174results about How to "Reduce the probability of exposure" patented technology

The invention discloses a method for hydrolyzing dimethyl dichlorosilane with concentrated acid. The method comprises the following steps: mixing the dimethyl dichlorosilane with hydrochloric acid to carry out hydrolytic reaction; mixing the obtained reaction liquid with a solvent; finally, performing separating operation on the obtained mixed solution to obtain hydrolysis product and hydrogen chloride gas. Through the adoption of the method, the content of cyclic polysiloxane in hydrolysate obtained from the dimethyl dichlorosilane through the concentrated acid hydrolyzing method is effectively increased; the design is reasonable, hydrolysate with low chlorine ion content can be obtained in no need of multi-stage phase separation procedures, and the hydrochloric acid and solvent obtained after separation can be recycled, so that the resource use ratio is improved, and the production cost is saved.

The invention provides a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst with a titanium-based core-shell structure and a preparation method of the catalyst. The titanium-based core-shell structure of the catalyst is formed by use of composite nanoparticles MnOx-CeO2 as the core and TiO2 as the shell and the size range of the catalyst is from 20nm to 200nm, wherein the molar ratio of the three elements Mn, Ce and Ti is (0.05-1): (0.05-1): 1. The preparation method of the catalyst mainly comprises the following steps: (1) mixing cerous nitrate with a manganese nitrate solution, dropwise adding a sodium hydroxide solution and then shifting the mixed solution to a hydrothermal kettle, and carrying out reacting, centrifuging, washing, drying and calcining to obtain the nanoparticles MnOx-CeO2; (2) preparing the nanoparticles with the core-shell structure in a reversed-phase microemulsion with CTAB (Cetyltrimethyl Ammonium Bromide) as a surfactant, n-amyl alcohol as a cosurfactant and cyclohexane as an oil phase. The low-temperature SCR denitration catalyst with a titanium-based core-shell structure has the advantages that the titanium-based core-shell structure is constructed for the first time, the center of the catalyst is protected by use of the TiO2 shell, and the probability that the active center contacts with SO2 in flue gas is reduced, and therefore, the active center is prevented from irreversible poisoning caused by erosion of SO2.

The invention provides a preparation method of 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: taking monochlorodifluoromethane (R22) and methane chloride (methyl chloride) as raw materials and carrying out thermal cracking reaction at a high temperature of 600-1000 DEG C under the condition that N2 exits to prepare the 2, 3, 3, 3-tetrafluoropropene, wherein the volume ratio of the monochlorodifluoromethane to the methane chloride is 1-3:1, and the retention time of a reactant is 0.01-0.2 seconds. The reaction raw material used in the preparation method is easy to obtain, the defect of high cost of the used raw material in the prior art is overcome, the production cost is greatly reduced, and the reaction process is simple. The prepared 2, 3, 3, 3-tetrafluoropropene has the advantages of zero ODP and low GWP and can be used as a substitute of an automotive air-conditioning refrigerant.

The invention relates to a resetting device using flexible positioning and rigid clamping in combination and a positioning method thereof. The invention is characterized in that a cartridge comprises two to four radially-arranged positioning gears, the lateral side of each positioning gear is provided with a positioning slant surface, Z-direction stopping planes are arranged between two adjacent positioning gears, a workpiece supporting board is provided with positioning slots fit with the positioning gears and positioning planes fit with the Z-direction stopping planes, a pop-rivet comprises a pop-rivet body which is connected with the workpiece supporting board by bolts, the pop-rivet orifices on the cartridge is provided with positioning cone surfaces, the lateral side of the pop-rivet body is provided with cone-shaped positioning contact planes fit with the positioning cone surfaces. The device can simultaneously realize precise resetting and rigid clamping, and ensure high safety and reliability of mechanical processing and high manufacture preciseness and efficiency of the processed object.

There is disclosed a honeycomb structure usable as a support of a honeycomb catalyst onto which a large amount of catalyst can be loaded and which has a good purification efficiency, and the honeycomb structure includes porous partition walls 5 defining a plurality of cells to form through channels of a fluid and having a plurality of pores 10 therein, wherein a porosity of the partition walls 5 is from 45 to 70%, and in a cross section perpendicular to an extending direction of the cells, a total area of macro pores 12 having the largest pore diameter of larger than 10 μm is 50% or more with respect to a total area of the pores 10.

A catalyst 1 has a heat-resistant support 2 selected from among Al₂O₃, SiO₂, ZrO₂, and TiO₂, and a first metal 4 supported on an outer surface of the support 2, and included by an inclusion material 3 containing a component of the support 2.

