885 results about "Ethyl Ethers" patented technology

Provided is a dispersant for hydraulic compositions that has high dispersibility and can reduce the viscosity of the hydraulic composition. [Solution] A dispersant for hydraulic compositions comprising: a polymer (P) having a structural unit (1) formed from a compound represented by general formula (1), and a structural unit (2) formed from a compound containing at least one selected from acrylic acid, methacrylic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, and salts thereof; and an ether compound (A) which is a compound in which 1 to 500 moles of an alkylene oxide having 2 to 4 carbon atoms are added to 1 mole of a mono- to tetrahydric aliphatic alcohol having 2 to 24 carbon atoms, wherein the mass average molecular weight of the polymer (P) is 5,000 to 5,000,000, and the mass ratio (A / P) of the ether compound (A) to the polymer (P) is greater than 0 and less than or equal to 0.25.

The invention discloses a lithium battery polymer solid electrolyte membrane capable of rapidly polymerizing at room temperature as well as a preparation method and application thereof, and belongs to the field of polymer electrolyte. The preparation method of the lithium battery polymer solid electrolyte membrane provided by the invention comprises the following steps: uniformly mixing polyethylene glycol methyl ether methacrylate and acrylonitrile according to a preset proportion to obtain a blended solution; sequentially adding lithium bis (trifluoromethanesulfonimide), divinylbenzene and benzoin diethyl ether into the blended solution, and uniformly mixing to obtain a precursor solution; and coating the precursor solution, and carrying out ultraviolet curing to obtain the lithium battery polymer solid electrolyte membrane. According to the lithium battery polymer solid electrolyte membrane provided by the invention, the voltage withstanding characteristic and the high ion conduction performance of the polymer electrolyte can be simultaneously improved, and the lithium battery polymer solid electrolyte membrane has a great gain on battery circulation and stability.

In one aspect, a demulsification additive includes a separation-promoting agent and a solvent. In another aspect, a demulsification additive includes a separation-promoting agent and a demulsifier or demulsifier intermediate. In another aspect, a method for separating crude oil from water includes introducing the water to the cmde oil, providing a demulsification additive that includes a separation-promoting agent, and contacting the water and the crude oil with the demulsification additive. In one embodiment, the separation-promoting agent is selected from the group consisting of dextran sulfate sodium salt, polyvinyl pyrrolidone functionalized with sodium salt of chloroacetic acid, poly(ethyleneglycol)-b(propyleneglycol)-b(ethyleneglycol) block copolymer, polyvinyl pyrrolidone functionalized with propyl sulfonate, sulfonated polyether ether ketone polymer, polyvinyl pyrrolidone functionalized with bromohexane, polyvinyl pyrrolidone functionalized with iodododecane, and combinations thereof.

The invention discloses application of small molecules containing diphosphonic acid groups in preparation of hydrophilic inorganic nanoparticles, and relates to the technical field of preparation of inorganic nanoparticles. The method comprises the following steps: dispersing inorganic nanoparticles coated with a hydrophobic organic compound on the surface into tetrahydrofuran, dropwise adding into a small molecule solution containing a diphosphonic acid group, uniformly mixing, and adding diethyl ether to prepare the hydrophilic inorganic nanoparticles. The method is simple and convenient to operate, mild in condition, rapid in conversion, high in conversion rate, energy-saving and efficient, and the converted nano-particle freeze-dried powder is stable in property and easy to store and transport and has certain popularization value. The problems that in the prior art, an inorganic nanoparticle hydrophilic modification method is complex, and conversion efficiency is low are solved.

