108results about How to "Higher than the surface" patented technology

The invention discloses a preparation method of a compound graphite material for a lithium ion secondary battery. The preparation method comprises the following steps of: firstly pouring natural graphite, a binding agent and a graphite catalyst which are taken as raw materials into a roller furnace, wherein the roller furnace rotates all the time in a raw material pouring process; then progressively heating the raw materials, namely heating the raw materials in the roller furnace by adopting a progressive heating mode while the roller furnace rotates in a heating process, and then carrying out natural cooling to normal temperature after the raw materials in the roller furnace are heated; and finally carrying out graphitizing treatment on the raw materials, thus the binding agent forms artificial graphite, and the artificial graphite forms a coating on natural graphite particles, so as to form a shell-core structure, and compound particles of the shell-core structure are further spliced to form compound graphite particles with the required grain diameter. The compound graphite material prepared by the invention is of the shell-core structure with the natural graphite as an inner core and an artificial graphite layer as a coating, and the compound graphite has good isotropy, high capacity, high compactness, excellent multiplying, low temperature and cyclic performances and low electrode expansion. The preparation method of the compound graphite material for the lithium ion secondary battery adopts a method that coating and splicing are carried out at the same time, the preparation method is simple and practicable, and the cost is low.

The invention relates to a manufacturing method for tempering cellulose fiber with intelligent tempering performance, characterized in that microcapsule grout of phase change energy storage materials with the weight of 10-230% of the fiber is put into the fiber stock solution of cellulose so as to form spinning dope by even mixture, which enters into the dilute caustic soda solution and dilute sulfate in turn to form the fiber; tempering cellulose fiber is formed by dilute acid decoppering, washing and drying. It is provided with simple process, low manufacturing cost and wide applicable range. The tempering cellulose fiber has the base material of cellulose fiber and the functional additive material of microcapsule of phase changer energy storage materials. The phase change energy storage materials are not easy to leak and is provided with good heat stability and tempering effect. When it is applied in down-proof fabric and duvay the phase change energy storage materials can strengthen the tempering performance.

The invention discloses a used lubricating oil complete hydrogenation type regenerated catalyst and a preparation method and application thereof. The catalyst comprises catalyst carrier and active components, wherein the active components are WO3, NiO and assistant Si; WO3 accounts for 28-38% of the total weight of the catalyst, NiO accounts for 4-8%, Si accounts for 2-3%, and the balance is Al2O3 carrier; and the specific surface area of the catalyst is 230-265m<2> / g, and the pore volume is 0.47-0.55ml / g. The preparation method of the invention uses the characteristics of used lubricating oil, selects W-Ni metal in a certain proportion as active component, combines with assistant Si and selects various components and reasonable proportioning to prepare the catalyst with higher hydrogenation activity and selectivity. The catalyst has ultrahigh specific surface area, large pore diameter and properties of weak acid, is used to perform hydrogenation to the full-range components of used lubricating oil, has strong ability of removing S, N and O and performing hydrosaturation of unideal components and has extremely high demetalization and metal resistance.

The invention relates to a preparation method for a particle diameter controllable millimeter-scale polyurea monodisperse microsphere. The preparation method comprises the following steps: isocyanate compound is adopted as a monomer and is squeezed through syringe needles or capillary tubes to form liquid drops and the liquid drops are added into water or a polyamine aqueous solution for sedimentation and polymerization; during the settlement process of the liquid drops, the monomers on the surfaces of the liquid drops react with the water or the polyamine aqueous solution rapidly to form a gelatin layer or callus and the stability of particles is maintained. According to the method, as water is adopted as the dispersion medium, no pollution is generated; the polymerization reaction can be conducted under lower temperature, the equipment is simple and the manufacturing cost is low; the obtained microsphere is free from residual monomer and the post-processing is simple; no surface modified agent or pore-foaming agent is needed, porous polyurea microsphere with rich amino on the surface is prepared in one step; the method can be used in the fields of enzyme immobilization, chemocatalysis, dye, adsorption and separation of heavy metal ions and the like.

