70results about How to "Simple chemical reaction" patented technology

The invention relates to a low-density ablation thermal insulation type composite and a preparation method thereof. The composite adopts phenolic aerogel of the nanometer particle structure as a matrix and adopts a flexible fiber blanket or a fiber weaving body as a reinforcement body, and the composite is obtained through the steps of phenolic resin preparation, phenolic resin solution preparation, thermal treatment of the flexible fiber blanket or the fiber weaving body, steeping of the flexible fiber blanket or the fiber weaving body with the phenolic resin solution, a sol-gel reaction, aging, drying and curing of the composite and the like. Compared with the prior art, the composite is excellent in thermal protective performance, good in mechanical performance, high in designability, simple in preparation technology, low in cost and easy to process and mold, promotes later-period dimensional cutting, meets different thermal protective needs under the medium heat flow and medium and low heat flow environments, and can be applied to manned space flight and deep space detection aircrafts, outer thermal protective layers of various tactic and strategic weapons working for a short time, and inner ablation heat insulation and thermal protective layers of engines, disposable hypersonic vehicles and the like.

The invention provides a method for preparing zinc oxide/titanic oxide composite self-assembled thin film air-sensitive device, which includes the following steps: first performing a special treatment of the substrate, and then the substrate has electric charges, then dipping the substrate into a ZnO2 sol with positive electrical charges, TiO2 sol with positive electrical charges and polyelectrolyte solution with negative charges in [(ZnO/PSS)/(TiO2/PSS)]n sequence respectively, cleaning the substrate with deionized water after the substrate is fetched from the solution or sol every time, drying the substrate with argon gas or nitrogen. Under the action of the electrostatic gravitational force, the ZnO2 sol grain, the TiO2 sol grain and the polyelectrolyte are adsorbed on the surface of the substrate layer by layer, the process is repeated seriously, the ZnO2/TiO2 composite self-assembled air-sensitive thin films with various thicknesses are made. Then, a ZnO/TiO2 composite self-assembled grain air-sensitive thin film is obtained by heat treating. The method has simple technique, the substrate shape has no special requirements, and the thickness of the film is controlled in the molecule level, the film-forming has good repeatability. The obtained ZnO/TiO2 composite self-assembled grain air-sensitive thin film can be used for the preparation of the gas-sensitive sensor device.

The invention relates to a preparation method of water soluble fluorescent nano-particles which are even and adjustable in size and have fluorescent marks; the preparation method comprises the following detailed steps of: mixing a segmented copolymer, a fluorescent material and an organic solvent in a certain ratio, heating the mixed solution and then holding for a certain time, adding a quanternization reagent in the obtained solution, heating and holding for a certain time; centrifuging, re-dispersing precipitate in water, and heating at a certain temperature, thereby obtaining the water soluble fluorescent nano-particles which are even and adjustable in size and have fluorescent marks, wherein the copolymer consists of a hydrophobic chain and a hydrophilic chain, preferably, the hydrophobic chain consists of the hydrophobic chain and polymethyl methacrylate, and the hydrophilic chain consists of poly(2-vinyl pyridine), poly(4-vinyl pyridine) and polymethyl methacrylate dimethylamino ethyl ester; the fluorescent nano-particles obtained by the method are even in size and have the hygrometric state particle size effectively adjustable within the range of 50nm to 400nm; and the method is simple, short in technological process, excellent in fluorescence effect and low in cost, and is suitable for large-scale production.

