202 results about "Thermal stability" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The application provides a flexible plugging agent for offshore oil and gas drilling fluid and a preparation method and application thereof, and belongs to the technical field of offshore oil and gas drilling and production. The plugging agent is prepared from the following raw materials: styrene, N-phenylmaleimide, 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, 2-methacryloyloxyethylphosphorylcholine, a crosslinking agent, an initiator, a hydrophilic emulsifier, an oleophilic emulsifier and water. The plugging agent has excellent structural stability, heat resistance, salt resistance and hydration stability, has good adaptability to a low-density drilling fluid system, has a flexible deformation capacity, can effectively enter a complex leakage passage to achieve effective plugging, and can maintain the integrity and stability of a plugging layer under drilling fluid circulation shearing, temperature fluctuation and complex downhole conditions, thereby having applicability in a high-temperature and high-pressure drilling environment.

The application discloses a kind of water-based ceramic slurry adhesives for ceramic-coated polyolefin separators, and relates to the technical field of polyolefin separators.The adhesives prepared by the preparation method provided by the application can promote the uniform dispersion of inorganic ceramic particles in the ceramic slurry, and the excellent adhesion of the adhesives can firmly bond the inorganic ceramic particles to the separators, preventing the phenomenon of powder falling during production, transportation and use, thereby ensuring the improvement effect of the thermal stability of the inorganic ceramic particles on the separators.

This invention discloses a covalent organic framework material for selective solid-phase adsorption and separation, its preparation method, and its applications. The material is prepared by polycondensation reaction of electron-deficient triazine rings with short-chain linkers such as hydrazine hydrate, forming a layered structure with a high specific surface area of ​​602 m² / g and a concentrated pore size of 2.0 nm to 3.0 nm. This structure exhibits high adsorption capacity (up to 1.0 mg / g), rapid adsorption kinetics, and excellent selectivity for PAHs in organic solutions through strong π-π interactions and pore confinement effects. The preparation process is simple and the conditions are mild. The material has good thermal stability (>300℃), and its performance retention rate is higher than 92% after 5 cycles. When applied to the solid-phase adsorption of PAHs in petroleum products such as lubricating oil and white oil, it effectively eliminates matrix interference, allowing direct analysis without complex purification steps after adsorption. This overcomes the limitations of traditional materials such as silica gel and activated carbon, which have weak adsorption capacity and require cumbersome post-treatment, providing a new high-performance adsorption material solution for the efficient detection of trace PAHs in petroleum products.

The application belongs to the technical field of bromine flame retardant polymer preparation, and particularly relates to a preparation method of brominated polystyrene, wherein, in the presence of a soluble catalyst, chlorinated bromine is used as a brominating agent to brominate high molecular weight polystyrene; after the reaction is completed, the product is separated from the reaction system through the action of temperature reduction and an additive; the solid is washed and dried to obtain the product; and the mother liquor is recycled for the next bromination reaction. The synthesis method not only realizes the recycling of the solvent and the catalyst, reduces energy consumption and wastewater discharge, but also has high bromine content, good whiteness, high weight average molecular weight and good thermal stability.

This invention provides a highly transparent, low-stress, wide-process-window PETG-modified composite material, composed of the following components: PETG matrix resin, transparent copolyester compatible modified resin, composite thermo-oxidative degradation stabilizer, and transparent core-shell toughening stress modifier. The low-shear granulation process for this composite material includes the following steps: ingredient mixing, low-shear melt extrusion, strip-forming with water cooling, and constant-temperature, low-humidity storage. The low-stress injection molding process for this composite material includes the following steps: drying conditions, screw selection, barrel temperature control, injection control, and mold structure optimization design. Through reasonable formulation ratios, synergistic design, combined with low-shear granulation to reduce material degradation, and optimized injection molding processes, the material's moisture absorption, thermal stability, processing performance, molding performance, and service performance are comprehensively improved, broadening its application scenarios and improving mass production efficiency and part yield.

