88results about How to "Impede flow" patented technology

The invention relates to a linear water-based polyurethane thickener containing hydrophobic side bases and a preparation method of the linear water-based polyurethane thickener. The preparation method is characterized in that 40 weight percent to 60 weight percent of dibasic alcohol polymers, 10 weight percent to 30 weight percent of diisocyanate and 0 weight percent to 5 weight percent of catalysts are mixed, under the condition of N2 gas existence and the temperature being 50 DEG C to 100 DEG C, the stirring is carried out for 1 to 6 hours, then, 10 weight percent to 30 weight percent of end-capping agents are added, under the condition of the temperature being 50 DEG C to 100 DEG C, the stirring is carried out for 1 to 6 hours, polyurethane prepolymers are prepared, then, 5 weight percent to 20 weight percent of chain extenders are added into the prepared polyurethane prepolymers, the stirring is carried out for 1 to 6 hours under the condition of the temperature being 50 DEG C to 100 DEG C, and the linear water-based polyurethane thickener containing hydrophobic side bases is prepared. The linear water-based polyurethane thickener and the preparation method have the characteristics that no solvent exists, the toxicity is low, the environment is protected, the preparation process is simple, and the like. The prepared linear water-based polyurethane thickener containing hydrophobic side bases is applicable to the thickening of water-based paint, and the obvious thickening effect is realized.

A fire-proof paint modifier of tunnel based on polymer/clay inserting layer modification technology and its production are disclosed. The modifier consists of polymer, modified clay and additive, polymer is bromo-bisphenol A epoxy resin or amino resin solution, modified clay is insert modified roseite, concavo-convex rod clay or montmorillonite, and additive is expendable graphitic, magnesium hydroxide, aluminum hydrate and nanometer TiO2. The process is carried out by destroying clay structure, stripping it into basic unit, dispersing in polymer matrix, and obtaining modifier. Its advantages include better hydrophobicity and thermal stability, higher strength and toughness, to prevent smoke from eroding and improve corrosion and water resistances.

The invention provides a preparation method of a multifunctional layered joint cartilage support. The multifunctional layered joint cartilage support capable of simulating the biological property andthe mechanical property of natural cartilage is prepared by taking hydrogel as a support material, taking mesenchymal stem cells, cartilage cells and osteoblasts as inducing and developing objects andby adopting a 3D printing technology. The multifunctional layered joint cartilage support can accurately simulate the internal tissue form and the contour of each layer of the natural cartilage and can realize that different layers have different mechanical and biological characteristics. The prepared artificial cartilage support cells are derived from patients, the support serves as a degradablehydrogel material and the rejection reaction after implantation is greatly reduced. Various nutritional substances and growth factors are mixed in the hydrogel support, so that the sustained releaseeffect can be achieved and regulation and control of the growth and development of the artificial cartilage can be realized.

A protective sheath is provided to prevent mechanical damage to the working channel of the endoscope during insertion of the fiber, insulate the fiber from surrounding cooling fluids, and/or serve as an indicator of overheating that enables early detection of excess heating or burning of tissues or equipment at the treatment site. The protective sheath may include trim markings to facilitate cutting to a desired length, such as the length of the fiber in the scope, may also be arranged to glow when the fiber is pulled too far into the sheath, may be tightly fitted over the fiber to provide a plunger effect, and may include perforations to facilitate sterilization.

Provided is a hydrofoil (100), in particular a rudder, for water- borne vessels, in particular ships, with a trailing edge (20), in which the negative effects of vortex formation in the direction of flow behind the hydrofoil, and/or of Karman vortex streets, are reduced, a projecting body (30) is arranged at the trailing edge (20) for the purpose of reducing vortex formation.

