126 results about "Borane" patented technology

The present invention relates to a dental diaphragm copolyester and a preparation method thereof, the preparation method comprises the following steps: 2, 5-furandicarboxylic acid or an ester thereof, aliphatic or alicyclic diol and (2-hydroxy-5-formyl phenyl) diphenylborane are subjected to a reaction to obtain an esterification or ester exchange product; and carrying out condensation polymerization on the esterification or ester exchange product and the stabilizer to prepare the copolyester for the dental diaphragm. 2, 5-furandicarboxylic acid is derived from a renewable biomass resource and meets the requirements of green and sustainable development; compared with terephthalic acid and furan ring structures, the film has higher rigidity and polarity, the yield of hot press molding is improved, the same correction force can be met by a thinner film, the wearing comfort of a patient is improved, and meanwhile stress relaxation is improved; the catalyst perfectly combines strong Lewis acidity, intramolecular stabilization and potential bifunctional activation through structural design, provides possibility for efficient and green synthesis of polyester, avoids use of heavy metal, and is higher in biological safety.

The invention discloses an inorganic-organic hybrid cross-linked network high-toughness material and a preparation method thereof, and belongs to the technical field of engineering material preparation. The high-toughness material is composed of an inorganic phase component and an organic phase component, the inorganic phase component is prepared from 5 to 10 parts of amino modified silicon dioxide nanoring; the organic phase component is prepared from the following components in parts by weight: 90 to 105 parts of polycaprolactone glycol, 14.5 to 16.5 parts of isophorone diisocyanate, 0.8 to 1.5 parts of dibutyltin dilaurate, 4 to 6 parts of bis-catechol borane and 6 to 10 parts of polydopamine nano particles. The fracture performance of the material can reach 20 kJ / m or above and is far higher than-1 kJ / m of a common elastomer and-10 kJ / m of high-toughness hydrogel, and meanwhile the tensile strength of 30 MPa or above is kept. According to the material disclosed by the invention, the dynamic borate bond is utilized, after the material is in contact with a damaged section, efficient self-repairing can be realized after the material is placed at room temperature for 24 hours, and the repairing efficiency is gt; by heating and applying pressure, the whole material can be reshaped through fracture and recombination of the dynamic bonds, and green and sustainable effects are achieved.

The invention discloses a preparation method of a copper-palladium alloy loaded nano titanium dioxide semiconductor material as a catalyst for a carbon dioxide reduction reaction. Firstly, alloy nanoparticles are generated through a sol-gel method, the morphology of the nanoparticles is controlled and agglomeration is prevented through oleylamine and oleic acid, and borane-tert-butylamine is added at the temperature of 170 DEG C to regulate and control the sizes of the generated alloy nanoparticles. A series of characterizations prove that the catalyst has a very good particle loading condition, uniform particle distribution and increased reaction active sites, and shows excellent activity when being applied to a carbon dioxide reduction reaction, when the loading capacities of copper and palladium are respectively 1%, the activity of the obtained catalyst is the highest, the methane generation rate can reach 20.23 mol / g / h, and the methane generation rate can reach 20.23 mol / g / h. The selectivity of methane reaches 100%.

The present application relates to a kind of catalyst composition and its application in catalytic preparation optically active secondary alcohol, the catalyst composition includes chiral ionic bridged aryloxyalkane rare earth complex and additive, the additive is selected from one or more of pyrimidine, N,N-dicyclohexylmethylamine, 4,4'-dipyridyl.The above-mentioned catalyst composition can be used for synergistically catalyzing asymmetric borohydration of chalcone and its derivatives with pinacol borane, and show high catalytic activity and high enantioselectivity, product yield is as high as 99%, ee value can reach 84%, provide a reliable new way for the efficient, high selective synthesis of optically active secondary alcohol.

The present disclosure relates to methods and apparatuses for depositing metal-containing material on a substrate by a selective deposition process. The method comprises providing a substrate in a reaction chamber, providing a metal alkoxide precursor into the reaction chamber in a vapor phase; and providing a second precursor into the reaction chamber in a vapor phase to form metal-containing material on the substrate. The second precursor according to the disclosure comprises a borane compound and the substrate comprising a first surface and a second surface.

