140results about How to "Weak corrosive" patented technology

The invention discloses a road dust suppressant, and preparation and construction methods thereof, and belongs to the field of environmental protection and dust suppression. The road dust suppressant consists of the following components in percentage by weight: 0.1-2 percent of dispersible emulsion powder, 0.1-10 percent of an emulsion, 0.2-5 percent of a hygroscopic moisturizer, 0.01-0.5 percent of an absorbent, 2-10 percent of an anti-freezing agent, 0.1-0.2 percent of a wetting agent, 1-25 percent of filler and the balance of water. The road dust suppressant, and preparation and construction methods thereof disclosed by the invention have the benefits that inhalable particulate matters, nitric oxide, sulfide and other harmful matters on roads can be effectively reduced; the road dust suppressant has the characteristics that the environment is friendly, the hygroscopicity and the moisture retention are strong, the corrosion to vehicles and the roads is weak, and the road potential safety hazards cannot be caused.

The invention discloses mildew-proof and anti-bacterium liquid crystal electronic glass partition paper and a production technology thereof. Pulp of the partition paper comprises 50% to 70% of original coniferous wood pulp, 10% to 30% of original hardwood pulp and 10% to 20% of coniferous wood chemithermomechanical pulp, wherein the coniferous wood pulp and the coniferous wood chemithermomechanical pulp are pulped in a mixed mode, and the beating degree is 25 degreeSR to 30 degreeSR; the hardwood pulp is independently pulped, the beating degree is 20 degreeSR to 25 degreeSR, the fixed quantity is 30 g / m<2> to 60 g / m<2>, the pH value is 4.5 to 6.5, the moisture content is 1.0% to 4.0%, the surface resistance is larger than or equal to 1,010 omega, and air permeability is larger than or equal to 500 ml / min. The faintly-acid mildew-proof and anti-bacterium liquid crystal electronic glass partition and packaging paper high in stiffness, mechanical strength and air permeability is prepared in combination with various measures, and the paper has the certain separation and protection effects in the storage process and the transportation process of electronic glass, and meanwhile has the mildew-proof function and the moistureproof function.

The invention discloses water-based zinc ion battery colloidal electrolyte, and a preparation method and an application thereof. The colloidal electrolyte material is formed by adding a clay materialto liquid electrolyte and uniformly mixing the same. The preparation method comprises the following steps: adding the clay material to conventional liquid electrolyte, thoroughly mixing the same understirring, and performing ageing to obtain uniform and stable colloidal electrolyte. The colloidal electrolyte prepared by the preparation method disclosed by the invention has higher ionic conductivity than liquid electrolyte, a colloidal zinc ion battery has excellent performance, good safety, stable performance and higher specific capacity, maintains excellent cycle stability and shelving performance or the like at high and low current densities, and meets the requirements of the water-based zinc ion energy storage technology with high energy density and long life, thereby having a broad application development space.

The invention relates to a silicon wafer degumming agent, which comprises, by weight, 20-60% of an organic acid, 0.5-5% of a surfactant, 5-40% of an organic solvent, 15-75% of water, 0-2% of a corrosion inhibitor, and 0-2% of an antifoaming agent. The present invention provides the silicon wafer degumming agent with characteristics of rapid degumming, no irritating odor, low cost, weak corrosion, effective reduction of wafer and edge breaking rate, and provision of excellent pre-washing effect for the next washing step so as to solve defects of poor degumming effect, high degumming cost, and strong corrosion of the existing degumming agent.

The invention discloses a photoresist detergent composition, which comprises quaternary ammonium hydroxides, water, aromatic alcohol, dimethyl sulfoxide, and at least one corrosion inhibitor selecting from citric acid, tricaprylyl citrate and citrate. The photoresist detergent composition can also comprise a polar organic cosolvent, a surface active agent and / or other corrosion inhibitors. The photoresist detergent composition can remove the photoresist (particuarly thick film negative photoresist) with the thickness of over 20 mu m on the metals, metal alloys or dielectric medium substrates, and other etching residues; and meanwhile, the composition has low causticity to the metals such as aluminum, copper and the like and the nonmetallic materials such as silicon dioxide and the like, thus, the composition has good application prospect in the micro-electronics fields such as semiconductor chip cleaning, and the like.

