69results about How to "Reduce precipitation" patented technology

The invention provides a high-shock-resistance low-precipitation phosphate ceramic structure adhesive which comprises the following components in parts by weight: 100 parts of aluminum dihydrogen phosphate, 8-15 parts of zinc oxide powder, 35-45 parts of flaky aluminum oxide powder, 5-10 parts of nano zirconium oxide powder and 0.5-2 parts of layered zirconium phosphate powder. The ceramic further comprises 0.5-2 parts of titanium oxide powder and 5-10 parts of spherical aluminum oxide powder. The invention also discloses a preparation method and application of the adhesive. The adhesive disclosed by the invention can work for a long time at 500 DEG C or below, has high strength retention rate at high temperature, and solves the problem of easy failure at high temperature; through the toughening design, the impact resistance and thermal shock resistance are remarkably improved, and cracking in use is effectively prevented; the paint has good stability to acid, alkali, solvents and other chemical media, and is suitable for partial corrosive environments; the ion precipitation rate is extremely low, and the strict requirements of the fields of biological medicine, food and the like on the material purity are met; and the curing temperature is moderate, a precise matrix is not easy to damage, and on-site construction and complex structure bonding are facilitated.

The invention relates to the technical field of polyethylene films, and particularly discloses a low-precipitation polyethylene film and a preparation method thereof. The low-precipitation polyethylene film is prepared from the following raw materials: polyethylene, silicon carbide nanowires, nano talcum powder, an antioxidant and glyceryl stearate. The alkane precipitation amount of the obtained polyethylene film is 5 ppm or below, and precipitation of alkane molecules of the polyethylene film is obviously reduced.

The present application provides a collecting device for condensate wellhead, comprising a production mechanism including a tubing arranged in a casing and used for receiving fluid from the condensate wellhead, a collecting mechanism including a separation assembly connected with the tubing and a collector arranged below the separation assembly, and a reinjection mechanism including a first pipeline arranged between the separation assembly and the casing, wherein the fluid can be separated into gas phase and liquid phase under the action of the separation assembly, the liquid phase enters the collector, and a first part of the gas phase flows to an annulus between the tubing and the casing through the first pipeline, and a second part of the gas phase flows to outside through a second pipeline. The present application ensures that the fluid from the condensate wellhead can be fully separated, so as to improve the yield of condensate oil.

The invention discloses a preparation method of a corrosion inhibitor for magnesium alloy cutting fluid, which specifically comprises the following steps: heating dodecenyl succinic anhydride to 80-100 DEG C, adding triethylene glycol monobutyl ether with equal molar ratio into the dodecenyl succinic anhydride, and carrying out esterification reaction for 4-5 hours to obtain the corrosion inhibitor. The corrosion inhibitor prepared by the method disclosed by the invention is added into the magnesium alloy cutting fluid, so that the magnesium alloy cutting fluid has good lubricating performance and also has good hard water resistance and good corrosion inhibition performance, on one hand, a compact adsorption film layer can be formed on the surface of a magnesium alloy; on the other hand, the magnesium alloy cutting fluid can rapidly capture the precipitated magnesium ions and uniformly disperse the magnesium ions in the cutting fluid, so that the conditions of demulsification and failure of the cutting fluid caused by rapid increase of water hardness can be effectively prevented, and the service life of the magnesium alloy cutting fluid is greatly prolonged.

The utility model relates to the field of montmorillonite production, in particular to a suspension conveying device for montmorillonite production, which comprises a conveying pipe, a plurality of processing units are arranged on the conveying pipe, each processing unit comprises a booster pump and a stirring mechanism, and the booster pump and the stirring mechanism are connected in series through the conveying pipe. The suspension is stirred through the stirring mechanism, and the booster pump provides power for the montmorillonite suspension, so that the power lost by the suspension in the stirring process is made up, the conveying speed of the suspension is ensured, the montmorillonite suspension is not prone to precipitation, the drug effect of the montmorillonite suspension is ensured, and meanwhile pipeline blockage is reduced.

