96 results about "Tetramethylammonium hydroxide" patented technology

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 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 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.

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.

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 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.

A method for treating wastewater containing methanol, in which methanol is subjected to anaerobic treatment, is characterized in that organic nitrogen having 2-4 carbon atoms (excluding amino acids) is added. The organic nitrogen is at least one of tetramethylammonium hydroxide, trimethylamine and dimethylamine.

The invention provides a preparation method and application of a modified EP-POSS film, and relates to the field of molecular material synthesis. Comprising the following steps: dissolving KH560 in xylene to obtain a mixed solution 1; isopropanol and a tetramethylammonium hydroxide aqueous solution are mixed and stirred, and a mixed solution 2 is obtained; dropwise adding the mixed solution 1 into the mixed solution 2, stirring, refluxing, distilling, washing, drying and grinding one by one to obtain EP-POSS white powder; the preparation method comprises the following steps: activating a base material, dropwise adding EP-POSS onto the base material, finally preparing a fluorinated silane-toluene solution, and grafting fluorinated silane onto the surface of EP-POSS through a vapor deposition method to obtain the modified EP-POSS film. The contact angle of the prepared modified EP-POSS film is far larger than that of a common EP-POSS material, and the modified EP-POSS film has excellent hydrophobicity, light transmittance and thermal stability. In addition, the invention further provides application of the modified EP-POSS film to the photovoltaic module, the output power of the photovoltaic module can be remarkably improved, and the influence of long-time sunshine and dust covering on the output power of the photovoltaic module is reduced.

The application discloses a preparation method of a water-based developing solution, the water-based developing solution and application thereof, and belongs to the technical field of developing solutions. The preparation method comprises the following steps: a first amount of sulfuric acid is mixed with a second amount of isopropyl alcohol to obtain an isopropyl alcohol solution; tetramethylammonium chloride is mixed with the isopropyl alcohol solution according to a first preset proportion, a third amount of sulfuric acid is added, and the precipitate is filtered and dried to obtain white crystalline solid tetramethylammonium sulfate; the solid tetramethylammonium sulfate is dissolved in water, a suspension of barium hydroxide is added to the water, the reaction mixture is filtered, a tetramethylammonium hydroxide solution is obtained and purified; and the purified tetramethylammonium hydroxide solution is mixed with water according to a second preset proportion, and stirring is performed to obtain the water-based developing solution. The application aims to provide a water-based developing solution to solve the problem that the conventional developing solution in the form of an organic solvent is inconvenient to use in a chip developing process.

The present application relates to wastewater treatment technical field, specifically to a kind of wastewater treatment equipment and process for tetramethylammonium hydroxide production, including the treatment pool with gas main in pool, the top of gas main is equipped with aerator;Aerator includes base pipe, the top of base pipe is equipped with the rectifier plate that is hollow inside and is communicated with base pipe, both board surfaces of rectifier plate are equipped with rectifier hole communicated with the cavity inside rectifier plate;The top of base pipe is also covered with the aeration membrane cover that simultaneously covers rectifier plate entirely, aeration membrane cover and base pipe form aeration chamber communicated with rectifier hole on rectifier plate, the surface of aeration membrane cover is equipped with aeration hole communicated with aeration chamber;Rectifier plate is supported up from inside aeration membrane cover aeration membrane cover, and aeration membrane cover is divided into upper aeration zone and lower aeration zone, when gas is sprayed through aeration hole at lower aeration zone, it will float up, and it will drive aeration membrane cover vibration to carry out the blockage cleaning of aeration hole, and it will move to the upper aeration zone above to carry out aeration compensation.

The invention belongs to the technical field of photovoltaic module recovery, and particularly relates to a method for recovering silver from an out-of-service photovoltaic module. The method comprises the following steps: 1) disassembling a retired photovoltaic module, removing an aluminum frame and a junction box, and cutting the retired photovoltaic module into blocks by using an angle grinder; (2) putting the assembly into a muffle furnace, calcining at 500 DEG C for 1.5-2 hours, and removing the EVA adhesive film and the back plate to obtain toughened glass, a welding strip and a battery piece; 3) performing ultrasonic cleaning on the battery piece by using deionized water, airing the battery piece, placing the battery piece in a liner of a hydrothermal kettle, adding a tetramethylammonium hydroxide aqueous solution, and performing heating reaction at 80-100 DEG C for 0.8-1.2 hours to enable the silver grid line to be stripped from the surface of a silicon wafer; and 4) separating the silver grid line from the silicon wafer, respectively washing with absolute ethyl alcohol, and drying to obtain the silver grid line and the silicon wafer. According to the method, the low-concentration tetramethylammonium hydroxide aqueous solution is adopted, the silver grid line can be stripped and the aluminum electrode can be leached at the same time through heating at a relatively low temperature, and the residual silicon wafer is relatively complete.

