347results about How to "Improve thermal performance" patented technology

The invention discloses light gray low-emissivity coated glass for near-zero energy consumption buildings and a preparation method thereof, the light gray low-emissivity coated glass comprises a glass substrate and a composite metal film layer laminated on the glass substrate, and is coated glass with three metal silver film layers. According to the invention, one of the multiple composite metal film layers on the common colorless transparent float glass substrate reflects and interferes with light, so that the coated glass is light gray in the sun and has good decoration and energy-saving effects; the hollow glass is high in visible light transmittance, low in outdoor visible light reflectivity, low in solar energy transmittance and high in solar energy reflectivity, and can be made into hollow glass to achieve better energy-saving effects such as light control, heat insulation and the like, so that a building is closer to the nature and is fused with the nature.

The invention provides a glass fiber reinforced nylon composite material and a preparation method thereof, and belongs to the technical field of high polymer materials, the glass fiber reinforced nylon composite material comprises the following components by weight: 75-82 parts of nylon 6, 14-16 parts of modified glass fiber, 2-3 parts of polyethylene glycol, 0.4-0.7 part of an antioxidant, 0.6-1 part of a lubricant and 0.6-1 part of an antistatic agent; the modified glass fibers are prepared by treating glass fibers with a silane coupling agent and then treating the glass fibers with a dopamine-boron nitride surface modifier. The excellent tensile strength of the prepared composite material is guaranteed, and meanwhile, the reduction of the elongation at break is effectively avoided, so that the fatigue resistance of the composite material is guaranteed, and the service life is further prolonged.

The invention discloses a low-loss resin composition, which is prepared from the following main components in parts by weight: 10 to 90 parts of acenaphthylene-p-vinylbiphenyl copolymer, 10 to 70 parts of cross-linking agent, 20 to 60 parts of elastomer, 0.1 to 3 parts of initiator and 10 to 90 parts of filler. The acenaphthylene-p-vinylbiphenyl copolymer is obtained by pre-polymerizing acenaphthylene and divinylbiphenyl, the acenaphthylene monomer residue is less, the acenaphthylene monomer is difficult to volatilize in a resin system, implosion caused by too fast curing reaction of the resin system is prevented while good reaction activity is maintained, and a subsequent curing product is high in crosslinking density and good in heat resistance; a machining window is wide, and subsequent production and machining are facilitated; and an acenaphthylene structure has high symmetry and rigidity and does not contain elements such as oxygen, sulfur and nitrogen, so that the resin composition has excellent dielectric properties and thermal properties and a low thermal expansion coefficient, and an elastomer as a cross-linking curing matrix material can provide the characteristics of low dielectric constant, low dielectric loss, low water absorption and the like.

The invention belongs to the field of tunnel water plugging grouting materials, and particularly discloses a heat-insulating shrinkage-reducing type water plugging grouting material suitable for a high-temperature hot water tunnel and a preparation method of the heat-insulating shrinkage-reducing type water plugging grouting material. The water plugging and grouting material for the high-temperature hot water tunnel is mainly formed by mixing a multi-element gel composite material component, a heat insulation material component, a reinforcing, toughening and shrinkage reducing component, a water dispersion resisting component, a special admixture for the high-temperature hot water grouting tunnel and the like. The water plugging grouting material for the high-temperature hot water tunnel is suitable for water leakage in the high-temperature hot water tunnel, and has the advantages of good working performance and long-term durability, high material strength, low water permeability coefficient, environmental protection and the like. The setting time of the admixture can be regulated and controlled within 30-5 minutes through the admixture special for the high-temperature hot water tunnel grouting material, and the admixture has good operability so as to meet the construction requirements of actual engineering. Under the synergistic effect of materials with a certain proportioning ratio, the water plugging grouting material has better mechanical properties and durability than a traditional water plugging grouting material, and also has good shrinkage resistance and heat insulation performance. The grouting material disclosed by the invention is good in groutability, easy to inject into tunnel surrounding rock cracks, high in stability, relatively good in later strength and durability, and particularly suitable for water plugging construction of high-temperature hot water tunnels.

