156results about How to "Improve high temperature stability" patented technology

The application discloses a modified asphalt for water-based drilling fluid and a preparation method thereof. The modified asphalt for water-based drilling fluid comprises the following raw material components: pretreated reducing slag, acid anhydride modifier, initiator, stabilizer, modifier, modification aid and performance regulator. The modifier is low-grade sulfur. The pretreated reducing slag comprises the following raw material components in weight: inferior reducing slag: 100 parts; oil sand asphalt: 20-60 parts; and pretreatment agent: 0.1-2 parts. The high-softening-point asphalt with high softening point and good hydrophilicity is obtained by modifying the difficult-to-handle inferior reducing slag and oil sand asphalt, and is suitable for being used as main material for producing asphalt water-based drilling fluid.

The application provides an auxiliary agent for enhancing the compatibility of bactericidal corrosion inhibitor, a bactericidal corrosion inhibitor and application thereof. The auxiliary agent comprises ionic liquid and alcohol compound in a mass ratio of 1-10:1-5; the ionic liquid comprises one or a combination of imidazole ionic liquid, pyridine ionic liquid, quinoline ionic liquid, quaternary ammonium salt ionic liquid and quaternary phosphonium salt ionic liquid. The bactericidal corrosion inhibitor comprises 2-15% of the auxiliary agent for enhancing the compatibility of bactericidal corrosion inhibitor, 10-30% of benzyl quaternary ammonium salt, 5-30% of guanidine compound and / or glutaraldehyde, and the balance of water, based on 100% of the total mass of the bactericidal corrosion inhibitor. The application also provides application of the bactericidal corrosion inhibitor to corrosion protection in an unconventional gas production system. The auxiliary agent provided by the application can enhance the compatibility of the bactericidal corrosion inhibitor with flowback fluid. The bactericidal corrosion inhibitor has the advantages of good high-temperature stability, no foaming, high bactericidal and corrosion inhibition efficiency, etc.

The invention discloses a novel nano-coating cast steel brick and a preparation method thereof. The cast steel brick comprises a cylindrical refractory matrix, a double-layer nano coating and a modified metal reinforcing belt, wherein the double-layer nano coating comprises a nano aluminum oxide bottom layer and a functional layer containing a sol-gel pre-coated graphene-ceramic composite material. According to the preparation method, pulse vibration forming, a sol-gel pre-coating technology and a carbon thermal reduction protective atmosphere sintering technology are adopted, the graphene-ceramic composite material has an Al2O3-BN double-layer ceramic coating layer protection structure, and the structural stability of graphene at the high temperature is ensured. The technical problems of low refractoriness, poor corrosion resistance and short service life of a traditional cast steel brick are solved, the refractoriness is improved by about 6%, the corrosion resistance is improved by 78%, the thermal shock stability is improved by about 79%, the single use performance is improved by 250%, and the cast steel brick is suitable for molten steel flow control in a continuous steel casting process.

The invention relates to a positive electrode active material and a preparation method thereof, a positive electrode and a lithium ion battery. The positive electrode active material comprises lithium manganate particles and a sodium phytate layer coating the surfaces of the lithium manganate particles. According to the technical scheme, in the positive electrode active material, the sodium phytate layer serves as a coating layer, and six phosphate groups in molecules of the sodium phytate layer and manganese ions dissolved out of lithium manganate particles can form a stable complex, so that the dissolved-out manganese ions are efficiently captured and prevented from being further migrated into an electrolyte to damage the performance of a battery; meanwhile, the sodium phytate layer forms a layer of compact physical barrier on the surfaces of the lithium manganate particles, so that direct contact between the lithium manganate particles and an electrolyte can be effectively blocked, and dissolution of manganese ions is inhibited from the source. Through a synergistic effect of a chelation effect and a physical barrier effect of the sodium phytate layer, the dissolution amount of manganese ions can be remarkably reduced, and the crystal structure of lithium manganate particles is prevented from being distorted, so that the structural stability of the positive electrode active material is improved.

