94results about How to "Guaranteed environmental performance" patented technology

The invention discloses an adhesive, which is mainly prepared from the following components in parts by weight: 50-60 parts of a sodium silicate solution, 10-20 parts of brine, 20-30 parts of nanosilicon dioxide, 6-8 parts of packing, 0.4-0.6 part of a modifying agent and 0.1-0.3 part of a stabilizer. The preparation method comprises the following steps: firstly mixing and dissolving magnesium chloride and magnesium sulfate at a certain molar ratio, and stirring to obtain brine; adding the sodium silicate solution to the prepared brine and adding the nanosilicon dioxide to the prepared sodium silicate-brine mixture, so as to obtain a mixture; adding the packing to the mixture, and stirring evenly, so as to obtain a semi-finished product; and adding the modifying agent and the stabilizer to the semi-finished product, so as to obtain an adhesive product. The adhesive disclosed by the invention can be applied to the vegetable fiberboard or the artificial board as an inorganic adhesive, does not release pollutants, and is low in cost; and the strength, the fire resistance and the water tolerance of the product can be significantly improved.

The invention discloses SBS modified emulsified asphalt based on high solid content SBS emulsion. The SBS modified emulsified asphalt based on the high solid content SBS emulsion is prepared from thefollowing components in parts by weight: 55 to 60 parts of matrix asphalt, 5 to 7 parts of high solid content SBS emulsion, 40 to 45 parts of water and 2 to 3 parts of an emulsifying agent. Accordingto the SBS modified emulsified asphalt based on the high solid content SBS emulsion, cyclohexane which is environmentally friendly and can enhance the stability of a system is selected as a solvent for dissolving SBS; a compound emulsifier with high surfactivity is preferred, so that the obtained SBS emulsion is high in stability and high in solid content; the modified emulsified asphalt is prepared by utilizing the SBS emulsion, and the characteristics of high solid content of evaporation residue, high softening point and the like can be shown; the obtained modified emulsified asphalt is applied to preventive maintenance of a road, and the advantages of high toughness and elasticity, low noise, strong rutting resistance and the like can be shown; therefore, the SBS modified emulsified asphalt based on the high solid content SBS emulsion is suitable to be popularized and applied.

The invention relates to an adhesive for wallpaper industry and particularly relates to sticky rice wet glue added with an emulsion stabilizer and a preparation method thereof. According to the invention, the emulsion stabilizer is added in a production process of the sticky rice glue to produce a sticky rice wet glue product. The sticky rice wet glue product has strong binding power and can be mixed with water 100%, the wallpaper adhesion area is increased, the decoration cost of users is reduced, the preparation process is simple, the production cost is low, and the product is stable to store and is convenient to use.

The invention relates to a high-performance polylactic acid blow molding thin film and a preparation method thereof, belongs to the technical field of biodegradable polymeric materials, and solves thetechnical problem of poor pure polylactic acid blow molding film-forming performance in the prior art. According to the high-performance polylactic acid blow molding thin film, polylactic acid with crystallization capacity serves as a raw material and is crystallized and blow-molded to form the thin film. The thin film can simultaneously have high strength, modulus, tensile breaking elongation and tearing strength in a horizontal direction and a vertical direction. The thin film overcomes the shortcoming of severe brittleness of the polylactic acid thin film and retains transparency and completely biodegradable environmental protection performance of the polylactic acid, so that a polylactic acid thin film product is widely used. Experimental tests show that the horizontal breaking elongation and the vertical breaking elongation of the thin film are 73% and 135%, and the horizontal tearing strength and the vertical tearing strength of the thin film reach up to 223KN / m and 183KN / m.

The invention discloses a system for desulphurization and denitration. The system comprises a tower body. A lower part of the tower body is provided with a flue gas inlet. The interior of the tower body corresponding to a position below the flue gas inlet is provided with an oxidization section. The interior of the tower body corresponding to a position above the flue gas inlet is orderly provided with a concentration section, an absorption section, a purification washing section and a demisting section from bottom to top. The invention also discloses a method for desulphurization and denitration by the system. The system for desulphurization and denitration has an ingenious and reasonable design, effectively solves the problem of a high operation cost, has stable processes, realizes absorption and concentration crystallization combination, does not produce waste liquid, limits ammonia escape and discharge and thoroughly solves the problems of ammonia escape and aerosol. The method for desulphurization and denitration has simple processes, realizes desulphurization and denitration, has high desulphurization and denitration efficiency, saves energy, is environmentally friendly, has a low cost, can be operated safely and stably, changes wastes into valuables, and indicates a key direction for environmentally-friendly desulphurization development.

