49 results about "1-butyl-3-methylimidazolium tetrafluoroborate" patented technology

An improved electrolyte for a cell having an anode comprising magnesium or magnesium alloy. The cell's cathode may desirably include iron disulfide (FeS2) as cathode active material. The improved electrolyte comprises a magnesium salt, preferably magnesium perchlorate dissolved in an organic solvent which preferably includes acetonitrile or mixture of tetrahydrofuran and propylene carbonate. The electrolyte includes an additive to retard the buildup of deleterious passivation coating on the magnesium anode surface, thereby enhancing cell performance. Such additive may preferably include 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), lithium hexafluorophosphate (LiPF6), or aluminum chloride (AlCl3)

The invention discloses a synthesizing method of polyimide. The method comprises the following step that: an aromatic diamine compound and an aromatic dianhydride compound are subject to a polymerization reaction in an ionic liquid, such that polyimide is obtained. The ionic liquid can be any one of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-butyl-3-methylimidazolium trifluoromethanesulfonate. The operation of the method is simple, the product made with the method is easy to purify and has high dissolvability (the product can be dissolved in regular solvents of N, N-dimethylacetamide, or tetrahydrofuran). The method has advantages of high yield, stable performance, good application prospect, and is suitable for industrialized production. Withthe method, polyimide films or fibers can be produced.

The invention discloses an absorbent for catching or separating dioxide carbon, which is an aqueous solution of monoethanolamine and 1-butyl-3-methylimidazolium tetrafluoroborate. The concentration of the monoethanolamine in the absorbent is 100-300 g / L, and the mass ratio of the monoethanolamine to the 1-butyl-3-methylimidazolium tetrafluoroborate is 0.5-3. The absorbent has high-efficiency CO2 absorbency, such as high dioxide carbon absorption efficiency and absorption capacity, as well as high oxidation resistance, high temperature resistance and resistance to impact load, i.e., good stability; in addition, the absorbent is easy to regenerate and has the advantages of economy and easiness for industrialization.

The invention discloses a method for measuring residual erythromycin in an environment by using a hydrophilic ionic-liquid aqueous two-phase system. The method comprises the following steps of: forming the ionic-liquid aqueous two-phase system by using 1.5 grams of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and 11 grams of NaH2PO4, at least extracting the solution for 2 hours once by using the extracting system, standing the solution after extraction, measuring the concentration of the residual erythromycin in the water phase after the split phases are clear, and calculating the extraction rate of the erythromycin by using the erythromycin content of the water phase before and after the extraction. According to the method, the extraction rate of the erythromycin can reach 99.31 percent. The method has the characteristics of wide linear range, low detection limit, small relative standard deviation and high measuring yield of a sample. The method can meet the national detection requirement for the residual erythromycin, is simpler to operate, and is suitable for quantitative analysis of residual trace erythromycin in food.

The invention provides a preparation method of anatase nanometer titanium dioxide with an exposed high-activity crystal surface. According to the method, isopropyl titanate is used as a titanium source; isopropanol and 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid are used as morphology control agents; acetic acid is used as a reaction solvent; the nanometer titanium dioxide is prepared by a solvothermal method. The anatase nanometer titanium dioxide containing rich {001} crystal surfaces is prepared by regulating the mole ratio of the acetic acid to the isopropyl titanate, the solvothermal reaction temperature and the solvothermal reaction time. The product prepared by the method has the advantages of high exposure rate of high-activity crystal surfaces {001}, safety, environment-friendly effect and the like.

The invention relates to a method for fast preparing small-particle-diameter anatase type nanometer titanium dioxide. The method comprises the following steps of (1) mixing deionized water and ethanediol to obtain a mixed solution of deionized water and ethanediol; using ammonium hydroxide for regulating the pH of the mixed solution into a basic state; then, gradually adding tetrabutyl titanate and 1-butyl-3-methylimidazolium tetrafluoroborate into the mixed solution drip by drip during the stirring so as to obtain the uniformly mixed reaction solution; (2) transferring the reaction solution obtained in the step (1) into a microwave reaction kettle for hydrothermal reaction; after the reaction is completed, performing centrifugation separation, washing and drying on the solid products; then, performing roasting to obtain the small-particle-diameter anatase type nanometer titanium dioxide. Under the condition of existence of a proper amount of ammonium hydroxide, the deionized water andthe ethanediol are used as the solvents; fluorine-containing ionic liquid is used for preparation so as to obtain the small-particle-diameter anatase nanometer titanium dioxide. In the synthesis process, only 10 to 30 min is needed; the time consumption is short; simplicity and convenience are realized; the production efficiency is high; the industrialization is facilitated.

