23results about How to "Good batch stability" patented technology

The invention provides lithium sulfide as well as a preparation method and application thereof. The preparation method of the lithium sulfide comprises the following steps: providing a mixed solution containing a lithium-containing compound and liquid sulfur which are uniformly mixed, and enabling the mixed solution to be in contact with a reducing gas so as to carry out a lithium sulfide synthesis reaction, after the synthesis reaction of the lithium sulfide is finished, at least removing part of sulfur in the obtained reaction mixture to obtain a crude finished product; and calcining the crude finished product to convert lithium polysulfide in the crude finished product into lithium sulfide to obtain a lithium sulfide product. According to the preparation method provided by the invention, the high-purity lithium sulfide is prepared by a one-pot method, the liquid sulfur is used as a reaction raw material and a reaction solvent, and the whole reaction process does not need to use an organic solvent; according to the method, the lithium salt conversion rate can reach 99% or above, and the purity of the obtained lithium sulfide can reach 99.99% or above; compared with the prior art, the reaction temperature is lower, and low energy consumption and high conversion rate are both considered.

The invention belongs to the technical field of precious metal electronic paste, and particularly relates to a preparation method and application of submicron spherical gold-platinum-palladium alloy powder used for being matched with low-temperature co-fired ceramics. The preparation method comprises the following steps: mixing a tetrachloroauric acid solution, a hexachloroplatinic acid solution and a tetrachloropalladium (II) acid solution to obtain a gold-platinum-palladium mixed solution; the gold-platinum-palladium mixed solution, the dispersing agent solution and the modified reducing agent solution are mixed for a second time, after a reduction reaction is conducted, static settlement and solid-liquid separation are conducted in sequence, obtained solids are washed and dried in sequence, and the obtained submicron spherical gold-platinum-palladium alloy powder used for being matched with the low-temperature co-fired ceramic has the advantages of being uniform in particle size, free of agglomeration, high in dispersity and the like. After low-temperature co-firing with a ceramic substrate, the substrate has the characteristics of flatness, no bubble, excellent weldability and soldering resistance, good batch stability and the like.

The invention relates to the technical field of fine chemical engineering, in particular to superfine ground calcium carbonate for a high-specific-surface-area low-moisture sealant as well as a preparation method and application of the superfine ground calcium carbonate. The preparation method comprises the following steps: mixing calcite particles with a compound grinding aid, and carrying out wet grinding to obtain a ground product; performing multiple grading treatment on the ground product to obtain a graded product; mixing the graded product with a moisture scavenger and a modifier, and modifying to obtain superfine heavy calcium carbonate; in the superfine heavy calcium carbonate, the content of particles smaller than or equal to 2 microns in calcium carbonate is larger than or equal to 85 wt%, D97 is smaller than or equal to 2.7 microns, the specific surface area is larger than or equal to 9 m < 2 > / g, and the water content is smaller than or equal to 500 ppm, the problems that traditional heavy calcium carbonate is poor in reinforcing effect, relatively high in water content and prone to sedimentation are solved, the dehydration time can be saved, the production efficiency can be improved, and the requirements of downstream customers are met; meanwhile, the stability of batches is good, the anti-settling effect is good, and part of light nano-calcium can be replaced in sealant production.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a lithium-rich manganese-based positive electrode precursor material, a preparation method thereof, a positive electrode material and a battery. The lithium-rich manganese-based positive electrode precursor material comprises an inner core and a shell layer on the surface of the inner core, the inner core is formed by staggered arrangement of sheet-shaped primary particles, the shell layer is formed by radial arrangement of plate-shaped primary particles perpendicular to the surface of the inner core along a diametral plane, so that a loose-inside and tight-outside structure is formed, and the precursor material of the structure is good in stability and good in stability. And the lithium-rich manganese-based positive electrode material prepared from the lithium-rich manganese-based positive electrode material also has good cycling stability. The lithium-rich manganese-based positive electrode precursor material is prepared through a two-step coprecipitation method, and the preparation method is simple and controllable.

