31 results about "Tetrafluoride" patented technology

The invention discloses a high-temperature oxygen-free plasma stress release method for a PCB pattern electroplating clamping film. The method comprises the following steps: carrying out primary film stripping treatment on a PCB subjected to pattern electroplating; the PCB with the film clamping residues after film stripping is placed in plasma processing equipment; an oxygen-free plasma system is adopted for treatment, and the plasma system comprises mixed gas of carbon tetrafluoride and inert gas; the plasma treatment parameters are controlled as follows: the radio frequency power is 4000-5000 w, the treatment air pressure is 50-200 pa, and the treatment time is 10-15 min; and after the plasma treatment is completed, secondary film stripping treatment is carried out. The problems that in the prior art, pattern electroplating clamping film is abnormal, and the removing efficiency is poor are solved.

The application belongs to the field of chemical purification, and discloses a method for separating carbon tetrafluoride in nitrogen trifluoride by using a eutectic solvent under pressure and an equipment thereof, which comprises the following steps: (1) increasing the pressure of crude nitrogen trifluoride gas to more than 0.5 MPa; (2) cooling the temperature of the crude gas to below 40 DEG C through a crude gas feeding heat exchanger; (3) reducing the content of carbon tetrafluoride in the crude gas to below 5 ppm by countercurrent contact between the crude gas entering the tower kettle and the eutectic solvent entering the top of the absorption tower through the absorption tower; (4) reducing the content of carbon tetrafluoride in the eutectic solvent to below 1 ppm through two-stage flash tanks; and (5) reducing the temperature of the eutectic solvent to below 30 DEG C through a eutectic solvent discharging heat exchanger and a eutectic solvent cooler, and circulating the eutectic solvent from the bottom of the absorption tower back to the absorption tower. The method can improve the quality of the nitrogen trifluoride product, and the content of carbon tetrafluoride impurities in the nitrogen trifluoride product can be reduced to 5 ppm, and the cost is low.

The invention discloses a preparation method and application of an in-situ copolymerized PIM-pillararene composite membrane, a tetrahydroxy-containing compound and a tetrafluoro-containing compound are used as reaction monomers, a precursor matrix is synthesized by adjusting the proportion of the tetrafluoro-containing compound, and then a mixed matrix polymer is obtained by in-situ doping of polyhydroxy pillararene. Dissolving a polymer in an organic solvent to obtain a membrane casting solution; and coating a solvent-resistant substrate with the membrane casting solution, and drying in a drying oven to obtain the composite membrane with high separation performance. Fluorine groups in a PIM matrix and hydroxyl groups on cyclic polyhydroxy aromatic hydrocarbon molecules are subjected to chemical cross-linking reaction to enhance the porosity of the polymer and increase the specific surface area, and column aromatic rings are introduced to promote adsorption of guest molecules, so that rich high-performance transmission channels are formed. On the basis of PIM synthesis, a polyhydroxy pillar arene compound is further introduced, the membrane stability can be improved through a rich net structure, and the separation performance of common organic solvents is remarkably improved.

The invention discloses a corrosion-resistant composite material for an industrial ton bag and a preparation method of the corrosion-resistant composite material. The preparation method of the composite material comprises the following steps: firstly, carrying out plasma activation treatment on polypropylene fibers to improve the surface activity of the polypropylene fibers, then immersing the polypropylene fibers into a graphene oxide dispersion liquid, carrying out drying and heat setting to form a graphene reinforced support layer, and then carrying out plasma etching through carbon tetrafluoride and oxygen to construct a micro-nano dual-scale structure on the surfaces of the fibers so as to obtain the graphene reinforced composite material. And finally, performing high-pressure emulsification on fluorinated polyolefin emulsion containing polyethylene, fluoroelastomer, nano silicon dioxide and the like, blade-coating the surface of the fiber with the emulsified fluorinated polyolefin emulsion, and performing hot-pressing compounding. Through multi-layer synergistic modification, the mass change rate of the composite material in a strong acid and strong alkali environment is lower than 1%, the strength retention rate exceeds 89% after ultraviolet aging for 500 h, the peel strength reaches 8.2 N / 25 mm, the composite material has excellent corrosion resistance, aging resistance and interface bonding force, and the service life of the ton bag in a severe environment is effectively prolonged.

