47results about How to "Reduce flammability" patented technology

The invention relates to an antibacterial PP material and a preparation method thereof, and belongs to the technical field of high polymer materials. The antibacterial PP material is prepared from the following components in parts by weight: 60 to 80 parts of PP resin, 2 to 4 parts of a surfactant, 0.5 to 1.5 parts of a modified antibacterial agent, 0.5 to 1.5 parts of a flame retardant and 0.2 to 0.8 part of an antioxidant, titanium ions in the modified antibacterial agent destroy bacterial cell walls, quaternized intermediate products react with proteins of cell membranes to accelerate bacterial death, and in addition, phenolic hydroxyl groups absorb ultraviolet rays with different wavelengths to inhibit the light aging process; a compact and continuous carbon layer is formed during combustion of the flame retardant and cooperates with phosphorus-oxygen double bonds and melamine, the flame retardant efficiency is improved, aluminum hydroxide coats the surface, hydroxyl is subjected to heat absorption decomposition during combustion, the surface temperature of combustible materials is stabilized, meanwhile, an inert aluminum oxide layer is formed, and the flammability is reduced. The antibacterial PP material prepared by the invention not only has good antibacterial and anti-aging effects, but also has excellent flame retardant property.

The invention relates to the field of sealing strips, and discloses a low-VOC (volatile organic compound) automobile sealing strip composite PVC (polyvinyl chloride) material and a preparation method thereof, the material comprises PVC resin, ethylene propylene diene monomer, a modified mesoporous ZIF-8 nano material, composite filler and the like; the modified mesoporous ZIF-8 nano material is prepared by grafting a hydroxylated antioxidant component on the surface of the mesoporous ZIF-8 nano material by using isophorone diisocyanate, and the hydroxylated antioxidant component is prepared by reacting N-(4-anilinophenyl) maleimide with 2-mercaptoethanol; the composite filler is prepared by grafting modified nano silicon dioxide and aminated basalt fiber, the modified nano silicon dioxide is prepared from phenylphosphoryl dichloride, diethanol amine, dibutyl phosphate and isophorone diisocyanate as raw materials, and the aminated basalt fiber is prepared by modifying with an aminated silane coupling agent; the modified mesoporous ZIF-8 nano material and the composite filler are added, so that the flame retardant property, the thermal aging resistance and the mechanical property of the material are improved.

The invention discloses a gel polymer electrolyte based on a flame-retardant local high-concentration electrolyte, a preparation method of the gel polymer electrolyte and application of the gel polymer electrolyte in a battery. The preparation method comprises the following steps: S1, mixing a lithium salt with a non-combustible phosphate solvent, and then adding a diluent to obtain a basic electrolyte; s2, dissolving a monomer and a free radical initiator in the basic electrolyte to form a precursor solution; and S3, carrying out reaction on the precursor solution at 60-80 DEG C for 4-24 hours to obtain the gel polymer electrolyte. The prepared gel polymer electrolyte has a unique ion solvation structure in a local high-concentration electrolyte, a good solid electrolyte interface film (SEI) can be formed, the in-situ preparation method of the polymer electrolyte can reduce the interface impedance, and the gel polymer electrolyte shows excellent performance in the aspects of stabilizing a nickel-rich positive electrode interface and adjusting the lithium deposition form. While good electrochemical stability of a phosphatide-based electrolyte with good flame retardance and a high-nickel lithium metal battery system is considered, the construction mode of an anion-rich solvation structure is expanded.

The invention relates to the technical field of surface corrosion prevention, and discloses a high-strength corrosion-resistant steel bar surface epoxy coating and a preparation method thereof. The high-strength corrosion-resistant steel bar surface epoxy coating comprises the following components in parts by weight: 1-5 parts of modified polyaniline / TiO2 powder, 8-10 parts of aluminum triphosphate, 8-10 parts of zinc phosphate, 8-10 parts of talcum powder, 10-15 parts of barium sulfate, 100-200 parts of modified epoxy resin, 50-100 parts of a curing agent, 10-20 parts of an accelerant and 1-3 parts of a flatting agent. The modified polyaniline / TiO2 high-strength corrosion-resistant epoxy coating provided by the invention has the advantages of self-cleaning, scratch resistance, corrosion resistance, wear resistance and the like, and polyaniline has excellent host capability of capturing nano particles and can be co-doped with some active inorganic nano particles to effectively improve the solubility and corrosion resistance of the nano particles. And the modified epoxy resin has the characteristic of high temperature resistance, so that more comprehensive protection is further provided for the reinforcing steel bar. The method is low in cost and environment-friendly, and has good social and economic benefits.