The invention relates to an alkali lignin gasification coal-water slurry dispersing agent and a preparation method thereof, belonging to the field of gasification coal-water-slurry production technology. The alkali lignin gasification coal-water slurry dispersing agent comprises the following raw materials in parts by weight: 100 parts of alkali lignin, 30-50 parts of carbonyl compounds, 150-250 parts of aldehydes, 25-90 parts of sulfonating agent and 200-400 parts of water. According to the alkali lignin gasification coal-water-slurry dispersing agent, alkali lignin is used as a main raw material and urea, acetone, sulfite and the like are used as modifiers, the raw materials are low in cost and easily available. The addition of the alkali lignin gasification coal-water slurry dispersing agent is small when the alkali lignin gasification coal-water slurry dispersing agent is used for preparing gasification coal-water slurry. The alkali lignin gasification coal-water-slurry dispersing agent has no sharp aroma, is dry and powdered, and convenient to store; the high stability advantage of lignin serving as the coal-water slurry dispersing agent is retained, but also the dispersion property can be greatly improved, the liquidity of the coal-water slurry prepared by using the product is obviously better than that of other lignin products, and the alkali lignin gasification coal-water-slurry dispersing agent is especially suitable for the preparation of the gasification coal-water slurry.

The invention belongs to the field of permanent magnet materials, and particularly relates to a method for preparing high-coercivity sintered neodymium iron boron through pressurized diffusion heat treatment. The method specifically comprises the following steps of preparing a low-melting-point alloy containing one or two of heavy rare earth elements Tb or Dy; crushing the alloy into fine powder and mixing the fine powder with an organic solvent to form slurry; coating the alloy slurry on the surface of a clean sintered magnet and putting the sintered magnet into a heat treatment furnace; andfilling a certain amount of high-purity Ar gas into a specially-made high-temperature and high-pressure furnace, and carrying out pressure heat treatment to finally obtain the magnet subjected to pressurization diffusion treatment. According to the present invention, the coercive force of the neodymium-iron-boron sintered magnet prepared through the method is higher than that of a magnet which isnot pressurized and diffused under the same condition; in the high-temperature heat treatment process, isostatic pressure is applied in the furnace, so that the diffusion efficiency of heavy rare earth elements is improved, and the coercive force of the magnet is more efficiently improved; the diffusion heat treatment time can be properly reduced in the actual production process, the energy consumption is effectively reduced, and the production cost is reduced.

The present invention describes a process for the preparation of LiBF4 by reacting LiBO2 with 10 to 48% HF solution in aqueous solution at ambient temperature, concentrating the product and recrystallizing to obtain high purity LiBF4.

The invention discloses a preparation method of monofunctionalized nonlinear polyethylene glycol. The monofunctionalized nonlinear polyethylene glycol has a nonlinear multivalent group U, one side ofthe nonlinear multivalent group is connected with a single functional end group, and the other side of the nonlinear multivalent group is connected with at least two linear polyethylene glycol chains.The preparation method includes the steps, first, a low molecular weight intermediate IM1 is obtained first, and the single functional end group or a microvariant form is introduced; and the step only refers to an organic reaction between low molecular weight reagents, the controllability is good, the structure can be precisely controlled, selectable segregation patterns are diverse, and a high-purity intermediate can be obtained; and second, then a polyethylene glycol component is introduced, and the monofunctional nonlinear polyethylene glycol with a high substitution rate can be obtained directly or by simple chemical modification of a terminal. When the monofunctionalized nonlinear polyethylene glycol continues functionalized modification or is used as a reaction raw material to construct a multistage branched nonlinear structure, the reaction steric hindrance is small, and a relatively high substitution rate or a relatively high grafting rate can also be obtained.

The invention discloses a sol gel preparation method of barium strontium titanate (BST), which takes cheap inorganic matter including TiO2, Ba(NO3)2, Sr (NO3)2 and the like as raw materials. The formula of a ceramic component is Ba0.5Sr0.5TiO3. The sol gel preparation method comprises the specific steps: (1) preparing BST precursor sol; (2) preparing ceramic by using BST ceramic powder. The barium strontium titanate powder prepared by the sol gel preparation method has a high crystallization degree and a uniform crystal grain size; the size of crystal grains reaches to a nano grade which is about 30nm to 40nm. When the prepared Ba0.5Sr0.5TiO3 ceramic is subjected to heat preservation for 2 hours at a sintering temperature of 1250 DEG C, and the density is up to be 95% of theoretical density; compared with a traditional solid-phase preparation method, the method has the advantages that the sintering temperature of the product is reduced and the product has good dielectric properties: under the frequency of 1KHz, a room-temperature dielectric constant epsilon is equal to 930 and the dielectric loss tan delta is equal to 0.08.