This invention proposes a graphene film-based photoconductive semiconductor switch and its application method. It includes a substrate, a graphene film layer, a semiconductor layer, a first electrode, a second electrode, and a light incident window. The substrate is an insulating, high-temperature resistant substrate with the semiconductor layer fixedly attached to its top surface. The graphene film layer covers the top surface of the semiconductor layer, forming an ohmic contact between the graphene film layer and the semiconductor layer. This invention utilizes the excellent conductivity of graphene to form an ohmic contact between the graphene film layer and the semiconductor layer, effectively reducing the switch's on-resistance and improving its conduction efficiency. Simultaneously, the ultra-thin structure of the graphene film layer enhances laser absorption efficiency, improves the switch's laser trigger sensitivity, and shortens the response time. The substrate is made of insulating, high-temperature resistant alumina ceramic material, which improves the switch's high-temperature stability and insulation performance, extending its service life. The overall structure is simple, cost-controllable, and highly practical, showing significant improvements in response speed, conduction performance, and stability.

The application discloses a transverse stepped gap groove clamp for a classical four-point bending experiment, which comprises an upper clamp, a lower clamp and a positioning connecting piece, standard installation through holes are arranged on the upper clamp, the lower clamp and an experimental sample, the positioning connecting piece passes through the standard installation through holes to realize the connection of the upper clamp, the experimental sample and the lower clamp, stepped gap groove arrays are arranged on working surfaces of the upper clamp and the lower clamp in contact with the experimental sample, the stepped gap groove array comprises a plurality of grooves arranged along the length direction of the upper clamp and the lower clamp, the depth of the groove is arranged along the height direction of the upper clamp and the lower clamp, the depth of the groove is increased or decreased along the length direction of the experimental sample according to a preset gradient, and the height of the groove is arranged along the thickness direction of the upper clamp and the lower clamp. The application can meet the requirement that the four-point bending experiment cannot realize high-throughput gap simulation in a stress corrosion environment, and is used for improving the accuracy, reliability and efficiency of the experiment.

This invention discloses a single-component moisture-curing conductive and thermally conductive adhesive and its preparation process, comprising the following raw materials in parts by weight: 100 parts SMP adhesive; 15-30 parts flake silver powder; 500-900 parts spherical silver-coated copper powder; 0-400 parts dendritic silver-coated copper powder; 10-20 parts decamethyltetrasiloxane; 1-1.5 parts β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester; 7.5-10 parts N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane; and 1-1.5 parts vinyltrimethoxysilane. This invention allows the adhesive to cure at room temperature / low temperature using moisture in the air, eliminating the need for temperatures above 120°C. This completely avoids thermal stress damage to heat-sensitive substrates such as plastics, flexible circuit boards, and PET / PI films, making it perfectly suited for low-temperature processing scenarios such as flexible electronics manufacturing, wearable devices, and flexible sensors.

The application discloses a MAX phase reinforced three-dimensional network tin-based lead-free solder and a preparation method thereof, and belongs to the technical field of lead-free solder. The MAX phase reinforced three-dimensional network tin-based lead-free solder is characterized in that the MAX phase reinforcing phase is distributed in the form of a three-dimensional continuous network skeleton at the grain boundary of a tin-based lead-free solder matrix; and the MAX phase reinforcing phase forms a continuous network penetrating through the whole tin-based lead-free solder matrix. The application also discloses an application of the MAX phase reinforced three-dimensional network tin-based lead-free solder in a high-temperature, high-load and high-frequency vibration scene. Through process innovation and performance optimization, the application aims to finally prepare a "high-strength, high-plasticity and high-temperature stability" tin-based three-dimensional network composite solder, solves the problem that a traditional tin-based single-component lead-free solder is prone to deformation and cracking due to thermal stress and mechanical load, improves the reliability of electronic packaging, and expands the application range of the tin-based lead-free solder in high-demand fields.

