203 results about "Tetramethylammonium hydroxide" patented technology

The invention relates to a preparation method of a high-precision gel injection pressureless sintering silicon carbide ceramic water jet cutter sand pipe, which comprises the following steps: pouring premixed liquid into a mold, and curing to obtain a green body; the inner mold is taken out of the cured blank, then the outer mold and the blank are put into a polyethylene glycol solution to be dried, the blank shrinks when being dried in the polyethylene glycol solution, and demolding is completed; drying the demolded green body on drying equipment, and carrying out vacuum heating to obtain a dried green body; and carrying out pressureless sintering on the dried blank to obtain the silicon carbide ceramic water jet cutter sand pipe. The premixed liquid comprises a monomer, a cross-linking agent, a dispersing agent, a defoaming agent, modified silicon carbide powder, a sintering aid and tetramethylammonium hydroxide, and the modified silicon carbide powder comprises graphene composite silicon carbide and modified carbon nanotubes. The water jet cutter sand pipe has the effect of improving the product quality of the prepared water jet cutter sand pipe.

The invention relates to the technical field of fabric waterproofing agents, in particular to a polyurethane modified organic silicon fluoride-free waterproofing agent and a preparation method thereof. The polyurethane modified organic silicon fluoride-free waterproof agent is prepared from the following raw materials in parts by mass: 5 to 15 parts of hexamethylene diisocyanate, 5 to 15 parts of butyl acrylate, 1 to 5 parts of methyl methacrylate, 40 to 60 parts of octamethylcyclotetrasiloxane, 10 to 30 parts of alpha, omega-dihydroxy polydimethylsiloxane and 5 to 10 parts of gamma-aminopropyl methyl diethoxy silane. The invention relates to a silane coupling agent, which is prepared from the following raw materials in parts by weight: 1 to 5 parts of glycidyl ether oxypropyl trimethoxy silane, 0.1 to 1 part of tetramethylammonium hydroxide, 0.1 to 1 part of triethylamine, 2 to 5 parts of tetraethoxysilane, 0.2 to 0.75 part of ammonia, 0.1 to 1 part of silane coupling agent KH-570, 0.01 to 0.1 part of dibutyltin dilaurate, 1 to 5 parts of epsilon-caprolactam, 1 to 2 parts of emulsifier and 0.1 to 1 part of initiator. The fabric treated by the method has good softness and excellent hydrophobic effect.

The invention provides a solid waste-based cementing material and a preparation method thereof, and relates to the technical field of solid waste resource utilization and cementing material preparation. The cementing material is prepared by mixing and grinding 60-80 parts by weight of modified phosphogypsum and 20-40 parts by weight of an auxiliary material, and the auxiliary material comprises at least one of steel slag powder, fly ash, lithium slag and mineral slag; a preparation method of the modified ardealite comprises the following steps: carrying out microwave treatment on ardealite for 0.5-1 hour, mixing the treated ardealite with aluminum oxide, attapulgite and sodium lignosulphonate, adding a tetramethylammonium hydroxide solution, and drying to obtain the modified ardealite. According to the solid waste-based cementing material disclosed by the invention, the phosphogypsum is modified, so that the solid waste-based cementing material has the characteristics of high strength, stable cementing, strong erosion resistance and the like while the mixing amount of the phosphogypsum is increased.

The invention relates to modified polyamide particles as well as a preparation method and application thereof, and belongs to the technical field of polyamide particles. The modified polyamide particle comprises the following components: polyamide resin, a modified composite filler, a compatibilizer, an antioxidant and a lubricant. The preparation method comprises the following steps: banburying and mixing the polyamide resin, the compatibilizer, the antioxidant and the lubricant, adding the mixture into a double-screw extruder from a main feeding port, adding the modified composite filler from a side feeding port, and carrying out melt extrusion, cooling and pelletizing to obtain the modified polyamide particles. Zirconium oxide is generated on glass fibers, more silane coupling agents are grafted in combination with a tetramethylammonium hydroxide and ethidene diamine compound catalyst, the interface bonding force between the composite filler and polyamide is increased, the surface of the composite filler is modified through syringaldehyde, the compatibility with a polyamide system is increased, and meanwhile, the composite filler can be used for preparing the composite filler. The modified polyamide particles can react with acid anhydride in a styrene-maleic anhydride copolymer, and the mechanical strength of the modified polyamide particles can be improved.

