214results about How to "Meet application requirements" patented technology

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a high-performance rubber concrete material, which comprises the following steps: (1) carrying out ultrasonic treatment on rubber powder, rubber particles, water and tetraethoxysilane, adding a silane coupling agent, continuously carrying out ultrasonic treatment for 30 minutes, drying and sieving to obtain modified rubber powder and modified rubber particles; (2) uniformly mixing calcium fluosilicate, aluminum oxide and magnesium oxide, calcining at high temperature, adding blast furnace slag and silicon powder, and grinding and activating under pressure to obtain a reinforcing agent; and (3) uniformly mixing cement, fly ash and gypsum, adding water, stirring to obtain slurry, adding the modified rubber powder, the modified rubber particles and the reinforcing agent, then adding the functional additive, the short glass fiber and the medium sand, and uniformly mixing to obtain the rubber concrete. The compressive strength of the prepared rubber concrete is 42 MPa or above, the tensile strength ranges from 3.0 MPa to 4.0 MPa, the breaking strength ranges from 5.0 MPa to 6.0 MPa, and application requirements are met.

The invention discloses a band-gap reference circuit which comprises a band-gap reference core module used for superposing a positive temperature coefficient voltage and a negative temperature coefficient voltage to generate a band-gap reference voltage; and the reference output module is used for dividing the band-gap reference voltage to generate a reference voltage. Wherein the band-gap reference core module comprises a temperature excursion trimming unit, the temperature excursion trimming unit is used for trimming the temperature excursion of the band-gap reference voltage by adjusting the positive temperature coefficient voltage, and the reference output module further comprises a temperature excursion compensation unit used for adjusting the voltage division proportion of the reference output module. Therefore, the offset generated in the reference voltage in the temperature drift trimming process is eliminated. According to the band-gap reference circuit, it can be guaranteed that the reference voltage is not affected by the temperature condition, the consistency of the reference voltage can be guaranteed, and the application requirement is well met.

The invention discloses hot stamping die steel with high thermal conductivity. The hot stamping die steel comprises the following components: 0.30-0.35% of C; 0.03 to 0.15% of Si; mn: 0.05 to 0.20%; 0.10% to 0.30% of Cr; 3.00% to 3.30% of Mo; 1.10% to 1.30% of W; 2.00% to 2.30% of Ni; 0.70% to 0.90% of Co; 0.15% to 0.20% of Cu; 0.001% to 0.002% of Ce; la: 0.0005% to 0.001%; and the balance of Fe and impurities. According to the method, V is not used, meanwhile, the content of alloy elements such as Si and Cr is greatly reduced, the heat conductivity of steel is improved, the content of elements such as Mo, Ni, Cu, W, Co, La and Ce is improved, the purpose of age hardening is achieved, a special age hardening heat treatment process (namely a solid solution and age hardening mode) is combined, the hardness of the produced hot stamping die steel reaches 47-49 HRC, and the hardness of the produced hot stamping die steel is greatly improved. And the high-temperature strength, the high-temperature wear resistance and the high-temperature thermal fatigue performance of the material are greatly improved.

The invention belongs to the technical field of quartz sand preparation, and discloses high-purity quartz sand and a preparation method thereof. The method comprises the following steps: by taking water, mixed alkali and silicon powder as raw materials, uniformly stirring the silicon powder, the water and an additive to prepare silicon sludge, adding the rest raw materials into a reaction kettle, heating, then adding the silicon sludge into the reaction kettle in a frequency division manner, reacting to obtain a sodium silicate solution, removing anion and cation impurities, then adding an acid solution, heating to obtain silicic acid gel, and drying to obtain the silica gel. The silicic acid gel is subjected to freezing treatment, vacuum microwave drying and chloridizing roasting after unfreezing are conducted, and the high-purity quartz sand is obtained. According to the preparation method, the quartz sand with the purity higher than 99.9999% can be synthesized, the granularity of the quartz sand can be controlled according to the adding proportion of the acid solution, the content of gas-liquid inclusion in the quartz sand is remarkably reduced, and the quality of the quartz sand is improved.

