113results about How to "Avoid hydrolysis" patented technology

The invention provides modified aluminum nitride and a preparation method thereof, and the preparation method comprises the following steps: grinding a mixed material comprising aluminum nitride powder, a dispersing agent and an alcohol solvent to obtain nanoscale aluminum nitride powder with the particle size of 50-400 nm; the nanoscale aluminum nitride powder is subjected to first freeze drying treatment, and freeze-dried aluminum nitride powder is obtained; and mixing a solution containing dopamine with the freeze-dried aluminum nitride powder, and then carrying out second freeze-drying treatment to obtain the modified aluminum nitride. The method is helpful for improving the hydrolysis resistance of aluminum nitride.

The invention relates to the technical field of concrete, in particular to luminous pervious concrete and a preparation method thereof. The luminous permeable concrete is prepared from the following raw materials in parts by mass: 280-300 parts of cement, 870-900 parts of interval grading coarse aggregate, 70-80 parts of modified luminous powder, 30-40 parts of fly ash, 4-6 parts of a water reducing agent, 20-30 parts of a water repellent agent, 30-40 parts of epoxy resin, 3-5 parts of a silane coupling agent and 90-100 parts of water, and the interval grading coarse aggregate is prepared by mixing coarse aggregate with a small particle size of 4.95-9mm and coarse aggregate with a large particle size of 12.5-10mm according to a mass ratio of 1: 2; the surface of the modified luminescent powder is coated with silicon dioxide sol, and sodium borate is added for heat-resistant treatment. The light-emitting water-permeable concrete has compressive strength and water permeability, the light-emitting property is stable, and the hydrophobic and oleophobic corrosion resistance in the concrete is good.

The invention discloses an electrolyte of an aqueous zinc-iodine battery, and relates to the technical field of zinc-iodine batteries, the electrolyte is prepared from an I + stabilizer, a hydrogen bond ligand, a low-freezing-point hydrogen donor solvent and a zinc salt, and the molar ratio of the I + stabilizer to the hydrogen bond ligand to the low-freezing-point hydrogen donor solvent to the zinc salt is 1: 0.5: 5: 0.5-1.5. The invention also provides a preparation method of the electrolyte and a zinc-iodine battery prepared by using the electrolyte. The zinc-iodine battery constructed by the invention can realize highly reversible I- / I2 / I + conversion and rapid iodide conversion kinetics in a wide temperature range of-25 DEG C to 40 DEG C, and has high energy density and excellent long cycle stability. In addition, due to the unique solvation structure of the electrolyte, the activity of water molecules in the system is reduced, and then the hydrogen evolution reaction and other side reactions are inhibited. Therefore, the invention provides a feasible strategy for realizing wide temperature range, high capacity and high performance of the zinc-iodine battery.

The invention discloses a preparation method of tert-amyl peroxypivalate and an initiator, and belongs to the technical field of preparation of initiators. The preparation method comprises the following steps: by taking water as a solvent, when tert-amyl hydrogen peroxide and caustic soda liquid react to generate tert-amyl peroxide salt, the tert-amyl peroxide salt and pivaloyl chloride are subjected to substitution reaction to obtain the tert-amyl peroxide, and the substitution reaction speed of the pivaloyl chloride is higher than the hydrolysis speed of the pivaloyl chloride. Auxiliary materials are dispersed in an oil phase, shearing and emulsifying are carried out, the peroxide pivalate initiator is obtained, the auxiliary materials comprise an emulsifying agent, a dispersing agent, an anti-freezing agent and water, and the oil phase adopts the peroxide pivalate obtained through the method. The oil-phase raw material residue is low, and the storage stability time of the initiator emulsion prepared from the oil phase is longer than 30 months.

The invention relates to the technical field of selective impurity removal of valuable elements in acid solutions, in particular to a method for selective iron removal of rare earth pickle liquor. The method comprises the following specific steps: firstly, taking pickle liquor generated in an industrial production process, adding a first medicament, and stirring for pretreatment; adding a second medicament into the pretreated solution, and stirring to selectively remove iron; finally, a coagulant is added for solid-liquid separation, and supernate and iron-containing sediment are obtained. The total iron content in the supernate is lower than 5.0 mg / L, so that the production requirements of enterprises are met. The method has the advantages of simple and easy process, low equipment requirement, convenience in operation, wide application range and the like, and has good social benefits and economic values.

