33results about How to "Small viscosity coefficient" patented technology

The invention relates to a dispensing device which comprises a glue tube, an upper end, a dispensing part and a heating device, wherein the upper end is connected with the glue tube and the dispensing part; the heating device is arranged on the upper end and comprises a heater, a temperature sensor and a controller; the heater is used for heating glue flowing into the upper end; the temperature sensor is used for sensing the temperature of the heated glue; the controller is electrically connected with the heater and the temperature sensor respectively and used for receiving the temperature sensed by the temperature sensor so as to control the temperature of the heater heating the glue according to the temperature. The invention also relates to a dispensing method.

The invention discloses a passive heat removal system of a boiling-water reactor based on the characteristics of a nanometer fluid and belongs to the technical field of equipment and safety of nuclear power stations. The system consists of a valve controller, a water tank, a circulating pipeline, a valve and the like. In the case of unavailability of a station power supply, the quick removal of heat in the boiling-water reactor is realized by using the higher heat transfer characteristic and lower viscosity coefficients of the nanometer fluid and higher natural circulation capacity. The aims of preventing radioactive materials from being discharged and protecting the public and environments are fulfilled. When a severe accident occurs, a safety assurance function is executed and realized. The system is good in backup safety, simple in flow, stable in performance, high in reliability, convenient for implementation and simple to control.

The invention discloses a preparation method of Pt-Co / C-single-layer graphene for a fuel cell, belongs to the chemical synthesis field, and relates to a preparation method of graphene. The Pt-Co / C-single-layer graphene for the fuel cell is prepared by the following steps: (1), preparation of graphite oxide; (2), pre-treatment of active carbon XC-72; and (3), preparation of an rGO-XC-72 composite carrier-loaded Pt-Co alloy nano particle. The metal alloy nano particle-graphene and XC-72 active carbon composite catalyst prepared by utilizing a microwave ethylene glycol auxiliary reduction method is simple and easy to implement, and is high in efficiency. Moreover, the obtained graphene has a single-layer structure and the alloy particle has uniform particle diameter distribution and an average particle diameter of 1.5 nm. The catalytic activity of the nano particle can be improved by interaction with the XC-72 active carbon as well as electronic modification to the metal nano particle. And obtained catalyst has excellent oxygen-reduction electro-catalysis performances.

The invention discloses a leak detection method for chemical pipelines. The leak detection method comprises the following steps that pipeline welding lines to be detected are sealed and wrapped to form sealed space, and then mixed gas of nitrogen and helium is injected into a plurality of pipelines in a sealed mode; the sealing wrappage of the pipeline welding lines to be detected is opened, a helium mass spectrum leak detector is used for detecting whether gas leakage occurs or not in the pipeline welding lines to be detected, the helium is small in molecular weight and viscosity coefficientso that the helium can easily spread through leak holes to form pressure in the pipelines, the helium content is detected by a gas analyzer to determine whether the leakage rate of a pipeline system meets the working condition requirements by using the easy penetration of helium, and the safe operation of the system is ensured. One-time production can be successful, the method is simple, the mixedgas of nitrogen and helium is adopted, the detection cost is reduced, and the operation safety of the pipelines is improved.

The invention belongs to the technical field of protein preservation, and in particular relates to a buffer and a preparation method for the preservation of superparamagnetic particles and their protein junctions. The buffer used for the preservation of superparamagnetic particles and their protein connectors includes the following components: disodium hydrogen phosphate dodecahydrate, sodium dihydrogen phosphate, sodium chloride, bovine serum albumin, sucrose, xanthan gum , sodium alginate, gelatin. The buffer provided by the present invention can store the connection between micron-sized superparamagnetic particles and superparamagnetic particles and specific proteins for a long time, so that it will not fail due to physical effects (such as sedimentation and hardening); it is a kind of Special buffer for long-term storage of superparamagnetic particles and their protein conjugates.

A detachable heat exchanger plate bundle composed of all-welded plate tubes, including corrugated plates and inserts, and the corrugated plates have holes at their near ends respectively, and the holes are a medium inlet and outlet. A sealing gasket groove is set at the entrance and exit of the medium; the two corrugated plates are buckled together, and the convex corrugations on them are in contact with each other, and the surrounding strips are added, and welded together to form a fully welded plate tube. A channel for fluid circulation is formed in the tube; two of the plate tubes are stacked together, and a sealing gasket is fitted in the sealing gasket groove to form a plate bundle, and the channel formed between the plate tubes is another A channel for fluid circulation; the plate bundles are fixed together by bolts, thereby forming a detachable heat exchanger plate bundle. The invention solves the problem of easy blockage of plate bundles in actual work.

