181 results about "Acetate salt" patented technology

The invention relates to a method for preparing dimethyl terephthalate by catalyzing waste polyester in one step and dimethyl terephthalate. The invention relates to a method for preparing dimethyl terephthalate by catalyzing waste polyester in one step, which comprises the following steps: mixing a waste polyester material, a catalyst and a depolymerization solution for depolymerization reaction to obtain dimethyl terephthalate, the catalyst is selected from aromatic acid, aromatic acid alkali metal salt, a composition of aromatic acid and carbonate, a composition of aromatic acid and phosphate, a composition of aromatic acid and acetate, a composition of aromatic acid alkali metal salt and carbonate and a composition of aromatic acid alkali metal salt and phosphate; and a composition of aromatic acid alkali metal salt and acetate. The invention also provides the dimethyl terephthalate prepared by the method. The method provided by the invention solves the problems of low product purity and yield in the existing polyester waste chemical recovery method, and also solves the problems of high catalyst cost, harsh reaction conditions and easy secondary pollution to the environment in the existing recovery method.

The invention relates to a method for directionally improving the tolerance of haematococcus pluvialis acetate, aiming at the problem that haematococcus pluvialis is sensitive to high-concentration acetate, the method comprises the following steps: gradually improving the tolerance of algae species through a staged adaptive evolution strategy, gradually adapting WT to 2.5 g / L sodium acetate through short-period-multi-cycle domestication, and obtaining a domesticated algae species HpAC25; on the basis of HpAC25, domesticating the HpAC25 to 5g / L to obtain HpAC50; further, on the basis of HpAC50, domesticating to obtain 7.5 g / L of sodium acetate, so as to obtain HpAC75. In the domestication process, suspended green motile cells are enriched through centrifugation, circulation passage is carried out every 3 days, the cell density is monitored, and the accumulative culture period reaches 189 days. Experiments show that the domesticated algae species HpAC50 and HpAC75 are cultured for 10 days under 5g / L sodium acetate and 7.5 g / L sodium acetate, and the survival rates of the domesticated algae species HpAC50 and HpAC75 reach 81.22% and 43.51% respectively and are increased by 422% and 460% compared with WT. The method is simple and convenient to operate, the tolerance of haematococcus pluvialis to acetate is remarkably enhanced, and a technical basis is provided for efficient production of astaxanthin and large-scale culture.

The invention discloses a scale dissolving agent for rapidly dissolving wet-process phosphoric acid scaling substances as well as a preparation method and application of the scale dissolving agent, and belongs to the technical field of descaling. The scale dissolving agent comprises the following components in percentage by weight: 20-30% of a scale remover, 3-5% of a penetrating agent, 0.3-0.8% of a penetrating aid, 0.5-1% of a surfactant, 0.3-0.5% of a synergist and the balance of water, wherein the descaling agent comprises trisodium citrate dehydrate, sodium ethylene diamine tetracetate and ammonium fluoride; the penetrating agent is prepared from dioctyl sodium sulfosuccinate and perfluoroalkyl ethyl acrylate; the permeation auxiliary agent comprises disodium hydrogen phosphate and sodium carbonate; and the synergist is 1-ethyl-3-methylimidazolium acetate. The scale dissolving agent is specially used for dissolving wet-process phosphoric acid scaling substances and has the advantages of being high in scale dissolving speed, mild in reaction condition, low in formula cost and the like, the pH value of the scale dissolving agent is neutral and slightly alkalescent, and corrosion to production equipment is effectively avoided.

Compositions and methods for providing a person with an exogenous and therapeutically effective supply of short chain fatty acids, chlorogenic acid, and, optionally, ketones are disclosed. The compositions include one or more short chain fatty acids (such as butyric acid, butyrate salts, propionic acid, propionate salts, acetic acid, or acetate salts); chlorogenic acid; and, optionally, one or more beta-hydroxybutyrate salts. The compositions and methods are useful for inducing ketosis and / or beta-oxidative activity in a subject. In addition, compositions that include concentrated forms of, and methods of using, chlorogenic acid (alone or in combination with short chain fatty acids and ketones) to induce ketogenesis in a subject are disclosed.