The invention belongs to the field of modified carbon nanomaterials and discloses a preparation method of a two-dimensional porous boron-nitrogen double-doping carbon nanomaterial and application thereof. The preparation method disclosed by the invention comprises the following steps: taking urea as a structure template, taking 1-butyl-3-methylimidazolium tetrafluoroborate as a pore forming substance and a doping agent, taking glucose as a carbon source, calcining and performing hydrothermal treatment, thereby obtaining the product. The method disclosed by the invention is simple in operation,short in synthesis period, excellent in repeatability, low in cost and convenient for industrial implementation. The porous boron-nitrogen double-doping carbon nanosheets prepared by the method disclosed by the invention have a uniform and porous thin-layer structure and large specific surface area. Meanwhile, due to introduction of boron atoms, the conductivity is enhanced, the redox activity can be enhanced by virtue of doping of the nitrogen, and ay capacitance is improved. When serving as an electrode material of a supercapacitor, the carbon nanomaterial has high electrochemical energy storage activities including high specific capacitance and excellent cycling stability. When charging / discharging current density is 0.1A / g, the highest specific capacitance can reach 550F / g, and the specific capacitance is much higher than that of most of the carbon-based materials.

A gel polymer electrolyte comprises polyacrylonitrile, an ionic liquid, a lithium salt and mesoporous molecular sieve SBA-15; the ionic liquid is at least one selected from 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide; the lithium slat is at least one selected from lithium tetrafluoroborate, lithium hexafluorophosphate, lithium trifluoromethanesulfonate and lithium bis(trifluoromethanesulfonyl)imide; polyacrylonitrile is the base material, the lithium salt, the ionic liquid and mesoporous molecular sieve SBA-15 are dissolved in polyacrylonitrile; and the mass ratio of polyacrylonitrile, the ionic liquid, the lithium salt and mesoporous molecular sieve SBA-15 is 1:(0.8-1.5):(0.1-0.3):(0.04-0.08). The gel polymer electrolyte is relatively high in electrical conductivity. The invention also provides a preparation method of the gel polymer electrolyte.

The invention discloses a porous titanium dioxide photocatalyst film and a preparation method thereof. A substrate participates in an oxidizing reaction, an ionic liquid is taken as a template agent, and the reaction speed is controlled, so that a pure anatase phase titanium oxide film can be directly obtained on the surface of a titanium sheet. The preparation method comprises the following steps of: preparing a mixed solution of a hydrogen peroxide solution and an ionic liquid, i.e., 1-butyl-3-methylimidazolium tetrafluoroborate; soaking a metal titanium sheet into a reaction liquid for reacting in a baking oven of 80 DEG C for couple hours; and taking the reacted titanium sheet out, and baking to obtain a titanium dioxide film. The preparation method has the advantages of readily-available raw materials, simple process, easiness for controlling conditions, short preparing period and easiness for amplifying on a large scale. The prepared pure anatase structure titanium dioxide film high the advantages of high crystallinity, high purity, firm combination with the substrate, high stability and repeatability.

The invention discloses a preparation method for a Ti<3+> / TiO2 photo-catalyst with a hollow structure, belonging to the technical field of photocatalysis. The method comprises the following steps: by combining fluorine source control and a vacuum calcination method, and taking the ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate as a solvent and a microwave absorbing agent, compounding titanium dioxide with the hollow structure under a microwave-assisted heating condition, and then further modifying by adopting the vacuum calcination method, thereby compounding Ti<3+> / TiO2 with the hollow structure. The catalyst is applied to the field of removing water pollutant under the effect of visible light. The photo-catalyst disclosed by the invention can promote the visible light absorption, and meanwhile, a special shell structure is formed according to the vacuum calcination method, so that the catalyst has excellent recyclability in the photo-catalytic reaction. The preparation method is simple and feasible and is beneficial to large-scale popularization.

