1160 results about "Acetylene" patented technology

The invention relates to the field of new energy battery buffer parts, in particular to an anti-static foaming silica gel buffer part for a new energy battery and a preparation method of the anti-static foaming silica gel buffer part. The anti-static foaming silica gel buffer part is prepared by mixing and foaming anti-static mixed rubber, a foaming agent, hydrogen-containing silicone oil, an inhibitor and a platinum catalyst, the anti-static rubber compound is prepared from the following raw materials in percentage by weight: 37-50% of methyl vinyl silicone rubber raw rubber, 38-45% of white carbon black, 8-15% of anti-static filler and 1-3% of hydroxyl silicone oil; the antistatic filler is composed of an antistatic agent and a silane-containing active agent; the antistatic agent is composed of acetylene carbon black and a single-walled carbon nanotube. Under the action of the silane-containing active agent, the acetylene carbon black and the single-walled carbon nanotubes are interwoven to form a stable supporting antistatic skeleton structure, so that static electricity can be effectively conducted, static electricity accumulation is avoided, the structure is kept stable in long-term use, and the compression resilience and antistatic durability of the buffer part are ensured.

The invention discloses a system for preparing acetylene by partial oxidation of natural gas, which comprises a natural gas preheating furnace, an oxygen preheating furnace and an acetylene furnace, both the natural gas preheating furnace and the oxygen preheating furnace are communicated with the acetylene furnace, the acetylene furnace is communicated with a quenching water inlet pipe, and a pyrolysis gas outlet of the acetylene furnace is directly connected with a YT membrane dust remover. According to the scheme, the problems that in the prior art, a carbon black water system is large in carbon black removal difficulty and high in carbon black post-treatment cost, VOCs and carbon black floating influence the environment when carbon black is removed through an open-type carbon black water tank, waste heat of the system is difficult to utilize, and wet carbon black adheres to the inner wall of a pyrolysis gas pipeline and blocks the pipeline are solved.

This invention relates to a method for using a low-content ruthenium-based catalyst modified with nitrogen and oxygen ligands in the hydrochlorination of acetylene. The invention utilizes 2-pyridine carboxylate as a ligand, commercial activated carbon as a support, trace amounts of ruthenium as the main active component, and water as a solvent. An improved synthesis procedure yields a low-content ruthenium-based catalyst with ruthenium ions coordinated by a modifier and commercial activated carbon as a support, significantly improving catalyst performance while reducing ruthenium content. This catalyst exhibits high activity and vinyl chloride selectivity in the fixed-bed hydrochlorination of acetylene to vinyl chloride, and its low cost makes it highly valuable for industrial applications. The ruthenium loading is 0.1%, and the reaction gas space velocity is 170 h⁻¹. ‑1 V (C2H2) / V (HCl) With a ratio of 1:1.05 and a reaction temperature of 180℃, the acetylene conversion rate can reach 84.3%, the vinyl chloride selectivity is greater than 99%, and the activity remains basically unchanged within 10 hours.

The invention relates to an acetylene purification system and method, in particular to a method for removing impurities in acetylene to an electronic-grade acetylene level through a membrane separation technology coupled rectification process, and belongs to the field of gas separation. Aiming at the characteristics of an industrial grade acetylene material, the invention provides a technology for preparing electronic grade acetylene based on membrane separation coupling rectification, the membrane separation technology and the rectification technology are organically coupled, and a safe solvent is introduced into a rectification tower, so that the thermal stability of liquid acetylene is effectively improved, and the explosion risk is remarkably reduced. According to the technology, efficient preparation of the electronic-grade acetylene (the purity is greater than or equal to 99.9999%) is realized, and the method has a good industrial application prospect and popularization value.