The invention discloses a lipid nano-micelle preparation method, which comprises: (1) providing an amphiphilic lipid alcoholic solution with a concentration of 20-50 mg / mL and a buffer solution, the buffer solution being selected from a PBS buffer solution, a citrate buffer solution, a Tris-HCl buffer solution or an acetate buffer solution; (2) mixing the alcoholic solution of the amphiphilic lipid and a buffer solution according to the flow velocity ratio of the alcoholic solution of the amphiphilic lipid to the buffer solution of (2-4): 1 by adopting microfluidic mixing equipment to obtain a mixed product; and (3) carrying out liquid change on the mixed product by using a buffer solution to remove the alcohol solvent. On the premise of ensuring the small particle size of the lipid nano-micelle, the uniformity and narrow particle size distribution of the lipid nano-micelle are improved, and the target of batch-to-batch reproducibility is achieved. The method does not need to use dangerous chemicals, is high in safety, is simple to operate, is low in amplification production difficulty by combining a microfluidic technology with a liquid change technology, is low in energy consumption, can effectively improve the production efficiency, and reduces the production cost.

This invention discloses a method for synthesizing acetate-promoted amidine cobalt complexes. Specifically, when an N,N'-dialkyl-substituted amidine alkali metal salt reacts with a cobalt precursor, acetate is added as a promoter. The chelating effect of acetate regulates the reaction activity and selectivity, enabling the efficient preparation of amidine cobalt compounds. The reaction yield can reach up to 95%, with a product purity >98%. This invention features readily available raw materials, simple operation, mild reaction conditions, good selectivity for the target product, high synthesis efficiency, and convenient post-processing, making it promising for industrial applications.

The present invention belongs to the technical field of comprehensive utilization of waste resources. In order to solve the problem that the flue gas fraction generated by high-temperature calcination in the current preparation process of ceramic abrasive materials cannot be utilized, a deicing agent and a preparation method thereof are provided. The deicing agent comprises the following raw materials in parts by weight: 10 parts of chloride salt, 0.5-2 parts of acetate, 0-4 parts of anti-slip material, 0.02-2 parts of additives, and 5-20 parts of flue gas powder; the chloride salt is a chloride salt containing crystal water or a chloride salt without crystal water. It has a wide temperature application range of 0-40°C and is environmentally friendly and pollution-free. It is widely used in airports, highways, railways, and places where snow melting and ice de-icing are required; under the same conditions, the use of deicing agent is reduced by more than 5%, the melting rate is increased by more than 20%, the degree of metal corrosion is reduced by more than 15%, and the degree of cement concrete corrosion is reduced by more than 13%.

The utility model discloses a cyanide-free imitation gold plating layer structure of an aluminum alloy part, which comprises an aluminum alloy substrate, and a chemical zinc deposition layer, a citrate pre-nickel plating layer, a nickel-copper alloy plating layer, a bright nickel plating layer, a cyanide-free imitation gold plating layer and an electrophoretic varnish coating which are sequentially prepared on the aluminum alloy substrate from inside to outside. According to the cyanide-free gold-imitating plating layer structure of the aluminum alloy part disclosed by the utility model, the binding force of the plating layer is tested by a thermal shock method according to the GB / T 5270-2005'metal covering layer electro-deposition and chemical deposition layer adhesion strength test method on a metal matrix ', the binding force meets the standard requirement, an acetate fog test is carried out for 168 hours according to the GB / T 10125-2021'artificial atmosphere corrosion test and salt spray test', and the binding force meets the standard requirement. And no red corrosives are generated on the surface of a plated part, and the plating layer structure has good corrosion resistance.

