906results about How to "Improve thermal conductivity" patented technology

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

The invention discloses pressureless sintered aluminum nitride ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: ball-milling and mixing micron-sized aluminum nitride, a sintering aid, nano-sized molybdenum powder, a dispersing agent, a binder and an organic solvent to prepare slurry; and drying the slurry, granulating, forming, dumping and sintering to obtain the pressureless sintered aluminum nitride ceramic. Wherein the sintering aid is a combination of samarium fluoride and yttrium fluoride. According to the preparation method, oxygen is removed at a low temperature by virtue of strong affinity of the nanoscale molybdenum powder and oxygen, the nanoscale molybdenum powder and the sintering aid jointly play a role in liquid-phase sintering assistance at a high temperature, densified sintering is realized and grain growth is inhibited by adopting pressureless sintering at a relatively low sintering temperature, the aluminum nitride ceramic with both heat conduction and strength is obtained, and meanwhile, a low-resistance second phase is generated; the resistivity of the aluminum nitride ceramic is adjusted while the heat conduction characteristic of the aluminum nitride ceramic is improved, the electrical conductivity of the aluminum nitride material is improved, and finally the aluminum nitride ceramic with high heat conduction and bending strength and moderate resistivity is obtained to meet the use requirements of electrostatic chucks.

The invention belongs to the technical field of battery thermal management, and discloses a battery pack and a phase change material coupling liquid cooling composite thermal management system.The battery pack comprises a plurality of battery structures, each battery structure comprises a lithium battery, a fin structure, a phase change material filling area and a liquid cooling plate, and the fin structure is arranged on the periphery of the lithium battery; the liquid cooling plate is arranged on the periphery of the fin structure, a phase-change material filling area is formed between the liquid cooling plate and the fin structure, and the phase-change material filling area is filled with a phase-change material for absorbing redundant heat and generating phase change, so that the temperature fluctuation of the battery is reduced. The lithium bromide heat pump and the direct-current power supply are combined, and accurate adjustment of the temperature of the battery pack is achieved through efficient heat exchange and intelligent control. The system can be rapidly switched between a cooling mode and a heating mode, and it is ensured that the battery is always kept within the optimal temperature range in different working environments.

The invention relates to a paraffin type thermostat. The paraffin type thermostat comprises a main valve 1, a cover and seal gasket assembly 2, an upper support 3, a rubber pipe 4, a valve seat 5, a vent hole 6, a lower support 7, paraffin 8, an inductor 9, a bypass valve 10, a central rod 11 and a spring 12. The upper support, the lower support and the valve seat of the thermostat are riveted into a whole. The upper end of the central rod is fixed to the center of the upper support. The lower portion of the central rod is inserted into a central hole of the rubber pipe. The lower end of the central rod is conical. A cavity between the rubber pipe and a shell of the inductor contains the paraffin. The upper portion and the lower portion of the shell of the inductor are provided with the main valve and the bypass valve which are in linkage. The vent hole is formed in the main valve. The paraffin type thermostat is high in heat conductivity and guarantees that an engine cannot be excessively cold.

The invention relates to the technical field of castable, and discloses a silicon carbide castable which comprises main materials and auxiliary materials, the main materials comprise 30-70 parts of silicon carbide particles, 5-20 parts of micro powder which is silicon carbide micro powder, 5-20 parts of nano aluminum oxide, 5-20 parts of a phase change material and 5-20 parts of reinforced fibers, and the auxiliary materials comprise a binding agent, an additive, a heat stabilizer, a high-heat-conductivity additive and an antioxidant. The phase-change material is a metal alloy phase-change material, and the reinforcing fiber is 5-20 parts of steel fiber. The binding agent is 10-15 parts of pure calcium aluminate cement, and the additive is 3-5 parts. In the preparation process of the silicon carbide castable, the steel fiber, the metal alloy phase change material and the graphite are added, the overall performance of the silicon carbide castable can be remarkably improved, the steel fiber can remarkably improve the toughness and mechanical strength of the silicon carbide castable, the castable can be effectively prevented from being heated to deform at a high temperature, shrinkage is inhibited, and a good prevention and treatment effect on microcracks is achieved; therefore, the overall stability and durability of the pouring material are improved.

