120 results about "Calcium hydride" patented technology

The invention discloses a high friction composite brake shoe for a railway wagon and a manufacturing method thereof. The composite brake shoe comprises: a steel back and a brake shoe body which is fixed on the steel back, wherein, the brake shoe body is prepared by materials which are synthesized by various components with the following weight ratio: 8 to13 parts of nitrile butadiene rubber, 2 to10 parts of styrene butasiene rubber, 5 to10 parts of cresol modified A-stage phenolic resin, 15 to 30 parts of steel fiber, 10 to 15 parts of magnesium oxide, 5 to 10 parts of calcined petroleum coke, 2 to 5 parts of silicon carbide, 10 to25 parts of mineral fiber, 5 to 10 parts of calcium hydride, 10 to 20 parts of barium sulfate, 5 to 10 parts of graphite, 1 to 5 parts of molybdenum disulfide, 1 to 5 parts of carbon black, 1 to 3 parts of sulfur and 1 to 3 parts of enhancer. The brake shoe can be used in the railway heavy-duty high-speed wagon and has stable friction performance and better wear resistance; the brake shoe can effectively inhibit the phenomena of metal inlay, cracks, dropping blocks and the like and reduce the damages on wheels; and the brake shoe is characterized by better impact resistance performance and good weatherability.

The invention relates to a method for synthesizing high-viscosity polyphenylene terephthalamide, and belongs to the technical field of polymer synthesis. The method comprises the following steps of: adding dissolution-helping salt into N-methyl pyrrolidone first, adding p-phenylenediamine for dissolution, adding paraphthaloyl chloride for polymerization, and washing and drying an obtained reaction product to obtain the polyphenylene terephthalamide. An acid absorbent used by the synthesis method is calcium hydride, the calcium hydride can react with hydrogen chloride produced in a polymerization reaction, and generated calcium chloride is a cosolvent in a solvent system and is favorable for the stability of a reaction system; and the calcium hydride can remove trace water in the reaction system, so that the influence of water on polyphenylene terephthalamide (PPTA) polymerization is eliminated. Moreover, the unreacted calcium hydride can be easily removed in the subsequent washing step after the PPTA polymerization is finished.

The invention discloses a calcium-magnesium hydrogen producing agent, of which the main component is a hydrogen producing agent. The hydrogen producing agent is selected from one or various combination of calcium hydride, magnesium hydride, calcium hydroxide magnesium, magnesium-magnesium hydride, calcium-calcium hydride, magnesium-calcium hydride, calcium-magnesium hydride, calcium-magnesium-magnesium hydride, calcium-magnesium-calcium hydride, calcium-magnesium-magnesium hydride-calcium hydride, coral calcium hydroxide magnesium, Na MgH3, and Mg2FeH6. the calcium-magnesium hydrogen producing agent can be added into water, beverage or wine as an additive, or can be coated on the surface of skin or taken as soaking liquid to remove internal or surface active oxygen. The calcium-magnesium hydrogen producing agent has a remarkable prompting effect for recovering various oxidized damages, relieving discomfort caused by drinking, diluting stain and wrinkle of the skin, recovering skin elasticity, and delaying senescence.

The invention provides an atom gas chamber inner wall coating method for slowing down atomic spin relaxation. The method includes the steps that firstly, rubidium atom steam is injected into an atom gas chamber; then, hydrogen with the pressure intensity of 10 Torr to 100 Torr is released into the atom gas chamber through hydride solid gas release agents (such as titanium hydride and calcium hydride), the pressure intensity is kept for tens to hundreds of hours at the temperature 50 DEG C to 150 DEG C, and a layer of rubidium hydride thin film can be attached to the inner wall of the atom gas chamber; and finally, hydrogen left in the gas chamber is evacuated, and the coating process is finished. Hydrogen is generated through the solid gas release agents in the coating process; compared with a traditional method that a high-pressure hydrogen bottle is used as a hydrogen source, the process safety is improved when rubidium hydride coating is conducted on the inner wall of the atom gas chamber, and hydrogen left in the gas chamber after rubidium hydride coating is evacuated; and compared with the method for directly sealing hydrogen in the gas chamber, stability of performance of the atom gas chamber is easily improved.