The invention discloses titanium and titanium alloy electrochemical polishing liquid and a polishing method. The electrochemical polishing liquid comprises the following components: 10-40 g / L of sodium chloride, 40-70% of glycerin, 20-40% of glycol, 5-20% of anhydrous ethanol, 0.1-1% of perchloric acid, and 1-5 g / L of additive; and the additive consists of an accelerator, a leveling agent and a brightening agent. Substances contained in the electrochemical polishing liquid are environment-friendly and nontoxic; no poisonous gas is generated in the electrochemical polishing process; after titanium and titanium alloy workpieces are electrochemically polished by the electrochemical polishing liquid, the surfaces present specular gloss, and the average roughness can be reduced below 10 nm; the electrochemical polishing liquid is weak in corrosion capacity and low in corrosion of electrolysis equipment, and can be used for a long time; only mother liquor needs to be fed in the electrochemical polishing liquid; and the electrochemical polishing liquid can be reused by above 500 times, and is high in stability.

The invention discloses a scaling powder for a nickel-plating alloy soft soldering tin wire core and the preparation method of the scaling powder. The weight formula of the scaling powder comprises the following components by weight percent: 60-90% of resin, 0.1-20% of organic acid, 0.1-10% of organic amine, 0.1-20% of metal salt, 0.1-2.0% of active strengthening agent, 0.1-2.0% of surfactant, 0.1-1.0% of corrosion inhibitor and 0.1-1.0% of antioxidant. The scaling powder disclosed by the invention is suitable for producing lead-containing or non-lead solder tin wire containing scaling powder and can be used for automatically welding or manually welding nickel-plate alloy; and when in use, the welding time of the tin wire is short, the wettability is good and the welding residues are few, so that the scaling powder belongs to environment-friendly scaling powder, and the tensile strength of the welding point joint is high and the insulating resistance is large. The tin wire prepared by the invention is very suitable for soft soldering of nickel-plate alloy and is suitable for soft soldering of chromium plating, gold plating, copper and copper alloy.

The invention relates to a technique of synthesizing paraaminophenol by catalyzing and dydrogenating nitrobenzene, and belongs to the technical field of aminophenol. The invention is the technique of producing the paraaminophenol from the nitrobenzene catalyzing dydrogenating device in the metal salt liquors, wherein, the quality compounding rate of the material has a mass distribution ratio that Lewis acid metal salt: load metal Pt activator: nitrobenzene: hexadecyl trimethyl ammonium bromide: water is equal to 0.5 to 5 : 0.1 to 0.3 : 1 to 5 : 0.01 : 50. The invention has the reacting conditions that: a branch pressure of the hydrogen is 0.1 to 1.0 M Pa, a reacting temperature is 80 to 200 DEG C, and a reacting time is 1 to 10 hours. The reaction which is proceed in the neutral or acidulous metal salt liquors has not high requirements to the device material, thereby preventing using abundant ammonia during the managing process, simplifying the production craftworks and overcoming the problems of the canker of the device and the serious environmental pollution; the metal salt and the activators can be separated from the reaction system for being reused repeatedly; therefore, the invention reduces the production cost, also prevents the discharging of the waste liquids and makes the yield of PAP highly reach to 25 to 73 percents.