The invention discloses an alkaline medium-coarsening micro-etching solution as well as a preparation method and a micro-etching method thereof, and relates to the technical field of printed circuit board production. The alkaline medium-coarsening micro-etching liquid is prepared from the following components in mass concentration: 5-30 g / L of ammonium chloride, 0.5-2 g / L of tetramethylammonium hydroxide, 5-15 g / L of ammonia water, 2-10% of a catalyst, 0.1-1% of a wetting agent, 0.2-2% of an accelerator, 0.3-1.5% of a stabilizer, 0.5-5% of a color difference regulator and the balance of deionized water. The invention provides an alkaline medium-coarsening micro-etching solution and a preparation method and a micro-etching method thereof, which can solve the problem of color change of a board surface after micro-etching of a circuit board and overcome the defect that a sulfuric acid hydrogen peroxide micro-etching system is easily polluted by chloride ions, and can effectively improve the problem that hydrogen peroxide is easily decomposed by replacing sulfuric acid hydrogen peroxide with an alkaline substance. And the micro-etching rate is stable.

The invention discloses a preparation method of stable spray granulation silicon nitride slurry and granulation powder, and belongs to the technical field of ceramic materials. According to the invention, absolute ethyl alcohol is adopted as a solvent, so that the problem that silicon nitride slurry is easy to hydrolyze is solved, and the temperature during spray granulation is reduced. On the basis that a dispersing agent is added into slurry, tetramethylammonium hydroxide is added into the slurry, the Zeta potential value of the slurry is increased, the slurry is made to be in an alkaline environment, dissociation of Si-OH groups is promoted, more negative charges are carried on the surface of silicon nitride, meanwhile, zwitterions released by the tetramethylammonium hydroxide form a double-electron layer around silicon nitride particles, and therefore the conductivity of the silicon nitride particles is improved. The dispersity of the particles in the slurry is improved. The silicon nitride powder is more uniformly distributed in a medium such as a binder due to the improvement of the dispersibility, and the silicon nitride slurry with low viscosity, good dispersibility, good stability and good fluidity can be prepared. The slurry can be more symmetrically gathered and formed in the spray granulation process, and the sphericity degree and apparent density of granulation powder are improved.

The invention provides a method for synthesizing an MSE molecular sieve, and belongs to the technical field of molecular sieves. The invention uses tetramethylammonium hydroxide and tetrapropylammonium hydroxide as mixed template agents, stirs and mixes a silicon source, an aluminum source, sodium oxide, potassium oxide, a template agent and water, and then directly crystallizes, and then washes, dries and calcines to synthesize an MSE molecular sieve. The method for synthesizing an MSE molecular sieve provided by the invention does not require the addition of external crystal seeds, has easily available raw materials, is low in cost, and has simple steps, thus laying a foundation for further industrial production.

The invention discloses a UV photocuring adhesive, a preparation method thereof and an application of the UV photocuring adhesive in the electronic field, and relates to the field of adhesives. The preparation method comprises the following steps: when the UV photocuring adhesive is prepared, carrying out a reaction on dihydroxyl modified 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, p-phenylene diisocyanate, polyethylene glycol and 2-ethyl-4-methylimidazole, so as to obtain imidazole-terminated isocyanate, and carrying out a reaction on the imidazole-terminated isocyanate and the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the UV photocuring adhesive. The modified lignin, butanediamine and N, N '-methylene bisacrylamide are subjected to a reaction, and a double-bond reactant is prepared; the preparation method comprises the following steps: reacting epoxy-terminated siloxane with octamethylcyclotetrasiloxane, tetramethyltetravinyl cyclotetrasiloxane and tetramethylammonium hydroxide to obtain modified siloxane, and finally, uniformly mixing imidazole-terminated isocyanate, a double-bond reactant, modified polysiloxane and benzoin butyl ether to obtain the polyurethane adhesive. The UV light-cured adhesive prepared by the invention has good adhesive property, anti-aging property and flame retardant property.