The invention discloses a brake pad friction material. The brake pad friction material comprises phenolic resin, nitrile butadiene rubber, Lauren fiber, glass fiber, carbon fiber, graphite, petroleum coke, antimony sulfide, barium sulfate, a friction powder, tire powder, a friction increasing agent, aedelforsite, a fire retardant and meerschaum. The brake pad friction material with excellent environmental protection performance and high wearing coefficient is prepared by following steps: mixing of raw materials; grinding of raw materials; hot-pressing process, and moulding process.

The invention discloses a desulfurization and denitrification method. A system adopted in the method comprises a tower, wherein a flue gas inlet is arranged at the lower part of the tower, an oxidation section corresponding to the lower position of the flue gas inlet is arranged in the tower, and a concentration section, an absorption section, a purification and washing section and a demisting section corresponding to the upper position of the flue gas inlet are sequentially arranged in the tower. The invention further discloses the desulfurization and denitrification method of the desulfurization and denitrification system. The desulfurization and denitrification system is ingenious and reasonable in structural design, the problem of the high operation cost is effectively solved, the technology is stable, absorption and concentration crystallization are operated as a whole, no waste liquor is emitted, ammonia escape emission is limited, and the problems of ammonia escape and aerosol are thoroughly solved. The desulfurization and denitrification method has simple technological steps, realizes desulfurization and denitrification effects, has the characteristics of high desulfurization and denitrification efficiency, energy saving, environment friendliness, low cost and operation safety and stability, can turn waste into wealth and is a key direction of environment-friendly desulfurization development in future.

The invention relates to the technical field of shoemaking, and particularly relates to a 3D visual outsole glue spraying workstation and a using method thereof. The 3D visual outsole glue spraying workstation is characterized in that the 3D visual outsole glue spraying workstation comprises a support frame, an intelligent manipulator, a photoelectric sensor, a conveying platform, an electric control cabinet and a 3D contour scanner, wherein the electric control cabinet is arranged on one side of the support frame, the 3D contour scanner is arranged right above the feeding end of the conveyingplatform, the photoelectric sensor is fixedly arranged at the feeding end of the conveying platform, the intelligent manipulator is arranged on the inner top surface of the support frame, the conveying platform is horizontally arranged below the intelligent manipulator, a glue spraying gun is arranged on the claw seat at the tail end of the intelligent manipulator,a plurality of glue outlet smallopenings for spraying glue independently are formed in the glue spraying gun, and a cleaning device for cleaning the head of the glue spraying gun is arranged on one side of the support frame. According to the 3D visual outsole glue spraying workstation and the using method thereof, the overall structure is novel, the head of the glue spraying gun can be cleaned in time, and the spraying amount of glue is conveniently controlled; and in addition, the effect of spraying different types of glue can also be achieved.

The invention discloses a nitrogen supercharging vehicle which comprises a chassis, a chassis girder and chassis auxiliary beams, wherein the chassis is provided with an upload prying case body; the chassis girder is fixedly connected with the chassis auxiliary beams; the chassis auxiliary beams are fixedly connected with the upload prying case body; supercharging equipment is arranged in the upload prying case body; and the supercharging equipment comprises a gas inlet pipeline, a primary steam separator, a secondary steam separator, a tertiary steam separator, a supercharger, a diesel engine, a composite cooler, a gas exhaust pipeline and a control system. The whole equipment has the advantages of convenient and quick operation and maintenance, high work efficiency, high degree of automation control, energy saving, environmental protection, low requirements for working conditions, and convenient management, and provides a convenient high-pressure high-flow gas source for oil field drilling, gas exploitation and other related fields.