The invention relates to the technical field of electrode materials, in particular to a CuO-coated PVDF electrode material and a preparation method and application thereof.The preparation method comprises the following steps that a waste solar photovoltaic back plate is smashed and hydrolyzed under the alkaline condition, a polyethylene glycol terephthalate layer on the surface of the photovoltaic back plate reacts with alkali to generate ethylene glycol and terephthalic acid salt, and then a CuO-coated PVDF electrode material is obtained; pVDF in the photovoltaic backboard is separated in a precipitation form, and PVDF is prepared; the preparation method comprises the following steps: dissolving a cupric salt and a cationic surfactant in water, carrying out a co-precipitation reaction at room temperature in an alkaline environment to generate a nano Cu (OH) 2 precipitate, and drying and decomposing to obtain a CuO precursor; cuO, PVDF, acetylene black and an organic solvent are mixed and stirred, in the stirring process, the surface of CuO is coated with PVDF in situ, acetylene black is evenly distributed, and the CuO-coated PVDF electrode material with CuO nanoparticles as an inner core, PVDF as a shell and acetylene black evenly distributed is formed.

The invention provides a metal element doped zinc-aluminum spinel catalyst as well as a preparation method and application thereof. Lattice sites on the surface of the zinc-aluminum spinel are accurately anchored by metal elements in a monatomic form, a lattice atom substitution or gap doping strategy is realized, and the technical problem of preparation of the metal element doped zinc-aluminum spinel in the prior art is mainly solved. The preparation method of the metal element doped zinc-aluminum spinel comprises the following steps: dissolving a zinc source, an aluminum source, a metal M (Ni / Cu / Pt / Pd) precursor and a precipitator in water, stirring and mixing, carrying out hydrothermal treatment, separating solids, filtering, drying, and calcining to obtain the metal element doped zinc-aluminum spinel catalyst (M-ZnAl2O4). Wherein the nickel metal element is doped with the zinc-aluminum spinel catalyst, so that larger nickel particles are more favorably formed, the particle size distribution is uniform, and the catalytic activity and the stability are greatly improved in the reaction of preparing ethylene through acetylene hydrogenation; the copper-nickel metal element doped zinc-aluminum spinel catalyst also shows good catalytic activity and stability in a methanol reforming hydrogen production reaction.

To provide a method for producing a triazole skeleton-containing polymer having a desired substituent, and to provide the triazole skeleton-containing polymer.SOLUTION: The present invention provides a method for producing a triazole-skeleton-containing polymer, the method including a step of reacting an acetylene group contained in a starting material polymer with an azide group-containing compound to obtain the triazole-skeleton-containing polymer, the starting material polymer being a polymer containing a first monomer unit 1A derived from a monomer having the acetylene group and a second monomer unit derived from a second monomer, the triazole-skeleton-containing polymer having a triazole-skeleton-containing monomer unit and the second monomer unit.SELECTED DRAWING: None

The invention relates to the technical field of special cables, and discloses a high and low temperature resistant composite insulating layer cable and a preparation method thereof.The cable comprises a conductor core and a composite insulating layer wrapping the conductor core, and the composite insulating layer comprises a high temperature resistant heat conduction core layer and a low temperature resistant elastic layer; the high-temperature-resistant heat-conducting core layer is prepared from the following raw material: polyamide acid; hexagonal boron nitride; alpha-phase silicon carbide; the preparation method comprises the following steps: adding gamma-amino propyl triethoxy silane; nano barium titanate; the low-temperature-resistant elastic layer is prepared from the following raw materials: vinyl terminated polydimethylsiloxane; performing hydrophobic treatment on fumed silica; a Karstedt catalyst; a hydrogen-containing silicone oil crosslinking agent; the average particle size D50 of the 1-ethynyl-1-cyclohexanol and the alpha-phase silicon carbide is 0.5 to 2 mu m. According to the invention, by adopting a microwave selective heating and interlayer heat conduction mechanism, efficient and high-quality integrated curing of the composite insulating layer is realized.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.