The application discloses a high-thermal-stability high-nickel ternary material, a preparation method and application. The application utilizes the characteristic that the high-nickel ternary material is sensitive to water, reconstructs a layer of NiOOH on the surface of the high-nickel ternary material, changes the NiOOH coating layer into various transition metal oxyhydroxides by means of an ion exchange reaction, constructs a layer of phosphide on the surface of the transition metal oxyhydroxide through a phosphorization reaction, finally, decomposes the various transition metal oxyhydroxides into high-entropy oxides by means of high-temperature calcination, and then obtains a high-nickel ternary material coated with double layers; the high-entropy oxides have high thermal stability and lithium ion conductivity. In-situ construction of the high-entropy oxide coating layer can not only improve the thermal stability of the high-nickel material, but also help to improve the rate performance and cycle performance of the high-nickel ternary material. The phosphide has strong conductivity, and in-situ coating of the phosphide on the surface of the high-entropy oxide can form a complementary advantage with the high-entropy oxide, and further improve the rate performance of the high-nickel ternary material.

The invention provides a hollow nano silicon-carbon composite material, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. According to the preparation method disclosed by the embodiment of the invention, the hollow nano silicon-carbon composite material is prepared by adopting a sacrificial template method, the surface of a silicon nanowire is coated with a template layer through the step S1, then the template layer is coated with a high-molecular polymer through the step S2, and then the high-molecular polymer is subjected to high-temperature carbonization through the step S3 to obtain a carbon coating layer, so that the hollow nano silicon-carbon composite material is obtained. And after the template layer is etched through the step S4, a gap layer is formed between the silicon nanowire and the carbon coating layer, and the hollow nano silicon-carbon composite material can be obtained. The gap layer can provide a space for volume expansion of the silicon nanowires, and the carbon coating layer can improve the conductivity of the composite material, so that the purpose of improving the cycle performance and the conductivity of the battery is achieved.

The invention provides a sulfide-halide composite solid electrolyte, a preparation method thereof and a solid-state battery. The method comprises the following steps: mixing and ball-milling a sulfide electrolyte, a halide electrolyte, a dopant and an interface modifier under the protection of inert gas to obtain composite electrolyte powder; carrying out tabletting molding on the composite electrolyte powder under the protection of inert gas to obtain a composite solid electrolyte sheet; and carrying out annealing treatment on the composite solid electrolyte sheet under the protection of inert gas to obtain the sulfide-halide composite solid electrolyte. The sulfide-halide composite solid electrolyte disclosed by the invention can realize synergistic improvement of various properties, has high room-temperature ionic conductivity and a wide electrochemical stability window, is improved in air stability and is good in mechanical property.

This utility model discloses a novel submersible motor upper seat structure for wells, including a motor upper seat with an oil chamber and a bearing chamber inside. A mechanical seal chamber is located above the bearing chamber for installing the mechanical seal. The oil chamber and the mechanical seal chamber are connected by a slot. Positioning holes are evenly distributed along the circumference of the side of the motor upper seat, with the positioning holes positioned higher than the highest point of the oil chamber, and the highest point of the mechanical seal chamber higher than the oil chamber. This utility model modifies the positional relationship between the oil chamber, the mechanical seal chamber, and the positioning holes, reducing quality risks in casting and machining, improving product quality and production efficiency; it increases oil saturation, completing oil injection in one step, significantly saving labor costs; the upper seat is made of hard-anodized aluminum alloy, which has low cutting resistance, is easy to machine, causes less tool wear, is less prone to corrosion, has minimal impact on the appearance of the electric pump, and has a cost similar to that of gray cast iron upper seats. Aluminum alloy is lightweight, reducing transportation and assembly costs, and has good thermal conductivity, which can lower the temperature of the motor during operation.

The application discloses a kind of high wear-resistant tubular conveying belt rubber composition and preparation method thereof, specifically related to rubber material technical field, the rubber composition includes rubber matrix, Ti3C2T x MXene nanosheet, epoxy soybean oil, bis (triethoxysilylpropyl) tetrasulfide, wear-responsive microcapsule, carbon black N134 and rubber processing aid. The wear-responsive microcapsule wall material is urea-formaldehyde resin, and the core material contains high-viscosity alkyl benzene synthetic oil and titanate coupling agent. The preparation method includes: preparing Ti3C2T x MXene nanosheet and performing double surface modification; preparing microcapsules; uniformly mixing by adopting three-stage mixing process, and obtaining by vulcanization. The application realizes the self-compensation effect of boundary lubrication and in-situ interface hybridization under wear conditions through the synergistic effect of Ti3C2T x MXene and microcapsule, significantly improves the wear resistance and slows down the performance decay, while having good mechanical properties and process adaptability.