The invention provides a polymer alloy material, a preparation method thereof and a flow cell panel frame, and belongs to the technical field of high polymer materials. The polymer alloy material comprises the following components: 25-80% of polyolefin, 10-20% of engineering plastic, 1-5% of a compatilizer, 5-50% of an inorganic filler and 0.1-5% of an auxiliary agent. Wherein the engineering plastic is selected from one or more of a styrene methyl methacrylate copolymer, a styrene-butadiene methyl methacrylate copolymer, polycarbonate, polyphenyl ether, polyphenylene sulfide, a styrene-maleic anhydride copolymer or a styrene-acrylonitrile copolymer. The polymer alloy material forms a bicontinuous phase structure with'sea-sea 'microscopic dispersion characteristic and tight interface bonding, can simultaneously have the characteristics of excellent heat resistance, corrosion resistance, high flow, low shrinkage, high modulus and the like, and makes up for the defect of insufficient performance of the existing liquid flow cell panel frame plate PP material.

The invention discloses a preparation method of high-oil-resistance nitrile rubber, which comprises the following components in parts by weight: 275 parts of soft water, 50-55 parts of butadiene and 45-50 parts of acrylonitrile, wherein the addition amount of butadiene and acrylonitrile is 100 parts; the emulsifier is a dodecylbenzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt composite system, and the dosage of the emulsifier is 2.5-5 parts; the initiator adopts persulfate, and the use amount of the initiator is 0.1-0.5 part; 0.1 part of triethanolamine; the preparation method comprises the following steps: synthesizing butyronitrile rubber cement by adopting an intermittent feeding mode of replenishing a molecular weight regulator in batches and a thermal polymerization process, adding a terminating agent and an anti-aging agent, and degassing, condensing, washing and drying to obtain a high-strength butyronitrile rubber product. The nitrile rubber has the Mooney viscosity ML (1 + 4) 100 DEG C of 90-120, the tensile strength of more than or equal to 27.5 MPa and the elongation at break of more than or equal to 450%, and can meet the application requirements in the fields of automobiles, aerospace, sealing washers and the like.

The invention discloses modified asphalt concrete and a preparation method and application thereof, and belongs to the technical field of asphalt concrete.The preparation method comprises the steps that sodium silicate, sodium hydroxide and water are stirred and mixed and then transferred into a stirring machine to serve as an alkali activator, and then fly ash, electrolytic manganese residues, cement, modified sugarcane fibers and fine sand are added into the stirring machine to be stirred and mixed; vibrating to discharge internal gas, standing, demolding and crushing to obtain geopolymer aggregate; the modified asphalt, the geopolymer coarse aggregate and the basalt fine aggregate are stirred and mixed in proportion, and the modified asphalt concrete is obtained; the geopolymer aggregate takes the electrolytic manganese residues and the fly ash as main raw materials, the utilization rate of waste resources is increased, and the modified sugarcane fibers are doped, so that the mechanical property of the geopolymer can be improved, and the application requirements of asphalt road aggregate are met. And compared with addition of steel fibers and polymer fibers, the sugarcane fibers are degradable and more environmentally friendly, and dismantling and recycling of temporary asphalt roads are facilitated.

The invention relates to the technical field of flexible electronics, and discloses liquid metal slurry and a preparation method and application thereof. The liquid metal slurry comprises a liquid metal Pickering emulsion; the liquid metal Pickering emulsion comprises liquid metal and a stabilizer; the liquid metal comprises gallium-based liquid metal; the stabilizer comprises cellulose nanocrystals. The liquid metal slurry provided by the invention does not have obvious sedimentation and agglomeration phenomena after standing for 24 hours, is good in stability and has the characteristics of Pickering emulsion, and emulsion microspheres in the liquid metal slurry are micron-sized, uniform in sphere and good in dispersity; the alloy ink obtained by centrifugally purifying the liquid metal slurry can be easily patterned on the substrate, has good adhesiveness with the substrate and low ink mark resistance, and has the potential of being applied to flexible electronics; in the Janus membrane provided by the invention, the compatibility of the liquid metal and the polymer matrix is relatively good, and the Joule thermal performance, the photothermal conversion performance, the softness and the elasticity of the membrane are relatively good.

