89 results about "Hexafluorophosphoric acid" patented technology

The invention belongs to the technical field of electrolyte, and particularly relates to a method for preparing liquid lithium hexafluorophosphate from sodium hexafluorophosphate. The method comprises the following steps: adding a sodium source into a hexafluorophosphoric acid aqueous solution for neutralization reaction to obtain a sodium hexafluorophosphate aqueous solution, then extracting to remove water, drying to obtain a sodium hexafluorophosphate solid, and heating and decomposing the sodium hexafluorophosphate solid to obtain phosphorus pentafluoride gas; the phosphorus pentafluoride gas is not mixed with SO3, POF3, HF and other impurity gases, a complex refining and purifying process is not needed, and the phosphorus pentafluoride gas with the purity exceeding 99.9% can be obtained after simple purification and can be directly used for synthesizing liquid lithium hexafluorophosphate. The method does not generate waste acid, does not need a complicated phosphorus pentafluoride gas purification process, is particularly suitable for the requirements of the lithium battery industry on high-purity electrolyte, and has the remarkable advantages of high product purity, small environmental pollution, low production cost and the like.

The invention discloses an efficient nano silicon dioxide tackifier and a preparation method and application thereof, and relates to the field of oilfield chemistry, the preparation method comprises the following steps: taking nano silicon dioxide, ultrasonically dispersing in a first solvent, and then adding a small amount of a second solvent and a certain amount of a silane coupling agent to obtain preliminarily modified nano silicon dioxide; thirdly, stirring and dispersing acrylic acid and ammonium persulfate in a second solvent to obtain polymer modified silicon dioxide; and finally, dispersing the product, glucosamine sulfate, NMI (N-methylimidazole) and TCFH (N, N, N, N-tetramethyl chlorourea hexafluorophosphate) into a third solvent to react, thereby obtaining the product. The viscosity of crude oil and the oil displacement efficiency can be effectively improved under the conditions of high-salt and high-water-content oil reservoirs, the viscosity of the formed emulsion is increased along with the rise of the water content, and the flow resistance can adapt to the change of the water content, so that the swept volume is increased, and the requirement of the high-salt and high-water-content oil reservoirs for improving the recovery efficiency is met.

The invention discloses a method for catalyzing hydrolysis of hexafluorophosphate radicals by using a bifunctional solid acid material, the main active sites of the bifunctional solid acid material in the method are a Brnsted acid site formed by combining protonated sulfate radicals (HSO4 <->) with hydroxyl groups on the surface of TiO2 and a Ti < 4 + > (Lewis acid) site enhanced by induction of the Brnsted acid site, and in the catalytic hydrolysis process, the Brnsted acid site and the Ti4 < + > (Lewis acid) site can be used for catalyzing hydrolysis of the hexafluorophosphate radicals by using the bifunctional solid acid material. Ti4 < + > (Lewis acid site) generates strong adsorption and activation effects on PF6 <->, adjacent HSO4 <-> (Brnsted acid site) and PF6 <-> generate H.. F-P interaction, and the two sites apply a synergistic stretching effect on a P-F bond from different directions, so that a stable regular octahedron structure of PF6 <-> is greatly damaged, a reaction energy barrier of P-F bond breakage is remarkably reduced, efficient hydrolysis of PF6 <-> is realized, and the reaction time is shortened. The method has the advantages that the hydrolysis efficiency is high, the hydrothermal stability is good, extreme acid and alkali environments are not needed, the bifunctional catalyst is easy to regenerate and the like, and a brand new technical path and a solution are provided for harmless treatment of the hexafluorophosphoric acid-containing wastewater.

The invention provides a battery, a preparation method thereof and an electric device comprising the battery, the battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive current collector, the positive current collector comprises a conductive layer, the electrolyte comprises first anions and second anions, the first anions comprise hexafluorophosphate anions, the second anions comprise hexafluorophosphate anions, and the third anions comprise hexafluorophosphate anions. The first anions comprise one or more anions selected from anions shown in the formula 1 and anions shown in the formula 2, the second anions comprise one or more anions selected from anions shown in the formula 1 and anions shown in the formula 2, the thickness of the conductive layer is H1 [mu] m, the concentration of the first anions in the electrolyte is C1 mol / L, the concentration of the second anions in the electrolyte is C2 mol / L, and the battery meets the condition that H1 is larger than or equal to 0.2 * (C2 / C1) and smaller than or equal to (C2 / C1) + 3. According to the invention, the safety performance of the battery can be improved, and meanwhile, the battery has good electrochemical performance. Formula 1 and Formula 2