The invention relates to a metal hydroxide for a heat storage system and a green preparation method and application thereof. The green preparation method of the metal hydroxide, provided by the invention, comprises the following steps: dissolving metal acetate in water, and preparing a metal acetate aqueous solution with the metal ion concentration of 0.01-1mol / L; placing the metal acetate aqueous solution in an open container, and carrying out evaporation concentration treatment at 30-95 DEG C for 1-96 hours to generate a metal hydroxide precipitate; and carrying out solid-liquid separation on the metal hydroxide precipitate, washing and drying to obtain the metal hydroxide. The method does not need to add an alkaline agent or an organic auxiliary agent, avoids generation of by-products of salts and high-salt waste liquid, and accords with 12 principles of green chemistry; reaction conditions are mild, the process is simple, operation can be carried out at normal temperature and normal pressure, energy consumption is low, and safety is high; the raw material conversion rate is high, mother liquor can be recycled, and high-atom-economy and low-cost production is achieved.

The application discloses a plant genome DNA extraction reagent, which comprises Buffer 1 lysate, Buffer 2 precipitate and Buffer 3 combination liquid; the Buffer 1 lysate comprises sodium chloride, PVP40, sodium metabisulfite and SDS; wherein the concentration of the sodium chloride is 250-1200 mM; the mass percentage of the PVP40 is 0.5%-3%; the concentration of the sodium metabisulfite is 50-150 mM; and the mass percentage of the SDS is 0.7%-2.5%; the Buffer 2 precipitate comprises acetate; wherein the concentration of the acetate is 2.2-4.3 M; and the Buffer 3 combination liquid comprises guanidine hydrochloride; wherein the concentration of the guanidine hydrochloride is 0.5-2.5 M. The extraction reagent does not contain organic solvents such as phenol and chloroform, and can improve the removal rate of polyphenols.

The invention provides an iron-substituted silicon-tungsten heteropolyacid salt electrolyte for a high-capacity flow battery, which takes water as a solvent and comprises an active substance and a supporting electrolyte, the active substance is iron-substituted silicotungstic heteropolyacid salt, the molecular formula of the iron-substituted silicotungstic heteropolyacid salt is K4SiW11O39FeIII.x (H2O), and the iron-substituted silicotungstic heteropolyacid salt is formed by partially substituting tungsten atoms in a Keggin type silicotungstic acid framework by iron atoms; the supporting electrolyte is at least one of acetate, chlorate or sulfate, and the concentration of the supporting electrolyte is 0.1-2M. The electrolyte can be used as a positive electrode and / or negative electrode electrolyte of a flow battery, has the characteristics of high solubility, high stability and high energy density, and effectively solves the problem of low energy density of a traditional flow battery.

The purpose of the present disclosure is to provide a protective agent excellent in a protective effect of a phospholipid membrane. This liquid composition for protecting a phospholipid membrane comprises (A) a magnesium salt, (B) an acetate buffer solution, a citrate buffer solution, a carbonate buffer solution, and / or a succinate buffer solution, and preferably further contains at least any of (C) a polyhydric alcohol, (D) a saccharide and / or a sugar alcohol, (E) polyethylene glycol, and (F) an amino acid. The liquid composition for protecting the phospholipid membrane is excellent in the protective effect of the phospholipid membrane.

The invention relates to a hydroxyl functional ionic liquid electrolyte as well as a preparation method and application thereof. The hydroxyl functional ionic liquid electrolyte comprises a lithium salt and a 1-(2-hydroxyethyl)-3-methylimidazole acetate ionic liquid. According to the hydroxyl functional ionic liquid electrolyte, the 1-(2-hydroxyethyl)-3-methylimidazole acetate ionic liquid is used for replacing an organic solvent, so that the hydroxyl functional ionic liquid electrolyte has better thermal stability and chemical stability, and thermal runaway, combustion even explosion, internal short circuit and battery breakage of a lithium battery under severe conditions of high temperature, high pressure and the like can be avoided.