The invention discloses a catechol side group-containing polylysine derivative as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving catechol acid in an organic phase, firstly adding NHS, stirring and dissolving until the materials are uniformly mixed, then adding EDC.HCl, and stirring and reacting to obtain a catechol-NHS intermediate solution; (2) dissolving polylysine or a salt thereof in a water phase, and adjusting the pH value to 6.0-7.0 by using an alkaline solution to obtain a solution of polylysine or a salt thereof; and (3) adding the intermediate solution obtained in the step (1) into the polylysine or the salt solution thereof obtained in the step (2), and maintaining the pH value of the reaction system at 5.0-6.0 by using an alkaline solution to obtain the catechol side group-containing polylysine derivative. The preparation method is short in reaction time and mild in reaction condition, and the obtained product is high in grafting rate and high in raw material conversion rate and has a good application prospect in the aspects of tissue adhesives and the like.

The invention relates to a method for preparing pressureless sintered silicon carbide ceramics through gel injection molding, and relates to the technical field of ceramics, the method comprises the following steps: adding an organic phase into water, stirring and dissolving to obtain an organic phase solution, adding a cross-linking agent, a dispersing agent, a defoaming agent and a suspending agent into the organic phase solution, and stirring to obtain a premixed solution; adding the powder into the premixed liquid, and stirring to obtain slurry; carrying out ball milling treatment on the slurry, carrying out defoaming treatment after ball milling, and carrying out vibration treatment during defoaming, so as to obtain defoamed slurry; adding a catalyst and an initiator into the defoamed slurry, stirring, pouring into a mold, forming to obtain a green body, drying the green body according to a drying system to obtain a dried green body, and performing pressureless sintering on the dried green body to obtain a silicon carbide ceramic product. The silicon carbide ceramic has the effects of improving the density, hardness and drying performance of the silicon carbide ceramic, the strength of a green body can be effectively improved, and the phenomena of cracking and deformation are reduced.

The invention relates to the technical field of catalyst preparation, in particular to catalyst impregnation equipment and a catalyst impregnation method. The invention provides catalyst impregnation equipment and a supporting assembly. The supporting assembly comprises a bottom plate; the impregnation container assembly comprises an impregnation tank used for loading a catalyst carrier and impregnation liquid. After impregnation is finished, the impregnation tank is rotated, a gear ring can be meshed with a reciprocating thread groove formed in the outer wall of a lifting cylinder to drive the lifting cylinder to reciprocate and ascend and descend on the outer wall of a cylinder, external air is extruded into the impregnation tank, a circular tray is pushed to slide downwards on the inner wall of the impregnation tank, and an impregnated catalyst carrier and a residual solution are extruded; and when the catalyst carrier and the residual solution are extruded, the residual solution is filtered through the filter cotton and then flows out through the round holes and the outlet, so that the residual impregnated catalyst solution is effectively separated from the catalyst carrier.

The invention discloses a preparation method of environment-friendly plant-based transformer oil, and belongs to the technical field of high-temperature transformer oil. The lubricating oil comprises the following raw materials in percentage by mass: 1-8% of a viscosity index improver, 2-5% of an antioxidant, 0.05-0.2% of a demulsifying agent, 0.1-0.3% of an acid capturing agent and the balance of improved castor oil base oil. Various additives are added, so that the viscosity index and the oil-water separation capacity of the transformer oil can be improved, and hydrolysis can be inhibited; the castor oil is used as base oil, the transformer oil is endowed with degradability, and the castor oil base oil is improved, so that the flash point and breakdown voltage of the transformer oil can be improved; wherein the antioxidant and various groups in molecules can achieve a synergistic effect, so that the oxidation resistance of the transformer oil is remarkably enhanced; therefore, the prepared transformer oil is excellent in comprehensive performance, good in flash point, breakdown voltage and oxidation resistance and degradable, and has important application value in the technical field of high-temperature transformer oil.

The invention provides an oxytetracycline injection and a preparation method thereof, and belongs to the technical field of medicine preparation, the preparation method comprises the following steps: uniformly mixing 35-50 parts by weight of polyethylene glycol 400 and water, sequentially adding 0.4-0.6 part by weight of sodium formaldehyde sulfoxylate and 1.6-1.8 parts by weight of magnesium oxide, heating, adding 18-22 parts by weight of oxytetracycline, carrying out a complex reaction, adding monoethanolamine to adjust the pH value to 8.4-8.6, and uniformly stirring to obtain the oxytetracycline injection. And fixing the volume and filtering to obtain the oxytetracycline injection. The oxytetracycline injection prepared from the oxytetracycline can effectively improve the stability and the drug effect, prolong the half-life period of the drug and reduce the irritation.