The invention relates to the technical field of polyimide films, in particular to a high-transmittance colorless polyimide film and a preparation method thereof. The polyimide film is prepared from a mixture comprising dianhydride and diamine, and the molar ratio of dianhydride to diamine monomer is (0.9-1.1): 1. The polyimide film prepared by the invention has excellent light transmittance, tensile property and thermal stability, also has good processability, and can be widely applied to the field of flexible photoelectricity, especially flexible display.

The invention discloses negative photosensitive polyamic acid, photosensitive resin and a preparation method and application of the negative photosensitive polyamic acid and the photosensitive resin. The negative photosensitive polyamic acid is prepared from diamine and a dianhydride compound as monomers through end capping of anhydride containing a norbornene group; the photosensitive resin is formed by mixing negative photosensitive polyamide acid, polythiol and a photoinitiator, and is applied to preparation of photoresist, photosensitive packaging adhesive, photocuring adhesive and the like; the photosensitive resin is subjected to ultraviolet curing and gradient imidization to prepare negative photosensitive polyimide cross-linked through polythiol, and the negative photosensitive polyimide has good thermal performance and photosensitive performance; the photosensitive resin is used for preparing photoresist and is a solution-developed negative photosensitive polyimide system, alkenyl of a polyamide acid terminal chain and sulfydryl of polythiol are subjected to a click reaction to construct a cross-linking point, the solubility of polyamide acid in an exposure area in an alkaline solution is reduced, a negative pattern is obtained, the preparation method is simple, and the cost is low. The pattern resolution and sensitivity are high, and the method is expected to be well applied to the fields of optics and electronics.

The invention relates to the technical field of preparation of phase-change materials, in particular to a steel slag-based porous ceramic composite phase-change material and a preparation method thereof.According to the preparation process, a sacrificial template method and a foaming agent pore-forming method are combined, waste polyurethane foam and waste wood pulp sponge are used as templates, industrial solid wastes (steel slag, fly ash and rice hull ash) are used as raw materials, and the steel slag-based porous ceramic composite phase-change material is prepared. The steel slag-based porous ceramic is prepared. The steel slag-based porous ceramic composite phase change material is prepared by using the prepared steel slag-based porous ceramic as a carrier vacuum adsorption phase change material. According to the invention, resource utilization of wastes is promoted, and environmental pollution caused by industrial solid wastes, biomass wastes and plastic wastes is reduced. The steel slag-based porous ceramic with abundant pore structures and the steel slag-based porous ceramic composite phase change material with good thermal performance and thermal cycle performance are prepared by adjusting the proportion of the raw materials, the porosity of the porous template and the impregnation vacuum degree. The preparation method is simple and suitable for large-scale production.

The invention provides a design method of a variable-size variable-density lattice structure wing with optimized heat dissipation load, and relates to the technical field of aerospace engineering, and the design method comprises the following steps: S10: carrying out variable cross-section design on a D-type unit to obtain a variable cross-section D-type unit, taking the variable cross-section D-type unit as a lattice unit configuration, and filling the wing to form a skin lattice structure; the skin lattice structure of the wing comprises a skin and a lattice filling area; s20, cell element variable-size design is adopted for the dot matrix units, and variable-size dot matrix units are constructed; s30, according to the stress field of the wing, cell element variable-density design is adopted for the variable-size dot matrix units, and variable-size variable-density dot matrix units are constructed; and S40, establishing a wing configuration. The variable-cross-section D-type unit is used as a dot matrix unit configuration, deep coupling of integrated design of heat dissipation and bearing performance is achieved through variable-size and variable-density design, application scenes are flexibly adjusted, and complex working condition requirements are met.

The invention relates to a nanocellulose-silicon-based hybrid material, preparation and application thereof and a thermoplastic polymer composite material. Comprising the following steps: combining nano SiO2 containing hydrophilic hydroxyl on the surface with hydroxyl on the surface of cellulose, then adding a silane coupling agent, reacting and hydrolyzing the silane coupling agent to obtain silanol, combining the silanol with hydroxyl on the surface of nano SiO2 particles and hydroxyl on the surface of nano cellulose, drying, dehydrating the silanol into siloxane, and grafting the siloxane on the surface of nano cellulose / SiO2, thereby obtaining the nano SiO2 / silanol composite material. Grinding to obtain a nanocellulose-silicon-based hybrid material, blending the obtained hybrid material with a thermoplastic polymer matrix, and preparing a corresponding product through a thermal forming process. The process is environment-friendly, the method is simple, the product is easy to form, operation and control are simple and convenient, and industrial production is facilitated; the prepared hybrid material has good stability, dispersibility and polymer matrix compatibility, and shows excellent mechanical properties and thermal properties when applied to thermoplastic polymers.

