13 results about "Metaboric acid" patented technology

The invention belongs to the field of polyurethane materials, and particularly discloses a flame-retardant polyurethane material as well as a preparation method and application thereof. The flame-retardant polyurethane material comprises the phosphorus flame retardant, the melamine polyphosphate and the barium metaborate, the phosphorus flame retardant, the melamine polyphosphate and the barium metaborate have a synergistic effect, a continuous, compact and glassy-state-like carbon barrier layer is formed at the burning position of the material, halogen-free flame retardance of the polyurethane material can be achieved, and molten drops can be effectively prevented. Besides, the polyurethane material disclosed by the invention is proper in component and dosage, so that the material formability is good, bubbles and flame retardant precipitation after the material is formed can be avoided, and the utilization rate of the flame retardant is increased.

A CaB2O4 / Pb3O4 / Mg3B2O6 / C nanocomposite that includes orthorhombic calcium metaborate (CaB2O4), tetragonal lead tetroxide (Pb3O4), magnesium borate (Mg3B2O6), and carbon (C). The CaB2O4 / Pb3O4 / Mg3B2O6 / C nanocomposite includes 55 to 70 atomic percent (at. %) oxygen (O), 5.0 to 12.5 at. % calcium (Ca), 7.5 to 15 at. % magnesium (Mg), 7.5 to 15 at. % lead (Pb), 2.5 to 7.5 at. % boron (B), and 2.5 to 7.5 at. % carbon (C), each based on a total number of atoms in the CaB2O4 / Pb3O4 / Mg3B2O6 / C nanocomposite. The nanocomposite is used in a method of removing organic pollutants and / or heavy metals from water.

A polymer comprising pyridinium salt moieties, wherein the polymer has the following structure: In this structure, R1 and R6 are each N. At least a portion of R2 and R7 groups in the polymer are each negatively charged counterions selected from the group consisting of carboxylates, nitrates, nitrites, azides, metasilicates, tetraborate, perborates, boronates, oxalatob orates, metaborates, phosphorus-containing anions, halides, sulfates, SO4 -2, HSO4 -1, thiosulfate, dithionite, metabisulfite, persulfate, methanesulfonate, dioctyl sulfosuccinate, 3-sulfopropyl ethoxylate laurylphenyl ether, and combinations thereof. R3, R4, R8, R9, R11, R13, R14, R15, and R16 are each selected from the group consisting of H and groups including one or more carbon atoms. R5 and R10 are any group including one or more carbon atoms. The n is an integer from 2 to about 100,000.

A method for producing organic microelement complexes based on humic acid salts is characterized in that an aqueous solution of lignosulfonate is mixed with dry or aqueous solutions of copper, zinc, manganese, iron, cobalt, ammonium molybdate sulfates, boric acid or potassium metaborate to achieve a total mass concentration of microelement ions in the range of 0.5-4.0% of the absolutely dry matter. An alkaline agent is added. The resulting working solution undergoes intensive mixing with cavitation treatment. The solution is loaded into a reactor, sealed, pressurized to 22 bar, and heated to 150°C. The synthesis of microelement complexes based on humic acid salts occurs for 120-150 minutes at a pressure of 22-23 bar, temperature of +170-180°C with an air flow rate of 60-80 1 / h passing through the reactor. The synthesis process is stopped when the pH drops below 8.5 by turning off the heating and air supply. The finished product is unloaded after natural cooling below 70°C. The invention enhances the stability of organic complexes based on humic acids with high concentrations of retained biogenic microelements.

