54results about How to "Improve thermal performance" patented technology

This application relates to the field of polymer materials technology, providing a PET elastomer, composite material, dynamic covalent network polymer, and its preparation method and application. The elastomer is prepared by in-situ self-assembly of crown ether-primary amide dual-functionalized PET through melt blending. Its molecular network integrates a quasi-rotaxane supramolecular crosslinking network. This structure is formed by the host-guest interaction between the crown ether and the primary amide, and can act as a sliding crosslinking point to dissipate energy through the sliding of cyclic components. This application employs a two-step end-capping-in-situ self-assembly process to overcome the technical obstacles of low PET chain-end activity and poor compatibility between polyrotaxane and PET, achieving molecular-level dispersion of quasi-rotaxane in the PET matrix. This fully utilizes the molecular pulley effect to achieve breakthrough toughening of the elastomer. Simultaneously, it combines rigid nanofillers modified with aminosilane coupling agents to form a soft-hard synergistic network, enabling the PET composite material to maintain high toughness while simultaneously improving strength, modulus, and thermal properties.

The invention discloses a preparation method of a graphene copper-based composite material, and belongs to the technical field of copper-based composite materials. The method comprises the following steps: (1) carrying out surface pretreatment on a copper foil; (2) dropwise adding the graphene dispersion liquid on the surface of the copper foil, and drying the copper foil after the graphene dispersion liquid is freely diffused until the graphene dispersion liquid covers the surface of the copper foil; (3) stacking the copper foils in a manner that a graphene layer is arranged between two layers of copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain a hot-pressed composite material; (4) annealing the hot-pressed composite material to obtain an annealed composite material; (5) carrying out cold rolling on the annealed composite material to obtain a rolled composite material; and (6) the rolled composite material is subjected to annealing treatment, and the graphene copper-based composite material is obtained. On the basis of simplifying the preparation process and reducing the preparation demand conditions, the graphene is promoted to effectively and fully exert the strengthening effect, and the comprehensive performance of the composite material in multiple aspects is improved.

The invention relates to a self-adaption-based thermally induced solid dimming material as well as a preparation method and application thereof. The dimming material is prepared from the following components in percentage by weight: 75 to 85 percent of octadecyl acrylate and 0 to 7 percent of allyl methacrylate. The thermotropic solid dimming material is used for preparing a self-adaptive thermochromic PVB (Polyvinyl Butyral) film. According to the invention, the powder material is embedded into the transparent resin, so that the temperature-sensitive characteristic of the film is enhanced, and the octadecyl acrylate monomer is used in emulsion polymerization, so that a thermotropic solid-state dimming material capable of changing color in a thermal response manner can be generated. A certain content of octadecyl acrylate in polymer synthesis enables the thermotropic solid dimming material to change color at the highest temperature of 40.2 DEG C, and the visible light transmittance exceeds 90%. In addition, by changing the content of allyl methacrylate, the discoloration temperature of the film can be finely adjusted in the range of 24.5 DEG C to 39.5 DEG C.

The application discloses a plant-based water-based adhesive and a preparation method thereof, and relates to the technical field of water-based adhesives. When the plant-based water-based adhesive is prepared, 2,4-dihydroxybenzophenone and acryloyl chloride are reacted to obtain an acrylate-based benzophenone; the silicon dioxide treated by a silane coupling agent is reacted with the acrylate-based benzophenone to obtain modified silicon dioxide; 4-methylumbelliferone is sequentially reacted with hexamethylene diisocyanate and 2-amino-2-methyl-1,3-propanediol to obtain an umbelliferone diol; castor oil, polybutylene adipate, the umbelliferone diol, dimethylol propionic acid and isophorone diisocyanate are copolymerized, neutralized by triethylamine and emulsified by deionized water to obtain a polyurethane emulsion; and the polyurethane emulsion and the modified silicon dioxide are mixed to obtain the plant-based water-based adhesive. The plant-based water-based adhesive provided by the application has excellent mechanical properties and weather resistance.