The invention discloses a polyion liquid-based solid electrolyte, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method provided by the invention comprises the following steps: dispersing LLZTO nanoparticles into a polyacrylonitrile solution to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a composite fiber membrane; the preparation method comprises the following steps: mixing poly (diallyldimethylammonium) bis (fluorosulfonyl) imide, lithium bis (fluorosulfonyl) imide and 1-methyl-1-propyl pyrrolidinium bis (fluorosulfonyl) imide in a solvent to obtain a polyion liquid electrolyte solution; and immersing the composite fiber membrane into the polyion liquid electrolyte solution, taking out, standing and drying to obtain the composite fiber membrane. The solid electrolyte prepared by the invention has relatively high ionic conductivity and mechanical strength, and good flexibility and flame retardance, and a battery prepared from the solid electrolyte can circulate for more than 200 circles under high-rate current density.

Redox active S-linked polymers, vulcanized matrices, and related composites, compositions, electrode materials, electrodes, and related electrode chemical cells, batteries, methods, and systems are described. In particular, polymers and related compositions, composites, electrode materials and electrodes having the following S-links are described: a redox potential of up to 3.5 V and a capacity of up to 800 mAh / g or greater relative to the Li / Li + electrode potential under standard conditions. More particularly, redox active S-linked polymers, vulcanized matrices and related composites and compositions are provided as electrode materials for the cathode of an electrochemical cell further comprising a Li anode and a non-aqueous electrolyte.

The invention relates to the technical field of furniture boards, and discloses an environment-friendly shaving board and a preparation method thereof.The environment-friendly shaving board is prepared from pentaerythritol glycidyl ether, hexadecyl dimethyl tertiary amine, epoxy chloropropane and the like, an obtained polyepoxy quaternary ammonium salt cross-linking agent generates multiple bonding effects with soybean protein, polyhydroxy phytic acid and graphene oxide, and the environment-friendly shaving board is prepared. The obtained environment-friendly flame-retardant mildew-proof adhesive and bamboo wood shavings are subjected to glue mixing and hot press molding, and the environment-friendly shaving board is obtained. Polyhydroxy phosphoric acid is rich in phosphorus element and has a flame-retardant effect; the quaternary ammonium salt group has a relatively good prevention and treatment effect on molds and chromotropic bacteria; the polyepoxy quaternary ammonium salt cross-linking agent is equivalent to a physical cross-linking point in the shaving board, and is nailed and anchored together with the bamboo shavings due to an adhesive, so that microcracks are prevented from further expanding into large cracks, the board blank is denser, and the reinforcing and toughening effects are achieved; the raw materials are wide in source, non-toxic, harmless, free of formaldehyde release and environment-friendly.

This invention discloses an electrolyte and a battery. The electrolyte comprises an electrolyte, a solvent, and a first additive, the first additive having the structural formula (1). The first additive contains silicon-based phosphate groups, which have low oxidation and reduction potentials. It can generate an inorganic interface film rich in P and Si at the positive and negative electrodes. The generated interface helps to reduce the interfacial impedance of the positive and negative electrodes. Cyclic phosphates have good high-voltage stability. The generated phosphate compounds can suppress excessive ion deposition during the high-voltage positive electrode phase transition, providing better protection for the positive and negative electrode interfaces and improving high-voltage cycle performance. The polycyclic phosphate structure can capture hydroxyl radicals and hydrogen radicals generated by the electrolyte at high temperatures, preventing the diffusion reaction of hydrocarbon radicals. At the same time, the silicon-based structure can generate a stable thermally stable film at the positive and negative electrode interfaces. The generated high-thermal-stability inorganic thermal insulation protective layer can reduce the flammability of the electrolyte and significantly improve the safety performance of the battery.