The present application relates to the application of open-cage borane compounds in the preparation of immunosuppressants, belonging to the technical field of biological medicine. The open-cage borane compounds of the present application include nest borane compounds and / or spider web borane compounds, and the pharmaceutically acceptable solvates or pharmaceutically acceptable complexes of the nest borane compounds and the spider web borane compounds. The open-cage boron clusters of the present application have dehydrogenase-like activity, can catalyze the dehydrogenation reaction of hydroxyl-containing organic substrates in a biological system, promote the conversion of NAD(P) + to NAD(P)H, further improve the intracellular oxidation-reduction ratio, induce cell redox stress, and further reshape the metabolic pattern of HSCs from the source, promote the differentiation of immune cells to immunosuppressive phenotype, and play an immunosuppressive role.

The invention discloses a nitrogen-rich energetic ionic salt compound based on bis-(5-aminotetrazole) boron. The nitrogen-rich energetic ionic salt compound comprises bis-(5-aminotetrazole) boric acid guanidine salt (I), bis-(5-aminotetrazole) boric acid aminoguanidine salt (II) and bis-(5-aminotetrazole) borane perchlorate (III), the structural formulas of the compounds are shown as (I)-(III). The compound can be used for mixed explosives and fuel-rich propellants.

The application discloses a kind of efficient adsorption separation method of impurities in borane preparation process, belong to gas separation technical field.The method includes: after ZIF-8 powder is vacuum dried, with 3-aminopropyl triethoxysilane in anhydrous toluene at 80 ℃ reflux reaction 12-24 hours, after washing, dry and obtain amido functionalization NH2-ZIF-8 composite adsorbent;It is filled in vertical fixed bed adsorption tower, and under-30 ℃-20 ℃, 0.3-0.8MPa, the crude ethyl borane gas containing boron trifluoride is imported and is adsorbed at low temperature;After adsorption saturation, regenerate by 80 ℃ heating and vacuum extraction.The grafting amount of amido on the surface of NH2-ZIF-8 obtained by the method is 2.0-3.5mmol / g, specific high selectivity adsorption of BF3 is realized, sufficient adsorption sites are provided, and the adsorbent has strong regeneration performance.

To provide a method for obtaining an optically active hydrogen-phosphine borane compound at high optical purity. Also, to provide a method for obtaining an optically active 2,3-bis(dialkylphosphino)pyrazine derivative at high optical purity. Provided is a method for producing an optically active hydrogen-phosphine borane compound comprising carrying out a decomposition reaction of an optically active phosphine borane compound in the presence of a phase-transfer catalyst using an alkaline aqueous solution and an organic solvent. Also provided is a method for producing an optically active 2,3-bis(dialkylphosphino)pyrazine derivative using the optically active hydrogen-phosphine borane compound obtained.

The invention discloses a preparation method of a sodium lauryl glycol carboxylate compound, which comprises the following specific steps: adding 1, 2-epoxydodecane and glycolic acid into a first reaction flask containing a solvent, and carrying out heating reaction under the action of a large-steric-hindrance catalyst to obtain lauryl glycol acetic acid; wherein the solvent is cyclohexane, normal hexane or methylbenzene, and the large steric hindrance catalyst is tri (pentafluorophenyl) borane; and S3, adding the lauryl glycol acetic acid prepared in the step S1 into a second reaction flask containing water, and adjusting the pH value of the solution in the second reaction flask to 8.5-11.5 by using a certain amount of sodium hydroxide solution to prepare lauryl glycol sodium carboxylate, namely the target compound. According to the preparation method disclosed by the invention, the single selectivity of the synthesis process is improved, so that the purity and yield of the sodium lauryl glycol carboxylate compound synthesized by the route are greatly improved, and the product becomes better and better in application.