The utility model relates to chemical synthetic technical field, concretely is a kind of production system of industrial grade ethylsilane, including the ethylsilane production unit, heat exchange unit, gas-liquid separation unit, ethylsilane temporary storage tank connected in turn;Ethylsilane production unit includes hydrogen preheater, methylsilane preheater, ethylsilane reactor, wherein, hydrogen preheater and methylsilane preheater one end are all provided with inlet pipe, and other end is all connected with ethylsilane reactor, and ethylsilane reactor is connected with heat exchange unit;Heat exchange unit is also connected with hydrogen circulation unit and methylsilane circulation unit.Hydrogen recovery recycling, after a period of time, the hydrogen generated in the reaction process can meet the operation required of ethylsilane production unit, stop external hydrogen supply;Methylsilane recovery recycling, save material, reduce consumption.

This invention belongs to the field of scalp care formulation technology, and discloses a soothing, antibacterial, anti-hair loss, and hair-strengthening formulation with peptides and plant active ingredients, and its preparation method. The formulation includes a stabilized peptide-plant active ingredient pre-complex liquid, a matrix moisturizer, a scalp conditioner, a thickener, a pH adjuster, a preservative, and deionized water. The pre-complex liquid is prepared by pre-dispersion, weakly acidic pre-complexation, and stabilization treatment of licorice extract, scutellaria baicalensis extract, rosemary extract, hydrolyzed keratin peptides, plant-derived hydrolyzed peptides, glycerin, 1,3-propanediol, β-glucan, and sodium hyaluronate. In preparation, a plant active ingredient pre-dispersion liquid is first formed, then a low-molecular-weight peptide complex is added, followed by β-glucan and sodium hyaluronate for stabilization, and finally mixed with the formulation matrix and the pH is adjusted. This invention is beneficial for improving the dispersion stability, scalp and hair surface retention, and antibacterial persistence of plant active ingredients, and is suitable for soothing, antibacterial, anti-hair loss, and hair-strengthening care.

The application provides an aluminum pad structure and a manufacturing method thereof. The manufacturing method of the aluminum pad structure comprises the following steps: sequentially forming a first aluminum layer, a protective layer and a passivation layer on a substrate; performing dry etching on the passivation layer by using a plasma containing fluoride ions to form a passivation layer opening, wherein the passivation layer opening is located above a preset region of the first aluminum layer and the bottom surface of the passivation layer opening stays on the surface of the protective layer; then forming a second aluminum layer on the protective layer and removing the part of the second aluminum layer which is higher than the passivation layer, thereby obtaining a sandwich-type aluminum pad structure composed of the first aluminum layer, the protective layer and the second aluminum layer. The manufacturing method of the aluminum pad structure can avoid the direct contact of the etching process with the aluminum pad, thereby eliminating the generation of aluminum fluoride compound residues and fluoride ion residues on the surface of the aluminum pad from the root. The aluminum pad structure is in a sandwich type, has less aluminum fluoride compound residues and fluoride ion residues, is beneficial to improve the bonding and yield test results, and reduces fluorine precipitation.

This invention discloses a flame-retardant interface-stabilized electrolyte for high-voltage layered oxide sodium-ion batteries and its preparation method. The electrolyte comprises a composite sodium salt and a mixed organic solvent. The composite sodium salt includes sodium difluorosulfonylimide, sodium oxalate borate, and / or sodium difluorooxalate borate. The mixed organic solvent includes a phosphate ester flame-retardant solvent, a sulfone solvent, a hydrofluoroether diluent, and a small amount of electron-deficient nitrogen-containing aromatic nitrile interface-regulating molecules. This electrolyte does not rely on conventional additives such as ethylene carbonate and fluoroethylene carbonate. Through the flame-retardant framework solvent, anion-dominated film formation, and the regulating effect of electron-deficient aromatic nitrile on the residual alkali of layered oxides and the surface of high-valence transition metals, a stable and oxidation-resistant protective interface is formed on the positive electrode surface, while simultaneously ensuring low-resistance film formation on the hard carbon negative electrode side. This invention is applicable to high-voltage layered oxide sodium-ion batteries with cutoff voltages from 4.15 V to 4.50 V, and can simultaneously improve safety, long-cycle stability, and high-temperature storage performance.

