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41results about How to "Moderate reaction rate" patented technology
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Alpha/beta-bismuth oxide phase heterojunction photocatalyst as well as preparation method and application thereof
ActiveCN106732524AEfficient degradationEfficient removalWater/sewage treatment by irradiationWater treatment compoundsHeterojunctionSource material
The invention provides an alpha / beta-Bi2O3 phase heterojunction photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: firstly dissolving 2-4mmol of a bismuth source material in 70mL of a reductive solvent, magnetically stirring for 30 minutes under the room temperature, then adding 0-2.0mL of aniline into the solution, and continuing to stir for 10 minutes; transferring the mixed solution into a reactor, putting the mixed solution in a drying oven for carrying out solvothermal reaction for 8-12 hours at the temperature of 150-180 DEG C to obtain a bismuth-based precursor; washing, drying and grinding the precursor, putting the precursor in a muffle furnace for calcining for 0.5-2.0 hours at the temperature of 300 DEG C to obtain yellowish green powder which is the alpha / beta-Bi2O3 phase heterojunction photocatalyst. The prepared alpha / beta-Bi2O3 phase heterojunction photocatalyst is used for degrading organic pollutants in water; compared with commercial TiO2 (P25), pure-phase alpha-Bi2O3 and pure-phase beta-Bi2O3 photocatalysts, the alpha / beta-bismuth oxide phase heterojunction photocatalyst has higher visible-light catalytic activity.
Owner:YUNNAN UNIV
Method for obtaining large-hole-diameter double-through-hole AAO membrane
The invention discloses a method for obtaining a large-hole-diameter double-through-hole AAO membrane. The method comprises the following steps that 1, aluminum foil is pretreated, and thus aluminum foil with the surface being as smooth and flat as a mirror is obtained; 2, a large-hole-diameter single-through-hole AAO membrane with an aluminum base and a blocking layer is prepared through a secondary anodic oxidation method, wherein an anodic oxidation electrolyte is a mixed solution of phosphoric acid (with the content being 0.05 M-0.2 M) and sodium oxalate (with the content being 0.01 M-0.03 M); and 3, the aluminum base and the blocking layer of the large-hole-diameter single-through-hole AAO membrane are removed through a corrosion stripping method, wherein aluminum base corrosive liquid is a mixed solution of copper chloride (with the content being 0.1 M-0.15 M) and ferric chloride (with the content being 0.15 M-0.18 M). The method has the advantage that the double-through-hole AAO membrane which is large in hole diameter, orderly in hole arrangement, large in area and good in integrality is obtained.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Preparation method of superconductive Josephson junction
ActiveCN108110131ARealize mass productionSimple processSuperconductor detailsDissimilar materials junction devicesEvaporationColloid
The present invention discloses a preparation method of a superconductive Josephson junction. belonging to the field of superconducting circuit elements. The method comprises the steps of: 1) performing preprocessing of a substrate, and obtaining a clean substrate; 2) performing electron beam exposure: coating electron beam glue on the substrate, and employing an electron beam exposure device to expose an area A and a area B on the substrate, wherein an area C is arranged at the intersection of the area A and the area B; 3) performing development: putting a container holding developing solventinto liquid, monitoring a temperature of the developing solvent, immersing the substrate obtained in the step 2) into the developing solvent and performing shaking development when the temperature ofthe developing solvent reaches a fitting temperature and is stably remained at the temperature, and then performing fixing, and allowing a figured formed by the electron beam glue to be stabilized; 4) performing inclined evaporation coating twice; 5) performing metal peeling. The preparation method of the superconductive Josephson junction employs an electron beam exposure mark technology and anelectron beam coating and metal peeling technologies, is relatively simple in process, avoids a complex suspension colloid preparation process and can perform batch preparation of superconductive Josephson junction samples in one day.
