92results about How to "Avoid violent reactions" patented technology

The invention provides a metal matrix composite material, which uses metal as a matrix and uses graphene modified on the surface of carbide as a reinforcement. Due to the surface modification of the carbide, the interface bonding strength between the metal matrix and the graphene can be adjusted. For example, when the chemical affinity between graphene and the metal matrix is ​​too strong and an excessive reaction occurs, resulting in an excessively strong interface bond, the carbide can be used as a diffusion barrier to avoid the overreaction and weaken the interface bond; When the interfacial affinity is weak, the carbide can be used as a transition layer to promote interfacial wetting and improve interfacial bonding force.

The invention belongs to the field of airplane aeroelasticity tests, and relates to an airplane ground test scope, in particular to an automatic amplitude modulation frequency scanning method for an airplane servo elasticity frequency response test. Control plane overloads are fed back to automatically adjust a frequency scanning amplitude value, on the premise that safety of a control pane structure is guaranteed, control plane deflection exciting force of all frequency scanning points is kept maximum so that sufficiently large airplane structure response can be excited, the signal to noise ratio of a response signal of an airplane-flight control combined circuit is improved, test errors are reduced, and reliability of a test result is improved. Meanwhile, the adjusting process of an excitation signal amplitude value is controlled through construction of a hyperbolic tangent-exponent function, violent response of a control plane caused by sudden changes of the excitation signal amplitude value is prevented from happening in the process of frequency scanning, and safety of the control plane structure is ensured. In addition, the advantages of a real-time simulation system of a computer are brought into full play, in the process of the test, people only need to slightly click a mouse, so that parameters such as control limit overloads and excitation signal cycles can be adjusted, and the automatic amplitude modulation frequency scanning method is high in practicability.

The invention discloses a method and device for marking plant carbon isotopes. The method comprises following steps: sowing seed in the cultivating disk which located in the soil; putting cultivating disk into air- tight box; adding sodium carbonate marked with carbon-14 or carbon- 13 under air- tight condition, carrying out reaction with hydrochloric acid in reaction tank to generate carbon dioxide for plant photosynthesis. The carbon dioxide in box is mixed with electrical fan, and light is replenished with daylight lamp, the temperature and humidity are reduced by using cooling tube, and water is added into cultivating disk with fluid infusion bottle. The plant marked with carbon- 13 or carbon- 14 is got after cultivation. The invention is characterized by simple and safe operation, prevention of carbon marked with carbon isotopes escape, increased utilization coefficient of carbon isotopes, suitability for carbon isotopes mark for various plants, especially for woody plant.

The invention provides a preparation method of a metal resin complex and the metal resin complex prepared thereby. The preparation method of the metal resin complex comprises the following steps: S1, anodic oxidation: a metal substrate with a surface comprising an anodic oxidation film layer is obtained by anodic oxidation of a pretreated metal substrate, and the metal substrate is an aluminum alloy substrate or aluminum substrate; S2, treatment with phosphoric acid: the metal substrate containing the anodic oxidation film layer and obtained by the step S1 is immersed in a phosphoric acid solution for treatment to obtain a surface treated metal substrate; and S3, injection: the surface of the surface treated metal substrate is injected with a resin composition, and then the metal resin complex is obtained after molding. In the metal resin complex, the binding force between metal and resin is strong, and the process is simple, is easy for large-scale production, and has no pollution.

The invention relates to a lithium secondary cell isolation film, at least including a strong water absorption material-high molecular composite layer, where the preferred strong water absorption material is molecular sieve. The strong water absorption material can completely absorb the residual and infiltration water in manufacturing process of the lithium secondary cell so as to prevent the poisoning of the lithium secondary cell or the reaction of lithium metal with the water, thus prolonging the service life. In addition, the proper combination of the strong water absorption material with the high-molecular composite can increase the mechanical strength of the isolation film and reduce the electrode penetration and thus it improves the safety of the lithium secondary cell. The invention also relates to a lithium secondary cell using this isolation film.