The invention discloses a preparation method of a hydrophobic modified copper-based monatomic catalyst. The preparation method comprises the following steps: S1, dissolving Cu (NO3) 2 and L-alanine in deionized water; dissolving trimesic acid in an ethanol solution; s2, mixing the two solutions, and stirring at regular time at normal temperature to obtain a Cu-BTC precursor; s3, grinding and uniformly mixing the Cu-BTC precursor and dicyandiamide, and then putting the mixture into a tubular furnace for high-temperature pyrolysis treatment to obtain Cu-N-C-Pre powder; s4, the Cu-N-C-Pre powder is subjected to acid leaching impurity removal treatment in an acid solution, and the copper-based monatomic catalyst is obtained; and S5, dissolving the Cu-N-C catalyst and triacetylene benzene in an organic solvent, adding pyridine, uniformly stirring, and carrying out a hydrothermal reaction to obtain the hydrophobic modified copper-based monatomic catalyst. Hydrophobic modification is performed on the surface of the Cu-N-C monatomic catalyst, so that the hydrophobicity of the surface of the catalyst is enhanced, the catalytic activity of the catalyst in a reaction for preparing phenol by activating a benzene C-H bond by taking H2O2 as an oxidizing agent is improved, and the yield of phenol is increased.

The invention relates to the technical field of heat-conducting interface materials, in particular to a heat-conducting pad material, a heat-conducting pad and a preparation method and application thereof. The heat conduction pad material is prepared from the following raw materials in parts by weight: 2400 to 2880 parts of heat conduction powder, 100 to 600 parts of liquid silica gel, 5 to 30 parts of hydrogen-containing silicone oil, 1 to 3 parts of platinum catalyst, 0.01 to 1.00 parts of alkynol compound and 10 to 60 parts of composite coupling agent, the heat-conducting powder is provided with heat-conducting materials with at least two particle sizes; the sodium oxide impurity content of the heat-conducting powder is less than or equal to 200ppm, and the chloride ion content is less than or equal to 5ppm; the small molecule volatile matter content of the liquid silica gel is less than or equal to 50ppm; and the ratio of the amount of substance of the liquid silica gel to the hydrogen-containing silicone oil is less than or equal to 1: 1.5. The heat conduction pad material is based on a strategy of raw material selection, reaction control and curing optimization (assisted by a catalyst, an inhibitor and a coupling agent), and volatilization and diffusion of siloxane small molecules are effectively inhibited or reduced.

The invention relates to a copper-based catalyst for catalyzing acetylene hydrochlorination and a preparation method and application thereof, the copper-based catalyst comprises a carrier, a phosphine-containing ligand and a copper-containing stable metal precursor; the molar ratio of the stable-state metal precursor to the phosphine-containing ligand is (2: 1)-(16: 1), and the mass of copper in the copper-containing stable-state metal precursor is 5-10% of the mass of the copper-based catalyst. For a copper-based catalyst containing ligand dimethyl phosphine oxide, when reaction gas contains a certain amount of water vapor, the activity and selectivity of the catalyst are still maintained at a relatively high level; when the reaction gas contains a certain amount of hydrogen, the influence on the activity and selectivity of the catalyst is small, which indicates that the catalyst has excellent hydrophobicity and reduction resistance in the acetylene hydrochlorination reaction, thereby not only enhancing the generation efficiency of the vinyl chloride monomer, but also prolonging the service life of the catalyst and lowering the production cost.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane. The preparation method comprises the following steps: S1, acetylene and dimethylchlorosilane are subjected to a hydrosilylation reaction under the action of a platinum monatomic catalyst, and a mixture is obtained; s2, pressurizing the mixture to 0.1-0.2 MPa, and condensing through a condenser; s3, the gas phase is recycled, and the liquid phase part is subjected to rectification separation to obtain vinyl dimethyl chlorosilane; s4, carrying out countercurrent reaction on the vinyl dimethyl chlorosilane and water, so as to generate a 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane crude product and hydrochloric acid; and S5, rectifying the crude product to obtain a pure product. The invention provides the preparation method of the 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane, which is high in atom economy and simple and convenient to operate, and meanwhile, the requirements of high selectivity, low environmental load and low cost are met.

The invention discloses a fluorescent probe for rapidly detecting acetylene, the fluorescent probe is a metal nanocluster solution, and the metal nanocluster solution has a fluorescence emission peak and is used for being in contact with acetylene to generate static fluorescence quenching. The invention further discloses a preparation method, the problems that an existing gas chromatography technology for detecting acetylene is long in consumed time, high in operation specialty and high in cost are solved, and the glutathione modified copper nanocluster solution has high sensitivity and linear response, can detect acetylene in a low concentration range (such as 0.26 nL / L-26000 mu L / L) and has a good linear relation. The stability of the GSH-Cu NCs solution is good, the probe solution can be stored for a long time, and the fluorescence lifetime is stable. The glutathione modified copper nanocluster solution has strong anti-interference capability, and the GSH-Cu NCs solution has the advantages of high detection speed, simple and convenient acetylene detection operation, low cost and no need of complex instruments, and is suitable for field use.