This application discloses an electrolyte solute, its preparation method, and its application. The electrolyte solute comprises an olefinic cyclohexene carboxylic acid compound obtained by the reaction of conjugated diene carboxylic acids. The conjugated diene carboxylic acid includes at least one compound having the structure shown in Formula III: wherein X and Y are each independently selected from H, -RO-COOH, substituted or unsubstituted C1-10 saturated hydrocarbon groups, etc., and at least one of X and Y is -RO-COOH; RO represents a directly bonded or C1-10 saturated hydrocarbon group. The electrolyte solute of this application, comprising an olefinic cyclohexene carboxylic acid compound with unsaturated hydrocarbon functional groups, can both improve the flash voltage of the electrolyte and maintain low viscosity and high conductivity.

The invention provides a CMAS corrosion resistant material with stable phase, the CMAS corrosion resistant material is solid solution ceramic, the molecular formula of the solid solution ceramic is (Zr1-x-yHfx) TayO2 + 0.5 y, x is greater than 0.4 and greater than 0.1, and y is greater than 0.4 and greater than 0.1. By doping the elements Hf and Ta, the high-temperature phase change of ZrO2 is inhibited, the high-temperature stability of (Zr1-x-yHfx) TayO2 + 0.5 y is enhanced, and meanwhile, the melting point and CMAS corrosion resistance of the material are improved. Meanwhile, the invention also provides a preparation method of the material.

The invention discloses a sulfur-tolerant platinum-based catalyst and a preparation method thereof, and the preparation method of the sulfur-tolerant platinum-based catalyst comprises the following steps: weighing roasted ZrO2 as a carrier, weighing ammonium metatungstate, completely dissolving in deionized water, dropwise adding the solution until the carrier is completely immersed, and carrying out ultrasonic treatment; standing at room temperature, drying, and roasting in air at 500-600 DEG C to prepare a tungsten oxide loaded solid acid composite carrier WO3-ZrO2; and weighing chloroplatinic acid, completely dissolving the chloroplatinic acid in deionized water, dropwise adding the solution into the composite carrier, completely immersing the composite carrier, carrying out ultrasonic treatment, standing at room temperature, drying, and roasting in air at 250-350 DEG C to obtain the sulfur-tolerant platinum-based catalyst. The catalyst is simple in preparation method, has relatively strong tolerance to different sulfur species, and has good low-temperature catalytic performance and catalytic stability to low-carbon alkane.

The invention belongs to the technical field of electrode paste preparation, and particularly relates to an efficient and environment-friendly electrode paste production process. A composite binder and a corncob powder-lignin composite carbonized precursor are prepared, hexamethylenetetramine-melamine resin is used as a composite cross-linking agent, the rigidity and thermal stability of boron modified phenolic resin in the composite binder are enhanced through a B-O bond, a phenolic hydroxyl group of the boron modified phenolic resin and plant pitch form a hydrogen bond, and the plant pitch is subjected to heat preservation and heat preservation. A hydrogen bond-covalent bond cross-linked network is formed under the action of the cross-linking agent, so that the high-temperature structure stability is guaranteed; the corncob powder fixes lignin through a porous framework, multistage pore channels are formed after carbonization, interface gaps are filled, the lignin is pyrolyzed at a high temperature to generate a carbon nano-whisker reinforced framework, thermal stress can be dispersed, interface bonding can be enhanced, and therefore the compactness and high-temperature stability of the electrode paste are improved. In addition, the bio-based composite binder is adopted to replace traditional petroleum-based asphalt, so that the emission of harmful substances is reduced from the source, and the environmental protection benefit and the high performance of the product are both considered.

The application discloses a high-temperature curing ablation-resistant and heat-insulating two-component coating and a preparation process. The coating is composed of A component and B component. The A component comprises modified epoxy resin, liquid butyronitrile rubber, aluminum hydroxide powder, chromium trioxide, high-silica fiber powder, hollow glass microbead and toluene; the B component is a curing agent and a curing accelerator. In the preparation, the aluminum hydroxide powder, the chromium trioxide, the high-silica fiber powder and the hollow glass microbead are made into a filler dispersion liquid; then the epoxy resin and the liquid butyronitrile rubber are made into a resin-rubber mixture; then the filler dispersion liquid is slowly and uniformly added into the resin-rubber mixture under stirring, and the A component is obtained by soaking in a static magnetic field at room temperature and grinding; the curing agent and the curing accelerator are the B component. By optimizing the coating composition, the ablation resistance and the heat-insulating performance of the coating can be obviously improved by coating a single layer, the construction process is simplified, the coating thickness is reduced, and the high-temperature resistance of the coating is improved.