The invention provides a resin production system, comprising a polymerization reaction kettle, a vertical condenser, a horizontal condenser and a buffer recovery tank, wherein the polymerization reaction kettle is provided with a feeding hole and a gas outlet hole; the gas outlet hole is communicated with a tube pass entrance of the vertical condenser, a tube pass exit of the vertical condenser iscommunicated with a tube pass entrance of the horizontal condenser, a tube pass exit of the horizontal condenser is communicated with an inlet of the buffer recovery tank, and an outlet of the bufferrecovery tank is communicated with the gas outlet hole. The resin production system is provided with the vertical condenser and the horizontal condenser which are cooperatively used, thus guaranteeing the condensation effect of ethyl acetate gas; the buffer recovery tank is arranged, and the whole system is enabled to form a closed loop, so that the system is not limited by the high temperature vaporization of ethyl acetate, the cooling time is shortened, the system power consumption and energy consumption are reduced, the machine abrasion is reduced, and the production cost is further lowered; furthermore, part of the uncondensed ethyl acetate gas is recovered by means of the buffer recovery tank and is not discharged into the atmosphere, so that the pressure for environmental protectionis reduced.

The invention discloses a friction material for a brake pad, which is characterized by comprising epoxy resin, mica, Lauren fiber, glass fiber, mineral fiber, graphite, coke, antimony sulphide, barite, friction powder, tyre powder, friction adding agent, potassium feldspar, flame retardant and vermiculite. Through the steps of mixing the raw materials, grinding the raw materials, hot pressing process and shaping process, the preparation of the friction material for the brake pad is finished, so that the friction material for the brake pad with good environmental protection performance and high abrasion resistance coefficient is obtained.

The invention discloses a desulfurization and denitrification method of a desulfurization and denitrification system. The system comprises a tower body, wherein a flue gas inlet is formed in the lower part of the tower body; an oxidizing section is arranged at a lower position, corresponding to the flue gas inlet, in the tower body; a concentrating section, an absorbing section, a purifying and water washing section and a defogging section are sequentially arranged from bottom to top at an upper position, corresponding to the flue gas inlet, in the tower body. The invention also discloses a desulfurization and denitrification method of the desulfurization and denitrification system. The desulfurization and denitrification system provided by the invention is ingenious and reasonable in structural design, effectively solves the problem of high operation cost, and is stable in process; absorption, concentration and crystallization are carried out integrally, no any waste liquid is discharged, ammonia fugitive emission is limited, and the problems of ammonia escape and aerosol are thoroughly solved. The desulfurization and denitrification method provided by the invention is simple and easy in process steps, not only realizes the effects of desulfurization and denitrification, but also has the characteristics of high desulfurization and denitrification efficiency, energy conservation and environment protection, low cost and stable operation safety, and can make waste profitable.

The invention discloses a shielding cable for an environment-friendly car. A thermoplasticity irradiation vulcanized rubber insulation layer is arranged on the outer layer of a copper core soft conductor to form an insulation wire core, a plurality of insulation wire cores are stranded to form a cable wire, filling layers are arranged at gaps of the cable core, a belt wrapping layer, an inner shielding layer and an outer shielding layer are arranged on the outer portions of the filling layers and the cable core in sequence, and an outer protecting sleeve layer is arranged on the outermost layer of a cable. The filling layers are low-smoke-zero-halogen filling ropes. The inner shielding layer is a tinned copper wire braid shielding layer. The outer shielding is an aluminum foil lapping shielding layer. The outer protecting sleeve layer is a 125-DEG-C low-smoke-zero-halogen flame-retarding elastic body protecting sleeve layer. The shielding cable for the environment-friendly car has flame-retarding performance, high-temperature-resisting performance, low-temperature-resisting performance, acid-base-resisting performance, oil-water-resisting performance, anti-tearing performance, softness and environment-protecting performance.

The invention discloses a glutinous rice wet glue with high bonding strength, wherein the glutinous rice wet glue comprises the raw materials in parts by weight: 115-125 parts of a main material, 2-8parts of urea, 1-2 parts of hydrogen peroxide, 1-2 parts of sodium benzoate, 1-2 parts of a bactericide, 2-5 parts of an epoxidized soybean oil compound, 2-4 parts of sodium polyacrylate, 10-16 partsof alum, and 200-300 parts of deionized water. The main material comprises the raw materials in parts by weight: 60-80 parts of glutinous rice flour, 15-35 parts of japonica rice flour, 15-25 parts ofbaked dextrin, and 4-10 parts of carboxymethylated starch. The glutinous rice wet glue with high bonding strength is relatively low in cost, rich in raw material sources, high in bonding strength, safe, environmentally friendly, degradable and not easy to harden after being stored for a long time, and has the viscosity and stability improved.