The utility model discloses equipment for producing high-purity methyl ethyl ether, which relates to the field of synthesis of chemical compounds and comprises a reaction device, a heating component, a cold bath tank, a crude product receiving tank, a heavy component removal tower, a light component removal tower, a first reboiler, a second reboiler, a first condenser, a second condenser, a recovery tank, a product receiving tank and a controller, raw materials including sodium methoxide and halogenated ethane directly react under the anhydrous condition, a catalyst is not needed, crude methyl ethyl ether is produced, then the crude methyl ethyl ether enters a heavy component removal tower, crude methyl ethyl ether gas with heavy components removed enters a light component removal tower from the top of the light component removal tower after being detected to be qualified through a first online analysis and detection component, light component removal rectification is conducted, and methyl ethyl ether is obtained. Gas-phase impurities at the top of the light component removal tower are analyzed through the second online analysis and detection part, when the gas-phase impurities are detected to be qualified, the methyl ethyl ether product enters the product receiving tank, and then the high-purity methyl ethyl ether product is produced through continuous rectification, so that the product purity is high, the reaction temperature is low, the energy consumption is reduced, the reaction yield is high, and the production cost is low.

The invention discloses a wide-temperature-range ester-based electrolyte, and relates to the technical field of aqueous zinc ion battery electrolytes, and the electrolyte comprises the following components: a zinc salt, deionized water, an organic solvent and an organic salt additive; the organic solvent is diethylene glycol monoethyl ether acetate; the organic salt additive is o-sulfobenzoic acid ammonium. The invention also discloses an application of the wide-temperature-range ester-based electrolyte in an aqueous zinc ion battery and the aqueous zinc ion battery. The electrolyte can inhibit the growth of zinc dendrites, improve the corrosion phenomenon of a zinc negative electrode related to active water, realize effective protection of the zinc negative electrode, greatly improve the cycle performance stability and prolong the service life of the aqueous zinc ion battery.

The invention discloses a reaction buffer solution for improving endotoxin detection sensitivity of a recombinant tachypleus amebocyte lysate, a kit containing the reaction buffer solution and application of the reaction buffer solution. The reaction buffer solution comprises the following components: a Tris-HCl buffer solution, magnesium ions, sodium chloride, cane sugar, ethylene glycol diethyl ether diamine tetraacetic acid, a nonionic surfactant and cyclodextrin or a derivative thereof. The invention also discloses a preparation method of the reaction buffer solution and a kit containing the reaction buffer solution. When the reaction buffer solution or the kit is used for detecting the endotoxin of the recombinant tachypleus amebocyte lysate, the sensitivity of the recombinant tachypleus amebocyte lysate for detecting the endotoxin can be improved by one order of magnitude, the lowest detection limit can reach 0.0005 EU / ml, the reaction buffer solution or the kit has strong anti-interference capability and short reaction time, and the detection efficiency is greatly improved.

The invention discloses a recombinant C factor protein protective agent and application thereof. The recombinant factor C protein protective agent is prepared from the following components according to the final concentration of each component: 0.05 to 0.2 percent (w / v) of ProClin 300, 100 to 300 mM of sodium chloride, 1 to 10 mg / mL of bovine serum albumin, 5 to 20 percent (w / v) of trehalose, 10 to 50 percent (v / v) of glycerol, 0.1 to 0.5 percent (w / v) of tween-20 and 0.1 to 1 mM of ethylene glycol diethyl ether diamine tetraacetic acid with the pH value of 8.0. The invention also discloses an application of the recombinant factor C protein protective agent in refrigerated preservation of recombinant factor C protein. After the recombinant C-factor protein protective agent and the recombinant C-factor protein are mixed, the recombinant C-factor protein is prevented from being influenced by conditions such as aggregation, oxidation, freeze thawing and metal ion dependent inactivation, the stability of the recombinant C-factor protein in refrigeration storage is improved, and the activity retention rate of the recombinant C-factor protein after refrigeration storage for 12 months is greater than or equal to 90%; and the accuracy and sensitivity of endotoxin detection are maintained.