This invention relates to a photocurable polymer composition for 3D printers, comprising a UV-curable polyurethane oligomer, a photoinitiator, a silane coupling agent, oligomers, and a stabilizer. According to the aforementioned photocurable polymer composition for 3D printers, 3D printed outputs with excellent physical properties such as thermal properties, strength, elastic modulus, and elongation can be manufactured, and 3D printed outputs that can restore their original shape even if deformed through use.

This invention relates to the field of polymer materials technology, and more particularly to a hydroxyl-terminated polyarylene ether and its preparation method. The preparation method of the hydroxyl-terminated polyarylene ether of this invention includes: preparing a monomer solution containing 2,6-dimethylphenol and tetramethylbisphenol; polymerizing the monomer solution with an oxidant; adding a chelating agent aqueous solution to quench the polymerization reaction after the polymerization is completed; washing the obtained hydroxyl-terminated polyarylene ether solution with the washing wastewater generated during the production of thermosetting capped polyarylene ethers; allowing it to stand; and separating the solutions to obtain the hydroxyl-terminated polyarylene ether. This invention's method for preparing hydroxyl-terminated polyarylene ethers utilizes a large amount of washing wastewater generated during the production of thermosetting capped polyarylene ethers to wash the hydroxyl-terminated polyarylene ethers, which can effectively remove amine substances, save wastewater treatment steps, achieve resource utilization, and improve the thermal properties of the hydroxyl-terminated polyarylene ethers.

The invention discloses a half-bridge power module packaging optimization method, and belongs to the technical field of power module packaging, and the method comprises the steps: S1, analyzing the thermodynamic performance of a power module; s2, establishing a two-dimensional power module finite element model; s3, based on finite element simulation, researching the influence of temperature on the service life and stress strain of the module; s4, based on finite element simulation, obtaining the thermal resistance value of each layer of material and the ratio of the thermal resistance value to the total thermal resistance value; s5, analyzing the relationship between the packaging parameters and the thermal impedance, and giving an optimization direction from the packaging level by integrating the temperature and the stress; and S6, establishing a thermal network model, extracting junction temperature through electrothermal coupling, and verifying life increase. By the adoption of the half-bridge power module packaging optimization method, the size of the module can be reduced, temperature resistance and stability can be enhanced, the problem of multi-physics field coupling can be solved, internal thermal impedance and stress strain can be remarkably reduced, thermal performance can be improved, and the service life of the power module can be effectively prolonged through verification of the working condition of a photovoltaic inverter.

The utility model discloses an intelligent adjusting type electric control inhaul cable in the technical field of automobile inhaul cables, which comprises a double-shaft motor, output ends on two sides of the double-shaft motor are respectively and fixedly connected with a first connecting shaft and a second connecting shaft, one end of the first connecting shaft is fixedly connected with a first screw rod, and the other end of the first connecting shaft is fixedly connected with a second screw rod. A second lead screw is fixedly connected to one end of the second connecting shaft, a second inhaul cable body is arranged on the surface of the second lead screw, a first inhaul cable body is arranged on the surface of the first lead screw, and a first sleeve rod is rotationally connected to one end of the first inhaul cable body in a limiting mode; through arrangement of a first tension sensor, a second tension sensor, an optical fiber sensor, a temperature sensor and a humidity sensor, changes of temperature, humidity and tension of the first inhaul cable body and the second inhaul cable body can be monitored in real time, so that a driver can know the working condition of the inhaul cable in real time through a vehicle-mounted display screen, and problems can be found and solved in time; and the safety and the reliability of the vehicle are improved.

This invention discloses a fluorinated polyimide containing phenyl anthracene and its preparation method, belonging to the field of polymer materials technology. The fluorinated polyimide containing phenyl anthracene has the following molecular structure: by introducing asymmetric phenyl anthracene structural units with trifluoromethyl side groups, flexible ether bonds, and twisted non-coplanar structures into the polymer backbone, this polyimide possesses excellent comprehensive properties, such as superior solubility, heat resistance, optical properties, mechanical properties, crystallinity, dielectric properties, and hydrophobicity.

The invention discloses a PET (Polyethylene Terephthalate)-based carbon dot which is prepared by taking PET waste as a precursor and adopting a one-step pyrolysis method, and the PET-based carbon dot has remarkably improved fluorescence quantum yield and has a good flame-retardant modification effect on polymers such as PET / PA6 (Polyethylene Terephthalate) / PA6 (Polyamide 6) / PA66 (Polyamide 66) and the like.