The invention discloses catalyst composition for allantoin preparation and a preparation method of the catalyst composition. The preparation method comprises the steps as follows: 1) a molecular sieve, tetrabutyl titanate, a cerium source, sodium tungstate, amino acid, ethanol and water are subjected to a hydrothermal reaction, and a modified molecular sieve is prepared; 2) the modified molecularsieve is soaked in an acid solution and an active molecular sieve is prepared; 3) the active molecular sieve, aluminum oxide, diatomite, sodium dodecyl benzene sulfonate and rosin are subjected to ball milling, and the catalyst composition for allantoin preparation is prepared. The catalyst composition can efficiently catalyze synthesis of allantoin and has the advantages of being environmentallyfriendly and easy to recover, and besides, the preparation method has the advantages that the process is simple and raw materials are easy to obtain.

The invention discloses a high-flexibility anti-bending robot cable. A power system unit and a control system unit are stranded into a cable conductor; a cotton rope filling layer is arranged in a gap of the cable conductor; an aluminium foil shielding layer and a shielding layer woven with tinned copper wires are sequentially wrapped outside the cable core and the cotton rope filling layer; a thermoplastic elastomer outer sheath is extruded on the outermost layer of the cable; and each of the power system unit and the control system unit is formed by a conductor and a polyvinyl chloride insulation layer extruded on the outer layer of the conductor. The invention provides the high-flexibility anti-bending robot cable which has high flexibility, bending resistance, high wear resistance, anti-interference capacity, resistance to acid and alkali, oil-water resistance, tear resistance, high toughness, aging resistance and excellent weather resistance and simultaneously also has excellent electrical insulation property and environment-friendly performance.

The invention relates to the technical field of a plastic track, in particular to a manufacturing process of a polyether polyurethaneurea prefabricated plastic track. The process is characterized inthat a product structure is divided into three layers: a surface layer, a strong power layer and an elastic layer. The raw materials comprise terminated isocyanate, polysiloxane, hydroxyl-terminated polybutadiene, polyurethane polyurethane adhesives, talcum powder, kaolin, lead salt, organic tin, phthalocyanine blue, red clay, stearate, phthalate, EPDM rubber particles and damping particles. The process has the advantages that the thickness of the laid track has uniform thickness; the appearance is attractive; durability is realized; the level and grade of the sports field are greatly improved;the construction speed is high; the harmful smell radiation and pollution due to volatile matters generated during the plastic slurry laying and injection in the prior art on the environment can be avoided; the social benefits and the life quality of people are greatly improved.

The invention discloses a vehicle wheel hub balancing strip. The invention comprises a balancing strip main body (1) and an installing part arranged on the main body and used for installing the main body at the inner side of the wheel hub; the balancing strip main body (1) is a flexible outer sleeve with the both ends to be closed and a pipe cavity (2) inside; metal grains (3) are arranged in the pipe cavity (2); the volume of the residual space which is not occupied by the metal grains (3) in the pipe cavity is 1 / 3 to 1 / 2 of the total volume of the pipe cavity (2); the diameter of the metal grain (3) is equal to or smaller than 400 meshes; the metal grain (3) is a stainless steel grain or iron sand grain. The invention has the advantages that the cost is low, and the default that the wheel hub balancing because the non-balancing point test exists the error or the balancing strip equipment error is not ideal can be made up through effective automatic calibration (adjustment) of the wheel hub balancing.

