epoxy soybean oil, and an acid catalyst, such as fluoboric acid, int

The application belongs to the technical field of solid drying equipment, and particularly relates to a drying equipment and method for potassium fluoborate production, which comprises a drying cylinder, a heat conduction assembly and a stirring assembly, the heat conduction assembly and the stirring assembly are arranged on the inner side of the drying cylinder, the top end of the drying cylinder is provided with a feeding pipe, and the bottom end of the drying cylinder is provided with a discharging pipe. Compared with the existing vertically arranged cylindrical air duct, the heat conduction assembly greatly increases the contact area between the heat conduction assembly and the powder, and the heat conduction ring and the heat conduction disc can effectively increase the contact time between the heat conduction ring and the heat conduction disc and the powder, form a snakelike material passing channel, and make the powder reciprocally roll and slide along the radius of the heat conduction ring and the heat conduction disc during the downward flow of the powder, so that the travel path of the powder on the heat conduction assembly is optimized and prolonged, and the powder and the heat conduction assembly are fully contacted.

The invention relates to the technical field of blanket processing, in particular to a production process of a tinned copper wire, which comprises the following steps: S1, removing oil by using an alkaline degreaser sodium hydroxide of 40 g / L, sodium carbonate of 30 g / L and lauryl sodium sulfate of 5 g / L, and carrying out ultrasonic cleaning for 5 minutes at the temperature of 60 DEG C, and S2, pickling by using a dilute sulfuric acid solution of 10%, and soaking for 2 minutes at normal temperature until the surface of the copper wire is bright yellow. The quality of a plating layer is remarkably improved, a methanesulfonate system plating solution (Sn 20-40 g / L and methanesulfonic acid 80-120 mL / L) is adopted to replace a traditional fluoroborate system, the plating solution is environmentally friendly, free of toxicity and high in stability, a special brightener is added, the current density (3-8 A / dm), the temperature (25-35 DEG C) and the linear speed (10-30 m / min) are controlled, it is ensured that the plating layer is fine in crystallization and uniform in brightness, tin whiskers or pores are avoided, and the plating layer quality is improved. A silane coupling agent (KH-550) is used for passivation (the concentration is 2%), a compact silicon oxide protective film is formed, the corrosion resistance is improved, the service life of the product is prolonged, and pretreatment is efficient and accurate.

The invention relates to a wide-temperature-range dimethyl sulfite-based lithium ion high-entropy electrolyte which takes lithium difluorophosphate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluoro (oxalato) borate, lithium bis (trifluoromethylsulfonyl) imide and / or lithium bis (fluorosulfonyl) imide as solutes; the dimethyl sulfite is mixed with ethylene carbonate, ethylene sulfite, propylene carbonate, ethylene carbonate, fluoroethylene carbonate, butyronitrile and / or isobutyronitrile to form a solution. According to the invention, the adaptability of the electrolyte in a wide temperature range is further improved while the dimethyl sulfite-based lithium ion electrolyte resists 5V high voltage, the discharge capacity at-40 DEG C is optimized, and the cycle stability at 60 DEG C is considered.

The invention discloses a low-cost high-purity potassium fluoborate preparation method based on ammonium fluoride, and belongs to the field of inorganic salt chemical industry, the method comprises the following steps: S1, reacting by-product ammonium fluoride with the purity of more than or equal to 99% with boric acid to synthesize an ammonium fluoborate solution; s2, at 60-80 DEG C, precisely dropwise adding a potassium chloride solution into the ammonium fluoborate solution at a rate of 1-2 mL / (min.L), and carrying out a replacement reaction; s3, performing crystallization and purification by adopting a two-stage gradient cooling program from fast to slow; s4, a low-temperature saturated potassium fluoborate solution and absolute ethyl alcohol are sequentially adopted for targeted washing, and impurities such as chloride ions are effectively removed; and S5, performing vacuum drying to obtain a product. According to the method, the phosphorus fertilizer industrial byproduct ammonium fluoride is originally adopted to replace expensive hydrogen fluoride or fluoboric acid, so that the raw material cost is reduced by 90% or above; meanwhile, impurity inclusion is effectively inhibited, the problem of impurity introduction caused by byproduct raw materials is solved, and the electronic-grade high-purity potassium fluoborate with the main content larger than or equal to 99.95% and the chloride ion smaller than or equal to 10 ppm can be stably prepared.