The invention discloses a phase change heat storage material as well as a preparation method and application thereof and a phase change heat storage device. The phase change heat storage material comprises the following raw materials in parts by mass: 60-75 parts of hydrous salt, 0.5-3 parts of nucleating agents, 1-3 parts of anti-supercooling agent, 1-3 parts of phase splitting preventing agent, 1-5 parts of heat conducting reinforcing materials and 1-5 parts of rare earth compound. The preparation method is characterized by mixing various raw materials, melting, uniformly mixing and cooling the mixture and then grinding the mixture into powder, thus obtaining the phase change heat storage material. The phase change heat storage material is applied to a heat collector. The phase change heat storage device comprises a shell and the phase change heat storage material arranged in the shell. The phase change heat storage material has the beneficial effects that the phase change heat storage material has higher phase change latent heat, low toxicity and weak corrosivity; the phase change heat storage material is encapsulated in the shell and then the shell is placed in the heat collector, thus avoiding the problem of corrosion or scaling caused because the phase change heat storage material comes into direct contact with the wall of the heat collector; the phase change heat storage material has a better application prospect in the field of solar power generation.

The invention discloses a photoresist detergent composition, which comprises quaternary ammonium hydroxides, water, alkyl glycol ether with 3 to 18 alkyl glycol carbon atoms, dimethyl sulfoxide, and at least one corrosion inhibitor selecting from citric acid, tricaprylyl citrate and citrate. The photoresist detergent composition can also comprise a polar organic cosolvent, a surface active agent and / or other corrosion inhibitors. The photoresist detergent composition can remove the photoresist (particularly thick film negative photoresist) with the thickness of over 20 mu m on the metals, metal alloys or dielectric medium substrates, and other etching residues; and meanwhile, the composition has low causticity to the metals such as aluminum, copper and the like and the nonmetallic materials such as silicon dioxide and the like, thus, the composition has good application prospect in the micro-electronics fields such as semiconductor chip cleaning, and the like.

The present invention relates to method of preparing mineral bonding material and its composite materials with phosphate and aluminum-silicon material at relatively low temperature. Under relatively low temperature, aluminum-silicon material with reaction activity is made to produce bonding reaction with phosphate to obtain one kind of amorphous solid Al-Si-P mineral bonding material. The Al-Si-P mineral bonding material may be used as basic material to prepare various composite materials with different performance via adding bauxite, silicon powder, flyash, mineral slag, fiber, etc. The said composite materials may be formed through casting or pressing, and the materials have excellent endurance, high mechanical strength and good high temperature performance.

The invention discloses a method for preparing a leather fat-liquoring agent. The method employs sulfamic acid as a sulfatizing reagent, and employs one or more of sulfuric acid, phosphoric acid, hypophosphorous acid, urea, amine oxide and thiourea as a catalyst. Grease and the sulfamic acid are subjected to a sulfation reaction and then an alkali solution is added in for a neutralization reaction to get the leather fat-liquoring agent. By using the sulfamic acid as the sulfating reagent, corrosion to equipment and harm to the environment can be reduced because the sulfamic acid has characteristics of non-volatilization, no stink, few human toxicity and weak corrosivity. Occurrence of side reaction during the sulfation reaction can be effectively inhibited by using the catalyst. Moreover, according to the invention, the sulfation reaction can be realized without excessive sulfamic acid, so that salt wash is not needed after the leather fat-liquoring agent is obtained, thereby preventing discharge of acidic waste brine and environment pollution. Experiment results show that the leather fat-liquoring agent has good emulsifying property and can impart good softness and fullness to the leather.

The invention discloses a detergent composition for photoresists. The detergent composition for the photoresists comprises quaternary ammonium hydroxide, aryl alcohol, dimethyl sulfoxide, corrosion inhibitor and water, wherein the corrosion inhibitor contains one or more of boric acid, borate and boric acid ester. The detergent for the photoresists can remove the photoresists (particularly thick-film negative photoresists) with the thickness of more than 20 mu m and other etching residues on base materials such as metals, metal alloys, dielectrics and the like, and has lower corrosivity to metals such as aluminum, copper and the like and nonmetallic materials such as silicon dioxide and the like, so that the detergent composition for the photoresists has good application prospect in the fields of cleaning microelectronics such as semiconductor chips and the like.