The invention discloses a hexagonal scandium hydrogen compound and a preparation method thereof, and the preparation method comprises the following steps: taking a borane ammine complex as a solid hydrogen source, tabletting the borane ammine complex and elemental scandium through a mold, and stacking according to'hydrogen source-scandium-hydrogen source '; loading the assembly into a CVD diamond single crystal tube with holes, and carrying out secondary wrapping with NaCl to form a sealed reaction unit; carrying out segmented pressurization / depressurization in a cubic press, electrifying and segmented heating under the condition of 800-1200 DEG C, and carrying out pressure maintaining and cooling to complete synthesis; according to the method, local high hydrogen partial pressure is established under the action of moderate high pressure and double-layer sealing, external introduction of high-pressure hydrogen is avoided, and the equipment complexity and the safety risk are reduced; the product prepared by the invention is hexagonal-phase ScH3, can stably exist at normal temperature and normal pressure, and is different from cubic-phase ScH3 which can only be synthesized under an extreme high-pressure condition and cannot be kept stable after pressure relief, XRD and structure refinement are consistent with the standard, and the process can be repeated and amplified.

The invention discloses a method for preparing benzyl borate compounds through chromium catalysis, and belongs to the technical field of organic synthesis. According to the method, aryl carboxylic ester is taken as a raw material, pinacolborane is taken as a boron source and a hydrogen source, metal chromium salt is taken as a catalyst, a specific ligand and elemental magnesium are added, and reaction is performed in a tetrahydrofuran solvent, so that the deoxidation boronization reaction of the aryl carboxylic ester is realized. Benzyl monoborate or benzyl subunit diborate can be selectively prepared through ligand regulation and control. The method has the advantages of mild reaction conditions, cheap catalyst, wide raw material source, simple operation and good chemical selectivity.

A method of forming high quality a-BN layers. The method includes use of a precursor chemistry that is particularly suited for use in a cyclical deposition process such as in chemical vapor deposition (CVD), atomic layer deposition (ALD), and the like. In brief, new methods are described of forming boron nitride (BN) layers from precursors capable of growing amorphous BN (a-BN) films by CVD, ALD, or the like. In some cases, the precursor is or includes a borane adduct of hydrazine or a hydrazine derivative.

This invention relates to a near-infrared low-potential electrochemiluminescence dual-ligand stabilized gold nanoclusters, their preparation method, and applications. The method uses chloroauric acid as the gold source and thiomalic acid and sodium citrate as reducing and stabilizing agents, respectively, in a two-step synthesis. First, Au is reduced online using thiomalic acid. 3+ Water-soluble gold nanoclusters were prepared using a novel method. These nanoclusters were then incubated with sodium citrate, and based on the ligand exchange principle, gold nanoclusters co-coated with thiomalic acid and sodium citrate were synthesized. The raw materials required for this invention are readily available and all possess good water solubility. The synthesis apparatus is simple, the conditions are mild, and the operation is safe. The resulting dual-ligand-coated gold nanoclusters exhibit good stability and produce low-potential near-infrared electrochemiluminescence in the long-wavelength region in an aqueous system. This overcomes the limitation of most current electrochemiluminescent materials requiring hydrazine hydrate or carbazide as a co-reactant. Using a non-toxic tert-butylamine-borane co-reactant, low-potential electrochemiluminescence radiation of 0.57V in the near-infrared region was generated.

The invention discloses a preparation method of a high-temperature-resistant antibacterial polyethylene composite plastic, which comprises the following steps: S1, by taking alkyl imidazole and M-dicarbon closed dodecaborane-1, 7-dicarboxylic acid as double ligands, carrying out thermal self-assembly on the double ligands and a metal salt solvent to obtain MOF (Metal Organic Framework); s2, dispersing the TiO2 / double-ligand MOF in an ammonium fluotitanate solution, adding a surfactant and inorganic weak acid, and performing in-situ deposition on TiO2 nanoparticles to prepare a TiO2 / double-ligand MOF compound; s3, carrying out melt extrusion granulation on the antibacterial master batch, polyethylene resin and an auxiliary agent to form antibacterial master batch; and S4, enriching the master batch on the surface layer by adopting a multi-layer co-extrusion process, keeping pure PE on the core layer, and cooling to obtain a finished product. According to the preparation method disclosed by the invention, the polyethylene composite material is endowed with excellent heat resistance and antibacterial durability, and the material has good anti-ultraviolet, self-cleaning, flame-retardant and smoke-suppressing properties, and is suitable for the fields with strict requirements on high-performance environment-friendly antibacterial plastics, such as food packaging, medical equipment, household appliance shells and the like.