The invention relates to the field of epoxy molding compounds, and discloses an epoxy molding compound as well as a preparation method and application thereof. The epoxy molding compound contains a heat-conducting filler, epoxy resin, a curing agent, a curing accelerator, a coupling agent, a bonding modifier, a flame retardant, a coloring agent, a release agent, hydroxyl-terminated silicone oil and a dispersing wetting agent. The heat-conducting filler contains aluminum oxide, crystalline silicon dioxide powder and molten spherical silicon dioxide powder; the bonding modifier is a triazole compound or a gallic acid compound; the weight ratio of the hydroxyl-terminated silicone oil to the heat-conducting filler to the bonding modifier is (1.5-4): (700-800): 1. The epoxy molding compound has the advantages of favorable molding process property, excellent heat-conducting property and high adhesive strength, and is suitable for being used as a packaging material of a fully-packaged power module.

The invention relates to a special copper-tin alloy material and a preparation method and application thereof. The special copper-tin alloy material comprises the following elements in percentage by mass: 6.0-10.0% of Sn; 0.05 to 0.5 part of Ni; zn: < = 5.0; mn < = 0.5; 0.2 to 1.0 part of Co; pb: < = 1.0; al < = 0.25; si < = 0.05; and the balance of copper and inevitable impurities. The tensile strength of the special copper-tin alloy material ranges from 360 MPa to 560 MPa, the yield strength ranges from 200 MPa to 350 MPa, the hardness ranges from 120 HB to 180 HB, the ductility is larger than or equal to 20%, and the special copper-tin alloy material further has the advantages of abrasion resistance, friction reduction, sintering resistance, corrosion resistance and good burying property and thermal conductivity.

The invention belongs to the technical field of insulation heat dissipation coatings, and particularly relates to a magnesium alloy high-pressure-resistance surface treatment liquid and a preparation method thereof. The coating comprises the following raw materials in parts by weight: 30-40 parts of organic silicon modified waterborne epoxy resin, 9-12 parts of modified hexagonal boron nitride, 10-15 parts of modified graphene, 2-4 parts of a curing agent, 0.5-2 parts of a flatting agent, 1-2 parts of a defoaming agent and 25-50 parts of acetone. A coating formed on the surface of a magnesium alloy base material through the magnesium alloy high-pressure-resistance surface treatment liquid has high volume resistance, high breakdown voltage resistance, high corrosion resistance and high heat conductivity coefficient, and the magnesium alloy high-pressure-resistance surface treatment liquid can be applied to the field of new energy and can also be applied to the fields of aerospace, 3C electronics and the like. And the market prospect is wide.

The invention relates to the technical field of circuit board preparation, and discloses a multilayer composite circuit board preparation method and a multilayer composite circuit board, and the method comprises the steps: mixing ceramic-based powder with nano metal particles, and carrying out sintering to form a heat-conducting microporous ceramic material with a continuous heat-conducting network and a microporous structure; a plurality of heat-conducting microporous ceramic materials are laminated and then pressed into a composite substrate through vacuum hot pressing, and through heat-conducting through holes are formed in the composite substrate; the composite substrates with the heat conduction through holes are stacked, a micropore layer used for heat conduction and shock absorption is arranged between every two adjacent composite substrates, and the stacked composite substrates and the micropore layers are subjected to vacuum hot pressing to form a multi-layer structure. According to the multi-layer composite circuit board preparation method and the multi-layer composite circuit board, through the continuous heat conduction network, the micropore structure and the micropore layer, the heat conduction performance is remarkably improved, thermal stress and mechanical stress are effectively released through the elastic characteristic of the micropore structure, and the overall stability of the multi-layer composite circuit board is enhanced.

The utility model relates to the technical field of mobile phone heat dissipation films, in particular to a high-heat-conduction mobile phone middle frame graphite heat dissipation film which comprises a heat dissipation film body, the heat dissipation film body sequentially comprises matte black single-faced adhesive tape, a high-heat-conduction graphite layer and double-faced adhesive tape from top to bottom, the high-heat-conduction graphite layer is formed by stacking low-temperature carbonization layers and is 0.2 mm in thickness, and the high-heat-conduction graphite layer is formed by stacking low-temperature carbonization layers. The low-temperature carbonization layer is formed by graphene through low-temperature carbonization treatment, the heat conductivity coefficient reaches 2000-2100 W / M.K, energy consumption is reduced through low-temperature treatment, the production cost is indirectly reduced due to the low temperature requirement, the graphene is subjected to low-temperature carbonization treatment, the lattice defect density is reduced, and the stability of the heat conductivity coefficient is ensured; and meanwhile, the 0.2 mm high-thermal-conductivity graphite layer is formed by stacking the low-temperature carbonization layers, so that the occupied space of the heat dissipation film body in the middle frame is reduced.

