4936results about "Heat-exchange elements" patented technology

The invention relates to an AI-driven intelligent design and preparation method of an inorganic hydrated salt phase change material, and solves the problem that the traditional technology is mainly based on experience trial and error and single performance optimization and cannot give consideration to multi-performance balance and multi-scene efficient adaptation development requirements of the inorganic hydrated salt phase change material. The method comprises the following steps: acquiring multi-dimensional performance requirements (including phase change temperature, latent heat value and the like) of a material, generating a candidate formula and a prediction result by using a trained Gaussian process regression model, and performing multi-objective optimization to screen out a Pareto optimal formula; and carrying out experimental verification and calculating deviation, retraining the model by complementary data exceeding a threshold value, and determining a final formula after reaching the standard so as to be matched with continuous process large-scale preparation. The method has the advantages that the AI replaces experience trial and error, multi-performance cooperation of materials is achieved, the research and development period is greatly shortened, the cost is reduced, and the method is suitable for multiple energy storage scenes.

A viscosity reduction system includes: a dispenser including: an inlet configured to receive a fluid; an outlet configured to dispense the fluid onto a surface; and a flow channel that fluidly connects the inlet with the outlet; and a vibrating device that directly contacts the dispenser at one or more locations and that is configured to vibrate the dispenser and the fluid when power is applied to the vibrating device.

The invention discloses a flexible PI heat-conducting insulating film pad and a preparation method thereof, and relates to the field of film pads. The preparation method comprises the following steps: preparing Fe3O4 magnetic heat-conducting core and SiO2 insulating shell composite nanoparticles by a sol-gel method, treating and grafting epoxy groups by a silane coupling agent, performing ring-opening addition with one end amino group of amino-terminated polydimethylsiloxane, and reacting the other end amino group with polyethylene glycol diglycidyl ether, so that two flexible long chains are grafted on SiO2. Due to the modified composite nanoparticles and the flexible long-chain structure, the flexibility of the film pad is remarkably improved; thermal vibration of silicon-oxygen bonds and ether bonds promotes heat transfer, a hydrogen bond network is formed with a PI substrate to improve dispersion stability, particles are orderly arranged under the action of a high-frequency magnetic field to construct a three-dimensional heat conduction network, and heat conduction efficiency is enhanced; the SiO2 isolates the inner core from conducting and improves the insulating property of the film pad by virtue of good insulativity and no free charge in the flexible long-chain polymer. The flexible PI heat-conducting insulating film pad prepared by the invention has the effects of flexibility, heat conduction and insulation.

The invention belongs to the technical field of refrigerants, and provides a mixed refrigerant for replacing R290 and a preparation method and application thereof, the mixed refrigerant comprises a first component, a second component and a third component; the first component is trans-1, 2-difluoroethylene, the second component is 2, 3, 3, 3-tetrafluoropropene, and the third component is trifluoromethyl methyl ether; compared with R290 refrigerants in the prior art, the mixed refrigerant has the advantages that flammable and explosive components do not exist, and high-risk combustible gas clusters cannot be formed due to density layering after leakage, so that the mixed refrigerant has high safety performance, and the safety level can be not lower than A2L; the mixed refrigerant has the environment-friendly characteristic of low GWP, the GWP is smaller than or equal to 150, and the environment-friendly requirement is met; the thermophysical property and the refrigeration and / or heating cycle performance of the mixed refrigerant are similar to or better than those of R290; the mixed refrigerant can be used for directly replacing an R290 refrigerant.

The invention provides a thermal interface material based on vinyl imidazole ionic liquid as well as a preparation method and application of the thermal interface material. The thermal interface material is prepared from the following raw materials: the vinyl imidazole ionic liquid, a heat-conducting filler subjected to surface treatment by a silane coupling agent, an initiator and a cross-linking agent. The thermal interface material is based on the vinyl imidazole ionic liquid and the heat-conducting filler, the limitation of a traditional thermal interface material base body is broken through, dispensing can be achieved, no solvent is needed in the preparation process, the adverse effect of solvent residues on the performance of a chip when the thermal interface material is applied to the chip subsequently can be avoided, and the thermal interface material has ideal interface bonding strength; the heat conduction effect is remarkable and stable, the heat stability is good, the material can be well attached to an interface, the problems of stress concentration, cracks and the like are not prone to occurring, and the material can be widely applied to the heat conduction and heat dissipation fields of aerospace, advanced energy, electronic information, military industry and the like.