Owner:ORIGIN QUANTUM COMPUTING TECH (HEFEI) CO LTD
Method for preparing mesophase pitch through hydrogenation upgrading and co-carbonization of FCC (Fluid Catalytic Cracking) decant oil
InactiveCN107312561AImprove spin performanceReduce usageWorking-up pitch/asphalt/bitumen by chemical meansFiberCarbon fibers
The invention provides a method for preparing a petroleum-based mesophase pitch with high anisotropic structure content and low softening point. The method comprises the following steps: conducting reduced pressure distillation on an FCC (Fluid Catalytic Cracking) decant oil of a naphthenic crude, taking a cut fraction with the boiling point of 400-540 DEG C as a raw material, and reacting for 1-8 hours at the temperature of 400-460 DEG C and under the pressure of 4 MPa to obtain a petroleum pitch; then adding a hydrogen donor, reacting under condition of the self-generated pressure at the temperature of 380-450 DEG C at the initial nitrogen pressure of 5 MPa, then reducing the pressure to the normal pressure, cooling to 340 DEG C, and blowing with high-purity nitrogen for 0.5 hour to obtain a hydrogenated pitch; finally adding a co-carbonization additive, and reacting for 2-16 hours at the temperature of 400-480 DEG C at the pressure of 4MPa to obtain the high-quality mesophase pitch. The preparation process is simple, the production cost is low, the anisotropic structure content (more than 98%) of the prepared mesophase pitch is high, the softening point (230-270 DEG C) is low, the spinning property is good, and the mesophase pitch is an excellent precursor for preparing a high-modulus carbon fiber.
Owner:QINGDAO UNIV OF SCI & TECH
Neutral plug removal treating agent and preparation method thereof
The invention provides a neutral plug removal treating agent and a preparation method thereof. The neutral plug removal treating agent comprises the following components in percent by mass: 5 to 12 percent of an antiscaling agent, 0.5 to 1 percent of a synergist, 0.5 to 2 percent of a dispersing agent, 0.5 to 2 percent of a regulator, 5 to 10 percent of a cosolvent, and the balance of water. The neutral plug removal treating agent has the advantages that acidic materials are not added or produced during the whole process, wax, colloid and asphaltene covering the surface of sediments can be removed under a neutral low-temperature condition, and the neutral plug removal treating agent is neutral, non irritant, low-corrosion, low in transportation risk, and mild in plug removal reaction, effectively removes indissolvable inorganic scales, such as sulfate and carbonate, and achieves the purposes of elimination of transportation operation risk, reducing of tubular column corrosion rate, protection of a reservoir framework structure and improvement of the success rate of measures.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Alumina thin film and preparation method and application thereof
ActiveCN102787309ALow thermal decomposition temperatureLow heat treatment temperatureTransistorSolid/suspension decomposition chemical coatingIonDissolution reaction
The invention discloses a preparation method of an alumina thin film in the field of a thin film transistor. The preparation method comprises the following steps of: preparing aluminium precursor solution, i.e., dissolving a precursor material containing aluminium metal ions and a stabilizer in solution and sufficiently stirring to sufficiently dissolve the precursor material and the stabilizer to obtain the precursor solution; and preparing the alumina thin film, i.e., coating the prepared reaction solution on a coating surface to form a film and carrying out heat treatment program to obtain the alumina thin film. The invention also relates to the alumina thin film prepared by the preparation method and application of the alumina thin film in the transistor. The application comprises the thin film transistor of the alumina thin film and a preparation method of the thin film transistor. According to the preparation method of the alumina thin film, which is disclosed by the invention, by adding a right amount of stabilizer for stabilizing an alumina precursor material, a metal organic complex is formed by the precursor material of aluminium through the coordination dissolution reaction; the complex can be well dissolved in the solution and has low thermal decomposition temperature; and the heat treatment temperature in the preparing process is reduced.
Owner:TSINGHUA UNIV +2
Rigid polyurethane foam and preparation method thereof
The invention discloses a rigid polyurethane foam and a preparation method thereof. The preparation method of the rigid polyurethane foam comprises the following steps: premixing 100 parts by weight of hyperbranched polyurethane polyol with 1-10 parts by weight of foam stabilizer, adding 100-250 parts by weight of organic isocyanate or modified isocyanate to the pre-mixture and then curing at 30-100 DEG C for 12 hours to 3 days, thus obtaining the rigid polyurethane foam, wherein the hyperbranched polyurethane polyol is prepared by use of the following steps: reacting a polyhydroxylated compound with a diisocyanate monomer to obtain a first-generation hyperbranched prepolymer; on the basis of the isocyanate group content of the first generation hyperbranched prepolymer, adding the polyhydroxylated compound again and reacting to obtain the hyperbranched polyurethane polyol. The rigid polyurethane foam prepared by use of the method is high in strength, good in temperature resistance, good in dimensional stability and low in heat conductivity coefficient, and can be applied to the fields of thermal insulation, gap filling and supporting, wood-imitation materials and the like.