The application belongs to the technical field of lithium ion batteries, and discloses a synergistic surface modification method of Li2NiO2 and NCM positive electrodes, a positive electrode tab and application thereof. Specifically, fluoroborate is added into anhydrous ethanol to obtain a mixed solution; NCM and Li2NiO2 are added, filtered, and dried to obtain a composite lithium supplement positive electrode material; the composite lithium supplement positive electrode material, carbon nanotubes and polyvinylidene fluoride are uniformly dispersed in an N-methylpyrrolidone solution to obtain a positive electrode slurry; and the positive electrode slurry is coated on the surface of an aluminum foil to obtain a positive electrode tab. The synergistic surface modification strategy is adopted to simultaneously construct a LiF-NaF-LiBO2 multifunctional composite coating on the surfaces of Li2NiO2 and NCM, thereby improving the resistance of the two to CO2 and H2O, improving the air stability, improving the ionic conductivity, improving the interface contact of the two, and thereby improving the compatibility of the two.

The present application provides a solid electrolyte containing an electrolyte solution containing a lithium salt and a carbonate-based solvent, and metal oxide particles. In the solid electrolyte, the lithium salt is at least one selected from lithium bis(fluorosulfonyl)imide and lithium fluoroborate, the carbonate-based solvent is at least one selected from dimethyl carbonate and propylene carbonate, the molar ratio of the lithium salt to the carbonate-based solvent (lithium salt / carbonate-based solvent) is 1 / 4 or more and 1 / 1 or less, the mass ratio of the electrolyte solution to the metal oxide particles (electrolyte solution / metal oxide particles) is 72 / 28 or more and 93 / 7 or less, and the specific surface area of the metal oxide particles, measured based on the BET method, is 160 m 2 / g or more and 700 m 2 / g or less.

The invention provides a low-hydrogen brittleness brush plating cadmium solution based on an inorganic acid ligand and a preparation and application method thereof, and belongs to the field of metal surface treatment. The solution comprises the following components: metal cadmium with the concentration of 0.85 mol / L to 0.95 mol / L; 1.65 mol / L to 1.85 mol / L of fluoboric acid; 1.65 mol / L to 2.00 mol / L of an organic amine; 0.1 g / L to 5 g / L of carboxylic acid; 0.1 g / L to 5 g / L of a conductive salt; and the balance of deionized water. The pH (Potential of Hydrogen) value is 7.5 to 8.8. The solution can be directly applied to field maintenance of aviation steel parts, and the problem that local damage cannot be repaired in situ through a traditional bath plating process is effectively solved; and meanwhile, the hydrogen evolution reaction and permeation of hydrogen to a matrix in the brush plating process can be remarkably inhibited, so that the repaired part can pass hydrogen embrittlement inspection of ASTM F519 without hydrogen removal treatment, and the plating binding force and corrosion resistance of the part can pass the provisions of HB 5036 Cadmium Plating Quality Inspection, so that the maintenance process is greatly simplified. In addition, the solution is simple to prepare, low in raw material cost and simple and feasible in application process.

The invention belongs to the technical field of oil exploitation, and particularly relates to a composite blocking remover and a preparation method and application thereof. The composite blocking remover comprises the following components in percentage by weight, comprising the following components in percentage by weight: 5 to 8 percent of hydrochloric acid, 1 to 3 percent of fluoboric acid, 0.5 to 2 percent of acetic acid, 0.5 to 1 percent of dodecyl trimethyl ammonium chloride, 0.1 to 0.3 percent of potassium chloride, 0.3 to 0.8 percent of sodium erythorbate, 0.2 to 0.5 percent of tetrasodium glutamate diacetate, 1 to 2 percent of ethylenediamine tetraacetic acid, 0.1 to 0.2 percent of inositol hexaphosphate, 0.1 to 0.2 percent of cocoanut fatty acid diethanolamide, 0.3 to 0.5 percent of sodium dodecyl benzene sulfonate, 0.3 to 0.5 percent of dimethyl diallyl ammonium chloride, 0.1 to 0.2 percent of ethylene glycol monobutyl ether and the balance of water. The composite blocking remover provided by the invention does not generate the problem of secondary precipitation, slows down the reaction speed of acid rocks, effectively pushes a blocking removal measure solution into the deep part of a stratum, enlarges the blocking removal radius, realizes deep treatment of the stratum, improves the acidification effect, and prolongs the effective action time of acidification.

The invention relates to the technical field of soldering flux, and particularly discloses a water-soluble normal-temperature solidification type soldering flux for an aluminum soldering tin wire and a preparation method of the soldering flux. The invention relates to a water-soluble normal-temperature solidification type soldering flux for an aluminum soldering tin wire. The soldering flux comprises the following components in parts by mass: 16-24 parts of polyethylene glycol; 16 to 24 parts of fluoboric acid; 15 to 31 parts of tri-n-octylamine; 14 to 26 parts of tetramethylethylenediamine; 8 to 12 parts of water-soluble zinc salt; 2 to 8 parts of water-soluble stannous salt; 0.4 to 1 part of a surfactant; and 0.6-2 parts of a slow release agent. The water-soluble soldering flux has the advantages that the water-soluble soldering flux which is in a solid state at normal temperature can better improve the welding strength, and the residual color after welding is relatively light.