The application discloses a method for reducing by-product azobenzene in RT-PCR condensation liquid, and the method comprises the following steps: inputting tetramethylammonium hydroxide, aniline, nitrobenzene and polyethylene imine type activated carbon into the condensation reaction; catalyzing the condensation reaction of aniline and nitrobenzene by the tetramethylammonium hydroxide to obtain a condensation liquid; separating the polyethylene imine type activated carbon and the condensation liquid; using the polyethylene imine type activated carbon for the condensation reaction; and preparing RT-PCR by catalyzing hydrogenation of the condensation liquid. The application greatly reduces the generation of by-product azobenzene in the condensation reaction by using the polyethylene imine type activated carbon, improves the selectivity of the condensation reaction, simultaneously reduces the absorption of carbon dioxide in the air by the system material, slows down the increase of tetramethyl carbonate, prolongs the catalytic life of the tetramethylammonium hydroxide, saves the raw material cost, and has a good application prospect.

The application belongs to the technical field of water treatment, and particularly relates to a phosphorus-containing modified magnetic chitosan microsphere, a preparation method thereof and application of the phosphorus-containing modified magnetic chitosan microsphere in treatment of chromium-containing underground water. Compared with the prior art, the phosphorus-containing modified magnetic chitosan microsphere provided by the application takes magnetic nanoparticles as a core, can be quickly separated from a reaction system by relying on external magnetic force of a system, and forms hydrogen bonds through hydroxyl groups of the magnetic nanoparticles and amino groups and hydroxyl groups of a chitosan molecular chain, so that stability and dispersibility of the magnetic nanoparticles are improved. Furthermore, a tetramethylammonium hydroxide solution is used as a crosslinking agent, so that a phosphorus-containing cationic group in the tetramethylammonium hydroxide is grafted on the chitosan molecule, thereby greatly enhancing adsorption performance of the chitosan on anionic heavy metal pollutants such as Cr(VI), and having long-term stability in remediation of Cr(VI)-contaminated underground water.

The invention relates to the technical field of gemini surfactants, and belongs to a gemini surfactant for developing a negative photoresist. The invention further discloses a developing solution, the developing solution comprises the gemini surfactant for developing the negative photoresist, the weight part of the gemini surfactant is 2-10%, and the developing solution further comprises 5-15% by weight of an alkaline substance and the balance of water. The alkaline substance is one of potassium hydroxide, tetramethylammonium hydroxide and tetraethylammonium hydroxide, the concentration of the alkaline substance is 8%-12%, and the concentration of the surfactant is 4%-8%.

The present invention relates to a cleaning composition and a cleaning method for a CMP process performed during the manufacturing process of a glass substrate-based Through Glass Via (TGV) structure. The cleaning composition comprises a quaternary ammonium salt, an alkanolamine, a glycol ether, an azole compound, a surfactant, and water. By including tetramethylammonium hydroxide and choline hydroxide as the quaternary ammonium salt in a specific ratio, the cleaning composition effectively removes polishing particles and organic residues remaining after the CMP process even under high alkaline conditions of pH 12 or higher, while suppressing excessive corrosion of the glass substrate and metal wiring, allowing the cleaning solution to penetrate uniformly into the high aspect ratio via, and simultaneously removing residual contaminants and preventing re-adsorption.

This invention relates to a method for preparing yttrium oxide with a large specific surface area. The method includes the following steps: S1, dissolving yttrium salt and adding tetramethylammonium hydroxide to precipitate; S2, washing with distilled water and centrifuging to dehydrate; S3, washing with ethanol and dehydrating; S4, adding diethylene glycol monobutyl ether and mixing evenly to form a paste; S5, calcining the paste formed in step S4 at a low temperature to form a powder; S6, adding anhydrous ethanol to the powder obtained in step S5 and ball milling; S7, drying. This invention uses tetramethylammonium hydroxide for precipitation, whose spatial structure reduces agglomeration. After washing, multiple washes with ethanol remove moisture, and then diethylene glycol monobutyl ether solution is added to form a paste, further reducing agglomeration during calcination. The calcination temperature is only 600-750℃, which is energy-saving and environmentally friendly. During ball milling, anhydrous ethanol is added, eliminating moisture during the process and reducing agglomeration. The yttrium oxide prepared by this method has a specific surface area of ​​100-200 m² / g. 2 / g.