The invention provides a preparation method of a perovskite thin film, and the method comprises the steps: providing an initial film layer which comprises a first surface and a second surface which are opposite to each other; a coating material is provided, the coating material comprises lead halide and a pore-forming agent, and the pore-forming agent has dehydration property; the coating material forms a porous lead halide framework layer with preset porosity on the first surface of the initial film layer through an evaporation process; coating one side, deviating from the initial film layer, of the porous lead halide framework layer with an organic amine salt mixed solution, and reacting to form an initial perovskite thin film; and performing first type annealing treatment on the initial perovskite thin film to form the perovskite thin film. By adopting the method, the film forming quality of the perovskite film can be effectively improved, and the electrical property of the solar cell can be ensured and improved. The invention also discloses a perovskite cell, a laminated cell and a preparation method thereof.

The invention provides a polyimide film and a preparation method thereof, and relates to the technical field of polyimide film preparation. The preparation method of the polyimide film comprises the following steps: adding aromatic diamine and aromatic dianhydride into a polar solvent, and reacting to obtain polyamide acid resin; adding a dispersing agent and carbon black into a polar solvent to obtain slurry; adding the slurry into polyamic acid resin, and then adding aromatic dianhydride to obtain a polyamic acid resin solution B; adding aromatic diamine into the polyamic acid resin solution B to obtain a polyamic acid resin solution C, adding aromatic dianhydride to obtain a polyamic acid resin solution D, and adding an end-capping reagent to obtain a modified polyamic acid resin solution E; performing defoaming, coating and solvent removal treatment on the solution E to obtain a gel film, and performing imidization treatment to obtain a polyimide film; the film prepared by the invention has low water absorption and excellent insulating property.

This invention belongs to the technical field of lithium battery anode materials, specifically relating to a highly conductive graphite electrode material and its preparation method. The preparation method includes: pre-dissolving sodium carboxymethyl cellulose into a gel solution, then ball-milling and mixing graphite and conductive carbon black, dispersing them together with a cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and hafnium diboride nanomaterials in the gel solution, adjusting the acidity, adding styrene-butadiene rubber emulsion to obtain a uniform slurry, and then coating, drying, and compacting to obtain the anode sheet. This invention significantly improves the conductivity and structural stability of the graphite anode through the synergistic effect of the interface modification of the cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and the conductive framework of the hafnium diboride nanomaterials. The process is safe and controllable, and suitable for industrial production of lithium-ion batteries.

The invention discloses an anti-oxidation high-strength glass fiber and a preparation method thereof, and relates to the technical field of glass fiber. The present invention uses glass fiber as raw material, first sequentially performs silver plating, deposition treatment, copper plating, and spraying treatment, obtains a foam conductive network structure containing piezoelectric particles, can convert sound into electric current, and then into a heat energy mode, dissipates it, and makes the glass fiber have sound insulation damping; then further modified using 2'-hydroxy-4' (3-methyl-2-buteneoxy) acetophenone, 2,3-dihydroxy-4-ethoxybenzaldehyde, phosphorus trichloride and decanoic acid, so that the surface has antioxidant properties, and effectively resists hydrolysis. The anti-oxidation high-strength glass fiber prepared by the present invention has the effects of sound insulation damping and long-lasting antioxidant.

The present invention relates to the field of lithium battery material preparation technologies, particularly to a method for preparing lithium iron phosphate using the by-product ferrous sulfate from titanium dioxide. The method comprises the following steps: adjusting the pH of water by adding sulfuric acid, then dissolving by-product ferrous sulfate from titanium dioxide in the water, and adding iron powder for stirring and reaction; adding iron phosphate or lithium iron phosphate waste powder to the solution, heating and stirring the mixture, allowing the mixture to settle and cool, and filtering the cooled mixture to obtain a purified ferrous sulfate solution; and adding phosphoric acid and a lithium hydroxide solution in a co-current manner in an autoclave, and finally adding the purified ferrous sulfate solution, heating the mixture under stirring, then filtering, washing, and drying the mixture to obtain lithium iron phosphate powder. In the present invention, during the purification of the ferrous sulfate solution, iron phosphate or lithium iron phosphate waste powder is used as a precipitant. The resultant ferrous sulfate solution has a titanium content of less than 10 ppm, with no impurity elements other than iron, phosphorus, and lithium introduced. The ferrous sulfate solution is used as an iron source for preparing lithium-ion battery positive electrode materials, and the material exhibits excellent electrochemical performance, achieving effective utilization of titanium dioxide by-products.

