126 results about "N-methylimidazole" patented technology

The invention discloses an ionic liquid polymer electrolyte and a preparation method thereof. An ionic liquid polymer is synthesized through using a polymer chemical functionalization process, and the structure of the ionic liquid polymer is represented by formula (1) shown in the specification. The ionic liquid polymer is formed through connecting N-methylimidazole with a polymer by chemical bonds, wherein the polymer can be a linear polymer and a hyperbranched polymer, the linear polymer is polyethylene oxide and polyepoxy chloropropane preferably, and the hyperbranched polymer is hyperbranched polyether preferably; and anion a can be halogen, tetrafluoroborate, hexafluorophosphate and ditrifluoromethyl sulfimide, and N-methylimidazole in the formula (1) can be substituted by a pyridine ring, tributyl amine and a pyrrole ring. The ionic liquid polymer electrolyte is composed of the ionic liquid polymer and a lithium salt, and contains no volatile solvents, and the conductivity at room temperature of the ionic liquid polymer electrolyte can reach 3.5*10<-4>Scm<-1>. The polymer electrolyte can be used in lithium ion secondary batteries, electrochromic devices, supercapacitors and other electrochemical devices.

The invention relates to a synthetic oilfield flooding compounded corrosion inhibitor which takes imidazole type ionic liquid synthesized by a two-step method as a controlled-release host and the other added compounds as auxiliary controlled-release agents. A preparation method of the corrosion inhibitor for the novel ionic liquid oil field water comprises the following steps: (1) at a certain temperature, mixing N-methylimidazole with n-butyl bromide or benzyl chloride, reacting while stirring, washing and removing unreacted substances after reaction is carried out for hours, thus obtaining halide of N-methylimidazole; (2) mixing the product obtained in the step (1) with a selected compound, adding a solvent, stirring for reacting for a period of time at a certain temperature, extracting a reaction solution, washing, and removing the solvent, thus obtaining the target products; and (3) compounding the products obtained in the step (2) with urotropine, OP-10, potassium iodide and thiourea in a certain proportion, thus obtaining the corrosion inhibitor with extremely high corrosion inhibition efficiency. The preparation method of the corrosion inhibitor for the novel ionic liquid oil field water has the advantages that raw materials are simple and available, the operational process is easy and safe, the reaction time is short, the cost is low, the yield is high, the corrosion inhibition performance is strong, the corrosion inhibitor for the novel ionic liquid oil field water is applicable to industrial large-scale production, and the practicability is strong.

The invention relates to a preparation method and application of an ionic liquid functionalized Al-MCM-41 mesoporous material. The preparation method comprises the following steps of: preparing a solution by taking CTAB (Cetyltrimethyl Ammonium Bromide) as a template agent, TEOS (Tetraethyl Orthosilicate) as a silicone source and aluminum nitrate or sodium metaaluminate as a precursor according to a molar ratio, and crystallizing, filtering, washing, drying and roasting the solution to obtain Al-MCM-41; obtaining Al-MCM-41-Cl through coupling; reacting the Al-MCM-41-Cl with N-methylimidazole,and carrying out cooling, suction filtering, washing and drying to obtain the ionic liquid functionalized mesoporous material Al-MCM-41-Im. The invention has the advantages that the method has simpleprocess, and the ionic liquid functionalized Al-MCM-41 mesoporous material has ordered and uniformly distributed pore structure and acid-situ surface and can be used as a catalyst for a reaction between epoxypropane and carbon dioxide to produce propylene carbonate.

The invention discloses a method of preparing metal compositions, which comprises the following steps: in an electrochemical reaction system, a metal M is used as a sacrificial anode, platinum or graphite is used as an inert cathode, ionic liquid N is used as an electrolyte, and an organic ligand R is added to the electrolyte to electrochemically synthesize the metal compositions in an inert gas atmosphere. Because the invention adopts the ionic liquid as the electrolyte instead of nonaqueous solvent, and no additional support electrolyte is added so that organic solvent can not pollute the environment, and final products are convenient to separate and purify. In addition, the invention uses a direct electrochemical method to prepare compositions of N-methylimidazole and metal copper to widen the research field of the synthesis and the preparation of the metal compositions, and the generation of metal surface compositions provides potential application prospects for the inhibition of metals and catalytic reactions on electrode surfaces.