The invention belongs to the technical field of flow batteries, and relates to an electrolyte containing a polyanionic electrolyte additive and a flow battery. Comprising a viologen compound, a supporting electrolyte, a solvent and a polyanionic electrolyte additive, the polyanionic electrolyte additive accounts for 0.1%-20% of the electrolyte in percentage by mass; molecules of the polyanionic electrolyte additive are rich in various functional groups with negative charges, and the polyanionic electrolyte additive is used for interfering the pi-pi accumulation behavior of viologen molecules; the polyanionic electrolyte additive is a polymer containing a repetitive unit, and is sodium polystyrenesulfonate, sodium polyacrylate, poly (2-acrylamido-2-methyl sodium propanesulfonate) or sodium alginate. By introducing a polymer carrying high-density negative charges in the structure or aggregated inorganic anions, multiple regulation and control effects on viologen molecules in a water-phase environment are realized, aggregation behaviors of reduced molecules of the viologen molecules are remarkably inhibited, and chemical and electrochemical stability of the electrolyte is improved.

The application discloses a kind of based on gray scale control 3D printing appliance step-by-step solidification method.The method includes: the light-sensitive resin used is prepared, and the light-sensitive resin includes epoxy acrylate component, a certain amount of thermal initiator is added in the light-sensitive resin;The region corresponding to the specified tooth is segmented from the 3D printing model of appliance, and the pattern gray scale of the region corresponding to the specified tooth is modified;The 3D printing model of appliance is sliced, and a plurality of slice patterns with gray scale processing are obtained;Based on a plurality of slice patterns, the gray scale photocuring treatment of each layer of appliance is completed;The appliance after gray scale photocuring treatment is placed in oven to heat for specified time at specified temperature.The application is based on gray scale control, uses photocuring, thermal curing step-by-step solidification scheme in the process of 3D printing appliance, reduces the internal monomer amount while guaranteeing the mechanical property of 3D printing appliance, can effectively reduce the precipitation of monomer, and improve biocompatibility.

This invention provides a composite anode material, its preparation method, and its application. The preparation method includes the following steps: mixing and lithiating graphene material and lithium metal material in a protective atmosphere to obtain lithiated graphene material; wherein both the graphene material and the lithium metal material are in particulate form; mixing the metal material and the lithiated graphene material and heating to obtain the composite anode material. The composite anode material obtained by the preparation method of this invention is a lithium alloyed graphene material, which can guide the uniform deposition of metallic lithium, reduce the probability of lithium dendrite formation, and provide more electron pathways, enhancing lithium diffusion, thereby reducing the gap between the anode material and the solid electrolyte, reducing battery impedance, and improving battery cycle performance and rate performance.

The application discloses a low-volatility high-thermal-conductivity insulating silica gel composite material suitable for power batteries, characterized by comprising the following components in mass parts: 3-10 parts of vinyl silicone oil, 8-20 parts of liquid acrylic ester rubber, 95-105 parts of compounded thermal conductive powder, 0.3-0.5 parts of hydrogen-containing silicone oil, 0.02-0.04 parts of platinum catalyst, 0.02-0.05 parts of acetylenic alcohol inhibitor and 0.8-2.0 parts of silane modifier. The low-volatility high-thermal-conductivity insulating silica gel composite material adopts low-volatility vinyl silicone oil and liquid acrylic ester rubber as a composite matrix, can effectively coat the vinyl silicone oil at a very low content and the compounded thermal conductive powder at a high content, avoids problems such as sharp increase of dispersion resistance and particle agglomeration in the modification and subsequent mixing process of the thermal conductive powder, and can stabilize the thermal conductivity coefficient at more than 6.5 W / (m*K), the volatilization amount is less than 90 ppm, and can be used in the range of -40 DEG C to 200 DEG C.

The utility model provides a kind of double-hole super-vortex formula flushing toilet, it is related to flushing toilet technical field, and it includes: toilet bowl, the water tank is installed in the side of toilet bowl, the top of inside the toilet bowl is provided with flushing structure, the top of one end of water tank side is installed with inlet pipe, one end of inlet pipe is installed with intelligent water valve, the bottom of intelligent water valve is installed with connecting pipe, the bottom of connecting pipe is provided with filter structure.The utility model, by setting flushing structure, water in water tank is pumped by suction pipe through water pump, then it is transported to the inside of water delivery pipe through pipe, and it is sprayed by the opposite orientation of two water outlets, by setting filter structure, the first layer filtration of water is carried out by filter screen frame one and filter screen frame two, further filtration of water is carried out by filter screen frame three and filter screen frame four, and the last filtration of water is carried out by filter screen frame five and filter screen frame six.