The invention provides a PVC rubber material, and a preparation method and an application thereof. The PVC rubber material comprises the following components in parts by weight: 100 parts of PVC resin, 70 to 90 parts of a plasticizer, 20 to 60 parts of a filling agent, 4 to 12 parts of a heat stabilizer, 0.2 to 1.5 parts of a lubricating agent and 0.1 to 2 parts of an antioxidant. The surface of the PVC sizing material provided by the invention is matte, fine, smooth, soft and good in elasticity; meanwhile, the oil resistance of the PVC sizing material is particularly excellent. Furthermore, the PVC rubber material provided by the invention has excellent processability, and is convenient for extrusion production of manufacturers. In addition, the PVC rubber material provided by the invention can ensure the environmental protection performance of a material, and completely meets the requirements of European Union ROHS certification and REACH certification.

The invention relates to a WPC floor which comprises the following components in parts by weight: 73.85-78.04 parts of PVC resin powder, 73.51-77.49 parts of stone powder, 10.12-15.71 parts of regulator, 4.12-4.95 parts of stabilizer, 3.87-4.21 parts of reinforcing agent, 0.47-0.82 parts of internal lubricant, 0.58-0.92 part of PE wax, 0.8-1.2 parts of oxidized paraffin and 1.18-1.55 parts of foaming agent. The invention has the advantages that the WPC floor is prepared from PVC resin powder, stone powder, regulator, stabilizer, reinforcing agent, internal lubricant, PE wax, oxidized paraffinand foaming agent; the environment-friendly nontoxic and odorless renewable resource of the PVC resin powder is capable of guaranteeing the overall environment-friendly effect and excellent plasticityof the WPC floor, 100% recycling of the WPC floor and no air pollution or environmental pollution caused by the WPC floor; the invention also discloses the WPC floor and the preparation method of theWPC floor.

The invention discloses activated carbon feeding equipment having an environmentally friendly function. The equipment includes a frame, an electronic box arranged on one side of the frame, and a sensor connected to the electronic box; the upper part of the frame is provided with a charging barrel; the lower part of the charging barrel is connected to a hopper which is wide at the top and narrow atthe bottom; the frame is provided with a motor located right under the hopper; the upper part of the motor is provided with a speed reducer connected to the motor; a disc feeder is fixed in the portat the lower part of the hopper, and blocks and seals the port on the lower end of the hopper; and the upper surface of the disc feeder is provided with a feeding groove relative to the port on the lower end of the hopper. The equipment can effectively avoid the occurrence of the accumulation or remaining of active carbon during the discharging of the charging barrel, so that the normal conveyingof the active carbon can be guaranteed, adjusting can be performed on the negative pressure in a conveying pipeline, the feeding speed of the active carbon can be changed in real time, the precise feeding of the active carbon can be simultaneously guaranteed, and therefore, the best adsorption effect of dioxin can be achieved.

The invention discloses a turboprop engine-based hybrid power unmanned aerial vehicle and a take-off and landing control method thereof. The unmanned aerial vehicle comprises an vehicle body, a left wing, a right wing, a left aileron, a right aileron, a left flap, a right flap, a main propeller, a left wing motor, a left wing propeller, a right wing motor, a right wing propeller, a horizontal stabilizer, a vertical stabilizer, an elevator, a rudder, a turboprop engine, a turboprop engine reducing mechanism, a clutch A, a clutch B, an inverter, a power generation / electric all-in-one machine, astorage battery pack, an oil tank, a temperature sensor, a pressure sensor, a state-of-charge estimation module and a control module. the turboprop engine and the motors are jointly arranged on the unmanned aerial vehicle, so that the unmanned aerial vehicle has multiple flight modes and can well adapt to various flight requirements; and in addition, the turboprop engine is higher in efficiency, better in stability and longer in service life compared with a piston engine, and cheap aviation kerosene can be used for the turboprop engine.

The invention relates to the technical field of power equipment and discloses an energy-saving environmental-friendly gas turbine. The energy-saving environmental-friendly gas turbine comprises a body. A containing platform is fixedly connected to the bottom end in the body. A fuel gas working unit is fixedly connected to the top end of the containing platform. A first connecting pipe is fixedly connected to one end of the fuel gas working unit. A recycling box is fixedly connected to the end, away from the body, of the first connecting pipe. A thermal insulating layer is fixedly connected to the inner wall of the recycling box. A recycling cavity is formed in the inner side of the thermal insulating layer. A water injection opening is fixedly connected to one side of the top end of the recycling box. A first heat exchanger is fixedly connected to the bottom end of the water injection opening. A heating pipe is fixedly connected to the bottom end of the first heat exchanger. According to the energy-saving environmental-friendly gas turbine, by arranging the first heat exchanger and a second heat exchanger, the first heat exchanger is filled with cold water, when high-temperature exhaust passes the recycling cavity, the heat of the exhaust is absorbed by the cold water and the exhaust is cooled, meanwhile the temperature of the cold water rises due to the heat of the exhaust, and the water flows out of a water outlet and is used for other processes.

