31results about How to "Reduce reactivity" patented technology

This application relates to the field of hydrosilylation, and in particular to a highly efficient catalyst for hydrosilylation reactions and its preparation method. This application provides a method for preparing a microcapsule-form catalyst, which first modifies methyl-terminated hydroxyl silicone oil with silazane, and then forms a microcapsule coating system with paraffin, thereby improving the release performance of the microcapsule coating system, so that the catalyst has low reactivity in the early stage of release, thereby improving the uniformity of the reaction process inside the silicone rubber, and thus improving the transparency and overall strength of the silicone rubber.

The utility model discloses a multifunctional restraining glove which comprises a glove body, a restraining belt, a grip ball and a tightening device, the glove body is integrally connected with finger separating sleeves of four fingers, a hole is formed in the position, corresponding to the ring finger, of the glove body, the end of each finger separating sleeve is open, and a groove is formed in the position, corresponding to the hand back, of the glove body. A grip ball is sewn and connected to the position, corresponding to the palm center, of the glove body, and an elastic rope is sewn between the side, facing the grip ball, of each finger separating sleeve and the grip ball. A finger ring is fixedly arranged at the end of each finger separating sleeve in a sleeved mode, a guide pipe is fixed to the bottom of the grip ball, four pulling ropes with different lengths penetrate through the guide pipe, one end of each pulling rope is fixed to one finger ring, the other ends of the four pulling ropes are movably fixed to a tightening device, and the tightening device is fixed to a binding belt. The glove has the advantages that the elastic rope of the glove body limits the moving space from fingers to the grip ball, so that the fingers are prevented from moving randomly while moving and exercising of the fingers are facilitated, and an infusion tube is prevented from being struggled off.

This invention discloses an acid and alkali resistant polyamide membrane and its preparation method. The method is as follows: S1: Immerse the ultrafiltration base membrane in an aqueous sodium hydroxide solution for soaking and then set aside; S2: Treat the base membrane with a mixed aqueous solution of polyamine and aziridine crosslinking agent; S3: Wet the base membrane in an organic phase solution of polyacrylamide monomer to obtain a polyamide composite membrane; S4: Immerse the prepared polyamide composite membrane in an alcoholic solution of hydroxymethyl crosslinking agent, then dry it in a forced-air drying oven, and after washing with water, obtain the acid and alkali resistant polyamide membrane. This application uses two crosslinking agents, aziridine and hydroxymethyl, which can undergo specific crosslinking reactions with the carboxyl groups inside the polyamide membrane, to directly perform dual crosslinking modification on the membrane interior and surface, without introducing other polymer materials to avoid excessive increase in membrane permeation resistance. The polyamide membrane prepared by this method has both good acid and alkali resistance and water permeability.

This invention discloses a method for microwave-catalyzed dehydrogenation of naphtha to produce aromatics, specifically comprising the following steps: Step 1, oxidizing and etching the surfaces of four different diameter carbon fibers to obtain four modified carbon fibers; Step 2, preparing four platinum-carbon fibers of different diameters based on the four modified carbon fibers obtained in Step 1; Step 3, preparing a gradient-pore structured platinum-carbon fiber paper based on the four different diameter platinum-carbon fibers obtained in Step 2; Step 4, using the gradient-pore structured platinum-carbon fiber paper obtained in Step 3 to catalyze the dehydrogenation of naphtha to obtain aromatics. This invention uses microwave-assisted catalysis to lower the reaction temperature, achieving localized catalytic heating to reduce side reactions, and also achieves high dehydrogenation efficiency.

The invention relates to the field of hydrosilylation, in particular to a high-efficiency catalyst for hydrosilylation and a preparation method thereof, and provides a preparation method of a microcapsule type catalyst, methyl-terminated hydroxyl silicone oil is modified by silazane, and then a microcapsule coating system is formed by the modified methyl-terminated hydroxyl silicone oil and paraffin. The release performance of a microcapsule coating system is improved, so that the catalyst has relatively low reaction activity at the initial release stage, the uniformity of the reaction process in the silicone rubber is improved, and the transparency and the overall strength of the silicone rubber are further improved.

