44 results about "Alkali salt" patented technology

The present application relates to the technical field of chemical medicine preparation, and particularly relates to a preparation method of tetrabromophenol tetrahalosulfonophthalein, which is prepared from 3,4,5,6-tetrahalophenol sulfonophthalein as raw material, organic carboxylic acid in aqueous solution, liquid bromine, oxidation by hydrogen peroxide to obtain tetrabromophenol tetrahalosulfonophthalein crude product, then salification with alkali salt in an aprotic solvent to obtain tetrabromophenol tetrahalosulfonophthalein salt; and then acid conversion with organic carboxylic acid in aqueous solution, recrystallization to obtain tetrabromophenol tetrahalosulfonophthalein pure product; the present application provides a preparation method of tetrabromophenol tetrahalosulfonophthalein, which is low in cost, high in yield and purity, simple in method, mild in condition, high in yield and purity, and beneficial to mass production.

A process for upcycling a polymeric waste material containing a polyarylethersulfone (PAES polymer) having less than 20 mol% reactive end groups, comprising depolymerizing the PAES polymer in the presence of a phenolic nucleophile and an alkali salt-forming carbonate agent in a polar aprotic solvent to obtain a PAES reactive macromer of lower molecular weight which is recovered. A composite comprising a resin matrix, reinforcing fibers and the PAES reactive macromer. An article made from a self-crosslinking PAES reactive macromer. Such a PAES reactive macromer contains more than 60 mol% of reactive end group(s) Ref, at most 20 mol% halide end group(s) X, and at most 20 mol% of unreactive end group(s) Ne, based on the total amount of moles of end groups. Preferably, Ref contains at least one group selected from –OH, -NH2, -COOH, –C≡CH, –C≡C–Ar, and / or an OH group connected to –Ara--W-Ara-, wherein Ar is an aryl group, Ara is an allyl-substituted aryl group, and W is a single bond, –C(CH3)2– and / or –SO2–. Preferably, Ne is an alkoxy group, such as methoxy, and X is Cl.

The present invention relates to a polymerizable solution for impregnating wood, a method for impregnating wood with said solution and impregnated wood impregnated with said solution. The polymerizable solution comprises: - furfuryl alcohol in the range from 25 to 75 weight% based on the total weight of the solution, - carboxylic acid in the range from 0.01 to 0.15 mol / kg based on the total weight of the solution, - maleic anhydride in the range from 0.25 to 4 weight% based on the total weight of the solution, - condensate from a previous curing process of wood in the range from 24 to 74 weight% based on the total weight of the solution, and - an amount of water-soluble alkali salt to obtain a pH in the range from 3 to 5 at the time point when the solution is made.

Disclosed are a crystalline form of a high-stability nor-ursodeoxycholic berberine salt and a preparation method therefor, while relate to the field of pharmaceutical chemistry. The crystalline form has the following structural formula. In X-ray powder diffraction of the crystalline form, a 2θ diffraction angle has characteristic peaks at 3.54+ / -0.2 degrees, 7.13+ / -0.2 degrees, 13.14+ / -0.2 degrees, 15.95+ / -0.2 degrees, 16.40+ / -0.2 degrees, 18.64+ / -0.2 degrees, 24.90+ / -0.2 degrees, 25.76+ / -0.2 degrees and 26.30+ / -0.2 degrees. Compared with other crystalline forms of the nor-ursodeoxycholic berberine salt, the crystalline form has more excellent stability, and has a good application prospect in the preparation of high-quality solid chemical drugs.