The invention discloses an enhanced fluorinated silicone rubber composite material and a preparation method thereof in the technical field of rubber, and the enhanced fluorinated silicone rubber composite material is prepared from the following components in parts by weight: 60-70 parts of methyl vinyl cyclotetrasiloxane, 20-30 parts of methyl trifluoropropyl cyclotrisiloxane, 1-3 parts of tetramethylammonium hydroxide, 2-4 parts of benzoin dimethyl ether, 2-4 parts of 2, 2-(1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate) and 1-3 parts of 2, 2-difluoro-1, 3-pentanediol monoisobutyrate. The composite filler is prepared from the following components: carboxyl carbon nano tubes, tetraethoxysilane and 3-mercaptopropyltriethoxysilane, and the composite filler is prepared from the following components: the carboxyl carbon nano tubes, the tetraethoxysilane and the 3-mercaptopropyltriethoxysilane. The preparation method comprises the following steps: preparing the carboxyl carbon nano tubes from the carboxyl carbon nano tubes, the tetraethoxysilane and the 3-mercaptopropyltriethoxysilane; a carbon nanotube / silicon dioxide composite material is prepared, the composite material is modified through 3-mercaptopropyltriethoxysilane to obtain a composite filler, and the composite filler is added into polyfluorosiloxane to prepare the fluorosilicone rubber composite material, so that the mechanical property of the fluorosilicone rubber is improved.

The invention provides a method for preparing high-purity flaky alumina based on a hydrolysis method, and belongs to the field of high-purity flaky alumina powder. The method comprises the steps that metal aluminum scraps are pretreated; the method comprises the following steps: putting metal aluminum scraps, an alkaline organic matter catalyst and a morphology control agent into water, and carrying out a hydrolysis reaction at a set temperature for a set time to obtain a reaction mixed solution; carrying out solid-liquid separation, washing and drying on the reaction mixed solution to obtain flaky aluminum hydroxide; and roasting the flaky aluminum hydroxide to remove crystal water so as to obtain high-purity flaky aluminum oxide, wherein the alkaline organic matter catalyst comprises at least one of the following components: tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; the morphology control agent comprises at least one of ammonium bifluoride and ammonium fluoride. The preparation method disclosed by the invention is simple in process flow, free of an impurity removal process, mild in reaction condition, short in reaction time and free of environmental pollution, and the product is regular in shape and high in purity.

The preparation method is characterized by comprising the following steps: adding D3F and D4 into a polymerization reaction kettle together for dehydration, introducing vinyl by adopting a self-made cross-linking comonomer, adding a vinyl double-end-capping agent for end capping, adding tetramethylammonium hydroxide and an accelerant DMSO (Dimethylsulfoxide), and carrying out polymerization reaction at 120 DEG C for 1-2 hours in a normal-pressure nitrogen environment, so as to obtain the high-molecular-weight fluorosilicone copolymerized raw rubber. And raising the temperature to inactivate the catalyst, and removing the low temperature to obtain the fluorosilicone copolymerized raw rubber. According to the invention, D3F and dimethyl siloxane ring body are copolymerized, so that the cost is saved, vinyl-containing trifluoropropyl siloxane ring body is prepared, vinyl can be effectively connected into the fluorosilicone polymer, the distribution uniformity of vinyl in the main chain of the fluorosilicone polymer is improved, the vulcanization performance is improved, the chain back-bite phenomenon in the polymerization process can be effectively inhibited by adding the accelerant, and the service life of the fluorosilicone polymer is prolonged. The tetramethylammonium hydroxide catalyst is adopted, so that the neutralization step is omitted, polymerization and low molecule removal by heating are carried out in one reaction kettle, the operation is simple, and production and popularization are easier.