The application discloses a preparation process of a high-performance Cu-Ni-Fe alloy based on first-principle calculation design, and relates to the technical field of alloy material preparation. The process constructs a precise Cu-Ni-Fe ternary alloy thermodynamic database by combining a first principle with a CALPHAD method, determines a composition range based on database calculation of a multivariate phase diagram, optimizes the composition by calculating a work function, an elastic constant and a thermal expansion coefficient through a first principle, and obtains a finished product through smelting, heat treatment and forming processing. The final alloy has an atomic percentage composition of Cu 30%-75%, Ni 10%-30% and Fe 10%-30%, a tensile strength of greater than or equal to 816.4 MPa, a total elongation at break of greater than or equal to 34.27%, and a thermal expansion coefficient of less than 20*10 ‑6 / K, and has excellent mechanical properties and thermal stability, thereby solving the problems of blind composition design and large performance fluctuation of a traditional process and being suitable for multiple fields such as ocean engineering and electronic packaging.

The application discloses a kind of high-performance outdoor full package imitation wood composite board and preparation method thereof, relate to polyurethane composite board technical field, the full package imitation wood composite board includes base board, and the polyurethane material of setting in the lower surface and the four around of base board, and the resin material of setting in upper surface.Its preparation method includes the following steps: pouring polyurethane material in the silica gel mould after surface treatment, place base board, mould pressing, make the polyurethane material with wood texture around and lower surface of base board composite, obtain intermediate product A;Resin material is rolled on the upper surface of intermediate product A, and is dried, to obtain full package imitation wood composite board;The silica gel mould after surface treatment is prepared by transferring real solid wood board texture.

The application belongs to the technical field of modified asphalt materials, and particularly relates to high-viscosity and high-elasticity modified asphalt for ultra-thin surface and a preparation method thereof. The high-viscosity and high-elasticity modified asphalt comprises the following components in parts by weight: 100 parts of base asphalt, 7-15 parts of SBS thermoplastic elastomer, 2-4 parts of tackifier, 4-8 parts of plasticizer, 3-6 parts of polyolefin elastomer grafted glycidyl methacrylate, and 1-2 parts of diaryl disulfide. The polyolefin elastomer grafted glycidyl methacrylate, the specific tackifier and the plasticizer are used to synergistically modify the SBS modified asphalt, so that the anti-segregation performance, low-temperature crack resistance, high-temperature stable anti-rutting capability and anti-aging property of the obtained modified asphalt can be simultaneously improved.

This invention focuses on the application of a PtZn / Al2O3 bimetallic catalyst in the propane dehydrogenation reaction. A uniquely structured mixed oxide support was synthesized through a co-precipitation strategy incorporating an appropriate amount of silicon (Si), and metallic Pt was loaded using an equal-volume impregnation method. Benefiting from the uniform dispersion of Zn, Pt is atomically dispersed on the surface of Zn nanoclusters, improving metal utilization and catalytic efficiency. The introduction of Si significantly optimizes the metal-support interaction, greatly enhancing the catalyst's activity and stability. With catalyst particles of 20-40 mesh, it exhibits excellent catalytic performance, along with good high-temperature stability and resistance to carbon deposition. This preparation process is simple, reproducible, and achieves efficient and highly selective propylene production with low amounts of precious metals, demonstrating promising industrial application prospects.

This invention discloses a laser-shock-assisted creep aging forming method for thin-walled components with complex curvature. The method includes: simulating and obtaining difficult-to-form regions; performing laser shock on the difficult-to-form regions of a large-size aluminum alloy thin-walled component sheet; wrapping and fixing a breathable felt around the impacted component; placing the component in a sealed space formed between a vacuum bag and the mold surface; evacuating the sealed space; and then sending the mold into an autoclave for creep aging. After completion, the component springs back, yielding the target surface. This method uses a laser to impact localized areas of a large-size aluminum alloy thin-walled component, introducing dislocations while achieving pre-forming. This provides a good surface foundation for subsequent high-precision creep aging forming of the component, and is suitable for forming parts with complex curvature.