The invention relates to the technical field of thermal insulation materials, and discloses a polyurethane foam material and a preparation method and application thereof, the polyurethane foam material is prepared from a raw material composition containing polyol, isocyanate, a catalyst, a polymer microsphere emulsion and a filler; the filler contains one or more than two of aerogel, fumed silica and polymer microspheres; the polymer microsphere emulsion is prepared by adopting a soap-free emulsion polymerization method, the preparation raw materials of the polymer microsphere emulsion comprise an oleophylic polymeric monomer and an amphiphilic polymeric monomer, and the polymer microsphere is prepared by drying the polymer microsphere emulsion. According to the invention, the polymer microsphere emulsion is used as a foaming agent, and the polymer emulsion does not contain fluorine and a traditional surfactant, so that the prepared polyurethane foam material is low in heat conductivity coefficient and density, good in heat preservation and heat insulation performance and environment-friendly, and meanwhile, the strength of polyurethane foam can also be improved; by adding the filler, the heat conductivity coefficient of the polyurethane foam material can be further reduced, and the thermal insulation performance of the polyurethane foam material is improved.

The utility model provides a battery liquid cooling module which comprises a battery module, a battery module fixing frame and a liquid cooling assembly, liquid cooling plates are respectively arranged on two opposite sides of the battery module fixing frame, and the liquid cooling plates are communicated through liquid cooling pipes to form a loop, so that circulating liquid takes away heat generated by the battery module; and the safety of the battery module is improved. The elastic insulating heat conduction pad is arranged between the liquid cooling plate and the battery module fixing frame, and the liquid cooling pipe is arranged to be the corrugated pipe with the expansion joint, so that the flowing stroke of liquid can be increased, the heat dissipation effect is improved, the corrugated pipe can absorb deformation and displacement caused by thermal expansion and cold contraction or mechanical vibration in a pipeline system, and the heat dissipation efficiency is improved. The compensation effect is achieved; by arranging the telescopic joints and the corrugated pipes, the length can be adjusted, the installation size error of the liquid cooling plates on the two sides and the distance change between the liquid cooling plates can be made up, the anti-loosening and cushioning effects are achieved, and liquid leakage caused by loosening of the clamping parts in the using process is effectively avoided.

The utility model discloses an anti-blocking spraying device for water-based paint, which belongs to the technical field of spraying machines and comprises a paint barrel, a motor is arranged on the paint barrel, a rotating shaft is arranged at the output end of the motor, a plurality of stirring rods are arranged on the rotating shaft, a scraper is arranged between the ends, far away from each other, of the stirring rods, a screen is arranged in the paint barrel, and the screen is arranged in the paint barrel. An annular heat preservation pipe is embedded in the coating barrel, water-based coating in the coating barrel is heated by arranging the annular heat preservation pipe, a motor drives a rotating shaft to rotate, the rotating shaft drives a stirring rod to stir the water-based coating, so that heat conduction of the internal coating is accelerated, and meanwhile, the stirring rod drives a scraping plate to scrape away cakes on the inner wall; water-based paint is discharged through the discharging pipe under filtering of the filter screen, cakes intercepted on the filter screen are diluted under heating of the annular heat preservation pipe and are discharged after passing through the filter screen, and the structure can effectively avoid the situations that the spraying machine is blocked and the paint cannot be sprayed out.