This invention discloses a high-performance wood-plastic composite frame structure for building doors and windows, belonging to the field of building materials technology. The frame structure includes a wood-plastic outer wall and an internal cavity. A continuous support mesh structure composed of an array of topological units is integrally formed within the cavity. The topological units are configured with a tensile geometry exhibiting a negative Poisson's ratio effect, including multiple load-bearing members and connecting nodes. When the wood-plastic outer wall experiences axial expansion tensile strain due to heat, the topological units compensate for this displacement through node rotation and member bending, thereby significantly reducing interfacial shear stress and suppressing the arching deformation of the frame. When external fasteners are subjected to axial pull-out force, the topological units undergo centripetal contraction deformation, enhancing the frictional gripping force on the fasteners. This invention resolves thermal stress through microscopic geometric reconstruction, effectively addressing the shortcomings of poor thermal stability and insufficient nail-holding power in wood-plastic profiles.

The application discloses a preparation method of isophorone diisocyanate microcapsules for oil well cement self-repairing, and relates to the technical field of external aid type self-repairing materials.The isophorone diisocyanate microcapsules are prepared by using isophorone diisocyanate as core material, using oligomers and crosslinking monomers as shell material raw materials, adopting a solvent evaporation-ultraviolet light synergistic polymerization process, and through low-temperature ultrasonic dispersion, cold water bath premixing and ultraviolet light polymerization under nitrogen protection.The isophorone diisocyanate microcapsules have high yield, high coating rate and dense shell.The method is simple, fast and environmentally friendly, and the prepared isophorone diisocyanate microcapsules have excellent thermal stability, substrate adaptability and self-repairing characteristics, and can realize the rapid self-repairing of oil well cement cracks in a high-temperature, high-pressure and humid environment.

The application discloses a preparation method of high-strength wide-burning-range prestressed magnesia daily-use porcelain and a product prepared by the method. A coating is introduced on the surface of a magnesia daily-use porcelain body through a coating technology, and the difference between the thermal expansion coefficients of different crystal phases is utilized, so that the thermal expansion coefficient of the surface of the body is reduced to generate a pre-compression stress, the effect of enhancing the bending strength of the body is realized, the thermal stability of the ceramic is improved, the demand problem of the magnesia daily-use porcelain for strength and thermal stability is solved, and the application has very important significance for the innovation and development of daily-use ceramic.

This invention relates to the field of thermal stability evaluation technology, and more particularly to a method and apparatus for evaluating the thermal stability of organic heat transfer fluids. The evaluation method includes: placing the organic heat transfer fluid in a loading container, introducing an inert gas to replace the air, sealing the container, and then conducting a high-temperature thermal test; after the high-temperature thermal test, cooling the loading container and then restoring it to atmospheric pressure; after the organic heat transfer fluid returns to room temperature, measuring the indicators of the organic heat transfer fluid, including kinematic viscosity, degradation rate, and pressure; scoring each indicator based on the kinematic viscosity change rate, degradation rate, and pressure increase value; and judging the thermal stability of the organic heat transfer fluid based on the comprehensive score. This invention provides a method and apparatus for evaluating the thermal stability of organic heat transfer fluids, enabling a rapid, efficient, and multi-dimensional evaluation method for the thermal stability of organic heat transfer fluids.

This application discloses a nanocellulose ceramic composite-coated separator, relating to the field of battery separator technology. It includes a porous polymer base membrane and a composite coating, wherein the composite coating covers at least one side of the porous polymer base membrane. The composite coating is obtained by coating and drying an aqueous ceramic slurry, and the aqueous ceramic slurry comprises 85-95 parts by weight of inorganic ceramic particles, 5-15 parts by weight of nanocellulose, 0.1-2 parts by weight of a crosslinking agent, and 200-500 parts by weight of deionized water. This application significantly improves flexibility, adhesion strength, and thermal stability.