The invention discloses a method for synthesizing methyl oleate and epoxy methyl oleate in ionic liquid medium, which pertains to the technical field of fine chemical synthesis. The invention adopts N-methylimidazole positive ion or ionic liquid composed of N-methyl-2-ketopyrrolidine positive ion liquid and inorganic anions as the catalyst and the medium for reaction; under normal atmosphere, oleic acid and methanol are catalyzed to react for generating methyl oleate; and the invention also adopts 1-methyl-3-n-butylimidazolium chloride ionic liquid as the reaction medium and [Bmim]W10O23 as the catalyst, and under normal atmosphere, uses the synthesized methyl oleate to carry out epoxidation reaction by being dropped with oxyful of 30 percent, thus generating the epoxy methyl oleate. Compared with the traditional catalyzing method, the invention has the advantages that: 1. the reaction temperature is low, the reaction time is short and the energy consumption is low without pollution; 2. the separation process is easier; and 3. the ionic liquid medium used in the reaction can be reused after being simply processed.

The invention discloses a method for extracting cellulose from straw stalk by using imidazole ion liquid. Firstly, the straw stalk is crushed into 100-mesh powder, and then an ion liquid 1-allyl-3-methylimidazole chloride (AMIMCI) is used for extracting the cellulose in an ultrasonic environment, wherein the ion liquid 1-allyl-3-methylimidazole chloride (AMIMCI) is formed by synthesizing N-methylimidazole and allyl chloride. The method disclosed by the invention has the following advantages: by adopting ultrasonic oscillation to assist the ion liquid to dissolve the straw stalk powder, the method contributes to removal of lignin, can be used for effectively releasing connection of ester bonds between the lignin and a carbohydrate, effectively eliminating the coating effect of the lignin to the cellulose and hemicellulose, enhancing solution of the cellulose in the ion liquid, realizing efficient treatment of the straw stalk, improving the utilization efficiency of biomass resources and solving the problem that the straw stalk is hard to degrade and recycle, and has far-reaching social meaning and economical value.

The invention discloses a method for detecting avermectins pesticide multi-residues in cereal agricultural products, which comprises the following steps of: extracting the avermectins pesticide residues from the cereal agricultural products with acetonitrile, separating an organic phase containing avermectins pesticides from a water phase under the action of salting-out, performing fluorescence derivatization on the extracted avermectins pesticides by a trifluoro acetic anhydride (TFAA)-N-methylimidazole (NMIM)-acetonitrile (ACN) method in an anhydrous state, and realizing the trace residue analysis of the pesticides by adopting a high performance liquid chromatography-fluorescence detection method. The method of the invention has the advantages of performing trace analysis and detection on the residues of avermectin, emamectin benzoate and ivermectin in a plurality of cereal agricultural products, such as rice, wheat, corn and the like, along with simplicity, convenience, time saving, low cost and the like.

The invention discloses iron-based imidazole ion liquid for removing SO2 from smoke and a preparation method of the iron-based imidazole ion liquid. Anions of the ion liquid are combined with hydrogen on imidazole rings in the form of FeCl4-. The method includes the steps of putting 40 ml or 41.44 g of N-methylimidazole and 63 ml or 56.07 g of n-chlorobutane in a 250-ml pear-shaped bottle to be mixed according to the molar ratio of 1 to 1.2, conducting water bath ultrasonic auxiliary backflow heating at the temperature of 70 DEG C for 6 h, conducting liquid separation through a liquid separation hopper to obtain lower layer liquid, conducting washing three times through ethyl acetate of equal volumes to remove unreacted raw materials, conducting drying for 7 h to remove residual ethyl acetate and obtain a product [Bmim]Cl, adding ferric chloride to be stirred for 20 h under the magnetic force, conducting centrifuging to obtain upper layer liquid, conducting washing three times through distilled water to remove unreacted reactant, and conducting drying for 10 h to obtain the iron-based imidazole ion liquid. The iron-based imidazole ion liquid is short in preparation cycle, high in yield and simple in reaction by-product removal.

