94 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 integrated reaction process for preparing potassium fluoborate through efficient conversion of fluosilicic acid, and relates to the technical field of inorganic fluorine chemical industry, and the potassium fluoborate is prepared through the technologies of complexing metal impurities through EDTA disodium, catalyzing condensation reaction through Fe-TiO2, carrying out K2CO3 / nano gamma-Al2O3 composite desilicication, deeply removing sodium through ion exchange and carrying out mother liquor closed-loop circulation. The problems of serious sodium pollution, low reaction efficiency and resource waste in the traditional process are solved. The composite desiliconization agent improves the desiliconization rate to 96%, the reaction time is shortened by 40% through nanometer catalysis, the mother liquor recycling rate is 80%, and the silicon slag is converted into high-added-value nanometer white carbon black. The product purity is greater than or equal to 99.5%, the sodium residue is less than or equal to 0.003%, and the method is suitable for industrial production of electronic-grade potassium fluoborate.

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 provides an anode coating electrolyte and application thereof in an aluminum alloy metallographic test method. The anode coating electrolyte comprises hydrofluoric acid, hydrochloric acid, nitric acid, fluoboric acid and distilled water; wherein the volume ratio of distilled water to hydrofluoric acid to hydrochloric acid to nitric acid to fluoboric acid is 200: (1-3): (2-5): (4-6): (8-12); the aluminum alloy metallographic testing method comprises the following steps: (1) carrying out coarse grinding, polishing and fine grinding on an aluminum alloy sample to obtain a pretreated aluminum alloy sample; (2) a lead plate serves as a cathode, the pretreated aluminum alloy sample is immersed in the anode film coating electrolyte and connected with an anode of a direct-current anode film coating machine, and film coating is completed under the constant film coating current; and (3) carrying out metallographic testing on the coated aluminum alloy sample by using a metallographic microscope. According to the method, the combination of the acidic corrosive liquid conforming to grain observation and the fluoboric acid is selected, so that the time consumption and the treatment voltage for treating the sample are reduced, and the aluminum alloy sample subjected to anode film coating is clear and complete in grain boundary, high in repeatability and obvious in contrast.

In order to solve the problem of recovery of a byproduct boric acid in the phenylboronic acid production process, boric acid solids are converted into a fluoboric acid solution, a potassium fluoborate product is prepared through desilicication purification, potassium fluoborate precipitation and impurity removal, and various indexes of potassium fluoborate meet the quality requirements of industrial first-grade products GB / T 22667-2008. According to the technical scheme, boron resources can be effectively recycled, and environmental pollution is reduced; the product raw material cost in the potassium fluoborate industry is reduced; the economic benefit and the environmental benefit are remarkable.

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 relates to the technical field of lubricants, and discloses a high-performance low-temperature lubricant and a preparation method thereof.The high-performance low-temperature lubricant is prepared from, by weight, 75-85 parts of base oil, 8-12 parts of a composite surfactant, 4-7 parts of an extreme pressure lubricant, 1-3 parts of an antioxidant and 0.5-2.5 parts of a fluoborate wear-resistant pour point depressant; wherein the fluoborate wear-resistant pour point depressant contains long-chain alkyl in the shape of a pour point depressant, after the fluoborate wear-resistant pour point depressant is added into the base oil, the side-chain alkyl of the fluoborate wear-resistant pour point depressant is co-crystallized with wax, and a polar main chain is left outside a crystal to play a shielding role, so that the flow resistance of the lubricant is reduced, and a pour point depressing role is played; under the friction condition, the fluoborate in the structure can chemically react with metal elements in mechanical equipment to generate fluoride and boron-containing compounds with high hardness and wear resistance, so that the friction coefficient is reduced, and meanwhile, the quaternary ammonium salt has excellent corrosion resistance; the lubricant prepared by the invention can meet the normal operation requirement of equipment in a low-temperature environment.

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 invention discloses an integrated reaction process for efficiently converting fluorosilicic acid to prepare potassium fluoroborate, which relates to the field of inorganic fluorine chemical technology. The process solves the problems of severe sodium pollution, low reaction efficiency, and waste of resources in traditional processes by using disodium EDTA to complex metal impurities, Fe-TiO2 catalytic condensation reaction, K2CO3 / nano-γ-Al2O3 composite desiliconization, ion exchange deep sodium removal, and mother liquor closed-loop circulation technology. The composite desiliconizer increases the desiliconization rate to 96%, nanocatalysis shortens the reaction time by 40%, the mother liquor recycling rate reaches 80%, and silicon slag is converted into high-value-added nano-silica. The product of the present invention has a purity of ≥99.5% and a sodium residue of ≤0.003%, and is suitable for the industrial production of electronic-grade potassium fluoroborate.

The invention relates to a preparation method and a reaction device of fluoboric acid diazonium salt, the preparation method comprises the following steps: (1) a first reaction material is introduced into a first microchannel reactor for a diazotization reaction to obtain a first reacted material, and the first reaction material comprises an o-fluoroaniline hydrochloride solution and a nitrite solution; and (2) introducing a fluoboric acid solution and the first reaction post-material into a second microchannel reactor, and carrying out a salt forming reaction to obtain a second reaction post-material containing fluoboric acid diazonium salt. The micro-channel reactor is used for carrying out diazotization reaction and salt forming reaction, and the diazotization reaction and the salt forming reaction can be accurately controlled, so that the reaction stability is improved, and a high-purity product is obtained.

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.

The invention relates to a method for analyzing ceramic grains of a multilayer ceramic capacitor, and belongs to the technical field of multilayer ceramic capacitors. The invention provides a method for analyzing ceramic crystal grains of a multilayer ceramic capacitor, which comprises the following steps of: grinding and polishing the multilayer ceramic capacitor until an inner electrode layer is exposed, corroding the inner electrode layer by adopting a corrosive liquid to expose the ceramic crystal grains, and analyzing the ceramic crystal grains, the corrosive liquid comprises a sulfamic acid solution and a fluoboric acid solution. The corrosive liquid can accurately dissolve an electrode layer in the multilayer ceramic capacitor, so that complete and clear crystal particles are exposed on the premise of not damaging crystal grains.

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.

The invention provides a wide-temperature-range electrolyte and a preparation method thereof, a battery and electric equipment. Relates to the technical field of lithium batteries. The preparation method comprises the following steps: mixing fluoroethylene carbonate, perfluorohexanoic acid and diethyl tetrafluoroborate for reaction to obtain a functional solution; trimethyl borate and sulfuric acid are used for carrying out surface modification treatment on carbon nanofibers to form a B-CNF material; and embedding the B-CNF material into the hydrogen bond dynamic network of the functional solution to obtain the wide-temperature-range electrolyte. According to the preparation method, by constructing a hydrogen bond dynamic network and embedding the modified B-CNF material, the balance of low viscosity at low temperature and high stability at high temperature is realized, meanwhile, the ion conduction performance is improved, the performance of the battery in a wide temperature range is remarkably enhanced, and the high-temperature adaptability requirement is met.

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.