The invention relates to a method for purifying electron-grade hydrogen chloride. The method comprises the following steps: carrying out ion exchange between highly basic polystyrene macroporous ion exchange resin with sodium aluminum hydride NaAlH4 to generate an aluminum hydride resin adsorbent; loading 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, so that the performances of adsorbing hydrogen, carbon dioxide and other impurities are improved.

The invention relates to a method for preparing N-(3'-aryl allyl)pyrrole derivatives, which mainly comprises the following step of: reacting 3-aromatic (cycle) propenal with 4-acetoxyl-L-proline at the temperature of between 100 and 180DEG C (performing decarboxylation, redox amination and acetic acid removing aromatization) in an organic solvent such as N,N-dimethylformamide or ionic liquid such as 1-butyl-3-methylimidazolium tetrafluoroborate to obtain target objects. The method has the advantages of cheap and readily available raw materials, simple and practicable operation, high yield and the like.

The invention provides a flame-retardant graphene composite plastic material for household appliances and a preparation method thereof. The method comprises the following steps: adding graphene oxideand ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate to water to prepare a mixture, sequentially adding an aqueous solution of phosphotungstic acid and hydrazine hydrate for a reaction to obtain a graphene-ionic liquid modified phosphotungstate hybrid, mixing the material with styrene-butadiene rubber particles, ethylbenzene, styrene, acrylonitrile, and an initiator, and heating a mixture for a reaction to obtain the flame-retardant graphene composite plastic material for household appliances. The method provides the composite plastic having excellent flame-retardant performance by adding the graphene-ionic liquid modified phosphotungstate hybrid when in-situ polymerization of an ABS monomer is carried out, the flame-retardant graphene composite plastic material is halogen-free,highly efficient, and non-toxic, and does not cause adverse effects on the environment and human health, and is the ideal material for the preparation of home appliance casings.

The invention relates to the technical field of waste gas treatment, in particular to a novel VOCs absorbent and a preparation method thereof. The novel VOCs absorbent is prepared from, by weight, 50-80 parts of biodiesel, 8-30 parts of a non-ionic surfactant, 4-15 parts of a cosurfactant, 0.5-5 parts of camphene, 4-12 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, 3-8 parts of 1-butyl-3-methylimidazolium tetrafluoroborate and an appropriate amount of water. The prepared novel absorbent has high absorption efficiency for low-concentration organic waste gas, and the absorbent after waste gas treatment can be directly used as fuel for combustion, and the environmental and economic benefits are good.

The invention relates to a method for preparing rare-earth fluoride nanometer mesoporous spheres, and belongs to the technical field of the preparation process of inorganic nanometer materials. The method comprises the following key points of: mixing ionic liquid purchased at the market, such as typical 1-butyl-3-methylimidazolium tetrafluoroborate and absolute ethyl alcohol serving as an organic solvent in a volume ratio of 1:1-1:3 for ultrasonic processing for 5 to 10 minutes; dissolving rare-earth compounds in the mixed solution for stirring for 10 to 48 hours at the temperature of between 10 and 40 DEG C or ultrasonic processing for 1 to 6 hours, wherein the molar ratio of the using amount of the rare-earth compounds to the ionic liquid is 1:10-1:40; performing centrifugal separation on products, and washing the separated products by using deionized water and the absolute ethyl alcohol; and drying the washed products at the temperature of 60 DEG C to prepare the rare-earth fluoride nanometer mesoporous spheres finally. In alcoholic solution of the rare-earth fluoride nanometer mesoporous spheres, the prepared products have a structure of the mesoporous spheres formed by accumulating nanometer granules, the diameter of the rare-earth fluoride nanometer mesoporous spheres is between 50 and 200 nanometers, and the bore diameter is less than 5 nanometers. The products can be applied in the fields of catalysis, biology, medicine and photics.