The invention discloses a method for synthesizing dipeptide Fmoc-Leu-Aib-OH, and belongs to the field of polypeptide synthesis, the specific preparation method comprises the following steps: under the action of organic alkali and an activating reagent, Fmoc-Leu-OH and H-Aib-OH react to obtain the dipeptide Fmoc-Leu-Aib-OH; the activating reagent comprises at least one of N, N, N ', N'-tetramethyl chloroformamidine hexafluorophosphate, 2-(7-azabenzotriazole)-N, N, N ', N'-tetramethyl urea hexafluorophosphate and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and the organic base comprises at least one of N-methylimidazole, N, N-diisopropylethylamine and pyridine. The dipeptide Fmoc-Leu-Aib-OH prepared by the preparation method disclosed by the invention is high in yield, high in purity and high in raw material conversion rate.

The invention discloses a battery monomer, an isolating membrane, a preparation method of the isolating membrane, a battery device and a power utilization device, the battery monomer comprises the isolating membrane and electrolyte, and the isolating membrane comprises a porous base membrane; the coating is arranged on at least one side of the porous base membrane and comprises a polymer additive, and the polymer additive comprises a first functional group and a second functional group; the first functional group comprises one or more of bis (fluorosulfonyl) imino group, bis (trifluoromethyl) sulfonyl imino group, trifluoroboric acid group, hexafluorophosphoric acid group, sulfonic acid group, hexafluoroarsenate group, trifluoromethanesulfonic acid group, difluorophosphoric acid group, bis (oxalato) boric acid group, difluoro (oxalato) boric acid group, difluoro (oxalato) phosphoric acid group, tetrafluoro (oxalato) phosphoric acid group and imidazolyl; the second functional group comprises one or more of quaternary ammonium ions, pyrrolidinyl, pyrrolyl, piperidinyl, pyridyl and imidazolyl. The battery monomer has good dynamic performance; the invention provides the isolating membrane for realizing the beneficial effects of the battery monomer, the preparation method of the isolating membrane, the battery device and the power utilization device.

An integrated process for co-production of phosphorus pentafluoride (PF5) and fluorosulfonic acid (HSO3F) in high yield and purity through a single reaction step is provided. The method comprises reacting a first reagent comprising an aqueous solution of hexafluorophosphoric acid (HPF6) and hydrofluoric acid (HF) with a second reagent comprising fuming sulfuric acid (H2SO4SO3), and recovering a product mixture comprising phosphorus pentafluoride (PF5) and fluorosulfonic acid (HSO3F).

The invention discloses a preparation method of dipeptide Fmoc-Leu-Aib-OH, and belongs to the field of polypeptide synthesis, the specific preparation method comprises the following steps: under the action of organic alkali and an activating reagent, Fmoc-Leu-OH and H-Aib-OH react to obtain the dipeptide Fmoc-Leu-Aib-OH; the activating reagent comprises at least one of N, N, N ', N'-tetramethyl chloroformamidine hexafluorophosphate, 2-(7-azabenzotriazole)-N, N, N ', N'-tetramethyl urea hexafluorophosphate and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and the organic base comprises at least one of N-methylimidazole, N, N-diisopropylethylamine and pyridine. The dipeptide Fmoc-Leu-Aib-OH prepared by the preparation method disclosed by the invention is high in yield, high in purity and high in raw material conversion rate.

This application relates to the field of molybdenum disulfide preparation technology, specifically disclosing a high-purity molybdenum disulfide and its preparation method. The preparation method includes the following steps: (1) plasma treatment of molybdenum concentrate followed by ultrasonic dispersion to obtain pretreated molybdenum concentrate; (2) adding the pretreated molybdenum concentrate to an acidic solution for oxidation reaction, followed by the sequential addition of hydroxyethylidene diphosphate and hexafluorophosphate for reaction, vacuum filtration, washing, and drying to obtain high-purity molybdenum disulfide. This application combines plasma and ultrasonic pretreatment of molybdenum concentrate. The combined effect of these two methods, utilizing the physical field enhancement effect, significantly improves the removal rate of iron and silicon dioxide, thereby increasing the purity of the obtained molybdenum disulfide.