The application discloses a kind of corrosion-resistant anti-aging plastic packaging barrels and preparation method thereof, belong to plastic product processing technical field, to solve the technical problems that corrosion resistance and anti-aging performance of plastic packaging barrel in prior art need to be further improved, specifically including the following raw material composition by portion: 60-70 parts modified silicone, 3-5 parts modified aging-resistant filler, 8-12 parts polypropylene, 12-18 parts maleic anhydride grafted polypropylene and 3-5 parts auxiliary additive, the application is that polypropylene, maleic anhydride grafted polypropylene, modified silicone, modified aging-resistant filler and auxiliary additive are added into double-screw melt extruder, melt extrusion, injection mold, obtain plastic packaging barrel, not only improve its corrosion resistance and anti-aging performance, also improve its mechanical properties.

The application provides an aluminum-doped hematite, a preparation method thereof and application of the aluminum-doped hematite in catalyzing degradation of organic pollutants by peroxide or removal of pathogenic bacteria. The preparation method of the aluminum-doped hematite comprises the following steps: adding a ferric salt and an aluminum salt into deionized water, precipitating the product after reaction, and then washing, drying and grinding the product to obtain a precursor; and then calcining the precursor, and then washing and drying the aluminum-doped hematite. The preparation method is simple, raw materials are cheap and easy to obtain, the cost is low, and the method is green, safe and environmentally friendly. The catalytic activity of the hematite is improved by introducing aluminum elements into the hematite, and the catalytic conditions are easy to realize. The aluminum-doped hematite has excellent ability of activating peroxide, and thus has excellent performance in removing environmental organic pollutants and sterilization.

The invention relates to the field of dyeing and finishing of bio-based fabrics by bio-based dyes, in particular to a method for dyeing polylactic acid / cotton blended fabrics, which comprises the following steps: mixing visible blue, sodium hydrosulfite, sodium carbonate, caustic soda and water, fully reducing and diluting to obtain visible blue dyeing liquid, adjusting the pH value to be acidic, then mixing with a dispersing agent and an accelerating agent, and uniformly stirring to obtain the polylactic acid / cotton blended fabrics. Immersing the polylactic acid / cotton blended fabric for dyeing treatment, and then performing color development treatment, soaping treatment and color fixation treatment. Aiming at the problem that the polylactic acid / cotton blended fabric is difficult to dye at present, the dyeing method for the polylactic acid / cotton blended fabric is provided, the microbial-sourced ornamental blue is selected as a dye, and the dyeing method has the advantages of being green, environmentally friendly and easy to combine with the polylactic acid / cotton blended fabric; meanwhile, according to the dyeing process, on one hand, the using amount of sodium hydrosulfite is reduced, so that pollution to the environment is reduced, and on the other hand, the dyeing temperature and time are reduced, the energy consumption is reduced, and the dyeing efficiency is improved.

This invention discloses a heterocyclic polyarylamide-polyhydroxyarylamide precipitated fiber, its preparation method, and a heterocyclic polyarylamide-polybenzodioxazole paper, belonging to the technical field of high-performance organic fiber and paper preparation. The preparation method of the precipitated fiber includes the following steps: A. Preparation of the polymerization solution: 3,3'-dihydroxybenzyl diamine (DHB) and 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) are dissolved in an organic solvent containing a solubilizing salt, and then terephthaloyl chloride is added to react and obtain a polymer solution with a solid content of 1-10%; B. Precipitation: After degassing, filtering, metering, and spinning, the polymer solution is mixed with a coagulation bath and precipitated to obtain the heterocyclic polyarylamide-polyhydroxyarylamide precipitated fiber. A heterocyclic polyarylamide-polybenzodioxazole paper prepared from this precipitated fiber is also provided. This invention introduces a heterocyclic polyaromatic amide structure through copolymerization, which not only improves the strength and composite properties of the cyclized PBO paper, but also maintains a decomposition temperature comparable to that of pure PBO fiber, exceeding 600℃, demonstrating excellent thermal stability. Furthermore, this method is simple and easy to implement, making it suitable for industrial production applications.