The invention discloses a power battery pack anti-explosion pressure relief device, and belongs to the technical field of power battery equipment, the power battery pack anti-explosion pressure relief device comprises a fixing assembly, the fixing assembly comprises a lower fixing bag, the upper side wall of the lower fixing bag is fixedly connected with an upper fixing bag, two partition plates are fixedly connected in the lower fixing bag, and a plurality of cooling assemblies are arranged in the lower fixing bag; and the cooling assembly comprises a battery unit, an anti-explosion valve is engraved at the upper end of the battery unit, a water storage box is fixedly connected to the side wall of the battery unit, a waterproof film is fixedly connected to the interior of the water storage box, and a vertical pipe is fixedly connected to the upper side wall of the battery unit. The pressure of the gases is utilized to enable the gas valve assembly to release a large amount of carbon dioxide, and the carbon dioxide is mixed with the gases sprayed by the battery, so that the gases sprayed by the battery are effectively diluted, the concentrations of combustible gases and toxic gases are reduced, and the inflammability and toxicity of the gases are reduced.

This invention discloses a flame-retardant interface-stabilized electrolyte for high-voltage layered oxide sodium-ion batteries and its preparation method. The electrolyte comprises a composite sodium salt and a mixed organic solvent. The composite sodium salt includes sodium difluorosulfonylimide, sodium oxalate borate, and / or sodium difluorooxalate borate. The mixed organic solvent includes a phosphate ester flame-retardant solvent, a sulfone solvent, a hydrofluoroether diluent, and a small amount of electron-deficient nitrogen-containing aromatic nitrile interface-regulating molecules. This electrolyte does not rely on conventional additives such as ethylene carbonate and fluoroethylene carbonate. Through the flame-retardant framework solvent, anion-dominated film formation, and the regulating effect of electron-deficient aromatic nitrile on the residual alkali of layered oxides and the surface of high-valence transition metals, a stable and oxidation-resistant protective interface is formed on the positive electrode surface, while simultaneously ensuring low-resistance film formation on the hard carbon negative electrode side. This invention is applicable to high-voltage layered oxide sodium-ion batteries with cutoff voltages from 4.15 V to 4.50 V, and can simultaneously improve safety, long-cycle stability, and high-temperature storage performance.

The utility model relates to the technical field of yellow dextrin production and processing, and discloses a dust removal device for yellow dextrin production and processing, which comprises a box body, an exhaust pipe is fixedly connected to the left side of the box body, a connecting strip is fixedly connected to the right side in the exhaust pipe, and a motor is fixedly connected to the middle of the connecting strip. The output end of the motor is fixedly connected with a fan, the left side of the interior of the exhaust pipe is fixedly connected with a mesh enclosure, the right side of the exhaust pipe is fixedly connected with a connecting pipe, the right side of the connecting pipe is fixedly connected with an air inlet pipe, the middle side of the interior of the box body is fixedly connected with a filter screen, and the air inlet pipe penetrates through the filter screen and extends to the lower portion of the interior of the box body. According to the device, air dust near yellow dextrin is sucked, the dust content in the air is reduced, the dust is prevented from falling into the yellow dextrin, the purity and the quality of products are prevented from being influenced, meanwhile, the cleanness of a production workshop is maintained, dust accumulation of production equipment is reduced, the production efficiency is improved, and the service life of the equipment is prolonged.

The utility model relates to the technical field of sponges, and discloses a slow-rebound sponge which comprises a breathable protective layer, breathable holes are formed in the side faces of the periphery of the breathable protective layer, an activated carbon absorption layer is arranged in the center of the breathable protective layer, and breathable grooves are distributed in the breathable protective layer from the center of activated carbon to the periphery in a diffusion mode. The breathable protective layer is connected with the buffer layer through the activated carbon layer, the buffer layer comprises a connecting body, the periphery of the connecting body extends outwards to form a partition plate layer, the partition plate layer is connected with the fixing layer, and the fixing layer and the partition plate layer are connected with each other to form the buffer groove. The high-elasticity sponge is arranged in the buffer groove, the slow-rebound-resilience sponge can effectively guide and keep air circulation through a breathable net groove formed by intersecting a breathable protective layer formed by the breathable grooves and the breathable grooves, and the sponge can keep high elasticity and has high softness through cooperation of the triangular grooves and high-elasticity materials.