Owner:SOUTHWEST PETROLEUM UNIV
Method and device for simultaneously catalytic-generating hydrogen in waste battery recycling process
PendingCN109573943AMethod environmentally friendlyModerate reaction rateHydrogen productionWaste accumulators reclaimingHigh concentrationHydrogen
The invention relates to a method and device for simultaneously catalytic-generating hydrogen in a waste battery recycling process. The method mainly comprises the following steps: (1) extracting graphite: breaking a negative electrode sheet and placing in a reactor, adding hot water, wherein a water level is higher than a primary filter screen, to obtain graphite slurry; (2) preparing a catalyst:through an excessive volume impregnation method, enabling the graphite fallen from a negative electrode to be prepared as the Ni / C catalyst, wherein nickel salt needs to be added in process; (3) catalytic-generating hydrogen: placing the Ni / C catalyst and a positive electrode sheet on the primary filter screen, and adding high-concentration dissolution liquid for dissolving and generating hydrogen, wherein a liquid level is higher than filter screen; and (4) recycling a residual substance: recycling the catalyst on the primary filter screen, wherein the slurry is a positive electrode materialand aluminiferous solution which can be used for a next step of a battery recycling technology, and a collected gas is the hydrogen. The method aims to deeply exploit potentialities of a waste battery, recycle the negative electrode graphite, and simultaneously catalytically prepare the clean energy hydrogen, and a normal flow and recycling efficiency of battery recovery are not affected.
Owner:CHINA AUTOMOTIVE TECH & RES CENT +1
Preparation method of epoxy quaternary ammonium salt
The invention relates to a preparation method of an epoxy quaternary ammonium salt. The method includes: taking epichlorohydrin as a quaternization reagent for reaction with alkyl dimethyl tertiary amine in an organic solvent at 30DEG C-45DEG C for 2-8h. The epoxy quaternary ammonium salt prepared by the method has good quaternization rate and epoxy value, the product purity is greater than or equal to 90%, and the epoxy group content can reach up to about 27%, thus being more beneficial to subsequent modification combination with gelatin. According to the method disclosed by the invention, the conversion rate can reach 80-90% within 4-6h at a low reaction temperature, and the reaction rate is moderate.
Owner:QILU UNIV OF TECH
Catalytic depolymerization of PET under microwave irradiation
InactiveCN101066905AHeating up fastLower activation energyOxygen-containing compound preparationOrganic compound preparationOrganic acidDepolymerization
The present invention is one kind of environment friendly catalytic depolymerization process of polyglycol telephthalate under microwave irradiation with mild reaction condition. The present invention features that in the presence of salt of organic acid as catalyst, polyglycol telephthalate and water as reaction medium in certain weight ratio are reacted at 100-200 deg.c temperature and 0-1.3 MPa pressure under microwave irradiation, so that polyglycol telephthalate is depolymerized into telephthalic acid and glycol.
Owner:WENZHOU UNIVERSITY
Method and device for safety treatment on lithium ion battery before recovery and recycling, and lithium ion battery safe recovery method
ActiveCN106941199AAvoid enrichmentImprove securityWaste accumulators reclaimingBattery recyclingRecovery methodReaction rate
The invention relates to a method and device for safety treatment on a lithium ion battery before recovery and recycling, and a lithium ion battery safe recovery method. The method for safety treatment comprises 1) placing an open lithium ion battery or cell in a sealed cavity, and carrying out vacuum pumping on the sealed cavity, and 2) adding an immersion liquid into the sealed cavity, carrying out immersion treatment, wherein the immersion liquid is a mixed solution of water-soluble organic matters and water according to a mass ratio of (3-19): 1, and discharging the immersion waste liquid. The method for safety treatment utilizes the mixed solution of water-soluble organic matters and water as a treatment liquid so that a residual lithium reaction rate in water and cell is reduced, enrichment of flammable gas such as H and heat is avoided and safety is high. The method can realize thorough elimination of residual lithium and LiPF6. The treated battery or cell can be dismantled or crushed without a protection atmosphere so that safety and dismantling efficiency of the later cell dismantling and recovery processes are improved.