The application provides a two-dimensional nanosheet film material, a preparation method thereof, a permeation energy power generation film material and an application thereof. The preparation method comprises the following steps: preparing an intermediate film material by suction filtration through two-dimensional nanosheets, and performing plasma treatment on the intermediate film material to obtain the two-dimensional nanosheet film material; wherein the ionized gas used in the plasma treatment comprises at least one of air, oxygen and carbon tetrafluoride; in the plasma treatment, the flow rate of the ionized gas is 0.5-30 slm, and the ionization power is 10-500 W. The application further provides the two-dimensional nanosheet film material obtained by the above preparation method, a permeation energy power generation film material comprising the two-dimensional nanosheet film material or prepared from the two-dimensional nanosheet film material, and an application of the permeation energy power generation film material. The above preparation method is simple in process, safe and reliable, and high in operability; the two-dimensional film material prepared has high output power, and has wide industrial application prospect.

This invention relates to the field of membrane separation, specifically to a membrane separation system and method for removing nitrogen from carbon tetrafluoride. The invention creatively connects two complementary membranes—a highly permeable, moderately selective organic membrane and a highly selective, moderately permeable molecular sieve membrane—in a two-stage series configuration via an intelligent composition analysis and control unit. The permeate composition of the first-stage membrane is the key control point determining the final separation performance. Only when the carbon tetrafluoride concentration is precisely controlled within 90-92% can the second-stage highly selective membrane achieve maximum efficiency, thereby simultaneously achieving ≥99.0% purity and ≥95.0% recovery rate.

The invention discloses a catalyst for cracking hexafluoroethane in crude carbon tetrafluoride gas, a preparation method of the catalyst and a carbon tetrafluoride production device and method. The catalyst comprises a carrier, active metal and a structural aid. The carrier is gamma-Al2O3, the specific surface area is 180-250 m / g, and the particle size is 3-5 mm; the active metal is one or more of nickel, copper, iron, cobalt and the like, and the loading capacity is 15-20wt%; the structural additive is selected from one of magnesium, calcium or strontium, and the loading capacity is 0.5-2.5%. The catalyst is prepared by dipping the alkaline earth metal auxiliary agent, roasting, then introducing active metal, aging, drying, reducing and carrying out fluorination activation, and is applied to deep cracking of CF4 crude gas. The purity of the cracking gas is more than 99% after the cracking gas is subjected to water washing, alkali washing and drying. The catalyst has the advantages of high activity, long service life and the like.

The utility model provides an industrial carbon tetrafluoride tail gas recovery processing device which comprises a bottom plate, an absorption tank, a plasma processing part and a post-processing part are arranged on the bottom plate, an input pipe is arranged on the lower portion of the absorption tank, a first control valve and a flow meter are arranged on the input pipe, an adsorption box is arranged at the upper end of the input pipe, and a second control valve is arranged at the lower end of the adsorption box. A tail gas inlet pipe is arranged at the upper part of the adsorption box, a gas inlet pipe and a liquid discharge pipe are arranged on the side surface of the absorption tank, and a second control valve is arranged on the gas inlet pipe. According to the industrial carbon tetrafluoride tail gas recovery treatment device provided by the utility model, impurities in tail gas, carbon tetrafluoride gas, part of organic pollutants and the like are subjected to adsorption, plasma treatment reaction and other impurity removal through multiple times of impurity removal, so that the tail gas is better treated and absorbed; and meanwhile, the plasma treatment part and the post-treatment part are used for detecting and refluxing the discharged gas, so that the concentration of carbon tetrafluoride in the discharged gas does not exceed the qualified standard.

The invention relates to a preparation method of a probe surface coating of an MEMS probe card. The preparation method comprises the following steps: 1) fixing a metal probe in a deposition chamber of a three-dimensionally rotatable magnetron sputtering tool; (2) introducing inert gas into the deposition chamber, and applying direct-current negative bias to remove pollutants on the surface of the probe; (3) applying negative bias voltage in a pulse mode; (4) sputtering and depositing a metal and silicon composite coating in an inert gas atmosphere; (5) introducing acetylene, applying negative bias to deposit a high-hardness diamond-like carbon layer on the surface of the composite coating, and synchronously introducing carbon tetrafluoride; (6) continuously increasing the flow of carbon tetrafluoride and reducing the flow of acetylene; (7) stopping introducing acetylene when the flow of the carbon tetrafluoride reaches 120sccm and the refractive index is less than or equal to 1.8; (8) switching off the power supply, introducing inert gas for temperature control cooling, and taking out the probe after cooling to room temperature; and (9) stripping the coatings of the probe head and the probe tail, so that the conductivity of the probe is not influenced.