The application relates to application of iron-nitrogen doped graphene in preparation of anti-radioactive enteritis drugs and belongs to the technical field of biological medicines. ZIF-8 powder, 1,10-phenanthroline powder, iron (II) acetate powder and a grinding medium are placed in a closed container to perform mechanical ball milling treatment to obtain a mixed powder; under the protection of inert gas, the mixed powder is placed in a preheated tube furnace to perform pyrolysis treatment, and is cooled to room temperature to obtain iron-nitrogen doped graphene. The iron-nitrogen doped graphene has NADH oxidase-like activity, can directly catalyze the conversion of NADH into NAD + , can rapidly supplement NAD + depletion caused by radiation, can enhance PARP-dependent DNA damage repair, can reduce the generation of active oxygen (ROS), can reduce intestinal cell death and can protect the integrity of intestinal structure, and can realize efficient protection of radioactive enteritis. Moreover, the problem of low-efficiency biosynthesis of NAD + supplementation in existing radioactive intestinal injury protection technologies is solved.

The invention relates to a preparation method of a perovskite solar cell, in particular to a preparation method of a 1-ethyl-3-methylimidazole acetate modified perovskite cell. The method comprises the following steps: 1, pretreating conductive glass; 2, preparing a hole transport layer; (3) preparing a 1-ethyl-3-methylimidazole acetate modified perovskite precursor solution; 4, depositing and crystallizing a modified perovskite absorption layer; 5, preparing an electron transport layer; and 6, coating a metal electrode. According to the method, the 1-ethyl-3-methylimidazole acetate ionic liquid additive is introduced into the perovskite precursor solution, so that the crystallization kinetics and morphology of the perovskite thin film are effectively regulated and controlled, the grain boundary and surface defect state density is remarkably reduced, non-radiative recombination is inhibited, and the stability of a perovskite phase is enhanced. According to the modification method, the photoelectric conversion efficiency and the long-term working stability of the perovskite solar cell are remarkably improved. Meanwhile, the adopted 1-ethyl-3-methylimidazole acetate additive is relatively wide in source, small in dosage, good in process compatibility and simple to operate, so that the method is suitable for being applied to preparation of the absorption layer of the perovskite solar cell and has commercial potential.

The invention belongs to the field of metal-organic framework (MOF) material synthesis, and discloses a method for preparing a UTSA-16 material through two-step ball milling and a product. The method comprises the following steps: putting citric acid and potassium hydroxide into a ball mill for ball milling; adding metal acetate into the ball mill, mixing the metal acetate with the obtained product, carrying out ball milling again, and then washing and drying the obtained product to obtain a UTSA-16 material; the metal acetate is zinc acetate or a combination of zinc acetate and one of cobalt acetate, magnesium acetate and copper acetate. According to the efficient and green method for preparing the high-quality UTSA-16 material, citric acid and potassium hydroxide are subjected to ball milling to prepare potassium citrate, then mechanical energy generated by ball milling is utilized again to promote the potassium citrate and metal acetate to be subjected to a coordination reaction, the ion concentration in the raw materials in the reaction process is higher, and the yield is higher. The method has the advantages of high synthesis efficiency, high yield and the like, and the preparation process has the advantages of mild reaction conditions, low energy consumption, greenness, high efficiency and the like.

The invention discloses an acetate-resistant domesticated algal strain HpAc50 and an application thereof. The algal strain is preserved in the China Center for Type Culture Collection on January 12, 2026, and the preservation number is CCTCC M 202690. The haematococcus pluvialis strain is obtained by carrying out acetate-resistant domestication on haematococcus pluvialis and can be cultured under the condition that the acetic acid concentration is 0-10g / L, and the yield of astaxanthin is effectively increased. The invention specifically provides three application conditions: illumination of 0-5000lux and a full-nutrient culture medium; illumination is performed at 0-5000 lux, a nitrogen-phosphorus-deficient culture medium is adopted, and an exogenous stimulant is added According to the present invention, with the application of the strain, the cell density, the biomass and the astaxanthin accumulation can be significantly improved under the conditions of illumination of 5000-15000 lux and nitrogen and phosphorus deficiency culture medium, such that the strain has strong acetate tolerance and strong production performance compared with the wild type strain, and is suitable for the large-scale astaxanthin production.