This invention discloses a high specific surface area mesoporous tin oxide powder and its preparation method. The method includes: dissolving a tin source in a mixed solvent of alcohol and deionized water, adding a ketone complexing agent and a nonionic dispersant, and stirring to form a tin-based complex precursor solution; then transferring the solution to a hydrothermal reactor for hydrothermal aging treatment, causing the precursor solution to hydrolyze and condense, forming gel particles in situ; after solid-liquid separation, washing with alternating anhydrous ethanol and dilute ammonia water, and drying to obtain the precursor powder; finally, performing staged heating calcination under an air-nitrogen mixed atmosphere, first removing organic components at low temperature, and then completing the crystal phase transformation at high temperature to obtain rutile phase SnO2 powder. The powder has an average particle size of 8–15 nm and a specific surface area of ​​85–110 m² / g. 2 The powder has a pergola size of 3–6 nm and good dispersibility. This invention effectively suppresses grain agglomeration through complexation regulation, hydrothermal-sol-gel coupling, and gradient atmosphere calcination. The prepared powder is suitable for applications such as gas sensors, lithium-ion battery anodes, or transparent conductive films.

The present invention provides a system and method for preparing polyamic acid by continuous polymerization. The system for preparing polyamic acid by continuous polymerization provided by the present application controls the flow rate of the first part of dianhydride solution by a dianhydride feed controller A so that the diamine solution and the first part of dianhydride solution are mixed and then subjected to a first prepolymerization reaction in a first microchannel reactor to obtain a first prepolymer; then the flow rate of the second part of dianhydride solution is controlled by a dianhydride feed controller B so that the first prepolymer and the second part of dianhydride solution are mixed and then subjected to a second prepolymerization reaction in a second microchannel reactor to obtain a second prepolymer; finally, the flow rate of the remaining dianhydride solution is controlled by a dianhydride feed controller C so that the remaining dianhydride solution and the second prepolymer are mixed and then subjected to a final polymerization reaction in a twin-screw reactor, and the feeding molar ratio of diamine and dianhydride monomers can be controlled to be close to 1:1, and a polyamide with high molecular weight, narrow distribution and ultra-high viscosity is obtained, and no pipeline blockage is caused.

The invention belongs to the technical field of epoxy resin production, and particularly relates to a preparation method and application of low-chlorine epoxy resin. The method comprises the following steps: carrying out n times of dechlorination on an epoxy resin organic phase solution, and standing and layering the obtained final dechlorination solution to obtain a final dechlorination organic phase solution; and adjusting the pH value of the final dechlorination organic phase solution to 6-7, and removing the solvent from the obtained neutralized dechlorination organic phase solution to obtain the low-chlorine epoxy resin. According to the method, potassium hydroxide is adopted as an active component of the dechlorination reagent, meanwhile, the dosage of potassium hydroxide is controlled, the dechlorination temperature is larger than or equal to 80 DEG C, potassium hydroxide is used for rapid reaction dechlorination under the action of the phase transfer catalyst, and chloride ions in epoxy resin can be effectively removed. According to the method, the total chlorine content in the low-chlorine epoxy resin product can be effectively controlled through multiple times of chlorine removal operation, controllable adjustment of product indexes is achieved, it is guaranteed that the finally obtained product is good in batch stability, light in color and luster and low in total chlorine content, and the application requirement of photoresist can be met.

The invention discloses a method for preparing bisphenol A polyether, characterized in that a liquid coordinated alkaline earth metal catalyst and bisphenol A are placed in a reaction kettle, nitrogen is replaced, an epoxy compound introduced at an initial feed temperature is stirred, and then the temperature is raised to a reaction temperature and the remaining epoxy compound is introduced to continue to react to generate bisphenol A polyether. The invention uses a liquid coordinated alkaline earth metal catalyst, which has good solubility for bisphenol A, reacts rapidly to a liquid state at low temperature, accelerates mass transfer, improves reaction efficiency, and the obtained product has few impurities, does not require post-processing, and saves costs.

The application provides a modified PCR ABS material for table tennis shells and a preparation method thereof, which comprises the following components in parts by mass: low-flow PCR ABS resin: 30-40 parts, high-flow PCR ABS resin: 20-30 parts, large-particle-size ABS rubber powder: 10-15 parts, small-particle-size ABS rubber powder: 3-5 parts, SAN blend: 8-15 parts, and ABS new material: 0-20 parts; the low-flow PCR ABS resin has a melt index of 10-15 g / 10 min (220 DEG C x 10 kg); the high-flow PCR ABS resin has a melt index of 20-25 g / 10 min (220 DEG C x 10 kg); the large-particle-size ABS rubber powder has a particle size of 350-400 nm; and the small-particle-size ABS rubber powder has a particle size of 50-150 nm.