The invention relates to the technical field of tail gas absorption and recovery, in particular to a hydrogen fluoride tank car vented tail gas absorption and recovery system and method, and solves the problems that some hydrogen fluoride tank car vented tail gas absorption and recovery devices are single in structure and prone to causing insufficient tail gas absorption and purification. The absorption tank is fixedly installed on one side of the supporting table in a penetrating mode, the side, close to the bottom end, of the absorption tank is connected with an air inlet pipe in a penetrating mode, a spraying pipe which is annularly arranged is installed in the absorption tank and located above the air inlet pipe, and the bottom end of the spraying pipe is connected with a plurality of atomizing nozzles in a penetrating mode. Alkaline washing liquid is sprayed into the absorption tank through the atomization spray head, so that the alkaline washing liquid is in full contact with HF-containing tail gas flowing upwards, HF is neutralized, the neutralized gas continues to flow upwards and is adsorbed through a filler plate and activated carbon in the top seat, and the absorption effect is improved. Therefore, residual tetrahydrogen fluoride and hydrogen fluoride gas in the tail gas can be fully absorbed and purified.

The application belongs to the technical field of sulfuric fluoride preparation method, and particularly relates to a method for continuously preparing sulfuric fluoride in a fluidized bed, which comprises the following steps: S1, using carbon tetrafluoride as a working gas, adopting plasma pretreatment on a hydrogen fluoride-amine complex for standby; S2, preheating the fluidized bed to 150-180 DEG C, adding fluorinated salt powder and the pretreated hydrogen fluoride-amine complex into the fluidized bed, and heating to 190-200 DEG C; after gasification, preheating sulfuric chloride to 100-120 DEG C, and then introducing into the fluidized bed for two-stage heating reaction; S3, gas-solid separation, washing and drying the gas, and thus sulfuric fluoride is obtained. The application combines plasma treatment with the fluidized bed, improves the synthesis efficiency, reduces the generation of by-products, and improves the product purity.

The application provides a method for decomposing carbon tetrafluoride, comprising the following steps: flowing the carbon tetrafluoride-containing gas to be treated through mesoporous aluminum in a low-temperature plasma field for decomposition treatment; wherein the oxygen concentration in the carbon tetrafluoride-containing gas is less than or equal to 10%; the mesoporous aluminum is arranged in a discharge area of the low-temperature plasma field; and the mesoporous aluminum is an amorphous aluminum isopropoxide material with a wormhole structure on the surface. The application can solve the problem of low efficiency of decomposing carbon tetrafluoride in the prior art, and has a wide application prospect.

The application discloses a gas chromatography valve path system for analyzing the content of nitrogen trifluoride gas in carbon tetrafluoride and a use method thereof, and comprises one ten-way valve, one quantitative ring, three chromatographic columns and one detector, and comprises the following steps: (1) setting a valve event 0 min on the gas chromatography workstation, the state of the ten-way valve is "off", and carbon tetrafluoride sample gas enters a recovery pipeline; (2) setting a valve event 5 min on the gas chromatography workstation, the ten-way valve is "on", and the carbon tetrafluoride sample gas can enter the detector to analyze the peak. The method solves the problems of great operation difficulty, inaccurate measurement, and incomplete separation of the main component carbon tetrafluoride and the impurity component nitrogen trifluoride in the prior art, the valve path system is clear, the operation is simple and convenient, and the analysis is accurate.