This invention discloses a method for preparing WIC superconducting wire inlay welding of aluminum channel wires, belonging to the field of superconducting wire processing technology. The method includes: mixing deionized water and anhydrous ethanol, stirring, and heating to obtain a first mixture; slowly adding preheated polyethylene glycol PEG-400, xanthan gum, and weighed sodium benzoate sequentially to the first mixture to obtain a second mixture; slowly adding weighed stannous fluoroborate and succinic acid sequentially to the second mixture, and then cooling to room temperature to obtain a special flux for aluminum channel wire inlay welding; selecting the workpiece to be inlaid and welded; setting the welding temperature and stretching speed; and completing the inlay welding preparation using the special flux for aluminum channel wire inlay welding under argon protection. This application improves the continuous stability and forming effect of aluminum channel wire WIC superconducting wire inlay welding preparation by designing and preparing a special flux with specific components and combining it with argon protection technology.

A scale-up preparation method for 4-(dimethoxymethyl-4-piperidine)phenylboronic acid pinacol ester, relating to the technical field of pharmaceutical intermediates. The method comprises: using 4-piperidinecarboxaldehyde as a raw material to react with a sulfite and protecting an aldehyde group to obtain intermediate A; then performing a coupling reaction with potassium 4-boronic acid pinacol ester phenyltrifluoroborate to generate intermediate B; then performing deprotection on the intermediate B in the presence of an inorganic base to obtain intermediate C; and finally reacting the intermediate C in the presence of trimethyl orthoformate to obtain 4-(dimethoxymethyl-4-piperidine)phenylboronic acid pinacol ester. The method significantly reduces reaction steps, reduces raw material costs, has a simple and reliable process, is suitable for industrial production, and provides a new reaction route for product synthesis.

The invention is suitable for the technical field of metal welding materials, and provides active soldering flux coated welding powder and a preparation method thereof.The method comprises the steps that in the vacuum melting water-gas combined atomization powder making process, soldering flux is dissolved in water, the soldering flux comprises one or more composite soldering flux of boric acid, sodium fluoborate, potassium fluoborate, boric acid, boric oxide and the like, and the soldering flux is added into the water; the soldering flux of the same kind is within the protection range of the patent. In the process that metal liquid flows into the atomization cavity and high-pressure steam are combined for atomization, the metal welding powder is rapidly coated with the scaling powder, the scaling powder rapidly enters the drying channel and enters the centrifugal channel, and the alloy welding powder coated with the active scaling powder is obtained and is not limited to a silver base, a copper base, a nickel base and the like. According to the technology, the metal welding powder coated with the active agent can be obtained through direct atomization. According to a traditional method, step-by-step coating is adopted, powder is prepared firstly, then active coating is conducted, the process is complex, and the powder is prone to oxidation. The problem that the oxygen content of powder is high in the water-gas combined atomization process is further solved.

This invention provides a method for refining the surface grains of a coating, and a zinc-aluminum-magnesium coated steel sheet, belonging to the field of coating. The method includes: hot-dip galvanizing a steel substrate to obtain a coated steel sheet; cooling the coated steel sheet to a set temperature; and applying a grain refiner to at least a portion of the surface of the coating, wherein the set temperature is 390℃~420℃, and the grain refiner includes potassium fluorotitanate and a mixed salt of potassium fluorotitanate and potassium fluoroborate. By spraying a grain refiner that increases the supercooling of the coating surface, the coating surface is promoted to solidify first, thereby refining the grain structure of the coating. By controlling the temperature at which the grain refiner is sprayed onto the coating surface and the equivalent diameter of the grain refiner, the resulting coating surface has a fine eutectic structure with good atmospheric corrosion resistance and good resistance to under-film filamentary corrosion, making it less prone to under-film filamentary corrosion problems in the atmosphere.

The invention discloses a SiGe / Si selective etching solution with low Ge content and a preparation method and application thereof, and the SiGe / Si selective etching solution comprises the following raw materials by volume percent: 50-98 vol% of hydrochloric acid, 1-50 vol% of nitric acid, 0.01-5 vol% of a fluorine source, and the balance of water; the fluorine source is one or more of hydrofluoric acid, ammonium fluoride, fluosilicic acid, fluoboric acid, ammonium bifluoride and hexafluorophosphoric acid. The preparation method comprises the following steps: mixing hydrochloric acid and nitric acid to react, standing to obtain an orange red solution, then adding a fluorine source and water to obtain the etching solution, and uniformly mixing the etching solution with water before etching for use. According to the method, the etching selection ratio and the etching rate are improved, the etching rate of the SiGe material is controlled, and the method is suitable for SiGe (lt; 20%), and has a wide application prospect.