The invention discloses a high-resolution capillary electrophoresis screening medium. The high-resolution capillary electrophoresis screening medium is prepared by mixing a screening polymer and a self-coating viscosity adjusting polymer, wherein the screening polymer is linear polyacrylamide, the molecular weight Mn of the linear polyacrylamide is 1.4 to 1.5 MDa, and the PDI of the linear polyacrylamide is 1.5 to 2.0; the self-coating viscosity adjusting polymer is a mixture of a plurality of linear poly N, N-dimethylacrylamide with different molecular weights, the molecular weight Mn of the self-coating viscosity adjusting polymer is 340 kDa to 360 kDa, and the PDI is 3.8 to 4.2. The prepared screening medium is high in resolution ratio, good in stability and accurate in typing.

The invention discloses a polybenzimidazole / polyionic liquid / heteropolyacid imidazole composite ion membrane with high ion selectivity, a preparation method and application thereof, and belongs to the technical field of ion membranes. The polyionic liquid used in the invention is a type of ionic liquid polymer having anionic and cationic groups on a repeating unit, which has the excellent properties of both ionic liquids and polymers. The ion membrane obtained by blending with polybenzimidazole has high conductivity, good mechanical strength, and excellent chemical stability. At the same time, in order to further improve the conductivity of the ion membrane, an imidazole salt of an oxygen-containing polyacid (heteropolyacid imidazole salt) is added to form a composite ion membrane. In addition, the preparation method of the invention is simple in process, and the composite ion membrane obtained has high ion selectivity and stability, high mechanical strength, and still maintains high proton conductivity at high temperatures.

The present application provides a kind of polypeptide sustained-release hydrogel coating for preventing catheter urinary tract infection and its preparation method, the coating includes the adhesive bottom layer attached to the surface of catheter substrate, and the polypeptide sustained-release hydrogel functional layer compounded outside the adhesive bottom layer;The functional layer includes hydrophilic hydrogel gel-forming matrix, targeted antibacterial polypeptide, polypeptide sustained-release carrier and biocompatible auxiliary agent.The present application solves the interface bonding problem of hydrophobic catheter substrate and hydrophilic hydrogel through the adhesive bottom layer, the coating has strong adhesion, is resistant to urine immersion and rubbing;Through polypeptide sustained-release carrier, antibacterial polypeptide is released for 30 days, and there is no risk of burst release;The targeted antibacterial polypeptide used is specific to urinary tract infection pathogenic bacteria, has no drug resistance induction risk, has excellent biocompatibility, can effectively prevent catheter-related urinary tract infection caused by short-term and long-term indwelling catheter, the preparation process is simple and controllable, is suitable for large-scale production, and can be widely applied to antibacterial modification of urinary intervention medical devices.

The invention relates to the technical field of temperature-sensitive liquid crystal membranes, and discloses a temperature-sensitive liquid crystal microcapsule based on a microfluidic technology, a preparation method of the temperature-sensitive liquid crystal microcapsule and a temperature-sensitive liquid crystal membrane.The preparation method of the temperature-sensitive liquid crystal microcapsule comprises the steps that a continuous phase, an intermediate phase and a dispersed phase are prepared, and the flow velocity of three-phase fluid is controlled through microfluidics, therefore, the flow of each phase of liquid in the glass chip is controlled, the purpose of controlling the particle size of the temperature-sensitive liquid crystal microcapsule is achieved, meanwhile, the temperature-sensitive liquid crystal microcapsule prepared by adopting a micro-fluidic technology is high in encapsulation efficiency, small in loss, short in reaction time and good in batch stability, and a temperature-sensitive liquid crystal film prepared by utilizing the temperature-sensitive liquid crystal microcapsule is free of granular sensation, uniform in color development and good in stability. The color developing effect is good.