The invention discloses a method for extracting a stable body from blue-green algae. The method comprises the following steps: S1, culturing the blue-green algae; s2, pretreating blue-green algae; s3, performing ultrasonic crushing; s4, performing differential centrifugation; s5, performing ultrafiltration; s6, carrying out ultracentrifugation; s7, density gradient centrifugation; and S8, removing peripheral proteins. The extraction method provided by the invention is high in extraction efficiency, stable and controllable in process, free of toxic and side products, green and environment-friendly, does not need high-temperature and high-pressure devices and large-scale instruments and equipment, expands the application scene, and reduces the application cost. The stable active particle biological material with high polyPn polymerization degree, high concentration and high purity can be obtained, the biological activity is high, the application requirements in the fields of food, daily chemicals and the like can be met, the strict requirements when the stable active particle biological material is applied to clinical medicine and scientific research are also met, and the stable active particle biological material has great practical application value and commercial prospects. The technical problem of preparing the stable active particle biological material in China is solved.

The invention discloses a single-ring absolute time grating angular displacement sensor and an absolute angular displacement value measuring system and method.The single-ring absolute time grating angular displacement sensor comprises a stator base body and a rotor base body, the rotor base body is provided with an induction electrode assembly and a reflection electrode assembly, and the stator base body is provided with an excitation electrode assembly and a receiving electrode assembly; the differential induction electrode assembly and the excitation electrode assembly are connected with the channel selector. The absolute angular displacement value measuring system comprises a single-circle absolute time grating angular displacement sensor with controllable electrode cycle number, a subtraction circuit, a shaping circuit and an FPGA signal processing system. According to the scheme, a single-loop absolute design is adopted, absolute coding of each position in the whole measuring range is achieved, the number of electrode cycles can be flexibly controlled, compared with a double-loop structure, the loop width, the circuit cost and the decoding and coding mode are greatly improved, and meanwhile the industrial use environment adaptability is improved.

The invention relates to the technical field of high polymer materials, and discloses a double-color gradient PVB (Polyvinyl Butyral) film and a preparation method thereof. The double-color gradient PVB film comprises a first surface layer, a sound insulation layer and a second surface layer which are arranged in a stacked mode. In the first surface layer, one side of a breadth center line contains a wedge-shaped gradient layer; the wedge angle of the wedge-shaped gradient layer is close to the width center line of the first surface layer; the breadth of the wedge-shaped gradient layer is smaller than 1 / 2 of the total breadth of the double-color gradient PVB film; the thickness of the wedge-shaped gradient layer is smaller than or equal to the thickness of the first surface layer. According to the double-color gradient PVB film, the design of the pure color area and the gradient color area is formed on the appearance, the light transmittance of the pure color area reaches 25% or below, and the light transmittance of the dark color part of the gradient color area reaches 5% or below; the sound insulation layer is arranged between the first surface layer and the second surface layer, so that the PVB film has sound insulation performance; and the PVB film also has good flexibility and stretch resistance.

According to the polypropylene random copolymer soft fiber special material and the preparation method thereof provided by the invention, the modified carbon nano tube obtained by sequentially performing surface modification on the purified carbon nano tube through the coupling agent, the polydopamine and the gelatin is added, so that the compatibility of the carbon nano tube and polypropylene can be remarkably improved; the polypropylene random copolymer resin and other auxiliaries are combined, so that the mechanical property of the special polypropylene material can be remarkably improved, and the application requirements of the special polypropylene material in the fields of high-end hygienic materials, medical ultra-soft materials and the like can be met.