The invention provides a sterilization control method and a device of a refrigerator, a storage medium, a server and the refrigerator. The method comprises the following steps of: receiving sterilization task information of the refrigerator sent by a control terminal and refrigerating door on/off information sent by the refrigerator and execution feedback information of a sterilization task; the execution feedback information comprises whether the sterilization task is executed and completed; creating or updating the sterilization task according to the sterilization task information, the refrigerating door on/off information and/or the execution feedback information of the sterilization task; issuing a sterilization control command to the refrigerator when meeting an execution time node ofany sterilization task, so that the refrigerator executes the corresponding sterilization task according to the sterilization control command; and the sterilization control command comprises the execution time node and task execution time of the sterilization task. The scheme provided by the invention can realize controlling refrigerator sterilization in combination with using habits of users tothe refrigerator, and a sterilization system of the refrigerator is more efficient and humanized.

The invention discloses an air purification coating additive and a preparation method and application thereof in the technical field of chemical coatings. The air purification coating additive is prepared from, by weight part, 5-20 parts of 1% graphene oxide aqueous solution, 4-5 parts of titanium source, 8-12 parts of silicon source, 3-5 parts of template and 130-150 part of distilled water. The air purification coating additive can degrade organic pollutant and is amphiphilic, and accordingly can be stably dispersed in oil systems as well as aqueous systems; by immobilizing TiO2 into graphene oxide modified mesoporous amphiphilic composite materials, the dispersibility of the TiO2 can be enhanced, and meanwhile, due to the large surface area of graphene and mesoporous silicon dioxide, formaldehyde and organic matter absorption capacity can be greatly improved; hydrophobicity of the graphene enhances surface distribution of the air purification coating additive in coating films, accordingly greatly improves the probability of contact with the organic pollutant and further improves the degradation efficiency.

The invention relates to an engine crankcase ventilation system and method. The system comprises an engine crankcase, one end of a PCV valve communicates with an oil-gas separator, one end of the PCVvalve communicates with the air inlet end of an intake manifold through a first one-way valve, and one end of the PCV valve communicates with one output end of a supercharger and an EGR mixing valve through a second one-way valve, an EGR cooler communicates with the input end of the EGR mixing valve, the other output end of the EGR mixing valve communicates with an air filter, the other end of thesupercharger communicates with the air inlet end of the intake manifold, and the air outlet end of the intake manifold communicates with an engine cylinder cover. According to the system, an engine oil aging speed can be effectively reduced, engine oil emulsification risk of a valve chamber cover, an oil filling cover and the wall surface of the oil-gas separator can be reduced, and the problem of a failure of icing at the tail end of a breathing tube in winter can be solved.

The invention discloses a low-sensitivity valley-free puffed staple food for dogs and cats, a composite freeze-dried puffed staple food for dogs and cats, and preparation methods and application thereof. The low-sensitivity valley-free puffed staple food for dogs and cats comprises 25-35 parts of poultry meat powder, 10-20 parts of poultry meat, 5-15 parts of poultry meat with bones, 8-23 parts ofpoultry internal organs, 2-10 parts of tapioca flour, 7.2-21.8 parts of grease, 2-7 parts of kelp powder, 0.1-0.5 part of table salt, 1-3 parts of beer yeast powder, 0.5-2 parts of saccharomyces cerevisiae extract, 0.5-2% of vitamin premix, 0.5%-2% of an organic trace element premix, 0.1%-0.3% of a prebiotic premix, and 0.1%-0.3% of a probiotic premix. The composite freeze-dried puffed staple food for dogs and cats comprises the following components in parts by mass: 90-95 parts of the puffed staple food and 1-5 parts of low-sensitivity freeze-dried particles. The compound freeze-dried puffedstaple food for dogs and cats purifies protein sources in products, reduces the probability of contact between dogs and cats and allergens, reduces allergy risks of dogs and cats, controls inflammation, helps dogs and cats relieve itching, edema, pain and other symptoms, and can also improve the antioxidant function of pets and enhance the immunity of pets.