The invention provides a hybrid material for MOF confinement catalytic growth of nano silicon and a preparation method of the hybrid material, and relates to the technical field of batteries. According to the preparation method, collapse of a pore structure caused by severe decomposition is avoided through gradient temperature rise, ordered carbonization of an MOF framework is realized, a hierarchical porous carbon-based framework is formed, the MOF derived carbon framework has a three-dimensional porous structure, and the hierarchical structure better buffers silicon expansion stress; metal sites in MOF porous carbon catalyze silane decomposition, and oriented deposition of silicon atoms is achieved in sub-nano pore channels; the MOF confinement catalytic growth silicon nanowire / particle hybrid material is obtained through cooperation of pore structure design and catalytic growth, meanwhile, the selected MOF is rich in nitrogen element, nitrogen doping is achieved after carbonization, and therefore the electrochemical performance is improved; cracking acetylene (CH) to coat a carbon layer on the silicon surface and the porous carbon precursor to form a core-shell structure (Si (at) C); the silicon surface is passivated by the carbon layer, volume expansion in the charging and discharging process is inhibited, and the cycling stability is improved.

The invention aims to provide the in-situ online detection system for acetylene dissolved in oil for the oil immersed power transformer, and the in-situ online detection system can be directly mounted in an oil tank of the transformer, so that real-time, lossless and in-situ online monitoring on acetylene gas dissolved in oil is realized, and oil loss and pollution risks caused by oil sample extraction in a traditional detection mode are avoided. By introducing the micro photoacoustic spectrum acetylene gas sensor, high-sensitivity and high-selectivity acetylene gas detection is realized, and the acetylene gas sensor has the characteristics of being compact in structure, easy to install and free of maintenance. The system can rapidly and accurately monitor the operation state of the transformer, provides an important basis for preventing potential faults, and improves the operation reliability and safety of the power transformer.

The application relates to a catalyst for selectively hydrogenating nitrophenylacetylene to prepare aminophenylacetylene. The Fe2O3-CeO2 / TiO2 catalyst is used, the solvent is anhydrous ethanol, the hydrogen source is hydrazine hydrate, and the nitrophenylacetylene is catalytically hydrogenated to prepare aminophenylacetylene at 80-150 DEG C. The catalyst can realize efficient hydrogenation of the nitro group in the nitrophenylacetylene, the selectivity of the aminophenylacetylene can reach 94.8% when the nitrophenylacetylene is completely converted, the selectivity of the aminophenylacetylene is basically unchanged when the reaction time is continuously prolonged, and there is no accumulation of harmful intermediates such as phenylhydroxylamine in the reaction process.

The invention relates to the technical field of polycarbonate polyols, and discloses a preparation method of carbon dioxide-based polycarbonate polyols, which comprises the following steps: adding an epoxy compound, a carborane derivative catalyst, a chain initiator and a chain transfer agent into a reactor, introducing carbon dioxide to replace air in the reactor, and reacting to obtain the carbon dioxide-based polycarbonate polyols. Then pressurizing, heating and stirring to carry out polymerization reaction, adding acid to terminate the reaction after the reaction is completed, and then purifying and drying to obtain the polycarbonate polyol, wherein the carborane derivative catalyst is prepared by the following preparation method: adding different substituted alkynes, decaborane, ethyl sulfide and toluene into a reaction flask in proportion in a nitrogen atmosphere, sealing the reaction flask, and heating and stirring to enable the decaborane to react with the different substituted alkynes. According to the method, a specific catalyst is used for replacing a traditional catalyst, and the reaction efficiency and the product molecular weight can be improved.

