268results about How to "Control reaction speed" patented technology

The invention discloses a high-nickel single-crystal ternary cathode material with low surface residual alkali content and a preparation method thereof. The preparation method comprises the followingsteps: weighing lithium hydroxide, an oxide additive and a nickel-cobalt-manganese ternary precursor, and carrying out uniform mixing through a dry high-speed mixing process so as to prepare a mixed material; subjecting the mixed material to first sintering so as to obtain a first sintered material; crushing the first sintered material, and carrying out sieving so as to obtain a first crushed material; weighing the first crushed material, a coating agent and deionized water, and carrying out water washing under stirring so as to prepare a slurry, wherein the coating agent comprises an elementX which is one or more selected from the group consisting of B, Al, Ba, Zr, Mg, Ca, Ti, Si, V, Sc, Nb, Ta and Z; drying the slurry under a vacuum condition through a dynamic rotary drying process so as to obtain a dry material; subjecting the dry material to secondary sintering so as to obtain a secondary sintered material; and crushing the secondary sintered material, and carrying out sieving soas to obtain a product. The high-nickel single-crystal ternary cathode material and the preparation method thereof provided by the invention has the following advantages: alkali reduction by water washing and in-situ coating by a wet process can be synchronously completed; the process is simple; high compaction density is realized; and the content of residual alkali is low.

The invention relates to an additive used for monocrystalline silicon wafer alkaline flocking and an application method thereof, belonging to the technical field of solar batteries. The additive is prepared by the following components: ethanolamine, polyphosphate, sodium dodecylbenzene sulfonate, sodium hydroxide and water. A flocking agent is prepared through the following steps: (1) dissolving sodium hydroxide in deionized water so as to obtain alkaline flocking liquid; (2) adding the additive motioned above into the alkaline flocking liquid to obtain the flocking agent. During flocking, monocrystalline silicon wafers used for solar batteries are immersed in the flocking agent with temperature controlled to be 75 to 85 DEG C and flocking time controlled to be 15 to 18 minutes. The additive used for monocrystalline silicon wafer alkaline flocking in the invention enables flocking reaction time to be shortened and productivity to be enhanced; prepared texture surface pyramids have a uniform size and low reflectivity; the additive is applicable to solar battery silicon wafer alkaline flocking of different specifications and meets the purpose of industrial production.

The invention relates to a synthesizing method of inorganic perovskite nanosheets. The method includes: adding the precursor solution of cesium into the precursor solution of lead halide, performing ultrasonic treatment for 10-30 minutes to obtain a mixed solution, transferring the mixed solution into a reaction kettle, performing reaction under 60-150 DEG C for 30-420 minutes, and naturally cooling to obtain reactants; performing centrifugal processing and washing to obtain the inorganic perovskite CsPbX3 nanosheets. The method has the advantages that the method is simple to operate and does not need harsh experiment conditions, and the prepared nanosheets are uniform in size, high in controllability and high in yield, and the quantum efficiency of the nanosheets reaches up to 48%.

The invention relates to an initiator composition used for synthesizing polyacrylamide capable of displacing oil, which mainly solves the problems of low polyacrylamide molecular weight, poor heat resistance and salt resistance performances and difficult satisfaction for technical requirement of tertiary oil extraction. The initiator composition used for synthesizing polyacrylamide capable of displacing oil comprises the following ingredients by weight percentage: (a) 0.5-20% of persulfate; (b) 0.1-40% of sulfite or acid sulfite; (c) 0.5-20% of NR1R2R3-represented trialkylamine compounds or N<+>R4R5R6R7-represented quaternary ammonium compounds or NH2R8-represented aliphatic amine compounds, wherein R1-R7 in the formula are selected from C1-C14 straight chain or branched chain alkyl or alkyl derivatives, R8 is selected from straight chain or branched chain alkyl or alkyl derivatives; (d) 10-80% of urea, thiourea or ammonia liquor; (e) 5-60% of ethylenediaminetetraacetic acid. The technical scheme of the invention better solves the problems and can be used in industrial production of oil displacement.