The invention relates to the technical field of repair materials, and particularly discloses an extracellular matrix fiber material as well as a preparation method and application thereof. The invention discloses a preparation method of an extracellular matrix fiber material. The preparation method comprises the following steps: taking animal tissues, and carrying out virus inactivation, decellularization and antigen removal, degreasing, drying, grinding and sterilization; the decellularization and antigen removal method comprises the following specific steps: sequentially soaking a sample with a surfactant solution for h; then, soaking treatment is carried out by adopting a salt-alkali solution which contains 0.05-3 mol / L of salt and has the pH value of 8-11; then carrying out soaking treatment by adopting a 0.1-1wt% enzyme solution; and in degreasing, one or more of normal hexane, trichloromethane, dichloromethane, methanol, ethanol, acetone, diethyl ether and ethyl acetate are used for soaking the sample. According to the technical scheme, the ECM powder particle material with high growth factor content is prepared.

A polyurethane composition with stable matt surface and good chalking resistance, which is suitable for use as a sealant and / or an adhesive for sealing and / or bonding, preferably for gap-filling, particularly in construction and manufacturing industries. The polyurethane composition includes:—a polyurethane prepolymer containing an isocyanate group, including a MDI-based prepolymer synthesized from a polyether diol and a polyether triol with MDI, and a TDI-based prepolymer synthesized from a polyether diol and a polyether triol with TDI; and —a phenyl alkyl sulfonate in an amount of 12-25 wt %, preferably 18-25 wt %, based on the total weight of the composition.

The invention relates to the technical field of wastewater treatment, and provides a treatment method of glycine production wastewater. The treatment method of glycine production wastewater comprises the following steps: (1) rectifying glycine wastewater to recover methanol, adding dilute sulphuric acid to adjust the pH value to 2.5-3.0, stirring, and standing; (2) transferring the supernate into another container, adding a ZIF-8 modified material, stirring, standing, filtering, collecting filter residues and filtrate, washing the filter residues with diethyl ether, and recovering urotropine; and (3) evaporating and concentrating the filtrate under the vacuum condition of-0.08 MPa and the temperature of 50-60 DEG C, and separating out high-purity ammonium chloride crystals. According to the treatment method for the glycine production wastewater, the problem that an existing treatment method is poor in removal effect on urotropin in the glycine production wastewater is solved; and the treated glycine production wastewater reaches the discharge standard.

The invention relates to a carboxylic ester-based wide-temperature-range electrolyte and application thereof, and belongs to the technical field of secondary batteries, and the specific scheme is as follows: the carboxylic ester-based wide-temperature-range electrolyte comprises a lithium salt and a solvent, and the solvent comprises cyclic carbonate and carboxylic ester; the carboxylic ester comprises an ester group and an alkoxy functional group, and the number of atoms on a main chain of the carboxylic ester is 5-9; the carboxylic ester comprises one or a combination of more of methyl methoxyacetate, ethyl methoxyacetate, methyl ethoxyacetate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate and ethylene glycol monomethyl ether propionate. The alkoxy group of the carboxylic ester and oxygen on the ester group have high electron cloud density, dissolution of lithium salt can be promoted, meanwhile, the chain length of the carboxylic ester is increased along with introduction of the alkoxy group, the stability of the carboxylic ester is greatly improved, and the carboxylic ester integrates the advantages of linear carbonic ester and short-chain carboxylic ester.

The invention discloses a preparation method of diiodosilane, and belongs to the technical field of material synthesis. The preparation method of diiodosilane comprises the following steps: adding a first iodine source and a second iodine source into a closed reactor in an inert gas atmosphere, and dissolving the first iodine source and the second iodine source in a solvent to form a uniform solution; and reducing the temperature, and adding liquid dichlorosilane. Raising the temperature to 30 to 80 DEG C and reacting; and after the reaction is finished, heating at reduced pressure, rectifying and purifying to obtain the high-purity electronic-grade diiodosilane. The first iodine source is lithium iodide, the second iodine source is at least one of sodium iodide or potassium iodide, and the solvent comprises at least one of acetonitrile, acetone, diethyl ether or ethanol. Lithium iodide and sodium iodide or potassium iodide are compounded, a specific solvent is matched, and a one-step method is used for testing, so that the input cost of raw materials is reduced, the experimental steps are simplified, the reaction rate of a reaction system can be improved, and the purity of a diiodosilane product is improved.