The invention discloses a preparation method and application of an IL-MOF modified OPBI type high-temperature proton exchange membrane, and belongs to the field of proton exchange membranes. The proton exchange membrane comprises an ionic liquid containing hexafluorophosphoric acid anions which are easy to form hydrogen bonds and an MOF (Metal Organic Framework) nanostructure which is used as a skeleton support. The IL is selected from 1-ethyl 3-methylimidazolium hexafluorophosphate and 1-aminoethyl-3-methylimidazolium hexafluorophosphate, and the IL is selected from 1-ethyl 3-methylimidazolium hexafluorophosphate; and the MOF is selected from a group consisting of ZIF-8 and ZIF-90. The specific preparation method mainly comprises the following steps: adding MOF powder and an ionic liquid into an OPBI polymer solution, uniformly stirring and mixing the MOF powder and the ionic liquid, casting the MOF powder and the ionic liquid onto a glass plate, and volatilizing a solvent at a certain temperature to obtain the IL-MOF modified polybenzimidazole high-temperature proton exchange membrane. The preparation method disclosed by the invention is simple and efficient, and the prepared proton exchange membrane has excellent proton conduction capability and also has good dimensional stability and mechanical strength.

The invention discloses a copper ion intercalation two-dimensional beta-phase indium selenide material as well as a preparation method and application thereof. The method comprises the following steps: soaking a substrate loaded with a beta-InSe nanosheet in an organic solution of copper hexafluorophosphate tetraacetonitrile with the pH value of 4.0-6.5, and preparing the copper ion intercalation two-dimensional beta-InSe material through a solution heating and soaking method. According to the copper ion intercalation two-dimensional beta-phase indium selenide material and the preparation method thereof, a mild and efficient copper ion solution intercalation process is adopted, highly uniform and ordered distribution of copper between two-dimensional beta-InSe layers is achieved, the ferroelectric property and the electrical transport property of the copper ion intercalation two-dimensional beta-phase indium selenide material are regulated and controlled at the same time, and the prepared copper ion intercalation two-dimensional beta-phase indium selenide material is suitable for constructing a high-performance ferroelectric device.

This invention belongs to the field of polyolefins, and particularly relates to a method for reducing the ash content of polypropylene and the application of imidazolium ionic liquids. The method provided by this invention includes the following steps: mixing imidazolium ionic liquid with crude polypropylene, filtering, and washing to obtain low-ash polypropylene; the imidazolium ionic liquid has the structure of formula (I); in formula (I), R... ‑ The ash is derived from one or more of chloride, bromide, iodide, hydroxide, acetate, thiocyanate, nitrate, methanesulfonate, tetrafluoroborate, and hexafluorophosphate ions. This invention uses an imidazolium ionic liquid with a specific chemical structure as an ash removal agent for polypropylene. This imidazolium ionic liquid can interact with the metallic ash in polypropylene, thereby significantly reducing the ash content in the washed polypropylene product.

This invention discloses an anhydrous phase change system for carbon dioxide capture and its application, enabling high-purity recovery of ionic liquids. The anhydrous phase change system comprises a primary amine, an organic solvent, and an ionic liquid. The primary amine is monoethanolamine with a concentration controlled at 30 wt%, the organic solvent is n-butanol, and the ionic liquid is 1-butyl-3-methylimidazolium tetrafluoroborate or 1-butyl-3-methylimidazolium hexafluorophosphate. The anhydrous phase change system remains homogeneous before absorbing carbon dioxide and separates into a CO2-rich phase, an organic-poor phase, and an ionic liquid phase after absorption. The CO2-rich phase is regenerated by high-temperature heating. The organic-poor phase and the ionic liquid phase, along with the regenerated rich phase, participate in the next absorption or are directly recovered. This anhydrous phase change system for carbon dioxide capture overcomes the problem of low absorption load in traditional anhydrous phase change absorbents, achieves phase separation to reduce regeneration energy consumption, and effectively solves the problem of high-purity recovery of ionic liquids, demonstrating broad application prospects.

The present invention provides a phosphorus pentafluoride preparation method, which comprises: mixing a hexafluorophosphoric acid solution and a dehydrating agent, and carrying out a dehydration reaction at a temperature of 30-160 DEG C under a pressure of 0.1-3 MPa, wherein the hexafluorophosphoric acid solution contains water and hydrogen fluoride; after the dehydration reaction is finished, the reaction system is subjected to rapid pressure relief, and mixed gas containing phosphorus pentafluoride is obtained; wherein the pressure relief rate of the rapid pressure relief is greater than or equal to 0.1 MPa / min; and carrying out purification treatment on the mixed gas containing phosphorus pentafluoride to prepare the phosphorus pentafluoride gas.