Owner:CHINA AVIATION LITHIUM BATTERY LUOYANG
Low-cost N type double-side battery preparation method
ActiveCN109301030AThe printing process is simpleEtch stopFinal product manufactureSemiconductor devicesChemical platingSlurry
The invention relates to a low-cost N type double-side battery preparation method. The method comprises the following steps of (1) cleaning and texturizing; (2) boron and phosphorus diffusion; (3) polishing, etching, and BSG / PSG removing in the back side; (4) deposition of alumina in the front side; (5) deposition of SiNx in the front and back sides; (6) laser grooving in the front and back sides;(7) pickling; (8) activation; (9) chemical plating of Ni; (10) chemical silvering; (11) annealing; and (12) laser edging and photoelectric processing. According to the method, the application amountof silver slurry is reduced greatly, the cost of silver slurry is reduced by more than 70%, a metal grid line is thinner, the shading area is small, and the conversion efficiency is higher.
Owner:常州顺风太阳能科技有限公司
Modified calcium oxide expanding agent for shrinkage-compensating concrete and preparation method of agent
The invention relates to a modified calcium oxide expanding agent for shrinkage-compensating concrete. The agent is obtained by conducting mixing and ball milling on 0.1-20% by mass of modifier and 80-99.9% by mass of calcium oxide expanding agent; the calcium oxide expanding agent is an expanding agent containing free calcium oxide, and the free calcium oxide serves as a stable expansion source playing an expansion role; the modifier is prepared from one of or multiple substances of sodium sulfate or a crystalline hydrate thereof, ammonium sulfate or a crystalline hydrate thereof, ammonium bisulfate or a crystalline hydrate thereof, sodium sulfite or a crystalline hydrate thereof and ammonium sulfite or a crystalline hydrate thereof. The modified expanding agent can lower the early hydration rate of the expanding agent, reduce expansion energy loss in the concrete plastic stage, increase the expanding rate and reduce the contribution degree of the expanding agent to concrete temperature rise at the same time, the phenomenon that the concrete setting time is affected can be avoided, and the slump degree and expansion degree of concrete cannot be lowered. The preparation method is simple, batch production can be conducted, and no toxic dangerous goods are used as raw materials.
Owner:海南胜凯建材有限公司
Method for producing iron oxide yellow
The invention discloses a method for producing iron oxide yellow. The method comprises the following steps: S1: adding calcium carbonate and water into a container; introducing air, and stirring; S2: adding ferrous chloride into the container, wherein the adding ratio of the calcium carbonate to the ferrous chloride is equal to or greater than the stoichiometric ratio of the calcium carbonate to the ferrous chloride; S3: heating a solution to be 80 DEG C to 85 DEG C; continually blowing the air in a process until the solution reacts to a needed color; carrying out thermal insulation for 30min to 60min, and discharging; S4: adding a diluted hydrochloric acid solution after discharging, so as to remove the calcium carbonate; S5: rinsing, carrying out press filtering, drying, crushing, and packaging to obtain a finished product. The method disclosed by the invention has the effects that the preparation method is simple, and the color consistency is good.
Owner:杭州金丰环保科技有限公司
Catalyst for preparing oxygen from hydrogen peroxide, as well as preparation method and experiment method of catalyst
InactiveCN104667981AGood effectNo pollution in the processOrganic-compounds/hydrides/coordination-complexes catalystsOxygen preparationChemical reactionReaction rate
The invention relates to a catalyst for preparing oxygen from hydrogen peroxide. The catalyst is prepared from the following components in parts by weight: 40-55 parts of agar, 20-40 parts of manganese dioxide, 100-120 parts of purified water, 4 parts of kaolin, 2 parts of silica gel, 1.5 parts of aramid fiber and 2 parts of stearic acid. Multiple experiments prove that the chemical reaction can be smoothly and lastingly carried out; the reaction rate is moderate; the effect is good; the requirements of demonstrative experiments and student experiments can be met completely; reacted liquid is still clear and transparent, and can be directly discharged after solids are filtered; and pollution is basically not generated.
