31results about How to "Avoid chemical damage" patented technology

The invention relates to a magnetic composite microsphere immobilized laccase and a preparation method thereof, and belongs to the field of environmental microbiology. In the immobilized laccase, metal-chelated magnetic composite microspheres are taken as a carrier, and laccase is immobilized on the carrier through coordination bonding action. The preparation method comprises two steps of: preparing the carrier, namely synthesizing magnetic ferroferric oxide nanoparticles by using a chemical precipitation process, preparing core-shell magnetic silica by taking the nanoparticles as cores through a sol-gel method, grafting polymer containing carbonyl or amino on the surface of the magnetic silica by taking gamma-chloropropyltrimethoxysilane as a medium, and preparing a functional carrier capable of immobilizing the laccase by chelating transition metal ions (such as Cu2+. Zn2+, Ni2+ or Co2+); and immobilizing the laccase, namely performing coordination adsorption of the laccase on the surface of the carrier, washing, and drying to obtain the finished product of immobilized laccase. The immobilized laccase prepared by the method has high stability and activity and quick magnetic response, is easily recovered from a reaction system and can be repeatedly used; and the preparation process is simple and the cost is low.

The invention relates to a laser removing device for enameled wire cladding layer. The laser output from a laser output head is focused on the cladding layer of the enameled wire through a transmission optical path assembly. The enameled wire is coaxially arranged with the laser output head and the rotary driver. The rotary actuator rotates the transmission optical path assembly about its axis, removing the enameled wire cladding. A laser removing device for enamel wire clad layer adopts an automatic operation mode and utilizes laser to act on that enameled wire clad layer, which overcomes thedefect that the manual contact operation mode is easy to damage the enameled wire body and improves the working efficiency of removing the enameled wire clad layer compared with the sandpaper polishing mode; Compared with paint stripper, it can effectively reduce chemical pollution and personal hazards to operators.

The invention provides a water affinity type anti-pollution chlorine-resistant aramid composite membrane preparation method. The densities of a PEO chain, quaternary ammonium cation and salicylaldehyde which are grafted to the surface of a high-performance aramid composite membrane are high, the membrane surface hydrophilicity is high; a part sensitive to residual chlorine or chloride oxide compound in sea water of the composite membrane is eliminated through alkylation reaction of aramid active layer N-H groups, chemical damage to the composite membrane in a seawater desalination process is effectively avoided, and long-time stability of a structure of the aramid composite membrane is ensured; salicylaldehyde grafted to the membrane surface are in monomolecular-layer uniform distributionand can efficiently filter and adsorb heavy metal ions in the seawater, a synergistic antibacterial killing function between the quaternary ammonium cation and salicylaldehyde is generated, and positive significance in ensuring cleanness of the membrane surface is achieved.

The invention discloses mobile phone screen disassembling equipment which comprises an equipment body. A box is arranged on the equipment body which is internally provided with a screen disassembling structure, and the screen disassembling structure is provided with a working panel. Lower suction cups are arranged on the working panel, and upper suction cups are arranged above the lower suction cups. An encoder is arranged on the right side of an overturning mechanism which is provided with a ball screw module, a motor is arranged at one end of the ball screw module, and the overturning mechanism is provided with slide rails and a tension sensor which is provided with a self-lubricating rod end knuckle bearing. The mobile phone screen disassembling equipment is simple in structure and convenient to use, and the equipment body is full-automatic screen disassembling equipment; the temperature and speed are controllable, force is readable, other chemicals are not needed, toxicity is avoided, operation is convenient and rapid, and work efficiency is remarkably improved; and the portions making contact with products are all made of soft silica gel, the products are perfectly protected, scalding and chemical injuring to operators can be effectively avoided, and the safety factor of the operators is improved.

The invention relates to a jet power neutralizing electric spray gun used for high-pressure cleaning or high-pressure spraying to high-rise building. A manual spray gun is fixed on a spray gun seat, a transmission shaft is arranged at the lower end of the spray gun seat, the other end of the transmission shaft is fixed on a bottom plate, a motor is installed beside the bottom plate, and a transmission mechanism which is connected with the spray gun seat and can ensure the spray gun to perform spraying from side to side is installed on the motor. In order to neutralize the jet power caused by the spraying of the spray gun to walls, firstly, the bottom plate is fixed on a bevel edge of the triangle spray gun seat to break down the jet power; secondly, the bottom part of the triangle spray gun seat is fixed at the top part of a swinging scaffold through moment balance, lifting rings are installed at the four corners at the top part of the swinging scaffold, a steel plate is arranged at the bottom part of the swinging scaffold, and the rotational balance taking the swinging scaffold as the axis of rotation is realized, thereby ensuring the steady operation of the spray gun when the spray gun is operated.