The invention relates to an aluminum alloy soldering lug and a preparation method and application thereof, and belongs to the technical field of welding. The aluminum alloy soldering lug disclosed by the invention is prepared from the following elements in percentage by mass: 3.0 percent to 4.5 percent of Si, 2.0 percent to 3.5 percent of Fe, 0.8 percent to 1.2 percent of Mg, 0.10 percent to 0.25 percent of Zr, 0.05 percent to 0.15 percent of Sc, 0.02 percent to 0.08 percent of Er, 0.05 percent to 0.12 percent of Ti, 0.005 percent to 0.02 percent of B and the balance of Al and other inevitable impurities. The mass ratio of (Zr + Sc) / Fe is 0.08 to 0.15; the mass ratio of Mg to Si is 0.25 to 0.35; the mass ratio of (Fe + Si) to (Zr + Sc + Er) is 20-25; the problems that laser welding aluminum alloy is thick in weld joint structure and uneven in performance, and a dissimilar material welding interface is embrittled are fundamentally solved.

The application discloses a method for preparing lithium pre-doped amine coordination manganese iron phosphate precursor from lithium manganese iron phosphate, and belongs to the field of battery recycling. The method comprises the following steps: stirring and reacting lithium manganese iron phosphate battery material with a high-valence iron salt solution and a surfactant, and filtering to obtain filtrate and phosphorus iron residue; mixing the filtrate with a phosphate, adjusting the pH of the solution to 2-6, then mixing with an oxidizing agent A, and adding a mixed solution containing an organic amine compound to perform nucleation precipitation reaction, and aging to obtain the lithium pre-doped amine coordination manganese iron phosphate precursor. The application utilizes the surfactant and the high-valence iron salt to efficiently replace divalent iron under acid-free or weak acid conditions, generates a metal solution containing Li + , Fe 2+ , Mn 2+ , performs oxidation to form nucleation precipitation, adds an organic amine compound to control the morphology of the generated particles in the solution, generates the lithium-doped amine coordination manganese iron phosphate precursor, the reaction condition is mild, the energy consumption in the treatment process is low, and the economic utilization value of a manganese byproduct is improved.

This invention provides a flame-retardant, high-transmittance, and weather-resistant composite material for LED lampshades and its preparation method. By weight, the raw materials include: 80-95 parts bisphenol A type polycarbonate, 4-10 parts phenyl-containing polysiloxane microspheres, 1-4 parts mesoporous silica phosphorus-loaded microspheres, 0.3-0.8 parts silane coupling agent, 0.3-0.8 parts flame retardant, 2-5 parts organic nano-montmorillonite, 0.2-0.6 parts polycarbodiimide, 0.3-0.8 parts antioxidant, 0.3-0.7 parts light stabilizer, and 0.3-1.0 parts lubricant. The flame-retardant, high-transmittance, and weather-resistant composite material for LED lampshades provided by this invention possesses comprehensive properties of high light transmittance, high toughness, and heat resistance.

The application discloses a power monitoring multifunctional instrument convenient to install, and relates to the technical field of multifunctional instruments.The power monitoring multifunctional instrument convenient to install comprises a protection device.The power monitoring multifunctional instrument convenient to install is characterized in that a cover plate slides in the inner side of a slide rail, so that the cover plate is convenient to disassemble and place components;the monitoring instrument is supported by a supporting plate, so that the monitoring instrument is convenient to fix;the monitoring instrument is extruded by a clamping mechanism, so that the clamping mechanism can fix components;the components are reduced to shake, the components are reduced to shake in the equipment, the stability of the components is improved;air flow is transported into the protection shell by a treatment device, so that the treatment device can ventilate and radiate heat, the temperature of the components in the equipment is prevented from being too high, the components are prevented from malfunctioning, moisture in the air flow is absorbed during the air supply of the treatment device, so that water vapor and dust are reduced to enter, the pollution of the equipment by the outside is reduced, and the equipment is kept to normally operate.