The embodiment of the invention relates to the field of immunodetection, in particular to a human serum amyloid protein A determination kit with high sensitivity and a wide detection range. The humanserum amyloid protein A determination kit comprises a reagent 1, a reagent 2 and SAA calibrators with different concentration gradients, wherein the reagent 2 comprises carboxylated latex microspheresonly labeled with human SAA monoclonal antibodies and carboxylated latex microspheres only labeled with human SAA polyclonal antibodies; the average particle size of the carboxylated latex microspheres only labeled with the human SAA monoclonal antibodies is larger than the average particle size of the carboxylated latex microspheres only labeled with the human SAA polyclonal antibodies. The kitcan be used for detecting a single sample within 10 minutes; the kit has the advantages that the kit is simple in structure and excellent in precision, accuracy, linearity, interference resistance andother indexes, can well diagnose early inflammation of infectious diseases, can detect the content of SAA in serum and the content of SAA in blood plasma, is very suitable for clinical biochemical analyzers, and greatly facilitates clinical examination.

The invention relates to a high-intensity urea-formaldehyde resin microcapsule. Titanium dioxide or silicon dioxide inorganic nanoparticles with particle diameter of 10 to 50 nm are doped in the wall material of the microcapsule. A preparation method of the high-intensity urea-formaldehyde resin microcapsule comprises the following steps of: mixing urea and formaldehyde according to a molar ratio of the urea to the formaldehyde of 1:1.75; adjusting the pH value to 8.5 to 9.0; stirring at the constant temperature of between 70 and 75 DEG C for 1 hour; diluting by adding distilled water to obtain urea-formaldehyde prepolymer solution with mass concentration of 35 to 60 percent; taking 10 to 20 milliliters of the urea-formaldehyde prepolymer solution and adjusting the pH value to 4.0 to 4.2; reacting at the temperature of between 23 and 26 DEG C for 1 hour to obtain water-soluble urea-formaldehyde resin; dispersing the inorganic nanoparticles into an oil phase to prepare 0.04 to 0.2 mass percent of inorganic particle dispersion liquid; adding 40 milliliters of 7.3 mass percent of deionized water solution of a system modifier into the water-soluble urea-formaldehyde resin; adding 4.5 milliliters of inorganic particle dispersion liquid dropwise under stirring to form emulsion and then adjusting the pH value to 3.0 to 3.5; reacting at the temperature of between 23 and 26 DEG C for 1 hour; adding 0.3 to 3 grams of curing agent; heating the product to 45 to 50 DEG C; performing heat-preserving reaction for 2 hours; and performing suction-filtration and drying to obtain the urea-formaldehyde resin microcapsule, of which the wall material is doped with the inorganic nanoparticles.

The present invention relates to the technical field of food additives and particularly relates to a microcapsule embedded leavening agent and a preparation method thereof. The microcapsule embedded leavening agent comprises wall materials at a weight percentage of 30%-80% and preservative core materials at a weight percentage of 20%-70%. The core materials of the leavening agent are embedded with the wall materials; the wall materials are at least one of distilled glyceryl monostearate, hydrogenated vegetable oil, diacetyl tartaric acid monoglyceride or diglyceride, polyglycerol fatty acid esters, sodium stearoyl lactate, phospholipids and beeswax; and the core materials of the leavening agent are at least one of sodium bicarbonate, dihydrogen disodium pyrophosphate, calcium hydrophosphate and calcium carbonate. The microcapsule embedded leavening agent is good in use effects, can control the speed of the reaction of the leavening agent, is conductive to releasing in the subsequent baking process, and thereby grants baked food fluffy volume and soft quality.

The invention belongs to the technical field of chemical engineering and provides a hydrogen production reaction with the controllable hydrogen production speed to solve the problem that the hydrogen production rate is affected due to different degrees of alkalinity in a traditional aluminum water hydrogen production method and the problem that manual control cannot be achieved due to the high hydrogen production speed generated when PH is too high.The hydrogen production reaction includes the process that a hydrogen production agent generates a hydrolysis reaction under the effect of a solid catalyst.The alkaline solid catalyst is added in the process of mixed hydrogen production of a hydrogen-from-aluminum agent and a sustained-release agent, the hydrogen production rate and time period can be effectively controlled, and hydrogen is generated at a uniform speed for use.