The utility model relates to the technical field of electronic wires, in particular to an anti-corrosion electronic wire which comprises a battery core conductor, a spiral groove is arranged on the outer side surface of the battery core conductor, conductive gel containing benzotriazole is filled in the spiral groove, a conductive layer is sleeved on the outer side of the battery core conductor, a chemical passivation layer is arranged on the outer side of the conductive layer, and an anti-corrosion layer is arranged on the outer side of the chemical passivation layer. The outer side of the chemical passivation layer is sleeved with a physical blocking layer, the outer side of the physical blocking layer is provided with a fireproof mica layer, the outer side of the fireproof mica layer is sleeved with a shielding layer, the outer side of the shielding layer is sleeved with an armor layer, and the outer side of the armor layer is sleeved with an anti-corrosion sheath. Through the synergistic effect of the chemical passivation layer and the four-layer composite anti-corrosion sheath (the W61-3 organic silicon coating, the graphene epoxy coating, the nano modified layer and the PTFE glass fiber composite layer), a chemical and physical dual protection system is formed, the cable can resist complex corrosion environments such as acid, alkali, salt and humid and hot atmosphere, and the protection life is prolonged by more than three times.

The application provides a method for modifying DPP pigment with a tertiary butyl alcohol alkali salt, which uses DPP pigment as raw material, and also uses a tertiary butyl alcohol alkali salt, carbon dioxide and sulfonyl chloride as raw material; and uses an aprotic solvent as solvent; the method first synthesizes a salt containing a tert-butyloxycarbonyl group, and then uses the tert-butyloxycarbonyl group in the salt to modify an imino group in a DPP pigment molecule to obtain a modified DPP pigment. The application uses DPP pigment, a tertiary butyl alcohol alkali salt, carbon dioxide and sulfonyl chloride as raw material, uses an aprotic solvent as solvent, uses a unique molecular structure design, synthesizes a tert-butyloxycarbonyl group to directly modify an imino group on a DPP pigment molecule to achieve the purpose of chemical modification; the side reaction is low, and the generated by-product can be removed by water washing, and will not affect the performance of the parent pigment.

Aqueous gel, its use in cosmetics and process to reduce the sticky effect felt during its application. Aqueous gel comprising from 0.5% wt to 5.0% wt of a crosslinked anionic polyelectrolyte (PA) comprising from 5.0% mol to 95.0% mol of monomeric units from 2-methyl-2-((1-oxo-2-propenyl)amino)-1-propanesulfonic acid partially or totally salified as an alkali salt or ammonium salt, from 4.9% mol to 90.0% mol of monomeric units of N,N-dialkylacrylamide and from 0.1% mol to 5.0% mol of monomeric units from a monomer of formula CH2=C(CH3)-C(=O)-O-(CH2-CH2-O-)n-R5; from 0.5% mass to 9.5% mass, either of an alkanol of formula R1-OH, or of a mixture of alkanols of formula R1-OH; or of a composition (C) of alkyl polyglycosides represented by the formulas R1-O-(G)xH, in which G represents either the remainder of glucose or the remainder of xylose and x represents a decimal number between 1.05 and 2.05;either a mixture (M) of said alkanol of formula R1-OH or of said mixture of alkanols of formula R1-OH and of said composition (C); from 0.0% mass to 3.0% mass one or more cosmetic active ingredients and the quantity of water necessary to make up to 100% mass in which the mass ratio (RM) having as numerator the mass of the alkanol(s) of formula R1-OH, or the mass of said composition (C) or the mass of said mixture (M) and as denominator, the mass of said cross-linked anionic polyelectrolyte (PA), is greater than or equal to 1 and less than or equal to 10; cosmetic skin care process using said aqueous gel; use, either of said alkanol of formula R1-OH, or of a mixture of alkanols of formula R1-OH, or of said composition (C) or of said mixture (M), with a view to reducing or eliminating the sticky effect felt when applying to the skin an aqueous gel comprising said anionic polyelectrolyte (PA);process for reducing or eliminating the sticky feeling experienced when applying an aqueous gel comprising said anionic polyelectrolyte (PA) to the skin by modifying its composition before application to the skin, by adding either the alkanol(s) of formula R1-OH, or said composition (C), or said mixture (M).;

The application provides a Cd-Ni3S2 / NF composite material and a preparation method and application thereof. By adopting the preparation method provided in the application, by regulating the molar quantity of a cadmium source, a nickel salt, an alkali salt, ammonium fluoride and a sulfur source within the range of the application, and the reaction temperature and time in steps (2)-(3), the Cd-Ni3S2 / NF composite material obtained has HER and OER dual-function electrocatalytic activity.