The invention discloses photovoltaic glass, a preparation method of the photovoltaic glass, a photovoltaic module and application of the photovoltaic module, and belongs to the technical field of photovoltaic glass. The photovoltaic glass comprises former oxides SiO2 and B2O3, intermediate oxides Al2O3, ZrO2, TiO2 and ZnO, and external grid oxides Fe2O3, CaO, MgO, Na2O, K2O, Sb2O3 and SO3, the former oxides play a role in improving the grid structure of the glass and enhancing the mechanical properties of the glass, and the intermediate oxides can repair a glass network and improve the physical and chemical properties of the glass. The network outer body can reduce ion precipitation on the basis of improving the glass performance so as to improve the weather resistance of the glass. The weather resistance and the structural stability of the photovoltaic glass can be comprehensively improved, free ion precipitation is reduced, the glass crystallization and fogging tendency is inhibited, meanwhile, the mechanical performance is improved, the high light transmittance is maintained, and the photovoltaic glass is suitable for the offshore environment, applied to photovoltaic modules and beneficial to popularization of the offshore photovoltaic power generation technology.

The application discloses a method for constructing an internal dumping site based on a fly ash-based cementing material carbon dioxide storage, and utilizes the cementing properties of fly ash of a pit mouth coal-fired power plant to prepare a fly ash-based cementing material with super high content, and utilizes the high-strength fly ash-based cementing material to construct a carbon dioxide storage, and utilizes a cement-free low-strength fly ash-based cementing material to backfill an open-pit mine pit, so that the resource utilization and efficient collaborative disposal of fly ash solid waste are realized; the carbon dioxide storage is constructed in the internal dumping site space, the open-pit mining space is effectively utilized, and the problem of insufficient material for land reclamation backfilling in the late mining stage is solved; the carbon dioxide storage reinforced by the anchor rod prestress has high strength and large internal space, the mine pit bottom plate impermeable layer and the overlying clay cover layer increase the airtightness, and the safe and efficient large-scale storage of critical state carbon dioxide is realized; the fly ash-based cementing material can mineralize carbon dioxide in a humid environment, increases the carbon dioxide storage amount, and improves the carbon dioxide storage strength and airtightness.

The invention provides austenitic stainless steel as well as a preparation method and application thereof, and relates to the field of high-temperature-resistant austenitic stainless steel. The austenitic stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.10% of C, less than or equal to 0.12% of N, less than or equal to 2.0% of Si, 1.0-2.0% of Mn, 16.0-18.0% of Cr, 10.0-14.0% of Ni, 2.0-3.0% of Mo, 0.05-0.10% of Nb, 0.05-0.10% of Ti, less than or equal to 0.02% of S, 0.04-0.06% of P and the balance of Fe and inevitable residual elements. The content of P in the stainless steel is increased, the diffusion rate of solute atoms such as Cr and Mo can be reduced through interaction of P and vacancies at the high temperature, nucleation of M23C6 carbides and the like at the grain boundary is inhibited, the precipitation number is remarkably reduced, meanwhile, P is discharged outwards in the coarsening process of the M23C6 carbides, a core-shell result that the M23C6 carbides are wrapped by the P element is formed, the coarsening rate of the M23C6 carbides is reduced, and the corrosion resistance of the stainless steel is improved. Furthermore, a creep cavity caused by a precipitated phase in the creep process is inhibited, and the creep fracture strength is improved.

This invention provides an improved processing method for laterite nickel ore. The improved method includes: Step S1, acid leaching followed by filtration and washing of the laterite nickel ore to obtain a post-leaching solution and a first leaching residue; Step S2, where Step S2 is selected from any one of Steps S2-1, S2-2, and S2-3; Step S3, using a precipitant to perform a first-stage precipitation of nickel and cobalt in the solution after aluminum and scandium removal or iron and aluminum removal, followed by thick filtration to obtain a first-stage precipitated nickel and cobalt solution and nickel and cobalt hydroxide product; Step S4, using a nickel and cobalt neutralizing agent and an oxidizing agent to perform a second-stage precipitation of nickel and cobalt in the first-stage precipitated nickel and cobalt solution to obtain magnesium manganese sulfate solution and nickel-cobalt-manganese slurry. Traditional processes utilize compressed air to oxidize ferrous iron, resulting in energy waste. This application uses manganese-containing substances as an oxidizing agent to oxidize ferrous iron to ferric iron, which not only solves the problem of slow oxidation rate of ferrous iron at low pH and waste of compressed air, but also improves the scandium recovery rate.