The embodiment of the invention provides a secondary battery and electric equipment, and the secondary battery provided by the embodiment of the invention is characterized in that an electrolyte comprises a fluorine-containing organic solvent, a fluorine-containing lithium salt and a fluorine-containing additive; the fluorine-containing organic solvent comprises a fluorine ether saturated compound and a fluorine cyclic ester compound; the fluorine-containing additive comprises a fluoroether unsaturated compound; according to the electrolyte, the fluoroether saturated compound and the fluorine cyclic ester compound are used as solvents, the fluorine-containing lithium salt is used as an electrolyte, and the fluoroether unsaturated compound is added as an additive, so that the flammability of the electrolyte can be effectively reduced, and the fluoroether saturated compound not only can regulate and control the formation of an interface SEI membrane through molecular polarity, but also can regulate and control the flammability of the electrolyte. And the lithium ion secondary battery can also cooperate with fluorine-containing lithium salt to reduce interface impedance and inhibit generation of lithium fluoride (LiF) by-products, so that the problem of relatively poor cycle performance of the existing secondary battery is improved.

This invention relates to the field of building electromechanical installation technology, and discloses a BIM-based integrated layout and modular prefabrication and installation system for electromechanical pipelines. The system includes multi-disciplinary pipelines and integrated supports installed under the exterior building roof slab. The integrated supports include columns, combined steel beams, and pipe clamps. The pipe clamps are configured as variable-angle pipe clamp assemblies, comprising a variable-angle base connected to the combined steel beam and a clamp movably connected to the variable-angle base. The clamp has an adjustable degree of freedom to rotate relative to the horizontal direction within the vertical longitudinal section, so that the clamping axis of the clamp is aligned with the inclined axis of the inclined ramp section. This invention achieves zero-collision pre-assembly before construction, eliminates potential hazards from on-site demolition and alteration, precisely ensures the physical clearance height between driveways and parking spaces, and the modular prefabricated variable-angle damping pipe clamps passively adapt to and conform to the 45-degree inclined ramp path adjusted by BIM.

The invention discloses a dust removal device for electrical engineering and automation thereof. The dust removal device comprises a placement plate, a dust removal box, a bottom plate, a water bucket, an exhaust fan, a telescopic hose and a water pump. A first damping mechanism and a second damping mechanism are arranged between the placing plate and the bottom plate; a dust removal box, a water bucket and an exhaust fan are arranged on the placement plate; the water pumping end of the water pump is connected with the water bucket through a pipeline, and the water outlet end is connected with the top of the dust removal box through a water pipe; the air exhaust end of the exhaust fan is connected with the telescopic hose, and the air outlet end of the exhaust fan is connected with the dust removal box through a pipeline. The dust removal device for electrical engineering and automation thereof has multiple damping functions, dust treatment is facilitated, and the position of the exhaust pipe can be adjusted.

The invention discloses a battery combustion suppression device and system, the battery combustion suppression device comprises a shell, a gas channel for flowing of discharged gas is formed in the shell, and the shell is provided with a gas inlet communicated with a discharge port of a battery module or a battery pack and a gas outlet communicated with the outside; wherein at least part of the inner surface of the gas channel is provided with a perfluorohexanone fire extinguishing material, and the perfluorohexanone fire extinguishing material is used for releasing perfluorohexanone fire extinguishing gas and discharging the perfluorohexanone fire extinguishing gas from the gas outlet after the perfluorohexanone fire extinguishing gas is mixed with the discharged gas when the high-temperature and high-pressure discharged gas enters the gas channel through the gas inlet. The fire extinguishing material is introduced into the discharge path, so that the discharged gas is synchronously released and mixed in the flowing process to form low-oxygen and non-combustible mixed gas, eruptive combustion is inhibited before the gas is discharged, the safety of the lithium battery in the early stage of thermal runaway can be improved, the fire risk is reduced, and the service life of the lithium battery is prolonged. The method is suitable for safety protection of the battery module and the battery pack.