The invention relates to a synthesis method of celecoxib, which comprises the following specific steps of: 1, carrying out claisen condensation on p-methylacetophenone and trifluoroacetic acid ethyl esters in an aprotic organic solvent under the catalysis of alkali to obtain 1-(4-methylphenyl)-4,4,4-trifluoro-1,3-butanedione; and 2, reacting the obtained 1-(4-methylphenyl)-4,4,4-trifluoro-1,3-butanedione with sulfonamide-phenylhydrazine hydrochloride to obtain celecoxib, wherein in the step 1, the alkali for catalysis is selected from one or more of sodium hydride, potassium hydride, lithium hydride and calcium hydride. The synthesis method of celecoxib provided by the invention is easy to operate, high in yield, high in product purity and easy for industrial production.

The invention discloses a method and a device for preparing graphene through processing dry ice by shock waves, and belongs to the field of material processing. Firstly, the dry ice is selected as a carbon source, calcium hydride, lithium aluminum hydride or sodium borohydride is selected as a reducing agent, and the dry ice and the reducing agent are evenly mixed in a mass ratio of 2:1-4:1 to prepare a raw powder material; and then the raw powder material is shocked to induce a chemical reaction through the instantaneous high temperature and high pressure produced by high-speed impact of flying pieces driven by explosive detonation so as to obtain the high-quality graphene. The method for preparing the graphene is low in cost, simple in process, short in consumed time and capable of realizing industrial production. In addition, a way to deal with the global warming problem is provided, and the dry ice can be turned into the useful graphene.

The invention relates to a packing material for a micro-adsorption column for drying and/or purification of dissolved organic or biological analytes, such as toxins, antibiotics, vitamins, hormones, pesticides and similar, containing at least one drying agent which contains magnesium sulphate and at least one further drying agent selected from the group comprising aluminium oxide, calcium chloride, calcium hydride, calcium oxide, calcium sulphate, potassium hydride, silica gel, copper sulphate, magnesium oxide, magnesium perchlorate, molecular sieves, sodium hydroxide, phosphorus pentoxide, sulphuric acid on silica, phosphorus pentoxide on silica and 0.5 to 90 wt. % of a naturally-occurring or synthetic support with large internal surface such as zeolite, diatomic earths, bentonite, silicon dioxide or similar. The invention further relates to a micro-adsorption column packed with the above and use thereof.

The invention discloses a corrosion resistant aerated building block and a making method thereof. The corrosion resistant aerated building block is made from, by weight, 23-27 parts of waste concrete, 28-36 parts of quartz sand, 16-29 parts of pine sawdust, 13-21 parts of porous ceramsite, 18-34 parts of zirconium-silicon slag, 32-46 parts of high sulfate resistance Portland cement, 17-33 parts of pumice, 14-26 parts of kyanite, 22-34 parts of marine dredged sludge, 11-22 parts of desulfurized gypsum, 19-28 parts of calcium carbide slag, 10-15 parts of hawthorn fruit seed powder, 8-12 parts of sodium polystyrene sulfonate, 3.5-5 parts of calcium hydride and a proper amount of water. The aerated building block has the advantages of strong corrosion resistance, strong resistance to acids, alkali, salts and other corrosive media, high strength, good durability, impermeability, low heat conduction coefficient, good crack resistance, safety, environmental protection and durability.

A process for preparing the polylactic acid-polyethanediol block copolymer is prepared through the copolymerizing reaction between polyethanediol and lactide at 130-160 deg.C under -0.08-0.01 MPa and existance of calcium hydride for 8-12 hr, adding acetone for dissolving, deposition in distilled water and then in absolute alcohol, and vacuum drying.

The invention discloses a preparation method of a hydrogen storage alloy material. A structural formula of the material is ABx(x=3.0-3.5), wherein a chemical constituent of an element on A side is Lz1-yMgy, and y is 0.25-0.33; and B is NipCoz (Mn Al3)w, p is 2.5-3.3, z is 0-0.5, and w is 0-0.1. The preparation method comprises the following steps of: (1) adopting oxalic acid-ethanol solution as a precipitator, taking saline solution of rare earth, magnesium, nickel and various doped metal as raw materials, preparing a precipitate, and washing, filtering, drying and firing the precipitate to obtain an alloy oxide precursor; and (2) taking calcium hydride as reducing agent, and high-purity hydrogen as reducing atmosphere, carrying out reduction in a vacuum/atmosphere tubular furnace, and rinsing, soaking, washing and drying the reduzate to obtain hydrogen storage alloy powder. According to the preparation method, the rare earth oxide and metal salt are adopted as the raw materials, so that the adoption of expensive pure metal is avoided, the cost can be obviously reduced, the prepared alloy powder has mall granularity, the compositions are uniform, the discharge capacity is high, the performance is stable, and the hydrogen storage alloy material can be used as a negative active material of a large-power nickel-hydrogen battery.