The invention discloses a method for synthesizing in-situ formed ceramic particle reinforced iron-aluminum-based composites by laser combustion, belonging to the technical field of materials. The in-situ formed ceramic particle reinforced iron-aluminum-based composites are prepared by the following steps of: putting tungsten ore powder, iron powder, aluminum powder and carbon powder in a ball mill for milling to obtain a mixed powder material; and compressing the mixed powder material into a pressed compact, transmitting a high-energy laser beam by employing a CO2 laser processing machine to ignite the surface of the pressed compact and trigger self-propagating high temperature synthesis of the pressed compact. By the invention, two ceramic particle reinforced phases are simultaneously formed on one substrate, which shortens the preparation process of the composites, lowers material manufacture cost and facilitates large-scale production and application.

The invention discloses a nano-iron powder fuel power generation method and device. According to the scheme, nano-iron powder serves as fuel; the nano-iron powder and oxygen are mixed and ignited, and generated thermal energy is converted onto electric energy to realized power generation; hydrogen is introduced into a combustion product Fe3O4 for hydrogen reduction of Fe3O4, and recovery of the combustion product is realized. The nano-iron powder power generation method and device are high in thermal efficiency, friendly to environment, free of pollution, reusable, energy-saving, safe, reliable, low in cost and capable of replacing existing no-renewable energy resources and has great development prospects.

The invention discloses a modified composite bismaleimide resin prepolymer, which is a prepolymer prepared from composite bismaleimide resin and a propenyl phenoxyl compound. The weight ratio of the composite bismaleimide resin to the propenyl phenoxyl compound is 100:50-120. In the invention, some special bismaleimide structures are employed for composition, wherein the structures can control reaction speed due to a steric effect, so that the bismaleimide can be completely hot-melted and reacted with the propenyl phenoxyl compound. The technology solves a problem that a reaction on the bismaleimide in the prior art cannot be controlled and other processing problems are also solved.

The invention discloses a phosphate laser glass surface enhancement processing method. The phosphate laser glass surface enhancement processing method comprises following steps: mixed acid is used for immersion erosion of phosphate laser glass; and then mixed alkali is used for surface removing of phosphate laser glass. The phosphate laser glass surface enhancement processing method is not limited by the shape of samples to be processed. The phosphate laser glass surface enhancement processing method is capable of removing micro-cracks and impurity particles on the surface of phosphate laser glass to a maximum degree, reducing surface roughness of phosphate laser glass after fine grinding, providing phosphate laser glass with higher microhardness and rupture strength, increasing repetition frequency and thermal damage threshold of phosphate laser glass under flashlamp pumped greatly, and increasing laser gain of phosphate laser glass via reducing scattering on incident light.

The invention relates to a preparation method of blue nanometer tin indium oxide powder. The preparation method comprises the following steps: (1) adopting a weakly alkaline precipitant for titrating an indium and tin compound aqueous solution and enabling the indium and tin compound aqueous solution to uniformly precipitate; (2) washing an ITO precursor with water for three times, washing with alcohol for two times, drying, then grinding, putting in a crucible, feeding in a muffle furnace, and carrying out calcination treatment to obtain yellow ITO; and (3) adding the yellow powder obtained by calcination to ethylene alcohol, carrying out emulsification dispersion, feeding into a high-pressure autoclave, carrying out thermal treatment, centrifuging so as to obtain ITO precipitates, washing with alcohol, and drying so as to obtain the blue ITO powder. The preparation method has the advantages that the weakly alkaline precipitant is used for reaction, and the reaction speed is controlled, so that the obtained precursor is relatively fine; and the protective gas sintering is avoided, required equipment is simple, and the powder does not need to be made thinner.