The application provides a bismaleimide-polyether amine photocuring resin and a preparation method thereof. 100 parts of bismaleimide and 100-200 parts of polyether amine are pre-reacted, 0.001-5 parts of a catalyst, 0.001-1 parts of a polymerization inhibitor and 100-400 parts of glycidyl methacrylate are added to carry out grafting reaction, and the bismaleimide-polyether amine photocuring resin is obtained. The bismaleimide-polyether amine photocuring resin provided by the application has the characteristics of realizing photocuring through ultraviolet light irradiation on the basis of retaining the excellent thermal performance and good mechanical performance of traditional bismaleimide, and effectively solves the problem of poor forming performance. The method disclosed by the application has simple process and mild reaction conditions, is suitable for industrial production, and the prepared material has wide application potential in the fields of photocuring printing and electronic packaging.

The utility model discloses an inward tilt-turn window waterproof structure and an inward tilt-turn window with the inward tilt-turn window waterproof structure. The inward tilt-turn window waterproof structure comprises a first profile and a second profile. A first sealing strip is arranged at the front end of the side face of the first profile, a second sealing strip is arranged in the middle of the side face of the first profile, and a first sealing part is arranged at the rear end of the side face of the first profile. The second section bar is a side frame of an inward tilt-turn window sash, the second section bar and the first section bar are oppositely arranged, a second sealing part is arranged at the front end of the side face of the second section bar, a first heat insulation rubber strip is arranged in the middle of the side face of the second section bar, and a third sealing strip is arranged at the rear end of the side face of the second section bar. When the inward tilt-turn window sash is in a closed state, the first sealing strip abuts against the second sealing part in a sealed mode, the first heat insulation rubber strip abuts against the second sealing strip in a sealed mode, the third sealing strip abuts against the first sealing part in a sealed mode, and the third sealing strip abuts against the second sealing part in a sealed mode. A first isobaric cavity and a second isobaric cavity which are adjacent front and back are formed between the first sectional material and the second sectional material, and both the first isobaric cavity and the second isobaric cavity are communicated with the outside. Through fine design of specific components and formation of the isobaric cavity, the waterproof performance and the thermal performance of the window and the stability and the durability of the whole structure are remarkably improved, and a more comfortable, safer and energy-saving living environment is provided for a user.

The application relates to a preparation method of a graphene composite phase change thermal interface material. An oxidized graphene dispersion liquid is provided, a centrifugal roller coating and a layer-by-layer drying process are adopted to form a multilayer oxidized graphene unit layer on a substrate, and an oxidized graphene film is obtained; the oxidized graphene film is placed in a limited space, gradient heat reduction treatment is carried out, the film is controllably expanded in the out-of-plane direction, and a reduced graphene oxide film with a micro-nano cavity structure is formed; the reduced graphene oxide film is subjected to graphitization treatment, and a graphene micro-nano cavity film is obtained; through a vacuum impregnation method, a molten phase change material is filled into the micro-nano cavity structure of the graphene micro-nano cavity film. The thermal interface material has high phase change enthalpy (196.2 J / g), excellent thermal performance (in-plane thermal conductivity 65.5 W.m ‑1 ·K ‑1 , out-of-plane 21.9 W.m ‑1 ·K ‑1 , and low interface thermal resistance (0.575 K.cm 2 ·W ‑1 ).

This utility model discloses a double-thermal-break insulated aluminum alloy exterior window profile, including a window frame and a window sash. The window sash includes an outer frame and an inner frame disposed on both sides of the insulated glass. A core frame is also disposed between the outer frame and the inner frame. A first window sash thermal insulation strip is disposed between the core frame and the outer frame, and a second window sash thermal insulation strip is disposed between the core frame and the inner frame. The window frame includes an outer frame and an inner frame, both of which are fixed to the wall. A core frame is also disposed between the outer frame and the inner frame. A first window frame thermal insulation strip is disposed between the core frame and the outer frame, and a second window frame thermal insulation strip is disposed between the core frame and the inner frame. Compared with conventional aluminum alloy exterior window profiles, this utility model improves thermal performance by 20%, effectively reducing building energy consumption.