The invention discloses a sandwich structure electrolyzed water composite diaphragm, a preparation method and application, the diaphragm is composed of a three-layer structure, the first layer is a PTFE / polymer / inorganic nanoparticle composite porous layer, the middle layer is a polymer / inorganic nanoparticle composite porous layer, and the third layer is a PTFE / polymer / inorganic nanoparticle composite porous layer. The preparation method comprises the following steps: firstly, horizontally coating a prepared membrane casting solution on a hydrophilic treated PTFE porous membrane, then flatly laying another hydrophilic PTFE porous membrane on the PTFE porous membrane coated with the membrane casting solution, and standing to form a three-layer composite wet-state membrane; and putting into a coagulating bath to form the electrolyzed water composite diaphragm with a sandwich structure. The implementation process is simple, the operation steps are easy to repeat, through innovation of the composite membrane structure, the scraping resistance, the bending resistance, the tensile property and the tear resistance of the diaphragm are enhanced, meanwhile, a three-dimensional porous structure is formed, and the surface resistance of the diaphragm and the hydrogen production energy consumption of an electrolytic cell can be effectively reduced.

The invention discloses a cashew nut shell oil modified phenolic aldehyde amine epoxy curing agent and a preparation method thereof. The cashew nut shell oil modified phenolic aldehyde amine epoxy curing agent is prepared from the following components in percentage by mass: 10-20% of low-molecular fatty amine, 15-30% of formaldehyde, 35-55% of cashew nut shell oil and 15-20% of organic alcohol. Performance detection shows that the cured product has the characteristics of quick drying and high hardness, has toughness and impact resistance similar to those of a polyamide curing agent, is also suitable for low-temperature curing under a normal-temperature curing condition, is low in price and has good curing performance compared with a common phenolic aldehyde amine epoxy curing agent, and is suitable for being used in the field of high-temperature curing. The epoxy resin is mainly suitable for epoxy floor coatings, building structural adhesives and the like.

The invention relates to the technical field of deep processing of natural products, in particular to water-soluble liquid curcumin as well as a preparation method and application thereof. Curcumin is used as a raw material, an antioxidant, a food surfactant and the like are matched, edible ethanol is used as a solvent, and a temperature control crystallization technology is adopted to prepare curcumin compound crystals; and with the curcumin compound crystal as a raw material and a surfactant as an auxiliary material, the water-soluble liquid curcumin which is high in content, good in stability and clear and transparent in solution is obtained by combining technologies such as temperature-controlled emulsification, heat preservation, dilution and the like. The product can meet the requirements on hue, clarity and stability of the curcumin aqueous solution in different application scenes, and is suitable for the fields of food, medicine, cosmetics and the like.

The invention relates to the technical field of high polymer materials, and discloses polyester resin for a high-gloss powder coating and a preparation method of the polyester resin. The polyester resin for the high-gloss powder coating is prepared from the following preparation raw materials: aliphatic polyol, S (-)-1, 1-diphenyl-1, 2-propylene glycol and a first polyacid composition, the first polyacid composition includes biphenyl dicarboxylic acid and a bio-based dibasic acid. According to the polyester resin for the high-gloss powder coating, provided by the invention, S (-)-1, 1-diphenyl-1, 2-propylene glycol, diphenyldicarboxylic acid and bio-based binary acid are introduced into a main chain structure, so that winding of a molecular chain of the polyester resin can be reduced, and reflection of the polyester resin to light rays can be greatly improved; the powder coating prepared from the polyester resin can form a high-gloss coating, and has good storage stability and weather resistance; the use of bio-based dibasic acid can also reduce the dependence on traditional petrochemical-based raw materials.

The invention relates to an MIPI-based video stitching method and system and a storage medium, and the method comprises the steps: S1, receiving at least two paths of MIPI video signals, carrying out the unpacking, and recovering a video time sequence; s2, caching the MIPI video signals after the video time sequence is recovered, and carrying out frame synchronization on the two paths of MIPI video signals; and S3, based on a video time sequence required by a screen, clock domain synchronization is performed on the two paths of MIPI video signals, and the two paths of MIPI video signals after clock domain synchronization are read out and subjected to video stitching in sequence according to a stitching sequence, so that data receiving and video stitching are realized, and meanwhile, the power consumption is low, the cost is low, and miniaturization is facilitated.