The utility model discloses a lubricating oil layered distillation recovery device which comprises a distillation retort, a distillation retort cover is arranged at the top end of the distillation retort, an oil inlet pipe for feeding lubricating oil is fixedly installed at the top end of the distillation retort cover, a discharging pipe is fixedly installed at the bottom end of the distillation retort, and a mixing assembly for increasing heating uniformity is arranged in the distillation retort. The mixing assembly comprises a connecting gear arranged in the distillation retort, a rotating block rotationally connected with the connecting gear and a rotating motor fixedly mounted at the top end of the distillation retort cover, and the output shaft end of the rotating motor penetrates through the distillation retort cover and the connecting gear to be fixedly mounted with the rotating block; connecting blocks are uniformly and fixedly mounted on the periphery of the rotating block in a surrounding manner; according to the utility model, the mixing assembly can drive the stirring blades to rotate in the distillation retort in the form of autorotation and revolution, so that the heating uniformity of lubricating oil during distillation is improved, and the distillation efficiency is improved.

The present application relates to a cement-based immobilized manganese ore-agricultural and forestry waste composite denitrification filler and its preparation method and application. The filler comprises a cement-based porous framework, and agricultural and forestry waste powder and manganese ore powder co-dispersed and immobilized in the cement-based porous framework; the agricultural and forestry waste powder is selected from one or more of sawdust powder, corn cob powder and straw powder; the redox characteristics of manganese oxides in the manganese ore powder are used to strengthen the organic matter degradation and denitrification process, realizing heterotrophic denitrification and manganese-mediated autotrophic denitrification synergistic denitrification. In preparation, the solid raw materials are dry mixed, water and a foaming agent are added for shaping, and the shaped product is watered and cured at 20-30 DEG C for 7-14 days to obtain the composite filler. The filler can continuously provide carbon source and autotrophic denitrification electron donor within a certain period, and provide an interface for microbial attachment, and is suitable for advanced denitrification of low C / N nitrate-containing wastewater such as tail water of a municipal sewage plant.

This invention discloses a treatment device for metal surfaces, relating to the field of metal processing technology. It includes an electroplating tank and mounting mechanisms located on both sides of the tank. Anode plates are arranged on both sides inside the electroplating tank, and the anode plates are detachably installed to the inner wall of the tank via the mounting mechanisms. A scraping mechanism for scraping sludge from the anode plate surface is installed on the mounting mechanism. Through the cooperation of the scraping mechanism and the mounting mechanism, during the electroplating of metal parts, the weight of the electroplating rack or cylinder and the metal parts drives the scraping component downwards. During this downward movement, the scraping component scrapes the anode plate surface, reducing residual anode sludge and ensuring the performance of the anode electrode. After electroplating is completed, when the electroplating rack or cylinder is removed from the electroplating tank, an automatic reset mechanism drives the scraping component back to its initial position, and during the return process, it scrapes the anode plate surface again, improving the surface removal effect.

The present application relates to the technical field of pressure sensitive adhesive, in particular to a plastic film type low VOC environment-friendly pressure sensitive adhesive product.The plastic film type low VOC environment-friendly pressure sensitive adhesive product is composed of the following raw materials: methyl methacrylate, butyl acrylate, diacetone acrylamide, 2-ethylhexyl acrylate, vinyl trimethoxysilane, hydroxyethyl acrylate, reactive emulsifier, anionic emulsifier, non-ionic emulsifier, ammonium persulfate, sodium bisulfite, adipic acid dihydrazide, sodium bicarbonate, nano calcium carbonate, deionized water and pH regulator.The plastic film type low VOC environment-friendly pressure sensitive adhesive product has excellent holding power, peeling strength, durability and environmental protection.