The application discloses a mink-derived Pediococcus acidilactici, a postbiotic thereof and application, and belongs to the field of microbial technology and animal nutrition. The Pediococcus acidilactici is preserved in the China General Microbiological Culture Collection Center, and the preservation number is CGMCC No. 33419. The strain is homologous to mink, and has excellent in-vitro probiotic characteristics. The strain is used as a probiotic additive in mink feed, and can significantly improve the growth performance of mink. The postbiotic prepared by wet heat treatment of the strain liquid at 110-130 DEG C for 10-20 min is added into the mink feed at an amount of 0.05%-0.15%, and can significantly improve the growth performance of male and female mink. The postbiotic preparation process is simple, low in cost, and suitable for large-scale application.

This invention relates to the field of polymer materials technology, specifically disclosing a halogen-free flame-retardant unsaturated polyester resin material for energy storage battery casings and its preparation method. The halogen-free flame-retardant unsaturated polyester resin material for energy storage battery casings comprises the following components by weight: 35-45 parts unsaturated dicarboxylic acid, 15-30 parts polymeric polyol, 15-25 parts small molecule diol, 35-45 parts styrene, 15-25 parts phosphorus-nitrogen-silicon modified aluminum hydroxide, 8-15 parts organic phosphinate, 0.5-2 parts organometallic catalyst, 0.01-1 part polymerization inhibitor, and 1.2-2.0 parts curing agent. The phosphorus-nitrogen-silicon modified aluminum hydroxide and organic phosphinate are compounded to construct a synergistic halogen-free flame-retardant system. The two work synergistically to improve the flame-retardant effect under halogen-free conditions, while simultaneously suppressing smoke, meeting the fire safety requirements of energy storage battery casings.

The present invention relates to the technical field of lithium ion battery positive electrode material preparation, and in particular to a spherical lithium iron manganese phosphate nanoparticle and a preparation method thereof, wherein the preparation method comprises the following steps: (1) adding a mixed solution of a lithium source and a phosphorus source into a reactor, repeatedly evacuating and filling with nitrogen to exhaust air, adding a mixed solution of a pure iron source and a manganese source, adjusting the pH value of the reaction system, sealing the reactor for reaction, cooling, filtering and washing the reaction product to obtain a first precursor; (2) mixing the first precursor with a phosphorus source and a lithium source to adjust the element ratio, then mixing with a carbon source, grinding and drying the mixture to obtain a second precursor; (3) roasting the second precursor under nitrogen protection to obtain spherical lithium iron manganese phosphate nanoparticles. The preparation method of the present invention has mild operating conditions, no high-pressure operating unit, simple and controllable process, regular shape of the obtained material and relatively uniform particles, and further improved rate performance and low temperature performance.

The invention provides a titanium composite catalyst and a preparation method and application thereof.The titanium composite catalyst comprises a modified catalyst solution A and a modified catalyst solution B. The modified catalyst solution A comprises a coordination complex formed by an organic titanium compound and a ligand C, the modified catalyst solution B comprises a coordination complex formed by an organic titanium compound and a ligand D, the ligand C is an alcohol amine compound, and the ligand D is a polyhydroxy alcohol compound. The titanium composite catalyst is used for synthesizing the high-viscosity polyether ester elastomer, a segmented catalysis mode is adopted, the modified catalyst solution A is used for catalyzing the reaction in the esterification stage, and the modified catalyst solution B is used for catalyzing the reaction in the polycondensation stage, so that catalyst hydrolysis is avoided in the esterification stage, and high activity is provided in the polycondensation stage; and finally, synthesizing the high-viscosity polyether ester elastomer within a relatively short synthesis time.

This invention relates to the field of plant extract preparation technology, and particularly to a low-oxalic acid, high-activity fresh purslane extract, its preparation method, and its applications. This invention uses freshly harvested purslane as raw material. Except for washing, the entire process of pulverization, enzymatic hydrolysis, filtration, and concentration does not require additional process water, directly producing a raw homogenate. After acidification, enzymatic hydrolysis with compound enzymes, enzyme inactivation, filtration, pressing, and oxalic acid removal, the extract is obtained through low-temperature vacuum oxygen-free concentration. This invention requires no organic solvents and can efficiently retain the total flavonoids, total polysaccharides, and phenolic acid active ingredients. The resulting extract contains ≥1.0% total flavonoids, ≥5.0% total polysaccharides, ≥30% solids, and ≤0.05% oxalic acid. This invention solves the problems of activity loss, dilution with added water, oxalic acid irritation, large oxidation losses, and unstable industrialization associated with traditional processes. The process is gentle and can be automated for mass production, making it suitable for cosmetics, personal care products, food, and functional foods.