The invention discloses a special CMP (Chemical Mechanical Polishing) solution for a silicon carbide wafer. The special CMP solution consists of the following components: 5-12% of alpha-spherical nano aluminum oxide; 1-5% of a complexing agent, preferably citric acid; 0.1%-1.0% of a composite inhibitor; 0.5-3% of an oxidizing agent which is ammonium persulfate; 0.05%-0.5% of a dispersion stabilizer; the pH regulator is tetramethylammonium hydroxide and is used for regulating the pH of the polishing solution to 8-11; and the balance of deionized water or ultrapure water. The preparation method of the polishing solution comprises the following steps: S1, adding the alpha-spherical nano aluminum oxide into polyether polyol and ultrapure water, and carrying out ultrasonic dispersion; s2, adding a complexing agent, a composite inhibitor and an oxidizing agent, and magnetically stirring; s3, adjusting the pH (Potential of Hydrogen) to 8 to 11 by using a tetramethylammonium hydroxide solution; and S4, after standing at room temperature, filtering through a filter membrane to obtain the CMP polishing solution. The silicon carbide CMP polishing solution provided by the invention combines alpha-spherical nano aluminum oxide and an ammonium persulfate / PEG 6000 / composite inhibitor synergistic system, can ensure high material removal rate and low defect density, and has excellent dispersion stability and metal residue control ability.

Embodiments are directed to a method for minimizing electrostatic charges in a semiconductor substrate. The method includes depositing photoresist on a semiconductor substrate to form a photoresist layer on the semiconductor substrate. The photoresist layer is exposed to radiation. The photoresist layer is developed using a developer solution. The semiconductor substrate is cleaned with a first cleaning liquid to wash the developer solution from the photoresist layer. A tetramethylammonium hydroxide (TMAH) solution is applied to the semiconductor substrate to reduce charges accumulated in the semiconductor substrate.

The invention relates to a ceramic aerogel with a multi-scale heterostructure and a preparation method thereof, and the preparation method comprises the following steps: dipping carbon fibers in a reduced graphene oxide aqueous solution, and drying to obtain a Cf / RGO composite material; the preparation method comprises the following steps: by taking methyltriethoxysilane and dimethyldimethoxysilane as silicon sources, deionized water as a hydrolytic agent and tetramethylammonium hydroxide as a catalyst, mixing to obtain siloxane gel, and drying to obtain siloxane dry aerogel; and placing the Cf / RGO stacked layer by layer on the siloxane dry aerogel, carrying out high-temperature gas phase siliconizing to obtain a SiC / C composite fiber material, and carrying out air atmosphere heat treatment to obtain the layered hollow fiber skeleton based SiC-coated SiO2 nanowire aerogel. The aerogel disclosed by the invention has the characteristics of light weight, high temperature resistance, strong mechanical property and the like, collaborative optimization of mechanical-thermal-electromagnetic properties is realized, and a new thought is provided for cross-scale design of stealth materials under a high-temperature multi-physical field coupling condition.

The invention provides a chemical composition for removing etching residues, which comprises organic ammonium, a corrosion inhibitor, an organic solvent, an inhibitor, hydroxylamine and deionized water, the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide, and the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide; the inhibitor is selected from one or more of fructose, galactose, lactose, maltose, glucose, ascorbic acid, hydroxylamine sulfate and ethanol hydrazine. Compared with the prior art, the chemical composition for removing the etching residues can effectively remove the residues after plasma etching, meanwhile, etching of AlCu, TiN / Ti and silicon oxide is avoided, an operation window is large, and the chemical composition has good application prospects in the semiconductor etching process.

The invention discloses a method for reducing by-product N-methylaniline in RT base condensation liquid. According to the method, potassium hydroxide modified activated carbon is added in condensation reaction. The potassium hydroxide modified activated carbon greatly reduces the generation of a by-product N-methylaniline in a condensation reaction, reduces the absorption of carbon dioxide in air by system materials, slows down the increase of tetramethyl carbonate, prolongs the catalytic life of tetramethyl ammonium hydroxide, saves the cost of raw materials, and has a good application prospect.

The present application provides a method for preparing a Micro-LED device. The method improves the problem of sidewall damage caused by the use of dry etching to prepare Micro-LED grain structures. It is proposed to use a combination of tetramethylammonium hydroxide chemical corrosion and sidewall passivation to repair the sidewalls, which can completely etch the amorphous area of the Micro-LED sidewalls along the longitudinal direction, and has less destructive effect on the Micro-LED structure along the transverse direction. The sidewall lattice of the sample after etching is complete and the sidewalls are vertical. After the Micro-LED grains are formed, an optical evaluation method combining laser confocal microscopy and photoluminescence spectroscopy is used to evaluate their early performance. After packaging, the electrical performance of the Micro-LED device is tested, and the electrical performance test results are compared with the early luminescence performance evaluation. The present application can effectively process the Micro-LED sidewall damage layer, verticalize the Micro-LED sidewalls, and solve the problem of inconsistent areas of the upper and lower regions of the quantum well caused by the tilt of the sidewalls after dry etching.