The invention discloses a modified composite barite for drilling fluid. The barite is composed of composite barite, modifier sodium hexametaphosphate, acrylic copolymer, octylphenol polyoxyethylene ether-30, polyoxyethylene Made of ethylene glycol 400. The modified composite barite is based on the composite of ultrafine barite and barite, and is improved by using sodium hexametaphosphate and an acrylic copolymer hyperdispersant synthesized with phthalic anhydride, acrylic acid, and n-butanol as monomers. The surface properties of the weighting agent, supplemented with surfactants octylphenol polyoxyethylene ether-30, polyethylene glycol 400 to further enhance its hydrophilic dispersion performance to obtain modified composite barite, suitable for water-based drilling and completion fluids , excellent suspension, the density reduction rate of the drilling fluid system after weighting is less than 3%; the acid solubility rate is ≥ 45%; the viscosity coefficient of the filter cake of the drilling fluid system is more than 30% lower than that of conventional barite; the apparent viscosity before and after adding calcium sulfate Rate of change ≤ 3mPa·s.

The invention relates to a transformer oil-gas detection device, which comprises a transformer, wherein a valve A and a valve B are arranged on the side wall of the transformer, one side of the valve A is communicated with an insulating oil inner cavity of the transformer, and the other side of the valve A is sequentially communicated with a one-way valve B, a sampling device, a filtering device, a cooling device, an oil pump, an oil pressure detector, and an oil-gas separation device; one side of the valve B is communicated with an insulating oil inner cavity of the transformer, and the other side of the valve B is sequentially communicated with a one-way valve A, an exhaust device and an oil-gas separation device; a gas outlet of the oil-gas separation device is sequentially communicated with a gas pump and a gas storage chamber, and a sampling gas outlet of the gas storage chamber is communicated with a chromatographic column; one side of the chromatographic column is communicated with a thermal conductivity cell detector, and the other side of the chromatographic column is communicated with the gas storage chamber; and a control board is electrically connected with the oil pump, the oil pressure detector, the gas pump and the thermal conductivity cell detector. The transformer oil-gas detection device has the advantages of being automatic in monitoring, high in safety, long in service life, low in cost, high in detection precision, and reliable in performance.

The invention relates to the field of display technology, in particular to a liquid crystal cell, a manufacturing method thereof, and a display device. The liquid crystal box includes two substrates and a liquid crystal layer located between the two substrates, and the display modes of 2D and 3D are switched by controlling the deflection of the liquid crystal layer; the liquid crystal layer is provided with ferroferric oxide nanoparticles. The liquid crystal box and its manufacturing method and display device provided by the present invention can reduce the viscosity coefficient of liquid crystal to the greatest extent by adding iron ferric oxide nanoparticles that can generate heat under the action of voltage in the liquid crystal layer, thereby improving the 3D liquid crystal display device. Faster response speed, improving naked-eye 3D LCD display effect.

The invention relates to a wind-guiding chemical grouting device, and further relates to a method for grouting through the wind-guiding chemical grouting device. The wind-guiding chemical grouting device comprises a grouting pump, an air compressor, a wind-thick liquid mixer and a corresponding pipeline, wherein the wind-thick liquid mixer is arranged in the middle of the pipeline and is provided with a wind inlet pipe, a thick-liquid inlet pipe and a thick-liquid outlet, the wind inlet pipe is connected with a first wind outlet pipe of the air compressor, the thick-liquid inlet pipe is connected with a thick-liquid outlet pipe of the grouting pump, the thick-liquid outlet is connected with a grouting buried pipe, a second wind outlet pipe led out from the air compressor is connected with a wind inlet buried pipe, and the front end of the wind inlet pipe, the front end of the thick-liquid inlet pipe and the wind inlet buried pipe are respectively connected with a valve. The wind-guarding chemical grouting device and the grouting method of the wind-guiding chemical grouting device achieve continuous processing of wind compressing, wind-thick-liquid mixing and pure-thick-liquid compressing processes, water is driven by wind, and therefore thick liquid is prevented from reacting with the water in the grouting process and congestion is avoided.