The application discloses a kind of containing γ-amino butyric acid macroelement water-soluble fertilizer and preparation method thereof, including the following components are made: each component is by mass percentage number, γ-amino butyric acid 0.5%~3.0%, nitrogen source 15%~25%, phosphorus source 8%~15%, potassium source 20%~30%, trace element combination 0.1%~1.0%, the balance is deionized water, the γ-amino butyric acid is generated by enzyme catalysis L-glutamic acid directional conversion, catalytic process uses immobilized glutamic acid decarboxylase, reaction system pH control is 4.5~5.5, temperature control is 35~40 DEG C, the trace element combination is made by Fe-EDTA, Zn-EDTA, boric acid is compounded according to mass ratio 3:2:1, the application a kind of containing γ-amino butyric acid macroelement water-soluble fertilizer and preparation method thereof, enzyme catalysis L-glutamic acid directional conversion generates γ-amino butyric acid, avoid the harmful by-products possibly remaining of chemical synthesis method, meet green agricultural development needs, simultaneously select immobilized glutamic acid decarboxylase as catalyst, compared with free enzyme, its stability is significantly improved.

The utility model provides an electrode assembly and a secondary battery. The electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm structure arranged between the positive pole piece and the negative pole piece, the positive pole piece is provided with first equal-thickness parts, the negative pole piece is provided with second equal-thickness parts, the compaction density of the first parts of the first equal-thickness parts is larger than that of the second parts, the number of the first parts is two, and the number of the second parts is two. The second part is located between the two first parts in the width direction of the electrode assembly; and / or the compaction density of the fourth part of the second equal-thickness part is larger than that of the third parts, and the fourth part is located between the two third parts in the width direction; and / or the ionic conductivity of the first region of the diaphragm structure is smaller than that of the second regions, and the first region is located between the two second regions in the width direction. According to the utility model, the problem that the capacity of the secondary battery is reduced due to the lithium precipitation phenomenon of the secondary battery in the prior art is solved.

The invention discloses a nickel-based tungsten-doped high-temperature self-lubricating material and a preparation method thereof. The method comprises the steps that firstly, tungsten powder is pretreated through aqua regia and then poured into electroplating liquid to be subjected to ultrasonic mixing, and nickel-plated tungsten powder is prepared; 2, the nickel-plated tungsten powder, nickel powder, molybdenum powder, rare earth yttrium powder and calcium fluoride are proportioned and weighed, and composite material raw powder is obtained; 3, pouring the composite material raw powder into an ethanol solution, mixing, stirring and drying to obtain composite powder; 4, carrying out ball milling on the composite powder to obtain uniform composite powder; and 5, carrying out plasma sintering on the composite powder to obtain the nickel-based tungsten-doped high-temperature self-lubricating material. According to the nickel-based tungsten-doped high-temperature self-lubricating material, the Ni-Mo alloy serves as a base body, the high-temperature strength, hardness, abrasion resistance and self-lubricating performance of the nickel-based tungsten-doped high-temperature self-lubricating material are improved by adding the nickel-plated tungsten powder and the rare earth Y, CaF2 is introduced to serve as a composite lubricant, the self-lubricating effect is enhanced, spark plasma sintering is combined, the compactness of the material is improved, and the service life of the material is prolonged. The method is suitable for aerospace, high-speed carrying and other fields.

This invention discloses an iron-based welding wire for CMT welding of austenitic stainless steel / carbon steel composite pipes, comprising flux powder and welding scale. The flux powder comprises the following components by mass percentage: Cr 23.0~28.0%, Ni 28.0~32.0%, Mo 15.0~18.0%, Nb 2.0~4.0%, Co 3.0~5.0%, Y₂O₃+La₂O₃ 0.4~0.8%, with the remainder being Fe, and the sum of the mass percentages of the above components being 100%. This welding wire solves the problems of high-hardness phases and insufficient corrosion resistance in existing stainless steel composite welding. This invention also discloses a method for preparing the iron-based welding wire for CMT welding of austenitic stainless steel / carbon steel composite pipes and a method for using this welding wire to weld austenitic stainless steel / carbon steel composite pipes.