The invention relates to the technical field of degumming agents, and discloses a preparation process of a degumming agent for a solar photovoltaic silicon wafer. The degumming agent comprises the following components in percentage by weight: 2-8% of tetramethylammonium hydroxide, 3-6% of organic alcohol amine, 0.5-1.5% of alkyl glycoside, 0.2-0.8% of a chelating agent, 0.5-3% of a functional additive and the balance of deionized water, the chelating agent is sodium gluconate; the functional additive comprises a sodium silicate corrosion inhibitor, a thickening agent and a penetrating agent; the preparation method comprises the following steps: S1, adding trimethylamine and epoxy chloropropane into tetrahydrofuran, carrying out stirring reaction at 60-65 DEG C for 8-15 hours, and removing a solvent to obtain a cationized intermediate; s2, adding the cationized intermediate into water, adding sodium carboxymethyl cellulose, uniformly stirring, heating and pressurizing to 120-130 DEG C, stirring and reacting for 8-12 hours, and removing the solvent to obtain the modified sodium carboxymethyl cellulose.

The invention discloses a method for preparing phycomycete aerobic granular sludge, belongs to the technical field of environmental engineering, and particularly relates to a method for preparing the phycomycete aerobic granular sludge by inoculating chlorella onto a mud-water mixture and carrying out granulation treatment. In the granulation treatment, semiconductor industrial wastewater is adopted for culture, and the content of tetramethylammonium hydroxide in the semiconductor industrial wastewater is 100-300 ppm. A sludge-water mixture is from aerobic sludge in an aerobic tank of a semiconductor industrial wastewater biochemical treatment unit, the aerobic sludge and chlorella are cultured by adopting semiconductor process wastewater, phycomycete aerobic granular sludge can be separated as required, and sewage treatment can be continued.

The invention discloses a functional polystyrene infrared stealth thin film material and a preparation method thereof, and belongs to the technical field of functional material preparation. The infrared stealth thin film material of the functionalized polystyrene is prepared from the following components in parts by weight: 53 to 67 parts of a substrate thin film material, 8 to 12 parts of modified polystyrene and 0.8 to 1.3 parts of an adhesive, the substrate thin film material is prepared from m-iodoaniline, trimethylsilylacetylene, diisopropyl xanthate disulfide, tetramethylammonium hydroxide, polyvinylidene fluoride and polymethyl methacrylate, and the modified polystyrene is prepared from syringaldehyde, n-butyl bromide, 2, 2 '-dipyrrolyl methane, 2-thiopheneboronic acid and polystyrene cross-linked microspheres. The infrared stealth thin film material of the functionalized polystyrene prepared by the method has excellent stealth performance and mechanical performance.

The invention relates to the technical field of wastewater treatment, and proposes a method for treating wastewater containing tetramethylammonium hydroxide, comprising the following steps: adjusting the pH value of wastewater containing tetramethylammonium hydroxide to 7-7.5, adding hypochlorite, sodium bicarbonate, sodium acetate and mesoporous silica, mixing, reacting, settling, and discharging water. Through the above technical scheme, the problem of low decomposition rate of tetramethylammonium hydroxide in the prior art is solved.

The application discloses a kind of high-temperature resistant photocuring 3D printing resin and preparation method thereof, belong to 3D printing technical field. Octamethylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane and hexamethyldisiloxane are ring-opening polymerized under the catalysis of tetramethylammonium hydroxide base glue, to obtain material A, with mercaptoethylamine hydrochloride in the presence of 2,2-dimethoxy-2-phenyl phenylacetophenone mercapto-alkene click reaction, after triethylamine treatment and purification, to obtain material B, with succinic anhydride and ring-opening amidation reaction, after purification, to obtain material C, with UiO-66 (Zr) in tetrahydrofuran and coordinate complex treatment, remove tetrahydrofuran, to obtain material D, add 1,6-hexanedithiol and 2,2-dimethoxy-2-phenyl phenylacetophenone, avoid light mixing and remove tetrahydrofuran under reduced pressure, to obtain high-temperature resistant photocuring 3D printing resin, improve the thermal stability of photocuring 3D printing resin.