The invention relates to a heat-dissipating and breathable exhaust insole and a preparation method thereof. The insole is obtained by weaving a braided rope, the braided rope is obtained by twisting a plurality of polyamide fiber yarns, and a heat-conducting coating layer is arranged on the surface of at least one polyamide fiber yarn. The heat-conducting coating layer is prepared from the following raw materials in parts by weight: heat-conducting filler, methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, aminopropyl double-terminated polydimethylsiloxane, silazane, maleic anhydride graft, a diluent, an inhibitor and platinum water. The dispersity and compatibility of the heat-conducting filler are promoted through silazane and aminopropyl double-terminated polydimethylsiloxane, and then the heat-conducting filler is matched with the methyl vinyl silicone rubber, the carboxyl-terminated polycaprolactone and the maleic anhydride graft, so that a heat-conducting coating layer obtained after curing is stably adhered to the surface of the polyamide fiber yarn; and meanwhile, the insole has better moisture absorption, elasticity and heat conduction performance, so that the woven insole has better air permeability, heat dissipation performance and comfort.

The invention discloses a preparation method of a flame-retardant viscose fiber with an antibacterial function, which comprises the following steps: (1) under sufficient stirring, sequentially adding a phosphorus flame retardant, a dispersant and graphene oxide into deionized water with an alkaline pH value, and stirring and ball-milling to obtain a flame retardant dispersion liquid; (2) preparing a spinning stock solution by taking cellulose pulp as a raw material, and adding the flame retardant dispersion liquid into the spinning stock solution by adopting a pre-spinning injection method to prepare a blended spinning stock solution; (3) spinning the blended spinning stock solution in a coagulating bath, and reducing the blended spinning stock solution in an oxidation-reduction bath to obtain a formed tow; and after drafting, carrying out a post-treatment process to obtain the flame-retardant viscose fiber with the antibacterial function. The production process is optimized from multiple aspects such as selection of raw materials for preparing the flame retardant, oxidation reduction and the like, and the prepared flame-retardant viscose fiber has excellent flame retardance, good physical and mechanical properties and antibacterial properties and good wearability.

The invention discloses a radiator with microneedle columns. The radiator comprises at least one heat conducting plate and a plurality of microneedle columns, the heat conducting plate has a first surface and a second surface opposite to each other. The first surface of the heat-conducting plate is connected with the plurality of microneedle columns, and the second surface of the heat-conducting plate is used for being connected with a heat source. A small grain normal area and a plurality of large grain heat conduction channels located in the small grain normal area are formed on the heat conduction plate, and each large grain heat conduction channel is formed from the second surface of the heat conduction plate to the first surface of the heat conduction plate and is connected with each corresponding microneedle column. According to the radiator, the large-grain heat conduction channel is arranged on the heat conduction plate and connected with the microneedle columns, the large-grain heat conduction channel has a better heat conduction effect compared with a small-grain normal area, and the microneedle columns are low in heat conduction resistance and can provide a larger heat dissipation area for heat dissipation, so that heat of a heat source can be rapidly taken away, and a better heat dissipation effect is achieved.

The invention discloses a microchannel heat exchanger with bottom surface secondary textures and a preparation method thereof.The microchannel heat exchanger comprises a microchannel substrate and a cover plate attached to the microchannel substrate, the microchannel substrate is provided with a plurality of microchannels, the bottom surfaces of the microchannels are provided with secondary texture structures, and the bottom surfaces of the microchannels are provided with secondary textures. The effects of disturbing flow, damaging a fluid boundary layer and increasing the heat exchange area are achieved, and the heat transfer performance is enhanced. The microchannel substrate is made of a third-generation semiconductor material, has excellent thermal conductivity and high temperature resistance, and can stably work in a high-temperature and high-pressure environment. When the microchannel heat exchanger is manufactured, the textured grinding wheel with the multiple abrasive particles distributed on the periphery moves on the to-be-machined face in the extending direction of the to-be-machined microchannels, the multiple parallel microchannels with the bottom face secondary texture structures are machined through grinding of the textured grinding wheel, the manufacturing process is simple, cost is low, and the microchannel heat exchanger is suitable for large-scale popularization and application. And integrated, high-efficiency and low-cost preparation and forming of the third-generation semiconductor material microchannel and the inner wall surface enhanced heat transfer microstructure can be realized.