The invention belongs to the technical field of ocean engineering structure durability research, and discloses a test method for simulating the bonding durability of an FRP (Fiber Reinforce Plastic) rib in an actual service environment of an ocean concrete structure. Comprising the steps of carrying an FRP rib with a crack channel and a concrete bonding test piece, accelerating a corrosion device and calculating the time of leading a member concrete crack to the FRP rib. A loading support is installed at the loading end of the bonding test piece, and a force application nut is rotated to apply a load to a required value. A loading test piece is placed on a water tank supporting frame filled with seawater, after the test piece is soaked for theoretical time, a port of a U-shaped pipe is opened to enable seawater to flow through the U-shaped pipe, seawater is simulated to seep to an FRP rib bonding interface through a concrete crack, and the whole process that the corrosion mode of the FRP rib is evolved from an alkaline environment to an alkali-salt coupling environment is achieved. The method effectively solves the problem of unreliable test conclusion caused by large difference between the corrosion state of the bonding interface of the FRP rib and the corrosion environment in a maritime work structure actually serving in the ocean in a traditional accelerated corrosion test.

Process for treating keratinous materials employing at least one polysaccharide compound with acetoacetate functional groups. The present invention relates to a process for treating keratinous materials, comprising applying to said keratinous materials, in one or more successive steps, at least i) one or more compounds of formula (I) as well as their optical and geometric isomers, their acid or base salts, and / or solvates, such as hydrates, or a composition containing them: (I) formula (I) in which X, R1, R2, Ra, Rb, and n are as defined in the description, optionally ii) at least one crosslinking agent, iii) optionally water. Figure for the abstract: None

The application provides a kind of alkaline deruster and its preparation method, belong to metal surface treatment technical field.The alkaline deruster includes: base mother liquor, alkali salt, surfactant and water;The base mother liquor includes organic acid, chloride and fluoride.The alkaline deruster provided in the application does not contain volatile inorganic acid such as phosphate acid, does not contain heavy metal or harmful substance, is friendly to environment, the alkaline deruster can simplify three processes of oil removal, water washing and rust removal into one process, greatly improves production efficiency;The alkalinity of the alkaline deruster is alkaline, and the position of weld seam, clamping seam and pipe, etc. after pickling of workpiece is prone to residual reagent, and the position will not appear re-rust phenomenon caused by strong acidic derusting, corrosion is low, and has no irritating smell.

The invention discloses application of a boron and alkali metal salt composite synergistic system in ring-opening polymerization and copolymerization, and belongs to the field of polymer synthesis. The invention provides a dual-core or multi-core boron Lewis acid-base pair catalytic system, and particularly relates to a QC-B1 / potassium tert-butoxide / 18-C-6, CAT-B2 / potassium tert-butoxide / P5Cl and POSS-B8 / potassium tert-butoxide / P5Cl acid-base composite system, which can efficiently and controllably realize the copolymerization of epoxide and CO2 and the homopolymerization of epoxide. And carrying out copolymerization on the epoxide and CO2 to obtain the low-molecular-weight and end-functionalized polycarbonate. According to the invention, the synthesis of polycarbonate is realized by adopting a potassium alkoxide / ether or potassium alkoxide / phosphazene salt composite system and binuclear or multi-nuclear organic boron, and the problems of complex synthesis and high price of onium salt and phosphazene base halogen and phosphazene in the prior art are solved.