This invention discloses a dyeing method for a PET aluminized film, which exhibits high color fastness and good steam resistance. The dyeing method for a PET aluminized film includes the following steps: Step (1), etching the PET aluminized film using tetramethylammonium hydroxide; Step (2), dyeing the PET aluminized film obtained in step (1) using an acidic medium dye; Step (3), fixing the color of the PET aluminized film obtained in step (2) using a color-fixing agent; Step (4), surface treating the PET aluminized film obtained in step (3) using a coating agent, followed by drying.

This invention relates to the field of spray system technology, and more particularly to an alkaline spray system for the production of ethyl chloroformate, comprising the following steps: S1, adding tetramethylammonium hydroxide to water, heating to room temperature, stirring until completely dissolved, adding modified sodium metasilicate, disodium ethylenediaminetetraacetate, and sodium lignosulfonate, controlling the temperature and stirring, filtering to obtain an alkaline solution; S2, turning on the power to the control system, ensuring the control system operates normally, setting the operating parameters of the spray system, starting the alkaline solution pump, drawing the alkaline solution from the storage tank, conveying it through pipelines to the spray heads, adjusting the pump's output flow rate, and starting intermittent, uniform spraying of the alkaline solution. The waste liquid after spraying flows through pipelines into a sedimentation tank for post-treatment. The alkaline spray system of this invention can significantly improve the purification efficiency of acidic gases, heavy metal ions, and organic pollutants in waste gas.

The invention relates to the technical field of ceramic materials, in particular to low-viscosity silicon carbide ceramic slurry as well as a preparation method and application thereof. The silicon carbide ceramic slurry comprises modified alpha-SiC powder and a dispersing agent, wherein the dispersing agent comprises tetramethylammonium hydroxide or a composition of tetramethylammonium hydroxide and octadecylamine polyoxyethylene ether. The powder modified by Al (NO3) 3 and sodium humate has better hydrophilicity, the zeta potential of the surface is negative, and sodium humate can be adsorbed on the surface of alpha-SiC powder to form steric hindrance to prevent aggregation and precipitation of the powder; the tetramethylammonium hydroxide is ionized in water, and generated OH <-> provides a strong alkaline environment for the solution, so that the Zeta negative potential on the surface is improved, and the agglomeration of the alpha-SiC powder is prevented. When octadecylamine polyoxyethylene ether is added, the octadecylamine polyoxyethylene ether can also be adsorbed on the surface of the alpha-SiC powder to form steric hindrance to prevent the powder from gathering and precipitating, so that the silicon carbide ceramic slurry with high solid content, low viscosity and stable performance can be obtained.

The present invention specifically relates to a method for preparing a S-rich porous zinc-based MOF flexible film. This method coordinates tetrazole with carboxyl groups and zinc ions via a hydrothermal method, using pyrazine as a template and tetramethylammonium hydroxide as a pH regulator. This yields a new S-rich porous zinc-based metal-organic framework material with special pores containing negative electrons. This material is further blended with a lithium salt and a polymer to produce a metal-organic framework composite polymer viscous liquid, which is then applied to a glass plate and allowed to stand to yield a S-rich porous zinc-based MOF flexible film. The present invention has the advantage of effectively enhancing the electrochemical and thermal stability of lithium batteries. The assembled lithium iron phosphate (LFP) battery exhibits low electrochemical impedance characteristics, with a specific capacity of 140 mAh g at a current of 0.1 C. ‑1 The capacity retention rate is close to 100%, showing excellent cycle stability and good rate performance at different current densities.