The application discloses a kind of core-shell nanostructure magnesium hydride-magnesium borohydride hydrolysis hydrogen production materials and preparation method thereof.A kind of core-shell nanostructure magnesium hydride-magnesium borohydride hydrolysis hydrogen production material preparation method, comprising the following steps: magnesium hydride is loaded into ball mill jar vacuum, then borane gas is filled in ball mill jar, ball milling treatment is carried out, and the core-shell nanostructure magnesium hydride-magnesium borohydride hydrolysis hydrogen production material is obtained.The application uses solvent-free gas-solid reaction, ball milling method, simple, low cost;This composite method not only avoids the direct use of expensive magnesium borohydride, but also overcomes the shortcomings of other composite systems, and even improves the theoretical hydrogen release capacity;The in-situ formed magnesium borohydride nanoshell plays a key role in improving the hydrolysis kinetics of magnesium hydride by releasing heat and forming a local magnesium ion and metaborate ion solution environment.

The utility model provides a kind of controllable temperature field structure of large size low temperature phase barium metaborate crystal growth, solve the gradient heat demand in the process of BBO crystal growth that traditional fixed heat field cannot satisfy, its main scheme includes: furnace body and BBO seed crystal, the cavity is opened in the furnace body to place has crucible, the melt is built-in in the crucible, the BBO seed crystal is placed in the melt, and its top is connected to furnace body outside by vertical seed crystal stem, the inner wall of furnace body is fixed with two groups of heating elements on the corresponding BBO seed crystal place symmetrical formula, two groups of the heating element is symmetrical with the BBO seed crystal as center in height axial direction, and temperature measuring couple is set in the interval center between two to measure the temperature of inner cavity, the water cooling coil is also provided on the outside of corresponding heating element of furnace body, and the water cooling coil center height corresponds with the BBO seed crystal.

According to the epitaxial resistivity monitoring chip and the preparation method thereof, a solid boron source chip is adopted to react in a wet oxygen environment to generate metaboric acid, the metaboric acid is diffused to the surface of a silicon substrate and forms thin-layer borosilicate glass, boron atoms generated by decomposition of the metaboric acid are uniformly diffused into crystal lattices of the silicon substrate, and P-type thick boron doping is achieved; the method comprises the following steps: sequentially removing borosilicate glass and pollutants, carrying out dry oxygen environment boron doping source re-diffusion on a silicon substrate to form an oxide layer containing trace boron impurities, removing the oxide layer and pollutants, forming the oxide layer through reaction, and carrying out lattice repair and electrical property optimization to obtain the high-performance P well. And finally, a surface oxide layer and pollutants are removed, and preparation of the P-type monitoring sheet is completed. The method effectively solves the problem that in the prior art, an epitaxial resistivity monitoring piece cannot be repeatedly used, silicon substrate waste can be reduced, the detection precision of each time of use can be guaranteed, and the long-term stable monitoring requirement of the epitaxial process is met.

This invention discloses a method for preparing a dendritic copper oxide catalyst and its application in the electrocatalytic reduction of nitrate to ammonia. The method includes the following steps: S1, preparing aqueous solutions of metaborate and copper source compound using metaborate and a copper source compound respectively, then adding the aqueous solution of metaborate to the aqueous solution of copper source compound, stirring and dispersing to obtain an emulsion; S2, placing the obtained emulsion in a hydrothermal reactor and carrying out a hydrothermal reaction at a certain temperature to obtain the dendritic copper oxide catalyst. This invention utilizes BO2... ‑ Adjusting the microstructure and electronic structure of Cu-based oxide catalysts significantly improved the electrocatalytic performance of copper catalysts for NO3-. ‑ The technical effects of conversion for ammonia production: The prepared dendritic copper oxide catalyst exhibited excellent ammonia product selectivity and NH3 yield in the electrocatalytic nitrate reduction reaction.

The present application relates to the technical field of inorganic glass polishing powder preparation, in particular to a long-acting anti-abrasion glass polishing powder and a preparation method thereof. The present application overcomes the problems of traditional cerium-based polishing powder, such as easy settlement and pipeline blockage during processing, and lack of long-acting anti-abrasion protection after polishing. By in-situ combination and addition of sodium lignosulfonate and double-end epoxy polyethylene glycol in the precursor liquid, cross-linking reaction is carried out, and particle settlement is inhibited by steric hindrance and electrostatic repulsion. In addition, calcium metaborate or barium metaborate is added as a boron-containing fluxing component during pyrolysis and multiphase eutectic calcination, which locks the lamellar wear-reducing component in the inorganic skeleton, and integrates the cutting phase and the lubricating phase. Finally, the continuity of the processing flow is improved, and under the shear force, the glass surface migrates to form a film to play a dynamic lubrication role, effectively reducing the scratch width and inhibiting the rise of haze after long-term sand particle erosion.