The invention relates to an organo-metallic catalyst for preparing cyclohexane by hydrogenation of benzene and a preparation method and application thereof. The preparation method comprises the steps of: reacting RuCl3 with a ligand S1, wherein the mol ratio of the RuCl3 to the ligand S1 is 1:1.1-2.0; reacting Ru-S1 with a ligand S2 according to the mol ratio of 1:10-20, and then reacting with anhydrous sodium carbonate and 1,3-cyclohexadien according to the mol ratio of 1:2:2-1:3:3 to obtain Ru-S1-S2; reacting N-methylimidazole with 1-chlorobutan according to the mol ratio of 1:1-2 with ethylbenzene as a solvent under normal pressure at a temperature of 30-120 DEG C to obtain [BMIM]Cl; and placing the Ru-S1-S2 and the [BMIM]Cl in a fixed bed reactor for reacting to obtain an ionic liquid catalyst, wherein the mol content of the Ru-S1-S2 is 2-5 percent. The invention is used for preparing the cyclohexane by the hydrogenation of the benzene, wherein the conversion rate of the benzene reaches 20-35 percent and the selectivity of the cyclohexane reaches above 65-87 percent.

The invention discloses two selective ionic liquids and a synthesis method thereof, and belongs to the technical field of ionic liquids. The ionic liquids are a 1-methyl acetate-3-methylimidazole bistrifluoromethanesulfonimide salt and a 1-methyl p-toluate-3-methylimidazole bistrifluoromethanesulfonimide salt. The synthesis method comprises the preparation process: under the protection of N2, adding N-methylimidazole and halogenated hydrocarbon into a reaction vessel according to the molar ratio of 1:1-1.5, adding acetonitrile, stirring uniformly at the room temperature, heating to 55 DEG C, refluxing for 12 h, allowing the system to be divided into an upper phase and a lower phase, after cooling, separating to obtain a lower-layer halogen ionic liquid crude product, washing with ethyl acetate, and drying to obtain a purified ionic liquid intermediate; and adding an anionic salt aqueous solution into the ionic liquid intermediate, stirring for 12 h at the room temperature, after finishing a reaction, allowing the solution to be divided into two layers, discarding the upper-layer aqueous phase, washing with distilled water for a plurality of times until the water layer is neutral, and drying to obtain the product. The preparation process is simple and can be manipulated, the whole reaction process is stable, and thus the preparation method can be considered to be applied in industrialized production.

The invention relates to a method for preparing aldehyde or ketone by alcohol selective oxidation under catalysis of a copper complex. The preparation method comprises the following steps: adding ethanol, N-methylimidazole, copper acetate dihydrate, 2,2,6,6-tetramethyl-1-oxo piperidine and deionized water into a round-bottom flask, and reacting to obtain reaction products; extracting the reaction products with ethyl acetate to obtain a crude product; recrystallizing the crude product in ethanol to obtain a copper complex catalyst; and adding the copper catalyst, 2,2,6,6-tetramethyl-1-oxo piperidine primary alcohol or secondary alcohol and deionized water, reacting, and extracting reaction products with ethyl acetate, so that the aldehyde or ketone product is obtained. The method provided by the invention has the advantages that the metal complex is taken as the catalyst, water is taken as solvent, and alcohol is oxidized under catalysis to obtain aldehyde or ketone; and preparation is convenient, price is relatively low, yield is high, purity is higher than 98%, mass synthesis can be carried out, and the method provided by the invention is applicable to industrial production application.