The invention relates to an 18beta-glycyrrhetinic acid molecularly imprinted polymer with metal ions as a bridging agent and a monolithic column. The polymer is used as an adsorbing agent for solid phase extraction and separation of glycyrrhetinic acid epimers. The polymer is prepared from 1.55-4.12% of 18beta-glycyrrhetinic acid, 0.82-2.18% of cobaltous acetate, 2.73-2.80% of 4-vinyl pyridine, 0.26-0.32% of azodiisobutyronitrile, 15.63-31.25% of ethylene glycol dimethacrylate, 43.28-43.80% of 1-butyl-3-methylimidazolium tetrafluoroborate, 3.18-3.59% of N,N-dimethylformamide and 18.47-20.01% of dimethyl sulfoxide. Compared with an imprinted polymer with no metal ion, the imprinting factor of the polymer synthesized through the method is improved by about 3 times, and the polymer is dried, ground and screened (74 micrometers) to be used as an adsorbing agent to be placed into an SPE column for carrying out separation and enrichment on 18beta-glycyrrhetinic acid in glycyrrhetinic acid crude extract. The recovery rate of the obtained sample is 91.1%, and the purity of the obtained sample is 93.8%. Accordingly, the polymer can be used for separation, purification and enrichment of the glycyrrhetinic acid crude extract.

The invention discloses a water-soluble corrosion inhibitor. The water-soluble corrosion inhibitor is prepared by the method comprising the following steps: step 1, pouring palmitic acid, a catalyst,methylbenzene and zeolite into a reaction kettle, stirring, heating to reach 80 DEG C, pouring N-phenyl ethylenediamine, and heating to obtain an oil-soluble intermediate; step 2, mixing the oil-soluble intermediate with bromomethane, carrying out backflow, and carrying out a quaternization reaction to obtain a water-soluble intermediate; step 3, mixing the water-soluble intermediate with 1-butyl-3-methylimidazolium tetrafluoroborate to obtain a modified intermediate; and step 4, mixing the modified intermediate with dodecyl benzyl ammonium chloride and octaphenyl polyoxyethyiene, and then dissolving the mixture into an organic solvent with an equal mass to obtain the water-soluble corrosion inhibitor. The water-soluble corrosion inhibitor is high in dispersibility in raw material oil; anda compact and firm protection film is formed on the surface of an oil field pipeline, so that the corrosion of the raw material oil to the oil field pipeline is effectively prevented.

The invention discloses a method for preparing Ni-Fe hydroxide nanometer films through electrodeposition. According to the method, cyclohexanol is used as an oil phase, TX-100 is used as a surfactant, 1-butyl-3-methylimidazolium tetrafluoroborate is used as a cosurfactant, an aqueous solution of Ni(NO3)2 and Fe(NO3)3 is used as an aqueous phase, antiphase quaternionic ionic liquid microemulsion with higher conductivity is prepared, then the microemulsion is used as electrolyte, and the Ni-Fe hydroxide nanometer films are prepared by an electrodeposition method. According to the method disclosed by the invention, the 1-butyl-3-methylimidazolium tetrafluoroborate is added to the microemulsion, so that the conductivity property of the microemulsion is improved, and the electrodeposition efficiency is improved; the 1-butyl-3-methylimidazolium tetrafluoroborate is used as the cosurfactant to participate in the formation of micro micelles, and is used as a soft template agent to prevent nanometer particles from clumping, so that the size of a microreactor can be effectively controlled, further the size of Ni-Fe hydroxide is controlled, the catalysis specific surface areas are effectively increased, and the catalytic property of the Ni-Fe hydroxide as a water decomposition anode catalyst is improved.

An ionic liquid-assisted method for preparing curdled In2S3 nanomaterials. Add a certain amount of water into the liner of the polytetrafluoroethylene high-pressure reactor, and then add an appropriate amount of In(NO 3 ) 3 4.5H 2 O, Thioacetamide and 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim]BF 4 ionic liquid. After stirring evenly, put it into a reaction kettle, react at 160°C for a period of time, and then cool naturally to room temperature. The obtained precipitates were ultrasonically washed with distilled water and absolute ethanol several times, and dried in vacuum at 60°C for 8 hours. The method uses an aqueous solution of an ionic liquid as a reaction medium, and belongs to an environment-friendly reaction. The method is simple to operate, has no pollution to the environment, has good repeatability, and the crystal form and shape of the obtained microsphere material are perfect, and has certain application value.