The invention discloses an environment-friendly composite functional flexible fireproof cable. The cable comprises conductor cores, refractory layers, insulating layers, a waterproof layer, a fireproof inner protecting layer and a fireproof outer protecting layer which are sequentially arranged from the inside out, wherein each conductor core is formed by twisting a plurality of soft round copper wires with the same diameter in a layered manner; each refractory layer is processed by a synthetic mineral fireproof composite belt; each insulating layer is made from a 150-DEG C irradiate cross-linked polyolefin halogen-free insulating material; the waterproof layer is made from a heat-proof halogen-free low-smoke high-flame-retardancy material; the fireproof inner protecting layer is processed by a high-temperature resistant high-strength carbon fiber composite belt; and the fireproof outer protecting layer is made from an environment-friendly high-flame-retardancy low-smoke halogen-free polyolefin material. The environment-friendly composite functional flexible fireproof cable is an updated product of a traditional fireproof cable, has the favorable properties of fire resistance, low-temperature resistance, corrosion resistance, large current capacity, high mechanical strength, small size, light weight, long service life, sound grounding performance, good water resistance and the like, and is particularly suitable for occasions which are in strong radiation environments and demand smaller bending radii and high soft strength.

The invention provides pyridazine-group-containing diamine monomer and a preparation method and application thereof and belongs to the technical field of organic synthesis. The preparation method includes: adopting a nucleophilic substitution method to enable a dihydroxyl compound containing flexible group or asymmetric structure or bulky side group to react with chlorine-containing nitro pyridazine to obtain a dinitro intermediate containing a pyridazine structure, and reducing the dinitro intermediate to obtain diamine monomer containing a pyridazine structure; enabling the diamine monomer to react with dianhydride, and performing thermal imidization to obtain a high-performance heterocyclic polyimide film. The high-performance heterocyclic polyimide film maintains excellent thermal performance and mechanical performance that polyimide has originally, has solubility and photopermeability improved remarkably and has wide application prospect.

The invention discloses a cable bridge with convenient connection and a fireproof function, and belongs to the technical field of cable bridges. The bridge comprises N + 1 bridge units, each bridge unit comprises a bridge main body and a cover plate, the cover plate of the Nth bridge unit is slidably connected with the bridge main body of the N + 1th bridge unit, and the bridge main body of the Nth bridge unit is slidably connected with the cover plate of the N-1 bridge unit; a fire blocking wall which is perpendicular to the length direction of the bridge frame unit and is provided with a threading hole is inserted into the middle of the bridge frame unit, and an access hole is formed in a bottom plate of the bridge frame unit under the fire blocking wall; a containing cavity is formed inthe top of each bridge unit, through holes used for communicating the containing cavities with inner cavities of the bridge units are formed in the cover plates on the two sides of the fire blockingwall, and hot melt adhesives are arranged in the through holes. According to the cable bridge, the two adjacent bridge units are connected in a sliding mode, so that the whole cable bridge is convenient to mount and dismount quickly, and the fire blocking walls in the inner cavities of the bridge units can effectively prevent fire from flowing.

The invention relates to a high-strength high-thermal-conductivity die-casting aluminum alloy material and a preparation method thereof. The material comprises the following chemical components in percentage by weight: 6.0-10.0% of Si, less than or equal to 0.35% of Fe; 0.15% of Cu; 0.15 to 0.35 % of Ni; 0.4 to 0.8 % of Mn; 0.35% of Cr; 0.6 to 2.0 % of Mg; 0.25% of Zn; 0.25% of Ti; 0.1 to 0.6 % of rare earth La; and the balance of Al. The strength and thermal conductivity of the alloy can be improved, and the alloy is particularly suitable for being used in the fields of communication cases, radiators and the like, including electric vehicle radiators, 5G base station shells, LED lamp shells and the like.

The embodiment of the invention discloses a wastewater-free portable hydrogen generation device. The wastewater-free portable hydrogen generation device comprises a hydrogen generation device body and a hydrogen treatment mechanism. The hydrogen generation device body comprises a water tank and an electrolysis tank; the hydrogen treatment mechanism comprises a vertical humidification tank and a pressure chamber, and the humidification tank is used for increasing the humidity of hydrogen; the pressure chamber is a sealed box, the top of the pressure chamber is provided with a hydrogen inlet and a hydrogen outlet, and the bottom of the pressure chamber is provided with a drain port connected with the water tank; the hydrogen outlet is controlled by a first electromagnetic valve to open or close; the drain port is controlled by a second solenoid valve to open or close. According to the wastewater-free portable hydrogen generation device, vapor brought out in the hydrogen production process is collected through the pressure chamber, the water is pressed into the water tank again in a certain period through the prepared hydrogen, no additional driving component is needed, and thus the device is more compact, light and convenient to carry; the use period is long after one time of water addition, maintenance is not needed during the use, and the use is convenient.