The utility model discloses an integrated rack with a unilateral moving closed channel, which comprises a rack body with openings in the front side and the rear side, a moving shell with a U-shaped section is arranged on the rear side of the rack body, and the rack body is mounted in the moving shell from the openings of the moving shell. A gap is reserved between the rear side of the rack body and the rear side wall of the movable shell and forms an air passing channel. The left side and the right side of the movable shell are movably connected with the outer walls of the left side and the right side of the rack body correspondingly, and the movable shell can move front and back relative to the rack body, so that the size of the air passing channel is changed. The utility model has the beneficial effects that the air passing channel is closed, so that the loss of cooling capacity or the backflow of hot air is prevented, and the cooling capacity and the thermal performance of the whole rack are improved. And meanwhile, the area of the air passing channel can be changed by moving the shell, so that the change of actual engineering is adapted.

According to the point constraint automatic assembly mold for the nuclear fuel assembly grillwork, a stable installation foundation is provided for a clamp body through a first space in a mold frame, and the clamp body is provided with a plurality of first channels and second channels which are arranged in the first horizontal direction and the second horizontal direction in a crossed mode; the first strip and the second strip are contained in the first strip and the second strip respectively; a plurality of mounting cavities are formed in one side of each first channel, pressing structures are arranged in the mounting cavities in a one-to-one correspondence manner, and uniform pressing force can be applied to the first strip from the side direction under the synergistic effect of a driving structure; the structure fully adapts to the material characteristics of thin wall and weak rigidity of the nuclear fuel grillwork strip, not only effectively avoids the problems of strip indentation, scratch and deformation easily caused by a traditional rigid clamp, but also remarkably reduces the introduction of additional stress in the assembly process, thereby preventing the structure instability of the grillwork caused by stress release in the follow-up use, and improving the service life of the nuclear fuel grillwork. And the assembly quality, the structural integrity and the long-term service reliability of the nuclear fuel grillwork are comprehensively guaranteed.

The invention provides an X-ray tube anode target disc as well as a preparation method and application thereof. The X-ray tube anode target disc comprises a WRe-molybdenum alloy metal target material layer, a transition solder layer and a silicon carbide heat storage matrix which are sequentially compounded from top to bottom, the molybdenum alloy is selected from TZM, MHC and molybdenum lanthanum alloy; the transition solder layer is a Zr layer or a Ti layer; a non-welding surface of the silicon carbide heat storage substrate is provided with an aluminum oxide-titanium oxide blackening coating, and the room-temperature heat radiation coefficient of the aluminum oxide-titanium oxide blackening coating is 0.80 or above. The X-ray tube anode target disc has remarkably improved thermal performance, welding stability, mechanical performance and efficient thermal radiation heat dissipation performance.

This utility model belongs to the field of building door and window technology, specifically to a high-performance aluminum alloy system door, including a low threshold, a door frame, a door leaf, and glass. The low threshold includes an interior threshold profile and an exterior threshold profile. Each of the interior and exterior threshold profiles has a cavity. A thermal insulation strip connects the interior and exterior threshold profiles. The interior threshold profile is higher than the exterior threshold profile, and on the interior side of the interior threshold profile, it has a rounded corner and its upper surface slopes upwards to the other side. A threaded hole wall is provided in the inner cavity of the upper surface. The upper surface of the exterior threshold profile has anti-slip textures, and a threaded hole wall is also provided in the inner cavity of its upper surface. In this utility model, the structural design of the low threshold, through the natural transition between high and low slopes and the cross-sectional design of the double-layer sealing structure, avoids dust accumulation or tripping hazards at right-angle bends, while ensuring unobstructed passage for wheelchairs and strollers.