The invention discloses a liquid crystal polarization grating cascade device and a diffraction angle control method thereof. The device includes a twisted nematic liquid crystal cell, a broadband quarter-wave plate and a liquid crystal polarization grating in sequence from left to right, wherein the twisted nematic liquid crystal The cell and the broadband quarter-wave plate are combined into a polarization converter, which is used to realize the polarization conversion of the incident light and complete the diffraction angle control of the liquid crystal polarization grating. In addition, a liquid crystal polarization grating thin film cascade device includes N basic units, N≥1, the basic units are arranged vertically and parallel, and an air layer exists between the cascades of the basic units, and the basic units sequentially include from left to right For the polarization converter, the first liquid crystal polarization grating and the second liquid crystal polarization grating, the incident light will undergo first-order diffraction after passing through the first basic unit, and the diffracted beam of the former basic unit will become the incident beam of the latter basic unit, and will continue to diffract , to achieve 2 N A diffraction angle control.

The invention discloses a method for producing high-enzyme-activity pectate lyase by means of raw material pretreatment and feed fermentation. The method is implemented by liquefying treatment and feed-batch fermentation for starch in a feed culture medium. The method obviously increases unit volume enzyme activity and volume production efficiency of the pectate lyase. Due to enzyme liquefaction treatment to the starch in the feed culture medium, viscosity coefficients of liquid are greatly reduced, and stirring efficiency is improved. Logarithmic growth phase of fungi is prolonged by means of feed fermentation, and biomass liveweight is increased. Experiments show that fermentation coarse enzyme fluid of the pectate lyase with the poly galacturonic acid cracking enzyme activity of 531UmL-1 is obtained by the method, and the highest volume production efficiency reaches 13U(mL*h)-1. The method further has the advantages of low cost, short fermenting period, high equipment utilization rate, simple process and suitability for large-scale industrial production.

The invention discloses a high-temperature-resistant, efficient and environmentally-friendly full-ester-based drilling lubricant and a preparation method thereof. Polypropylene oxide, trimethylolpropane sebacate and isophorone diisocyanate methyl oleate react with trihydroxymethylpropionate, diglycol and stannous octoate to generate trimethylolpropane sebacate modified polyurethane, the trimethylolpropane sebacate modified polyurethane is mixed with ricinoleic acid, diethanol amine and boric acid, nitrogen is introduced by using a two-step decompression method in a continuous circulation way to generate trimethylolpropane mixed ester, and the trimethylolpropane mixed ester finally reacts with boronized amino ester to prepare the high-temperature-resistant, efficient and environmentally-friendly full-ester-based drilling lubricant. The novel high-temperature-resistant, efficient and environmentally-friendly full-ester-based drilling lubricant is prepared by introducing the nitrogen through a three-step reaction in the continuous circulation way and the two-step decompression method. The hydraulic friction, the viscosity coefficient of a mud cake, the torque of a drill column and the axial resistance can be greatly reduced by the lubricant, and the energy consumption is reduced; the trip time can be better shortened, the working resistance of a drill bit is reduced, and the service life of the drill bit is prolonged, so that the excellent properties such as the drilling working efficiency are improved.

The invention discloses a preparation method of a metal silver ordered porous array membrane. The preparation method comprises the following steps of coating a polystyrene ball solution on a substrate, carrying out plasma etching to obtain a substrate coated with an incompact ordered polystyrene ball template, mixing silver nitrate, hydrofluoric acid and water to obtain a nucleation solution, putting the substrate coated with the incompact ordered polystyrene ball template into the nucleation solution, carrying out horizontal standing sedimentation to obtain silver seed crystal nuclei growing between the polystyrene balls on the substrate, orderly adding ammonia water, acetic acid, hydrazine hydrate and water into the silver nitrate aqueous solution to obtain a growth solution, putting the substrate with the silver seed crystal nuclei growing between the polystyrene balls into the growth solution, carrying out horizontal standing sedimentation to obtain an intermediate product, and putting the intermediate product into a solvent so that the polystyrene balls are dissolved in the solvent and the metal silver ordered porous array membrane is obtained. The preparation method has the characteristics of low cost, simple process and high target product quality.