The preparation method specifically comprises the following steps: (1) first-step material feeding: adding isophthalic acid, propylene glycol, ethylene glycol and diethylene glycol into a reaction kettle, starting stirring and heating, after the materials are molten, gradually heating and reacting, taking reactants and measuring the acid value, and then adding a catalyst and a catalyst into the reaction kettle; when the measured acid value meets the condition, cooling to obtain primary ester; (2) second-step feeding: adding epoxy resin, PCDL, adipic acid, maleic anhydride and methylpropanediol into the primary ester obtained in the step (1), continuously heating and reacting, measuring the acid value of a reactant after the reaction is completed, and respectively vacuumizing and cooling when the measured acid value meets the condition; and (3) adding a polymerization inhibitor, continuously carrying out cooling reaction, mixing the reactant in the reaction kettle with an active monomer, controlling the temperature, stirring, cooling, and discharging. The invention has the advantages that the compatibility of the system is improved, and the light transmittance of the cured resin is improved on the premise of not influencing the mechanical properties.

The invention provides a heat sink process and a heat sink assembly, and the process comprises the following steps: S1, carrying out the punching of an AlN-SiC ceramic substrate, obtaining an AlN-SiC ceramic substrate with a blind hole, and filling the blind hole with metal slurry, and obtaining a composite substrate; s2, TiAlN layers are deposited on the two sides of the composite substrate in situ respectively, and a composite substrate is obtained; s3, the side, provided with the blind holes, of the composite substrate is coated with a photoresist layer and patterned, and then a Cu layer, an Ag layer and a graphene / nano-silver composite layer are sequentially electroplated; one side, without the blind holes, of the composite substrate is coated with a heat dissipation insulating layer, and an electroplated plate is obtained; and S4, stripping the photoresist of the electroplating plate to obtain the heat sink assembly. The heat sink assembly obtained by the invention is conductive on one side and insulated on the other side, and has the advantages of good heat dissipation performance and conductivity.

The invention discloses silanized hyaluronic acid as well as a synthesis method and application thereof, and belongs to the technical field of biological material synthesis. The synthesis method of the silanized hyaluronic acid comprises the following steps: dissolving hyaluronic acid in a bio-based solvent to form a hyaluronic acid solution; mixing the hyaluronic acid solution with an amino-containing silane coupling agent, and carrying out a first reaction to form an intermediate reactant; mixing the intermediate reactant with a catalyst, and carrying out a second reaction to form silanized hyaluronic acid; the bio-based solvent is glycerol and / or hexafluorophosphate ionic liquid; the catalyst is an ionic liquid loaded metal oxide. The invention provides the environment-friendly and efficient synthesis method of the silanized hyaluronic acid, and the synthesized silanized hyaluronic acid has higher silicon content, is a water-soluble macromolecule and can meet the application requirements of the silanized hyaluronic acid in cosmetics, health care products and medical auxiliary materials.

The invention discloses a flash evaporation polyolefin conductive film as well as a preparation method and application thereof, and relates to the technical field of flash evaporation breathable films. The preparation method comprises the following steps: calcining a carbon nanotube, modifying with hexadecyl trimethyl ammonium bromide, preparing conductive master batches from the polymer melt A, a coupling agent and the modified carbon nanotube, and preparing the thin film from a spinning solution containing the polymer melt B, the conductive master batches and a spinning solvent through flash spinning equipment. According to the preparation method, the carbon nanotubes can efficiently adsorb hexadecyl trimethyl ammonium bromide to form a molecular wrapping layer, so that uniform dispersion of the carbon nanotubes in a spinning solution is promoted, the conductivity uniformity of the prepared thin film is guaranteed, the carbon nanotubes are of a curled round tube morphology structure, the porosity of the thin film is improved due to dispersion of the carbon nanotubes in the thin film, and the conductivity of the thin film is improved. The air permeability of the film can be highly maintained, and the prepared film is high in conductivity and hydrophobicity, can replace carbon paper to prepare a film electrode gas diffusion layer, and is low in cost.