The application discloses a coated modified lithium manganese iron phosphate lithium ion battery positive electrode material, and preparation steps thereof include the following steps: (1) preparing lithium manganese iron phosphate powder; (2) mixing pyridine and hexafluorophosphoric acid, adding lithium hydroxide and ethanol, and heating in a water bath to obtain a mixture; (3) adding an aqueous solution of indium trichloride, lithium manganese iron phosphate powder and L-malic acid into an ethanol solution of cerium nitrate and n-butyl titanate at the same time, ultrasonic dispersion is carried out, then the mixed solution is laid in a container, water and ethanol are removed by drying and evaporation, calcination is carried out at 120+5 DEG C, then the mixture and selenium acid powder are added and uniformly mixed, calcination is carried out again at 650+5 DEG C, after the completion of the calcination, air cooling is carried out to normal temperature, and the coated modified lithium manganese iron phosphate lithium ion battery positive electrode material is obtained. The positive electrode material prepared by coating and modifying lithium manganese iron phosphate according to the method can significantly improve the discharge specific capacity and capacity retention rate of the battery.

The present invention discloses a method for preparing phosphorus pentafluoride gas, comprising the following steps: (1) reacting a phosphorus-containing compound with hydrogen fluoride and an organic acid anhydride dehydrating agent to generate a hexafluorophosphoric acid solution; and (2) heating the hexafluorophosphoric acid solution to decompose it into gaseous hydrogen fluoride and phosphorus pentafluoride. The method has high water removal efficiency, simple process, and is easy to be continuously produced.

The invention provides an aggregation-induced emission (AIE) ionic probe (E)-4-(2-(5-(4-(diphenylamino) phenyl) thiophene-2-yl) vinyl)-1-(4-sulfanilamide acyl benzyl) quinoline-1-onium hexafluorophosphoric acid (V) salt of a targeted golf apparatus, namely a fluorescent probe TTQ-GA, a preparation method of the fluorescent probe TTQ-GA and application of the fluorescent probe TTQ-GA in the aspect of detection. The benzenesulfonamide group of the probe can be selectively combined with a Golgi apparatus protein cyclooxygenase 2 (COX-2) inhibitor SC-558 to realize Golgi apparatus targeting; due to the hydrophobic triphenylamine part and the hydrophilic quinoline cation part of the probe, the probe has amphipathy; the probe does not emit fluorescence in an aqueous solution, and can emit strong fluorescence when molecular movement is limited and excited, so that no-wash marking of the Golgi apparatus is realized; the probe generates a large amount of ROS under light excitation, promotes local lipid peroxidation increase of Golgi apparatus, and promotes cancer cell apoptosis.

The invention discloses a chiral gold-copper nanocluster oligomer as well as a preparation method and application thereof. The preparation method comprises the following steps: enabling chiral six-membered ring oxazinyl thione to react with triethylamine and chlorogold in methanol by virtue of a ligand-induced self-assembly strategy, synthesizing a gold-cluster-based supramolecular polymer in situ by virtue of a one-pot method, and then coordinating the gold-cluster-based supramolecular polymer with copper tetraacetonitrile hexafluorophosphate to construct a chiral Au-Cu alloy nanocluster oligomer. The oligomer can trigger the generation of reactive oxygen species (ROS) through a glutathione responsive ligand exchange mechanism, and significantly destroys the redox steady state in bacterial cells. The broad-spectrum antibacterial efficiency on gram-positive bacteria and gram-negative bacteria reaches 100%. The chiral metal oligomer provides a new strategy for developing an anti-infection-healing promoting integrated medical material, and has application potential in the fields of chronic wound dressings and anti-biofilm instruments.

The invention provides a preparation method and device of phosphorus pentafluoride, and the preparation method comprises the following steps: 1) carrying out atomization treatment on a mixed acid solution comprising a hexafluorophosphoric acid solution and a sulfuric acid solution to obtain atomized mixed acid; and 2) carrying out a thermal cracking reaction on the atomized mixed acid to obtain phosphorus pentafluoride. The preparation method of phosphorus pentafluoride provided by the invention can improve the purity of the prepared phosphorus pentafluoride, and has the advantages of high reaction efficiency, simple process and the like.