The invention relates to silicon nitride and a preparation method thereof. The preparation method of the silicon nitride comprises the following steps: performing gas atomization treatment on siliconparticles by using nitrogen to obtain silicon powder subjected to gas atomization; continuously nitrogen under the plasma state and the silicon powder subjected to gas atomization into a reactor, maintaining the temperature of the reactor to 1300 to 1450 DEG C, performing solid and gas separation and retaining solid; and adding alpha-phase silicon nitride, ammonium fluoride and ammonium iodide into the solid, mixing uniformly, vacuumizing, introducing mixed gas of nitrogen and hydrogen until the pressure is increased to the gauge pressure of 0.005 to 0.05 MPa, heating to 1200 to 1250 DEG C, continuously introducing the mixed gas of nitrogen and hydrogen until the pressure is increased to the gauge pressure of 0.01 to 0.1 MPa, maintaining the reaction time for 5 to 10 hours, and cooling after complete reaction to obtain the silicon nitride. The preparation method of the silicon nitride is a composite synthesis method. By the preparation method of the silicon nitride, high alpha-phase silicon nitride can be obtained.

The invention relates to the field of medicinal chemistry and discloses a preparation and purification method of valsartan. The method comprises the steps of (S1) adding L-valine and alcohol to a reaction kettle, slowly dropwise adding thionyl chloride, carrying out heating reflux reaction, adding isopropyl acetate for pulping, carrying out suction filtration to obtain an intermediate 1; (S2) carrying out nucleophilic reaction on the intermediate 1 and a starting material 2 in a solvent under an alkaline condition to obtain an intermediate 2; (S3) carrying out nucleophilic reaction on the intermediate 2 and valeryl chloride in the solvent under the alkaline condition to obtain an intermediate 3; and (S4) carrying out cyclization reaction on the intermediate 3, sodium azide and a catalyst ((-)-sparteine-Cu (II) complex) in the solvent, washing, crystallizing and drying to obtain the valsartan. The sodium azide and the catalyst ((-)-sparteine-Cu (II) complex) are used in the cyclization reaction, and the cyclization yield can reach 90%. According to the purification method, the purity of the raw materials of the valsartan is greater than 99.99%, the content of a solvent residue (ethyl acetate) is smaller than 0.5%, the content of a specific impurity is smaller than 0.1%, other unknown individual impurities are avoided and an enantiomer impurity is not detected.

The invention provides a secondary doped silicon-based negative electrode material and a preparation method thereof, the secondary doped silicon-based negative electrode material comprises an inner core and a carbon coating layer; the inner core comprises silicon, a silicon oxide, silicate of a first metal element and silicate of a second metal element, the general formula of the silicon oxide is SiOx, x is greater than 0 and less than 2; the activity of the first metal element is lower than that of the second metal element; and the carbon coating layer is coated on the surface of the inner core. According to the secondary doped silicon-based negative electrode material and the preparation method of the secondary doped silicon-based negative electrode material, the first coulombic efficiency and the capacity retention ratio of a secondary battery can be improved.

The invention provides a production method for co-production of acetyl chloride by 1-hydroxyethylidene-1,1-diphosphonicacid. The method comprises the following steps: starting a reaction still for stirring, pumping a certain amount of acetic acid or acetic acid aqueous solution in, and meanwhile dripping a certain amount of phosphorus trichloride into the reaction still for mixing; after mixing, leading into a heat exchanger for preheating; preheating a mixed material, leading into a synthesis reactor for an esterification reaction, enabling generated acetyl chloride to enter into a rectifying tower to be separated to obtain high-purity acetyl chloride or back drop into the synthesis reactor, enabling hydrochloric acid and uncondensed acetyl chloride to enter a multi-stage exhaust absorption apparatus; enabling generated acetic ester to enter a hydrolysis kettle for hydrolyzation, promoting acetic ester to evaporate out by negative pressure operation to be reused, replenishing deionized water to promote the hydrolyzation to obtain HEDP, and reusing excess heat through a steam recycling machine on the heat exchanger. The production method has the following beneficial effects: the production efficiency is promoted; the operative difficulty and labor intensity are reduced; the technical parameter requirements on the synthesis reactor can be lowered; the reaction efficiency can be greatly improved; product overstocking caused by acetyl chloride encountering poor sales is avoided; the production cost is saved; the exhaust emission is reduced.