The invention relates to the technical field of water treatment, in particular to a nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: soaking a base membrane in a water phase solution, taking out the base membrane, performing surface drying, coating the base membrane with an oil phase solution, performing interfacial polymerization reaction, and curing to obtain the nanofiltration membrane, the water-phase solution comprises a polyamine monomer, a surfactant, an acid-binding agent and water; the acid binding agent is bicarbonate; the oil phase solution comprises an acyl chloride monomer, an organic solvent a and an organic solvent b; the organic solvent a is ethyl cyclohexane; the organic solvent b comprises at least one of methane chloride, monochloroethane, diethyl ether, methyl ethyl ether, dimethyl ether and methyl formate. The membrane flux is improved while the acid chemical cleaning resistance of the membrane is improved.

The invention discloses an anti-fingerprint scratch-resistant ink coating heat transfer printing process, which comprises the following steps of: heating and melting modified ink, coating the modified ink on transfer printing paper, drying, engraving a design pattern by using laser, adhering the transfer printing paper and a transfer printing base material, carrying out hot-pressing transfer printing, and irradiating by using ultraviolet light to finish ink heat transfer printing. The modified ink is prepared from the following raw materials in parts by weight: 20-30 parts of modified resin, 20-25 parts of flax wax, 15-20 parts of beewax, 15-20 parts of castor oil, 8-10 parts of a reinforcing additive, 3-5 parts of modified filler, 1-1.5 parts of KH570, 0.5-1 part of benzoin diethyl ether and 15-20 parts of pigment, and the raw materials are subjected to double-bond polymerization in the raw material mixing and illumination process, so that the cross-linking curing sites of the ink are increased; through cooperation with a layered structure of a modified filler base material graphene, the scratch resistance of the ink is improved, and meanwhile, the reinforcing additive contains flurane, long-chain alkyl and polysiloxane chain segments, so that residues of fingerprints on the surface of the ink can be reduced.

A concentrated laundry composition premix which is dilutable in water to form a laundry liquid composition, the viscosity which when formed from a dilution of five parts by volume water to one part premix and measured at 25° C. and at 106 s−1 is from 200 to 800 mPa·s., said premix comprising at least 10% wt. water, from 0.1 to 8% wt. ethoxylated polyol ester, and comprising from 5 to 70% wt. surfactant active excluding the ethoxylated polyol ester and where the ethoxylated polyol ester is not sorbeth stearate, wherein the surfactant comprises anionic surfactant and non-ionic surfactant in a weight ratio of from 50:50 to 1:99 and wherein the composition comprises from 0 to 5% wt. alkyl ether sulphate.

The invention relates to a method for extracting and separating corn straw lignin by using a deep eutectic solvent, which comprises the following steps: (1) carrying out Soxhlet extraction on air-dried corn straw fine powder by using absolute ethyl alcohol, and drying to obtain corn straw solid residues; (2) synthesizing a eutectic solvent by using cetyltrimethylammonium bromide and an ethylene glycol aqueous solution; and (3) carrying out reaction on the corn straw solid residues and the eutectic solvent under certain conditions, and then preparing the corn straw lignin extracted by the eutectic solvent by adopting the methods of reduced pressure filtration, rotary evaporation concentration, diethyl ether extraction, reduced pressure drying and the like. The extraction rate of the lignin is 50.73%-64.58%, and the purity of the lignin is 89.5%-99.4%. The method has the characteristics of high lignin extraction rate and high purity, and is of great significance to conversion and utilization of straw biomass lignin.