The invention provides a self-repairing hydrated salt phase change microcapsule as well as a preparation method and application thereof, and belongs to the field of phase change materials. The preparation method comprises the following steps: preparing a hydrated salt phase change material and sorbitol into eutectic melt by adopting a melting method; strontium carbonate, sorbitol grafted nano titanium dioxide, SiO2-coated silicone rubber microspheres, hollow Al2O3 microspheres, tannic acid microcapsules, alpha-zirconium phosphate, melamine polyphosphate, diethyl aluminum hypophosphite, carboxylated multi-walled carbon nanotubes, polydopamine modified boron nitride nanosheets and hydrophilic fumed silica are added into the eutectic melt, and blending is performed to obtain a core material; The preparation method comprises the following steps: adding strontium carbonate, sorbitol grafted nano titanium dioxide, SiO2-coated silicone rubber microspheres, hollow Al2O3 microspheres, tannic acid microcapsules, alpha-zirconium phosphate, melamine polyphosphate, diethyl aluminum hypophosphite, carboxylated multi-walled carbon nanotubes, polydopamine modified boron nitride nanosheets and hydrophilic fumed silica into the eutectic melt; bio-based polyurethane-polyurea is used as a shell material, the core material is coated in the shell to prepare the microcapsule, and the temperature of the coating operation is not higher than the phase change temperature of the hydrated salt phase change material; the surface is coated with a super-hydrophobic coating. According to the invention, a solid filler system is constructed, and a low-temperature preparation process is combined, so that the phase-change microcapsule with high performance, high reliability and high safety is developed.

The invention discloses a high heat storage density stable thermochemical adsorption composite heat storage material and a preparation method thereof, the high heat storage density stable thermochemical adsorption composite heat storage material comprises 54%-57% by mass of mixed salt and 43%-46% by mass of a porous material, the mixed salt comprises MgSO4 and MgCl2, the mass ratio of MgSO4 to MgCl2 is 9: 1-6: 4, and the porous material is expanded perlite modified by nano alumina or a silane coupling agent. The high-heat-storage-density stable thermochemical-adsorption composite heat storage material provided by the invention is simple in preparation method, and the modified expanded perlite is used as a carrier of the mixed hydrated salt; the obtained composite heat storage material has excellent performance: the salt-containing load rate is 114-121%, the water absorption rate is 1.2-1.28 g / g, the heat storage density is 1123.5-1208.6 kJ / kg, the heat storage temperature is 133.4-141.3 DEG C, the structural strength is 10.346-12.631 kPa, the structural stability is 99.27-99.53%, and the stability is 79.7-83.3% after circulation for 30 times, that is, the composite heat storage material is high in heat storage density, high in water absorption rate, low in heat storage temperature, high in strength and not easy to scatter and fall off, and the composite heat storage material is suitable for large-scale production. And the material also has relatively good cycling stability.

To provide a coolant which exhibits relatively excellent fluidity even at low temperatures and can be easily handled and stored due to having a high flash point.SOLUTION: This coolant contains an organopolysiloxane represented by formula (1) (wherein R1 moieties are each independently a methyl group or an ethyl group, and n is 2 or 3), and is characterized in that the organopolysiloxane has a kinematic viscosity of 100 mm2 / s or less at -80°C and 300 mm2 / s or less at -100°C.SELECTED DRAWING: None

The invention discloses a reprocessable solid-solid phase change material based on dynamic borate bonds and a preparation method of the reprocessable solid-solid phase change material. Based on the mechanism that boric acid ester is subjected to ester exchange during thermal stimulation, a dynamic cross-linking agent containing boric acid ester is adopted for cross-linking a polyurethane prepolymer, polyethylene glycol is cross-linked through chemical bonds, the tensile strength and the elongation at break of the phase change material are improved, and the problem that the phase change material is prone to leakage in the phase change process is solved; besides, borate bonds belong to associated dynamic covalent bonds and can keep the crosslinking density of the material unchanged when ester exchange occurs under thermal stimulation, so that the thermal stability of the material is relatively good; the solid-solid phase change material disclosed by the invention is excellent in mechanical property, has a relatively high enthalpy value, can be reprocessed, and has an application prospect in the fields of thermal management, energy storage, infrared stealth and the like.

Liquid metal thermal interface materials and their uses in electronics assembly are described. In one implementation, a semiconductor assembly includes: a semiconductor die; a heat exchanger; and a thermal interface material (TIM) alloy bonding the semiconductor die to the heat exchanger without using a separate metallization layer on a surface of the semiconductor die or a surface of the heat exchanger. The TIM alloy may be formed by placing a TIM material between the semiconductor die and the heat exchanger, the TIM material comprising a first liquid metal foam in touching relation with the surface of the semiconductor die, a second liquid metal foam in touching relation with the surface of the heat exchanger.