The invention discloses a preparation method of a cathode active substance for a lead carbon battery, and belongs to the technical field of the manufacturing of lead-acid storage batteries. The special lead carbon battery and a paste device are adopted, the components are mixed in the optimum proportion, and the dry mixing time, the wet mixing time and the acid mixing time in all steps are controlled, so that cathode lead paste for the lead carbon battery, which is good in production quality (the dispersity of carbon material is good), is controllable in process, and satisfies the requirements for battery performance, is obtained. Through the adoption of the lead paste, the large-current charging and discharging receptivity of the battery, and the cycle performance of the battery under a partial state of charge can be obviously improved, and the sulfation of the surfaces of electrodes can be inhibited, so that the battery has high power capacity and long cycle life.

The invention relates to a high selective catalyst, which mainly solves the technical problems of low raw material conversion rate and low destination product selectivity during preparing ethylene glycol by oxalic ester hydrogenation in the prior art. An active ingredient, an auxiliary agent and a carrier are adopted in the catalyst. The catalyst comprises the following components in part by weight: a) 8 to 60 parts of active intergradient selected from copper, copper oxide or mixture thereof; b) more than 0 to 20 parts of at least one auxiliary agent selected from main group metal element, transition metal element or lanthanide compound; and c) 20 to 60 parts of carrier, wherein the carrier is selected from adhesive-free molecular sieve, the specific surface is 100 to 800 square meters per gram, and the molar ratio of Si to Al is 40 to full silicon. According to the technical scheme, the high selective catalyst well solves the problems, and can be applied to the industrial productionof preparing the ethylene glycol by hydrogenation of the oxalic ester.

The invention provides an anode of a high-energy lithium / thionyl chloride battery and a preparation method of the anode. The anode of the high-energy lithium / thionyl chloride battery contains acetylene black, a teflon emulsion, absolute ethyl alcohol and conductive carbon fiber, wherein the mass ratio of the acetylene black to the teflon emulsion to the absolute ethyl alcohol is 10: (0.8-1.2): (53-57), and the carbon fiber accounts for 8-12 percent of the acetylene black by mass. By virtue of the excellent conductivity of the carbon fiber, the charge transfer situation of active particles on the surface of the carbon anode is remarkably improved, the transmission of reaction ions and ionic charges is dredged, the anode electron conduction capability is improved, the passivation and deactivation process is retarded and the capacity and the working voltage of the lithium / thionyl chloride battery is improved, and therefore the high-energy lithium / thionyl chloride battery is very suitable for a battery using environment at -40-71 DEG C.

The invention discloses a preparation method for a honeycomb ceramic carrier coating, which comprises the following steps: using cordierite as a carrier, using polyethylene glycol or polyvinyl alcohol or carboxymethyl cellulose as a pore-forming agent and using urea as a dispersant; at the room temperature, using pseudo-boehmite grout having a solid content of 22 percent as a raw material, adding nitric acid into the raw material, wherein the molar ratio of the nitric acid to the pseudo-boehmite is 0.08 to 0.1, the mass ratio of the pore-forming agent to the pseudo-boehmite is 0.19 to 3 percent and the mass ratio of the dispersant to the pseudo-boehmite is 35 to 50 percent; stirring the mixture at a high speed for 2 to 5h to form alumina sol; and soaking the pre-treated honeycomb ceramic cordierite in the alumina sol to form a modified honeycomb ceramic carrier. The coating material of the invention is suitable for the surface modification of honeycomb ceramics, enables the specific surface area of the honeycomb ceramic carrier to reach 51.18m<2> / g and forms high binding firmness between the coating and the carrier, so the honeycomb ceramic carrier coating is suitable for industrialized application.