The invention relates to the technical field of adhesive tapes, and particularly discloses a double-sided adhesive tape with excellent weather resistance and a preparation method thereof.The double-sided adhesive tape comprises a first release film layer, a first adhesive layer, a base material layer, a second adhesive layer and a second release film layer, the adhesive layer is prepared from an adhesive through simple processes of coating, drying and the like, industrial production is easy, and the adhesive tape has good weather resistance. The adhesive is obtained by mixing an acrylate polymer, modified polyvinyl alcohol, a defoaming agent and a plasticizer, the acrylate polymer and the modified polyvinyl alcohol have excellent adhesive power and can be firmly adhered to various materials, the raw materials of the adhesive form a stable composite system through structural complementation, and through chemical bonding and physical effects, the adhesive can be firmly adhered to various materials. The comprehensive performance of the double-sided adhesive tape is further improved, and the double-sided adhesive tape has excellent toughness and stability, is not easy to age and fall off, and is improved in weather resistance, adhesion and tensile strength, so that the double-sided adhesive tape is more durable in the use process.

The invention belongs to the technical field of pre-hardened die steel, and particularly relates to pre-hardened die steel with a high heat conductivity coefficient and a preparation technology of the pre-hardened die steel. By optimizing the alloy component design and adopting the high-purity triple smelting process, the heat conduction performance is remarkably improved, the heat conductivity coefficient reaches 54 W / m * K, the mold steel with higher heat conductivity compared with traditional mold steel pre-hardened to 38-42 HRC is obtained, and meanwhile the excellent hardness and wear resistance are kept. The die steel not only has higher heat transfer speed and obviously shortens the injection molding cooling time, but also shows extremely high stability and durability in the use process, prolongs the service life of the die and reduces the production cost of enterprises. In addition, due to the excellent physical property, the mold can be suitable for a more complex and finer injection molding process.

The invention discloses a high-shear dynamic mixing reaction device for preparing flexible particles and a dynamic treatment process, and relates to the technical field of preparation of battery raw materials, and the process is characterized in that a flexible particle material for a battery is prepared in a compact space by adopting a pulsating stress dynamic processing method on the basis of an existing chemical formula. Performance obtained by a material formula and performance obtained by pulsating stress dynamic processing are mutually complemented to form an organic whole, the reaction device comprises a barrel, a feeding port is formed in the top of the barrel, a discharging port is formed in the bottom of the barrel, and a kneading and turning mixing mechanism is arranged, rotation of a stirring shaft is used as driving force of a sliding block, so that the material formula and the pulsating stress dynamic processing are combined, and the material formula and the pulsating stress dynamic processing are combined. The sliding block slides in the fixed sleeve in a reciprocating mode, upward and downward pressure is provided for materials in the barrel, the triangular fins are arranged on the baffles in a matched mode, the tips of the triangular fins can provide better shearing force for material particles rotating moderately, the materials are continuously kneaded and turned over and tend to be round, and carbon coating can be more uniform.

The invention discloses a light emitting device, a packaging method and an optical module. The light emitting device comprises a metal base, an insulating diversion layer, a pipe cap, a lens, a laser chip, a refrigerator assembly and an adapter assembly. The pipe cap is connected to the metal base in a covering mode to form a sealed cavity, and an insulating flow guide layer, a lens, a laser chip and a refrigerator assembly are arranged in the sealed cavity. The insulating diversion layer is connected between the metal base and the refrigerator assembly; a plurality of bismuth antimonide particles are sequentially connected to the upper surface of the insulating diversion layer; the cold surface substrate is connected to the upper surfaces of the bismuth antimonide particles; the upper surface of the cold face substrate is connected with a heat transfer conductive piece which is connected with the first substrate and the second substrate. The thermistor is arranged on the first substrate; the lens is arranged on the heat-transfer conductive part; the laser chip is arranged on the second substrate; the adapter assembly is connected to the outer side of the pipe cap. The heat dissipation efficiency is effectively improved, and the service life is prolonged.

The present application relates to the technical field of thermally conductive insulating plastics, in particular to a graphene-modified high thermal conductive plastic and a preparation method thereof. A graphene-modified high thermal conductive plastic is mainly prepared from a nylon matrix resin, a graphene-modified polyaniline resin, a surface-modified aramid fiber, and a nano-high thermal conductive insulating filler; the mass of the surface-modified aramid fiber accounts for 6-8% of the total mass of the high thermal conductive plastic; the mass of the nano-high thermal conductive insulating filler accounts for 24-28% of the total mass of the high thermal conductive plastic; the mass of the graphene-modified polyaniline resin accounts for 28-36% of the total mass of the high thermal conductive plastic; the nylon matrix resin is composed of PA66 and PA612 in a mass ratio of (6-8): (2-4). The high thermal conductive plastic prepared in the present application not only has good thermal conductivity and heat dissipation, but also has good mechanical properties, flame retardancy and anti-electrical breakdown insulation safety, and is suitable for the field of shell materials for thermal runaway protection of power batteries.