The invention relates to high-solid-content AlN ceramic slurry for tape casting, a substrate and a preparation method of the substrate, and belongs to the field of ceramic substrates. The ceramic slurry is prepared from the following components in percentage by mass: 60 to 68 weight percent of high-purity AlN powder, 3 to 6 weight percent of dispersing agent, 3 to 5 weight percent of binding agent, 4 to 6 weight percent of plasticizer, 3 to 6 weight percent of sintering aid and 32 to 45 weight percent of solvent, the mass ratio of the plasticizer to the binder ranges from 3: 5 to 4: 5. By regulating and controlling the proportion of the dispersing agent in the AlN ceramic slurry and the solid content of the high-purity AlN powder, the slurry has excellent flowability, dispersity and stability while maintaining high solid content, and is suitable for a tape casting process. The AlN ceramic substrate prepared through sintering is high in density and excellent in heat conductivity, and engineering application can be achieved.

The invention relates to a transformation method of isomaltulose, which comprises the following steps: (1) mixing a sucrose aqueous solution with sucrose isomerase, and stirring to react; (2) when the stirring reaction is carried out, sampling to detect the sucrose conversion condition, and adjusting the conversion temperature according to the detection result; and (3) ending the reaction when the sucrose conversion rate is greater than or equal to 98%. According to the method, high-purity conversion of isomaltulose is achieved by presetting the temperature change program, generation of by-products is greatly reduced, conversion equilibrium is promoted by variable-temperature conversion to incline towards isomaltulose, the product conversion rate is higher, and meanwhile generation of side reactions and hydrolysis of cane sugar are avoided as much as possible.

The invention discloses a preparation method of a 2-cyano thiophene compound, which comprises the following steps: taking a compound shown as a formula I and a cyaniding reagent as raw materials, and carrying out cyaniding reaction in a mixed system of water and an organic solvent in the presence of a catalyst and a ligand to obtain a compound shown as a formula II, namely the 2-cyano thiophene compound, in the invention, the cyaniding reagent is wide in source, low in price, safe and stable, and the preparation method is simple and easy to operate; besides, combination of different ligands, catalysts and solvents has great influence on yield and purity, the high-purity 2-cyanothiophene compound II can be obtained through reasonable matching, cyano functional groups in the compound shown in the formula II are effectively inhibited from hydrolyzing to generate byproducts of a compound shown in a formula III (R groups in the formula III are the same as the formula II), and the yield and purity of the compound shown in the formula III are greatly improved. And the catalyst has the advantages of low dosage and high purity control in the intermediate process, and can be easily applied to large-scale production of the 2-cyanothiophene compound II.

The utility model discloses a water removal system for a reaction system. The water removal system comprises a reactor, a solvent storage tank, a constant-temperature heat tracing jacket, a stirrer, an oil-water separator, a gravity sensor, a condenser and a water collection tank, the gas phase outlet is communicated with an inlet of the oil-water separator through a pipeline, a gas phase outlet in the top of the oil-water separator is communicated with a gas inlet of the condenser through a pipeline, and a liquid outlet of the condenser is communicated with the inlet of the oil-water separator through a pipeline; a liquid phase outlet in the bottom of the oil-water separator is communicated with an inlet of the water collecting tank through a pipeline; and a water distribution switch is arranged at a liquid phase outlet of the oil-water separator. The solvent which does not participate in the reaction and has a boiling point similar to that of water is added into the reactor through the solvent storage tank, and the water can be discharged out of the reactor in time in the reaction process by utilizing the principle that the solvent and the water are azeotropic, so that the hydrolysis reaction is prevented, the pressure in the reactor can be prevented from being too high, the product yield can be improved, and the production cost is reduced. The usage amount of raw materials is further reduced.