The invention discloses an asphalt polyurethane waterproof coating suitable for a cement base layer and a preparation method and application of the asphalt polyurethane waterproof coating. Raw materials of the asphalt polyurethane waterproof coating comprise asphalt, a compatilizer, a water removal agent, a catalyst, filler and a terminated polyurethane prepolymer, wherein the terminated polyurethane prepolymer is prepared through a reaction of a compound which is shown in a formula (I) and a polyurethane prepolymer, and the terminated polyurethane prepolymer contains no isocyanate-terminatedgroups; and the preparation method comprises the following steps: preparing the terminated polyurethane prepolymer firstly, and then mixing the terminated polyurethane prepolymer with the remaining raw materials so as to obtain the coating. The invention further discloses application of the waterproof coating in construction of an asphalt waterproof coiled material on the cement base layer. The waterproof coating has a safe preparation process, the coating can be coated directly on the cement base layer with high content of water when the coating is in use, and a reaction is performed betweenthe hydrolyzed coating with silicate in the cement, so that the bonding force on the wet base layer is improved; and excellent bonding strength can be formed between the coating and the asphalt waterproof coiled material, particularly a short time of surface drying and hard drying and moderate viscosity are achieved, the heating step before construction can be avoided basically, and on-site construction is facilitated.

The invention provides a preparation method and a preparation system for sodium dihydrogen citrate. The preparation method comprises the following steps: taking sodium citrate and citric acid as reaction raw materials, successively passing the raw materials through a neutralization tank for a neutral reaction, adjusting a pH value to 2.6 to 2.8 and filtering; enabling filtrate to enter a concentrating tank, keeping the temperature of the concentrating tank at 60 to 80 DEG C and carrying out crystallization reaction for 5 to 6 hours; after the crystallization reaction ends, carrying out solid-liquid separation by using an automatic centrifuge; enabling a crystal to directly enter a vibrating fluidized bed drier, drying at the temperature of 70 to 80 DEG C for 2 to 3 minutes, and removing surface water to directly obtain the sodium dihydrogen citrate; then crushing with a pulverizer and sieving through a 60-mesh sieve, thus obtaining a finished product. The invention further provides thepreparation system for the sodium dihydrogen citrate prepared according to the preparation method. According to the preparation method and the preparation system for the sodium dihydrogen citrate, disclosed by the invention, the sodium citrate and the citric acid are taken as the reaction raw materials, stable reaction and low heat release are realized; crystallization reaction time and drying time can be shortened, production cost can be reduced and production efficiency is improved.

The invention discloses a salt-resistant polymer microsphere plugging agent and a preparation method thereof. The polymer microsphere plugging agent is prepared from the following raw materials: white oil, fumed silica, an acrylamide monomer, acrylic acid, sorbitan fatty acid ester, N,N-methylene bisacrylamide, ammonium persulfate, sodium hydrogen sulfite, a hydrophilic group surfactant, water and the like. The salt-tolerant polymer microspheres with ultralow interfacial tension are synthesized by adopting an inverse emulsion polymerization method, a prepared polymer microsphere plugging agent is novel polymer microspheres with ultralow interfacial tension, the interfacial tension can reach 4.3*10 <-3> mN/m, the salt tolerance can reach 50000 mg/L of mineralization degree, and the problems that existing polymer microspheres are low in interfacial tension and poor in salt tolerance are solved.

The invention relates to a preparing method of a gemcitabine intermediate, and belongs to the technical field of medicine intermediate synthesis. In order to solve the problems that an existing methodis violent in reaction and not stable in yield, the preparing method of the gemcitabine intermediate is provided. The method includes the steps of adding iodine powder to an organic zinc intermediate-state reaction solution obtained through the reaction of ethyl bromodifluoroacetate and activated zinc powder in a first solvent, adding acetonylidene glyceraldehyde to a second solvent to obtain a corresponding acetonylidene glyceraldehyde solution, synchronous pumping the organic zinc intermediate-state reaction solution and the acetonylidene glyceraldehyde solution into a micro-channel reactorfor a condensation reaction to obtain outflow liquid, and conducting acidification to obtain the corresponding product (gemcitabine intermediate). The problem of the violent reaction can be effectively overcome, and the effects of mild reaction and high product yield are achieved.