The invention discloses a mobile phone wireless charging device with an overheat protection function, which belongs to the field of wireless charging, and adopts the scheme that a mobile phone is overheated during charging, so that an expansion rubber bead is expanded, the distance between the mobile phone and an induction panel is increased. When the back of the mobile phone is made of a metal material, the interior of the supporting back plate is heated, the heat enables the shape memory spring to contract in the guide rail, the induction panel is ejected outwards through mutual repulsion ofthe magnet in the arc-shaped magnetic blocking plate and the magnet at the lower end of the induction panel, and negative pressure is generated between the groove in the surface of the hollow latex ring and the glass panel of the mobile phone, the mobile phone is attracted, heat is transmitted to the magnetic type tail jack at the rear end through the supporting back plate, the flammable fiber atthe right end of the magnetic type tail plug is ignited, the magnetism between the magnetic type tail plug and the magnetic type tail jack is reduced, the magnetic type tail plug falls off in the magnetic type tail jack, and therefore the safety of wireless charging is further improved.

The invention relates to silicon carbide-hypereutectic silicon aluminum alloy composite material powder. Through adjusting the addition amount of silicon carbide and silicon, the wear resistance, thethermal conductivity, the specific heat capacity, a coefficient of thermal expansion and the strength of the composite material powder can adapt to different sliding/friction mating material, the abrasion is reduced, and the mechanical efficiency is improved. According to a preparation method of the composite material powder provided by the invention, raw material components are combined, a quickchilling spray powder producing process is adopted under an inert atmosphere condition, the size of a primary silicon grain size of the prepared composite material alloy powder is smaller than 10mu m,the prepared composite material alloy powder contains SiC micro grains with the size being 1 to 20mu m, and the alloy powder is quick chilled under the inert atmosphere, so that the oxygen content ofthe alloy powder is reduced, a composite material powder product shows low oxygen content, and a comprehensive mechanical performance and the wear resistance of the product are improved. In addition,the product conforms to a light-weight and miniaturized parts development trend, and has an excellent heat conduction and heat radiation performances, the mechanical efficiency is greatly improved, and the service life is prolonged.

The invention discloses intelligent air purification equipment with adjustable air volume and an adjusting method, and relates to the technical field of air purifiers. The equipment comprises an air purifier body, wherein a control panel is fixedly arranged on one surface of the air purifier body; an air inlet cavity, a filter cavity and an air outlet cavity are formed inside the air purifier body; a vent hole is formed in the position, corresponding to the air inlet cavity, of the air purifier body; a centrifugal fan is fixedly arranged in the air outlet cavity; and a wind direction adjustingassembly is further fixedly arranged in the air outlet cavity. According to the equipment, by means of the air direction adjusting assembly and the air volume adjusting assembly, an air volume adjusting mode the purifier in a using process is changed from a traditional fan adjusting mode into a dual adjusting mode with an air door and the fan, and through combination of the two modes, on one hand, the load and power consumption of the fan in the using process can be effectively reduced, and on the other hand, the noise of the purifier in the using process can be reduced.

The invention relates to the technical field of bamboo-plastic composite material preparation, and particularly relates to a preparation method of a mold-proof water-resistant bamboo-plastic compositematerial. According to the preparation method provided by the invention, polypropylene is used as a matrix, modified bamboo fibers and modified nano zinc oxide are used as reinforcing agents, and a self-made antibacterial emulsion, hydrogen-containing silicone oil and the like are supplemented to prepare the mold-proof water-resistant bamboo-plastic composite material. Firstly, the surface modification of the self-made bamboo fibers is carried out by using nano calcium carbonate and ethylenediaminetetraacetic acid disodium salt, so that the mechanical property of the bamboo-plastic compositematerial is improved; the nano zinc oxide is modified by using a silane coupling agent, the zinc ions dissolved out of the nano zinc oxide are combined with the cell membranes and membrane proteins, bacterial propagation is prevented through damaging the cell structure; the effect of sterilization and mildew prevention is achieved through the utilization of special properties of the nano zinc oxide; the hydrogen-containing silicone oil is continuously added, and a dense hydrogen-containing silicone oil hydrophobic protective layer is formed, so that the water resistance of the bamboo-plastic composite material is improved, and a wide application prospect is achieved.

The invention discloses a low-allergy and non-grain freeze-dried raw bone and meat staple food for dogs and cats and a preparation method and application of the low-allergy and non-grain freeze-driedraw bone and meat staple food. The freeze-dried raw bone and meat staple food for dogs and cats is prepared from meat, dressed meat, heart, liver, cartilage, cassava starch, collard, black sesame, kelp powder, a saccharomyces cerevisiae extract, DHA, salt, prebiotic premix, probiotic premix, organic trace element premix, vitamin premix and fruit mixture. The meat, the dressed meat, the heart, theliver and the cartilage are all derived from chickens or ducks. The freeze-dried raw bone and meat staple food for dogs and cats is high in nutritional value and good in palatability; and due to the fact that the single chicken or duck is adopted as the only meat food material source in the product formula, common high-allergy food materials are removed, and food for dogs and cats, which is comprehensive in nutrition and capable of effectively controlling and reducing anaphylaxis, is provided through reasonable matching.