The application discloses a high-thermal-stability high-nickel ternary material, a preparation method and application. The application utilizes the characteristic that the high-nickel ternary material is sensitive to water, reconstructs a layer of NiOOH on the surface of the high-nickel ternary material, changes the NiOOH coating layer into various transition metal oxyhydroxides by means of an ion exchange reaction, constructs a layer of phosphide on the surface of the transition metal oxyhydroxide through a phosphorization reaction, finally, decomposes the various transition metal oxyhydroxides into high-entropy oxides by means of high-temperature calcination, and then obtains a high-nickel ternary material coated with double layers; the high-entropy oxides have high thermal stability and lithium ion conductivity. In-situ construction of the high-entropy oxide coating layer can not only improve the thermal stability of the high-nickel material, but also help to improve the rate performance and cycle performance of the high-nickel ternary material. The phosphide has strong conductivity, and in-situ coating of the phosphide on the surface of the high-entropy oxide can form a complementary advantage with the high-entropy oxide, and further improve the rate performance of the high-nickel ternary material.

This application provides a big data-driven smart grid dispatching method and system, comprising: acquiring the sag and deflection morphology during abnormal periods and extracting the conductor heating characteristics during the corresponding periods; inputting the sag and deflection morphology and conductor heating characteristics during abnormal periods into a preset neural network model to predict the eccentric load aggravation level; if the predicted eccentric load aggravation level is higher than a preset load threshold, identifying the time stage of uneven melting of icing and identifying the risk level of airspace safety margin deterioration during the corresponding time stage; determining the dispatching and control of ice-covered lines according to the transmission limit adjustment scheme, assessing whether the dispatching and control of ice-covered lines meets the dispatching and control standards, and determining the final thermal stability transmission limit; obtaining the final thermal stability transmission limit, and using this limit to adjust the transmission power of ice-covered lines in real time to obtain the adjusted operating status.

This invention provides a highly efficient dehydration method for energetic and water-containing waste HTPB propellant, comprising: Step 1, barrier coupling sheet preparation: Under low temperature conditions of 5-10℃, the energetic and water-containing waste HTPB propellant is placed inside a barrier, protected by an inert gas, and pressed into propellant sheets with a thickness ≤1mm using a two-roller press; Step 2, fiber-like capillary adsorption: The propellant sheets obtained in Step 1 are spread flat on the surface of a multi-level porous fiber-like capillary matrix, and allowed to adsorb statically. Through capillary effect, free water on the surface of the propellant sheets is driven to migrate along the porous channels of the matrix and be captured, removing the surface free water; The fiber-like capillary matrix is ​​composed of a cellulose skeleton phase, a silica aerogel porous control phase, a hydroxylated nanocellulose interface functional phase, and a polyurethane substrate supporting and stabilizing phase; Step 3, negative pressure physical dehydration; Step 4, chemical selective dehydration; Step 5, safe recycling. This invention has high dehydration efficiency, retains thermal stability, is safe and controllable, and has low cost.

This invention relates to the field of semiconductor power device technology, specifically to a GaN HEMT structure with an air cavity and its fabrication method. The structure includes a substrate, an epitaxial layer, a source, a drain, a gate, a composite passivation layer, and an air cavity. The composite passivation layer includes a bottom SiO2 sacrificial layer and a top SiN passivation layer. The SiO2 sacrificial layer between the gate and the source, and between the gate and the drain, is completely removed to form a global air cavity. The fabrication method involves epitaxial fabrication, active region isolation, source-drain-gate fabrication, composite passivation layer deposition, metal interconnect via etching, and wet etching of the sacrificial layer to form the air cavity, ultimately completing the metal interconnect. This invention simultaneously solves the dual technical problems of excessive parasitic capacitance and excessively long heat dissipation path caused by traditional passivation layers, significantly improving the high-frequency characteristics, thermal stability, and operational reliability of GaN HEMT devices. Moreover, the fabrication process is fully compatible with conventional GaN HEMT processes, requiring no special gate structure design, and is easy to industrialize and promote.