The application discloses a kind of anti-fake color-changing ink and printing process for flat paper to print two-dimensional code, belong to the technical field of ink for anti-fake.The anti-fake color-changing ink according to weight fraction, including: acrylic emulsion 35-40 parts, polyurethane emulsion 15-20 parts, bisphenol A type epoxy resin 5-8 parts, thermochromic material 6-10 parts, hydrogel coated thermochromic material 2-5 parts, temperature-sensitive color-changing capsule 5-8 parts, scratch-resistant additive 2-3 parts, first coupling agent 1-2 parts, second coupling agent 1-2 parts, leveling agent 0.5-0.8 parts, defoaming agent 0.3-0.5 parts, stabilizer 0.5-0.8 parts, first crosslinking agent 2-3 parts, methylsilane 1-2 parts, wax emulsion 1-2 parts, wetting agent 2-3 parts, preservative 0.1-0.5 parts and deionized water 15-20 parts;The hydrogel coated thermochromic material is acrylamide-based hydrogel coated thermochromic material.The anti-fake color-changing ink can simultaneously realize the promotion of anti-precipitation, high adhesion, scratch resistance, high-temperature aging resistance by the synergy of hydrogel coated thermochromic material and scratch-resistant additive.

This invention discloses a method for preparing high-entropy ceramic matrix composites using a reactive infiltration process, belonging to the technical field of ceramic matrix composites. The steps are as follows: at least four single-component carbides are ball-milled and mixed with a carbon source, then dispersed in a dispersion liquid to obtain a slurry; continuous fibers are woven into a preform, and an interface layer and a matrix layer are deposited to obtain a semi-dense composite material; the slurry is introduced through vacuum or pressure impregnation; and a high-entropy carbide matrix is ​​generated in situ and densified by reactive infiltration after embedding with a transition metal and its alloy. This invention solves the problems of long process cycles, high porosity, high cost, and insufficient introduction of high-entropy ceramics in existing processes, achieving rapid densification and improving the material's high-temperature stability, oxidation resistance, and ablation resistance. It is suitable for the large-scale production of thermal protection materials for hypersonic vehicles.

The present application relates to the technical field of lithium battery production, and particularly relates to a high-energy-efficiency carbon kiln and a preparation method thereof. The high-energy-efficiency carbon kiln is prepared from carbon coarse aggregate, carbon fine aggregate, carbon fine powder, a conditioning additive and a water-soluble binding agent through high-temperature carbonization. The microstructure controllable crucible matrix is prepared by using different particle gradations, the carbon kiln blank strength is improved by using modified resin and industrial syrup as the composite binding agent, the damage rate is reduced, a three-dimensional network structure is formed in the interior of the kiln during the baking process to coat the aggregate, fill the pores and enhance the corrosion resistance of the carbon kiln. The modified resin has good affinity with the conditioning agent on the carbon chain, and the Fe2AlB2 fiber with excellent damage tolerance is generated in-situ while the zirconium boride, aluminum powder, iron powder and boron gangue are enriched. The coupling effect of the modified resin skeleton and the Fe2AlB2 whisker further improves the toughness and thermal shock stability of the product, and increases the service life.

The invention discloses a high-temperature-resistant thermal response type retarder which is prepared by the following steps: firstly, polymerizing 3.5 to 5.5 parts of acryloyl glycinamide, 0.05 to 0.1 part of bisacrylamide monomer and 0.5 to 2.5 parts of acrylic acid monomer, and then polymerizing with 28 to 32 parts of 2-acrylamido-2-methylpropanesulfonic acid, 7 to 9 parts of acrylic acid monomer and 3 to 7 parts of acrylamide monomer. The invention also discloses a preparation method thereof. The high-temperature-resistant thermal response type retarder provided by the invention has relatively good high-temperature stability; carboxylate ions can be released in a high-temperature environment, so that delayed coagulation in the high-temperature environment is realized; and when the temperature is reduced, the released carboxylate ions are recycled, so that the strength of the set cement is rapidly developed in a medium-temperature environment.