This invention relates to the field of chemical synthesis technology, providing a metal-modified lignin-based functional carbon, its preparation method, and its application. The preparation method includes: treating lignin using a chemical oxidation method to obtain lignin-based functional carbon; mechanically ball-milling the lignin-based functional carbon and metal acetate, washing the resulting material with ultrapure water, and vacuum drying to obtain the metal-modified lignin-based functional carbon material, which is then used to catalyze the isomerization of glucose to fructose. This invention uses lignin as a raw material to achieve the resource-based reuse of biomass; the method for obtaining the metal-modified highly active lignin-based functional carbon material is convenient, green, and safe; the metal-modified highly active lignin-based functional carbon material can not only efficiently convert glucose isomerization to fructose, but also has a short reaction time and high selectivity; the metal aluminum-modified lignin-based functional carbon catalyst obtained by this invention achieves a glucose conversion rate of 80%-100% and a fructose yield of 55%-60%.

The application discloses a synthesis method of a lithium nickel manganese oxide positive electrode material and relates to the technical field of lithium ion battery materials, aiming at solving the problems of complex post-treatment after using nitrate raw materials, poor product morphology after spraying acetate raw materials and influence on performance; the method comprises the following steps: dissolving nickel acetate, manganese acetate and ammonium nitrate in deionized water to obtain a mixed solution; the mixed solution is spray dried to prepare mixed acetate of nickel and manganese; the mixed acetate is heat-treated in an oxygen atmosphere to obtain a nickel manganese oxide precursor; the nickel manganese oxide precursor is mixed with a lithium salt and then heat-treated in an oxygen atmosphere to obtain the lithium nickel manganese oxide positive electrode material; the spray drying method is adopted to prepare the precursor, thus avoiding the disadvantages of uneven precipitation and complex post-treatment of the reaction solution in the coprecipitation method, and the acetate is adopted to replace the nitrate, thus avoiding the complex post-treatment; in addition, the added ammonium nitrate can solve the problem of poor product morphology caused by the acetate raw material.

The invention provides a palladium-based catalyst as well as a preparation method and application thereof. The palladium-based catalyst comprises a carrier and active components loaded on the carrier, the active components comprise metal Pd, metal Au and alkali metal acetate, the metal Pd contains Pd nano-particles with the average diameter being smaller than 5 nm, and the Pd nano-particles with the average diameter being smaller than 5 nm account for 1%-20% of the total weight of the metal Pd. The method for preparing the palladium-based catalyst comprises the following steps: (1) dipping a carrier loaded with metal Pd (0) and metal Au (0) in a nano-palladium dispersion liquid to obtain a catalyst precursor IV; and (2) dipping the catalyst precursor IV in a solution containing alkali metal acetate to obtain the palladium-based catalyst. The palladium-based catalyst provided by the invention has excellent catalytic activity and selectivity in a vinyl acetate preparation reaction.

The application discloses a kind of metal halide perovskite nanocrystals resistant to heat-induced fluorescence quenching and preparation method and application thereof.The preparation method comprises the following steps: formamidine source, cesium source, guanidine source are dissolved in liquid organic acid, then mixed to obtain precursor solution A;Organic small molecule amine or organic small molecule amine acetate or organic small molecule amine carbonate is dissolved in liquid organic acid to obtain organic small molecule amine solution;Organic small molecule amine solution is mixed with precursor solution A to obtain precursor solution B;At room temperature, in air atmosphere, precursor solution B, lead precursor solution are mixed and stirred, then organic ammonium halide solution is added, continue to stir to obtain perovskite nanocrystal crude solution;Separation and purification are carried out to obtain perovskite nanocrystals.The application solves the problem of heat-induced fluorescence quenching of metal halide perovskite material, and at the same time ensures its charge transport performance, so that the material is suitable for preparing active layer of electroluminescent or photoluminescent LED.