The invention discloses a preparation method of SiC-SiAlCN glass ceramics, which comprises the following steps: preparing anhydrous methylbenzene by using methylbenzene and calcium hydride, and mixing the anhydrous methylbenzene and PCS (polycarbosilane) to obtain a PCS methylbenzene solution; preparing PAS (periodicacidschiff) by using metallic aluminium organic matter and polysilazane, and mixing the anhydrous methylbenzene and the PAS to obtain a PAS methylbenzene solution; then treating ceramic precursor polymer alloy prepared by mixing the PCS methylbenzene solution and the PAS methylbenzene solution with different ratio by adopting a post vacuum-solidifying atmosphere high-temperature pyrolytic process to obtain the SiC-SiAlCN glass ceramics which can be stably used at the temperature of 1400-1500 DEG C. SiC crystal particles in the SiC-SiAlCN glass ceramics prepared by the invention are dispersed and distributed in SiAlCN amorphous phases and are obtained from PCS micro-area crystallization in curing materials, and an SiAlCN covalent bond amorphous phase is obtained after a PAS area is pyrolyzed.

The invention discloses a purification method for acetonitrile. The method comprises the steps of using industrial grade acetonitrile as raw material, successively adding anhydrous aluminum chloride, potassium permanganate and sulfuric acid and carrying refluxing and distilling respectively, adding calcium hydride for drying, adding a 4A molecular siev for adsorption and purification, and finally performing distillation method to obtain purified acetonitrile. The purity of the acetonitrile obtained by the purification method provided by the invention is greater than 99.8%. Compared with the existing technology, the purification process is safe, simple, energy-saving and emission-reducing. The added purifying agent can be recycled after treatment, and the requirements of green chemical industry and environmental protection are met. The acetonitrile product obtained by the purification method has the advantages of stable quality and high purity, and has prospect for industrial production.

The invention discloses a preparation method of high-purity vanadium powder. The preparation method comprises the following steps: mixing vanadium-containing material with alkali metal or alkaline-earth metal chloride salt and then mixing with calcium hydride; then, carrying out vacuum thermal reduction to obtain a reduction product; washing the reduction product with ammonium chloride solution, alkaline liquor and acid liquor sequentially; and finally, carrying out dehydrogenation treatment to obtain high-purity vanadium powder. The preparation method has the advantages of being low in cost and energy consumption, moderate in reaction condition and safe in operation.

The invention relates to a mask powder with oxidation-resistant effect and a preparation method thereof. Coral calcium hydride used as a hydrogen production component is proportionally assisted by smectite, cocoon fiber powder, a grape seed extract and Aloe vera polysaccharides; the hydrogen generated in the product use process is fully utilized, thereby solving the problems of high hydrogen permeability and low storability; and the mask powder has the characteristics of high stability and high efficiency, can obviously enhance the effectiveness, binding property and stability of the product, enables the skin to sufficiently absorb and utilize the hydrogen and effective components in the formula, and can protect the epidermal cells from invasion of free radicals after long-term usage, thereby achieving the effects of resisting wrinkles and aging and moisturizing the skin, and increasing the elasticity and air permeability of the skin.

The invention relates to a preparation technology of active calcium hydride, and provides a method and a device for preparing the active calcium hydride. The method comprises the steps of: uniformly scattering calcium hydride powder as a raw material at a middle section of a quartz reaction tube of a horizontal tube-type electric heating furnace, wherein two ends of the quartz reaction tube are not sealed and are in a dried air environment at normal pressure; lastingly introducing dried hydrogen by micro-flow, and controlling the furnace temperature at 300-700 DEG C, wherein the reaction time is 8-12 hours; under the reaction condition, preparing solid active calcium hydride powder by a way that calcium hydride absorbs hydrogen and oxygen at the same time, wherein the molecular formula of the solid active calcium hydride powder is CaH2.2H.2O. The method is concise in preparation technology, mild in operation condition and less in environmental pollution and resource consumption. The prepared solid active calcium hydride powder can release hydrogen and oxygen at the same time in the water so as to be used as a storage carrier of a clean energy source, and the released hydrogen anions have the health-care action on the human body.