The invention relates to a [BMIM] Cl (at) MCM-41 catalyst and a method for synthesizing methyl trichlorosilane, the preparation method of the catalyst comprises the following steps: a) preparing an MCM-41 mesoporous molecular sieve by adopting a hydrothermal synthesis method, the specific method for preparing the MCM-41 mesoporous molecular sieve is as follows: taking cetyltrimethylammonium bromide (CTAB) as a template agent, taking tetraethyl orthosilicate (TEOS) as a silicon source, and adopting a hydrothermal synthesis method for preparing the MCM-41 mesoporous molecular sieve; the preparation method comprises the following steps of: mixing and stirring the MCM-41 molecular sieve serving as a raw material and tetramethylammonium hydroxide (TMAOH) serving as an alkali solution to form gel, dealcoholizing, crystallizing, washing, drying and calcining to obtain the MCM-41 mesoporous molecular sieve. The [BMIM] Cl (at) MCM-41 is used as the catalyst for synthesizing methyl trichlorosilane by a Grignard reagent method, the mesoporous structure of the MCM-41 improves the diffusion efficiency of reactants, and the structure is matched with the molecular size of the ionic liquid to form a uniformly dispersed active center and shorten the contact path of the reactants.

The invention provides a TMAH solution for removing a polycrystalline silicon layer, a preparation method and application of the TMAH solution and a back contact cell, and relates to the technical field of photovoltaic cells. The TMAH solution is prepared from the following components in parts by weight: 20 to 250 parts of tetramethylammonium hydroxide, 0.0005 to 6 parts of a main oxidant, 0.001 to 4 parts of an auxiliary oxidant, 3 to 5 parts of a main complexing agent, 2 to 3 parts of an auxiliary complexing agent, 0.001 to 0.5 part of a surfactant and 800 to 1200 parts of water. According to the invention, when the TMAH solution composed of a specific formula is used for corroding the N region, the bottom tunneling oxide layer is reserved, only the surface P-type polycrystalline silicon layer is removed, and side pits are reduced, so that side residues in subsequent procedures are reduced, side corrosion pits are reduced, subsequent residues are reduced, electric leakage is reduced, the yield is improved, and the conversion efficiency of a battery piece is improved.

The application provides a method for preparing methyl phenyl silicone oil by one-pot method, comprising: S100, carrying out hydrolysis reaction of phenyl dialkoxysilane selected from methyl phenyl dimethoxysilane and diphenyl dimethoxysilane and a chain extender selected from dimethyl cyclosiloxane and alpha, omega-dihydroxypolydimethylsiloxane in the presence of water and a first catalyst at a temperature of 40-90 DEG C, and carrying out first low boiling point removal treatment; S200, adding a second catalyst and reacting at 70-160 DEG C; S300, carrying out second low boiling point removal treatment to obtain methyl phenyl silicone oil; wherein the first catalyst and the second catalyst are each independently selected from tetramethyl ammonium hydroxide silanol salt and potassium hydroxide silanol salt; and the method further comprises: adding an end-capping agent before the hydrolysis reaction in step S100 or before adding the second catalyst in step S200.

The invention relates to the technical field of industrial solid waste resource utilization, in particular to a red mud activation method and a preparation method and application of a red mud-based cementing material. Aiming at the technical problems of low activity, serious scumming, high energy consumption and the like of the existing red mud cementing material, efficient activation of the red mud is realized through a three-stage transition activation mechanism. The cementing material is prepared by taking 80-85 parts of activated red mud powder and 15-20 parts of semi-hydrated phosphogypsum powder as main raw materials, and matching 50-60 parts of machine-made sand, 0.01-0.02 part of a water reducing agent, 2-4 parts of a composite alkali activator and 40-50 parts of water. Wherein the activated red mud powder is obtained through drying, ball milling, screening and medium-temperature thermal activation treatment at the temperature of 400-450 DEG C, and the semi-hydrated phosphogypsum powder is obtained through drying, ball milling, screening and drying treatment at the temperature of 150-200 DEG C. The composite alkali activator is composed of 50 wt% of tetramethylammonium hydroxide and 50 wt% of water glass with the modulus of 2.0. The activity of the red mud is improved from 40-50% to 90-100%, the 28-day compressive strength reaches 45-49 MPa, the scumming area is smaller than 0.1%, and an innovative solution is provided for bulk resource utilization of the red mud.