An environmentally-clean fire inhibiting liquid biochemical composition for application on combustible surfaces to inhibit fire ignition and flame spread in the presence of fire. The environmentally-clean fire inhibiting liquid biochemical composition including a dispersing agent realized in the form of a quantity of water, for dispersing metal ions dissolved in water; a fire inhibiting agent in the form of at least one alkali metal salt of a nonpolymeric saturated carboxylic acid, for providing metal ions dispersed in the water when the alkali metal salt of a nonpolymeric saturated carboxylic acid is dissolved in the quantity of water; and a coalescing agent in the form of an organic compound containing three carboxylic acid groups, or salt / ester derivatives thereof, specifically triethyl citrate (TEC), an ester of citric acid, for dispersing and coalescing the metal ions when the fire inhibiting liquid composition is applied to combustible surfaces to be protected against fire, while water molecules in the water evaporate to the environment during drying, and the metal ions cooperate to form thin alkali metal salt crystalline coatings on the combustible surfaces. The alkali metal salt of nonpolymeric saturated carboxylic acid may be selected from the group consisting of: alkali metal salts of citric acid; alkali metal salts of oxalic acid; alkali metal salts of gluconic acid; and alkali metal salts of tartaric acid. The alkali metal salt of nonpolymeric saturated carboxylic acid may be selected from the group consisting of the alkali salt of lithium, the alkali salt of sodium, the alkali salt of potassium, the alkali salt of cesium and the alkali salt of rubidium. Preferably, the alkali metal salt of nonpolymeric saturated carboxylic acid is an alkali salt of potassium, namely tripotassium citrate (TPC).

The present application belongs to the technical field of environmental protection and solid waste recycling, and particularly relates to a method for passivating, completely removing alkali and retaining valuable metal components of red mud. The present application limits the precise alkali removal acid amount by an acid amount formula, creates a weak acid reaction environment, and limits only the alkali substances contained in the red mud to participate in the neutralization reaction by controlling the passivation agent amount, liquid-solid ratio, stirring time and temperature and other parameters, to generate alkali salt dissolved in water, and then separates and discharges the alkali salt by filtration to prepare the alkali-removed red mud filter cake. During the whole reaction process, the metal oxide components such as Fe2O3 and TiO2 are basically completely retained in the alkali-removed red mud filter cake due to the weak acid environment and the passivation and oxidation of the passivation agent. The alkali-removed red mud obtained by the present application contains zero alkali and increased iron content, and can be directly used as fine iron powder or catalyst, adsorbent, building material, roadbed material and the like.

The invention relates to a preparation method of lithium bis (fluorosulfonyl) imide liquid salt, which comprises the following steps: step 1, reacting hexamethyldisilazane, fluorosulfonic acid and organic alkali serving as raw materials in the presence of a first solvent and in an inert gas atmosphere, and removing a reaction solvent by reduced pressure distillation after the reaction is finished, washing the concentrated solution with water, and drying to obtain organic alkali salt of bis (fluorosulfonyl) imide; and 2, reacting the organic alkali salt of the imidodisulfuryl fluoride with an alkaline lithium source in the presence of a second solvent, and after the reaction is finished, filtering, crystallizing and drying to obtain the high-purity lithium imidodisulfuryl fluoride, and 3, adding the obtained lithium bis (fluorosulfonyl) imide into DMC (dimethyl carbonate), and dissolving to prepare a DMC solution with the concentration of about 30% so as to obtain the lithium bis (fluorosulfonyl) imide liquid salt. The method overcomes the problems of high production cost, complex process, low yield and purity and the like caused by production of a large amount of water, acid gas and organic matters in the preparation process of the lithium bis (fluorosulfonyl) imide liquid salt and many purification steps in the prior art.

The present invention relates to the use, in particular cosmetic use, of azelaic acid, an organic or inorganic base salt thereof, a solvate thereof, or mixtures thereof, to increase the longevity of skin cells.