Composite multilayered material compositions are provided which contain one or more hexagonal boron nitride (hBN)-containing layers, together with layers comprising optional polymeric binders, glass fibers, magneto-ceramic materials, and a super-hydrophobic outer coating. Methods are provided for making the composite materials and products containing them. The composite materials are useful for making radomes and other coverings for electronic components and equipment.

The invention discloses a multi-shell photo-thermal phase change microcapsule and a preparation method thereof, the multi-shell photo-thermal phase change microcapsule comprises a capsule wall and a capsule core, the capsule core is an organic phase change material, the capsule wall comprises a titanium dioxide layer, a graphene layer and a polydopamine layer, the graphene layer is located outside the titanium dioxide layer, and the polydopamine layer is located outside the graphene layer. The multi-shell photo-thermal phase change microcapsule disclosed by the invention can realize full-wave band capture, and is high in photo-thermal conversion efficiency and good in shell stability.

The invention discloses a compact phase change heat storage honeycomb structure heterogeneous metal microdroplet interactive printing forming method, and belongs to the field of metal additive manufacturing. According to the method, the characteristic that aluminum alloy and a phase-change material are a solubility gap system is utilized, a micro-droplet interactive printing forming method is adopted, and aluminum alloy micro-droplets and phase-change metal micro-droplet double nozzles are controlled to conduct collaborative printing by designing a honeycomb structure and planning a printing track, so that alternate deposition and space integration of a structural material and the phase-change material are achieved; therefore, the compact honeycomb metal phase change heat storage structure is prepared. Compared with a traditional method, the method has the advantages that high-density integrated printing forming of the aluminum alloy and the phase change metal heterostructure can be achieved without reserving a flow channel, an exhaust hole and a packaging auxiliary structure, the manufacturing process is simplified, meanwhile, the compactness and the overall sealing performance of the heat storage structure are remarkably improved, and the manufacturing cost is reduced. The problem of high-heat-flux heat management in a narrow space is solved.

The invention relates to the technical field of molten salt, in particular to nitro binary molten salt and a preparation method thereof. The preparation method comprises the following steps: mixing sodium carbonate and a potassium hydroxide solution, and then adding a starch-based grafted crystal inhibitor to inhibit crystallization; adding a nitric acid aqueous solution in two stages, and introducing eutectic seed crystals to guide nucleation at the end of the first stage; crystal distribution is optimized through falling film evaporation and concentration and setting of partial reflux; and after spraying granulation, carrying out short-time melting reforming and controlled cooling in an inert atmosphere. According to the method, the composition uniformity and the structural stability of the molten salt are remarkably improved, so that the product has a melting point close to a theoretical eutectic point, low supercooling degree, high melting latent heat and excellent thermal cycling stability and corrosion resistance, and is suitable for an industrial heat storage system running for a long time.

The invention relates to the technical field of phase change energy storage materials, in particular to a phase change wax composite material and a preparation method thereof. The phase change wax composite material is prepared from the following raw materials in parts by mass: 60 to 66 parts of modified paraffin, 4 to 6 parts of elastomer, 20 to 25 parts of modified heat-conducting filler and 6 to 9 parts of flame retardant. Through multi-scale interface design and component function cooperation, the performance bottleneck of a traditional phase change material is broken through, unification of high energy storage density, efficient heat management and long-acting safety is achieved, and the phase change material is particularly suitable for application scenes needing efficient energy storage and heat management.

The present disclosure provides a heat absorber with a low heat absorption starting temperature and excellent heat absorption amount, flame retardancy, and cushioning properties, and a secondary battery module including the heat absorber. The heat absorber includes a bag configured to be filled with a content, and a hydrogel to fill the bag as the content. The hydrogel has a three-dimensional network structure and is synthesized using a water-soluble organic monomer as a reaction material. The heat absorber is useful, in particular, as a heat absorber for secondary batteries.

The invention relates to the technical field of liquid cooling, and discloses a cooling liquid composition, a preparation method and application thereof and an immersed cooling device. The cooling liquid composition is prepared from the following components in parts by mass: 30 to 50 parts of hydrogenated dipolydecene, 10 to 40 parts of II-type base oil and 10 to 40 parts of III-type base oil. Through mutual cooperation and optimization of the components, the low-cost and high-performance cooling liquid composition and the preparation method thereof are developed, and the provided cooling liquid composition has the characteristics of high flash point, large specific heat capacity, low kinematic viscosity, large breakdown voltage and good copper corrosion rating, can be applied to an immersed liquid cooling heat dissipation system and an immersed cooling device, and has good application prospects. The requirements for flowability, electrical insulation and metal compatibility are met, and excellent safety and heat exchange performance are shown.