This invention discloses an amorphous / nanocrystalline alloy composite microwave absorbing film with a high bandwidth-to-thickness ratio, which is composed of an absorber and a flexible polymer matrix; the absorber is amorphous / nanocrystalline Fe. 85 The composite filler formed by anchoring SiAl6Cr8 alloy onto nitrogen-doped carbonized kapok fiber is denoted as NCKF / FSAC composite filler; the flexible polymer matrix is ​​waterborne polyurethane, denoted as WPU; the mass ratio of NCKF / FSAC composite filler to WPU is (6:4) to (9:1). Through the creative absorber composition structure, polymer matrix type and mass ratio of the two, the composite absorbing film has achieved the advantages of high bandwidth-to-thickness ratio, excellent flexibility and good thermal stability.

This invention discloses a method for preparing highly stable gyromagnetic ferrites, belonging to the field of magnetic material preparation technology. The method includes formulation preparation, multi-stage sand milling and granulation, molding and sintering, composite structure preparation, and precision machining steps. The formulation consists of VIII-series, IIIB-series, lanthanide-series, IVB-series, and VIIB-series metal oxides in a specific molar ratio, with rare earth nano-additives added to enhance lattice stability. Uniform slurry particle size is achieved through two-stage sand milling and spray granulation. A curved sintering process is used to control the temperature rise and oxygen content to obtain a high-density green body. A yttrium iron garnet or dysprosium iron garnet functional layer is formed on the surface of the green body by magnetron sputtering, constructing a multi-layer composite structure. Finally, a conductive modification layer is formed on the surface through integrated laser cutting and chemical mechanical polishing. The gyromagnetic ferrite material prepared by this method exhibits high saturation magnetization, low high-frequency loss, and excellent thermal stability, making it suitable for 5G communication, radar, and high-frequency microwave devices.

This application provides a method for preparing a heat-stable bio-based polyarylate, belonging to the field of high-performance polymer technology. A bio-based bisphenol monomer is dissolved in deionized water to obtain an aqueous phase system; an aromatic dichloro monomer is dissolved in an organic solvent to obtain an organic phase system; the aqueous and organic phase systems are mixed and subjected to an interfacial reaction; a precipitant is added to the separated organic phase to induce precipitation; the precipitate is collected, washed, and dried to obtain a heat-stable bio-based polyarylate with a glass transition temperature of 120-200℃ and a thermal decomposition temperature ≥350℃. This method has advantages such as high safety, green and sustainable raw materials, and good thermal stability and mechanical properties of the finished product.

The application relates to the technical field of quantum dot materials, in particular to a high-stability quantum dot composite material and a preparation method thereof. Quantum dot microspheres are formed by coating Ag-In-Zn-S quantum dots with silica to form core-shell structure microspheres, then the quantum dot microspheres, polydimethylsiloxane and silica are blended in ethyl acetate, uniform fluorescent suspension is formed through ultrasonic stirring, then the fluorescent suspension is sprayed onto the surface of a substrate, and the composite material is obtained through drying. The green I-III-VI multi-component quantum dot microspheres are used as the light-emitting substance, the excellent light-emitting stability is realized by combining the microspherization with the hierarchical porous structure constructed on the surface of the substrate. The spraying process is simple in equipment, low in cost and green in environment protection. The obtained composite material not only has good light-emitting characteristics, but also effectively isolates water vapor, chemical corrosion and other harsh environments through the multi-scale hierarchical porous structure formed on the substrate, thereby excellent thermal stability, chemical stability and weather resistance are exhibited.

This invention provides a deep moderating and displacement system suitable for fractured reservoirs, its preparation method, and its application. The moderating and displacement system comprises the following raw materials in parts by weight: 0.2-1 parts of partially hydrolyzed polyacrylamide (HPAM), 0.1-0.6 parts of polyethyleneimine (PEI), 0.2-0.4 parts of silane-modified micron-sized inorganic fibers, 0.1-0.8 parts of encapsulated citric acid, 0.02-0.2 parts of heat stabilizer, 0.02-0.1 parts of metal ion complexing agent, and 196.9-199.36 parts of water. The moderating and displacement system of this invention has low initial viscosity, small injection pressure gradient, strong shear recovery ability, significant deep plugging effect, and excellent long-term thermal stability. Furthermore, it can be adjusted according to the target reservoir temperature and the dominant fracture aperture, achieving effective adaptation to fractured reservoirs with different apertures.