The invention discloses a compound type foam dedusting agent. The compound foam dedusting agent comprises, by weight, 0.2%-0.3% of alpha olefins, 0.3%-0.5% of alpha-olefin sulfonate, 0.01%-0.03% of lauryl sodium sulfate, 0.03%-0.05% of sodium dodecyl benzene sulfonate, 0.3%-0.4% of trimethyl-1-propanaminium iodide, 0.02%-0.04% of cocoamido propyl hydroxy sulfoBetaine, 0.01%-0.02% of dodecyl dihydroxyethyl amine oxide, 0.01%-0.03% of modified polyethoxylated silicone, 0.02%-0.03% of polyoxyethylene fatty acid, 0.1%-0.2% of pentaerythritol oleate and balance water. Due to the fact that the pentaerythritol oleate was regarded as the corrosion inhibitor and added into the foam dedusting agent, the corrosivity on electromechanical equipment is greatly lowered, and the working environment of the workplace with the high concentration of dust is effectively improved.

The invention provides a preparation method and an application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization. The preparation method comprises the following steps: 1, crushing a biomass raw material rice straw, screening, and drying in a 105 DEG C blast drying oven for 12 hours; 2, carrying out hydrothermal treatment on the crushed rice straw, naturally cooling to room temperature after the reaction is finished, carrying out suction filtration, washing with absolute ethyl alcohol and ultrapure water to remove impurities, and drying to obtain brownish black straw hydrothermal carbon; 3, mixing the straw hydrothermal carbon, an activating agent and melamine according to a certain mass ratio, and fully grinding in a mortar; and 4, putting the ground mixtureinto a tubular furnace, carrying out high-temperature activation in an inert gas atmosphere, naturally cooling to room temperature, and carrying out acid washing, water washing and drying on the obtained material to obtain the nitrogen-doped straw hydrothermal carbon-based porous carbon for the supercapacitor. The method comprises the following steps: A, a working electrode preparation method; andB, a supercapacitor preparation method.

The invention relates to a compound acidity regulator for a silage and a use method thereof. The compound acidity regulator is characterized by comprising the following components in percentage by weight: 50-65% of propionic acid, 5-10% of formic acid, 20-30% of sodium benzoate and 0-25% of water. The compound acidity regulator is used for acidity regulation of various silages, and the adding quantity of the compound acidity regulator in the silage is 2-5L / ton. According to the compound acidity regulator for the silage and the use method of the compound acidity regulator, the acidification process of the silage is accelerated, the period of the silage is shortened, the undesirable fermenting and secondary fermenting problems after cellar silage opening are prevented, nutrient substances of the silage are maintained to a maximal degree, the digestibility is improved, and the quality of the silage is improved, so that the improvement of milk yield of milk cows is accelerated and the fattening performances of beef cattle and mutton sheep are enhanced.

The invention belongs to the field of deicing and snow-melting agents, and discloses a biomass environment-friendly non-chlorine deicing and snow-melting agent and a preparation method thereof. The deicing and snow-melting agent is prepared from 10-30 parts of tap water, 15-35 parts of glucose degradation product, 6-20 parts of starch degradation product, 8-18 parts of saccharose, 7-18 parts of monoglyceride citrate and 2-5 parts of corrosion inhibitor; the preparation method comprises the steps that firstly, the glucose degradation product and the starch degradation product are prepared; thenthe tap water is added into a reaction kettle, the temperature rises to 60-80 DEG C, the glucose degradation product and the starch degradation product are added, and mixing reaction is carried out for 1-3 h; then the saccharose, the monoglyceride citrate and triisopropanolamine are added in sequence, and full stirring and mixing reaction is carried out for 1-2 h; and lastly, after the reactant is mixed uniformly and dissolved into one phase, cooling and discharging are carried out. The biomass environment-friendly non-chlorine deicing and snow-melting agent and the preparation method thereofhave the advantages that the obtained product has strong snow-melting and deicing abilities and a weak corrosive effect, the raw material is basically biomass, the biodegradability is high, and the biomass environment-friendly non-chlorine deicing and snow-melting agent belongs to an environment-friendly product.