The invention discloses a hydrotreating catalyst and a preparation method thereof. In the method, a boron aid is introduced by adding stable boron-containing organic compound solution after aluminium hydroxide is gelatinated, so that the boron aid is uniformly distributed in the catalyst and the activity phase transformation promoting effect of the boron acid is enhanced; moreover, the obtained catalyst has a high pore volume, a large specific surface area, an appropriate pore structure and appropriate acidity, enhances the activity and stability of the catalyst and is particularly suitable for the hydro-denitrogenation process of heavy hydrocarbons.

The invention is concerned with the activator of polymethyl methacrylate and the preparation method that makes by methyl propenal directly, which is heteropolyacids catalyst with Keggin structure character. The transforming rate of the activator MAL is over 95%, which can maintain the selection of MMA to be over 90%, the stability of the activator is good; the feedback rate is higher than the reaction that the activator is Pd, the activator is fit for fixing bed reactor, the touching time is 20 to 28second, but, the Pd activator is fit for batch reactor, the reacting time is several hours.

The invention which relates to the field of structured fillers concretely relates to a cheap and high efficiency rectification filler and a preparation method thereof. The filler which is suitable for a rectification operation under a temperature of less than 300 DEG C is formed by stacking filler unit plates with corrugated shapes, the filler unit plates are foamed resin-based filler unit plateswith three-dimensional connected network structures, the foam pore sizes are between 10PPi and 80PPi, and the volume fraction is controlled between 10% and 80%. A plurality of the filler unit plates are stacked, the filler unit plates of the odd-numbered layers have a consistent channel direction, and the filler unit plates of the even-numbered layers have a consistent channel direction, and an angle between the channel direction of the filler unit plates of the odd-numbered layers and the channel direction of the filler unit plates of the even-numbered layers is 30-170 DEG; a corrugation angle between a corrugation parallel direction and a vertical direction of a filler disc is 15-85 DEG, corrugations of adjacent filler unit plates have a same angle and opposite directions; and the filler unit plates are bonded after being stacked, and are subjected to a heat treatment to obtain the filler. The foamed resin-based structured filler unit plates of the invention allows the three-dimensional network connectivity characteristic of a polyurethane foamed plastic template to be kept, and has the characteristics of large specific surface area, thin wall, cheapness, high chemical stabilityand the like.

The invention discloses an emulsion-type accelerator special for sprayed concrete, and belongs to the technical field of building materials. The developed accelerator is formed by activated sepiolite,polyethyleneimine, modified nano oxidized graphene and water. A preparation method comprises the following steps: in a preparation process, firstly weighing each component according to a raw materialcomposition, adding the activated sepiolite, the polyethyleneimine, the modified nano oxidized graphene and the water to a high-pressure reaction kettle, and continuously feeding a carbon dioxide gasto the reaction kettle, after a pressure is risen to 0.6-0.8 MPa, stopping feeding, stewing, after the pressure in the reaction kettle is reduced to 0.3-0.5 MPa, opening the reaction kettle, depressurizing until a normal pressure, and discharging, to obtain the emulsion-type accelerator special for the sprayed concrete. The obtained emulsion-type accelerator special for the sprayed concrete has excellent long-term strength and durability.

The invention discloses a preparation method of a nitrogen-carbon doping modified nickel-based catalyst and application thereof for catalyzing nitrocyclohexane hydrogenation reaction. According to the invention, a catalyst is firstly subjected to nitrogen doping modification, and then is loaded with nickel, and the obtained catalyst is applied to the nitrocyclohexane hydrogenation reaction. An N doped carbon support is capable of improving the dispersibility of reactive metal remarkably, the particle size of metal is reduced and the specific surface of metal is increased, so that cheap metal Ni is used to replace noble metal as reactive metal, high selectivity of cyclohexanone-oxime can be ensured and the cost is remarkably reduced. The application process is environmentally friendly and simple and has mild conditions, and the yield of cyclohexanone-oxime is obviously improved by improvement of the reaction conditions and the catalyst.