The application belongs to the field of alkali salt activated inorganic non-metallic cementitious materials, and particularly relates to a kind of alkali salt activated carbon sequestration cementitious materials based on recycled micro powder, which comprises, by mass fraction, 40-50 parts of recycled micro powder, 20-40 parts of blast furnace slag, 10-20 parts of steel slag, 5-8 parts of alkali salt activator, 5-10 parts of inorganic cementing aid, and 0.0005-0.002 parts of reaction activity promoter.The alkali salt activator is Na2CO3; the inorganic cementing aid is MgO; and the reaction activity promoter is basic magnesium carbonate tetrahydrate.The alkali salt activated carbon sequestration cementitious material based on recycled micro powder mainly utilizes recycled micro powder, slag and steel slag generated in the process of urban demolition, and can absorb a part of CO2 during the curing process and improve its compressive strength.

The present application belongs to the technical field of analytical chemistry, and particularly relates to a method for determining the content of hafnium in hafnium carbide. The method comprises the steps of sample weighing, high-temperature melting, dissolution and leaching, primary precipitation separation, precipitation dissolution, secondary precipitation separation and constant weight calculation, and uses mandelic acid as a secondary precipitant and a mixture of alkali salt and boric acid as a high-temperature flux. The method provided by the present application is simple in equipment, scientific, fast, reasonable and reliable in determination, and effectively fills the gap in the field of chemical composition detection of internal hafnium carbide materials.

The application relates to the technical field of non-ionic oxidized polyethylene wax emulsion, and particularly discloses a non-ionic oxidized polyethylene wax emulsion saponified by an alkali salt and a preparation method of the emulsion. The emulsion comprises the following components in parts by weight: 30-34 parts of oxidized polyethylene wax, 6-10 parts of fatty alcohol polyoxyethylene ether, 0.15-0.4 parts of an alkali salt, 0.2-0.4 parts of an electrolyte and 59-60.9 parts of water; the alkali salt is potassium carbonate or sodium carbonate. In the application, the alkali salt is used to replace traditional strong alkali and organic alkali as a saponifying agent, carboxylate anions are generated in situ on the surface of wax molecules through a mild saponification reaction, and the emulsion is emulsified in cooperation with non-ionic emulsifiers, so that the occupational health and fire safety risks of the emulsion are significantly reduced; the obtained emulsion is small in particle size, excellent in storage stability, free of yellowing and odor, suitable for industrialized continuous large-scale production, and widely applied to the fields of coatings, inks, varnishes and galvanized plate passivation treatment and the like.

According to the method, hericium erinaceus with a natural three-dimensional porous structure is selected as a novel biomass carbon source, the characteristic that the hericium erinaceus is rich in protein and amino acid is utilized, K2CO3 is introduced as an activating agent, low-temperature carbonization and high-temperature activation are conducted, and self-doping of O and N in the carbon material is achieved; the moderate activation strength of K2CO3 of the weak base salt is utilized to successfully construct a micro-mesoporous graded multi-stage pore structure, and beneficial oxygen-containing functional groups are introduced to the surface of the material; wherein the comprehensive performance of the LMMO (1: 3) is optimal, the specific capacity of the LMMO (1: 3) can reach 320F g <-1 > at the scanning rate of 2mV s <-1 > in a 6mol L <-1 > KOH electrolyte, and meanwhile, the LMMO (1: 3) shows excellent rate capability; the constructed LMMO (1: 3) / / LMMO (1: 3) symmetric supercapacitor shows the energy density of 28.9 Wh kg <-1 > when the power density is 130W kg <-1 >, and can still keep the specific capacity of 107% after 10000 times of circulation at the scanning rate of 100mV s <-1 >. The invention provides a new thought for the design of a high-performance supercapacitor electrode material.

The invention discloses a preparation method of a drug intermediate 8-(2-benzamido) sodium caprylate, which comprises the following steps: in the presence of a solvent A or a catalyst, reacting salicylamide with triethyl orthoformate to obtain a compound I-1; (2) in the presence of alkali and a solvent B, carrying out substitution reaction on the compound I-1 and 8-bromocaprylic acid tert-butyl ester to obtain a compound I-2; (3) in the presence of an acid and a solvent C, carrying out a deprotection reaction on the compound I-2 to obtain a compound I-3; and (4) in the presence of a solvent D, reacting the compound I-3 with alkali salt of sodium to obtain the compound I. The method provided by the invention has the advantages of high yield, high selectivity, low production cost, few byproducts, easiness in industrial production and environmental friendliness.