The invention discloses a method for improving the comprehensive performance of a PLA / PBS blended material by using a compatilizer, and belongs to a preparation method of a biodegradable material. The method comprises the following steps: adding a PLA / PBS blending system into a twin-screw extruder according to a certain mass ratio for melt blending, and adding a compatilizer, an antioxidant and an initiator to improve the compatibility between PLA and PBS. Epoxy groups in the compatilizer can chemically react with hydroxyl groups in PLA and PBS to form chemical bonding, so that the mechanical property and the optical property of the material are remarkably improved. The prepared composite material has excellent mechanical, processing and optical properties, and the preparation process is simple and convenient to operate. The innovative technology is very suitable for large-scale industrial production, has remarkable economic benefits and wide application prospects, and provides a new technical route for promoting the development of the field of biodegradable materials.

The invention provides a PBO (poly (p-phenylene benzobisoxazole)) coated diaphragm for a lithium ion battery and a preparation method of the PBO coated diaphragm. The PBO coated diaphragm comprises a lithium ion battery diaphragm substrate and a PBO (poly (p-phenylene benzobisoxazole)) pulp layer coated on the substrate. According to the coating layer, the thermal stability, the mechanical strength and the chemical stability of the lithium ion battery diaphragm can be remarkably improved, so that the comprehensive performance and the safety of a lithium ion battery are improved, and the coating method is simple, easy to implement, low in cost and suitable for large-scale production.

The utility model provides a broken-line-shaped component type high-performance glass curtain wall which comprises a plurality of first wall bodies and second wall bodies arranged between every two adjacent first wall bodies, and each first wall body comprises a first stand column, a second stand column and an inner plate arranged between the first stand column and the second stand column; the second wall body comprises at least one cross beam and at least one glass panel; the glass panel is fixedly connected with the first wall body and the cross beam in a matched mode. The first wall body is assembled in a prefabrication mode in a factory, so that the assembly precision can be guaranteed, the stress strength of the first wall body is improved, and the on-site construction progress can be accelerated; besides, the cross beam of the curtain wall adopts a closed cavity design, is connected with the prefabricated first wall body through the insertion core on site, and can form a triangular prism truss structure together with the first wall body and the glass panel, so that the structural system can still keep higher mounting precision under the condition of meeting the requirements of larger span floor height and horizontal large division stress.

The invention discloses a high-strength ceramic insulator processing method, which is characterized in that diatomite and silicon powder are added into a blank of an insulator, the diatomite has good adiabaticity, the service life of the ceramic insulator can be prolonged, the performance of the ceramic insulator can be improved, and meanwhile, pores of the diatomite can be filled with silicon powder particles so as to reduce the porosity of the diatomite; on the other hand, the surface of the green body is subjected to ozone treatment during glazing, so that a glassy-state-like # imgabs0 # film and more hydrophilic groups # imgabs1 # can be generated on the surface of the green body to facilitate glazing, the bonding strength of the glaze and the green body is improved, and the strength of the insulator is improved; meanwhile, soluble impurities in kieselguhr in the glaze are removed through weak acidity of boric acid, boric oxide is generated through thermal decomposition reaction of boric acid, and boric oxide can react with aluminum oxide in the glaze to generate aluminum borate whiskers in the firing process after a green body is glazed; the aluminum borate whisker can be used as a reinforcing agent in the firing process of the insulator, so that the strength of the insulator is further improved.