The invention belongs to the technical field of chemical catalysis, and provides a preparation method and application of a modified MCM-22 molecular sieve catalyst. Unroasted MCM-22 (P) is used as a raw material, organic alkali (such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide or tetrabutylammonium hydroxide) is adopted for modification treatment, and then ion exchange and roasting are performed to obtain the hydrogen type modified molecular sieve. Organic alkali has the synergistic effect of alkali treatment and structure guiding, and the crystal phase purity and framework integrity are maintained while controllable desilicication is achieved. The catalyst is used for alkylation removal reaction of thiophenic sulfur in styrene, the selectivity of mono-substituted alkylation products is remarkably improved, and side reaction of styrene polymerization is effectively inhibited. The preparation method is simple, the catalytic performance is excellent, and the catalyst has a good industrial application prospect.

The invention discloses grape pomace pretreatment liquid and a method for preparing microcrystalline cellulose from grape pomace. The grape pomace pretreatment liquid is prepared from laccase, polygalacturonase, acetosyringone, sodium dihydrogen phosphate, disodium hydrogen phosphate, dithiothreitol, fatty alcohol-polyoxyethylene ether, sorbitol and the balance of water. The method for preparing the microcrystalline cellulose from the grape pomace comprises the following steps: S1, cleaning the grape pomace with normal hexane, then cleaning with water, drying and crushing; s2, carrying out mixed reaction with the pretreatment liquid, and then separating out pretreatment residues; s3, adding a sodium carbonate solution for premixing, then adding a tetramethylammonium hydroxide solution and a sodium borohydride solution, and filtering after reaction to obtain filter residues; s4, adding a citric acid solution, adding carboxymethyl chitosan, adsorbing, and filtering to obtain cellulose residues; and S5, hydrolyzing and depolymerizing by using dilute acid, neutralizing, separating and washing an acidolysis product, and drying to obtain the microcrystalline cellulose. According to the method, impurity components which are difficult to treat in the grape pomace can be overcome, impurity removal and purification are completed, cellulose is reserved to the maximum extent, loss is reduced, and the yield is remarkably increased while high-purity microcrystalline cellulose is obtained.

The invention belongs to the technical field of pharmaceutical analysis, and particularly relates to a method for detecting related substances of octreotide acetate. According to the method, high performance liquid chromatography is adopted, and a specific tetramethylammonium hydroxide-phosphoric acid buffer system is combined with an optimized gradient elution procedure, so that the technical problem that octreotide acetate and impurities with similar structures are difficult to separate is solved. The method comprises the following steps: adopting an octadecyl silane bonded silica gel chromatographic column; a buffer system with the pH value of 4.5-6.0 is prepared, a mobile phase A is tetramethylammonium hydroxide solution-acetonitrile, and a mobile phase B is tetramethylammonium hydroxide solution-acetonitrile; and carrying out gradient elution. According to the method, three specific impurities, namely [Des-Thr8-ol] OCTR, [N [epsilon]-Ac-Lys < 5 >] OCTR and [N [alpha]-Ac-D-Phe1] OCTR, can be simultaneously detected, the separation degree of the key impurity [Des-Thr8-ol] OCTR and a main peak is not less than 5.0, and baseline separation is realized. The method has the advantages of strong specificity, high sensitivity and good accuracy, and provides reliable guarantee for quality control of octreotide acetate.

The utility model discloses a biochemical treatment device for organic wastewater of a liquid crystal display panel, which comprises a reactor, porous aeration pipes are arranged on two opposite side walls of the reactor, and the porous aeration pipes are connected with an external aeration device; the porous aeration pipe comprises an aeration main pipe which extends vertically and a plurality of aeration branch pipes which are parallel to one another and extend transversely, and a plurality of aeration holes are formed in the aeration branch pipes; the reactor is filled with a porous filler and is provided with a fixed separation net for controlling the porous filler to be below the water surface at the initial stage of biofilm formation. According to the device disclosed by the utility model, on one hand, the reactor is in an aerobic environment by controlling the concentration of DO in the reactor, and meanwhile, an anoxic / anaerobic microenvironment can be constructed in filler pores, so that the thorough degradation of refractory organics such as tetramethylammonium hydroxide (TMAH) and a chelating agent in wastewater is realized; on the other hand, the fixed separation net is arranged in the reactor, so that the filler is in contact with wastewater and activated sludge at the beginning of the reaction, the biofilm culturing period of a biofilm on the filler is greatly shortened, and the reactor can be quickly started.