The invention discloses an active calcium silicate, and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a coupling agent and water to prepare a dispersion solution; (2) adding calcium silicate into the dispersion solution prepared in the step (1), and stirring; carrying out vacuum filtration to obtain modified active calcium silicate; and (3) drying the active calcium silicate prepared in the step (2). The invention also discloses a plastic stuffing which comprises the active calcium silicate, a lubricant, polymers and a compatilizer. The invention also discloses a method for preparing the plastic stuffing. When being used in blow molding, running, injection molding and other plastic products, the active calcium silicate or plastic stuffing has favorable dispersion effect and toughening effect.

The invention discloses a preparation method and application of cubic molybdenum nitride, and belongs to the field of lithium ion battery electrode materials. The preparation method comprises the following steps: S1, mixing an ethanol solution of urea, an ethanol solution of melamine and an ethanol solution of ammonium molybdate tetrahydrate, and stirring to obtain a mixed solution, wherein the mass ratio of ammonium molybdate tetrahydrate to urea to melamine in the mixed solution is (5-11): 100: (3-6); S2, aging the mixed solution at room temperature to form sol/gel, and freeze-drying to form a solid; S3, pre-sintering the obtained solid, and then carrying out heat treatment to obtain precursor powder; and S4, roasting the obtained precursor powder in a nitrogen atmosphere, and cooling to room temperature to obtain the molybdenum nitride electrode material. The nanoscale molybdenum nitride powder product is obtained through a simple process, has a cubic structure, is small in grain size and uniform in granularity, and has excellent cycle performance and relatively high specific capacity when being used as a lithium ion battery negative electrode material.

The invention discloses a preparation method of biomass cardanol internal-plasticization hydrogenated nitrile-butadiene rubber and relates to rubber preparation methods. The preparation method is characterized in that biomass cardanol is used as the main raw material, and the biomass cardanol is allowed to have grafting reaction with hydrogenated nitrile-butadiene rubber under the effect of cumenehydroperoxide to achieve chemical boning between the cardanol and the hydrogenated nitrile-butadiene rubber so as to achieve internal plasticization. The preparation method has the advantages that the use of petroleum-based raw materials is reduced, the cardanol is abundant, the reaction process is simple, an evident product plasticizing effect is achieved, excellent product thermal stability isachieved, plasticizer migration is close to zero, and the prepared rubber is in line with the concept of green and environment-friendly circular economy and is promising in market prospect.

The invention belongs to the field of lithium ion batteries and provides a lithium ion battery anode material Li2Mn1-xMgxSiO4/C and a preparation method thereof, wherein x is larger than or equal to 0 and smaller than or equal to 0.1. The defect of poor electrochemical performances of an existing lithium ion battery anode material Li2MnSiO4 can be overcome. Electronic conductivity of the material can be improved by carbon compounding, and by doping of positive ions, the material can be stabilized structurally, cycle stability of the material is improved, and specific discharge capacity and cycle stability of the material are improved remarkably. In addition, by adoption of a sol-gel method for preparation of the material Li2Mn1-xMgxSiO4/C, a prepared product has advantages of high crystallization quality, high chemical uniformity, particle fineness, high purity and suitableness for industrial production.

Disclosed in the present invention is a protein tyrosine phosphatase inhibitor. The preparation method therefor is: extracting the crude product from the Isaria Fumosorosea Wize solid or liquid fermentation broth using ethyl acetate, ethanol, methanol, or a mixed solvent of chloroform and methanol; separating the obtained extract using column chromatography on silica gel; and obtaining the target product. The inhibitor can be used to prepare pharmaceutical compositions for treating and preventing diabetes, obesity and cancers.