The utility model relates to a 45-degree oval thoracic cavity curettage spoon, which belongs to the technical field of medical supplies. The utility model discloses handle and harrow hook are connected as an organic whole, the harrow hook includes the harrow hook main part and the spatula who are connected, the spatula is arranged at the front end of the harrow hook main part, the handle is arranged at the rear end of the harrow hook main part, and the spatula adopts oval long groove type design. The utility model has simple and reasonable structure design, is safe and reliable, convenient to operate, can be applied to single-hole and multi-hole thoracoscope, and satisfies the use demand.

The utility model relates to a metal ring antenna structure suitable for wearable equipment, which comprises a PCB mainboard, a metal ring is arranged on the outer ring of the PCB mainboard, a clearance groove with a certain width is reserved between the metal ring and the PCB mainboard, an antenna feed end and an antenna grounding pin are arranged on the metal ring, a first metal elastic sheet and a second metal elastic sheet are arranged on the PCB mainboard, and the first metal elastic sheet and the second metal elastic sheet are arranged on the PCB mainboard. A leading-out pin of an antenna feed end on the metal ring is connected into the PCB mainboard by being connected with a first metal elastic piece, an antenna grounding pin on the metal ring is connected with a second metal elastic piece, and the second metal elastic piece is connected with a single-pole four-throw switch chip on the PCB mainboard through a corresponding circuit and used for switching of different states of the antenna. The working frequency band of the antenna is expanded, and the performance is improved. The antenna provided by the utility model is simple in structure and small in size, and can be very suitably applied to wearable equipment to realize a voice communication function, and the return loss and efficiency parameters of the antenna completely meet the application requirements of the wearable equipment.

The invention provides an unmanned aerial vehicle routing inspection method and system based on semantic guidance and an asset value cost graph, and the method comprises the steps: reasoning a possible distribution region of a target when the target is not directly observed through analyzing the structure law of semantic information, such as an equipment number, a function partition identifier and the like, in a transformer substation; generating a confidence map to guide the unmanned aerial vehicle to efficiently inspect; constructing a semantic cost graph fusing the static asset value and the dynamic operation risk, and quantifying potential loss of different regions when collision or falling occurs; according to the real-time health state of the unmanned aerial vehicle, semantic guidance is emphasized during normal inspection through a dual-guidance function fusion and switching mechanism, and the unmanned aerial vehicle is automatically switched to asset value cost minimization guidance in an abnormal or emergency state to realize safe disposal; the system adopts a framework of semantic reasoning, cost evaluation and flight control module decoupling, and guidance intelligence and control reliability are ensured. According to the invention, the inspection blindness of the unmanned aerial vehicle is obviously reduced, and the abnormality handling risk is reduced.

The invention relates to a light-transmitting cement-based material preparation device and a method for using the same, and belongs to the technical field of light-transmitting cement-based material production equipment, comprising: a bracket; a placement frame, which is vertically arranged on one side of the bracket and suspended in the air, and the placement frame is connected to the bracket; a wire-laying component, which is arranged just above the placement frame and is used to fix optical fibers; a plurality of frame plates, which are horizontally stacked inside the placement frame; a fixing component, which is arranged inside the placement frame and is used to fix the frame plates; a cutting component, which is arranged below the placement frame and is used to cut the optical fibers in a horizontal direction; the invention ensures the standardization of frame construction through the gravity of the frame plates and the optical fibers themselves, and the electric heating riveting plate can not only cut the optical fibers but also form a connection anchor point between the optical fibers and the frame plates, so as to prevent the displacement of the optical fibers during the pouring process and improve the quality of preparing light-transmitting cement-based materials. The invention is simple to operate, easy to use, highly practical, and worthy of promotion.