The invention discloses a fluoride modified liquid metal medium thermite and a preparation method thereof, and belongs to the technical field of thermite preparation. Liquid metal is prepared by using Gallinstan eutectic; the method comprises the following steps: synthesizing aluminum powder and liquid metal by adopting a physical mixing and ultrasonic treatment method to obtain liquid metal modified aluminum; the preparation method comprises the following steps: adding FeCl3. 6H2O into a perfluorooctanoic acid aqueous solution, stirring and mixing, carrying out hydrothermal reaction, and washing the obtained product to obtain Fe (PFO) 3; the method comprises the following steps: mixing liquid metal modified aluminum with iron perfluorooctanoate, and carrying out ultrasonic treatment to obtain Fe (PFO) 3-coated LM-Al; fe (PFO) 3 (at) LM-Al and ferric oxide are added into absolute ethyl alcohol for ultrasonic stirring and mixing, and Fe (PFO) 3 (at) LM-Al (at) Fe2O3 is prepared. By the adoption of the method, the high-temperature thermal oxidation reaction temperature of the aluminum powder is increased to be before the melting point of 660 DEG C, and the breakthrough progress of the aluminum powder thermal mass transfer process is achieved.

The invention relates to an efficient heat shrink tube preparation method and equipment thereof. FEP granules and modified CaSi2 are fed into an extruder to be extruded, and an FEP pipe is obtained; placing the FEP pipe in an expansion box, taking out the FEP pipe after the pressure in the FEP pipe and the pressure in the expansion box reach expansion pressure and are stabilized for a period of time and the pressure and the temperature in the expansion box and the FEP pipe are reduced to normal pressure and low-temperature oil temperature, and respectively washing the inside and the outside of the FEP pipe with water until the product meets the use requirement; the modified CaSi2 is prepared by the following steps: reacting CaSi2 powder, DMF (Dimethyl Formamide), isocyanatopropyltriethoxysilane, 4-hydroxyphenylboronic acid pinacol ester, lanthanum 5-hydroxyisophthalate, organic tin and methylbenzene, washing, carrying out suction filtration, and drying, thereby obtaining the modified CaSi2. The lanthanum 5-hydroxyisophthalate disclosed by the invention is prepared from 5-hydroxyisophthalic acid and lanthanum nitrate; the heat-shrinkable tube prepared by the invention has a relatively high heat shrinkage ratio.

The invention provides glass and a preparation method thereof, glass fiber and an electronic device. The glass is prepared from the following components in percentage by mass: 56 percent to 64 percent of SiO2, 4 percent to 9 percent of B2O3, 0.1 percent to 1 percent of P2O5, 10 percent to 17 percent of Al2O3, 2 percent to 7 percent of Na2O, 4 percent to 8 percent of MgO, 4 percent to 10 percent of CaO, 0.1 percent to 1.5 percent of TiO2 and 0.01 percent to 1 percent of Y2O3. According to the present invention, the types and the mass percentages of the glass components are regulated and controlled, the components cooperate with each other and have the synergistic effect, and the stability of the frame-shaped structure in the glass structure is improved so as to improve the dielectric property and the thermal property of the glass product; further, the requirements of the fifth-generation wireless communication technology on the glass substrate can be met.

The invention discloses a method for preparing a high-performance closed-cell perlite material by a chemical method, the prepared high-performance closed-cell perlite material is mainly used in the field of buildings, and the method comprises the following steps: S1, expanding; s2, film covering; s3, dispersing; s4, grading; according to the invention, a layer of silica sol film is formed on the surface of the closed-cell perlite, the film layer not only significantly reduces the volume shrinkage of the closed-cell perlite in the subsequent slurry stirring process, but also effectively hinders the expansion of cracks in the perlite and greatly reduces the cracking risk, and meanwhile, the heat conductivity coefficient of the material is also reduced by film coating treatment, so that the thermal conductivity of the material is improved. The thermal insulation performance is obviously improved; according to the drying furnace, through cooperative use of the drying mechanism and the adjusting mechanism, the air outlet pipe can be driven to swing up and down in a reciprocating mode, so that the air blowing angle of the air outlet pipe is adjusted according to use requirements, hot air can be blown to different areas in the furnace body, the air blowing range is widened, and the perlite drying effect is improved.

The invention relates to the technical field of PE wrapping films, in particular to a multi-layer co-extrusion PE stretching wrapping film which overcomes the defects in the prior art and comprises the following components: polyethylene, polyhedral oligomeric silsesquioxane, ethylene-vinyl acetate, bonding resin, polypropylene, nano zirconium oxide particles, polyether-ether-ketone, an antistatic agent, a slip agent and an ultraviolet absorbent. According to the invention, novel nano materials such as nano zirconium oxide and polyhedral oligomeric silsesquioxane are introduced, and a material formula and a preparation process are optimized, so that the multi-layer co-extrusion PE stretching and wrapping film with higher wear resistance, high temperature resistance, chemical resistance and mechanical strength is developed, and increasingly complicated and diversified market requirements are met.