The invention provides a sodium ion battery positive electrode composite material and a preparation method thereof, and relates to the technical field of sodium ion batteries. The preparation method comprises the following steps: providing a positive electrode material, and measuring the molar weight of residual alkali in the positive electrode material; reacting the positive electrode material with fluoboric acid to obtain a reaction product; and carrying out heat treatment on the reaction product to obtain a coated final product. According to the preparation method, an accurate stoichiometric basis is provided for subsequent in-situ conversion of harmful alkaline residues into sodium fluoborate by accurately measuring the molar weight of the residual alkali on the surface of the positive electrode material. The process not only thoroughly eliminates surface impurities affecting the electrochemical performance and stability of the material, but also forms a uniform sodium fluoborate coating layer on the surfaces of material particles by heat treatment. The coating layer can effectively isolate an active substance from an electrolyte and inhibit side reactions, so that the structure stability and the cycle life of the positive electrode material are improved.

The invention discloses a preparation method of a metal catalyst for preparing polyether polyol, and relates to the technical field of metal catalyst preparation, and the preparation method comprises the following steps: adding mesoporous silica into an ethanol aqueous solution containing gamma-aminopropyltriethoxysilane, heating for reaction, washing and drying to obtain aminated mesoporous silica; adding the aminated mesoporous silicon dioxide into absolute ethyl alcohol containing octyltrimethoxysilane, heating for reaction, washing and drying to obtain modified mesoporous silicon dioxide; dissolving the modified mesoporous silica and tris (pentafluorophenyl) borane in toluene containing a deionized water catalyst, heating for reaction, washing and drying to obtain tris (pentafluorophenyl) borane modified mesoporous silica; the preparation method comprises the following steps: adding tri (pentafluorophenyl) borane modified mesoporous silica, a cobalt-zinc bimetallic precursor and 2, 5-dichloroterephthalic acid into a mixed solvent, adding a fluoboric acid catalyst, heating for reaction, washing and drying to obtain the metal catalyst.

A kind of for metal member anticorrosion of permeation aid and co-permeation agent, the permeation aid includes potassium fluoborate and ammonium chloride;Potassium fluoborate is 8-9 parts by weight, and ammonium chloride is 1-2 parts by weight;Co-permeation agent includes the permeation aid, multi-element metal powder and dispersant;Multi-element metal powder includes zinc powder, zinc-aluminum alloy powder, magnesium-aluminum alloy powder, rare earth oxide by weight parts;Multi-element metal powder includes zinc powder 60-70 parts by weight, zinc-aluminum powder 30-35 parts by weight, magnesium-aluminum powder 1-5 parts by weight, and rare earth oxide 0.5-1.0 parts by weight.The anticorrosion permeation layer formed on the surface of the component by the multi-element alloy co-permeation process using the novel permeation aid provided by the application can significantly improve the corrosion resistance of steel components.

The invention relates to the technical field of electric power fittings, in particular to an equipment wire clamp and a preparation method thereof.The equipment wire clamp comprises an aluminum substrate, one end of the aluminum substrate is in bolted connection with a plurality of glands, the other end of the aluminum substrate is provided with a welding groove, a copper plate is welded in the welding groove, and a welding layer formed by brazing paste for welding is arranged between the aluminum substrate and the copper plate; the brazing paste comprises solder alloy powder and soldering flux according to the mass ratio of (7-8): 1; the solder alloy powder comprises 7%-9% of nickel powder, 4%-6% of zinc powder, 0.5%-0.9% of nano titanium carbide and the balance tin powder. The soldering flux comprises the following raw materials of, by mass, 8%-10% of ethylene-vinyl acetate copolymer, 12%-15% of rosin, 23%-27% of activating agents, 1%-2% of surface active agents, 0.8%-1.5% of film forming agents, 4%-6% of thixotropic agents, 0.2%-0.5% of zinc fluoborate and the balance solvents. And the copper-aluminum welding strength in the copper-aluminum equipment wire clamp is improved.

The invention relates to the technical field of synthesis of pharmaceutical compounds, and particularly discloses a preparation method of 1-(4-fluoro-3-pyridyl) ethanone. According to the preparation method provided by the invention, 4-aminopyridine is taken as a starting material and reacts with fluoboric acid and sodium nitrite, fluorine is firstly applied to a pyridine ring to obtain 4-fluoropyridine hydrochloride, and then the 4-fluoropyridine hydrochloride reacts with lithium diisopropylamide and N-methoxy-N-methylacetamide to obtain 1-(4-fluoro-3-pyridyl) ethanone. According to the preparation method provided by the invention, the raw materials are cheap and easy to obtain, the operation in the preparation process is simple, and the yield is high.