The invention provides a method for synthesizing dinitrile ethyl tertiary amine from aliphatic primary amine by a one-step method, which comprises the steps of adding aliphatic primary amine into acrylonitrile by using a glycollic acid aqueous solution as a catalyst, synthesizing a dinitrile ethyl tertiary amine compound by a one-step method under heating reflux, and after the reaction is finished, carrying out reduced pressure distillation treatment to remove low-boiling-point components, and obtaining the dinitrile ethyl tertiary amine compound with the yield being higher than 95%. The process provided by the invention has the following advantages: 1) single nitrile ethylation reaction and double nitrile ethylation reaction are carried out at the same time, so that the reaction efficiency is improved; 2) the glycollic acid is weak in acidity and basically has no corrosion to reaction equipment, so that the equipment investment is reduced; and 3) the reaction mother liquor does not need to be neutralized by adding alkali, so that a large amount of salt-containing wastewater is avoided, and the post-treatment process is simplified.

The invention discloses a photoresist cleaning agent containing quaternary ammonium hydroxide, water, alkyl diol ether, dimethyl sulfoxide and polyacrylic inhibiter, wherein the number of carbon atomof alkyl diol in the alkyl diol ether is 3-18. The photoresist cleaning agent can remove photoresist (in particular to thick-film negative photoresist) on base materials such as metal, metal alloy ordielectric and the like and other corrosion residues, has extremely weak corrosivity to metal such as aluminium, copper and the like and non-metallic material such as silicon dioxide and the like, andhas favourable application prospect in the field of microelectronics, such as semiconductor chip cleaning and the like.

The invention relates to a preparation method for a gold plating on the surface of a silicon carbide particle reinforced aluminum-based composite material, and belongs to the technical field of surface engineering. The preparation method comprises the following steps that pretreatment is performed on the silicon carbide particle reinforced aluminum-based composite material; micro-arc oxidation isperformed on the pretreated silicon carbide particle reinforced aluminum-based composite material; surface sensitization, activation and reduction treatment is performed on the material subjected to the micro-arc oxidation; chemical nickel plating is performed on the surface of the material to obtain the material with a nickel layer; and gold plating is performed on the surface of the nickel layerto obtain the gold plating located on the surface of the silicon carbide particle reinforced aluminum-based composite material. According to the preparation method, a ceramic membrane layer is formed, so that the homogenization of chemical properties of an interface of the high-volume-fraction SiCp / Al composite material is realized, it is guaranteed that the subsequent plating is uniform in crystallization, then the porosity of the subsequent plating is reduced, and the compactness of the plating is improved.

The invention provides a rare earth yttrium doped molybdenum disulfide self-lubricating composite coating and a preparation method thereof. Specifically, the molybdenum disulfide self-lubricating composite coating is doped with rare earth yttrium, wherein the molar content of yttrium in the composite coating is 0.1%-5% according to the total molar content of the composite coating. According to themolybdenum disulfide self-lubricating composite coating, sublimed sulfur, yttrium chloride hexahydrate and molybdenum trioxide are adopted as raw materials, and the rare earth yttrium doped molybdenum disulfide self-lubricating composite coating is prepared through the chemical vapor deposition method. The molybdenum disulfide self-lubricating composite coating has good wear resistance and self-lubrication and excellent winding plating property. Coating deposition can be conducted on large-size complex workpieces of a complex shape.

The invention provides a process for concentrating titanium white waste acid through generation of crystalline hydrate by utilizing the phase equilibrium principle. According to the process, ferrous sulfate, copper sulfate or other sulfate capable of forming crystalline hydrates are added into titanium white waste acid, the phase equilibrium process is controlled by utilizing the equilibrium relationship among sulfuric acid, water and sulfate, moisture is brought out by generating sulfate hydrates containing different crystal water and crystallizing and separating the sulfate hydrate from diluted sulfuric acid, and the diluted sulfuric acid can be concentrated; and the separated ferrous sulfate and other crystalline hydrates can be recycled after being dried to remove crystal water; different concentration degrees can be realized by controlling the mode of generated crystalline hydrate and can be adjusted according to requirement, and a concentrated sulfuric acid product having an acidconcentration of higher than 60 percent can be obtained; and anhydrous ferrous sulfate and other sulfates capable of forming crystalline hydrate can be utilized as raw materials, and the raw materials have wide sources. The process is simple, has low operation temperature, small equipment investment and weak corrosion, moisture of waste acid is not needed to be directly evaporated, energy consumption is low, and resource utilization of titanium white waste acid can be realized.