The present invention provides a high brain targeting, safe and noninvasive nasal-brain delivery preparation, which is characterized in that the nasal-brain delivery preparation comprises nimodipine, a good solvent, a diluent and an absorption enhancer, the good solvent is diethylene glycol monoethyl ether, and the absorption enhancer is phospholipid. The nasal-brain delivery preparation is prepared from a good solvent, a diluent, an absorption enhancer and the like according to a specific proportion. Nimodipine serving as an active ingredient is enriched in cerebrospinal fluid and brain tissues through a specific upper nasal meatus administration technology, so that the treatment effect of nimodipine is achieved; and meanwhile, the blood entering proportion is reduced, so that the cardiovascular toxicity and hepatotoxicity are reduced. In addition, the preparation formula has no irritation to local parts of the nasal cavity, and the compliance of a patient is improved.

The invention discloses a bismuth catalyst for electrocatalytic conversion of carbon dioxide and a preparation method of the bismuth catalyst. The preparation method comprises the following steps: preparing bismuth salt and an organic solvent into a saturated organic precursor solution containing Bi < 3 + >; wherein the bismuth salt is BiCl3, Bi (NO3) 3.5 H2O, Bi2 (SO4) 3, Bi (CH3COO) 3 or Bi (C6H5O7); the organic solvent is one or a combination of more of ethylene glycol, glycerol, acetone and diethyl ether; a saturated organic precursor solution containing Bi < 3 + > is used as an electrolyte to form an electrolysis system with two platinum sheet electrodes; carrying out constant-current electro-deposition on the electrolysis system under a stirring condition; wherein the cathode is used as a working electrode, the current density of the cathode is 10-500mA / cm < 2 >, and the deposition time is 30-200min; in the constant-current electro-deposition process, Bi < 3 + > in the saturated organic precursor solution is reduced to form metal Bi particles, and the particles are deposited to obtain the flocculent porous bismuth catalyst. The prepared bismuth catalyst has a loose and porous structure, can provide abundant active sites, can effectively promote electron transport and CO2 mass transport, and realizes efficient catalysis of reduction of carbon dioxide to prepare formic acid or formate.

The invention belongs to the technical field of medical machinery, and particularly relates to an inflammation response type controllable degradation antibacterial body stent and a preparation method thereof.The preparation method of the antibacterial body stent comprises the following steps that PEG is heated in an oil bath in a vacuum and sealed environment and stirred for 1-3 h, the mixture is cooled to the room temperature, protective gas is introduced, and the antibacterial body stent is obtained. Sequentially adding lactide, glycolide and stannous iso-octoate into PEG (Polyethylene Glycol), continuously heating in the oil bath and stirring for 6-8 hours to obtain PEG-PLGA sol; adding the PEG-PLGA sol into dichloromethane for dissolving to obtain a dichloromethane solution of the PEG-PLGA, and adding an ice diethyl ether solution into the dichloromethane solution of the PEG-PLGA, so that the PEG-PLGA is separated out from the mixed solution. L-lysine (Lys) is grafted to a PEG-PLGA molecular chain end, a topological structure of Ag nanocrystals is formed on the surface, Lys-PEG-PLGA / AgCl particles are prepared, the antibacterial body stent is prepared through a 3D printing technology, the matching degree of the antibacterial body stent and an appendix focus in a patient is improved, and meanwhile controllable degradation is achieved with pH adjustment as an anchor point.

The invention discloses a silicon wafer surface carbon dirt and EVA treatment method in waste solar photovoltaic silicon wafer recovery, which comprises the following steps: (1) placing a waste solar photovoltaic panel assembly subjected to high-temperature heat treatment in deionized water, and carrying out normal-temperature ultrasonic cleaning and drying; (2) then putting into an organic solvent, and carrying out ultrasonic treatment; (3) putting the silicon wafer obtained after ultrasonic treatment into deionized water, cleaning and recycling; the organic solvent in the step (2) is composed of polyether amine or dimethylformamide and butyl p-hydroxybenzoate or ethylene glycol monoethyl ether acetate. According to the method, the polar solvent and the permeable organic solvent are synergistically combined, EVA residues are efficiently dissolved under the action of ultrasonic waves, and stripping of carbon on the surface is promoted.