The invention relates to a preparation method of a graphene modified flame-retardant waterborne polyurethane coating and adhesive. The preparation method comprises the following steps: preparing a flame-retardant MOFs compound from MOFs, preparing a flame-retardant MOFs dispersion liquid from the flame-retardant MOFs compound, and finally preparing the polyurethane coating and adhesive from polymer polyol, isocyanate, dibutyltin dilaurate and the flame-retardant MOFs dispersion liquid. The effect of improving the two important indexes of flame retardance and static prevention of the polyurethane coating and the adhesive is outstanding.

The invention relates to a preparation method for a cobalt-nickel oxide composite material as a supercapacitor electrode material. The preparation method includes the following steps: (1) nickel acetate tetrahydrate and cobalt acetate tetrahydrate are dissolved into the mixture of glycol and water, glucose is added after stirring, stirring is then continued, and thereby mixed solution is prepared; (2) the mixed solution is poured into a hydrothermal reaction kettle to react under 100 DEG C to 200 DEG C for 2 to 48 hours, the hydrothermal reaction kettle is then cooled to room temperature, and thereby reaction product is obtained; (3) the reaction product obtained in step 2 is centrifuged, washed and dried, the dried sample is calcined, and thereby the cobalt-nickel oxide composite material is obtained. Compared with the prior art, the method is simple, environment-friendly and low-cost, and is suitable for mass production, and the prepared hydrangea-shaped cobalt-nickel oxide electrode material has high specific capacitance, and is an excellent supercapacitor electrode material.

The invention discloses a preparation method of a kaolin-based three-dimensional particle electrode, comprising the steps of (1) grinding, to be specific, grinding kaolin and Hydrilla to powder, and drying to constant weight; (2) mixing and forming, to be specific, dissolving ferrous sulfate septahydrate and copper sulfate pentahydrate in water to obtain mixed liquid, adding the kaolin powder and the Hydrilla powder to the mixed liquid, and performing isometric impregnation adsorption for 1-3 h so that uniform mixing is achieved and spheres 3-5 mm in particle size are produced; (3) drying, to be specific, drying the spheres; (4) calcining, to be specific, calcining the spheres to obtain the kaolin-based particle electrode. The kaolin-based particle electrode prepared through the method employs porous kaolin as a carrier and Hydrilla as a pore-forming agent, Fe and Cu metallic catalysts are supported to the kaolin-based particle electrode, the supported particle electrode can provide homogeneous Fe2+ and Cu2+ catalyst and nonhomogeneous Fenton catalyst for reaction, and dye wastewater can be degraded effectively and may be reused.

The invention provides modified charcoal, a soil repairing agent and a preparation method and application thereof, and relates to the technical field of charcoal. The modified charcoal provided by theinvention is prepared from corn straw, a graphene oxide suspension, a nano SiO2 suspension and a CaCl2 solution, wherein the volume ratio of the corn straw to the graphene oxide suspension, the nanoSiO2 suspension and the CaCl2 solution is (45-55)g:(10-20)mL:(15-25)mL:(15-25)mL. The modified charcoal provided by the invention has a porous property and a large specific surface area, has a good adsorption capability, and is capable of effectively degrading activity of soil heavy metals and organic pollutants in soil.

The invention relates to a modified adsorption resin and a preparation method thereof, and concretely relates to a modified adsorption resin simultaneously having a polar group and a protonatable tertiary amine group, and a preparation method thereof. The method comprises the following steps: 1, suspension polymerization balling: preparing a polystyrene resin through a routine resin preparation process; and 2, grafting reaction and residual double bond post-crosslinking: swelling the resin obtained in step 1 with an organic solvent according to a case that 6-10L of the organic solvent is needed by each kilogram of the resin, adding a polar monomer and an initiator, carrying out a stirring reaction at 60-80DEG C for 4-8h, extracting out the obtained mother liquid, washing the obtained resin with a grafting reaction solvent twice, supplementing a crosslinking reaction solvent, adding a Fourier catalyst, carrying out a stirring reaction at 60-80DEG C for 4-8h, and washing the obtained resin after reaction ending to obtain the modified adsorption resin simultaneously having a polar group and a protonatable tertiary amine group. The specific surface of the resin is increased, so the introduction of the polar group and the maintenance of a high specific surface are simultaneously realized.