The invention discloses a double-bowl-shaped molecular container based on isoanion induction as well as a preparation method and application of the double-bowl-shaped molecular container, and relates to the technical field of supramolecular materials. The method comprises the following steps: dissolving 1, 2, 3, 4, 5, 6-hexabromomethyl benzene and 9-(2-(1H-imidazole-1-yl) ethyl)-9H-carbazole into acetonitrile, so as to obtain a first intermediate product; dissolving the first intermediate product in methanol, and dropwise adding a saturated ammonium hexafluorophosphate methanol solution while stirring to obtain a second intermediate product; and dissolving the second intermediate product and tetrabutylammonium bromide in acetonitrile, filtering, adding the filtrate into isopropyl ether, sealing, and standing at room temperature for 12-24 hours to obtain the double-bowl-shaped molecular container. Under the common induction of bromide ions and hexafluorophosphate ions, the six arms are alternately folded up and down three times to form the double-bowl-shaped molecular container.

A method for manufacturing phosphorus pentafluoride includes a dehydration step of dehydrating hexafluorophosphate hydrate using sulfuric acid containing less than 5% by mass of sulfur trioxide. Preferably, it also includes steps a) and b). a) a step of concentrating the sulfuric acid after the dehydration step. b) a step of reusing the sulfuric acid concentrated in step a) for the dehydration of hexafluorophosphate hydrate, and then using the sulfuric acid for the manufacture of phosphorus pentafluoride. Preferably, the dehydration step is carried out in the presence of hydrogen fluoride, and step c) is included before step a). c) a step of recovering the hydrogen fluoride after the dehydration step.

The application discloses a method for realizing high-efficiency electrocatalytic reduction of carbon dioxide into carbon monoxide by using an electrolyte. + The method comprises the following steps: taking a metal sheet as a working electrode, Ag / Ag + Taking an inert electrode as a counter electrode, taking an ionic liquid / acetonitrile solution as a cathode electrolyte, taking a proton acid solution as an anode electrolyte, taking carbon dioxide as a reactant, performing constant-potential electrolysis, and obtaining carbon monoxide; the metal sheet is a non-noble metal sheet, including copper, iron, nickel, cobalt, titanium and alloys thereof; the cation of the ionic liquid is imidazole, pyridine or quaternary ammonium salt, and the anion is tetrafluoroborate or hexafluorophosphate. The electrode material adopted by the application is a cheap and easily available commercial metal sheet, the reaction has high repeatability, the reaction current density is large, the carbon monoxide Faraday efficiency is high, the solvent is green, the reaction condition is mild, and the operation is simple.

The application provides a battery, a preparation method thereof, and a power utilization device comprising the same. The battery comprises a positive electrode sheet and an electrolyte. The positive electrode sheet comprises a positive electrode current collector, and the positive electrode current collector comprises a conductive layer. The electrolyte comprises a first anion and a second anion. The first anion comprises a hexafluorophosphate anion. The second anion comprises one or more selected from anions represented by formula 1 and anions represented by formula 2. The thickness of the conductive layer is H1 μm. The concentration of the first anion in the electrolyte is C1 mol / L, and the concentration of the second anion is C2 mol / L. The battery satisfies 0.2 x (C2 / C1) ≤ H1 ≤ (C2 / C1) + 3. The application can improve the safety performance of the battery while ensuring good electrochemical performance of the battery.

Provided are: a magnetorheological fluid which is capable of achieving both high reliability and high excitation stress even when used at low temperatures or high temperatures; and a brake device which is provided with the magnetorheological fluid. The magnetorheological fluid includes: metal magnetic particles, the surface of which is modified at an ionic liquid modification site including a first cation group and a first anion group; and an ionic liquid dispersion medium containing a second cation group and a second anion group, the first cation group and the second cation group being cations of the same kind and being selected from the group consisting of quaternary ammonium ions, imidazolium ions, pyridinium ions, and phosphonium ions, the first anion group and the second anion group are selected from the group consisting of tetrafluoroboric acid ions, hexafluorophosphoric acid ions, tris (pentafluoroethyl) trifluorophosphoric acid ions, bis (trifluoromethylsulfonyl) amide ions, hydrogen phthalate ions, and bis (fluorosulfonyl) imide ions.

This invention discloses a highly efficient hydrolysis method for hexafluorophosphate ions in wastewater catalyzed by high-valence metal cations. The hydrolysis method utilizes the strong Lewis acidity of high-valence metal cations in water, which can react with PF6. ‑ This characteristic of fluorine atoms bonding together makes PF6 ‑ The formation of Lewis acid-base pair intermediates that are susceptible to nucleophilic attack (water) significantly reduces PF6. ‑ High-temperature hydrolysis reaction energy barrier, and realization of PF6 ‑ Preliminary pyrolysis produces a large amount of H. + Subsequently, the H produced by hydrolysis + Due to its strong polarization effect, it interferes with PF6. ‑ The electronic structure can further reduce PF6 ‑ Thermal stability, high-valence metal cations and H + Synergistic catalysis enables highly efficient pyrolysis of hexafluorophosphate. This invention offers advantages such as high hydrolysis efficiency, low operating costs, no need for extreme acid or alkaline environments, low equipment corrosivity, and ease of engineering application.