The invention provides an environment-friendly high polymer material additive as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials, the preparation method comprises the following steps: dissolving beta-cyclodextrin into an anhydrous solvent, adding methacryloyl chloride, controlling the molar ratio of methacryloyl chloride to beta-cyclodextrin to be 1: 1, carrying out substitution reaction, then adding excessive acetic anhydride, and carrying out heat preservation reaction to obtain the environment-friendly high polymer material additive. Carrying out acetylation reaction, and purifying to obtain modified beta-cyclodextrin; adding glycidyl methacrylate, ethylene and modified beta-cyclodextrin into a reaction kettle, and carrying out high-pressure free radical polymerization in the presence of an initiator and a chain transfer agent to obtain the environment-friendly high polymer material additive, wherein the mass ratio of the glycidyl methacrylate to the ethylene to the modified beta-cyclodextrin is (4-8): (88-94): (2-4). According to the prepared additive, the processing rheological property and mechanical toughness of a PCR material are improved, meanwhile, the release characteristic of low-volatility organic compounds is considered, and the application requirements of the fields of automobile interiors and high-end packaging are easily met.

The invention belongs to the technical field of fuel cells, and particularly relates to a metal bipolar plate protective coating as well as a preparation method and application thereof. The zirconium or zirconium alloy bonding layer provided by the invention and the metal bipolar plate can form a strong bonding interface, and the interface is subjected to chemical reaction in the working environment of the fuel cell to form zirconium oxide, so that the self-corrosion potential of the coating is improved, and the coating is endowed with excellent corrosion resistance. Besides, zirconium or zirconium alloy is used as the bonding layer, so that the surface roughness of the protective coating can be reduced, the actual contact area of the protective coating is larger, and the electric contact performance is better. The protective coating interface of the metal bipolar plate provided by the invention has high binding force and excellent chemical inertness, the coating contains a CrN and Cr2N two-phase structure, the corrosion resistance of CrN is exerted, the conductivity is enhanced through the Cr2N phase, and high-reliability and long-life protection is provided for the metal bipolar plate of the fuel cell.

This invention discloses a method for preparing high oil-resistant nitrile rubber. Based on 100 parts by weight of butadiene and acrylonitrile, the mixture includes 275 parts soft water, 50-55 parts butadiene, and 45-50 parts acrylonitrile. The emulsifier is a composite system of dodecylbenzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt, with an emulsifier dosage of 2.5-5 parts. The initiator is a persulfate, with a dosage of 0.1-0.5 parts. Triethanolamine is 0.1 parts. A nitrile rubber paste is synthesized via a thermal polymerization process using a batch feeding method with the addition of a molecular weight regulator. A terminator and antioxidant are added, and the paste is then degassed, coagulated, washed, and dried to obtain a high-strength nitrile rubber product. This nitrile rubber exhibits a Mooney viscosity (ML). (1+4) 100℃ With a strength of 90-120, tensile strength ≥27.5MPa, and elongation at break ≥450%, it can meet the application requirements of automobiles, aerospace, gaskets and other fields.

The invention relates to a method for detecting the effective concentration of a water-based cutting fluid, which comprises the following steps: testing the limit antirust concentration of a cutting fluid stock solution and recording as Clim, testing the limit dilution multiple of the cutting fluid in use and recording as N, and determining that the effective concentration C of the cutting fluid is equal to N * Clim. The method for detecting the effective concentration of the cutting fluid, provided by the invention, aims at the antirust water-based cutting fluid, is not influenced by factors such as foreign impurities or miscellaneous oil and non-uniform consumption of all components in the use process of the cutting fluid on the basis of the key performance antirust property of the cutting fluid, and can obtain a more reliable effective concentration value; and the practical application requirements are better met.

The present invention relates to the technical field of electronic ceramic substrate materials, and more specifically, to a tape casting slurry, a green porcelain tape and a preparation method thereof. The tape casting slurry of the present invention is made of component A, component B and component C, wherein component A comprises: calcium borosilicate glass powder; component B comprises: solvent, binder, plasticizer and dispersant; component C comprises: one or more of acrylic adhesive, alkane mixture, pre-dispersant and auxiliary agent; the mass ratio of component A, component B and component C is 100:(50-150):(0.02-20). The tape casting slurry provided by the present invention has moderate viscosity and good fluidity, and can obtain a green porcelain tape with uniform film thickness and smooth surface.