The invention relates to microcapsule phase change cooling liquid and a preparation method thereof, and belongs to the technical field of high polymer materials. The microcapsule phase change cooling liquid comprises the following components in parts by weight: 40-55 parts of ethylene glycol, 30-45 parts of deionized water, 5-14 parts of a core material, 3-6 parts of a wall material, 0.1-0.4 part of a dispersion stabilizer, 0.1-0.4 part of a corrosion inhibitor and 0.1-0.4 part of a modified antirust agent, the microcapsule phase change cooling liquid prepared by the invention not only has a good cooling effect, but also has excellent rust-proof and flame-retardant effects.

The invention relates to a liquid metal gel material, a preparation method thereof and a thermal interface material, and belongs to the field of thermal interface materials. Wherein the liquid metal gel material comprises a modified polyethylene film, and the modified polyethylene film comprises a polyethylene film and metal particles attached to at least part of the surface of the polyethylene film; the modified polyethylene film is at least partially filled with the liquid metal. The liquid metal gel material provided by the invention has the advantages of low thermal resistance, high thermal conductivity, excellent mechanical properties and high stability in a dynamic environment, and can meet the use requirements of high-end fields on thermal interface materials.

The present invention relates to a method for controlling physical properties of a silicon nitride substrate, and more specifically, the method comprises the steps of: producing a silicon nitride substrate; and adjusting a residual magnesium content in the silicon nitride substrate. The thermal conductivity of the silicon nitride substrate is inversely proportional to the residual magnesium content in the silicon nitride substrate, and the flexural strength of the silicon nitride substrate is proportional to the residual magnesium content in the silicon nitride substrate.

The invention relates to the technical field of organic functional molecule synthesis, and particularly discloses a lactone unit embedded bissanthin compound as well as a synthesis method and application thereof. According to the method, a synthesis strategy from bottom to top is adopted, and a lactone unit is embedded into bay area positions on two sides of bissanthin, so that a compound A is successfully obtained. Meanwhile, the compound A shows a self-absorption characteristic under different solution concentrations, and when the compound A is prepared into nano particles, the nano particles show relatively high stability and 65% photothermal conversion efficiency in a photothermal performance test.

A high thermal conductive silicone composition including: (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups in one molecule and a kinematic viscosity at 25 C of 100 to 100,000 mm2 / s; (B) an aluminum powder having an average particle size of 50 μm or more; (C) a thermal conductive filler having an average particle size of 0.1 to less than 50 μm; (D) an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to a silicon atom (Si—H groups) in one molecule; (E) a hydrolyzable organopolysiloxane represented by the following general formula (1); and (F) a platinum group metal catalyst having an effective amount. The high thermal conductive silicone composition can conform to the warpage of a substrate due to an increased material thickness and can maintain heat dissipation performance due to a high thermal conductivity.

A high-thermal-conductivity phase change sheet and a preparation method therefor. The high-thermal-conductivity phase change sheet is prepared from the following raw materials in parts by mass: 3-5 parts of a resin, 80-100 parts of a thermally conductive filler, 0.1-1 part of a treating agent, 0.1-1 part of an antioxidant, and 1-2 parts of a phase change material, wherein the resin is low-molecular-weight polyisobutylene, the thermally conductive filler comprises aluminum powder of 10 μm, aluminum powder of 2 μm and zinc oxide of 0.2 μm, and heat treatment and vacuumizing operation are involved in the preparation process.

Disclosed are exemplary methods for rheologically controlling a metal amalgam by including non-refractory filler particles (e.g., non-refractory metal filler particles, etc.) for processing and reliability enhancement as a thermal interface material. An exemplary method may comprise rheologically controlling a metal amalgam including filler particles (e.g., non-refractory metal filler particles, etc.) for use as a thermal interface material without sacrificing thermal conductivity and while maintaining rheology and spread control (e.g., limiting or preventing material migration, etc.) when pressed between two substrates. An exemplary method may comprise using non-refractory (not corrosive resistant) filler particles (e.g., non-refractory metal filler particles, etc.) to achieve a stable homogenous metal amalgam suspension with viscosity control based on total filler particle loading without sacrificing thermal performance for thermal interface material applications. The rheology controlled metal amalgam may be used as a thermal interface material between a heat source and another component of an electronic device.