The invention discloses a nano fiber artificial blood vessel for catalyzing and releasing nitric oxide and a preparation method. The artificial blood vessel consists of a three-dimensional reticular non-woven film pipe structure formed by an inner layer and an outer layer of nano fibers. The artificial blood vessel is prepared by the following method comprising the following steps of: dissolving gelatin in glacial acetic acid to prepare a solution; adding a sodium heparin aqueous solution to prepare a spinning dope for electrostatic spinning to form nano fiber non-woven film pipes; dissolving polyurethane and nantokite chelate in a mixed solution of tetrahydrofuran and N,N-dimethyl fomamide to prepare a polyurethane spinning dope; carrying out electrostatic spinning to continue collecting polyurethane fibers on a collecting roller with the nano fiber non-woven film pipes so as to form polyurethane fiber non-woven film pipes; and soaking and treating the polyurethane fiber non-woven film pipes in an aqueous solution of a crosslinking agent. The artificial blood vessel can catalyze and release nitric oxide for a long time in vivo and in vitro and is beneficial to inhibiting the aggregation of platelets. The preparation method is simple, and the crosslinking degree is easy to control.

The invention relates to the technical field of metal or alloy powder, in particular to a nickel or nickel alloy perforated nanosphere and a method for manufacturing the same. The nickel or nickel alloy perforated nanosphere is powdery and contains water, nickel hydroxide, nickel oxide, hydrogen and steam, the aperture of the perforated nanosphere ranges from 20nm to 100nm, and the diameter of the perforated nanosphere ranges from 60nm to 300nm. Compared with the prior art, the nickel or nickel alloy perforated nanosphere and the method have the advantages that the diameter of the nickel or nickel alloy perforated nanosphere reaches a nanometer scale, perforated nano-pores are formed in the nickel or nickel alloy perforated nanosphere, accordingly, the specific surface areas of grains further can be increased, and the electromagnetic performance of nickel or nickel alloy powder can be greatly improved.

The invention discloses a hydrophobic graphdiyne composite iron-containing MOF adsorbent and a preparation method thereof. The method comprises the following steps: firstly, grinding MOF (Fe) into small-particle seed crystals, and dispersing the small-particle seed crystals into a copper acetate aqueous solution by using ultrasonic waves; adding dichloromethane into the solution, and stirring at ahigh speed to prepare a Pickering emulsion; dissolving hexacetenyl benzene into a certain amount of dichloromethane, and adding the mixture into the Pickering emulsion; growing graphdiyne on an emulsion interface containing a Cu catalytic site, then heating in a water bath to remove an organic phase, and centrifugally separating out graphdiyne composite seed crystals MOF (Fe); and finally, putting the graphdiyne composite seed crystals MOF (Fe) into ferric nitrate nonahydrate and trimesic acid to carry out secondary hydrothermal growth of MOF (Fe) crystals to obtain the high-hydrophobicity graphdiyne composite MOF (Fe) adsorbent. The stability of the Pickering emulsion is controlled by controlling the addition amount of MOF (Fe) and the ratio of a water phase to an oil phase, so that theaction between graphdiyne and MOF (Fe) seed crystals is influenced, the growth of MOF (Fe) is influenced, and the final hydrophobicity of the adsorbent and the preferential selective adsorption on hydrocarbon VOCs are effectively improved.

The invention discloses a menthol electro oxidation catalyst electrode, its process method and application, wherein the electrode relates to a metallization membrane modification electrode and is used as an electrochemical sensor for catalyzing menthol electro oxidation.A charged strong electron donating group polyaniline derivant poly-2,5-dimethoxybenzamine metallization membrane modification electrode comprises inert electrode base, conductive polymer membrane and catalyzer, wherein, polymer adhesion amount on the surface of base electrode is 0.3-1.0mgíñcm-2.The method comprises following steps: mixing PDMAn mixed with alcaine in N,N-dimethyl formamide or tetrahydrofuran to get 1.0í½10.0mg / mL liquor; coating liquor on electrode surface and drying it; changing coating times to adjust polymer adhesive materials; placing electrode in HCI liquor; conducting periodic scan or directional scan and changing times to get modification electrode with different platinum deposit rate.