A rainwater collector for smart home is disclosed, including a first windscreen, the first rain receiving plate is fixedly connected with the outer wall of the building, a first water baffle plate isfixedly connected to the first rain plate, the first water baffle plate is provided with a first water storage chamber, the upper end of the first rain receiving plate is provided with a water inlet hole communicated with the first water storage chamber, the controller controls the operation of the rainwater collector, at that same time, when the second rain catch plate moves downward to an inclined state, the rain water enters the second water storage chamber along the strip hole on the second rain catch plate, and the rotation of the motor will drive the rotation shaft to accelerate the discharge of the rain water into the water storage tank, so that the amount of the rain water is increased, and a good rainwater collection effect is achieved; the water flowing to the water storage tankis filtered through the filter screen and then filtered through the activated carbon and filter cloth, so that the collected rainwater reaches a good purification effect.

The invention discloses a wire drawing oil, and belongs to the field of lubricating oil. 2-mercaptobenzothiazole and 2-chlorohydrin as raw materials are taken as raw materials, firstly 2- hydrazinoethanol is prepared, and then the 2- hydrazinoethanol is introduced into boric acid, so that boron and nitrogen coordination structure which contains more active nitrogen elements and can form a five-membered ring or a six-membered ring in boric acid ester, the molecular chain is charged after optimization, steric hindrance becomes large, nitrogen-bearing molecular chain gets close to boron atom, andelectron is provided for boron atom lack of electron, so that the hydrolytic stability of the boron atom is improved, boric acid ester containing active elements B, S and N is absorbed onto the surface of drawing metal through physical absorption, abrasion of metal is reduced, then the boric acid ester is decomposed, the active elements are recombined to form a new chemical film, the occurrence rate of loss of the drawing metal is reduced, and the abrasion resistance is improved. The wire drawing oil solves the problems that the existing wire drawing oil is not easy in biodegradation, poor inenvironmentally friendly benefit, poor in film-forming property and difficult to achieve ideal lubrication effect.

The invention relates to a device for supporting or guiding lines in channels, especially in waste water channels, comprising a cable cup consisting of individual interconnected segments (3), receiving said lines, and comprising a bottom (1) with protruding side cheeks . According to the invention, the bottoms (1) of adjacent segments (3) are preferably made of sheet metal and are joined to each other in an articulated manner, and the protruding side cheeks (2) are made of a flexible material, preferably plastic.

The invention discloses a spiral reducing-continuous twisting extrusion die for a magnesium alloy high-performance plate. Comprising a feeding extrusion die, an outlet extrusion die, a middle torsion extrusion die, an inner die and an outer sleeve. A spiral variable cross-section torsion extrusion channel is arranged in the middle of the die body, and a die cavity is reduced in a gradient mode in the thickness direction and the width direction. According to the spiral twisting extrusion die, continuous twisting deformation of a plate blank in the circumferential direction can be generated through the spiral-line-shaped twisting extrusion channel, rotation and shearing strain of the blank are generated under the action of shearing stress, shearing and breaking of crystal grains are achieved, and compared with a traditional extrusion die, the spiral twisting extrusion channel can greatly increase the twisting radius, and the yield is improved. Therefore, the shear stress of the blank in the extrusion deformation process is improved, the purposes of refining grains and preparing special textures are achieved, and the comprehensive mechanical property of the formed plate is improved.