The invention discloses a folding property detection system for high-performance concrete. The system comprises a base, a notch is formed in the top end of the base, a protective cover is fixedly connected to the top end of the base, and a positioning adjusting mechanism is arranged in the notch. The positioning adjusting mechanism comprises a fixing plate, a limiting rod, a rotating block, a moving platform, a sleeve, a supporting column, a containing plate, a protruding block, a lead screw, a rotary knob, a belt, a supporting plate, a supporting roller, a threaded rod, a rotating disc, a pressing rod, a rotating motor, a transmission gear, a pressing plate and a sliding rod. The system is scientific and reasonable in structure and safe and convenient to use;the positioning adjusting mechanism is arranged, the lead screw is driven to rotate through the rotary knob, two supporting plates are pushed to move to fix a concrete block, the stability of the concrete block is improved, the concrete block is prevented from deviating during a compression test, the compression test effect of the concrete block is ensured, and meanwhile, the rotating disc is rotated to drive the threaded rod to rotate and push the moving platform to slide along a notch.

The invention discloses a desulfurization and denitrification method of a desulfurization and denitrification system. The system comprises a tower body, wherein a flue gas inlet is formed in the lower part of the tower body; an oxidizing section is arranged at a lower position, corresponding to the flue gas inlet, in the tower body; a concentrating section, an absorbing section, a purifying and water washing section and a defogging section are sequentially arranged from bottom to top at an upper position, corresponding to the flue gas inlet, in the tower body. The invention also discloses a desulfurization and denitrification method of the desulfurization and denitrification system. The desulfurization and denitrification system provided by the invention is ingenious and reasonable in structural design, effectively solves the problem of high operation cost, and is stable in process; absorption, concentration and crystallization are carried out integrally, no any waste liquid is discharged, ammonia fugitive emission is limited, and the problems of ammonia escape and aerosol are thoroughly solved. The desulfurization and denitrification method provided by the invention is simple and easy in process steps, not only realizes the effects of desulfurization and denitrification, but also has the characteristics of high desulfurization and denitrification efficiency, energy conservation and environment protection, low cost and stable operation safety, and can make waste profitable.

The invention relates to the field of coatings, the invention discloses a spraying coating, and a preparation method and a spraying method thereof. The spraying coating is prepared from 40 to 45 partsof a waterborne epoxy resin emulsion, 5 to 10 parts of a waterborne acrylic emulsion, 0.5 to 2 parts of propylene glycol butyl ether, 0.5 to 1.5 parts of a dispersoid, 1 to 2 parts of a dispersing agent, 0.1 to 0.5 part of a leveling agent, 0.04 to 0.05 part of antifoaming agent, 20 to 25 parts of deionized water, 1 to 2 parts of a pigment and 1 to 2 parts of a filler. According to the spraying coating prepared by the invention, deionized water is used as a diluent; impurity introduction can be further avoided; the waterborne acrylic emulsion is added, the spraying coating can be matched withwaterborne epoxy resin emulsion to obtain the spraying coating which is easy to spray, good in adhesive force and toughness; spraying can be carried out more quickly and better; the propylene glycolbutyl ether is added, so that the coalescence performance of the spraying coating is improved, the toxicity of the propylene glycol butyl ether is extremely low, the environment-friendly performance of the spraying coating can be guaranteed, the dispersoid and the dispersing agent are added, stirring and dispersing can be better and faster conducted in the spraying coating preparation process, andthe more uniform spraying coating is obtained.