This invention belongs to the field of heterocyclic pharmaceutical intermediate synthesis technology, specifically disclosing a method for synthesizing N-alkoxycarbonyl-4-amino-4-alkylpiperidine. Using N-alkoxycarbonylpiperidine-4-carboxylate as the starting material, the target product is obtained through a four-step reaction involving alkylation, hydrolysis, amidation, and Hoffmann rearrangement. This invention, through the adaptation and control of the substrate, synthetic route, and synthetic conditions, can solve the problems existing in the substrate-based synthetic route, thereby improving product yield and quality. The method described in this invention achieves a total yield of ≥60% of the target product, with key impurities all <0.1%. The process is safe and controllable, suitable for both laboratory-scale and industrial-scale production.

The application belongs to the field of ceramic powder preparation, and discloses a method for in-situ preparation of high-performance TiB2-B4C composite ceramic from sapphire fine grinding waste. The method uses the waste produced in the sapphire grinding process as raw material (B4C, Al2O3 and Fe), adds TiO2 and C after alkali washing and purification, and combines with the discharge plasma sintering to in-situ prepare TiB2-B4C composite ceramic. The method not only realizes the comprehensive recovery of B4C in the sapphire fine grinding waste slurry, reduces environmental pollution, but also provides a method for in-situ preparation of TiB2-B4C composite ceramic from waste, changes waste into treasure, and realizes the secondary use of resources. In addition, the raw material cost is low, and the method has obvious economic value and environmental protection significance. The method has the advantages of short process, small pollution, simplicity and the like, and can be used for industrial production.

The application discloses a composite diaphragm for lithium ion batteries, a preparation method of the composite diaphragm and a lithium ion battery. The composite diaphragm comprises a porous base diaphragm, a first microcapsule coating layer coated on a first surface of the porous base diaphragm and a second microcapsule coating layer coated on a second surface of the porous base diaphragm. The first microcapsule is composed of a lithium source compound core material and a polymer wall material coated outside the lithium source compound core material, and the second microcapsule is composed of a lithium-poor active material core material and a polymer wall material coated outside the lithium-poor active material core material. The softening temperature of the polymer wall material is in the range of 90 DEG C to 230 DEG C. When the temperature of the battery reaches a set trigger temperature, the lithium source compound on the first surface side releases lithium to be inserted into a delithiated positive electrode to reduce the positive electrode potential, and the lithium-poor active material on the second surface side releases lithium to be inserted into a lithium-inserted negative electrode to increase the negative electrode potential, so that the battery state of charge is reduced, and chemical intervention is completed before thermal runaway.

The application discloses a method for preparing battery-grade ferrous oxalate from lithium extraction residue of lithium iron phosphate, and belongs to the technical field of lithium iron phosphate recycling. The method comprises the following steps: acid leaching of lithium extraction residue of lithium iron phosphate, impurity removal and purification of iron-phosphorus solution, pre-regulation of phosphorus form, directional coordination synthesis of ferrous oxalate, graded washing and phosphorus solidification, crystal form stabilization and drying. The application realizes pre-regulation of the phosphorus form, adds a complexing agent into the purified iron-phosphorus solution, forms stable phosphorus complexes with the complexing agent and free HPO4 2‑ , reduces the reactivity of the complexes with Fe 2+ , and inhibits the generation of FeHPO4 impurities from the source. The application realizes preferential coordination of oxalate and Fe 2+ through directional coordination synthesis, realizes deep removal of residual phosphorus through graded washing, and prevents adsorption of phosphorus elements in the process of crystal form transformation through crystal form stabilization.

The present application relates to the technical field of epoxy resin adhesive, in particular to a long applicable period dual-curing interpenetrating network type one-component epoxy resin adhesive, a preparation method and application, the adhesive is composed of 100 parts of E-51 epoxy resin, 15-35 parts of modified imidazole curing agent, 10-40 parts of active diluent, 0.2-2.0 parts of free radical polymerization initiator by weight fraction; The modified imidazole curing agent has the functions of latency and toughening. The one-component epoxy adhesive of the present application has a long room temperature storage period, which can reach 570-632 hours; only heating is needed to simultaneously realize free radical polymerization curing and thermal curing, forming an interpenetrating network type resin material with high strength and high toughness; there is no strict requirement for raw materials and packaging substrates, overcoming many defects existing in traditional dual-curing epoxy adhesives.