The invention belongs to the technical field of forest tree disease control, and particularly discloses an efficient pine nematode disease resistant inducer based on salicylic acid and dicyclohexylamine as well as a preparation method and application thereof, and the efficient pine nematode disease resistant inducer mainly comprises salicylic acid, cyclohexanediamine, a synergist (such as organic silicon) and an environment-friendly solvent (such as ethanol or diethyl ether). Wherein salicylic acid and dicyclohexylamine are used as core active ingredients, and the resistance of pine trees to pine wood nematode diseases is remarkably improved by stimulating the immune defense system of the pine trees. The inducer has the advantages of being environmentally friendly, moderate in cost, free of residues and pollution and the like, is suitable for multiple fields such as forest control and seedling treatment, can effectively reduce the occurrence rate and loss of the pine wood nematode disease, and promotes sustainable development of forestry. Through a specific preparation process, all the components are uniformly mixed to prepare a solution which is easy to apply, so that efficient protection on pine trees is realized.

The present invention relates to polyurethanes and polyurethane dispersions based on polyethers obtainable from renewable sources, particularly biomass.

A blade for electrophotography includes an elastic body including a contact portion contacting a surface of an image bearer. The contact portion is made of a polyurethane elastomer containing a reaction product of polytetramethylene ether glycol, aromatic isocyanate, and amine and has a Martens hardness of 5.0 N / mm2 or more and 30.0 N / mm2 or less.

The invention provides a continuous production method of chloromethyl ethyl ether, and relates to the field of chloromethyl ethyl ether. The continuous production method of the chloromethyl ethyl ether comprises the following steps: depolymerization, first-stage gas-liquid reaction, second-stage microchannel reaction and third-stage pipeline reaction. The continuous production method of chloromethyl ethyl ether effectively avoids the defects of low hydrogen chloride throughput, long reaction time and low production efficiency in the batch-type reaction process, and overcomes the problems of low mass transfer efficiency, low reaction speed and high production energy consumption of heterogeneous reaction of paraformaldehyde, ethanol and hydrogen chloride gas; and on the basis of realizing continuous production of the chloromethyl ethyl ether, the purity and the yield of the continuously prepared chloromethyl ethyl ether are further improved.

The invention discloses a series of azeotropic or azeotrope-like compositions for solvent and single-phase or two-phase cleaning applications, and the formula of the azeotropic or azeotrope-like compositions mainly comprises trans-1, 2-dichloroethylene and hexafluoropropylene dimer; the composition may include at most one of 1, 1, 2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether or 1, 1, 2, 3, 3, 3-hexafluoropropyl-2, 2, 2-trifluoroethyl ether, for example, 60 to 80% by mass of trans-1, 2-dichloroethylene, 20 to 40% by mass of hexafluoropropylene dimer or 60 to 65% by mass of trans-1, 2-dichloroethylene, or may also include any at most one of 1, 1, 2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether or 1, 1, 2, 3, 3, 3-hexafluoropropyl-2, 2, 2-trifluoroethyl ether, for example, 60 to 80% by mass of trans-1, 2-dichloroethylene, 20 to 40% by mass of hexafluoropropylene dimer or 60 to 65% by mass of 1, 1, 2, 2- 25 to 30% by mass of a hexafluoropropylene dimer; and 10 to 15% by mass of any one of HFE347 or HFE449. According to the present invention, the component capable of generating the azeotrope-like composition with the trans-1, 2-dichloroethylene component can inhibit the flash point of the trans-1, 2-dichloroethylene component so as to improve the safety performance of transportation, storage and use. The multi-component composition described by the formula can be used for high-efficiency degreasing of metal parts or high-efficiency cleaning of precise devices in the metal processing process, can also be used as a solvent, a degreasing agent, a desoldering agent or a drying agent and the like, and can meet multiple application requirements.