The invention discloses an ion liquid assisted magnesium lithium alloy anodic oxidation film forming method. The method comprises the following steps: magnesium lithium alloy workpieces are used as anodes, and stainless steel or lead plates are used cathodes; ion liquid is fed in a sodium silicate electrolyte system; a constant-current mode or a constant-pressure mode is adopted for anodic oxidation; gaps between the anodes and the cathodes are controlled with 1-10 cm; the anodic oxidation time is within 10 min to 1 h, and the temperature is 5-25 DEG C; the cleaning and the drying are performed after the anodic oxidation to prepare the magnesium lithium alloys after the anodic oxidation; and the ion liquid is 1-butyl-3 methylimidazolium tetrafluoroborate, 1-caproyl-2, 3-dimethylimidazole fluophosphate or N-ethyl pyridine tetrafluoroborate. The method achieves excellent film forming performances, can prepare uniform and compact white oxide films, and is excellent in bonding force between film layers and basal bodies, excellent in corrosion resistance, excellent in wear resistance, simple in preparation process and low in energy consumption.

The invention provides an ionic liquid modified urate oxidase enzyme membrane and a preparation method thereof, and belongs to the technical field of an electrochemical biosensor and preparation thereof. The enzyme membrane uses a nitrocellulose membrane as a substrate membrane, and is loaded with urate oxidase, ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate and crosslinking agents of glutaraldehyde. The preparation method of the enzyme membrane comprises the following steps that the nitrocellulose membrane is soaked into a PBS (phosphate buffer solution) and is then dried through being blown by N2; next, the nitrocellulose membrane is fixed by an O ring; the urate oxidase, glutaraldehyde and 1-butyl-3-methylimidazolium tetrafluoroborate solution is subjected to mixed crosslinking; next, a mixed solution is taken and is dripped and coated onto the nitrocellulose membrane; after the drying, the enzyme membrane provided by the invention is obtained. The ionic liquid modified urate oxidase enzyme membrane has the advantages that the ionic liquid effectively improves the electric conductivity of the enzyme membrane; the current response time is shortened; the enzyme membrane is used for uric acid detection, and has the advantages of wide linear range, high sensitivity and good stability; in addition, the method is simple; the implementation is easy; the cost is low.

The invention discloses a preparation method of econazole nitrate. The preparation method comprises the steps of with 1-(2,4-dichlorophenyl)-2-(1-imidazolyl)ethanol (imidazole ethanol for short) and p-chlorobenzyl chloride as raw materials, Ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmin]BF4) as a solvent and an in-phase reaction catalyst, tetrabutylammonium bromide (TBAB) as a phase transfer catalyst, isopropanol as a solvent and anhydrous potassium carbonate as a basic catalyst, carrying out O-alkylation reaction, acidification and recrystallization, so as to obtain econazole nitrate. The preparation method is simple and convenient in operation, mild in reaction conditions and high in yield, the purity of prepared econazole nitrate is higher than 99.9%, and the preparedeconazole nitrate has very high industrial application values.

The invention relates to a preparation method of a chicoric acid imprinted monolithic column. The method comprises the following steps: adopting chicoric acid as a template, adding zinc acetate or cobalt acetate, using N,N-dimethyl formamide, dimethyl sulfoxide and 1-butyl-3-methylimidazolium tetrafluoroborate as a pore-foaming agent, then adding a functional monomer, a cross-linking agent or an initiator, then ultrasonically dissolving to remove dissolved oxygen, initiating the reaction, and finally obtaining the chicoric acid imprinted monolithic column with selectivity. By adopting the preparation method, the consumption of templates is less, and the imprint cost of the chicoric acid is greatly reduced. The chicoric acid imprinted monolithic column and a blank reference column are successfully synthesized in a stainless steel column tube, and the chromatographic performance optimization is carried out. Experiment results prove that imprinting factors are up to 24.81. The method is simple in preparation; and the macromolecular polymer is good in durability, and a cost-saving method is provided for the separation and purification of chicoric acid (the purity is higher than 98.5 percent).

A polybenzimidazole solution comprises a polybenzimidazole dissolved in an ionic liquid excluding 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium hydroxide, and 1-butyl-3-methylimidazolium tetrafluoroborate. The ionic liquid may be a salt having a melting point less than or equal to 100° C. The salt having a cation (+) and an anion (−). The cation may be selected from the group consisting of: choline, ammoniums, phosphoniums, pyridiniums, pyrrolidiniums, morpholimiums, pyrazoliums, sulfoniums, imidazoliums. The anion may be selected from the group consisting of: halides, bis(triflyl)amide, CF3SO3−, hydroxides, nitrates, sulfates, acetates, cyanates, aluminates, borates, phosphates, phosphorates, alkylsulfates, tosylates.