The application provides a method for preparing nanometer noble metal by directly introducing reducing agent borane cluster into a carbon carrier, and the method is characterized in that: a borane cluster weak reducing agent is loaded on a carbon carrier to reduce and prepare a supported nanometer noble metal in situ, and the weak reducing property of the borane cluster can avoid the agglomeration of metal sites; the reducing agent is introduced into the carbon carrier, and the hard supporting effect of the carbon carrier can also avoid the large-scale agglomeration of the formed metal. The nanometer gold noble metal is dispersed in the carbon carrier, the dispersion of the nanometer noble metal is good, and the size of the nanometer noble metal is less than 10 nanometers. Compared with the prior art, the reducing agent borane cluster is directly introduced into the surface of the carbon carrier in the application, the in-situ reduction of noble metal ions is realized, and the supported nanometer noble metal with high dispersion and small particle size is effectively obtained. The method is simple in operation, reliable in preparation process and good in repeatability, and is beneficial to large-scale preparation.

The utility model relates to the technical field of carborane preparation, in particular to a continuous flow tubular reactor for preparing carborane. Comprising a gasification structure and a feeding mechanism, the gasification structure comprises a gasification reaction pipe communicated with the feeding mechanism in a sealed mode, the gasification structure comprises a filler box body, a preheating box body and a high-temperature reaction box body which are sequentially arranged, one end of the gasification reaction pipe is located in the filler box body, and the other end of the gasification reaction pipe sequentially penetrates through the preheating box body and the high-temperature reaction box body; the feeding mechanism is arranged above the filler box body, and a discharging pipe of the feeding mechanism extends into the filler box body and is in sealed connection with the gasification reaction pipe; the filler box body is slidably arranged on the base table, a mounting plate for supporting the feeding mechanism is slidably arranged at one end of the base table, and when the gasification reaction tube is subjected to axial deformation due to thermal expansion and cold contraction, the filler box body and the feeding mechanism can synchronously move left and right. The structure can effectively cope with the axial deformation of the gasification reaction tube during expansion caused by heat and contraction caused by cold, and improves the adaptability and reliability of the whole structure.

The invention discloses a carborane hybridized cobalt cluster-based metal organic framework capable of selectively adsorbing C2HF5 from a mixture containing C2HF5 and C2F6, a preparation method of the carborane hybridized cobalt cluster-based metal organic framework and application of the carborane hybridized cobalt cluster-based metal organic framework in the aspect of hexafluoroethane purification. The carborane hybridized cobalt cluster-based metal organic framework is composed of para-carborane dicarboxylate ions, metal ions Co < 2 + >, chloride ions and organic nitrogen-containing ligands N1, N1, N3, N3, N5, N5-hexa (pyridine-4-yl) benzene-1, 3, 5-triamine, two Co < 2 + > and four oxygen atoms of two para-carborane dicarboxylate ions are bridged with one mu-Cl to form a cobalt binuclear cluster, and the cobalt binuclear cluster is used for preparing the metal organic framework. The cobalt binuclear cluster is coordinated and connected with an organic nitrogen-containing ligand to form a three-dimensional framework with a double-cage structure.

The invention discloses high-purity lithium borohydride and a preparation method thereof, and belongs to the technical field of inorganic synthesis.The preparation method comprises the steps that firstly, surface coordination activation is conducted on micron-sized lithium hydride through amino silane, and the reaction activity of the micron-sized lithium hydride is remarkably improved; and then, in a uniform ionic liquid organic solvent composite medium, efficiently synthesizing lithium borohydride with a purified borane complex at a mild temperature. For key impurity chloride ions, trimethylchlorosilane is innovatively introduced to carry out targeted precipitation conversion, and effective removal is carried out before crystallization. And finally, directly separating out a high-purity product from a reaction system through a directional crystallization technology. According to the high-purity lithium borohydride and the preparation method thereof disclosed by the invention, high-efficiency preparation of high-purity and low-chloride-ion lithium borohydride under a mild condition is realized, a key reagent can be recycled, and the problems of high energy consumption and insufficient purity in a traditional method are perfectly solved.