The invention provides a method for reducing the stress of a passivation layer and a passivation layer stress buffer structure. The method for reducing the stress of the passivation layer comprises the steps of providing a design layout for defining the structure of a strip-shaped metal layer, the strip-shaped metal layer comprising at least one corner area, the corner area comprising a first corner larger than 180 degrees and a second corner smaller than 180 degrees, and the sum of the first corner and the second corner being 360 degrees; modifying the first corner and the second corner in the design layout to form stress buffer structures at the first corner and the second corner; and sequentially forming a metal layer and a passivation layer on the surface of a substrate according to the design layout, wherein passivation layer stress buffer structures are formed at the first corner and the second corner of the passivation layer. According to the method for reducing the stress of the passivation layer, the structure of the passivation layer is changed by changing the structure of the strip-shaped metal layer, so that the internal stress influence of the passivation layer is relieved, and defects at special positions of the passivation layer are reduced or avoided.

The invention discloses a hot molten slag maintaining furnace for producing mineral wool. The hot molten slag maintaining furnace comprises 1, a cylindrical shell, wherein the cylindrical shell is a cylindrical body which is hollow and has an open top, the periphery wall of the cylindrical body is provided with a water sleeve, an upper part of the cylindrical body is provided with a slag inlet, a lower part of the cylindrical body is provided with a slag outlet and an iron outlet, and the slag outlet is higher than the iron outlet, 2, a high-alumina brick layer which is arranged on a base wall of the cylindrical body, 3, a first carbon brick layer which is arranged on the high-alumina brick layer, 4, a second carbon brick layer which is arranged on an inner wall of the cylindrical body, wherein the top surface of the second carbon brick layer aligns with a lower edge of the slag inlet, and 5, a clay brick layer is arranged on the top surface and the inner side wall of the second carbon brick layer. The hot molten slag maintaining furnace for producing mineral wool can effectively adjust components of hot molten slag, is durable and has a low maintenance cost.

The invention relates to a preparation method of spiral cylindrical polypyrrole, which mainly comprises the following steps: A. preparing a hydrosol in which the molar concentration of sodium indigo disulfonate is 0.0025-0.0075 mol/L; B. taking 180ml of hydrosol, adding 1.38ml of pyrrole, and magnetically stirring in a 0-7-DEG C ice bath for 15-25 minutes to obtain a reaction mixed solution; C. preparing an initiator solution in which the molar concentration of FeCl3 is 0.03-0.15 mol/L; D. dropwisely adding 20ml of the initiator solution into the reaction mixed solution, magnetically stirring in a 0-7-DEG C ice bath to react for 4.5-9 hours, and carrying out vacuum filtration to obtain a solid; and E. cleaning and drying. The spiral cylindrical polypyrrole prepared by the method has the diameter of micrometer to nanometer magnitude, has better magnetic loss effect and nano loss effect on electromagnetic waves, and has the advantages of simple preparation technique, low manufacturing cost and stable product performance.

The embodiment of the invention provides a positive pole piece, an electrochemical device and an electronic device. The positive pole piece comprises a current collector, a first layer and a second layer. The first layer includes at least one selected from a ceramic material, a carbon-based material, a first active material, and an organic material. The second layer is disposed between the currentcollector and the first layer, the second layer includes a second active material, and the surface of the second layer is alkaline. According to the invention, the second layer is arranged between the current collector and the first layer, direct contact between the second layer with the alkaline surface and a diaphragm coating is avoided, such that the chemical damage effect of the second activematerial of the second layer on the diaphragm coating is avoided, the adhesion force between a positive electrode sheet and a diaphragm is improved, deformation of the electrode assembly during use is improved, and the service life of the electrochemical device is prolonged.

The invention provides a preparation method of graphene immobilized laccase. The graphene immobilized laccase is prepared by immobilizing laccase to a carrier of two-dimensional crystal material having excellent conductivity through nonspecific adsorbing action. The preparation method comprises the steps of preparing the carrier and immobilizing laccase; particularly, the carrier, graphene, is prepared by using a phenol as a raw material to carry out graphitization on sandwiched FePO4/dodecylamine nanolayer composite, and stripping before synthesis; the immobilized laccase is immobilized by adsorbing laccase to the surface of the evenly dispersed graphene in nonspecific manner, centrifuging, washing, and drying to obtain the finished immobilized laccase. The carrier of graphene herein helps increase electron transfer rate of enzymatic catalytic reaction process and improve reaction efficiency; the immobilized laccase prepared via the preparation method has high fixing quantity, high activity and good stability, can be recycled from the reaction system, and is reusable; the preparation process is simple and feasible.