Owner:鲁昱瑶 +1
Preparation method of slump-proof polycarboxylate superplasticizer
ActiveCN108084358ALower melting temperatureLow reaction temperatureBulk polymerizationTransport time
The invention provides a preparation method of a slump-proof polycarboxylate superplasticizer. The slump-proof polycarboxylate superplasticizer is prepared by bulk polymerization. The preparation method comprises the steps of (1) mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, stirring well at controlled temperature of 40-60 DEG C, and adding an initiator and a mixture ofunsaturated carboxylic acid, unsaturated carboxylates and a chain transfer agent; (2) curing for 0.5-1 hour after completion of step (1), and cooling to obtain the slump-proof polycarboxylate superplasticizer. The bulk polymerization is performed at relatively low temperature, the conditions are mild, operability is high, and the synthesized polycarboxylate superplasticizer has high water-reducingproperty. The polycarboxylate superplasticizer prepared herein is in liquid state at normal temperature, having an effective concentration of 100% and good stability of storage performance; the polycarboxylate superplasticizer is applicable to long-range transport and use; the polycarboxylate superplasticizer has excellent slump-proof performance; the problem can be solved that concrete slumps due to high temperature and long transport time; the polycarboxylate superplasticizer has a promising industrial application prospect.
Owner:JIAHUA CHEM MAOMING
High-elasticity environment-friendly polyvinyl chloride material composition as well as preparation method and application thereof
ActiveCN107459743AGuaranteed mechanical propertiesIncrease elasticityPolyvinyl chlorideUltimate tensile strength
The invention relates to a high-elasticity environment-friendly polyvinyl chloride material composition as well as a preparation method and application of the composition. The composition contains the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 0.5-15 parts of a stabilizer, 0.5-20 parts of a processing aid, 1-20 parts of a mass modifier, 0.1-10 parts of a lubricant, 0.5-20 parts of a filler and 0-5 parts of a pigment, wherein the K value of the polyvinyl chloride resin is 60-65; the stabilizer is at least one of a zinc-calcium stabilizer and a magnesium-aluminum-zinc stabilizer. According to the high-elasticity environment-friendly polyvinyl chloride material composition, a tin-containing stabilizer or a lead-containing stabilizer is not used, and meanwhile, the high-elasticity environment-friendly polyvinyl chloride material composition has excellent elasticity and strength performance and is good in color and luster and low in cost.
Owner:无锡宏义高分子材料科技有限公司
Preparation method for hydroxycalcium carbonate and application of hydroxycalcium carbonate in animal feed field
ActiveCN109399686AWeak alkalineMild responseCalcium/strontium/barium carbonatesAccessory food factorsReaction rateAcid substances
The invention discloses a preparation method for hydroxycalcium carbonate for an animal feed. The preparation method comprises the following steps: adding a calcium source to water and warming, addingbicarbonate in a stirring condition, reacting in a constant temperature, after ending a reaction, cooling and crystallizing, filtering and drying, to obtain the hydroxycalcium carbonate. The preparation method is more moderate in reaction rate, controllable in process, more uniform in obtained product particles, less in by-product generation, high in bioavailability of the hydroxycalcium carbonate, and low in processing cost. The invention further discloses an application of the hydroxycalcium carbonate in the animal feed field. While the hydroxycalcium carbonate is used for a pig feed, an additive amount thereof is 1-12 kg / t of a mixed feed; while the hydroxycalcium carbonate is used for a poultry animal feed, the additive amount thereof is 1-23 kg / t of the mixed feed; and while the hydroxycalcium carbonate is used for a ruminant animal feed, the additive amount thereof is 0.1-4 kg / t of a full mixed daily ration feed. The application is capable of neutralizing acidic materials in thefeed, and preventing or delaying metamorphism of the feed.
Owner:XINGJIA BIO ENG CO LTD
Method for synthesizing polyacrylonitrile by Lewis base
The invention belongs to the field of synthesis of a high molecular material and particularly relates to a method for synthesizing polyacrylonitrile by a Lewis base. The method is characterized by comprising the following steps of: under the protection of nitrogen gas, mixing 1,4-N,N-dimethylamino pyridine DMAP and dimethylamino pyridine DMSO to prepare a solution; then adding acrylonitrile into the solution to carry out polymerization reaction; reacting at a polymerization temperature of 0-60 DEG C for 1-48 hours, wherein the mass ratio of the dimethylamino pyridine to an acrylonitrile monomer is (7-500): 100; and the mass ratio of the 1,4-N,N-dimethylamino pyridine DMAP to the acrylonitrile monomer is (1.5-25): 100. The method has the beneficial effects that: an anion polymerization condition of the system is moderate and the acrylonitrile can be polymerized at a room temperature and a normal pressure; less side reaction exists and a product is pure; the control on the composition, the molecular weight and the distribution of a polymer is realized; and the polyacrylonitrile has a wide application prospect in the fields of polyacrylonitrile fibers, carbon fiber precursor materials, porous carbon material precursors and the like.