The invention relates to a method for preparing cellulose derivatives which are reversibly cross-linked with glyoxal and thus display delayed water solubility. In the methods, a water-wetted cellulose derivative is mixed at a temperature of between 20 to 70° C. with an aqueous solution containing glyoxal, a monovalent or polyvalent organic acid, and at least one alkaline earth salt and / or alkali salt of phosphoric acid as a buffer substance to reversibly crosslink the cellulose derivative. The amount of glyoxal is 0.010 to 0.050 mol, in each case in relation to 1 mol of anhydroglucose units of the cellulose derivative, and the molar ratio of monovalent or polyvalent organic acid to glyoxal is in the range of 1:1 to 1:12. The cellulose derivative is then dried and milled, and the drying and milling may also be combined. The invention also relates to cellulose derivatives produced according to the method.

The utility model relates to an acid, alkali and salt resistant resin tile, and belongs to the technical field of resin tiles. The acid, alkali and salt resistant resin tile comprises a resin tile, the splicing mechanism used for rapid splicing and alignment is arranged on the outer side of the resin tile; wherein the splicing mechanism comprises a butt joint groove formed in the outer side of the resin tile, a butt joint assembly is arranged on the side, away from the butt joint groove, of the resin tile, and a reinforcing assembly is arranged on the outer side of the resin tile; by arranging the butt joint grooves and the butt joint assemblies, rapid splicing and accurate alignment of the resin tile are achieved, the rain leakage problem is avoided, the construction efficiency is improved, the reinforcing assemblies enhance the bending resistance of the tile body, warping or sinking is prevented, the corrosion protection layer resists acid, alkali and salt mist corrosion, the service life is prolonged, and the force bearing composite core layer improves the impact resistance and disperses loads; the reverse osmosis supporting layer prevents water vapor and salt from permeating, the sealing performance and the weather resistance are enhanced, and the three-layer structure cooperatively guarantees the anti-corrosion performance, the pressure-bearing performance and the anti-seepage performance of the resin tile.

The application discloses a kind of 4,16 bis (m-methoxyphenyl) -[2,2] -p-xylene ring diatomic for preparing parylene coating resistant to electrochemical corrosion and its preparation method and application, specifically relates to a kind of 4,16 bis (m-methoxyphenyl) -[2,2] -p-xylene ring diatomic, its preparation method includes the following steps: S1, p-xylene ring diatomic is reacted with liquid bromine in the presence of catalyst, first solvent, and intermediate 1 is obtained;S2, intermediate 1 is reacted with 3-hydroxyphenylboronic acid in the presence of base salt, palladium catalyst and second solvent, and intermediate 2 is obtained;S3, intermediate 2 is reacted with methylating agent in the presence of base salt, third solvent, and the ring diatomic monomer is obtained.The phenyl parylene coating prepared from the above monomer shows excellent resistance to electrochemical corrosion, compared with the corrosion-resistant coating formed by the existing parylene monomer, not only the corrosion current density is low, and corrosion potential is high, has good application prospect in electronic product protection or medical instrument protection and the like.

The invention discloses a preparation method of 3, 3, 3-trifluoro-1-propyne, and the preparation method comprises the following steps: S1, in the presence of a solvent, reacting 3, 3, 3-trifluoro-1, 1-dichloro-1-propylene or 3, 3, 3-trifluoro-1, 1-dibromo-1-propylene with a strong base to prepare a 3, 3, 3-trifluoro-1-propyne strong base salt; s2, enabling the 3, 3, 3-trifluoro-1-propyne strong alkali salt to react with water, so as to prepare the 3, 3, 3-trifluoro-1-propyne. The preparation method of the 3, 3, 3-trifluoro-1-propyne, disclosed by the invention, has the advantages of easily available raw materials, simple process, no need of using a catalyst, recyclable solvent, small amount of three wastes, high product yield and suitability for industrial application.