The invention belongs to the technical field of preparation of thickeners, and particularly relates to a preparation method of aluminum isooctanoate, which comprises the following steps: mixing and dissolving a catalyst functionalized heteropolyacid ionic liquid and a boron tetrafluoride ionic liquid, adding isopropanol into the mixture, introducing pure oxygen under reflux at 100-110 DEG C, stirring for reaction, extracting the reaction liquid with anhydrous ether for three times, merging organic phases, and concentrating to obtain the aluminum isooctanoate. Washing, drying and carrying out reduced pressure distillation to obtain isocaprylic acid; the preparation method comprises the following steps: heating isocaprylic acid to 60-70 DEG C, dropwise adding glacial acetic acid under a stirring condition, continuously heating to 140-150 DEG C, adding aluminum hydroxide, reacting for 6-8 hours, cooling after the reaction is completed, grinding, crushing, washing and drying to obtain aluminum isocaprylate. In the preparation process of the isocaprylic acid, the functionalized heteropolyacid ionic liquid is adopted as a catalyst, pure oxygen is adopted as an oxidizing agent, isooctanol is catalytically oxidized to be converted into the isocaprylic acid, and the functionalized heteropolyacid ionic liquid has the advantages of being good in catalytic effect and small in corrosion to equipment.

The invention discloses a carbon nanotube coating aging protection process, and belongs to the technical field of material protection. Comprising the following four core steps: gradient interface modification pretreatment, preparation of a double-structure inorganic protective layer, construction of a temperature-sensitive organic protective layer and interface synergistic reinforcement post-treatment. An interface reinforcement transition layer is constructed through argon, oxygen and carbon tetrafluoride mixed gas plasma treatment and aminated carbon quantum dot synergistic modification; the preparation method comprises the following steps: preparing a double-structure inorganic protective layer by combining magnetron sputtering and sol coating, constructing a temperature-sensitive organic protective layer by using a polyvinyl fluoride-acrylate copolymer containing a phase change microcapsule and a compound anti-ultraviolet agent, and finally promoting an inorganic-organic interface to form a Si-O-C covalent bond through ultraviolet-heat synergistic treatment. Through multi-step collaborative design, the problems that in a traditional technology, a carbon nano tube coating is single in protection function and rapid in aging failure are solved, the aging speed is reduced after treatment, and the heat conduction and spectral absorption core performance of the carbon nano tube is stably reserved.

The utility model relates to the technical field of gas washing bottles, in particular to a glass teflon gas washing device which comprises a gas washing bottle, a gas washing bottle cap is installed on the head portion of the gas washing bottle and comprises a connecting shell and a top shell, the top shell is installed on the upper end face of the connecting shell, the top shell and the connecting shell are integrally formed, and the gas washing bottle cap is installed on the connecting shell. Adjustable sealing covers are installed at the four ends of the top shell, the adjustable sealing covers are detachably connected with the top shell in a sealed mode, an exhaust pipe is further installed in the center of the top shell, and the exhaust pipe is fixedly connected with the top shell in a sealed mode. The gas washing bottle cap is mounted on the gas washing bottle, and the mounting grooves are formed in the four corners of the gas washing bottle cap, so that the adjustable sealing caps can be mounted through the mounting grooves, and the connecting through holes can be sealed and opened by mounting the adjustable sealing caps forwards and backwards during use; therefore, when the connecting through hole is opened, the connecting through hole can be externally connected with an air inlet pipe for use through the side hole of the adjustable sealing cover.

The invention discloses a carbon tetrafluoride catalytic hydrolysis method based on pulse water pumping, belongs to the field of environmental catalysis, and aims at solving the problems that traditional CF4 catalytic hydrolysis is high in water consumption and low in decomposition rate, and a catalyst is prone to inactivation. A pulse pump system containing a gas supply unit, a water vapor supply unit and a catalysis unit is adopted, after a catalyst is filled, parameters are set through a control system to achieve pulse intermittent water supply, mixed gas containing CF4 is introduced and heated, CF4 is subjected to catalytic hydrolysis under the action of the catalyst, tail gas is treated, and fluorine is recycled. According to the method, the CF4 decomposition rate can be increased to 99%, the service life of the catalyst can be prolonged to 50 h, water consumption is low, and the method is suitable for fluorine-containing tail gas treatment in the industries of electrolytic aluminum and semiconductors.