The invention discloses a production method of a silicon-carbon negative electrode material, which adopts a production process route that hydrogen is used as carrier gas to charge silane, low-temperature hydrogen is used as carrier gas to charge acetylene for passivation, and high-temperature argon is used as carrier gas to charge acetylene for carbon coating, so that the existence of nitrogen during the existence of high-activity nano silicon is avoided, and an exothermic reaction causing explosion is eliminated; and the ton-level scale of single-furnace capacity is realized, and silicon-carbon negative electrode material products can be safely produced in batches.

The invention discloses a method for improving the selectivity of electrocatalytically reducing acetylene into 1, 3-butadiene by using a copper hydroxide hydrophobic nano array, which comprises the following steps: soaking a copper mesh in a mixed solution of NaOH and (NH4) 2S2O8 to obtain a Cu (OH) 2 self-supporting nano array, and then soaking in an ethanol solution of 1-dodecyl mercaptan to obtain a Cu (OH) 2 hydrophobic self-supporting nano array modified by 1-dodecyl mercaptan. A hot press is adopted to tightly press the dried hydrophobic self-supporting nano array and carbon paper to form a working electrode, a cathode chamber and an anode chamber are separated through an anion exchange membrane, electrolyte is composed of a KOH solution, and a peristaltic pump is used to enable a liquid phase to continuously circulate. According to the method, acetylene is subjected to electrocatalytic reduction to obtain 1, 3-butadiene by adopting a three-electrode system, and high-selectivity conversion of acetylene into 1, 3-butadiene is realized.

The invention discloses water-based ink with barrier property and a preparation process thereof, and relates to the technical field of water-based ink. Comprising the following components: modified acrylic resin, pigment, montmorillonite, a polyester type dispersant, an alkynediol wetting agent, an organic silicon composite defoaming agent, a low-viscosity modified siloxane flatting agent, an aziridine cross-linking agent and the balance of deionized water. Wherein perfluorobutyl, glycidyl ether oxygroup and hydroxyl are grafted on a molecular chain of the modified acrylic resin, the particle size of the montmorillonite is smaller than 500nm, and the radius-thickness ratio is larger than 50. The preparation process comprises the steps of nano clay pre-activation and pigment dispersion, reactive dispersion and resin grafting, low-temperature grinding and directional curing. According to the ink formula, the high-activity aziridine cross-linking agent and the flaky nano-clay filler are used in a matched mode in the modified acrylic resin, synergistic interaction is achieved through a specific formula proportion, the comprehensive barrier property of the ink is remarkably improved, and the OTR is reduced to 4.2 cc / m.day.

The invention discloses a detection method and a detection system for the cracking gas concentration of a transformer insulating material. The detection method comprises the following steps: performing headspace treatment on to-be-detected insulating oil to realize oil-gas separation in a sample; then the mixed gas is separated through a chromatographic column, the concentration of the dissolved gas is detected and analyzed through a mass spectrometry detector, and the cracking gas comprises at least one of methane, ethane, ethylene, acetylene, hydrogen, carbon monoxide or carbon dioxide. The method specifically comprises the following steps: preparing a to-be-detected insulating oil sample, and treating the to-be-detected insulating oil sample by adopting headspace to realize oil-gas separation in the sample; separating the mixed gas by adopting a chromatographic column, and then detecting and analyzing the dissolved gas by adopting a mass spectrometry detector; preparing a standard gas for dissolving the gas, establishing a calibration curve, and quantitatively calculating the concentration of the cracking gas through the calibration curve. The method can accurately detect methane, ethane, ethylene, acetylene, hydrogen, carbon monoxide and carbon dioxide gases, and has the characteristics of high detection sensitivity, good repeatability, simplicity and convenience and the like.

The application discloses a kind of metal organic framework materials and preparation method and application thereof, belong to chemical separation technical field.The preparation method of metal organic framework material provided in the application includes the following steps: with water and methanol as solvent, with 4,4 '-dipyridyl and malic acid as organic ligand, zinc source is added, and reaction is carried out, in the reaction process, oxygen atom on malic acid is connected with zinc ion on zinc source to form 2D layered network structure, 2D layered network structure is bridged by 4,4 '-dipyridyl to form 3D rigid network framework, after reaction, metal organic framework material is prepared.The metal organic framework prepared by the application has super strong capture effect and large storage space for acetylene molecules, and also has excellent separation effect on acetylene carbon dioxide mixed system, to achieve the purpose of high-purity, high-yield acetylene purification in acetylene carbon dioxide mixture.