The invention discloses a self-repairing composite material for a new energy vehicle tire, a preparation method of the self-repairing composite material and the tire. The self-repairing composite material is formed by connecting a first self-repairing layer and a second self-repairing layer. The first self-repairing layer is prepared from the following components in parts by weight: 80-120 parts of a dynamic vulcanized rubber system, 18-35 parts of a functional filler system and 3-8 parts of a vulcanization accelerator; the second self-repairing layer is prepared from the following components in parts by weight: 100 to 110 parts of thermoplastic polyurethane elastomer, 30 to 40 parts of repairing microcapsule and 10 to 15 parts of modified polyimide fiber; the repairing microcapsule is composed of a core material and a capsule wall, and the core material is an epoxy resin mixture or a curing agent mixture. By arranging the double-layer self-repairing composite material, the requirement for rapid repairing when the new energy vehicle tire is damaged under the complex road condition can be met, good durability is achieved, and the safety of a driver and passengers is effectively protected.

The utility model relates to the technical field of dies, and discloses a zinc alloy auto spare part forming die. The zinc alloy auto spare part forming die comprises a movable plate, a limiting column is fixedly installed on the upper portion of the movable plate, a bottom die is fixedly installed on the upper portion of the movable plate, a supporting frame is fixedly installed on the lower portion of the movable plate, and a connecting block is arranged on the lower portion of the supporting frame. The connecting frame surrounds the die-casting space between the bearing plate and the bottom die, in the die-casting process, cooling liquid can be guided into a copper pipe in the connecting frame through the connecting pipe, heat absorbed by the connecting frame is taken away through the cooling liquid, temperature difference is formed on the contact face between the bearing plate and a casting, and the casting quality is improved. Therefore, the heat of the casting can be quickly conducted to the bearing plate and is finally taken away from the mold through the cooling liquid in the copper pipe, the cooling forming time of the casting can be shortened in the mode, and the production efficiency is improved.

The invention discloses a temperature-adjusting antibacterial microcapsule material and a preparation method and application thereof.The preparation method comprises the steps that S1, paraffin and a microcapsule wall material precursor are mixed, heated and stirred, and an oil phase solution is formed; s2, dispersing an emulsifier in a water-phase solvent, heating and stirring to form a water-phase solution; s3, uniformly mixing the oil-phase solution with the water-phase solution, and performing ultrasonic emulsification to obtain a homogeneous oil-in-water emulsion; s4, dropwise adding alkali liquor into the oil-in-water emulsion, initiating hydrolysis and condensation polymerization of the microcapsule wall material precursor, and performing suction filtration, water washing and drying on the obtained product to obtain microcapsule powder; and S5, adding the microcapsule powder into a metal salt solution, carrying out a reaction under heating and stirring conditions, and carrying out suction filtration, water washing and drying on the obtained product to obtain the temperature-adjusting antibacterial microcapsule material. The polysiloxane coated paraffin phase change energy storage microcapsule is prepared by a sol-gel method, and hydroxyl on a wall material is complexed with metal ions, so that the thermal conductivity of the microcapsule is improved, and meanwhile, the antibacterial effect is also enhanced.

The invention provides a lamp surface composite coating and a preparation method thereof as well as an LED module and a preparation method thereof. The lamp surface composite coating comprises a coating mixture and a volatile solvent, the coating mixture comprises an ink mixture and modified inorganic matte powder in a mass ratio of (9-12): (0.5-1.2); wherein the ink mixture is prepared from the following components in parts by mass: 50 to 60 parts of epoxy resin, 25 to 35 parts of filler, 15 to 20 parts of organic solvent, 1 to 5 parts of flatting agent and 1 to 5 parts of dispersing agent; the filler comprises at least one of nano carbon spheres and modified nano carbon spheres; the modified inorganic matt powder comprises inorganic matt powder and a surface treating agent, wherein the inorganic matt powder comprises at least one of gas-phase SiO2, micronized wax, silica powder and talcum powder. The lamp surface composite coating disclosed by the invention can have good heat dissipation performance, and when the lamp surface composite coating is applied to an LED module, the heat dissipation performance and the optical performance in an LED display screen and the adhesive force between lamp beads and a lamp panel can be improved at the same time, so that the display effect of an LED is improved.