The invention relates to a method for preparing metal titanium by electro-deoxidization and specifically relates to the method for preparing the metal titanium by taking ionic liquid as an electrolyte and performing the electro-deoxidization at room temperature. The method comprises the following steps: performing electrolysis at the room temperature by taking the ionic liquid as the electrolyte, taking graphite as an anode and taking a prepared cathode as a cathode, wherein the ionic liquid is prepared by firstly preparing an intermediate of the ionic liquid from N-methylimidazole and halogenated alkane by adopting a light wave-ultrasonic wave synthesis method and further reacting the intermediate of the ionic liquid with sodium tetrafluoroborate for preparation. The method disclosed by the invention has the advantages of convenience in operation, high reaction speed, high efficiency and high yield, as well as high product purity and capability of reducing production period, so that the method is an environment-friendly, green and low-energy-consumption new method for preparing metal titanium by electro-deoxidization.

The invention discloses a preparation method of a rare-earth composite oxide photocatalyst. The main preparation technology comprises the following steps: dissolving La(NO3)3.nH2O, Fe(NO3)3.9H2O and 50% Mn(NO3)2 in deionized water to prepare the mixed solution of metal nitrates; adding ammonia water in the mixed solution to adjust the pH value, stirring, performing ultrasonic dispersion, adding ionic liquid prepared from N-methylimidazole, toluene and diethyl sulfate, performing ultrasonic dispersion continuously; and performing centrifugal separation, washing the obtained precipitate, dryingthe precipitate in an oven, roasting in a muffle furnace to obtain oxide raw powder, and roasting in air atmosphere to finally prepare the new La-Fe-Mn catalyst. The preparation method has simple process and mild reaction conditions; and the prepared catalyst has better catalytic activity in the reaction that the catalytic degradation of phenol is performed under visible light.

The invention discloses a double-ligand zinc complex catalyst which is prepared from an active main body zinc halide salt, an active functional ligand L1 and a corrosion-inhibition functional ligand L2, wherein the active functional ligand L1 is tetramethyl ammonium halide, tetraethyl ammonium halide, tetrapropyl ammonium halide, tetraethyl phosphonium halide, tetraphenyl phosphonium halide, methyl tri-tert-butyl phosphonium halide or methyl triphenyl phosphonium halide; and the corrosion-inhibition functional ligand L2 is N-methylimidazole, iminazole, isoquinoline, quinoline, 2-toluquinoline, 4-toluquinoline, biquinoline, pyridine, 3-methylpyridine or 1,10-o-phenanthroline. The invention also discloses application of the catalyst in preparing corresponding cyclic carbonate by CO2-epoxy compound cycloaddition. The catalyst has the advantages of low temperature, high catalytic activity, low corrosivity, easy separation, high stability, favorable recovery performance and the like, can form a homogeneous catalytic system, and has favorable industrial application prospects.

The invention relates to the preparation of a Ti-MCM-41 mesoporous material with functionalized ionic liquid and an application thereof. The preparation method comprises the following steps of: adopting CTAB (Cetyltrimethyl Ammonium Bromide) as a template agent, adopting TEOS (tetraethyl orthosilicate) as silicon source, and adopting tetrabutyl titanate as a precursor; preparing solution according to mol ratio; crystallizing, filtering, washing, drying and roasting to obtain Ti-MCM-41; then coupling to obtain Ti-MCM-41-Cl; and adopting the Ti-MCM-41-Cl to react with N-methylimidazole; cooling, extracting, washing and drying to obtain the mesoporous material Ti-MCM-41-lm with functionalized ionic liquid. The preparation and the application have the following advantages: the method is simple in process; the mesoporous material Ti-MCM-41-lm with functionalized ionic liquid has orderly and uniformly distributed hole-channel structures; the surface of the mesoporous material has acid sites; and the mesoporous material is adopted as a catalyst for the reaction of epoxypropane with carbon dioxide to produce propylene carbonate.