The invention discloses a preparation method of a comb-type polymer phase change energy storage material. The preparation method comprises the following steps: firstly, dissolving polymers such as dried poval and the like in a solvent the amount of which is 2-4 times that of the polymers, and then carrying out metallization reaction on the mixture and one of calcium hydride, sodium hydride, potassium hydride, sodium methoxide, sodium ethoxide, potassium methoxide or potassium ethoxide; stirring and reacting for 1-4 hours in the solvent at the temperature of 30-60 DEG C so as to obtain a polymer metalized product with an active group; adding at leas one of 1-halognated n-alkanes, wherein the molar ratio of the 1-halognated n-alkane to the polymers such as poval and the like is (0.1:1)-(6:1), and the adding speed is controlled at 1-10mL/min; adding a catalyst the weight of which is 0.01-1% of that of the polymers such as poval and the like; and stirring and carrying out grafting reaction for 4-12 hours in the solvent at the temperature of 30-90 DEG C; and washing the obtained product for impurity removal and drying, so as to obtain the comb-type polymer phase change energy storage material.

The present invention relates to a preparation method for chromatographic grade N,N-dimethyl formamide. The method comprises the following steps that: (1) a raw material N,N-dimethyl formamide flows through a calcium hydroxide adsorption column; (2) the N,N-dimethyl formamide after the adsorption and alumina are subjected to vacuum distillation, wherein the distillation is performed under a condition of 5-10 mmHg; (3) the distilled liquid is filtered by using a 0.45 mum microporous filtration membrane, and is subjected to bottling and storing through nitrogen filling to obtain the chromatographic grade N,N-dimethyl formamide. According to the present invention, the N,N-dimethyl formamide with the content of about 99.5% is adopted as the raw material, the calcium hydride column is adopted to adsorb the water and other impurities in the N,N-dimethyl formamide, the alumina is adopted to presinter to the temperature of 500-600 DEG C, and the vacuum distillation treatment is performed, such that the N,N-dimethyl formamide product with the purity more than 99.9% is prepared through the treatments of adsorbing, drying, and vacuum distillation, and the product can meet the chromatographic grade (HPLC) N,N-dimethyl formamide application requirements of the user.

Chromatographically pure ethyl ether and a preparation method and a production system thereof relate to the technical field of purification of chemical products. The preparation method is characterized in that industrial ethyl alcohol serves as a raw material and is subjected to oxidation impurity removal and a neutral reaction at first and then 4A molecular sieve adsorption, calcium hydride adsorption, basic alumina adsorption and activated carbon adsorption to obtain a rectifying stock solution, and at last, the rectifying stock solution is rectified. The preparation method is low in production cost, can prepare the chromatographically pure ethyl ether with good quality and high yield, and meets the requirements of chromatographically pure reagents. The production system comprises a 4A molecular sieve column, a calcium hydride column, a basic alumina column and an activated carbon adsorption column which are arranged in parallel and constitute a circulation line with a reaction kettle, and a gas-phase outlet of the reaction kettle is communicated with a gas-phase inlet in the bottom of a rectifying column. The production system is specially used for preparing the chromatographically pure ethyl ether, is high in production efficiency, can obtain the product with high purity, and can realize large-scale industrial production of the chromatographically pure ethyl ether.

A process for producing Co, Al alloyed NdFeB nanoparticles, by a microwave assisted combustion process, followed by a reduction diffusion process, includes the steps of: preparing a first solution of boric acid dissolved in 4 N HNO₃, dissolving iron nitrate nonahydrate, neodymium nitrate hexahydrate, cobalt nitrate hexahydrate, aluminium nitrate, the first solution in deionized water to form a second solution, adding glycine to the second solution in a molar ratio of 1:1 to form a third solution, subjecting the third solution to microwave radiation, thereby forming an first powder of NdFeCoAlB oxides, mixing the first powder with calcium hydride in a mass ratio of 1:1.1 (NdFeCoAlB oxides:CaH₂) to form a second powder, compacted into a powder block, annealing the second powder in a vacuum furnace, washing the annealed second powder with a solution of ethylenediaminetetraacetic acid; and vacuum drying the second powder.