The invention provides a liquid cooling system and a battery pack, the liquid cooling system at least comprises a liquid cooling assembly, the liquid cooling assembly is used for carrying out liquid cooling on a battery cell group, the liquid cooling assembly comprises a liquid cooling plate and a plastic current collecting piece, the liquid cooling plate is arranged on the side surface of the battery cell group, the liquid cooling plate is hollow, and a liquid cooling flow channel is formed in the liquid cooling plate; a liquid inlet communicated with one end of the liquid cooling flow channel and a liquid outlet communicated with the other end of the liquid cooling flow channel are formed in the liquid cooling plate; the plastic flow collecting piece is formed on the liquid cooling plate in an injection molding mode, the plastic flow collecting piece and the liquid cooling plate are integrally arranged, the plastic flow collecting piece comprises a liquid inlet flow channel and a liquid outlet flow channel, the liquid inlet flow channel is used for communicating a liquid inlet and a liquid inlet pipeline of the liquid cooling plate, and the liquid outlet flow channel is used for communicating a liquid outlet and a liquid outlet pipeline of the liquid cooling plate.

The utility model discloses a defoaming agent testing device for defoaming performance detection. The defoaming agent testing device comprises a supporting seat, an inner driving groove is formed in the supporting seat, a multi-axis linkage mechanism is arranged in the supporting seat, a detection box is installed at the top end of the multi-axis linkage mechanism, and a temperature rising assembly is arranged on the outer side of the detection box. The driving motor is used for driving the driving shaft and the pinion to rotate, the pinion is meshed with the fluted disc, synchronous rotation of the detection box can be achieved, detection liquid in the pinion is in contact with a defoaming agent to be preliminarily mixed, and in the process, the driving wheel, the driving belt and the driven wheel are matched with one another, so that the defoaming agent can be accurately detected. The central rotating shaft can be driven to rotate synchronously, so that the contact between the detection liquid in the detection box and the defoaming agent can be stirred synchronously, the sufficient contact between the defoaming agent and the detection liquid can be ensured, and the detection accuracy can be ensured.

According to the silicon carbide / diamond multi-layer composite film and the preparation method thereof, a polycrystalline silicon carbide matrix in the multi-layer composite film is a bottom layer, and the multi-layer composite film has high strength, high rigidity, high heat conductivity and oxidation resistance; the components of the gradient SiC-C transition layer gradually change from pure SiC to rich C-SiC and then to diamond-like carbon, and the gradient SiC-C transition layer is used for slowly releasing thermal stress and enhancing binding force; the nanocrystalline diamond is used as the top layer and has high hardness, low friction coefficient, particle scouring resistance and high infrared transmittance; the silicon carbide / diamond multi-layer composite film is obtained through a chemical vapor deposition method, the process is mature, and the silicon carbide / diamond multi-layer composite film has good heat conduction performance and infrared transmittance and is suitable for infrared guidance systems with extremely severe working environments, such as optical materials of fairings, optical windows and the like.

A switch case disclosed by the present invention comprises a case body mechanism, a modular mechanism and a heat dissipation mechanism, the heat dissipation mechanism is inserted into the case body mechanism, the modular mechanism is inserted into the case body mechanism, and the case body mechanism comprises a machine body unit and a cover plate unit. And the cover plate unit is in threaded connection with the top of the machine body unit. By adopting the modular design, when the network scale is expanded or new functions need to be added, only corresponding modules need to be added, and the whole case does not need to be replaced, so that the extension and upgrade cost is greatly reduced, the extension and upgrade time is greatly shortened, extension and upgrade are easy, and the heat dissipation efficiency is improved by optimizing the design of a heat dissipation system. According to the heat dissipation system, the operation temperature of the switch can be effectively reduced, so that the energy consumption of the heat dissipation fan is reduced, meanwhile, the optimal design of the heat dissipation system also can avoid potential safety hazards caused by overheating, and the side surface is matched with the top heat dissipation design, so that air flow can be formed, and heat can be rapidly extracted.