The application provides a preparation method of a boron-nitrogen compound, and the preparation method comprises the following steps: a coupling reaction of a raw material benzoindole derivative and bromo-chloro-fluorobenzene to obtain an intermediate compound, reaction of the intermediate compound with an aryl boronic acid compound, then a coupling reaction with a carbazole compound, and then a lithiation-boronization-cyclization reaction to obtain a boron-nitrogen compound of formula I. The synthesis method has the advantages of high yield and easy purification of the product.

This invention provides an enhanced chlorine-resistant reverse osmosis membrane, comprising a base layer, a polyamide layer, and a polymeric protective layer. The polyamide layer is disposed on the base layer, and the polymeric protective layer is disposed on the polyamide layer. The polyamide layer is formed by interfacial polymerization of a diamine aqueous phase and a polyacrylamide oil phase. The solute in the diamine aqueous phase includes common amines and specific diamines, and the specific diamine includes at least one selected from 2-methyl-p-phenylenediamine, 4-methyl-1,3-phenylenediamine, 2,6-diaminotoluene, and 2,4,6-trimethyl-1,3-phenylenediamine. The polymeric protective layer is connected to the surface of the polyamide layer through polyaldehyde molecules. This invention, through the combination of the base layer, the polyamide layer, and the polymeric protective layer, enables the enhanced chlorine-resistant reverse osmosis membrane to achieve both a high desalination rate and excellent chlorine resistance.

The invention relates to the technical field of film materials, and discloses a high-pressure-resistant polyamide composite film as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) adjusting the pH value of a water-phase solution containing multifunctional amine and organic acid to 5-6.5; the preparation method comprises the following steps: dissolving multifunctional acyl chloride, phosphate and isocyanate in a non-polar solvent to prepare an oil phase solution; (2) applying a water-phase solution to the base membrane, and then contacting with an oil-phase solution to carry out interfacial polymerization reaction; and (3) after the interfacial polymerization reaction is finished, carrying out heat treatment at the temperature of 60-100 DEG C, thereby obtaining the product. The organic acid is introduced into the water phase to regulate and control the pH value, so that the reaction rate of amine and acyl chloride is slowed down; phosphate in the oil phase is matched to reduce the activity of acyl chloride, so that the polyamide layer uniformly grows and the crosslinking degree of the polyamide layer is improved; meanwhile, isocyanate is introduced into a nascent state polyamide network, so that the crosslinking degree and the stability of polyamide are further enhanced, and the obtained composite membrane can still keep excellent water flux under high pressure.

This application discloses a cathode material, its preparation method, and an all-solid-state battery. It includes a substrate and a first coating layer and a second coating layer sequentially coated on the surface of the substrate. The substrate is a phosphorus-doped spinel-type lithium nickel manganese oxide. The first coating layer includes an oxygen-doped halide electrolyte. The second coating layer includes an Sb / O co-doped argentite-germanium sulfide. The cathode material provided by this application has the advantage of synergistically improved structural stability, interfacial stability, and air stability.

The invention discloses a method for preparing a barium titanate functional coating by a one-step method, which comprises the following steps of: 1, adding barium hydroxide octahydrate serving as a barium source into excessive glacial acetic acid, heating in a constant-temperature water bath, stirring until the solution is clear and transparent, and cooling to room temperature to obtain a solution A with the pH value of 5.0-6.8; 2, adding tetrabutyl titanate serving as a titanium source into absolute ethyl alcohol, and uniformly stirring to obtain a solution B; 3, dropwise adding the solution B into the solution A in a room-temperature stirring state; after the solution B is dropwise added, continuously stirring, mixing and aging to obtain a barium titanate precursor solution; fourthly, the metal material serves as a base body and is pretreated, and a pretreated base body is obtained; and (5) spraying the barium titanate precursor solution obtained in the step (3) onto a pretreated substrate through a solution plasma spraying process to prepare the barium titanate functional coating. The method is simple in process, and the obtained coating is uniform in component and has certain density and dielectric property while having relatively good hardness.