The application discloses a method for efficiently capturing oxygen, in which anion functionalized ionic liquid containing Mo, W, B and V is used as an absorbent to absorb O2; during the absorption process, the absorption pressure is 0.02-0.1 MPa, the absorption temperature is 20-100 DEG C, and the absorption time is 2-8 h; the desorption process is carried out under 0.02-0.1 MPa, the desorption temperature is 70-120 DEG C, and the desorption time is 0.5-4 h; the functionalized ionic liquid is composed of alkyl quaternary phosphonium cation and molybdate, tungstate, metaborate and orthovanadate. The application realizes efficient and recyclable capture of O2 by using the coordination of O2 and anions, has the advantages of high absorption efficiency, large absorption capacity, wide use environment for absorption of O2, wide absorption temperature control range, and the like, and can reduce the viscosity of the system after absorption of O2, which is beneficial to desorption and recycling of O2.

This invention discloses a black hot spring bath concentrate, its preparation method, and its application, relating to the field of personal care products technology. It comprises component A, an active black hot spring concentrate, and component C, a sulfide and humic acid composite stabilization system. Component A must contain humic acid with a content of ≥500 mg / L metasilicic acid, 5-15 mg / L fluoride ions, ≥10 mg / L total hydrogen sulfide, ≥20 mg / L metaboric acid, and ≥100 mg / L total organic carbon. Component C consists of selenite, polyphenolic antioxidants, and metal ion chelating agents. This invention utilizes a low-temperature membrane enrichment-bioenzymatic hydrolysis coupling-nano-stabilization integrated technology to fully preserve the quaternary characteristic component spectrum of black hot springs ("metasilicic acid-fluoride-sulfide-humic acid"), and uniquely employs a composite stabilization technology targeting the dual-active system of "sulfide-humic acid." It can be stored for a long time at room temperature and pressure, exhibiting excellent physical stability and long-lasting efficacy, and demonstrating a clearly targeted therapeutic effect of black hot springs.

This invention discloses a self-healing grout for building structures and its preparation process, belonging to the field of building materials technology. The grout comprises cement-based cementitious materials and a self-healing solvent powder. The self-healing solvent powder is prepared by grafting furfural-furan-methanol oligomers onto the surface of silanized wollastonite, and then compounding it with a lithium tetraborate-glycerol complex under acidic conditions. The dry grout comprises silicate cement, quartz sand, fly ash, silica fume, an expanding agent, the self-healing solvent powder, and a high-efficiency water-reducing agent. This invention utilizes an organic-inorganic hybrid supramolecular cross-linked microparticle structure, which sequentially undergoes borate ester hydrolysis, coordination dissociation, wollastonite dissolution, and calcium metaborate precipitation and expansion during crack seepage, achieving efficient crack filling and repeated self-healing. It is independent of microorganisms, exhibits strong robustness to cement-based highly alkaline environments, and the repair products form chemical bonds with the matrix, significantly improving the long-term durability and mechanical recovery capacity of the grout.

[Problem] To provide: a catalyst which has high hydrogen generation efficiency; a method for producing the catalyst; a method for producing a reusable metaborate; a hydrogen generator which is provided with the catalyst; and a fuel cell system which is provided with the hydrogen generator. [Solution] According to one embodiment of the present invention, there is provided a catalyst which is used for the purpose of generating hydrogen from a borohydride salt and water, the catalyst containing a metal oxide as a main component and a metal boride which is supported by the metal oxide.