The invention discloses a microextraction method for detecting triclosan and methyl triclosan. An ionic liquid is imidazole naphthoates, has the characteristics of strong acidity, slight water solubility, fluorescence sensitizing effect on weak fluorescence compound and the like, and can be mixed with the traditional ionic liquid [C4MIM]BF4 to serve as a dispersing agent in the microextraction process. The ionic liquid is synthesized by the steps of enabling 1-chloromethane and N-methylimidazole to react, wherein the mole ratio of 1-chloromethane to N-methylimidazole is 1.1-1.5; enabling a reaction product to react with 1-naphthoic acid. The microextraction method disclosed by the invention has the advantages that the nonpolar environment of an extraction agent is promoted; the volume of a precipitated phase is increased; the recovery rates of TCS and MTCS are increased by 10-20%; the pH adjusting step in the microextraction process is avoided; the recovery rates in mediums such as blood plasma, urine samples, eggs, milks and the like can reach 98.6-106.1%; the minimum detection limit is as low as 0.12-0.66 [mu]g / L.

The invention relates to a preparation method of an ionic liquid for efficiently extracting cellulose, which comprises the following steps: reacting raw materials N-methylimidazole and 3-bromopropylene in a nitrogen protective atmosphere to synthesize 1-allyl-3-methylimidazolyl bromine salt; mixing the 1-allyl-3-methylimidazolyl bromine salt and a lead acetate water solution to react, thereby obtaining a 1-allyl-3-methylimidazolyl acetate water solution and a lead bromide precipitate; and after freeze-drying to remove the lead bromide, extracting the 1-allyl-3-methylimidazolyl acetate water solution with ethyl acetate, and carrying out vacuum distillation and acetone extraction to obtain the ionic liquid which can be used for extracting cellulose and can be recycled for repeated use. The preparation method is simple, does not use any organic solvent, and has the advantages of high conversion rate, no toxicity and no pollution; and the ionic liquid has the advantages of high solubility, high solution rate, low temperature requirement and lower viscosity under the condition of dissolving the same mass of cellulose, and is beneficial to cellulose regeneration and after treatment.

Disclosed are: an inhibitor of the expression of matrix metalloproteinase-9 gene; a therapeutic agent for a disease associated with matrix metalloproteinase-9; and a carcinostatic agent. Each of the agents comprises a pyrrole-imidazole polyamide having an N-methylpyrrole unit, an N-methylimidazole unit and a γ-aminobutyric acid unit. The pyrrole-imidazole polyamide can be folded at the site of the γ-aminobutyric acid unit to form a U-shaped conformation in a minor groove of a double-stranded domain comprising a part or the whole of a specific nucleotide sequence (SEQ ID NO:2, SEQ ID NO:4) included in a human matrix metalloproteinase-9 gene promoter and a strand complementary to the part or the whole of the specific nucleotide sequence. In the U-shaped conformation, a Py-Im pair, an Im / Py pair and a Py / Py pair in the pyrrole-imidazole polyamide target a C-G base pair, a G-C base pair, and both of an A-T base pair and a T-A base pair in the minor groove, respectively.

The invention relates to a preparation method for a dendritic organic / inorganic hybrid fire retardant. The preparation method comprises the following steps: preparation of an N-methylimidazole quaternary ammonium salt; preparation of N-methylimidazole quaternary ammonium salt modified organic montmorillonite; preparation of p-azophenol organic montmorillonite; preparation of dendritic p-azophenol organic montmorillonite; and preparation of the flame retardant. Compared with the prior art, the invention has the following advantages: since a dendritic liquid crystal polymer containing phosphorus and nitrogen is used for modification, the fire retardant has high thermal stability; when applied to the rubber industry and the cable industry, the fire retardant can replace or partially replace traditional flame-retardant and reinforcing materials which have higher prices, are environmentally unfriendly and damage other properties of the polymer and can improve flame retardation and mechanical performance of rubber materials.