The invention discloses a method for deeply converting CO2 into acetaldehyde and crotonaldehyde, and belongs to the technical field of conversion of acetaldehyde and crotonaldehyde, and the method comprises the following steps: S1, taking one or a mixture of more of melamine, urea and dicyandiamide as a precursor, dissolving the precursor in an aqueous solution under a heating condition, and uniformly stirring until the precursor is completely dissolved; s2, adding one or more of deprotonation agents including triethylamine, isopropanolamine, 1-methylimidazole, n-butylamine, pyridine and tetramethylammonium hydroxide, mixing, and uniformly stirring; s3, placing in a hydrothermal reaction kettle, reacting under given temperature and time conditions, and cooling to room temperature; s4, carrying out centrifugal washing, drying and calcining to obtain polymeric carbon nitride with a crystal / amorphous interlaced interface; according to the method, other hydrogenation steps of the intermediate in the CO2 conversion process are inhibited, and on the basis of high yield and selectivity of acetaldehyde, C-C chain growth is further carried out to generate crotonaldehyde.

A substrate processing method according to the present invention includes: a substrate rotation step of rotating a substrate having a main surface ground or ground for thinning the substrate about a rotation axis perpendicular to the main surface; a first etching step of supplying a first etching solution containing hydrofluoric acid and nitric acid to the main surface during execution of the substrate rotation step; and a second etching step in which, after the first etching step, a second etching solution containing TMAH (tetramethylammonium hydroxide) is supplied to the main surface during the execution of the substrate rotation step. A second etching parameter applied in the second etching process is adjusted in such a way as to flatten a first surface profile generated in the main surface by the first etching process.

The present disclosure relates to a kind of UZM-8 molecular sieve and its preparation method, catalyst and application containing UZM-8 molecular sieve, the method includes: the raw material mixture containing silicon aluminum source, first template agent, second template agent and water is carried out hydrothermal crystallization reaction and recovers product;Wherein, the first template agent is at least one selected from tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, the second template agent is dimethyl diethyl ammonium hydroxide.Compared with the UZM-8 molecular sieve synthesized by traditional hydrothermal method, the UZM-8 molecular sieve with high crystallinity, high specific surface area and pore volume can be synthesized in the present disclosure, while the synthesis cost of molecular sieve is significantly reduced.

The present application relates to an environment-friendly water-based industrial anticorrosive coating and a preparation method thereof, and belongs to the technical field of coating. The coating composition comprises chloroether resin emulsion, corrosion inhibition emulsion, barrier agent, slag composite filler, etc. The corrosion inhibition emulsion is prepared by using hexamethylcyclotrisilazane, glycidyl furfuryl ether and 2-furfurylamine in isopropyl alcohol as raw materials and tetramethylammonium hydroxide as catalyst, and then emulsified with deionized water and composite emulsifier after removing isopropyl alcohol. The barrier agent is prepared by modifying the titanium aluminum carbide sheet layer after acid stripping with 3-aminopropyltriethoxysilane. The slag composite filler is prepared by sintering blast furnace slag powder, zeolite powder and potassium dihydrogen phosphate, etching with citric acid, and then modifying with boron nitride and KH-172 silane coupling agent. The coating uses water as the dispersion medium to reduce VOC emissions, and constructs a protective system in multiple dimensions through chemical active corrosion protection, physical layered barrier, dense film formation and interface covalent bonding, and is suitable for harsh corrosion scenes such as industrial heavy-duty corrosion, ships and marine engineering.

The invention belongs to the technical field of separation and purification, and particularly relates to a method for preparing tetramethylammonium hydroxide through underpotential electrolysis. The method is carried out in a diaphragm electrolytic cell and comprises the following steps: step 1, preparation of a capacitor electrode: sequentially carrying out roughening treatment and high-temperature activation treatment on a porcelain tube, and then carrying out chemical nickel plating to obtain the capacitor electrode which serves as an anode and a cathode at the same time; and 2, underpotential electrolysis: adding a tetramethylammonium bicarbonate solution into the anode chamber, adding a tetramethylammonium hydroxide solution into the cathode chamber, and then carrying out underpotential electrolysis reaction to obtain the tetramethylammonium hydroxide solution. According to the method, the tetramethylammonium hydroxide solution product is high in purity, and the operation cost is low.