The invention relates to an electrolyte of a whole-chlorine solvent and an electrochemical device, the electrolyte of the whole-chlorine solvent comprises electrolyte salt and the whole-chlorine solvent, and the whole-chlorine solvent is composed of chlorinated ether and chlorinated carbonic ester. The electrolyte of the whole-chlorine solvent provided by the invention adopts the chlorinated ether and the chlorinated carbonate as the solvent of the electrolyte, does not contain flash point components, and has low volatility, low inflammability, flame retardance and compatibility with positive and negative electrodes, so that the battery shows good electrochemical performance and relatively high safety.

The invention relates to the technical field of fluororubber, in particular to a fluororubber sealing ring based on a sealing contact pin and a preparation process of the fluororubber sealing ring. The fluororubber sealing ring comprises the following components in parts by weight: 80-120 parts of fluororubber, 5-10 parts of an acid acceptor, 5-15 parts of a plasticizer, 10-20 parts of a reinforcing agent, 8-16 parts of modified white carbon black, 15-30 parts of composite filler, 5-10 parts of an accelerant and 3-8 parts of a vulcanizing agent. The fluororubber, the acid acceptor, the plasticizer, the reinforcing agent, the modified white carbon black and the composite filler are mixed to obtain a mixed rubber material; and uniformly mixing the rubber compound, a vulcanizing agent and an accelerant, sequentially carrying out first-stage vulcanization and second-stage vulcanization, and then carrying out a hot press molding process to obtain the fluororubber sealing ring. The fluororubber sealing ring prepared by the invention has excellent mechanical properties and also has aging resistance and flame retardance, so that the service life of the fluororubber sealing ring is prolonged.

An inert coating system includes a reformer (128) that generates hydrogen (130) and carbon dioxide (135). The hydrogen gas (130) is separated from the carbon dioxide (135). Carbon dioxide (135) is delivered to the vapor region (122) of the canister (114) to reduce flammability of the gas in the vapor region (122) of the canister (114). The excess carbon dioxide (135) is fed to an overflow system (150) which is designed to store the excess carbon dioxide (135) for future use or to isolate the carbon dioxide (135).

The application discloses a preparation method of a complex, and relates to the technical field of boron trifluoride production, and comprises the following steps: S1, vaporizing a ketone intermediate and mixing the ketone intermediate with boron trifluoride gas to perform a complexing reaction, so as to obtain a ketone-boron trifluoride complex; S2, adding diethyl ether drop by drop into the ketone-boron trifluoride complex to perform a coordination reaction, and obtaining a reaction mixture after the reaction is completed; and S3, washing, filtering and evaporating and drying the reaction mixture to obtain a boron trifluoride-diethyl ether complex. According to the preparation method, the intermediate complex is prepared first, and then the boron trifluoride-diethyl ether complex is prepared through a coordination reaction, so that the generation of impurities is reduced, the purity of a product is improved, the operation is safer, the stability of boron trifluoride is protected in the reaction process, and the volatilization and loss of boron trifluoride are reduced.

The utility model relates to the technical field of lithium battery crushing, and discloses a lithium battery crusher which comprises a crushing bin, a driving device is fixedly installed on the right side of the crushing bin, the upper portion of the crushing bin is communicated with a storage bin, an opening and closing device is arranged in the storage bin, the upper portion of the storage bin is communicated with a feeding port, and the upper portion of the feeding port is communicated with a discharging port. And a discharging device is arranged in the feeding opening, a cover plate is arranged at the top of the feeding opening, and a nitrogen inlet and a water inlet are formed in the front side of the upper end of the crushing bin. The crushing bin adopts double-layer fire extinguishing of nitrogen and an induction water nozzle, so that the flammability of materials is reduced, and the safety is improved; the explosion venting valve is adopted in the crushing area, so that the explosion phenomenon of materials in the crushing area is avoided, the safety of workers is improved, the safety of the working environment and the safety of the workers are improved, and damage to equipment is reduced.