This invention discloses a water-based formate annular protective fluid for deep-sea oil and gas field development and its preparation method, specifically relating to the field of chemical corrosion prevention in oil and gas field development. The fluid comprises the following raw material components by mass percentage: 15wt%-40wt% organic-inorganic salt composite base fluid, 3wt%-8wt% green composite corrosion inhibitor, 2wt%-5wt% composite oxygen scavenger, 1wt%-3wt% zwitterionic bactericide, 2wt%-4wt% composite scale inhibitor, 0.5wt%-2wt% high-pressure stabilizer, 0.3wt%-1.5wt% environmental synergist, 1wt%-3wt% natural gas hydrate inhibitor, with the balance being deionized water. This invention, by employing a specific compounded high-pressure stabilizer and an optimized composite salt-based liquid, can withstand high-pressure environments exceeding 30 MPa and maintain excellent physical and chemical stability within an extreme temperature fluctuation range of -10°C to 180°C. After testing at 180°C for 168 hours, the liquid showed no stratification, no precipitation, and minimal density change, demonstrating its outstanding thermal stability and pressure resistance, making it fully adaptable to the harsh working conditions in the deep sea, from low temperatures on the seabed to high temperatures at the bottom of wells.

This invention discloses a method for low-resistivity thin-film deposition, comprising the following steps: Step 1, the ceramic substrate is first pickled with 2% hydrochloric acid for 1-2 hours. After pickling, it undergoes initial treatment and activation to obtain an activated ceramic substrate; Step 2, preparation of the nickel plating solution: 7-12 g / L nickel sulfate, 15 g / L sodium tungstate, 31.5 g / L sodium hypophosphite, 35 g / L sodium citrate, 2 ml / L ammonia, and 5 g / L thiourea are stirred and mixed thoroughly to obtain the nickel plating solution. This invention enhances the contact effect between the activation solution and the substrate through the synergistic effect of the raw materials, thereby improving the performance of the product. Simultaneously, tungsten metal in the electroplating process possesses characteristics such as high temperature resistance, corrosion resistance, low temperature coefficient of resistance (TCR), and good thermal stability. Furthermore, the synergistic effect of the raw materials significantly improves the product's performance.

This invention discloses an expanded graphite-based microencapsulated fire extinguishing agent and its preparation method. The preparation method of the expanded graphite-based microencapsulated fire extinguishing agent of this invention includes the following steps: 1) preparing fluorine-modified expanded graphite; 2) preparing expanded graphite adsorbed with a fluorine-containing fire extinguishing agent; 3) dispersing the expanded graphite adsorbed with the fluorine-containing fire extinguishing agent in a solvent, then adding a solution containing silica sol, a silane coupling agent, a diamine, a polyisocyanate, and a catalyst to react, followed by product separation and purification to obtain the expanded graphite-based microencapsulated fire extinguishing agent. The expanded graphite-based microencapsulated fire extinguishing agent of this invention has advantages such as high fire extinguishing efficiency, good thermal stability, high safety, high mechanical strength, and good durability. Furthermore, its preparation method is relatively simple and the production cost is low, making it suitable for large-scale industrial production and application.

The application relates to the technical field of new materials, and discloses an antibacterial super-hydrophobic coating as well as a preparation method and application thereof. The antibacterial super-hydrophobic coating is prepared by loading an alkyl pyridine salt modified hydrophobic silicon dioxide and a titanium dioxide composite functional layer on electrospun polylactic acid nanofibers through dip coating and nitrogen curing processes. The antibacterial super-hydrophobic coating has both alkyl pyridine salt modified hydrophobic silicon dioxide sterilization and titanium dioxide photocatalytic sterilization double mechanisms, and is prepared by a mild process. The water contact angle of the prepared antibacterial super-hydrophobic coating is greater than or equal to 150 degrees, the sterilization rate is as high as 99.5%, the biocompatibility is excellent, and the thermal stability, acid and alkali stability and mechanical stability are strong. The preparation process is simple, environment-friendly and scalable, and is suitable for medical dressings, food packaging, water treatment membranes and other scenes, and solves the problems of single antibacterial property and insufficient environmental protection of existing coatings.