The invention relates to a cable material, in particular to a mould-proof flame retardant polyethylene cable material. The mould-proof flame retardant polyethylene cable material comprises 90-120 parts of high-density polyethylene resin, 60-80 parts of linear low-density polyethylene resin, 4.5-8 parts of carbon black, 20-42 parts of a flame retardant, 2-5 parts of a composite antibacterial agent,20-28 parts of zeolite and 0.2-2 parts of auxiliaries, wherein the composite antibacterial agent comprises titanium dioxide powder wrapped by polyethylene glycol and a nano silver material; and the zeolite is subjected to refining pretreatment. The composite antibacterial agent and the flame retardant are added, so that the mould-proof flame retardant polyethylene cable material has antibacterialand flame retardant effects at the same time; meanwhile, the composite antibacterial agent and the flame retardant fill the pore structures of zeolite, and the zeolite powder is interspersed in a network structure formed by the high-density polyethylene resin and the linear low-density polyethylene resin which are blended, so that the retaining effect of the flame retardant and the composite antibacterial agent is greatly improved, and loss of the composite antibacterial agent and the flame retardant is avoided.

The invention relates to an amino acid nanometer facial cleanser rich in soybean polysaccharides and a preparation method thereof. The amino acid facial cleanser comprises the following compositions:water, leucine, glycine, valine, serine, threonine, histidine, alanine, arginine, sericin, sodium methyl cocoyl taurate, cocoamidopropyl betaine, soybean polysaccharides, honey extract, tocopherol, ginger, phenoxyethanol and essence. The facial cleanser has the advantages that: a plurality of amino acids are used as raw materials, soybean polysaccharides are added after the amino acids are compounded, and the prepared amino acid nanometer facial cleanser rich in soybean polysaccharides not only can realize high-efficiency cleaning effect, but also can reduce the application amount of a surfactant and reduce skin irritation, has high safety, and can be used by children and for sensitive skins. The compounded amino acids are matched with the soybean polysaccharides so as to have better moisturizing and anti-sensitization effects. The facial cleanser has mild performance, good stability, and no irritation to skin.

The invention discloses a natural gas demercuration adsorbent and a preparation method thereof. The natural gas demercuration adsorbent consists of 70 to 90 percent by weight of Al2O3, 2 to 8 percentby weight of active carbon, 6 to 15 percent by weight of copper sulphide and 4 to 12 percent by weight of total sulfur. The preparation steps are as follows: (1) Al2O3-AC composite carrier is pelletized; (2) the product in step (1) is soaked in sulfur solution; (3) the product in step (2) is soaked in soluble copper salt solution; (4) the product in step (3) is exposed to be vulcanized in a vulcanization environment; (5) deionized water is used for washing; (6) after drying, the natural gas demercuration adsorbent is obtained. According to the preparation method provided by the invention, thecomposite carrier which is prepared by adding active carbon in alumina carrier improves pore size and enlarges specific surface; since an S, CuS and CuSx multi-component active substance is carried bythe carrier, not only is the demercuration speed of mercury-removing agent with copper sulphide as an active substance improved, but also the loss of elemental sulfur can be prevented, rapid and stable demercuration is realized, and the mercury capacity is increased as well.

The invention discloses a process for degrading wastewater through an N-doped coated TiO2 photocatalyst. The adopted visible-light-induced photocatalyst is an N-doped disordered nano coated TiO2 photocatalyst. According to the catalyst, disordered nano coated TiO2 with a thin multi-layer core-shell structure is prepared first, N is doped in situ in crystal lattices, and due to the structural specificity and doping of the element N, photocatalytic degradation activity of TiO2 on organic dyes is improved. According to the process disclosed by the invention, the problem in the prior art that dyestuff wastewater is low in degradation efficiency is solved, and the process is applicable to organic dyes in contaminated water.