A phase-change heat-storage foamed concrete, and a preparation method and use thereof are provided. The phase-change heat-storage foamed concrete provided by the present disclosure is prepared from raw materials including, in percentages by mass: 50-70% of a cement, 2-20% of a supported phase-change material, 15-35% of water, 0.1-0.5% of a water-reducing agent, 0.5-1.5% of a foam stabilizing agent, 0.5-2% of an aqueous hydrogen peroxide solution, and 0.1-0.4% of a hydrogen peroxide decomposition catalyst. The supported phase-change material includes an acid-modified fly ash and a paraffin supported on a surface and in a pore structure of the acid-modified fly ash, and the aqueous hydrogen peroxide solution has a mass percentage concentration of 25-30%.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention discloses wide-temperature-range self-repairing gradient ceramic fire extinguishing foam, a preparation method and application of the foam in an electrochemical energy storage device, and belongs to the technical field of new energy battery safety. Aiming at the technical bottleneck of a traditional fire extinguishing material in coping with a thermal runaway fire disaster of an electrochemical energy storage device, the defects of an existing material in the aspects of extreme temperature adaptability, electrolyte compatibility and long-acting flame retardance are overcome through unique three-layer gradient structure design and material innovation; the technical bottlenecks of wide temperature range stability, an intelligent response mechanism and after-combustion blocking capacity are broken through, the ultra-wide temperature range structural stability from-50 DEG C to 1600 DEG C is achieved, millisecond-level response to different electrolytes is achieved, and a self-repairing barrier after fire extinguishment can be built. The innovation point is that the gradient ceramic structure design, the dynamic response mechanism and the self-repairing circulating system are adopted, so that the equal-depth fire reignition rate of the lithium battery can be obviously reduced, and the application prospect is wide.

The invention provides energy storage battery immersed cooling liquid based on fluorinated nanofluid and a preparation method, and belongs to the technical field of heat management of energy storage equipment, the energy storage battery immersed cooling liquid comprises 74-84% of perfluoropolyether base liquid, 10-15% of surface modified boron nitride nanosheets, 5-8% of microencapsulated perfluorohexanone and 1-3% of polydimethylsiloxane modified silicon dioxide. Microencapsulated perfluorohexanone is integrated into the cooling liquid to achieve the dual functions of heat dissipation and fire extinguishment, and synergistic effects are generated in the aspects of heat conduction, insulation, fire extinguishment and the like through combined use of the perfluoropolyether base liquid, the surface modified boron nitride nanosheets, the microencapsulated perfluorohexanone and polydimethylsiloxane modified silicon dioxide and specific modification performance of the perfluoropolyether base liquid, the surface modified boron nitride nanosheets, the microencapsulated perfluorohexanone and the polydimethylsiloxane modified silicon dioxide. And experimental data can prove that the comprehensive performance of the material has substantive features and remarkable progress in the aspects of heat conductivity coefficient improvement, fire extinguishing time and the like.

The invention belongs to the technical field of civil engineering materials, and discloses a thermal-mechanical property synergistically enhanced energy storage concrete phase change aggregate and a preparation method of the phase change aggregate. Water-soluble polyethylene glycol is used as a phase change material, ceramsite is used as an adsorption carrier, and phase change ceramsite is prepared in a vacuum adsorption mode; the modified cement coating material is adopted to package the phase change ceramsite, and the phase change aggregate is obtained; wherein the modified cement coating material is prepared from the following raw material components in percentage by mass: 66.60 percent to 66.70 percent of quick-hardening sulphoaluminate cement, 22.70 percent to 30.60 percent of mixing water and 2.70 percent to 10.70 percent of a modifier; the modifier is prepared from the following raw material components in percentage by mass: 0.50% of graphene nanosheets, 0.07% of a polycarboxylate superplasticizer and 99.43% of deionized water. The phase change aggregate disclosed by the invention is low in leakage rate, good in thermal stability, high in strength and good in adhesive property with a cement matrix material.

The invention discloses an immersed heat dissipation composite phase change cooling liquid, which is prepared from the following components in parts by weight: 97.0 to 99.7 parts of basic liquid, 0.1 to 1.5 parts of antioxidant and heat stabilizer, 0.1 to 0.8 part of corrosion inhibitor and 0.1 to 0.5 part of state monitoring tracer agent, the invention has the advantages of high-efficiency phase change heat dissipation capability, excellent electrical insulating property, long-term chemical stability, corrosion resistance and leakage monitoring property.