The invention discloses a self-stratifying and membrane-free aqueous zinc-iodine secondary battery and a construction method of the self-stratifying and membrane-free aqueous zinc-iodine secondary battery. The electrolyte of the battery is composed of an organic phase and a water phase, the organic phase is prepared by dissolving tetrabutylammonium iodide, 1-butyl-3-methylimidazolium hexafluorophosphate and iodine in acetonitrile, and the water phase is composed of zinc sulfate, magnesium sulfate and deionized water. The electrode structure adopts an integrated design and is formed by sequentially connecting zinc and graphite felt through a copper wire and titanium from bottom to top. According to the self-stratification electrolyte, iodine species can be firmly restrained in an organic layer through an extraction effect, so that the problems of low iodine loading capacity, fast capacity fading, high self-discharge rate and the like of a zinc-iodine battery are solved while the use of an expensive ion exchange membrane is avoided; and the integrated electrode structure is combined with the self-stratification electrolyte, so that the Ah-level battery can be quickly assembled and the electrolyte can be quickly recycled within a few hours, and the preparation procedure and process of the battery are greatly simplified.

The present invention relates to the technical field of copper clad laminate preparation, specifically an aluminum hydroxide filled epoxy resin for copper clad laminate and a preparation method thereof. The present invention obtains a core-shell toughening filler by adding an emulsifier, deionized water, n-butyl acrylate, 1,4-butanediol diacrylate, an initiator, a core layer pre-emulsion and a shell layer pre-emulsion. Polysiloxane is obtained by adding modified silane, dimethyldimethoxysilane, deionized water, a catalyst, a capping agent and acetic acid. A core-shell flame retardant is obtained by adding aluminum hydroxide powder, anhydrous ethanol and phosphoric acid; and then polysiloxane, a core-shell flame retardant and anhydrous ethanol are mixed to obtain a composite flame retardant. Finally, epoxy resin, a composite flame retardant, a core-shell toughening filler, a curing agent, a curing accelerator and a solvent are mixed, and a finished product is obtained by high-speed stirring. The finished product obtained by the present invention has good flame retardancy and mechanical properties, and therefore has broad application prospects in the technical field of copper clad laminates.

The present invention relates to a method for manufacturing a lithium metal electrode, wherein the method comprises the following steps: providing a lithium metal strip; and placing a lubricant composition containing a fluorine solvent and a fluorine compound on the lithium metal strip, and rolling the lithium metal strip.

The utility model relates to the field of cooking utensils, and provides an electric coupler and a cooking utensil, the electric coupler comprises a pedestal, a coupler body and a protection member, the coupler body is fixed on the pedestal; the protection piece is connected to the base, and the protection piece is located on one side of the coupler body; a bearing face is formed on the side, close to the coupler body, of the protection piece and comprises a flame-retardant material. According to the electric coupler and the cooking utensil provided by the utility model, one side, close to the coupler body, of the protection piece forms the bearing surface, when the coupler body is on fire, glue drops generated by melting of the coupler body drop downwards under the action of gravity, and at the moment, the protection piece located on one side of the coupler body prevents the glue drops from falling continuously, so that the service life of the coupler body is prolonged. The bearing surface is used for receiving the falling glue drops, so that the glue drops are prevented from dripping; the bearing surface is made of a flame-retardant material so as to restrain fire spreading; the protection piece is arranged on one side of the coupler body, a shell of a whole electric appliance does not need to be replaced with a flame-retardant material, the fireproof effect can be achieved, and the production cost is saved.

The application discloses a hydrogen injection strategy optimization method for a dual-fuel X-type rotor engine, obtains geometric parameters of the X-type rotor engine, establishes a CDF fluid simulation model of a dual-fuel X-type rotor engine with gasoline intake port premixing and hydrogen in-cylinder direct injection, determines engine ignition parameters and operating conditions of a single hydrogen injection strategy, and obtains, through simulation calculation, a hydrogen injection time point at which a hydrogen distribution area is maximum and a hydrogen injection time point at which a flame front area is maximum. Under the condition that the hydrogen injection total amount at the two hydrogen injection time points is the same as that of the single hydrogen injection strategy and the hydrogen injection mass fraction at the two hydrogen injection time points is taken as a variable, the hydrogen injection mass fraction corresponding to the hydrogen injection time point at which the hydrogen distribution area is maximum and the hydrogen injection mass fraction corresponding to the hydrogen injection time point at which the flame front area is maximum are obtained through simulation calculation, an optimal two-stage hydrogen direct injection strategy of the dual-fuel X-type rotor engine is obtained, and the thermal efficiency and emission performance of the rotor engine are improved.