This invention discloses a process for recovering germanium from germanium-silicon alloy waste, belonging to the field of germanium recovery technology. The process includes the following steps: S1. Oxidizing and roasting the germanium-silicon alloy waste to obtain roasted clinker; S2. Sulfidating and fixing the roasted clinker and pyrite to obtain activated clinker; S3. Leaching the activated clinker with sulfuric acid, followed by solid-liquid separation, and collecting the germanium-containing leachate; S4. Performing multi-stage countercurrent extraction on the germanium-containing leachate using an amine extractant to obtain a loaded organic phase; then back-extracting the loaded organic phase with an alkaline back-extraction solution to obtain a germanate solution; S5. Hydrolyzing and precipitating the germanate solution to obtain pure germanium dioxide. The roasting process of this invention fixes impurities and activates elemental germanium into soluble germanium dioxide. The purification stage efficiently separates germanium from other impurity ions, and the final hydrolysis precipitation controls product consistency. This invention's recovery process has high recovery efficiency and purity, is more environmentally friendly, and is expected to achieve large-scale production.

An object of the present invention is to provide a surface treatment agent that is excellent in antithrombogenicity and biocompatibility and has higher hydrophilicity compared to conventional medical materials. The present invention is an antithrombogenic material containing a (meth)acrylate copolymer consisting of a hydrophobic (meth)acrylate and a hydrophilic (meth)acrylate, in which the hydrophobic (meth)acrylate is a silicone (meth)acrylate and / or an alkyl (meth)acrylate, the (meth)acrylate copolymer having a residual monomer content of 4,000 ppm or less, a reduced viscosity (ηsp / c) of 0.18 dl / g or more and 3.00 dl / g or less, and being water-insoluble, and being a viscous liquid at room temperature.

The invention provides a flurbiprofen axetil injection and a preparation method thereof, and belongs to the technical field of biological medicines. According to the flurbiprofen axetil injection provided by the invention, oleic acid is used as a pH regulator to control the pH value of an injection preparation, hydrolysis of soybean oil and egg yolk lecithin can be inhibited, and egg yolk phosphatidyl glycerol (EPG) is added as a co-emulsifier, so that the encapsulation efficiency of an emulsion is remarkably improved, the quantity of flurbiprofen axetil free in water is reduced, and the stability of the injection is improved. The later-stage hydrolysis is obviously reduced. Therefore, the content of the flurbiprofen axetil injection provided by the invention is relatively stable, meanwhile, the quantity of the hydrolysate flurbiprofen is small, the relatively stable pH value of the preparation is ensured, the clinical safety and effectiveness of the preparation are ensured, and the validity period is not less than 2 years.

The application belongs to the technical field of sodium-ion battery cathode materials, and discloses a pyrophosphoric acid sodium iron phosphate composite material and a preparation method and application thereof. By regulating the microenvironment of chelation reaction, the chelation state of iron ions is optimized, iron ion precipitation is avoided, and the formation of electrochemically inert impurities is inhibited. Meanwhile, graphene oxide constructs a three-dimensional conductive network to improve the electronic transmission capacity of the material. The pyrophosphoric acid sodium iron phosphate composite material prepared by the application has small particle size, uniform dispersion, no inert impurities and is tightly coated by the conductive network. The material has a discharge specific capacity of 120.9 mAh·g ‑1 at 0.5 C, still maintains a reversible capacity of 78.1 mAh·g ‑1 at 20 C high rate, and has a capacity retention rate of 84.9% after 1000 cycles, and the full battery assembled with the hard carbon negative electrode also exhibits excellent rate and cycle performance.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

The invention provides a preparation method of bio-based composite polylactic acid fibers, and relates to the field of biomass conversion materials and composite polylactic acid fibers.The flexible hydrogen conveying pipe is prepared from polylactic acid, polyester fibers, graphene fibers, natural plant fibers, jasmine extract, carbodiimide, triacetic acid and acetyl tributyl citrate. The natural plant fibers comprise linen fibers, natural corn fibers and wormwood fibers which are microfibers; according to the preparation method disclosed by the invention, the interface compatibility of the natural plant fibers and the polylactic acid is improved after the natural plant fibers are integrally modified, the physical and mechanical properties of the finally prepared bio-based composite polylactic acid fiber material are enhanced, and various properties of the prepared bio-based composite polylactic acid fiber material are in higher standards in the composite polylactic acid fibers.