The invention provides a Pd / PdO nano particle loaded carbon nano tube composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking a mixture of carbon nano tubes, palladium nitrate bihydrate and 1-butyl-3-methylimidazolium tetrafluoroborate as a cathode of gas-liquid glow plasma reaction, reacting under the electrification conditions of 220-600V and 1-3mA under an argon atmosphere of 210-1000Pa for 5-20 minutes, and preparing to obtain a crude product; washing, performing ultrasonic and centrifugal separation and drying the crude product, thereby obtaining the Pd / PdO nano particle loaded carbon nano tube composite material. The Pd / PdO nano particle loaded carbon nano tube composite material provided by the invention is prepared by the method. The invention also provides application of the Pd / PdO nano particle loaded carbon nano tube composite material serving as a catalyst in a reaction of reducing 4-nitrophenol into 4-aminophenol.

The invention provides a method for preparing a Dy-Ni alloy film through low temperature electrodeposition. 1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium hexafluorophosphate are mixed according to a mass percent ratio and used as molten salt. The molten salt is heated to 30 to 60 DEG C. A solute is added to the molten salt under stirring, and then stirred for 6 to 8h to acquire molten salt intermediate liquid. Finally, a Pt piece is used as an inert anode, and a high pure copper piece is used a cathode. The molten salt intermediate liquid is electrified for electrolysis, and the current density is controlled to be 0.01 to 0.1 A / cm<2> during electrolysis. The electrolysis time is 1 to 2 h. The Dy-Ni alloy film is acquired on the surface of the cathode. The method provided by the invention has the advantages of simple equipment, low energy consumption, low cost, simple operation, short preparation time, easy control of the thickness range and the like.

The invention discloses a preparation method of a TiO2-Graphene composite material. The method comprises the steps of preparing a graphene oxide (GO) solution from flaky graphite as a raw material; fully mixing 1-butyl-3-methylimidazolium tetrafluoroborate, glacial acetic acid and water, dropwise adding tetrabutyl titanate, carrying out magnetic stirring until the solution is bright white, carrying out ultrasonic treatment until the solution is colorless and transparent, carrying out treatment by using a microwave-assisted ionic heat method, washing an obtained TiO2 sample by deionized water and absolute ethyl alcohol for multiple times separately and drying for use; and respectively weighing different quantities of GO and TiO2 for fully mixing, carrying out homogeneous ultrasonic dispersion, carrying out treatment by using a microwave-assisted hydrothermal method, washing the obtained sample by the deionized water and the ethyl alcohol for multiple times separately, carrying out vacuum drying and then obtaining the TiO2-Graphene composite material of different ratios. According to the preparation method of the TiO2-Graphene composite material, the TiO2-Graphene composite material is obtained through microwave-assisted methods; the method is simple and easy to operate, high in reaction speed and short in synthesis time; and the obtained product is high in purity, good in repeatability, high in practicability and low in cost.

The invention discloses a fluorine-containing iodo-hydrocarbon composition. The composition comprises the following components in parts by weight: 16.1-27.6 parts of heptafluoro-2-butene, 1.6-3.6 parts of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, 60-80 parts of 2,3,3,3-tetrafluoropropene, 0-10 parts of iodotrifluoromethane and 0-0.06 part of 1,5-hexadienol. The invention also discloses a preparation method of the fluorine-containing iodo-hydrocarbon composition. The fluorine-containing iodo-hydrocarbon composition has the advantages of simple process, low cost, environment friendliness and good product flame retardance.

The invention discloses a synthesizing method of polyimide. The method comprises the following step that: an aromatic diamine compound and an aromatic dianhydride compound are subject to a polymerization reaction in an ionic liquid, such that polyimide is obtained. The ionic liquid can be any one of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-butyl-3-methylimidazolium trifluoromethanesulfonate. The operation of the method is simple, the product made with the method is easy to purify and has high dissolvability (the product can be dissolved in regular solvents of N, N-dimethylacetamide, or tetrahydrofuran). The method has advantages of high yield, stable performance, good application prospect, and is suitable for industrialized production. Withthe method, polyimide films or fibers can be produced.