The application belongs to the technical field of synthesis of heterocyclic medicinal intermediates, and specifically discloses a synthesis method of N-alkoxycarbonyl-4-amino-4-alkylpiperidine, which takes N-alkoxycarbonylpiperidine-4-carboxylate as a starting material, and obtains a target product through four steps of alkylation, hydrolysis, amidation and Hofmann rearrangement. Through the adaptation control of the substrate, the synthesis line and the synthesis conditions, the application can solve the problems existing in the synthesis line of the substrate, so that the yield of the product can be improved, and the quality of the product can be improved. The total yield of the target product is greater than or equal to 60%, the key impurities are all less than 0.1%, the process is safe and controllable, and is suitable for laboratory small test and industrial amplification.

This invention discloses an environmentally friendly bio-based polyurethane reaction injection molding composition and its preparation method. The environmentally friendly bio-based polyurethane reaction injection molding composition comprises, by mass fraction: Component A: 60-90% modified polyol, 3-10% autocatalytic chain extender, 4-15% alcohol chain extender and / or alkanolamine chain extender, 1-8% carbon black, 1-5% anti-aging agent, and 0.05-2% composite catalyst; Component B: 60-90% diphenylmethane diisocyanate or 4,4'-dicyclohexylmethane diisocyanate, 10-40% jojoba oil polyol; isocyanate (NCO) content 16%-30%; the modified polyol includes 500-1000 parts by weight of polyether polyol, 40-70 parts by weight of jojoba oil polyol, and 25 parts by weight of isocyanate. The prepared composition can shorten the demolding time by 10-25% while keeping the gel time constant, which can meet the requirements of rapid injection and demolding. At the same time, it shortens the production cycle and improves production efficiency. Its performance is comparable to that of existing technologies, and it enables renewable bio-based polyols to partially replace petrochemical-derived polyols.

The application provides a fuel cell membrane electrode activation method, and specifically comprises the following steps: (1) installing a fuel cell on a test bench, setting an anode gas as hydrogen, setting a cathode gas as nitrogen, purging the hydrogen and the nitrogen to the anode and the cathode respectively, and pre-humidifying the fuel cell; (2) controlling the temperature of the fuel cell to be 30-60 DEG C, and ensuring the relative humidity RH of the cathode and the anode of the fuel cell to be greater than or equal to 100% through pre-humidification; (3) replacing the cathode gas from nitrogen with air, performing forced discharge treatment on the fuel cell under the condition that the hydrogen metering ratio is 1.0-2.0 and the air metering ratio is less than or equal to 1.3, and operating the fuel cell at a constant voltage less than or equal to 0.3 V to activate the fuel cell membrane electrode. The technical scheme of the application solves the problems of long time consumption, incomplete activation, low catalyst utilization rate and large energy consumption in the existing fuel cell membrane electrode activation method.

The application discloses long-acting stable silica for a two-component epoxy system and a preparation method thereof. Firstly, a silicon hydrogen group is introduced to the surface of fumed silica by treating the surface of the fumed silica with triethoxysilane; then, the silicon hydrogen group is subjected to a hydrosilylation addition reaction with vinyl-terminated polydimethylsiloxane (PDMS) to form a PDMS flexible steric hindrance layer; finally, the PDMS flexible steric hindrance layer is subjected to a hydrosilylation addition reaction with hexadecyldimethylhydrosilane to introduce a hexadecyl long chain as an anchoring arm. The long-acting stable silica obtained by the application exhibits excellent hydrophobicity and long-term compatibility in the two-component epoxy system, effectively solves the technical problems of viscosity reduction and sedimentation of the existing epoxy system, and has a wide application prospect in the fields of adhesives, coatings, electronic packaging and the like.

The application belongs to the technical field of lithium ion batteries, and discloses a ternary high-nickel lithium ion battery nonaqueous electrolyte and a lithium ion battery containing the electrolyte. The ternary high-nickel lithium ion battery nonaqueous electrolyte contains a nonaqueous organic solvent, an electrolyte lithium salt and an additive, the additive contains a sulfur-containing additive and other film-forming additives, the structure of the sulfur-containing additive is shown in formula (I), and the high-nickel lithium ion battery nonaqueous electrolyte is optimized in formula, and under the joint action of a plurality of components in a unique combination, the electrolyte system has high energy density and long service life, and is beneficial to meeting the demand of the electrolyte on cycle performance and high-temperature storage performance in the high-nickel system.