The invention provides a PVC (Polyvinyl Chloride) pipe and a preparation method thereof. The PVC pipe is prepared from the following raw materials in parts by weight: 100 parts of PVC resin, 1.6 to 4.8 parts of metal stearate, 10.0 to 14.0 parts of nitrile rubber, 0.8 to 1.4 parts of anti-aging agent ABS (Acrylonitrile Butadiene Styrene), 6 to 10 parts of flame retardant, 2.1 to 3.2 parts of lubricant, 9.0 to 9.5 parts of calcium carbonate, 4.0 to 5.0 parts of processing agent ACR, 2.2 to 3.2 parts of EVA (Ethylene-Vinyl Acetate), 0.6 to 0.9 part of plasticizer, 4.0 to 5.0 parts of color master batch, 1.0 to 5.0 parts of silicon rubber and 5.0 to 15.0 parts of heat-resistant filler. By adding the metal stearate into the raw materials, the thermal stability of the PVC pipe can be improved, the thermal degradation process can be delayed, by adding the flame retardant, the flame retardant property of the PVC pipe can be improved, and the flammability in a high-temperature environment can be reduced; by adding the silicone rubber, the heat resistance of the PVC pipe can be improved, and the cold resistance of the PVC pipe can be improved; and by adding the heat-resistant filler, the strength and heat resistance of the PVC pipe can be improved.

The application discloses a heat transfer composition and a preparation method and application thereof. According to the total mass of the composition, the mass proportions of a first component, trans-1,3,3,3-tetrafluoropropene and difluoromethane are x%, y% and z% respectively, the first component is 2,3,3,3-tetrafluoropropene and 1,1-difluoroethane, the proportions (x, y, z) of the three are located in a ternary phase diagram, the x coordinate of point A is 23.6%, the x coordinate of point B is 90.0%, the coordinates of points on the curve segment AB are (x, 70.06-0.6395x-0.001538x 2 , 29.94-0.3605x+0.001538x 2 ), and the coordinates of point C are (77.6, 0, 22.4). The composition has a GWP of not more than 150 and a flammability level of A2L, is a low-global-warming-potential, high-refrigeration / heat-efficiency and low-flammability heat transfer composition for replacing propane, and is suitable for refrigeration / heat application.

The present invention relates to the field of engine technology, and in particular to an air-breathing ramjet engine, which includes a cooling structure, which is composed of a phase change cooling chamber, a solid cooling pipe, a liquid cooling pipe, a liquid cooling pump, a phase change storage chamber, and a phase change cooling pump. The present invention utilizes a method of arranging a plurality of cooling pipes or structures, which are wrapped outside the combustion chamber of the ramjet engine, and effectively reduces the problem of failure of heat dissipation equipment caused by deformation of the combustion chamber during operation, while improving the performance of the ramjet engine, thereby effectively avoiding the decline of the combustion performance of the ramjet engine.

The invention relates to a building insulation board, which comprises the following raw materials by mass: 90-100 parts of aluminate cement; 10 to 15 parts of polyphenyl particles; 1-3 parts of polypropylene fiber; 4-6 parts of a foaming agent; 3-5 parts of acrylate and styrene copolymerized rubber powder; 6-8 parts of phosphoric acid; and 2-4 parts of aluminum hydroxide. The mode that modified polyphenyl particles are compounded in aluminate cement is adopted, the flammability of the insulation board can be reduced, the compounding property of the polyphenyl particles in the whole system can be improved, the integrality of the whole system is enhanced through the acrylate and styrene copolymer rubber powder and the polypropylene fiber, the overall strength of the building insulation board is guaranteed, and the building insulation board is suitable for being used as a building insulation board. And the foaming agent plays a role in foaming, so that the aim of preparing the light and heat-insulating heat-insulating plate can be finally achieved.