The invention discloses an anti-corrosion flux and a preparation method thereof. The preparation method includes: well mixing glycerin, isobutanol, ethanediol and isopropanol, heating to 74-80 DEG C, stirring while adding tripropylene glycol n-butyl ether, benzotriazole, ergosterol, peanut oil modified acrylic resin, hydroquinone sodium stearate and sodium dodecyl benzene sulfonate, and stirring for 30-40min at a constant temperature; adding rosin, heating to 100-120DEG C, reacting for 60-100min, and well stirring; stirring while adding rest of components, well mixing and performing vacuum filtering to obtain the anti-corrosion flux. The anti-corrosion flux is weak in corrosivity and capable of reducing corrosion of the flux to welded materials and has favorable anti-corrosion effects.

The invention relates to the technical field of phosphorite quality improvement, particularly a sodium fluosilicate production-phosphorite demagging combined treatment method. Sodium sulfate and wastewater generated in the wet-process phosphoric acid sodium fluosilicate coproduction process are utilized and returned to the phosphorite demagging treatment technique so as to utilize the residual sulfuric acid and fluosilicic acid and remove the magnesium element in the phosphorite, thereby enhancing the phosphorite grade. In the treatment process, since the content of sulfuric acid in the wastewater in the fluosilicic acid coproduction process is lower and the fluosilicic acid content is lower, the raw materials added into the reaction kettle for phosphorite treatment have low corrosiveness to the equipment, thereby lowering the cost for the phosphorite grade enhancement treatment. The sulfur element and fluorine element in the sodium fluosilicate sewage can not be abundantly discharged into the environment, thereby providing a new way for sodium fluosilicate sewage treatment, relieving the sodium fluosilicate wastewater treatment load and lowering the environmental pollution.

The invention relates to a method for electroplating a zinc-nickel coating on a magnesium alloy electroplate surface. The method employs a novel pickling activation and zinc immersion pre-treatment technology, wherein an acid solution is the complex formulation solution, the acid solution comprises 10-14g / L oxalic acid, 40-60g / L sodium fluoride, 5-25ml / L phosphoric acid, 2-25g / L ammonium bifluoride and 0.005-5g / L sodium dodecanesulphonate. The activation temperature is 25-35 DEG C, the activation time is 1-5 minutes; wherein the sulfate zinc-immersion technology comprises the following steps: immersing in a zinc-immersion solution comprising 30g of 20-40g / L of zinc sulfate, 5g of 3-7g / L sodium carbonate or potash, 7g of 2-4g / L potassium fluoride and 150g of 100-120g / L potassium pyrophosphate for zinc immersion, wherein the pH of the zinc-immersion solution is between 10.2 and 10.4, the zinc immersion temperature is from 30 DEG C to 70-80 DEG C, wherein the zinc immersion time is 10-15 minutes, and then obtaining the compact and uniform zinc-immersion layer as a base coat for subsequent electroplating. The combination capacity of the coating and a matrix can be increased.

The invention discloses an acrylate adhesive which is a two-component adhesive and comprises a reducing agent and an oxidizing agent, wherein the reducing agent comprises the following components in%age by weight: 30-70% of an acrylate monomer containing at least one vinyl group, 1-10% of methacrylic acid, 5-15% of an elastomer, 0-0.1% of a stabilizer, 5-20% of toughening resin, 0.1-2% of an accelerator, 0.1 to 2% of an activating accelerator, 0 to 10% of a filler, 0.5 to 3% of an adhesion promoter, 1 to 5% of tackifying resin, 0 to 2% of a surface drying promoter, 0.5 to 1.5% of a coupling agent and 0 to 2% of a thixotropic agent. The oxidizing agent comprises the following components in%age by weight: 20-40% of epoxy resin, 15-25% of a plasticizer, 10-15% of polyether polyol, 20-40% of a peroxide, 4%-6% of a thixotropic agent and 0.1%-0.3% of ferric ferrocyanide. The volume ratio of the reduce agent to the oxidizing agent is 10: 1. The acrylate adhesive has weak corrosion to copper, good bonding effect and good storage stability..