The application relates to the technical field of phosphazene flame retardants, and particularly discloses a high-performance low-cost phosphazene flame retardant and a preparation method thereof. The method comprises the following steps: first, purifying an industrial by-product mixed sodium phenate to obtain anhydrous mixed sodium phenate; then, under the action of a nucleophilic substitution promoter composed of an alkaline compound and a polar aprotic solvent, step-by-step nucleophilic substitution reaction is carried out by controlling feeding sequence, reaction temperature and other conditions; after the reaction is completed, high-purity phosphazene flame retardant products are obtained through vacuum concentration and water washing precipitation; meanwhile, unreacted sodium phenate and solvents are recycled and reused; and a complete green closed-loop production process is constructed. Through the unique promoter system and process design, the application effectively coordinates the reaction activities of different components in the mixed sodium phenate, inhibits side reactions, significantly reduces the cost of raw materials, ensures excellent thermal stability and flame retardant efficiency of the products, realizes near-zero emission and maximization of resource utilization, and has an outstanding industrial application prospect.

The embodiments of this disclosure disclose a wear-resistant rotor blade adjustment device and relate to the technical field of intake fans. [Solution] The wear-resistant rotor blade adjustment device includes an oil pump, an adjustment unit, and a blade shaft. The oil pump is connected to the adjustment unit and is used to supply high-pressure oil to the adjustment unit. The adjustment unit is connected to the blade shaft and is used to drive the rotation of the blade shaft with high-pressure oil to adjust the blade angle. The adjustment unit includes a shoe, and surface grease is applied to the surface of the shoe. The surface grease is molybdenum disulfide. By applying molybdenum disulfide grease to the surface of the shoe, wear and friction coefficient are reduced, wear resistance and abrasion reduction performance are improved, the thermal stability and sealing performance of the grease are improved, thereby achieving higher wear resistance and lubrication effect when adjusting the blade angle.

This invention discloses an APD laser rangefinder lens, which, from the object side to the image side along the optical axis, comprises: an aperture stop, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a narrowband filter, a protective window, and an imaging surface. The first and second lenses have positive optical power, the third, fourth, and fifth lenses have negative optical power, and the sixth lens has positive optical power. All lenses in the lens are spherical lenses and are all encapsulated and fixed by a single-material lens barrel. The equivalent focal length f of the lens satisfies: 299.9mm ≤ f ≤ 300.1mm, and the total optical length TL satisfies: 39.5mm ≤ TL ≤ 40.5mm, where the total optical length TL is the distance from the aperture stop to the imaging surface along the optical axis. This invention features an ultra-miniaturized design, high thermal stability, and high ranging accuracy, effectively solving the problems of large size and focal length drift caused by temperature changes in traditional long focal length lenses.

The utility model relates to bridge cable protection structure field discloses a kind of fire-resistant protective structure of bridge cable system, including heat insulation layer, fire-retardant sealing layer and protective layer sequentially arranged from inside to outside, and high-temperature-resistant adhesive glue is equipped between the heat insulation layer with the bridge cable. The heat insulation layer is excellent in thermal stability, and excellent in heat insulation effect;The fire-retardant sealing layer is formed by basalt fiber cloth or high-silica cloth and fire-retardant sealant, and the thickness of fire-retardant sealing layer is 3-6mm, and it is good in high-temperature resistance, fire resistance, vibration resistance and sealing property, and stable in structure;The high-temperature-resistant adhesive glue has excellent temperature resistance, adhesion, moisture resistance and vibration resistance. The protective layer uses silicone high-temperature paint, to further enhance the durability of protective structure. The fire-resistant protective structure of the bridge cable system has clear function, stable performance, easy construction, excellent heat insulation, fireproof and durable performance, and obvious comprehensive advantages.