The invention discloses a medium-voltage flame-retardant power cable. The power cable comprises conductors, main cable cores, auxiliary cable cores and a middle cable core. Insulating layers are wrapped on the conductors in an extruding mode to form insulating cable cores, a fire-resistant oxygen isolating layer made of ceramic silicone rubber materials is wrapped on every three corresponding insulating cable cores in a lapping mode after the three insulating cable cores are stranded together, and outer semiconducting shielding layers are arranged outside the fire-resistant oxygen isolating layers to form the main cable cores. Each auxiliary cable core is formed by wrapping a fire-resistant oxygen isolating layer made of ceramic silicone rubber materials on two insulating cable cores in a lapping mode. The middle cable core is an insulating cable core. A polyurethane wrapping tape layer is wrapped on a cable core in a lapping mode after the cable core is formed by the main cable cores, the auxiliary cable cores and the middle cable core, and an outer semiconducting master shielding layer and an outer protection layer made of low-smoke zero-halogen flame-retardant polyolefin materials are sequentially arranged outside the polyurethane wrapping tape layer. Four control cable cores are arranged in the polyurethane wrapping tape layer. The power cable has high environment friendliness, produces less smoke and does not produce harmful hydracid substances when burnt and further has high fire resistance.

The invention discloses indoor dust safety purification equipment, and belongs to the field of environmental protection. The indoor dust safety purification equipment comprises a purification box, wherein the top end of the purification box is provided with a water inlet pipe; the purification box is communicated with an exhaust pipe; the outlet end of the exhaust pipe is movably connected with arotary spray disc; the inlet end of the exhaust pipe is in threaded connection with a plurality of groups of exhaust branch pipes; a rotary drum is movably arranged in a purification box; multiple groups of turnover plates are uniformly arranged on the outer wall of the rotary drum; a water pumping pipe is arranged in the purification box; a filter screen is arranged at the inlet end of the waterpumping pipe; the inlet end of the water pumping pipe is at the bottom end of the purification box; a spraying pipe is arranged at the outlet end of the water pumping pipe; a heater and an ultravioletsterilization lamp are installed on the inner wall of the top end of the purification box; an air outlet hopper is arranged on the inner wall of the top end of the purification box and is connected with one end of an air outlet pipe; and the other end of the air outlet pipe is in threaded connection with multiple air injection branch pipes. According to the indoor dust safety purification equipment provided by the invention, indoor air is subjected to dust removal through water filtration, spraying and the like, so that the indoor air is ensured to be clean and sanitary, the indoor environment-friendly effect is improved, the safety is improved, the comfort degree of the living environment is improved, and the convenience in use is realized.

The invention discloses a preparation method of high-yield allantoin, comprising: 1) subjecting molecular sieve, tetrabutyl titanate, a zirconium source, sodium tungstate, amino acids, ethanol and water to hydrothermal reaction to obtain modified molecular sieve; 2) soaking the modified molecular sieve in an acid liquid to obtain activated molecular sieve; 3) subjecting the activated molecular sieve, cyclodextrin, nitrates and water to contact reaction, and drying to obtain a catalyst to prepare allantoin; 4) subjecting glyoxal and nitric acid to oxidation reaction to obtain glyoxylic acid, and subjecting the glyoxylic acid, urea and the catalyst to condensation reaction to obtain allantoin. The preparation method imparts high yield to allantoin and has the advantages that environmental friendliness is achieved and the catalyst is easy to reclaim.

The invention relates to the technical field of medical paper-plastic bags, in particular to a medical paper-plastic bag with high bacterial resistance, a second surface layer is arranged above a first surface layer, three connected side edges of the first surface layer and the second surface layer are sealed through heat sealing edges, and openings are formed in the other side edges of the first surface layer and the second surface layer. The sealing device is novel in design, the environment-friendly effect can be achieved through repeated utilization, cost waste is reduced, the auxiliary sealing mechanism can enable an opening to be closed more tightly, the problem that gap bonding is not firm easily due to long-time opening and closing of mother and child sealing strips is solved, the sealing performance is improved, repeated use is convenient, internal gas can be emptied through the gas discharging mechanism, and the sealing effect is improved. And the stored instruments can be conveniently fixed through the object fixing assembly, the problem that bacteria enter the paper-plastic bag due to air leakage caused by the fact that the instruments pierce the paper-plastic bag is solved, and the overall bacterium blocking performance is improved.