The invention discloses a method for extracting and separating tungsten and molybdenum from a molybdenum-contained ammonium tungstate solution. The method comprises the steps that bicarbonate containing trialkyl methyl ammonium and an organic phase of a carbonate composite extractant of the bicarbonate are used for making contact with molybdenum-contained ammonium tungstate feed liquid subjected to vulcanization and an ammonium bicarbonate-ammonium carbonate mixed detergent correspondingly for performing fractional extraction, the molybdenum is made to enter the organic phase, the tungsten remains in a water phase, and a high-purity ammonium tungstate aqueous solution and an organic phase loaded with pure molybdenum are obtained; and then, the organic phase loaded with the pure molybdenumis oxidized through a hydrogen peroxide solution, reextraction is performed by adopting an ammonium bicarbonate-ammonium carbonate mixed solution, a high-purity ammonium molybdate solution is obtained, and an organic phase after reextraction can directly return back to extraction for repeated use without needing treatment. The method has the characteristics that the tungsten and molybdenum mutualseparation depth is high, no detrimental impurity is introduced, and high-purity tungsten and molybdenum product liquid can be obtained simultaneously.

The invention discloses a cleaning agent, which is prepared from a phosphoric acid, a sulfamic acid, zinc nitrate, sodium dodecyl benzene sulfonate, alkyl phenol polyethenoxy ether and water as raw materials. The cleaning agent has a reasonable formula, easily obtained raw materials and low manufacturing cost, has good corrosion inhibition on metallic materials and so on, and particularly has superior cleaning effect on complex dirt.

The invention relates to a hydrocarbon oil demetalization agent and a method for hydrocarbon oil demetalization. The hydrocarbon oil demetalization agent is a keto acid, wherein the keto acid is any of alpha-keto acid, beta-keto acid and gamma-keto acid, and the alpha-keto acid is one of pyruvic acid, 2-ketobutyric acid, phenylpyruvic acid and benzoyl formic acid; the beta-keto acid is acetoacetic acid; and the gamma-keto acid is 4-ketovaleric acid. The method comprises the steps of carrying out mixed contact on hydrocarbon oil, water, the keto acid, which serves as the demetalization agent, and a demulsifier, and then, carrying out electric desalting, so as to achieve oil-water separation and remove metals from the hydrocarbon oil. A molecule of the demetalization agent disclosed by the invention contains a difunctional group, can be in chelation with the metals and can also be in complexation with the metals, so that the demetalization agent has a high removal ratio to the metals in the hydrocarbon oil; according to the demetalization agent, the acidity is between the acidity of organic acids and the acidity of inorganic acids, the corrosiveness is lower than that of the inorganic acids, and the demetalization rate is higher than that of the organic acids; and meanwhile, the demetalization agent is free of elements such as phosphorus, sulfur and nitrogen and thus cannot cause adverse effects on subsequent processing.

The invention provides ashaftplug removal agent for restoring gas wellreservoirpermeability. The shaftplug removal agent is mainly prepared from an alcohol ether compound, formaldehyde, a fluorocarbon surfactant, glucoside, a chelating agent, sulfamic acid and water. The glucoside, the fluorocarbon surfactant and the sulfamic acid are used together, the corrosivity is poor, the product performance is stable under high temperature, and the properties such as composite stopper dissolving speed and reservoirpermeability restoring rate are remarkably improved. The fluorocarbon surfactant contains halogen and has a certain influence on the environment. A trace amount of the fluorocarbon surfactant is added, and the harm to the environment is smaller. The solvent in the agent is water, the water content can be up to 50% or above, and the agent is low in cost, ecological and safe.