This invention relates to the field of laser cladding technology, specifically to a toughened and reinforced laser cladding alloy powder and its preparation process. It solves the problem of poor hardness and toughness of the cladding layer formed by existing laser cladding alloy powders during use. This laser cladding alloy powder incorporates scandium / erbium-loaded nano-silica and tannic acid-hydroxypropyl cellulose-coated boron nitride. Loading scandium and erbium onto the nano-silica improves the wear resistance and tensile strength of the cladding layer. Coating the boron nitride surface with tannic acid-hydroxypropyl cellulose powder improves the wettability between boron nitride and the metal matrix, reducing interface defects. The synergistic effect of rare earth elements and boron nitride reduces porosity and cracks in the cladding layer. It also improves density by refining grains and strengthening interfacial bonding, further enhancing the material's wear resistance and tensile strength, ensuring service life and reliability under high temperature and high stress environments.

This invention discloses an industrial production method for cement clinker that co-processes heavy metal-containing waste, comprising: raw meal preparation: raw meal is prepared according to the following proportions by weight: 84-87 wt% calcareous raw materials, 6.0-7.2 wt% clayey raw materials, 4.8-5.8 wt% corrective raw materials, and 2.0-4.5 wt% heavy metal-containing waste; addition of composite synergist: a heavy metal adsorption-mineralization composite synergist is added to the raw meal; pre-decomposition: the homogenized raw meal is preheated by a multi-stage cyclone preheater and then enters a decomposition furnace for carbonate decomposition; clinker calcination: the decomposed raw meal enters a rotary kiln and is calcined at 1350-1450℃ to form clinker; and rapid cooling of clinker: the calcined clinker is rapidly cooled to room temperature by a grate cooler to obtain finished cement clinker. This invention can achieve a total solidification rate of heavy metals in clinker of 93%, and increase the retention of Pb, Cd and Zn by 13.9 times, 59.1% and 11.5% respectively, and increase the 28-day compressive strength to 61.8 MPa.

The application discloses a high-silica glass fiber heat insulation cotton for automobiles and a preparation method thereof, and relates to the technical field of sound and heat insulation. The high-silica glass fiber is used as raw material, and the high-silica glass fiber has higher high-temperature resistance and high-temperature stability than conventional glass fibers, can maintain high mechanical strength for a long time, and avoids softening under high temperature. The phenolic resin is modified, a boron-silicon modified polyphenol monomer containing phenolic hydroxyl groups and boron and silicon elements is prepared, and participates in the condensation reaction of the phenolic resin, so that the phenolic resin has higher high-temperature resistance and flame retardance, and the glass fiber heat insulation cotton has higher safety performance.

The invention belongs to the technical field of road and bridge paving materials, and discloses an anti-rutting epoxy asphalt toughening additive. The formula comprises the following components in parts by weight: 40 parts of solid epoxy resin, 35 parts of a latent polyester curing agent, 5 parts of an ultra-high molecular weight epoxy toughening agent, 20 parts of a water damage resistant improver, 100 parts of hard asphalt particles, 2 parts of an antioxidant, 5.5 parts of a silane coupling agent, 6 parts of nano silicon dioxide, 0.1 part of a curing accelerator, 0.5 part of a light stabilizer and 1 part of a lubricating separant. In the formula, solid epoxy reacts with a latent polyester curing agent to form a three-dimensional rigid structure, and the three-dimensional rigid structure is matched with oxidized asphalt particles and nano silicon dioxide, so that the high-temperature stability and the pressure resistance are remarkably improved, and ruts are inhibited from the source; the ultra-high molecular weight epoxy flexibilizer can prolong the molecular chain segment of a cross-linking point, and is combined with the curing accelerator to regulate and control the reaction rate, so that the low-temperature crack resistance and fatigue resistance are enhanced while the strength is ensured.