The invention relates to a waterproof anti-cracking composite coiled material and a preparation method and application thereof. The composite coiled material comprises a paper base layer and a waterproof coating coated on the surface of the paper base layer, and the waterproof coating is formed by curing a waterproof finishing agent. The waterproof finishing agent comprises the following raw materials in parts by mass: 60-75 parts of epoxy resin, 2-5 parts of a hardening agent, 5-20 parts of rubber particles, 8-15 parts of modified bacterial cellulose, 20-30 parts of polylactic acid, 10-20 parts of polyethylene glycol and 5-10 parts of a silane coupling agent. The composite coiled material can serve as a decorative material to be attached to the surface of furniture, and due to the good flexibility, crack resistance and tensile effect, the technical problems that when traditional furniture decorative paper is attached, corners are prone to being bent and broken, and the waterproof performance is poor are solved.

The invention relates to the field of oil and gas gathering and transportation, in particular to a drag reducer for oil and gas gathering and transportation and a preparation method of the drag reducer, and solves the problems that poly-alpha-olefin drag reducers are insufficient in shear resistance, and nano drag reducers are unstable in drag reduction effect and poor in drag reduction effect. Dispersing graphene oxide in an alkaline solution, dropwise adding the dispersed graphene oxide into deionized water containing carboxymethyl cellulose, adding a catalyst, and carrying out a heating reaction to obtain a miniature elastomer; the preparation method comprises the following steps: preparing a micro elastomer, oxidizing the micro elastomer to form alkali liquor containing an activated nano material, modifying the activated nano material by using a polyphenol compound, and modifying a long-chain hydrophobic structure to obtain the hydrophobic drag reducer. The oil gas drag reducer prepared by compounding the graphene oxide and the cellulose and constructing a plurality of hydrophobic long chains is excellent in drag reduction effect and high in shear resistance.

The invention belongs to the field of polyester materials, and relates to a high-temperature-resistant polyarylester fluorescent film and a preparation method thereof. The preparation method comprises the following steps: carrying out esterification reaction on a reaction monomer under the conditions of a catalyst and a stabilizer, firstly mixing and stirring bisphenol fluorene, 18-crown ether-6 and deionized water to prepare a precursor solution, then gradually dropwise adding part of a paraphthaloyl chloride solution, continuously reacting for 3 hours under an alkaline condition, then adding an aqueous solution of bisphenol A into the solution, continuously reacting for 3 hours under an alkaline condition, and carrying out vacuum drying, so as to obtain the bisphenol fluorene / 18-crown ether-6 composite material. And continuously dropwise adding the residual paraphthaloyl chloride solution, reacting for 5 hours, adjusting the pH value of the mixed solution to be acidic, finally crushing, suction-filtering, precipitating and drying the product, and dissolving the product in an N-methyl pyrrolidone solution to prepare the film. The film prepared by the method has better high-temperature resistance, can emit blue fluorescence under the excitation of ultraviolet light, and can be used as a new optical material to be applied to the anti-counterfeiting field.

The invention relates to modified epoxy resin and a preparation method thereof.The preparation method comprises the steps that S1, nano aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction in an organic solvent, then a reaction product is sequentially subjected to centrifugal separation, filtering, washing and drying, and a precursor AlN-coated SiO2 is obtained; s2, the precursor AlN-coated SiO2 and epoxy resin are mixed and then heated to a molten state, heat preservation is conducted in the molten state, modified epoxy resin is obtained, and the modified epoxy resin is used as a heat conduction epoxy plastic packaging material for semiconductor structure packaging. Nanometer aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction to obtain a precursor AlN-coated SiO2, and the precursor AlN-coated SiO2 is doped with epoxy resin, so that the heat-conducting property of the modified epoxy resin is remarkably enhanced, the modified epoxy resin can provide an additional heat dissipation way when being applied to semiconductor structure packaging, the requirement of electronic packaging for a high-heat-conducting packaging material is met, and the service life of the high-heat-conducting packaging material is prolonged. Meanwhile, the modified epoxy resin has good thermal property and mechanical property.