The invention relates to the technical field of novel building energy-saving materials and green building materials, in particular to a heat insulation board for a portable house and a preparation method of the heat insulation board. According to the invention, a unique multi-layer composite structure of exterior decoration protection, radiation buffering, main heat preservation, heat insulation enhancement, intelligent temperature adjustment and interior decoration is constructed, and frontier technologies of radiation reflection, vacuum heat insulation, phase change energy storage, intelligent temperature adjustment and the like are creatively integrated. All the functional layers are synergistically combined through well-designed interface treatment and a gradient modulus adhesive system, and the technical problems of stress concentration, interface stripping and the like caused by physical property difference between different material layers of a traditional insulation board are solved. The thermal insulation board prepared by the invention not only realizes ultralow heat conductivity coefficient and excellent fireproof safety level, but also has dynamic thermal response capability, can automatically adjust indoor thermal comfort according to environment temperature, and also has healthy environment regulation and control functions such as antibiosis and release of negative oxygen ions.

The utility model provides a bidirectional solid state circuit breaker module comprising a first sub-module and a second sub-module, the first sub-module comprises a first part, and the second sub-module comprises a second part. At least the first part of the first sub-module and at least the second part of the second sub-module have the same configuration and are symmetrically arranged relative to each other. Each of the first part and the second part comprises a substrate and at least two power semiconductors and at least one energy absorption element which are arranged on the substrate, and the at least one energy absorption element is arranged in the middle of the substrate; the at least two power semiconductors are arranged around the at least one energy absorbing element.

This invention belongs to the field of polymer composite materials technology, specifically relating to a method for reducing the crystallinity of polyamide composite materials. The method for reducing the crystallinity of polyamide composite materials includes the following steps: adding pure polyamide and glass fiber in a certain proportion to a twin-screw extruder for melting, extrusion, cooling, drying, and pelletizing, then pressing the pellets on a compression molding machine. After compression molding, the product undergoes a moisture conditioning treatment to reduce its crystallinity and improve the stability and durability of the product.

The invention discloses a commercial vehicle one-driving-two integrated controller power brick structure and a heat dissipation control method thereof. The commercial vehicle one-driving-two integrated controller power brick structure is specially applied to a dual-motor-driven commercial vehicle. Elements such as a filter assembly, a bus capacitor, a power module assembly and a control panel are integrated in a specific inversion brick shell, meanwhile, a heat dissipation device is arranged at the bottom of an inversion brick, a heat dissipation water channel of the heat dissipation device is designed in a U-shaped parallel mode, it is ensured that each power module is fully cooled, and uneven heat dissipation caused by too high water temperature is prevented; the heat dissipation distance is lengthened, and the heat dissipation effect is improved; a plurality of fixed-section throttling holes are formed in the water inlet position of the heat dissipation water channel, so that the pressure drop difference of the two water flow branches is reduced, and the flow limiting effect is achieved; in addition, a triangular guide structure is arranged at a branch opening of the water path to guide the flow direction of the water flow, and secondary flow equalization is carried out through a throttling hole of the power module; the water channels are designed to be unequal-width water channels, higher flow speed and higher heat exchange in the heat source area are achieved under the action of the guide ribs, and resistance and flow in the non-heat-source area are reduced.

The application belongs to the technical field of composite phase change materials, and particularly relates to a preparation method of a corn cob / steel slag binary solid waste composite phase change energy storage material, which comprises the following steps: taking corn cob and steel slag as base matrix raw materials, performing carbonization treatment on the corn cob to construct a porous network cross-linked carbon matrix, performing high-temperature calcination treatment on the steel slag to reconstruct crystals, and mixing and co-sintering to form a binary solid waste framework. A phase change material is loaded into the binary solid waste framework through an immersion adsorption method, and finally the corn cob / steel slag binary solid waste composite phase change energy storage material is obtained. The application realizes resource utilization of solid wastes which are widely sourced and low in cost. The porous structure has adsorption performance and heat conduction performance. The solid waste composite phase change energy storage material prepared by the application has excellent heat storage performance and good stability and is not prone to leakage, and has a wide application prospect.