The invention relates to a natural gas hydrate gas sampling device, and the device is composed of a simulation sleeve 16, a simulation drill rod 17, a motor 10, a rock debris storage chamber 7, a liquid flow meter 3, a water pump 2, a water storage tank 1, a gas-liquid-solid three-phase separator 35, a gas filling port, an air pump 13 and a natural gas sampler. The simulation drill rod is disposedin the simulation sleeve, and is connected with the motor; a mixture inlet and a mixture outlet are formed in two ends of the simulation sleeve; the mixture inlet is connected with the rock debris storage chamber, the liquid flowmeter, the water pump and the water storage tank, the outlet is connected with the gas-liquid-solid three-phase separator, and the three-phase separator is connected withthe water storage tank; the simulation sleeve is provided with three gas filling ports; an arc-shaped baffle, a sliding rail and an adjustable screw are arranged at an inlet of the natural gas sampler, fixed baffles, adjustable baffles and adjustable bolts are arranged at two ends, parallel baffles are arranged in the sampler, and an outlet is connected with a gas flowmeter. Basic data and theoretical support are provided for solving the drilling risk caused by flow change of a flow field in a shaft due to natural gas hydrate decomposition.

The invention discloses an explosion-proof gas storage tank, which comprises a tank body. Two pressure relief valves are arranged on the side wall of the tank body. There is a cooling layer between the tanks, a water pump is provided on one side of the cooling liquid storage room, the water inlet of the water pump is connected with the cooling liquid storage room, the water outlet of the water pump is connected with the cooling layer, and the detection There is a pressure sensor and a thermocouple on the detection port, an alarm is installed on one side of the shell, the pressure sensor is connected to the alarm signal, and the thermocouple is connected to the water pump control unit to solve the problem of excessive temperature of the gas storage tank. , leading to a sharp rise in the pressure inside the gas tank, which is prone to explosion.

The invention discloses an aluminium alloy material containing iron complex purification. By mass percent, the component of the alloy is that Cu is less than or equals to 0.001%, Si is smaller than or equals to0.03% and Fe is smaller than or equals to 0.03%. The remaining are Al and unavoidable microscale impurities. The content of the impurities is smaller than or equals to 0.005%. A refining agent containing the manganese complex is 1ppm-0.05% of furnace material gross quantity. The air hole problem caused by caused by the fact that gas content is high in the aluminium alloy casting process is solved. The problem that a cleaning agent is added by a middle alloy under the normal condition is solved.

The invention relates to a preparation method of a lanthanum-containing anti-corrosion aluminum alloy material. The lanthanum-containing anti-corrosion aluminum alloy material is prepared from the following ingredients in percentage by mass: 4.5 to 5.5 percent of silicon, 0.5 to 1.5 percent of copper, 0.4 to 0.6 percent of lanthanum, and the balance of aluminum and inevitable impurities. The formula of the alloy is optimized through controlling the contents of different elements in the alloy, especially the content of iron. After the rare earth lanthanum is refined, galvanic corrosion reactionbetween an intermetallic compound and an aluminum substrate in the alloy is weakened, and the inherent excellent property of the alloy is not influenced. Secondary solution treatment and low temperature aging treatment are carried out on the alloy subsequently, and inactive elements such as Cu and Fe are fully dissolved, so that a galvanic corrosion influence between an aluminum base and other inactive alloy elements is further reduced. The corrosion resistance of the alloy material provided by the invention is greatly improved.

The invention relates to a silicon carbide semiconductor device and a preparation method thereof. Two sides of a trench gate dielectric layer are respectively provided with two heavily doped polycrystalline silicon trench regions of a second conductive type. Due to the energy band structure of silicon carbide and polycrystalline silicon, the area of a depletion region of a shielding region is reduced by the polycrystalline silicon trench region. The reduction of the area of the depletion region not only can reduce the electric field intensity at the corner of the protective trench gate medium, but also can slightly hinder electron flow, thereby reducing the resistance of the drift region. The polycrystalline silicon deposition process of the second conduction type is relatively simple, and the problems of depth and transverse diffusion caused by the traditional silicon carbide ion implantation process of the second conduction type are avoided by adopting the heavily doped polycrystalline silicon trench region of the second conduction type.