The application relates to the technical field of semiconductor manufacturing, in particular to a silicon etching forming method for embedded packaging grooves; the silicon etching forming method for embedded packaging grooves takes a patterned silicon wafer as a base, takes tetramethylammonium hydroxide as an etching medium, takes a pH-responsive triblock copolymer as a morphology programming molecule, selectively anchors the silicon surface at the edge of a photoresist opening through covalent bonding, controls the molecular conformation by using the etching liquid, realizes in-situ continuous adjustment of the groove sidewall angle, realizes molecular recovery and residual removal through pH switching and RCA cleaning, and completes programmable etching forming of the embedded packaging grooves; the application realizes in-situ continuous adjustment of the groove sidewall angle of 60-90 degrees through covalent anchoring and pH control of the molecular conformation, combines a full-chain closed-loop process, solves the problems of fixed etching sidewall angle, high chemical consumption and difficult control of organic residues, and provides a high-precision and programmable solution for advanced packaging embedded groove etching.

The invention provides a preparation method of branched chain type modified vinyl silicone oil, which comprises the following steps: uniformly mixing tetramethyl tetravinyl cyclotetrasiloxane, hydrogen-based single-terminated polydimethylsiloxane and a dimethyl siloxane mixed ring body in proportion, adding a trace amount of platinum catalyst, and stirring for reaction to obtain a reaction liquid intermediate A; taking a certain amount of a dehydrated dimethyl siloxane mixed ring body, adding the reaction liquid intermediate A and an end sealing agent VM in proportion, uniformly mixing, adding a tetramethylammonium hydroxide alkali gel catalyst, stirring for reaction, and heating for breaking the catalyst to obtain a polymerization intermediate; and carrying out reduced pressure distillation on the polymerization intermediate to obtain the branched chain type modified vinyl silicone oil. The branched chain type modified vinyl silicone oil produced by the method is subjected to powdering performance evaluation, the branched chain type modified vinyl silicone oil can greatly improve the powdering efficiency of silicone oil and the leveling performance of a product, and the branched chain type modified vinyl silicone oil is applied to an electronic pouring sealant to replace part of vinyl-terminated silicone oil, so that the leveling performance and the powdering performance of the pouring sealant are improved.

The invention discloses an advanced treatment defluorination agent and a preparation method thereof, and the advanced treatment defluorination agent comprises the following components by mass: 5-8 parts of aluminum sulfate; 1-3 parts of polymeric ferric sulfate; 0.5-1 part of polyaluminum chloride; 1 to 3 parts of tetramethylammonium hydroxide; 1-3 parts of magnesium chloride; 0.1 part of hydrochloric acid; 0.1 part of a polyacrylamide cation; the deep treatment defluorination agent and the preparation method thereof have the advantages that the preparation is simple, the use is convenient, the operation cost is low, the concentration of fluorine ions in water can be quickly reduced through the adsorption precipitation effect, and meanwhile, the sludge yield is low, the adsorption is tight, and the sludge is not easy to float to the surface of a water body.

The invention discloses a method for recovering tetramethylammonium hydroxide from tetramethylammonium hydroxide developing solution waste water, which comprises the following steps: (1) adding concentrated hydrochloric acid into the tetramethylammonium hydroxide developing solution waste water, dropwise adding while stirring, adjusting the pH value to 2-5, and reacting for 2-4 hours; the photoresist in the wastewater is separated out while the tetramethylammonium hydroxide is converted into tetramethylammonium chloride, the separated photoresist is removed through suction filtration, and tetramethylammonium chloride suction filtration liquid is obtained; (2) concentrating the tetramethylammonium chloride suction filtration liquid obtained in the step (1) by utilizing an electrodialysis process to obtain an electrodialysis concentration chamber liquid; and (3) converting the electrodialysis concentrated chamber liquid into a tetramethylammonium hydroxide solution through a bipolar membrane electrodialysis process, and reducing chloride ion residues. According to the method disclosed by the invention, impurities in the wastewater can be effectively removed, the concentration of tetramethylammonium hydroxide is remarkably improved, and chloride ion residues are remarkably reduced.