The invention discloses a preparation process of 5-bromonicotinic acid, which comprises the following steps: sequentially adding ethyl nicotinate and pinacol borane into a reaction kettle, heating to react, adding N-bromosuccinimide into the reaction kettle, maintaining the reaction temperature, and filtering to remove a byproduct succinimide after the reaction is finished. And carrying out reduced pressure distillation to recover the solvent to obtain the ethyl 5-bromonicotinate. Adding ethyl 5-bromonicotinate into another reaction kettle, adding an alkali solution, heating, stirring for reaction, cooling reaction liquid after the reaction is finished, dropwise adding hydrochloric acid to adjust the pH value, cooling, crystallizing, filtering, washing a filter cake, and drying to obtain a 5-bromonicotinic acid finished product. The total yield gt of the preparation process of the 5-bromonicotinic acid; the HPLC purity is gt; 99%. The process is simple and convenient to operate and easy to implement, raw materials are cheap and easy to obtain, reaction conditions are mild, high-temperature and high-pressure reaction is not needed, and requirements on equipment are reduced. The whole process is safer to the environment, and green and pollution-free production can be realized.

The invention provides a low-temperature high-conductivity polyether electrolyte and a preparation method thereof. Polyethylene glycol monomethyl ether methacrylate and polyethylene glycol diacrylate are cross-linked to form a polyether cross-linked network, tri (pentafluorophenyl) borane and lithium salt are introduced to form a borane-lithium salt complex system, and the lithium ion battery electrolyte is prepared by accurately controlling the molar ratio of lithium ions to borane to be 1: (0.02-0.20). By utilizing an acetonitrile complexing-vacuum desolventizing-in-situ polymerization curing process, the high-purity film electrolyte with the ionic conductivity being greater than or equal to 1 * 10 <-4 > S / cm, the residual acetonitrile being less than or equal to 500 ppm and the moisture being less than or equal to 1000 ppm at a low temperature is realized; the technical problems that when a traditional polyether electrolyte improves the crosslinking modulus, the low-temperature conductivity is reduced, the processing window of a high-lithium-salt system is narrow, and the interface stability of a residual solvent and water is difficult to consider are effectively solved, and the polyether electrolyte has excellent low-temperature performance and processing stability and wide solid-state lithium battery application prospects.

The invention relates to the technical field of surface strengthening, in particular to high-entropy alloy brazing paste as well as a preparation method and a brazing process thereof. The brazing paste comprises the following components in parts by mass: 60-85 parts of high-entropy alloy powder, 5-25 parts of reinforced hard phase powder, 0.5-8 parts of an organic boron precursor, 1-5 parts of a binder and 2-15 parts of an organic solvent, wherein the organic boron precursor comprises at least one of carborane, a carborane derivative and a polymer containing a carborane structure; the carborane comprises at least one of o-carborane, m-carborane and p-carborane. The soluble organic boron precursor is adopted to replace traditional inorganic boron powder, molecular-level uniform distribution of boron elements is achieved in the paste stage, ultrasonic vibration assistance is introduced in the brazing coating process, the organic boron precursor is cracked to release active boron atoms in situ to participate in alloy reaction, and the brazing coating effect is improved. The wettability of the brazing paste and the reliability of coating connection are effectively improved.

This invention discloses a Pt-CoMo-NC hollow structure catalyst for hydrogen production from ammonia borosilicate hydrolysis and its preparation method. The preparation method includes: dissolving cobalt nitrate in methanol; dissolving 2-methylimidazole in another methanol solution; rapidly adding the cobalt nitrate methanol solution to the 2-methylimidazole methanol solution under stirring, continuing stirring at 25-30℃ for 10-72 h, centrifuging, washing, and vacuum drying to obtain ZIF-67 powder; completely dissolving a Mo source and chloroplatinic acid in a solvent, adding the ZIF-67 powder to the solution under stirring at 20-35℃, and continuing stirring at this temperature for 10-60 min; continuously stirring at 60-80℃ until the solvent is completely evaporated to obtain MoPt / ZIF-67; and carbonizing MoPt / ZIF-67 in an inert gas at a temperature of 500-950℃ to obtain the Pt-CoMo-NC catalyst. This catalyst exhibits excellent performance in catalyzing the hydrogen production from ammonia borosilicate hydrolysis and has promising application prospects.