A process for the sysnthesis of oligonucleotides using phosphoramidite chemistry is provided. The process employs as activator a 1,1-dioxo-1,2-dihydro-1λ6-benzo[d]isothiazol-3-one, preferably in the presence of an organic base. The 1,1-dioxo-1,2-dihydro-1λ6-benzo[d]isothiazol-3-one is represented by the following structural formula: wherein p is 0 or an integer from 1 to 4; X7 is O or S; R for each occurrence is a substituent, preferably each independently, a halo, a substituted or unsubstituted aliphatic group, —NR11R12, —OR13, —OC(O)R13, —C(O)OR13, or cyano; or two adjacent R groups taken together with the carbon atoms to which they are attached form a six membered saturated or unsaturated ring; R11 and R12 are each, independently, —H, a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group; and R13 is a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group. Preferred organic bases are pyridine, 3-methylpyridine, or N-methylimidazole.

The invention discloses a catalyst system for preparing a block polymer and a method for catalytic synthesis of the block polymer. Under the N2 protection and the certain temperature, N-methylimidazole reacts with haloalkylation alcohol, acetonitrile and diethyl ether are purified, vacuum drying is performed, and the catalyst system for preparing the block polymer is prepared; the catalyst systemcatalyzes cyclo-anhydride, epoxide and lactide to react in an organic solvent under the certain temperature, chloroform is used for dissolving a reaction system, methyl alcohol acidified by hydrochloric acid is purified, and the block polymer is obtained. No any metal ion is introduced to the catalyst system, the problem that metal residues are caused in a traditional metal catalyst system is avoided, the system is environmentally friendly, meanwhile no extra auxiliary catalyst or initiator needs to be added in the preparation process, and the system is simple and convenient to use.

The invention discloses a high performance liquid chromatography detection method for the abamectin content in edible vegetable oil. The method comprises the steps that a sample is subjected to vortex oscillation extraction through methanol, purified with an ODS C18 solid-phase extraction column, subjected to derivatization through N-methylimidazole and trifluoroacetic anhydride and lastly determined through a liquid chromatography-fluorescence method. According to the method, few reagents are adopted, and the cost is reduced; a sample pretreatment method is simple, the purification effect is good, maintenance of instruments in the using process is reduced, and the technical problems that when a liquid chromatography-ultraviolet detector is used, the sensitivity is too low, and matrix interference is serious are solved; a determined result is accurate and good in repeatability, the detection specificity and sensitivity are high, and a reference is provided for detection of the abamectin content in the edible vegetable oil.

The invention relates to a method for synthesis of a novel mesoporous molecular sieve with acidic functional ionic liquid as the template agent. The method is characterized by: taking self-made beta zeolite as the guiding agent, and respectively adopting synthesized N-methylimidazole ionic liquid [HSO3-(CH2)3-mim][HSO4], [HSO3-(CH2)3-min][H2PO4] and triethylamine ionic liquid [HSO3-(CH2)3-NEt3][HSO4], [HSO3-(CH2)3-NEt3][H2PO4], [HSO3-(CH2)3-NEt3][Cl] as the template agent to synthesize novel molecular sieves MMS-11, MMP-12, MNS-16, MNP-10, and MNC-13 under ion thermal conditions. And all the synthesized samples have a mesoporous structure.

The invention discloses a cationic fluorescent probe for dansyl biimidazole derivatives as well as a synthesis method and application of the cationic fluorescent probe. The cationic fluorescent probe has the structural formula as shown in the specification. The synthesis method comprises the steps of with dansyl which is high in fluorescence quantum yield and extremely sensitive to a microenviroment as a signal output group, protecting two ends of diethylenetriamine to introduce dansyl; then, deprotectnig two ends of diethylenetriamine, and reacting diethylenetriamine with bromoacetyl bromide; and finally, enabling the reaction product to be covalently bound with N-methylimidazole to synthesize the cationic fluorescent probe for the dansyl biimidazole derivatives. The cationic fluorescent probe is good in chemical stability, capable of realizing real-time and online measurement of amino acid, rapid in response to aspartic acid or glutamic acid, high in sensitivity, wide in response range and capable of detecting amino acid with high selectivity, high sensitivity and low detection limit, wherein the detection limits can respectively reach 1.6 micromoles / liter and 6.0 micromoles / liter.