The invention belongs to the technical field of sodium pre-treatment of sodium-ion battery positive electrode materials, and discloses a sodium-ion battery positive electrode chemical sodium pre-treatment reagent and method and a sodium-ion battery. The method comprises the following steps: preparing a chemical pre-sodium-modified solution from ethylene glycol diethyl ether, 2, 2 '-dipyridyl and metal sodium, placing the pre-sodium-modified solution in a drying room environment, soaking a plurality of positive plates in the pre-sodium-modified solution, taking out the positive plates after a certain time, washing and drying the positive plates, and thus obtaining the pre-sodium-modified sodium ion battery positive electrode. The chemical pre-sodium modification reagent used in the invention has the characteristics of suitable oxidation-reduction potential, good chemical stability and the like, and can be applied to commercial sodium ion batteries.

The invention discloses a low-temperature sodium metal battery electrolyte and a preparation method and application thereof, and belongs to the technical field of energy storage batteries. The low-temperature sodium metal battery electrolyte provided by the invention is prepared by dissolving sodium salt in ethylene glycol diethyl ether (EGDEE) and cyclopentyl methyl ether (CPME). The ethyl chain at the tail end of EGDEE in the electrolyte prepared by the invention allows more anions to enter the first solvation sheath of the hybrid solvent, so that the ionic conductivity at the ultralow temperature of-40 DEG C is greatly improved. Meanwhile, a novel anion-rich solvation structure can be spontaneously formed at low temperature, and the kinematic mechanics rate of Na < + > is increased. Meanwhile, two organic solvents with non-cyclic ether structures are adopted, so that the problem of easy ring opening in the prior art is solved, ultralow sodium nucleation overpotential is shown, and uniform sodium deposition can be realized, so that the composite material has excellent reversibility and cycling stability at room temperature and low temperature, has excellent electrochemical performance, and is suitable for industrial production. And the prepared sodium metal battery has a wide application prospect.

The present invention belongs to the field of building materials, and specifically relates to an alkali-free, fluorine-free, and chlorine-free high-efficiency quick-setting agent and a preparation method thereof. The quick-setting agent of the present invention is mainly composed of polyaluminum sulfate, aluminum triformate, ethylene glycol ethyl ether, polymer thickener, modified nano silicon dioxide, hardening accelerator, calcium formate, and water, wherein the polymer thickener is better than the conventional thickener, can minimize the rebound of the shotcrete during the actual application process, the hardening accelerator can accelerate the hydration process, thereby shortening the setting time and improving the strength, etc., and the modified nano silicon dioxide can stabilize the various components of the quick-setting agent. The alkali-free, fluorine-free, and chlorine-free high-efficiency quick-setting agent prepared by the present invention has performance that meets the relevant standards after testing, the finished product is less harmful to the human body, the initial setting and final setting times are short, and the concrete has a higher compressive strength and retention rate after use, and has excellent performance, and can be efficiently applied to the construction industry.

Propylene glycol 1-monomethyl ether 2-acetate, Acetic acid, Propionic acid, Water, A propylene glycol monomethyl ether acetate composition comprising: The content of the propionic acid is 2 ppm or more and 30 ppm or less based on 100% by mass of the propylene glycol monomethyl ether acetate composition, the sum of the contents of the acetic acid and the propionic acid is 5 ppm or more and 80 ppm or less with respect to 100% by mass of the propylene glycol monomethyl ether acetate composition; A propylene glycol monomethyl ether acetate composition, wherein the water content is 17 ppm or more and 250 ppm or less, based on 100 mass % of the propylene glycol monomethyl ether acetate composition.