The invention relates to a gas collection device suitable for carbon tetrafluoride detection, comprising: a gas inlet device connected to a fluorine gas source; the reaction channel is fixedly arranged on the supporting frame and connected to the gas inlet device, the reaction channel comprises a channel body and a plurality of reaction vessels, one end of the channel body is provided with a gas dispersion mechanism, the gas dispersion mechanism comprises an upper row of vent holes and a lower row of vent holes, the bottom surface of the channel body is provided with a plurality of mounting ports side by side, and the plurality of reaction vessels are respectively arranged at the mounting ports; the driving devices are arranged on the supporting frame, the driving devices drive the reaction vessels to periodically ascend and descend in a staggered mode, after any reaction vessel descends by the driving device, the corresponding reaction vessel shields the air outlet holes in the lower row, and after any reaction vessel ascends by the driving device, the corresponding reaction vessel opens the air outlet holes in the lower row; the heating device is arranged below the reaction channel and is used for heating the reaction vessel; and the collecting device is connected to the other end of the channel body.

The invention provides a hydrophobic modification method for a polymer micro-fluidic chip runner, which comprises the following steps: firstly, etching the surface of a micro-fluidic chip by adopting oxygen and carbon tetrafluoride plasmas to roughen the surface of the micro-fluidic chip, and then, treating the surface of the micro-fluidic chip by adopting octafluorocyclobutane plasmas to hydrophobize the surface of the micro-fluidic chip. The method provided by the invention solves the problems of difficulty in realizing uniform hydrophobicity of the inner and outer surfaces of the chip, easy attenuation of effect, complex operation and difficulty in batch production in the existing method.

The invention belongs to the technical field of isotope, and discloses a preparation method of high-abundance silane isotope, which comprises the following steps: step 1, dissolving sodium aluminum hydride powder into a solvent according to the mass concentration of 7-10%, and filling into a reaction kettle; step 2, connecting the gas inlet end of the reaction kettle with a container filled with silicon-28 tetrafluoride gas, and connecting the gas outlet end of the reaction kettle with a silane collector; step 3, firstly closing a gas outlet end, controlling silicon-28 tetrafluoride gas to enter the reaction kettle through a gas inlet end at a fixed flow rate, maintaining stirring in the reaction kettle, controlling the temperature of the reaction kettle to be 10-70 DEG C, opening the gas outlet end when the pressure of the reaction kettle is increased to 0.1-0.5 MPa, and collecting silane-28 gas generated in the reaction kettle into a silane collector through negative pressure to complete one-time intermittent reaction; and step 4, repeating the operation in the step 3 until the molar ratio of the addition amount of the silicon tetrafluoride-28 to the sodium aluminum hydride in the step 1 is 0.5-1. The yield can reach 90% or above, the product purity is larger than or equal to 95%, and the silicon-28 abundance change before and after preparation is smaller than or equal to 1%.

The invention discloses a carbon tetrafluoride catalyst as well as a preparation method and application thereof, and belongs to the technical field of environment. Aiming at the problems of high reaction temperature, easy inactivation and insufficient efficiency of a traditional CF4 hydrolysis catalyst, the preparation method comprises the following steps: firstly preparing an Al2O3 nanosheet, and then sequentially loading Ga and Pt components through a step-by-step impregnation method to form the Pt-Ga / Al2O3 catalyst containing Pt-Ga double active sites. The catalyst can realize CF4 100% decomposition at 550 DEG C, is still stable after continuous operation for 100 hours, overcomes the industrial bottleneck of the traditional catalyst, and provides a feasible technical path for high-efficiency low-carbon treatment of fluorine-containing greenhouse gas CF4.

This invention discloses an iodonium salt photoinitiator and its application in the preparation of treatment-free CTP thermal printing plates. The general formula of the iodonium salt photoinitiator is shown in Formula 1, wherein R1 is a substituted or unsubstituted alkyl or substituted or unsubstituted alkoxy group having 2-9 carbon atoms, and R2, R3, R4, and R5 are independently hydrogen atoms, alkyl groups, halogens, hydroxyl groups, carboxyl groups, amino groups, alkoxy groups, ester groups, nitro groups, and are tetraphenylboron ions, boron tetrafluoride ions, boron hexafluoride ions, phosphorus hexafluoride ions, arsenic hexafluoride ions, tellurium hexafluoride ions, halide ions, perchlorate ions, acetate ions, or trifluorosulfonate ions. The iodonium salt photoinitiator with the structure of this application can be used to prepare treatment-free CTP thermal printing plates, and can improve digital imaging speed and reduce crystals in the precursor of the formed negative lithographic printing plate. At the same time, the prepared treatment-free CTP thermal printing plate has excellent imaging speed and printing durability.