Owner:BEIJING UNIV OF CHEM TECH
Polycarboxylic acid polymer, preparation method and application thereof
The invention belongs to the technical field of building material preparation, and particularly relates to a polycarboxylic acid polymer, a preparation method and application thereof. The method comprises the following steps: (1) adding a polymerization inhibitor and part of unsaturated carboxylic acid into molten unsaturated polyether to form a mixed solution A; (2) preparing a mixed solution B from an esterification monomer and the residual unsaturated carboxylic acid; and (3) adding the mixed solution B into the mixed solution A, and performing bulk polymerization under the action of an initiator to obtain a polycarboxylic acid polymer, wherein in the step (3), inert gas is introduced in the early stage of the reaction, oxygen is introduced in the middle stage of the reaction, and inert gas is introduced in the later stage of the reaction. According to the invention, when the method is used for preparing the polycarboxylic acid polymer, the viscosity of a reaction system can be well controlled, the reaction rate is improved, the whole reaction process is stable, the molecular weight of the obtained polymer is narrow, and the effective content is increased; and the polycarboxylic acid polymer is used as a cement grinding aid, so that the grinding aid has good grinding aiding effect, water-reducing rate and early strength performance, and a solvent does not need to be added in the use process.
Owner:JIAHUA CHEM TECH DEV SHANGHAI CO LTD
High elastic environment-friendly polyvinyl chloride material composition and its preparation method and application
Owner:无锡宏义高分子材料科技有限公司
A kind of acetylation method
ActiveCN110467519BImprove solubilityReduce contentOrganic compound preparationHydroxy compound separation/purificationCyanide compoundAlcohol
The present invention provides an acetylation method, using N,N-dimethylformamide as a solvent, inorganic cyanide as a side reaction inhibitor, in the presence of catalyst alkoxide or amino salt, saturated or unsaturated ketone or aldehyde compound The corresponding alkynyl alcohol compounds are obtained through the acetylation reaction, which has the advantages of moderate reaction rate, mild reaction and easy control, easy product separation, and solvent recovery.
Owner:WANHUA CHEM GRP CO LTD
Method for preparing aerated board by utilizing multistage aluminum powder and aerated board prepared by using method
ActiveCN114075064AAvoid uneven distribution of air bubblesImprove compression performanceSolid waste managementCeramicwareBuilding materialCement Material
The invention discloses a method for preparing an aerated board by utilizing multistage aluminum powder and the aerated board prepared by using the method, and relates to the technical field of building materials. The method for preparing the aerated board by using the multistage aluminum powder comprises the following steps: S1, mixing: weighing fly ash and sand, adding board powder, and carrying out uniform mixing to obtain a mixture, wherein the board powder comprises the following raw materials: gypsum, lime powder, ammonium acetate and cement; S2, slurrying: adding water and aluminum powder into the mixture, and carrying out stirring to prepare slurry; S3, foaming and standing: injecting the slurry into a mold, and carrying out foaming and standing successively to obtain a board blank; and S4, steam curing: cutting the board blank into concrete blocks, transferring the concrete blocks into a still kettle, and performing steam curing to obtain the aerated board. The method for preparing the aerated board by using the multistage aluminum powder has the advantage of improving the mechanical strength of the produced board. The aerated board prepared by using the method for preparing the aerated board from the multistage aluminum powder has the advantage of high mechanical strength.
Owner:四川滨水上锦绿色建材有限公司
A kind of preparation method of liquid polycarboxylate water reducer
The invention provides a preparation method of liquid polycarboxylate superplasticizer. Through a main body polymerization reaction, the polycarboxylate superplasticizer is prepared. The preparation method includes steps of (1), mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, and controlling temperature at 40-60 DEG C; stirring evenly and then adding initiator and mixtureof unsaturated carboxylic acid and chain transfer agent; (2), curing for 0.5-1 hour after completing step (1), cooling to obtain collapse-preventing type polycarboxylate superplasticizer. The main body polymerization reaction is carried out under a relative low temperature, the operability is strong, the condition is gentle, and the energy consumption is low; the preparation method is applied to compound polycarboxylate superplasticizer with excellent performance; the polycarboxylate superplasticizer prepared by the method is liquid state under the room temperature, the effective concentrationis up to 100%; the storage performance is stable, and the liquid polycarboxylate superplasticizer is suitable for long-distance transportation and use, thereby bringing good construction condition for concrete construction.