The application provides a kind of suitable for ALC board system ultra-low energy consumption building outer door and window installation structure, including ALC board, flat steel, external thermal insulation, hook bolt, channel steel, angle steel, heat insulation pad, heat insulation gasket, outer window frame, filling insulation, waterproof vapor permeable membrane, waterproof vapor barrier film, pre-pressing expansion sealing tape, metal window sill plate, channel steel is connected with building main body by flat steel, heat insulation pad is fixed in channel steel, outer window frame is fixed on heat insulation pad, heat insulation gasket separates outer window frame and channel steel, filling insulation is filled between outer window frame and ALC board, waterproof vapor barrier film one end is pasted on outer window frame, one end covers angle steel and hook bolt and is pasted on ALC board, waterproof vapor permeable membrane one end is pasted on outer window frame, the other end covers filling insulation and hook bolt and is pasted on ALC board, external thermal insulation double staggered joint is laid on ALC board, external thermal insulation covers filling insulation upwards, metal window sill plate is fixed between filling pre-pressing expansion sealing tape between outer window frame below and external thermal insulation.

The application discloses a kind of chemical-resistant polycarbonate modified plastics and preparation method thereof, it is related to non-metallic additive material technical field.The modified polycarbonate, polyphenylene sulfide, flame-retardant photocuring agent, antioxidant, ultraviolet absorber, solvent-resistant diluent, nano-reinforced filler, boron nitride nanosheet, chopped carbon fiber, nano-barium sulfate, chemical-resistant toughening agent and leveling agent are weighed according to weight part, and premixing is carried out to obtain premixing liquid, three-roll grinding dispersion is carried out to obtain premixing material, vacuum defoaming is carried out to obtain crude resin material, DLP printing (3D printing) is formed, and then warm water debonding, step curing treatment is carried out, to obtain chemical-resistant polycarbonate modified plastics with excellent chemical resistance, mechanical properties, thermal properties and flame retardant properties.

The reinforced ceramic filter plate comprises a supporting layer, a transition layer and a surface functional layer which are sequentially arranged from bottom to top, and further comprises a metal net framework, the supporting layer, the transition layer and the surface functional layer take aluminum silicate fibers as reinforcing phases, and take silica sol, modified epoxy resin and nano kaolin as matrix phases; the content of Al2O3 in the aluminum silicate fiber is 45-55%, the content of SiO2 is 45-55%, and the diameter of the aluminum silicate fiber is 6-10 [mu] m; according to the invention, the metal net skeleton is additionally arranged to cooperate with fiber reinforcement, gradient layered structure design and low-temperature curing process, so that the preparation energy consumption is reduced, the filtering performance is improved, and the mechanical strength and impact resistance of the filter plate are further enhanced.

The utility model relates to the field of dies, in particular to an alloy die which comprises a die body and a metal layer, the die body is in a convex shape, the die is formed by compounding aluminum alloy sheets, the metal layer covers the outer surface of the die body, and the aluminum alloy sheets are exposed out of the bottom of the die body. The utility model aims to solve the technical problem of slow heat dissipation of the existing mold.

This invention relates to the field of high-temperature protective coating technology, specifically disclosing a marine corrosion-resistant metal bonding layer and its preparation method. The metal bonding layer prepared by this invention is dense and uniform, and shows no corrosion or discoloration in acidic salt spray tests. A ceramic surface layer is prepared on the metal bonding layer, and the resulting thermal barrier coating remains intact and does not peel off under combined acidic salt spray and high-temperature combustion gas thermal shock tests, effectively improving the coating's thermo-mechanical coupling performance and making it more suitable for use in aero-engines in marine environments.

This invention provides a method for regulating the eutectic reaction mechanism of DBC (Dielectric-Ceramic Composite) substrates, belonging to the field of DBC substrate fabrication technology in power electronic packaging. Addressing the problems of interfacial brittleness, intermetallic compound aggregation, low bonding strength, and poor thermal cycling reliability caused by thermal expansion coefficient mismatch and stress concentration in traditional DBC processes, this invention proposes a three-pronged approach to actively regulate the stress field: interface microstructure guidance, gradient thermal field control, and dynamic mechanical constraint. Through ten steps including substrate pretreatment, microstructure patterning, gradient thermal field construction, dynamic pressure application, in-situ stress monitoring, and segmented cooling, precise spatiotemporal control of the interface stress field is achieved, promoting the formation of a dense and uniform interface layer. Experiments show that the DBC substrate prepared by this invention exhibits over 30% improved interfacial bonding strength and over 2 times improved thermal cycling life. It also demonstrates strong process compatibility and excellent controllability, making it suitable for demanding applications such as high-end power electronic devices.