The invention provides a method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding, which comprises three feeding processes and comprises the following specific steps: in the first feeding process, preparing a degumming solution from surfactant, a fiber expanding agent, peroxide stabilizer, a defoaming agent, sodium hydroxide, peroxide and water, mixing raw hemp of ramie and the degumming solution to form a degumming solution system, and heating to remove part of colloid; in the second feeding process 20-50 minutes later, adding peroxide and sodium hydroxide, and keeping the temperature to further remove the colloid; in the third feeding process 20-50 minutes later, adding peroxide, and further keeping the temperature until the reaction is finished and the colloid is completely removed; and finally, washing refined dried hemp fibers with clear water, oiling, drying, opening, and combing to obtain the prepared ramie fibers. The method provided by the invention overcomes the defects in the existing oxidation and degumming technology; a repeated multiple-step method is used, so that the reaction is uniform and moderate, the damage to the fibers caused by over too high initial concentration of initial concentration is reduced, and the quality of the refined dried hemp product is improved; and meanwhile, the ineffective decomposition of the peroxide and the consumption of the defoaming agent are reduced, thereby saving the cost.

The embodiments of the invention relate to the field of immunoassay, and in particular to a human heparin binding protein assay kit with high sensitivity and wide detection range. The human heparin binding protein assay kit comprises: a reagent 1, a reagent 2 and human HBP calibrators with different concentration gradients. The reagent 2 comprises a carboxyl latex microsphere labeled only with human HBP monoclonal antibody and a carboxyl latex microsphere labeled only with human HBP polyclonal antibody. The average particle diameter of the carboxyl latex microsphere labeled only with the humanHBP monoclonal antibody > the average particle diameter of the carboxyl latex microsphere labeled only with the human HBP polyclonal antibody. The human heparin binding protein assay kit provided bythe invention can complete a single sample test within 10 minutes, and indexes of precision, accuracy and anti-interference are excellent. The invention can be used clinically to predict an organ dysfunction caused by sepsis, and can be used as an early diagnostic marker for sepsis, especially serious bacterial infection.

The invention relates to a polyacrylic imide foam material prepared by an esterquat precursor, and a preparation method and application of the polyacrylic imide foam material. In a preparation process of polyacrylic imide foam prepolymer, the esterquat precursor of PMR type polyimide is added, endothermic reaction of amidation of the esterquat precursor is matched with exothermic reaction of free radical polymerization in the preparation process of the polyacrylic imide foam prepolymer, and the purpose of effectively controlling reaction speed of polyacrylic imide is achieved. The prepared polyacrylic imide foam material has the advantages of high closed porosity, good high-temperature resistance and high compression resistance. The density of prepared foam is 30-250kg/m (3), closed porosity is greater than 90%, and a glass transition temperature is greater than 220 DEG C. At a room temperature, the density of the prepared foam is greater than 110kg/m (3), and compression strength of the foam is greater than 3.0MPa; and at a high temperature of 180 DEG C and under pressure of 0.3MPa, the compression deformation rate of the foam of which the density is 110kg/m (3) is lower than 1% after the foam is technologically treated for 2 hours.

The invention provides a wear-resistant steel-bonded hard alloy composite hammer head and a manufacturing method thereof. The manufacturing method comprises the following steps of: step (1). blendingtitanium powder, graphite powder, additional hard particles and additives, adding a water-based binder, mixing uniformly, and making the mixture into alloy powder paste or stamping the mixture to forma preform; step (2). pasting the alloy powder paste or fixing the dried preform to the lost foam model of the hammer face of the hammer head, then coating anti-sticking sand fireproof paint, drying,burying in a box, and performing dry sand vibration modeling; and step (3). pouring high-toughness austenitic manganese steel or low-carbon alloy steel melt, using high-temperature molten steel to induce the combustion reaction between titanium and carbon in the alloy powder paste or preform, wherein TiC particles are generated in situ, and the high-temperature molten steel penetrates into an alloy particle layer, and interacts with additional TiC, WC, Al2O3 and other alloy powder particles; and performing cooling and cleaning, then performing heat treatment, and thus, the high-toughness and high-hardness wear-resistant steel-bonded hard alloy composite hammer head is manufactured.