The invention relates to a preparation method for synthesizing lanthanum hafnate powder by using a sol-gel process. The method comprises the following steps: dissolving hafnium tetrachloride (HfCl4) and lanthanum nitrate hydrate (La(NO3)3.xH2O) in deionized water, conducting sufficient stirring, adding a certain amount of citric acid powder, and performing stirring at 50-80 DEG C for 1-3 hours toform sol; weighing a certain amount of ethylene glycol, dissolving the ethylene glycol in the solution obtained in the step 1, and carrying out stirring for 2-4 hours at a temperature of 70-90 DEG C to form gel; and fully drying the gel obtained in the step 2, and calcining the gel at a temperature of 800-100 DEG C for 8-10 hours to obtain the lanthanum hafnate (La2Hf2O7) powder. The preparation method disclosed by the invention has the advantages of controllable chemical components of the synthetic powder, low calcining temperature, good uniformity, high purity and the like.

The invention discloses a preparation method of a monodisperse oil-phase nano barium sulfate dispersion, which is characterized by comprising the following steps of: simultaneously dissolving a modifier A and a barium compound in a solvent A to obtain a solution A; dissolving a compound containing sulfate ions in a solvent B to obtain a solution B; simultaneously injecting the solution A and the solution B into a super-gravity rotating packed bed through a feeding hole to obtain nano barium sulfate slurry, and then carrying out modification reaction; centrifugally washing the slurry after themodification is finished, and dispersing the obtained filter cake in water to obtain a water-phase nano barium sulfate dispersion; and adding a modifier B into the water-phase nano barium sulfate dispersion prepared in the step S3 for modifying, centrifugally washing the water-phase nano barium sulfate dispersion after modifying, and dispersing the water-phase nano barium sulfate dispersion in anoily medium to obtain the monodisperse oil-phase nano barium sulfate dispersion. The particle size of the monodisperse nano barium sulfate dispersion prepared by the method is about 15 nanometers, theparticle size distribution is uniform, no precipitate exists after the monodisperse nano barium sulfate dispersion is stored for more than or equal to 12 months, and the monodisperse nano barium sulfate dispersion is displayed in a monodisperse state through a transmission electron micrograph and is extremely good in dispersity.

The invention relates to the technical field of regeneration of contaminated soil, and discloses an intermittent chemical drug feeding type shallow soil remediation device. The device comprises a rack; a vertical rod is fixedly installed in the rack; chemical drug containing boxes are fixedly installed between the left and right ends of the vertical rod and the rack; a sliding plate is slidably connected to the lower end of each chemical drug containing box; a discharging hole is formed in each sliding plate; a discharging groove is formed in the lower end of each chemical drug containing box;and a moving groove is formed in the lower end of each chemical drug containing box. According to the intermittent chemical drug feeding type shallow soil remediation device, the device is dragged bya machine to conduct soil turning operation on the contaminated soil, and then a soil turning roller rotates to turn the soil and drives a cam to rotate at the same time; when a protruding part of the cam is far away from a moving plate, a bent pipe rotates back through a guide rod, and meanwhile the upper end of the bent pipe moves relatively; a connecting rod drives a sliding rod to move; and the sliding rod drives each sliding plate to slide, so that the indirect discharging effect of each chemical drug containing box is achieved.

The invention discloses a preparation method of hydroxyl apatite. The preparation method is a sol-gel method and comprises the following steps: individually dissolving a calcium source and a phosphorus source into different solvents, mixing two solvents, aging obtained mixed solution at a temperature of 40 to 60 DEG C, drying obtained gel in a baking oven with a temperature of 80 to 100 DEG C, and subjecting obtained dry gel to a heat treatment (600 to 800 DEG C) so as to obtain block shaped hydroxyl apatite. The invention also provides an application of hydroxyl apatite in 3D printing moulding. The application comprises the following steps: ball-grinding hydroxyl apatite, sieving, adding a PVA solution with a mass concentration of 3 to 10%, blending to obtain slurry; carrying out layer casting and moulding by a ceramic 3D printer; placing obtained model in a sintering furnace; carrying out a heat treatment for 4.5 to 5.5 hours at a temperature of 500 to 800 DEG C, and finally cooling the product in the furnace.