The invention discloses a method for preparing titanium powder, and belongs to the technical field of rare metal refining. A technical problem solved by the method is to provide a titanium powder preparation process with low cost, milder conditions and safer operation. The method for preparing the titanium powder comprises the following steps: A, mixing titanium-containing materials with calcium oxide, pressing, molding, and sintering to obtain a sintered product; B, breaking the sintered product obtained in step A, mixing with calcium hydride, pressing and molding to obtain a pre-reduced blank; C, reducing the pre-reduced blank obtained in step B by vacuum heat to obtain a crude product; D, acid pickling, washing and drying the crude product obtained in step C to obtain the titanium powder. The method for preparing the titanium powder adopts a low-cost titanium-containing material as a raw material, and reduces energy consumption due to formation of a calcium titanate intermediate anduse of vacuum thermal reduction, greatly reduces preparation cost of the titanium powder, and the obtained titanium powder has a purity of more than 99% and a yield of the titanium powder is larger than 98% and the method provides an efficient way for production of titanium powder.

The invention relates to a purification method for high-purity organic solvent normal propyl alcohol. The method includes steps: subjecting raw normal propyl alcohol to removal of high ultraviolet absorption impurities by the aid of activated carbon, utilizing desiccants such as anhydrous calcium sulfate or calcium hydride for drying and dehydration, rectifying, filtering and packaging to obtain the high-purity organic solvent normal propyl alcohol. By the purification method for the high-purity organic solvent normal propyl alcohol, chromatographic-grade normal propyl alcohol products with the purity higher than 99.8% can be obtained, the yield is higher than 95%, the acceptance rate is higher than 93%, and application requirements of users in aspects of scientific researches, subject studies and the like of the high-purity organic solvent (HPLC) normal propyl alcohol can be met. In addition, compared with conventional methods, the purification method for the high-purity organic solvent normal propyl alcohol is high in product purity, simple and convenient to operate and stable in product quality and can be used for large-scale production.

The invention provides a hydrogen-rich water or hydrogen-rich beverage preparation method. According to the technical scheme of the invention, firstly, calcium hydroxide is prepared into tablets or calcium hydroxide as an effective ingredient is prepared into sustained-release tablets, sustained-release granules or microcapsules. Secondly, the obtained product is placed into a container, wherein water or beverage can permeate into the container or can be accommodated inside the container. In this way, the water/beverage can react with calcium hydride reaction to generate hydrogen. The mass ratio of the effective ingredient calcium hydroxide to auxiliary materials is 1:0 to 1:5. The mass ratio of an adhesive and a controlled-release agent in the auxiliary materials is 1:2 to 2:1.

The invention discloses a Fe2O3/Sr2FeTaO6-x photocatalyst, a preparation method and application thereof. The preparation method includes the steps of: dissolving oleic acid in anhydrous ethanol, adding sodium oleate, then adding tantalum pentachloride, an organic ferric salt and an organic strontium salt, performing stirring, then carrying out hydrothermal reaction, and then conducting flushing and drying to obtain Sr2FeTaO6 powder; mixing the Sr2FeTaO6 powder with calcium hydride, and conducting calcination to obtain dark red Sr2FeTaO6-x; preparing a ferric salt ethanol water solution, addingSr2FeTaO6-x, stirring the substances violently, carrying out hydrothermal reaction, then performing natural cooling, and conducting washing and drying to obtain the Fe2O3/Sr2FeTaO6-x photocatalyst. The invention provides a brand-new preparation method of the photocatalyst on the basis of a hydrothermal-calcium hydride modification method, the Fe2O3/Sr2FeTaO6-x composite semiconductor system withhigh interfacial force can be finally synthesized, and photocatalytic degradation of nitric oxide is greatly improved.

The invention relates to a method for purifying chromatographic grade butyl acetate. The method comprises the following steps of: absorbing a raw material, namely butyl acetate by using activated carbon and an activated alumina column to remove organic impurities, calcium hydride or magnesium sulfate, drying and dehydrating, rectifying, filtering, further removing impurities, and performing nitrogen-infilling packaging to obtain a high purity liquid chromatography (HPLC) grade butyl acetate product. By the method, a chromatographic grade butyl acetate product with the purity of more than 99.9 percent can be obtained, the yield is over 93 percent, the qualification rate is over 93 percent, and application requirements of customers of a HPLC reagent butyl acetate on aspects such as scientific experiments, subject research and the like can be met; meanwhile, compared with the conventional method, the invention has the advantages that: the product has high purity and stable quality, and the method is easy to operate and is suitable for large-scale production.