This invention discloses an energy-saving electrolytic cell flue gas collection system, comprising main air ducts with different cross-sections and varying airflow designs, airflow regulating valves, pressure measuring ports, and differential pressure transmitters. The airflow regulating valves are installed in the exhaust duct of each exhaust hood. The pressure measuring ports are located at the air intake of each exhaust hood. Each pressure measuring port is connected to the differential pressure transmitter via a corresponding pressure measuring pipe. When the pressure difference of a certain exhaust hood exceeds the preset value of the differential pressure transmitter, the airflow regulating valve of that exhaust hood is adjusted accordingly to maintain a uniform negative pressure at all points within the exhaust hood. In this invention, pressure values ​​can be detected at each pressure measuring port, allowing for timely detection of excessively large gaps or improperly closed covers. An alarm can then prompt operators to make timely repairs. This ensures consistent negative pressure values ​​under each exhaust hood, thereby preventing the escape of harmful gases such as carbon dioxide and carbon tetrafluoride.

The present application relates to the field of semiconductor, specifically relates to a kind of semiconductor deposition cavity residue cleaning method, comprising the following steps: S3: setting deposition cavity cavity pressure 160-200Pa, 400-600sccm of carbon tetrafluoride is input and is ionized;S4: setting deposition cavity cavity pressure 40-60Pa, 400-600sccm of carbon tetrafluoride is input;S5: setting deposition cavity cavity pressure 160-200Pa, 400-600sccm of carbon tetrafluoride is input.The beneficial effects of the present application are that different reaction conditions of carbon tetrafluoride and SiO2 make SiO2 be reacted more fully.Carbon tetrafluoride different flow rate, with different intensity impact SiO2 on inlet hole, can make SiO2 be consumed in different forms;In addition, in the two changes of carbon tetrafluoride flow rate and impact force, form the mutation gas flow of carbon tetrafluoride flow rate mutation, mutation gas flow can make SiO2 be reacted more fully.

The invention relates to the technical field of environmental catalysis, and provides a preparation method of a needle-point-shaped aluminum oxide catalyst. According to the method, based on a gas phase transmission principle, an aluminum source and an ammonium source are jointly placed in a sealed container, ammonia gas and carbon dioxide released by slow decomposition of the ammonium source react with aluminum ions volatilized by an aluminum nitrate solution on a gas-solid interface, and a precursor is guided to grow directionally. The reaction product is subjected to water and ethanol alternate centrifugal immersion cleaning to remove impurities, and then is dried and controllably calcined in an air atmosphere to finally form the aluminum oxide catalyst with high specific surface area and specific needle tip morphology. Rich active sites can be exposed through the pinpoint-shaped morphology; hydroxyl on the surface of the aluminum oxide catalyst plays a key role in reducing a carbon tetrafluoride fluorocarbon bond fracture energy barrier. The catalyst is filled in a quartz reaction tube, and high catalytic activity can be realized at a lower temperature by virtue of optimized surface characteristics of the catalyst in a thermocatalytic hydrolysis reaction of carbon tetrafluoride, so that an efficient solution is provided for degrading strong greenhouse gases.

The invention relates to the technical field of refrigerants, and particularly discloses a refrigerant medium for preparing liquid nitrogen from refrigerants, the refrigerant medium is mixed with nitrogen in the refrigeration process, the nitrogen accounts for 34%-50% by mass, and the refrigerant medium accounts for 50%-66% by mass; the refrigerant medium comprises a first component and a second component, the mass ratio of the first component is 93%-99%, and the mass ratio of the second component is 1%-7%; the first component is methane, ethane, propane, iso-butane and carbon tetrafluoride; and the second component is any one of neon gas and helium gas. A refrigerant medium and nitrogen are mixed and run in the integrated equipment for preparing nitrogen through the refrigerant method, the cooling temperature is reduced to-180 DEG C, and the supercooling degree of liquid nitrogen is increased. Even if the temperature of the storage environment fluctuates, the liquid nitrogen at-180 DEG C can be kept in a liquid state, so that the volatilization loss is reduced, the storage cost is reduced, and the stable quality of the liquid nitrogen in long-term storage is ensured.