The invention relates to the technical field of organic polymer materials and the technical field of lithium batteries, in particular to polyimide and a preparation method and application thereof.The preparation method of the polyimide comprises the steps that in the inert gas atmosphere, a first solvent, a first monomer and a second monomer are subjected to a mixed reaction, pyridine and acetic anhydride are added, a reflux reaction is conducted, cooling is conducted, and the polyimide is obtained. And adding a second solvent, stirring, carrying out suction filtration, and drying. The polyimide is resistant to high temperature, the decomposition temperature is 500 DEG C or above, and the polyimide has good thermal performance, meanwhile, when the polyimide is applied to preparation of the lithium ion battery diaphragm in the form of nanofibers and nanoparticles, due to the fact that the polyimide has cohesiveness, the problem that the cohesiveness of a binder fails is solved, and due to the fact that the polyimide contains ether bonds and has higher affinity with electrolyte, the service life of the polyimide is prolonged. The wettability of the battery is improved; meanwhile, the polyimide is simple in preparation method, suitable for mass production and convenient for commercialized popularization.

The utility model relates to the technical field of boilers, in particular to a boiler shell boiler with smoke tubes welded with a boiler shell, which comprises a boiler body, a boiler furnace arranged on the lower portion inside the boiler body, a corrugated structure of the outer wall of the boiler furnace, a reversal chamber connected to one end of the boiler furnace, and a plurality of threaded smoke tubes arranged on the upper portion inside the boiler body. A front tube plate and a rear tube plate are installed at one end of the threaded smoke tube, the two ends of the threaded smoke tube are welded to the front tube plate and the rear tube plate respectively, and diagonal draw bars are installed in the boiler body and close to the upper portions of the two ends. According to the boiler shell boiler with the smoke pipe and the boiler shell welded, through structural optimization and innovative design of the boiler furnace and the smoke pipe, the heat efficiency and performance of the boiler shell boiler are remarkably improved. The furnace pipe of the corrugated structure increases the heating area and promotes sufficient combustion of fuel, and therefore the heat energy utilization rate is improved. Meanwhile, due to the design of the threaded smoke pipes, the smoke generates a strong vortex effect in the flowing process, heat exchange between the smoke and the inner wall of the boiler shell is enhanced, and the heat energy transfer effect is further improved.

The utility model provides a ventilation type photovoltaic curtain wall with a heat preservation function, a cavity for air circulation is formed between a curtain wall back plate and a photovoltaic panel, the ventilation type photovoltaic curtain wall comprises an upper electric control flow guide assembly and a lower electric control flow guide assembly, an upper horizontal line groove and a lower horizontal line groove are fixedly arranged at the upper end and the lower end of a photovoltaic panel frame respectively, and an upper opening and a lower opening of the cavity are provided with an upper vertical line groove and a lower vertical line groove respectively. The upper electric control flow guide assembly is fixed to a curtain wall main keel at the position of an upper opening of the cavity and makes contact with the curtain wall back plate and the upper horizontal line groove so as to open and block the upper opening of the cavity, and the lower electric control flow guide piece is arranged in the lower vertical line groove and used for blocking and opening the lower opening of the cavity. According to the utility model, the temperature of the photovoltaic panel can be reduced through heat dissipation in hot weather, and the power generation efficiency of the photovoltaic panel is improved. In cold weather, heat generated by the photovoltaic panel is stored, thermal performance of a building is enhanced, energy consumption of the building is reduced, and the photovoltaic panel has the advantages of energy conservation, simple appearance and improvement of weather resistance and durability of the building. The device is suitable for cold and severe cold climate areas.