The invention provides a surface treatment method of an artificial bone material. The method comprises the following steps: 1, providing the artificial bone material; and 2, sandblasting the artificial bone material, carrying out first acid corrosion treatment on the artificial bone material by using a first acid solution, and carrying out second acid corrosion treatment on the artificial bone material by using a second acid solution, wherein the first acid solution and the second acid solution are two acidic solutions in order to form a plurality of micro-pores on the surface of the artificial bone material. The invention also provides a surface treated artificial bone material.

The invention discloses a cooling device for seamless steel tube production, relates to the technical field of seamless steel tube machining, and aims at solving the problem that an existing cooling device is poor in cooling effect. A shell is arranged over a workbench. A heating water tank is arranged at one side of the upper portion of the shell. A heating rod is mounted in the heating water tank; a temperature sensor is mounted at one end of the heating water tank; a normal-temperature water tank is arranged on one side of the heating water tank; a condensed water tank is arranged on one side of the normal-temperature water tank; an air pump is mounted at one end of the condensed water tank; pressure pumps are mounted at the other sides of the heating water tank, the normal-temperaturewater tank and the condensate water tank; and water collecting discs are arranged under the heating water tank, the normal-temperature water tank and the condensate water tank correspondingly; a transmission mechanism is installed at the upper end of the workbench; a conveying wheel is installed on one side of the transmission mechanism; an electric push rod is installed above the conveying wheel,and a limiting wheel is installed in the installation base.

The invention discloses a core material of magnesium-calcium-aluminum-iron alloy core-spun yarns and application thereof. The core material of the magnesium-calcium-aluminum alloy core-spun yarns is characterized by being composed of, by weight, 6-25% of magnesium, 5-24% of calcium, 5-35% of aluminum and the balance iron and inevitable impurities, wherein the mass ratio of the magnesium to the calcium ranges from 6 to 11 to 18 to 11. In the refining process of molten steel, the core material of the magnesium-calcium-aluminum alloy core-spun yarns is made into the core-spun yarns and added into the molten steel to modify sulfides in sulfur-bearing steel. In the refining process, the core material of the magnesium-calcium-aluminum alloy core-spun yarns is fed to make the core-spun yarns, and therefore the morphology of the sulfides can be effectively adjusted and controlled, and the machinability and the comprehensive property of steel can be improved.

The invention belongs to the technical field of a luggage, and particularly relates to a luggage. The luggage comprises a luggage body; universal wheels and a pulling rod are respectively arranged atboth sides of the luggage body; a handle is arranged at the front side of the luggage body; the upper part of the luggage body is hinged with an upper cover; the luggage body and the upper cover are respectively provided with housings, buffer foam and waterproof layers from outside to inside; a group of pre-fracture grooves are formed on the lateral surface of the luggage body; folded gas bags arearranged at positions inside the housings, which correspond to the pre-fracture grooves; when the gas bags are inflated, the pre-fracture grooves are broken; No.1 cavities are formed at one sides ofthe gas bags, which are away from the housings; the insides of the No.1 cavities are fixedly connected with a reaction chamber; a sodium block is arranged in the reaction chamber; the sodium block issoaked in kerosene in the reaction chamber; the reaction chamber is communicated with the gas bags by air pipes; and the reaction chamber is communicated with a water inlet pipe. According to the invention, water enters the reaction chamber from fractures and reacts with sodium in the reaction chamber to generate hydrogen, the hydrogen is filled into the gas bags, and after the gas bags are completely and fully filled, a swim ring shape is formed and surrounds the luggage, so as to prevent the luggage from being sunk into the water and facilitate finding and salvaging the luggage at the firsttime by a rescuer.