Owner:JIAHUA CHEM MAOMING
A kind of aluminum oxide thin film and preparation method and application thereof
ActiveCN102787309BQuality improvementLow heat treatment temperatureTransistorSolid/suspension decomposition chemical coatingDissolution reactionCoordination complex
The invention discloses a preparation method of an alumina thin film in the field of a thin film transistor. The preparation method comprises the following steps of: preparing aluminium precursor solution, i.e., dissolving a precursor material containing aluminium metal ions and a stabilizer in solution and sufficiently stirring to sufficiently dissolve the precursor material and the stabilizer to obtain the precursor solution; and preparing the alumina thin film, i.e., coating the prepared reaction solution on a coating surface to form a film and carrying out heat treatment program to obtain the alumina thin film. The invention also relates to the alumina thin film prepared by the preparation method and application of the alumina thin film in the transistor. The application comprises the thin film transistor of the alumina thin film and a preparation method of the thin film transistor. According to the preparation method of the alumina thin film, which is disclosed by the invention, by adding a right amount of stabilizer for stabilizing an alumina precursor material, a metal organic complex is formed by the precursor material of aluminium through the coordination dissolution reaction; the complex can be well dissolved in the solution and has low thermal decomposition temperature; and the heat treatment temperature in the preparing process is reduced.
Owner:TSINGHUA UNIV +2
A kind of method of producing iron oxide yellow
Owner:杭州金丰环保科技有限公司
Modified calcium oxide expansion agent for shrinkage-compensating concrete and preparation method thereof
Owner:海南胜凯建材有限公司
A kind of polycarboxylate water reducing agent and preparation method thereof
The invention belongs to the technical field of concrete admixture preparation, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. The method comprises (1) preparing hydroxyethyl-terminated vinyl polyoxypropylene polyoxyethylene ether; (2) preparing polycarboxylate water reducer; the double-ended vinyl ether small monomers contain alkoxy groups and Contains double bonds; preferably, the vinyl ether monomer is ethylene glycol divinyl ether and / or diethylene glycol divinyl ether. The content of ultra-high molecular weight copolymer in the polycarboxylate water reducer prepared by the method is reduced, the relative molecular weight distribution is normal distribution, the molecular weight distribution is narrow, and there are almost no strong polar ultra-high molecular weight by-products; The reaction rate is controllable, the heat release is mild and stable, avoiding the local detonation phenomenon caused by high temperature during the polymerization reaction, and the monomer conversion rate can be increased to more than 95%.
Owner:JIAHUA CHEM TECH DEV SHANGHAI CO LTD
A kind of rigid polyurethane foam and preparation method thereof
The invention discloses a rigid polyurethane foam and a preparation method thereof. The preparation method of the rigid polyurethane foam comprises the following steps: premixing 100 parts by weight of hyperbranched polyurethane polyol with 1-10 parts by weight of foam stabilizer, adding 100-250 parts by weight of organic isocyanate or modified isocyanate to the pre-mixture and then curing at 30-100 DEG C for 12 hours to 3 days, thus obtaining the rigid polyurethane foam, wherein the hyperbranched polyurethane polyol is prepared by use of the following steps: reacting a polyhydroxylated compound with a diisocyanate monomer to obtain a first-generation hyperbranched prepolymer; on the basis of the isocyanate group content of the first generation hyperbranched prepolymer, adding the polyhydroxylated compound again and reacting to obtain the hyperbranched polyurethane polyol. The rigid polyurethane foam prepared by use of the method is high in strength, good in temperature resistance, good in dimensional stability and low in heat conductivity coefficient, and can be applied to the fields of thermal insulation, gap filling and supporting, wood-imitation materials and the like.
Owner:SOUTHWEST PETROLEUM UNIV
A kind of preparation method of superconducting Josephson junction
ActiveCN108110131BRealize mass productionSimple processSuperconductor detailsDissimilar materials junction devicesHemt circuitsParticle physics
Owner:ORIGIN QUANTUM COMPUTING TECH (HEFEI) CO LTD
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