The protein extract composition comprises water, oil seed cake, wherein the weight ratio of water to oil seed cake is 10:1 or less, an alkali salt, and a surfactant, wherein the surfactant is selected from the group consisting of ionic surfactants, nonionic surfactants, and combinations thereof.

The invention provides a method for intensively and synchronously extracting vanadium and chromium from high-chromium vanadium slag, and belongs to the field of metallurgical chemical industry. The preparation method comprises the following steps: by taking diboron trioxide, lanthanum trioxide and cerium dioxide as catalysts and taking high-chromium vanadium slag, sodium nitrate and sodium hydroxide as raw materials, roasting a mixed material by using a microwave muffle furnace to obtain roasted clinker; the roasted clinker is cooled, crushed, screened and leached again, and leaching liquid containing vanadium and chromium and leaching residues are obtained after solid-liquid separation; after the discharged slag is dried, weighing is carried out; and calculating to obtain the leaching rates of vanadium and chromium. According to the invention, the dosage of the catalyst is 0.25%-2% and is far lower than the dosage of 5%-8% of calcium chloride in the prior art, so that the medicament cost is reduced; and the alkali residue ratio can be reduced, the alkali salt consumption can be reduced, and the leaching rates of vanadium and chromium are still stabilized to be 96% or above. The method is focused on synchronous and efficient extraction of vanadium and chromium elements in the high-chromium vanadium slag, and is mainly used for raw material supply in the high-end fields of vanadium redox flow battery positive electrode materials, aerospace high-temperature alloys and the like.

The utility model discloses an embedded combined type high-voltage porcelain insulator, which comprises a porcelain bottle body and a binding post arranged at the upper part of the porcelain bottle body, a mounting base is arranged at the lower part of the porcelain bottle body, the mounting base is made of metal or nonmetal and is embedded on the porcelain bottle body, and the porcelain bottle body is made of an electric porcelain material. According to the utility model, the mounting base is made of metal or non-metal, and the porcelain bottle body is made of an electric porcelain material, so that the porcelain material with excellent insulating property, super-strong overvoltage resistance and natural hydrophobic property is creatively combined with a metal or non-metal structural member; the problems of poor reliability, high failure rate and the like in weather resistance, acid, alkali, salt mist, moist and dust environments of the conventional high-voltage insulators made of resin and DMC (Dimethyl Carbonate) materials are thoroughly solved.

The invention discloses a method for selectively preparing an imidazo [1, 2-a] pyridine derivative by synergistically regulating rhodium catalysis through a solvent and alkali salt, which comprises the following steps: taking 2-aryl imidazo [1, 2-a] pyridine or substituted 2-aryl imidazo [1, 2-a] pyridine and alpha-chloro-aryl ethyl ketone or substituted alpha-chloro-aryl ethyl ketone as initial raw materials; the metal rhodium catalyst is used for catalyzing the carbon-hydrogen bond activation reaction to prepare the imidazo [1, 2-a] pyridine derivative, the reaction condition is mild, the selectivity and yield are high, the safety is high, and industrial production is facilitated; according to the invention, 2-aryl imidazo [1, 2-a] pyridine or substituted 2-aryl imidazo [1, 2-a] pyridine and alpha-chloro-aryl ethyl ketone or substituted alpha-chloro-aryl ethyl ketone are used as initial raw materials for the first time, a reaction is regulated and controlled by simultaneously adjusting a solvent and basic salt, and a formyl methyl imidazo [1, 2-a] pyridine compound or 6-aryl naphtho [1 ', 2': 4, 5-difluoro-2-pyridine-2-one or 6-aryl naphtho [1 ', 2': 4, 5-difluoro-2-pyridine-2-one is prepared from the same initial raw materials. According to the invention, different products of the 5, 5] imidazo [1, 2-a] pyridine compound are synthesized, and the application universality is increased.