The invention relates to the field of cellulose organic modification, in particular to a quaternary ammonium salt modified cellulose cationic conditioner as well as a preparation method and application thereof. The quaternary ammonium salt modified cellulose cationic conditioner is prepared from a cellulose matrix, an etherifying agent, a complexing antibacterial agent, a cross-linking agent, a pH value regulator and a solvent. The cellulose matrix is at least one of microcrystalline cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), hydroxy propyl cellulose (HPC) and carboxymethyl cellulose (CMC); the complexing antibacterial agent comprises at least one of water-soluble copper salt and water-soluble zinc salt; the solvent is formed by compounding deionized water and an aprotic solvent; the pH value regulator is at least one of acetic acid, hydrochloric acid and sodium hydroxide. The quaternary ammonium salt modified cellulose cationic conditioner prepared in the invention shows an excellent bactericidal effect at low concentration, and overcomes the problem of poor bactericidal effect at low concentration of traditional cationic cellulose.

Provided is a method for producing a catalyst capable of producing vinyl acetate at a particularly high selectivity while ensuring high catalytic activity. One method is a method for producing a catalyst for producing vinyl acetate, which comprises a carrier, copper, palladium, gold, and an acetate salt, and the method comprises the following steps in order: Step 1, a step of impregnating the carrier with an alkali solution; Step 2, a step of bringing the carrier into contact with a solution containing a compound containing copper, a compound containing palladium, and a compound containing gold; Step 3, a step of performing a reduction treatment; and Step 4, a step of supporting the carrier with an acetate salt.

An organic molecular mimetic enzyme capable of catalyzing the oxidation of TMB by H2O2, wherein the organic molecular mimetic enzyme is PQQ. The organic molecular mimetic enzyme is used to catalyze a color change reaction caused by the oxidation of TMB by H2O2. The organic molecular mimetic enzyme is used to detect alkaline phosphatase by catalyzing a color change reaction caused by the oxidation of TMB by H2O2. The detection steps for alkaline phosphatase by catalyzing a color change reaction caused by the oxidation of TMB by H2O2 are as follows: PQQ, TMB, H2O2, and acetate buffer solution are uniformly mixed and incubated for 30 minutes; alkaline phosphatase ALP and phosphorylated ascorbic acid AAP are uniformly mixed and incubated for 30 minutes. Finally, the two solutions are mixed and the color change of the solution is observed visually or the absorbance of the solution at 650 nm is measured using a spectrophotometer. The present invention has the advantages of being simple, rapid, and requiring no special equipment.

The application provides a production technology of ultra-high specific surface area high-dispersibility silicon dioxide for special tires, and belongs to the technical field of silicon dioxide production; the production method comprises the steps of liquid water glass pretreatment, initial mixing, first-time acid adding, simultaneous acid and alkali adding, and second-time acid adding; the liquid water glass pretreatment step is as follows: liquid water glass is added into deionized water, uniformly stirred, then amino-trimethylene phosphonic acid solution is added, stirring is carried out at 40-50 DEG C for 25-40 min, after the stirring is completed, 1-ethyl-3-methyl imidazole acetate is added, heat preservation stirring is carried out for 18-25 min, then microwave treatment is carried out, and pretreated liquid water glass is obtained; the prepared silicon dioxide has good dispersibility and high specific surface area, and can effectively improve the strength performance and stability of the special tire when used in the special tire.

The present disclosure is directed to an electrodepositable coating composition comprising a cationic salt group-containing film-forming polymer comprising active hydrogen functional groups; a blocked polyisocyanate curing agent; a guanidine curing catalyst; and an acid scavenger, metal oxide, and / or metal acetate. Also disclosed are pigment pastes, methods for coating substrates, and coated substrates.