A molecular probe for selective detection of a nitrate and / or a decomposition product of a nitrate by generating a fluorescence signal in response to an excitation in the wavelength range between 340-370 and 480-520 nm, wherein the molecular probe is selected from a triarylborane dye according to formula (7) and a BODIPY™ (boron-dipyrromethene) dye according to formula (13):

The invention belongs to the technical field of material synthesis, and particularly relates to calcium dodecahydrododecaborate as well as a synthesis method and application thereof. According to the synthesis method of calcium dodecahydrododecaborate provided by the invention, calcium hydride CaH2, a borane dimethyl sulfide complex and an ether mixed organic solvent react in a reaction kettle to obtain a product, and monoethylene glycol dimethyl ether and tetrahydrofuran cyclic ether are compounded to obtain the ether mixed organic solvent; according to the method, the yield and purity of the product calcium dodecahydrododecaborate are improved, meanwhile, deionized water is used for carrying out solvent exchange on the product and drying is carried out, the purity of the product calcium dodecahydrododecaborate is further improved, efficient synthesis of calcium dodecahydrododecaborate is achieved, industrial preparation is facilitated, high-purity calcium dodecahydrododecaborate is provided, and the method is suitable for industrial production. The method is expected to meet the requirement of solid electrolyte battery commercialization on electrolyte, and solves the technical problem of lack of an efficient synthesis process of calcium dodecahydrododecaborate at present.

The invention discloses ablation-resistant carborane phenolic aerogel and a preparation method thereof, and belongs to the technical field of aerogel materials. In order to solve the technical problems that existing phenolic aerogel is insufficient in ablation resistance and carborane phenolic aerogel is difficult to prepare, a meta-carborane bisphenol monomer and formaldehyde are subjected to a sol-gel reaction under catalysis of a strong base, and the phenolic aerogel with a main chain containing a carborane structure is prepared through gelation, solvent replacement and supercritical drying in sequence. The method can significantly improve the residual weight rate and ablation resistance of the aerogel in nitrogen and air atmospheres, and is suitable for the field of external thermal insulation materials.

The invention discloses a metal carborane quaternary ammonium salt compound as well as a synthesis method and application thereof. The structural formula of the compound is as shown in a formula I in the specification. According to the synthesis method, n-hexyl carborane is taken as a starting raw material and is subjected to four-step efficient reaction, and the synthesis method comprises the following steps: 1, carrying out boron removal reaction to generate a nested carborane intermediate; 2, preparing trimethylamine salt and converting the trimethylamine salt into carborane trimethylamine salt; 3, carrying out coordination reaction on the carborane trimethylamine salt and ferrous chloride to form a metal carborane precursor; and 4, further processing to finally form the target metal carborane quaternary ammonium salt compound. The compound disclosed by the invention shows potential application value in the fields of homogeneous catalysis, solid propellant burning rate regulation and control and the like. I.

The application belongs to the technical field of zinc metal batteries, and discloses a kind of zinc metal battery anticorrosion electrolyte and its preparation method and application.The electrolyte includes solvent system, zinc salt and additive combination;The solvent system includes deionized water and 1,4-dioxane, the zinc salt is zinc triflate, and the additive combination includes dimethyl ether, methyl pyrazole and tris (pentafluorophenyl) borane.The preparation method includes: first, dissolve zinc triflate in deionized water to obtain a basic solution, then dissolve dimethyl ether, methyl pyrazole and tris (pentafluorophenyl) borane in 1,4-dioxane to obtain an additive solution, then mix and stir the two to obtain the electrolyte.The electrolyte is beneficial to improve the stability of zinc negative electrode interface, inhibit corrosion, side reactions and dendrite growth, and can be used in zinc metal batteries.

The invention discloses a synthesis method of an acyl borane compound, which is characterized in that the acyl borane compound is obtained through a cross dehydrogenation coupling (CDC) reaction of an aldehyde / alcohol compound and a coordination borane compound in a direct and mild manner with a brand-new concept. On the other hand, the types of rare compounds of the acyl borane compounds are enriched, a series of application and conversion researches of the acyl borane compounds are developed, and it is shown that the acyl borane compounds can be used as fine chemical engineering intermediates to be applied to construction of various practical molecular structures.