The invention provides a diamond thick film and a preparation method thereof, and the preparation method comprises the following steps: (1) electrifying and heating the surface of a substrate by using a hot filament, introducing a methane and hydrogen mixed gas with the methane volume content of 2-8%, and depositing diamond on the surface of the substrate; (2) after the single deposition thickness of the diamond reaches 50-150 microns, stopping introducing the methane, and maintaining for 0.5-20 hours in a hydrogen atmosphere; (3) introducing a methane and hydrogen mixed gas with the methane volume content of 2-8%, and continuously depositing the diamond; (4) after the single deposition thickness of the diamond reaches 50-150 microns, stopping introducing the methane, and maintaining for 0.5-20 hours in the hydrogen atmosphere; and (5) according to the required thickness of the diamond thick film, the step (3) and the step (4) are repeated, the diamond thick film is obtained, and the thickness is 600-2500 microns. According to the method, the diamond phase content in the diamond thick film is increased, and the mechanical and thermal properties of the diamond thick film are improved.

The invention relates to the technical field of photoelectric devices, in particular to a perovskite thin film and a preparation method thereof, a perovskite precursor solution, a photoelectric device and an electric device. According to the perovskite thin film provided by the invention, the perovskite thin film comprises an ABX3 type perovskite material and a cross-linked polymer, and the cross-linked polymer is a polymer obtained by cross-linking an ether-containing amide monomer. The cross-linked polymer contained in the perovskite thin film provided by the invention can effectively passivate surface defects of the perovskite thin film so as to improve thermal stability and photoelectric properties of the perovskite thin film.

The invention relates to a preparation process of a modified PPC biodegradable plastic, and belongs to the technical field of bioplastics, the modified PPC biodegradable plastic comprises the following raw materials: 60-80 parts of PPC resin, 20-30 parts of a modified reinforcing material, 0.5-1 part of an antioxidant, 0.4-0.6 part of a plasticizer and 0.5-0.8 part of a lubricant; according to the technical scheme, after cellulose is grafted with amino silane, the amino silane is combined with the aldehyde group compound to obtain the reinforcing material, and the amino silane is combined with the aldehyde group compound to form a Schiff base structure; combining epoxidized castor oil with a reinforcing material to obtain a modified reinforcing material; the modified PPC biodegradable plastic is obtained by mixing the PPC resin, the modified reinforcing material, the antioxidant, the plasticizer and the lubricant, carrying out melt blending and then carrying out extrusion granulation, so that the thermal property, the mechanical property and the flame retardant property of the PPC biodegradable plastic are totally improved, the comprehensive performance of the PPC biodegradable plastic is improved, and the pollution to the environment is reduced.

The unmanned aerial vehicle comprises a fuselage and a pair of wings symmetrically arranged on the two sides of the fuselage, an engine is arranged on the fuselage, and a water jacket is arranged on the engine. The pair of wing radiators are respectively and integrally formed on the pair of wings, at least one of the upper side surface and the lower side surface of each wing is provided with a radiating surface of the wing radiator, the radiating surface is exposed in the outside air, and the pair of wing radiators are communicated with the water jacket through circulating pipelines; a driving pump is arranged on the circulating pipeline, and cooling fluid flows between the pair of wing radiators and the water jacket in a closed circulating manner under the action of the driving pump. The wing radiator provided by the invention does not need to open an air entraining port outside an aircraft, directly utilizes airflow outside the aircraft to radiate, can greatly reduce the aerodynamic resistance of the whole aircraft, improves the cruising ability of the aircraft, and reduces the oil consumption.

The invention relates to the technical field of copper-clad plates, in particular to a benzoxazine-epoxy resin glue solution, a copper-clad plate and a preparation method. The benzoxazine-epoxy resin glue solution is prepared from the following components in parts by weight: 80 to 120 parts of modified flame-retardant epoxy resin, 20 to 40 parts of aromatic main chain benzoxazine, 20 to 40 parts of fat main chain benzoxazine, 20 to 40 parts of metal hydroxide, 0.4 to 0.6 part of curing agent and 70 to 80 parts of composite solvent. The modified flame-retardant epoxy resin serves as a flame retardant, the flame retardance of the epoxy resin is improved, in the curing process of the epoxy resin, no by-product small molecules are generated, defects are reduced, and the mechanical property of the obtained copper-clad plate is improved; due to the addition of the aromatic main chain benzoxazine, Tg is increased, and dielectric loss is reduced; due to the addition of the fat type main chain benzoxazine, the processing performance and the thermal performance of the material are improved. The copper-clad plate has application prospects in microwave communication, aerospace and printed circuit boards.