A method for separating VdF and acetylene, the method comprising: a step for mixing a first mixture containing VdF and acetylene with an extraction solvent, which is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2, 3, 3-trifluoro-1-propene, to obtain a mixture for extraction; and a step in which the mixture for extraction is distilled to obtain a distillate having VdF as the main component and a bottom product having an extraction solvent as the main component and further containing acetylene, respectively.

The utility model relates to gas purification technical field especially is a calcium carbide method acetylene gas purification device, including washing tower, circulating pump, cooler and collector, the one side lower extreme of washing tower is installed for the acetylene pipe of air inlet, the top of washing tower is installed for the first connecting pipe of air outlet, the other end of first connecting pipe is connected in the one side lower extreme of cooler, and the other side of cooler is installed for the heat exchange pipe of cooling use, the top of cooler is installed with second connecting pipe, and the other end of second connecting pipe is installed with collector, and the top of collector is installed with the air pipe, in the utility model, integrated acetylene gas purification process, after entering washing tower, acetylene gas is fully washed through the multistage shower nozzle structure of inside back type setting, can effectively remove the alkali liquor and small impurities of entrainment, improve gas quality, and the cooler of cooperation setting can further reduce gas temperature and moisture content, improve the stability of subsequent reaction.

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The invention belongs to the technical field of cement kiln flue gas treatment, and particularly relates to a carbide slag cement denitration ammonia escape control and utilization system, and a modification method of the carbide slag cement denitration ammonia escape control and utilization system comprises the following steps: changing a drying crusher into an indirect dryer, indirectly exchanging heat between flue gas at an outlet of a preheater and carbide slag, and drying the flue gas at an outlet of the indirect dryer; a waste gas outlet of the indirect dryer is connected with an inlet of the ammonia gas absorption device, and an outlet of the ammonia gas absorption device is communicated with a drying medium outlet of the indirect dryer. The invention provides a carbide slag cement denitration ammonia escape control and utilization system.

This invention relates to the field of potting compound technology, and more particularly to a thermally conductive potting compound, its preparation method, and its application method. The invention provides a thermally conductive potting compound comprising component A and component B; component A, by weight, comprises: 24-28 parts of thermally conductive base adhesive; 0.7-1.0 parts of vinyl silicone oil; 0.05-0.15 parts of platinum catalyst; and 0.04-0.12 parts of colorant; component B, by weight, comprises: 24-28 parts of thermally conductive base adhesive; 0-0.4 parts of vinyl silicone oil; 0.8-0.9 parts of hydrogen-containing silicone oil; and 0.005-0.015 parts of inhibitor; the inhibitor includes ethynylcyclohexanol and / or methylbutynol. The thermally conductive potting compound provided by this invention has ultra-high thermal conductivity, low volatility and low viscosity, excellent mechanical properties, excellent electrical insulation properties, and superior storage stability, exhibiting no clumping or agglomeration after 6 months of storage.

The invention discloses a cone-ball coupled cavity photoacoustic gas sensor for detecting acetylene dissolved in transformer oil, relates to the field of testing or analyzing materials by using an optical means, and solves the problem that miniaturization and high sensitivity of an existing photoacoustic sensor are difficult to consider at the same time. An optical fiber collimator is arranged at one end of the shell, a sonic sensor is arranged at the other end of the shell, a buffer cavity, a first resonant cavity and a second resonant cavity are sequentially arranged in the shell between the optical fiber collimator and the sonic sensor, the end of the optical fiber collimator is located in the buffer cavity, and the center lines of the optical fiber collimator, the buffer cavity, the resonant cavities and the sonic sensor coincide. The buffer cavity is cylindrical, an air inlet and an air outlet are formed in the side wall of the buffer cavity, the first resonant cavity is in a circular truncated cone shape, and the second resonant cavity is in a segment shape. The buffer cavity, the first resonant cavity and the second resonant cavity are coupled to form a cylindrical-conical-spherical coupled cavity, so that limitation and focusing of acoustic energy are realized, and the amplitude of a photoacoustic signal is enhanced.