The invention provides a preparation method of manganese dioxide and an application. The preparation method of manganese dioxide provided by the invention comprises the following steps: forming a Mn<2+> complex precipitate from a manganous salt under the action of a complexing agent, and oxidizing Mn<2+> into Mn<4+> by an oxidizing agent so as to prepare MnO2 of a stable structure; and performingheat treatment on the obtained MnO2 so as to remove adsorbed water and bound water therein, so that the electrochemical performance is ensured. The preparation method is simple in process and low in cost, the prepared manganese dioxide is of a nano-flake structure, and can be used for shortening the diffusion path of lithium ions and increasing the contact area with electrolyte during preparationof a battery positive electrode material, so that the contact probability between the active material in the positive electrode material and the electrolyte is reduced, corrosion of the electrolyte onthe active material can be effectively inhibited, and the stability of the positive electrode modified material is improved.

The invention relates to a preparation method of a fire preventing and extinguishing material for a coal mine and belongs to the technical field of flame-retardant materials. The prepared fire preventing and extinguishing material for the coal mine is water absorption gel, a large amount of condensed water and a small amount of immobile water exist in the water absorption gel, and 2-3 water molecular layers with the thickness of 0.5-0.6 nm are formed on the surfaces of molecules through hydrophilic hydration; the first layer is hydrated water formed by polar ion groups and water molecules through coordination bonds or hydrogen bonds; the second layer is a combined water layer formed by water molecules and hydrated water through hydrogen bonds; the gel absorbs water mainly through the interaction between internal three-dimensional space networks, a large amount of free water is absorbed and stored in grids, and the larger the pore diameter of the gel three-dimensional space networks is,the higher the water absorption rate is; the water absorption gel covering the surface of the coal body reduces the probability of contact between a coal body and oxygen, blocks an air leakage channel, reduces the oxygen concentration, absorbs heat for cooling and reduces the oxidation activity of the coal, so that the prepared fire preventing and extinguishing material for the coal mine is highin fire extinguishing efficiency and high in speed.

The invention provides a cylindrical hall thruster with a variable cross-section channel. The cylindrical hall thruster comprises a permanent magnet, an inner magnet core, a magnetic conductive base,a magnetic conductive member, an outlet magnetic pole, a ceramic channel and a positive pole. The permanent magnet, the magnetic conductive member and the outlet magnetic pole are ring-shaped parts and coaxial, and the inner magnet core is vertically arranged and located in the permanent magnet. The ceramic channel and the magnetic conductive base are separately connected to the upper end and thelower end of the inner magnet core, the outlet magnetic pole, the magnetic conductive member and the magnetic conductive base are connected from top to bottom in sequence, and the outlet magnetic poleis slidably connected to the upper edges of the magnetic conductive member and the ceramic channel. The ceramic channel is located inside the magnetic conductive member, an upstream part of the ceramic channel is a through channel, a downstream part of the ceramic channel is a variable section channel, and the positive pole is arranged at the bottom of the ceramic channel. According to the cylindrical hall thruster with the variable cross-section channel, on the basis of not affecting the ionization degree of a working medium, the problem that the performance of an existing cylindrical hall thruster is reduced due to increased interaction between plasmas and a wall surface is solved, the service life of the thruster is prolonged, and compared with the existing cylindrical hall thruster, the weight is significantly reduced.

The invention provides a preparation method of lanthanum trioxide and a positive electrode material of a battery coated with lanthanum trioxide, which comprises the following steps of: dissolving a proper amount of lanthanum salt to obtain liquid A; B liquid is obtain by dissolving an appropriate amount of complexe agent; B liquid is adde into A solution dropwise, stirred while adde dropwise, andthat temperature is maintained at (60-90) DEG C; Isothermal reaction (10-16) h to obtain C solution; C solution is filter to obtain precipitate, washed, precipitate is collect and dried at room temperature to obtain lanthanum hydroxide precursor; Lanthanum trioxide can be obtained by heat treatment of the precursor for a period of time. The invention provides a preparation method of lanthanum trioxide, The preparation process is simple, the cost is low, and the prepared lanthanum trioxide is nano-granular structure. Moreover, the nano-structure has strong stability, which is conducive to reducing the contact probability between the active material and the electrolyte in the cathode material, can effectively inhibit the corrosion of the electrolyte on the active material, and improves the stability of the cathode modified material.