This invention belongs to the field of metal rust prevention technology, specifically relating to an environmentally friendly water-based rust-preventive composition, its preparation method, and its application. The composition comprises, by weight, 3-8 parts of a first triazine compound, 1-5 parts of a second triazine compound, 10-20 parts of 2-amino-2-methyl-1,3-propanediol, 2-5 parts of dipropylene glycol monomethyl ether, and 65-85 parts of water. The first triazine compound is a triazine compound having substituents containing hydrophobic segments and at least two aminocarboxylic acid substituents, and the second triazine compound is a triazine compound having thiol substituents. This invention forms a dual-anchored protective film on the metal surface through the two triazine compounds, exhibiting excellent salt spray resistance, damp heat resistance, and film density. It achieves a salt spray test duration of 72 hours, a damp heat test duration of 960 hours, and an adhesion rating of 0. Furthermore, it is free of nitrites, phosphates, and heavy metals. The preparation method is simple, suitable for industrial production, and can be widely applied to metal rust prevention in machinery manufacturing, automotive parts, and other fields.

The application discloses a traditional Chinese medicine composition set for treating lung diseases and a preparation method thereof. The traditional Chinese medicine composition set is composed of one to six independently packaged prescriptions, wherein the one to five prescriptions are oral dosage forms, and are respectively directed to cold cough and asthma, hot and real cough and asthma, virtual cough and asthma, lung cancer specificity and cancer advanced stage for systematic intervention; the sixth prescription is a plaster external application dosage form, and realizes internal and external combined treatment. The medicine liquid is uniformly and equally divided and stored by low-temperature freezing after being pressure-cooked for 20 minutes in a full-closed and zero-gas emission state by using an electric pressure cooker, and is taken by water separation and hot water. Clinical application shows that the application greatly improves the systematic treatment effect on complex lung diseases such as tuberculosis, tumors, lung cancer cough and asthma by the mode of six prescriptions cooperation and dynamic syndrome differentiation and treatment. The accurate closed decoction process perfectly retains volatile oil and weak stability alkaloids in the compound prescription, and effectively improves the stability and repeatability of the batch effect.

The invention discloses a preparation method of an efficient light-emitting silver-indium-sulfur and silver-indium-zinc-sulfur composite nano material, and belongs to the technical field of light-emitting nano materials and preparation. The preparation method comprises the following steps: by taking silver dibutyl dithiocarbamate, indium dibutyl dithiocarbamate and zinc carboxylate as precursors, uniformly mixing at a dodecane neutralization pretreatment temperature to form a mixed solution A; naturally cooling, adding dodecanethiol, and uniformly stirring and mixing to obtain a mixed solution B; at the reaction temperature, decomposing part of silver dibutyldithiocarbamate in the mixed solution B to generate silver sulfide clusters; the activity of the silver sulfide cluster is closely related to the size, the silver sulfide cluster is used as a seed to induce growth of silver-indium-zinc-sulfur, meanwhile, silver sulfide is converted into silver-indium-sulfur, finally, the silver-indium-sulfur and silver-indium-zinc-sulfur composite nano material is obtained, the band gap is 2.0-2.8 eV, the luminous efficiency is 52% or above, and the luminous efficiency can still be kept at 78% or above after five months. The preparation process disclosed by the invention is low in raw material cost and good in process controllability.

The application provides a preparation method of a photo-acid generator sulfonate for ARF photoresist, and belongs to the technical field of organic synthesis. The application uses 2-bromo-2,2-difluoroacetate as a reaction raw material, and is low in cost. The application improves an existing sulfinylation process, specifically, the application uses triphenylmethyl mercaptan as a raw material to introduce a-S- group, and through subsequent hydrogen peroxide oxidation, a sulfonate with high stability is obtained, and the reaction is easy to monitor. Moreover, the application introduces the-S- group first and then introduces an ester group, and in the subsequent deprotection and acylation reaction, heating in an alkaline environment is not needed, and the hydrolysis reaction of the ester group can be avoided.

The present invention relates to a low-warpage low-dielectric PBT composite material and a preparation method thereof, product: by weight, including 20-62 parts of thermoplastic polyester resin composition, 1-10 parts of olefin copolymer, 1-10 parts of toughening agent, 15-35 parts of glass fiber and 10-30 parts of silicon powder; the thermoplastic polyester resin composition includes PBT and PET, the weight portion of PBT in the thermoplastic polyester resin composition is greater than 70%, and the weight portion of PET in the thermoplastic polyester resin composition is not less than 9.5%; method: the raw materials other than glass fiber are mixed to obtain a mixture, the mixture is fed into a twin-screw extruder from the main feed port, and the glass fiber is fed into the twin-screw extruder from the side feed port at the same time, the processing temperature of the twin-screw extruder is controlled to be 220-260°C, and extrusion granulation is performed to obtain the product. The method of the present invention is simple, and the product of the present invention has both excellent low warpage and low dielectric properties.