The utility model discloses a yarn spraying device for graphite tetrafluoride synthetic fiber processing, which belongs to the technical field of graphite tetrafluoride synthetic fiber processing and comprises a graphite tetrafluoride synthetic fiber pipeline, a connecting pipe is fixedly mounted on the outer side of the graphite tetrafluoride synthetic fiber pipeline, and a yarn spraying head movably abuts against the inside of the connecting pipe. Two groups of moving frames are slidably mounted in the connecting pipe, second moving blocks are slidably mounted in the two groups of moving frames, and second inserting blocks are fixedly mounted on one sides of the two groups of second moving blocks, so that the nozzle replacement process is simple and quick, complicated tools or tedious steps are not needed, the operation process is greatly simplified, the skill requirements on operators are reduced, and the working efficiency is improved. According to the spray head fixing device, the spray head can be easily replaced, the labor intensity of operators can be remarkably reduced, the operators do not need to spend a lot of time and energy to accurately adjust the position of the spray head for fixing, the springs can automatically complete the fixing work only by placing a new spray head at a proper position, and the operation convenience and efficiency are improved.

This invention belongs to the field of thickener preparation technology, specifically relating to a method for preparing aluminum isooctanoate. The method involves mixing and dissolving a catalyst-functionalized heteropolyacid ionic liquid and a boron tetrafluoride ionic liquid, adding isooctyl alcohol, and then refluxing at 100-110°C with pure oxygen while stirring. The reaction mixture is extracted three times with anhydrous diethyl ether, and the organic phases are combined, washed, dried, and distilled under reduced pressure to obtain isooctanoic acid. The isooctanoic acid is then heated to 60-70°C, and glacial acetic acid is added dropwise under stirring. The temperature is then further increased to 140-150°C, and aluminum hydroxide is added. The reaction is allowed to proceed for 6-8 hours. After the reaction is complete, the mixture is cooled, ground, washed, and dried to obtain aluminum isooctanoate. In the preparation of isooctanoic acid, this invention uses a functionalized heteropolyacid ionic liquid as a catalyst and pure oxygen as an oxidant to catalyze the oxidation of isooctyl alcohol to isooctanoic acid. The functionalized heteropolyacid ionic liquid has the advantages of good catalytic effect and low corrosivity to equipment.

The present application relates to photovoltaic cell packaging technical field, especially a kind of double-sided coating transparent backboard and preparation method thereof;Including the following steps: 1) PET substrate film single side coating;2) coating surface drying operation;3) plasma surface treatment: substrate film after drying in step 2) From oven to plasma processor, the surface of coating layer is carried out plasma grafting treatment;Mixing carbon tetrafluoride, nitrogen trifluoride, sulfur hexafluoride, bis (3-aminopropyl) polyethylene glycol, one or more of amino ether acid gas in nitrogen-based atmosphere as dopant gas;4) the transparent substrate film treated in step 3) From oven to winding device;5) PET transparent substrate B side coating treatment: the prepared substrate film B side is carried out 1) 2) 3) Same processing mode, finally obtain the double-sided coating transparent backboard;The present application has the advantages such as simple preparation process, economic and environmental protection, strong adhesion, good weather resistance, etc.

The utility model provides a gas purification device for thorium tetrafluoride preparation, which relates to the field of thorium tetrafluoride preparation and comprises a first treatment unit. Comprising a housing, a connecting cylinder fixedly connected to the bottom of an inner cavity of the housing, a connecting frame arranged at the upper end of the inner cavity of the housing, an activated carbon adsorption net arranged in an inner cavity of the connecting frame, and an HEPA filter net fixedly connected to the bottom of the connecting frame; the second treatment unit comprises a sleeve cover and a sealing cover movably connected to the top of the sleeve cover; dust and part of harmful gas in gas can be effectively adsorbed through the activated carbon adsorption net in the first treatment unit, tiny particles can be further filtered out through the HEPA filter net, the purity of the gas is ensured, moisture in the gas can be removed through the drying agent in the second treatment unit, the moisture is prevented from interfering with follow-up reaction, and the service life of the gas is prolonged. And the first treatment unit and the second treatment unit are tightly connected, so that the sealing performance of the gas is ensured, and the efficient purification of the raw material gas is realized.