Provided is a selective transfer method including depositing a thin film on a substrate; patterning the thin film using a laser or a tool to acquire a thin film of a target pattern; masking the thin film of the target pattern; selectively controlling a surface wettability through surface treatment of the masked thin film; delaminating the thin film of the target pattern by dipping a surface of the thin film with a wettability changed in response to a completion of the selective surface treatment into a liquid material and by applying a crack opening force capable of delaminating an interface between the thin film and the substrate; and immersing a target substrate into the liquid material when the thin film of the target pattern is floating in the liquid material and then scoop-up transferring the floating thin film of the target pattern.

The invention provides a polyurethane coating for indoor waterproofing. The appearance of the polyurethane coating is white and light gray, and from the color, the polyurethane coating can be directlydetermined no dark toxic and harmful substances such as black coal tar and coffee liquid cumarone are added; moreover, the polyurethane coating is suitable for the applying spraying construction technology to solve the problems such as the great difficulty in polyurethane coating scraping construction and the difficulty in quality control. The invention also provides the preparation and construction technology of the polyurethane coating. The preparation technology specially prepares a two-component water-based epoxy coating to be rolled and coated onto a base surface, and so that dust of thebase surface is wrapped and consolidated, the bonding strength of the base surface is improved, and as an interface agent at the same time, and the two-component water-based epoxy coating seals the base surface to meet construction requirements of the polyurethane waterproof coating on a wet base surface. By beating and covering the surface of the polyurethane waterproof coating with special sandlayer, the problem of subsequent plastering and tiling on the wall faces of the polyurethane coating is solved. At the same time, the construction of the layer has a very good protective effect on apolyurethane coating layer, and coating exposure to ultraviolet damage is avoided.

The invention relates to pseudo-ginseng health-maintaining porridge. The pseudo-ginseng health-maintaining porridge is prepared from pseudo-ginseng, eucommia bark, medlar, Chinese dates, lily, lotus seeds, peanuts, fresh milk, rice and the balance of water. A cooking method of the pseudo-ginseng health-maintaining porridge comprises the following steps: 1, cleaning the raw materials except for milk and edible salt or sugar for later use, and wrapping and binding pseudo-ginseng and eucommia bark by gauze; 2, stewing a proper amount of water, pseudo-ginseng and eucommia bark in a pot, and after water is boiled for 10-15 minutes, pouring the cleaned raw materials in the pot for stewing; and 3, stewing for 45-80 minutes, after rice soup is thick and rice is cooked, taking out pseudo-ginseng and eucommia bark which are wrapped by the gauze, pouring the fresh milk and the sugar or salt in the pot, and uniformly mixing to obtain the pseudo-ginseng health-maintaining porridge. The pseudo-ginseng health-maintaining porridge disclosed by the invention has functions of invigorating the circulation of blood, reducing blood lipid, tonifying deficiency, enriching blood, softening blood vessels, alleviating pains, dispelling wind, tonifying kidney and the like, can prevent coronary heart disease and stenocardia, and has a good curative effect for rheumatalgia, soreness and pain of waist, poor health, inappetence, neurasthenia, over fatigue, hemorrhage, and anemia.

The invention discloses a lightning protection device for a metal chimney of a boiler room. A lightning arrester fixing assembly is arranged and is in insulated connection with a smoke cap of the metal chimney, a downlead fixing assembly is arranged and is in insulated connection with a barrel body of the metal chimney, thus, physical and chemical damage to the metal chimney caused by high temperature in a welding mode can be avoided, electrochemical corrosion to the metal chimney possibly caused by contact of different metal materials with the metal chimney can be avoided, and therefore the service life of the metal chimney of the boiler room can be prolonged.

The invention relates to the technical field of light diffusion plates, in particular to a light diffusion plate of a direct type backlight module. The light diffusion plate includes 90%-91% of optical-grade PC particles or optical-grade PMMA particles, 1%-1.5% of printing ink, 1%-2% of organic silicon particles, 0.3%-0.6% of an adhesive, 0.4%-0.8% of a styrene copolymer, 5.8%-2% of titanium dioxide, 0.5%-0.7% of an electrostatic agent, 0.5%-0.7% of a flame retardant and 0.5%-0.7% of an ultraviolet light absorber. The manufactured light diffusion plate is in a slope shape, and the adhesive is one of polyurethane, polystyrene and ethylene. The flexibility of the light diffusion plate can be improved, the light diffusion effect of the light diffusion plate is better, light refraction can be reduced to improve the diffusion brightness of the light diffusion plate, mainly, the light layout and components are controlled more efficiently, the light is scattered through a light source, light is fully poured out, the light diffusion efficiency is improved, and a diffusion plate protection material is added to avoid some chemical damages.