The invention provides a novel process route for preparing perfluorohexane (C6F14), and the preparation method comprises the following steps: diluting fluorine gas with inert gas to obtain first mixed gas, and mixing hexafluoropropylene dimer (C6F12) with perfluorinated liquid to obtain first mixed liquid; the first mixed gas and the first mixed solution are treated through a microchannel reactor and then transferred into a reaction kettle, a product in the reaction kettle is collected, the product is separated, and the crude perfluorohexane product is obtained. The problems that in the prior art, the C6F14 preparation process is complex, and the conversion rate is low are solved. On the other hand, the invention discloses a purification method for obtaining a high-purity C6F14 finished product. The conversion rate and the purity of the perfluorohexane obtained by the scheme of the invention are obviously improved.

The application relates to the field of building materials, and particularly discloses a coal gangue activation treatment method, calcined coal gangue prepared by the method and application, the treatment method comprises the following steps: pretreatment: crushing and screening coal gangue to obtain coal gangue particles; pretreatment: treating the coal gangue particles in a eutectic solvent, and performing ultrasonic auxiliary treatment for 2-3 hours, and obtaining pretreated coal gangue after washing, the eutectic solvent comprises HBA components and HBD components, the HBA components are selected from a mixture of choline chloride and an amide compound, and the HBD components are selected from a mixture of a carboxylic acid compound and a polyhydric alcohol mixture; calcination: calcining the pretreated coal gangue at 400-450 DEG C to obtain calcined coal gangue, and the application further discloses the calcined coal gangue prepared by the method, and the application has the characteristics of realizing coal gangue activation treatment at a lower energy consumption.

It is an object of the present invention to provide a graphene material that is lightweight, has a large retention capacity, and is useful as a base material for sustainedly releasing a non-aqueous component, and a method of producing the same. Provided is a graphene material having a total porosity of 60.0% or more and an open porosity of 50.0% or more.

The invention belongs to the technical field of potassium ion batteries, and particularly relates to a medium-entropy potassium ion battery positive electrode material with high air stability, a preparation method of the medium-entropy potassium ion battery positive electrode material and a potassium ion battery, the medium-entropy potassium ion battery positive electrode material is a ferromanganese-based layered oxide, the chemical general formula of the medium-entropy potassium ion battery positive electrode material is KxMnyFezM1-y-zO2, x is larger than or equal to 0.45 and smaller than or equal to 0.8, and y + z is larger than or equal to 0.7 and smaller than or equal to 0.85; and M is a combination of six or more doping elements of Al, Sn, Mg, Cu, Ni, Co, Sb, Cr, V, Ti and Zn. The potassium ion battery positive electrode material provided by the invention is low in production cost and simple in preparation process, can effectively inhibit structural degradation generated after the reaction with air components, can maintain the stability of a crystal structure after being exposed in a high-humidity air environment for a long time, and can be applied to the field of lithium ion batteries. And the initial discharge specific capacity and the cycle stability of the battery are maintained.

The application provides a water plugging agent and a preparation method thereof. The preparation method of the water plugging agent comprises the following steps: 1) uniformly mixing water, a first chelating agent, a polymerization monomer, a primary crosslinking agent, an initiator and an accelerator to obtain liquid A; 2) uniformly mixing water, a second chelating agent, a crosslinked polymer, a secondary crosslinking agent and a stabilizer to obtain liquid B; and 3) uniformly mixing liquid A and liquid B to obtain the water plugging agent.

The application discloses a kind of tetrazole-containing aqueous zinc ion battery electrolyte and its preparation method and application.The application introduces 0.2 wt%~1.0 wt% tetrazole into 3M ZnCl2 aqueous electrolyte, multiple nitrogen atoms containing lone pair electrons in tetrazole molecule can be preferentially coordinated with zinc ions, replace active water molecules around it, and at the same time, using the natural zincophilic property of organic molecules, it is adsorbed on the surface of zinc negative electrode to form a stable solid electrolyte interface film (SEI), realizing uniform zinc electrodeposition. The optimal proportion of 1.0 wt% tetrazole addition amount can make the aqueous zinc ion battery have the optimal electrochemical performance and long cycle stability. The electrolyte preparation method of the application is simple, without complex equipment and harsh conditions, easy to scale production, and has broad application prospect.