The invention relates to the technical field of fuel cell cathode catalysts, and discloses a proton exchange membrane fuel cell cathode catalyst and a preparation method and application thereof.The preparation method comprises the steps that 1, tetraammineplatinum acetate, M metal acetate, citric acid and a solvent are mixed under the stirring condition and subjected to a coordination reaction, and a coordination solution is obtained; a coordination reaction product containing the coordination compound is obtained; wherein M is selected from at least one of Ni, Co and Zn; (2) performing high-temperature pyrolysis on the coordination reaction product in an inert atmosphere; and (3) contacting the product obtained in the step (2) with acid, and then carrying out solid-liquid separation, washing and drying to obtain the carbon-coated platinum-based alloy nano material, and (4) mixing the carbon-coated platinum-based alloy nano material with conductive carbon black. The proton exchange membrane fuel cell cathode catalyst prepared by the invention has excellent sulfur poisoning resistance and good stability.

The invention discloses a preparation method of a concrete crystal nucleus early strength agent and the prepared concrete crystal nucleus early strength agent. The preparation method of the concrete crystal nucleus early strength agent comprises the following steps: (1) adding sodium acetate and calcium acetate into water to form an acetate solution, wherein the temperature of the solution is not lower than 90 DEG C; (2) dissolving sodium metasilicate nonahydrate in water, and heating to not lower than 90 DEG C to form a sodium silicate solution; (3) heating the hot melt adhesive to be not lower than 90 DEG C and completely melting to obtain hot melt adhesive slurry; (4) stirring the hot melt adhesive slurry, slowly dropwise adding an acetate solution and a sodium silicate solution at a constant speed, and synchronously performing ultrasonic dispersion to obtain a mixed emulsion; and (5) spraying the mixed emulsion into the air through atomization equipment, and continuously blowing the mixed emulsion with warm air so that the mixed emulsion floats in the air and naturally falls to form the concrete crystal nucleus early strength agent. The crystal nucleus early strength agent prepared by the method can effectively improve the early strength of concrete, reduce the volume shrinkage of the concrete and improve the construction efficiency in winter.

The utility model discloses a nickel-free gold-substituted plating layer structure with polythiocyanate pre-plated copper, which comprises a steel substrate, and a polythiocyanate pre-plated copper layer, an acid copper plating layer, a cupronickel tin plating layer, a gold-substituted plating layer and a nano polymer protective film which are sequentially prepared on the steel substrate from inside to outside. According to the nickel-free gold-substituted plating layer structure for pre-plating copper with polythiocyanate, the binding force of the plating layer is tested by a thermal shock method according to GB / T 5270-2005 Electrodeposition and Chemical Deposition Layer Adhesive Strength Test Method for Metal Cover Layer on Metal Matrix, the plating layer does not blister or fall off, the binding force meets the standard requirement, and the plating layer can be used as a plating layer for plating copper with polythiocyanate, so that the nickel-free gold-substituted plating layer structure for pre-plating copper with polythiocyanate can be used as a plating layer for plating copper. According to an acetate fog test carried out for 72 hours according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, no corrosives are generated on the surface of a plated part, and a plated layer has good corrosion resistance.

The invention relates to the technical field of asphalt-based carbon material preparation, and discloses an asphalt-based hard carbon material based on an ion exchange method and a preparation method thereof.The preparation method comprises the following steps that raw material asphalt is smashed, placed in concentrated nitric acid for a heating oxidation reaction, cooled, filtered and dried, and oxidized asphalt is obtained; carrying out ion exchange reaction on the oxidized asphalt and an acetate solution under an alkaline condition, filtering, separating and drying a solid product after the reaction is finished; carrying out carbonization treatment on the solid product in a nitrogen atmosphere; and after carbonization treatment, rapidly cooling to room temperature, pickling, washing to be neutral, filtering, separating and drying to obtain the hard carbon material.