The invention discloses preparation and application of a photocatalyst Ag / AgBr, and belongs to the technical field of nanocatalysts. According to the method, 1-butyl-3-methylimidazole bromine ([BMIM]Br) is prepared from N-methylimidazole and n-butyl bromide under certain conditions, wherein a preparation method comprises the steps that a certain amount of N-methylimidazole and a certain amount of n-butyl bromide are weighed and put into a round-bottom flask to be stirred and refluxed for a period of time in a high-temperature water bath to obtain faint yellow thick liquid, and 1-butyl-3-methylimidazole bromine ([BMIM]Br) which is collected after cooling has the very high catalytic activity in preparation of the photocatalyst Ag-AgBr by serving as a precursor.

The invention provides a novel high-efficient CO2 cycloaddion ionic liquid catalyst with high selectivity and high conversion rate. The catalyst is prepared by the following steps of: mixing N-methylimidazole and allyl chloride in a proper molar ratio; heating the mixture to between 55 and 70 DEG C, and reacting the mixture for 8 to 12 hours in the protection of nitrogen to prepare 1-allyl-3-methylimidazole chloride ionic liquid; and copolymerizing the 1-allyl-3-methylimidazole chloride ionic liquid with acrylic acid. The ionic liquid catalyst prepared by the method has higher thermal stability, higher selectivity and conversion rate for generating five-membered ring compounds by carbon dioxide and epoxy compounds, simple preparation method, low cost and reusability, is suitable for large-scale production, and has wide application prospect in the industrial catalytic field.

The invention discloses a solid and liquid phase conversion mixed electrolyte, a preparation method thereof and application thereof. The method comprises the following steps of: adding N-methylimidazole and methylbenzene, raising the temperature under the protection of N2, dropwise adding n-propyl bromide slowly, reacting the components continuously, standing the reaction product to be layered, discarding the methylbenzene solution on the upper layer, washing the yellow solution on the lower layer with methylbenzene, and drying the product in vacuum to obtain yellow thick liquid of 1-methyl-3-propylimidazolium; dropwise adding saturated aqueous solution of KPF6 into the yellow thick liquid slowly, stirring at the room temperature, standing the reaction product to be layered, repeatedly washing the crude product of oily liquid on the lower layer until no Br<1-> exists in the aqueous phase, and dehydrating the residual water to obtain pale-yellow 1-methyl-3-methylimidazolium hexafluorophosphate ionic liquid; and weighing LiPF6, and dissolving the LiPF6 in the liquid to prepare the mixed ionic liquid electrolyte. The electrolyte is in solid phase at low temperature and in liquid phase at high temperature, and can be converted between solid phase and liquid phase along with the change of temperature. The energy density of a lithium air battery prepared from the electrolyte can be improved, the corrosion speed of a lithium cathode can be slowed, and the cyclic times of the battery can be increased.

The invention discloses a water-based metal cleaning agent and a preparation method thereof. The preparation method of the water-based metal cleaning agent comprises the steps that thiourea, cetyl trimethyl ammonium bromide, diphenylguanidine, magnesium silicate, carbitol, murexide, sodium thiosulfate, isopropanol, di-1,2-ethylidene penteticacid, sodium tetraphosphate, isooctyl phosphate, sodium alkyl benzene sulfonate, sec-polyoxyethylene ether, n-b-hydroxy ethidene diamine nitrilotriacetic acid, N-methylimidazole and deionized water are used as raw materials, the raw materials are added stage by stage, and the temperatures of all the stages are controlled, so that the water-based metal cleaning agent is obtained. According to the preparation method, operation is easy. According to the water-based metal cleaning agent, the stability in hard water is good, the stability under high-temperature and low-temperature conditions is good, corrosion to metal is small or avoided, the deoiling capacity is high, the degreasing rate is high, rinsing is easy, and the cost is low.