The invention discloses a catalyst for a hydrogenation regeneration process of waste mineral oil. The catalyst is characterized in that the catalyst is prepared from active components W and Ni and auxiliary components P and Si which are supported by aluminum oxide carriers, and specifically, the catalyst is prepared from, by total mass, 20%-28% of WO3, 7.0%-13.0% of NiO, 4.0%-10.5% of P, 3.0%-6.0% of Si and the balance of the aluminum oxide carriers; the catalyst has the specific surface area of 220-230 m<2> / g and the pore volume of 0.52-0.56 ml / g. According to the catalyst for the hydrogenation regeneration process of the waste mineral oil, the W and Ni double-component metal combination in a specific proportion is taken as the active component and matched with the auxiliary components including Si and P, and higher hydrogenation catalytic activity and selectivity are acquired through selection and reasonable proportioning of the components. Particularly, with the introduction of the auxiliaries Si and P, the specific surface area and the acidity of the carriers are increased, the dispersity of active metal is improved, the catalyst has super-high specific surface area, large pore diameter, weak acidity and can be used for hydrogenation of whole fraction of non-mineral oil.

The invention discloses a preparation method and an application of a Pd-Ni bimetallic catalyst supported by N-doped acid-activated sepiolite. The preparation method comprises the following steps: sepiolite is subjected to acid activation or acid modification firstly, then subjected to N-doping treatment and subjected to impregnation to support Ni and Pd. Non-noble metal Ni is taken as a dominant active component and is modified with a small amount of Pd for preparation of the Pd-Ni bimetallic catalyst, so that noble metal is prevented from being used as the only active component, the cost of the catalyst is reduced greatly, a technology for preparing cyclohexanone-oxime from nitrocyclohexane through liquid-phase hydrogenation is enabled to be more environment-friendly by means of the catalyst, the technology is simple, conditions are mild, and quite high nitrocyclohexane conversion rate and cyclohexanone-oxime with high selectivity can be obtained by optimizing the reaction conditions and preparing the catalyst.

The invention relates to a preparation method of Beta-type aluminum hydroxide, which is used for preparing the Beta-type aluminum hydroxide. Sodium aluminate solution is used as raw material, neutralized by feeding carbon dioxide and then is treated with filtering washing and drying to obtain the Beta-type aluminum hydroxide product. The preparation method is characterized in that Beta-type aluminum hydroxide seeds are added before the carbon dioxide is fed so as to produce the Beta-type aluminum hydroxide product with high purity and large specific surface area; in addition, the method has simple production technology, easy control of particle size and easy manipulation of the operation process.

The invention relates to a brake pad with three grades of adjusting mechanisms. The brake pad comprises a rigid plate; the three grades of adjusting mechanisms are arranged on the rigid plate; a recess part and a connecting hole are arranged on the rigid plate; the first-grade adjusting mechanism is a connecting block; the connecting block is provided with a smooth projection part; a cylindrical through hole is formed in the center of the projection part; a smooth concave surface is upwards recessed in the lower surface of the connecting block; the connecting block is in clearance fit positioning with a positioning hole in the surface of the rigid plate through a dowel pin; an arch top is arranged at the upper part of the second-grade adjusting mechanism, and a connecting boss is arranged at the lower part; the third-grade adjusting mechanism is a butterfly spring; limiting holes of friction blocks are formed in the rigid plate; the friction blocks are limited by the lower ends of connecting rods after penetrating through the cylindrical through hole and the limiting holes in sequence through clearance fit with the connecting rods; the contact surfaces of the friction blocks and the projection part are matched in shapes; and multiple friction blocks are distributed on the rigid plate. The brake pad can be correspondingly adjusted by different angles; and each friction block can be adjusted on one plane.