The invention discloses a high-temperature fire-resistant heat-insulation carbon fiber composite material which comprises the following components in parts by weight: 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified short carbon fibers, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate. The preparation method comprises the following steps: S1, weighing the wollastonite-feldspar composite powder, the modified porous mullite aggregate, the calcium aluminate cement and the modified short carbon fibers in proportion, and carrying out dry mixing; s2, adding water into sodium dodecyl benzene sulfonate and sodium tripolyphosphate, and stirring to obtain an auxiliary agent aqueous solution; s3, adding the auxiliary agent aqueous solution into the dry powder mixture, and stirring; s4, transferring the slurry into a mold for hydraulic forming; s5, the formed blank is subjected to curing, demolding, drying, high-temperature sintering and cooling, and the high-temperature fire-resistant heat-insulation carbon fiber composite material is obtained. The fire-resistant and heat-insulating carbon fiber composite material produced by the invention can improve the high temperature resistance and compression strength.

The invention belongs to the technical field of oil field chemicals, and provides a polyether modified polysiloxane composite defoaming agent in the petroleum industry and a preparation method thereof.The polyether modified polysiloxane composite defoaming agent in the petroleum industry comprises lipophilic polyether modified polysiloxane (LP-PMPS), an organic silicon defoaming active component, a platinum catalyst and optional hydrophobic silicon dioxide; lipophilic polyether modified polysiloxane is used as a compatilizer and a stabilizer, a polysiloxane main chain of the lipophilic polyether modified polysiloxane is compatible with an organic silicon defoaming active component, a polyether side chain with high PO content is anchored in mineral oil, and a chemical bonding and physical compounding combined composite network active phase is formed through a one-step in-situ reaction. Dispersing in a mineral oil continuous phase to form a uniform and stable system; the defoaming agent provided by the invention meets the Q / SY17001 and Q / SY16859 standards, has the advantages of rapid defoaming, lasting foam inhibition, excellent stability and wide system adaptability, is suitable for the whole process of drilling, extraction, refining and the like in the petroleum industry, and is simple and convenient in preparation process and easy for industrial production.

The application discloses a long-time high-temperature-resistant lead sulfide colloidal quantum dot film and a preparation method thereof, and comprises the following steps: obtaining first PbS quantum dot solids, wherein the surface ligand of the first PbS quantum dot solids is a first ligand; dissolving the first PbS quantum dot solids in a first non-polar solvent to form a first PbS quantum dot solution; adding a mercaptan ligand into the first PbS quantum dot solution; obtaining second PbS quantum dot solids, wherein the surface of the quantum dots is the mercaptan ligand; dissolving the quantum dots with the mercaptan ligand on the surface in a second non-polar solvent to obtain a second PbS quantum dot solution; and spin-coating the second PbS quantum dot solution on a substrate to prepare a PbS colloidal quantum dot film; and the mercaptan ligand is one or a combination of mercaptoethanol (ME) or butanethiol. According to the application, mercaptoethanol (ME) or butanethiol is used as the PbS quantum dot solid ligand, the high-temperature-resistant mercaptan ligand is used to replace the high-temperature-unstable metal halide ligand, and the long-time high-temperature stability of the PbS quantum dot film is greatly improved.

The present application relates to a kind of cylindrical electrode paste and its preparation method.A kind of cylindrical electrode paste, by mass parts, including 15-20 parts of anthracite main material, 25-40 parts of residual anode, 3-10 parts of graphite fragment, 25-35 parts of coke, 15-30 parts of organic binder, 6-18 parts of bio-based binder. Among them, organic binder includes medium temperature pitch, anthracene oil, beta resin. Among them, bio-based binder includes carbonized hydrophobic composite modified wood bamboo powder, sodium carboxymethyl cellulose. The carbonized hydrophobic composite modified wood bamboo powder of the present application and sodium carboxymethyl cellulose are compounded to form a bio-based binder, which cooperates with the organic binder to ensure the bonding strength, high temperature resistance and electrical conductivity of the cylindrical electrode paste, while realizing the green and low-carbon utilization of biomass, solving the problems of high temperature failure, moisture absorption and easy caking, and many pores of traditional bio-based binder, reducing the resistivity and production cost, and improving the structural density and use stability.