The application discloses a preparation method of 2-fluoropyridine. 2-amino pyridine is used as raw material, and a diazotization and fluorination reaction is carried out in a fluorine-containing strong acid through a diazotization reagent to obtain 2-fluoropyridine. The fluorine-containing strong acid is tetrafluoroboric acid or hexafluorophosphoric acid, and the diazotization reagent is any one of sodium nitrite, calcium nitrite or tetrafluoroboric acid nitrite. In the application, polysorbate is additionally added in the fluorine-containing strong acid, so that the yield of the method is greatly improved, the stability of the fluoroboric acid diazonium salt in the reaction process is improved, the product is not easy to decompose, and the possibility of side reactions is reduced.

This invention discloses a method for synthesizing organophosphonic fluoride compounds. The method involves fluorinating organophosphonic oxides with fluorinating agents such as copper tetraacetonitrile hexafluorophosphate or copper tetraacetonitrile tetrafluoroborate to obtain organophosphonic fluoride compounds. The fluorinating agents used in this synthesis method are inexpensive, readily available, and stable, avoiding the use of expensive and unstable fluorinating agents. Furthermore, it enables efficient and selective conversion of organophosphonic oxides to organophosphonic fluoride compounds under mild conditions, and exhibits a wide range of functional group tolerances.

Provided in the present application is a method for preparing phosphorus pentafluoride, comprising: mixing a hexafluorophosphoric acid solution and a dehydrating agent, and then performing a dehydration reaction, the dehydration reaction being performed at 30-160°C under a pressure of 0.1-3 MPa, and the hexafluorophosphoric acid solution containing water and hydrogen fluoride; after the dehydration reaction is completed, performing quick pressure relief on the reaction system to obtain a mixed gas containing phosphorus pentafluoride, the pressure relief rate of the quick pressure relief being greater than or equal to 0.1 MPa / min; and purifying the mixed gas containing phosphorus pentafluoride to prepare phosphorus pentafluoride gas.

The invention discloses a liquid waterstop and a preparation method thereof, and belongs to the technical field of preparation of waterstop materials. The water-stop belt comprises a prepolymer end and a curing agent end in parts by weight, the material at the prepolymer end is prepared from 45 to 55 parts of polypropylene glutarate, 20 to 30 parts of hexamethylene diisocyanate, 6 to 10 parts of bis (2-hydroxyethyl) disulfide, 4 to 6 parts of nano zinc oxide, 1 to 2 parts of ultraviolet absorbent, 0.8 to 1.2 parts of hindered amine light stabilizer, 0.6 to 1 part of antioxidant, 8 to 12 parts of diisononyl phthalate and 55 to 65 parts of first ethyl acetate; the curing agent end is prepared from 10 to 15 parts of 2, 2 '-bipyridine-5, 5'-dimethyl alcohol, 0.3 to 0.7 part of dibutyltin dilaurate, 1 to 1.5 parts of ruthenium hexafluorophosphate, 2 to 4 parts of fumed silica and 8 to 12 parts of second ethyl acetate. The liquid waterstop provided by the invention has excellent mechanical properties, excellent weather resistance and efficient self-healing performance, and can be effectively applied to bridge engineering.

The invention discloses a SiGe / Si selective etching solution with low Ge content and a preparation method and application thereof, and the SiGe / Si selective etching solution comprises the following raw materials by volume percent: 50-98 vol% of hydrochloric acid, 1-50 vol% of nitric acid, 0.01-5 vol% of a fluorine source, and the balance of water; the fluorine source is one or more of hydrofluoric acid, ammonium fluoride, fluosilicic acid, fluoboric acid, ammonium bifluoride and hexafluorophosphoric acid. The preparation method comprises the following steps: mixing hydrochloric acid and nitric acid to react, standing to obtain an orange red solution, then adding a fluorine source and water to obtain the etching solution, and uniformly mixing the etching solution with water before etching for use. According to the method, the etching selection ratio and the etching rate are improved, the etching rate of the SiGe material is controlled, and the method is suitable for SiGe (lt; 20%), and has a wide application prospect.