92 results about "Diethylene triamine" patented technology

The invention discloses a functional fracturing fluid directly prepared from flow-back fluid of complex water quality. The fracturing fluid is prepared by directly adding a salt-tolerant polymer and an ion trapping agent into the flow-back fluid. The addition amount of the salt-tolerant polymer accounts for 0.15-0.3% of the total mass of the fracturing fluid, and the addition amount of the ion trapping agent is 100-500ppm. The salt-tolerant polymer is prepared by copolymerization of acrylamide, a salt-tolerant monomer and an allyl quinoline monomer, and the molecular weight of the polymer is 4-15 million. The salt-tolerant monomer is acrylamide polyoxyethylene sodium benzenesulfonate or acrylamide sodium sulfonate. The ion trapping agent is prepared from amino trimethylene phosphonic acid, diethylene triamine penta (methylene phosphonic acid), ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, p-methylphenyl diethanol amine, 2, 3-epoxypropyl trimethyl ammonium chloride, fatty alcohol-polyoxyethylene ether, citric acid and tetrahydrofurfuryl acrylate. The fracturing fluid can be directly prepared from the flow-back fluid, the flow-back fluid does not need to be pretreated, and repeated utilization of the fracturing flow-back fluid is achieved.

The invention discloses a carbon quantum dot loaded diatom electrocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving and mixing diethylene triamine pentaacetic acid and salt of metal M1 in water, and performing reflux reaction to obtain a complex solution of the metal M1; adding salt of metal M2 for reflux reaction, filtering after the reaction is finished, and removing a solvent from filtrate to obtain a solid complex of bimetals M1 and M2; drying and calcining to obtain a diatomic electrocatalyst precursor; and carrying out post-treatment and freeze-drying to obtain the diatomic electrocatalyst. The carbon quantum dot loaded bimetallic atom site catalyst is obtained by a preparation strategy of coupling molecular design and quantum dot confinement, and is used for research on deep reduction of carbon dioxide into methane through electro-catalysis. The obtained catalyst has excellent methane production activity on an electro-catalysis carbon dioxide reduction reaction under an alkaline condition and a flow cell configuration, and still has relatively good stability under long-term work.

The invention relates to the field of biological medicine, in particular to a water-soluble alginate microcarrier as well as a preparation method and application thereof. The alginate microcarrier comprises a carrier core structure and a shell surface modifier, the micro-carrier core layer is formed by carrying out plasma crosslinking on water-soluble alginate, ethylenediamine tetraacetic acid salt, nitrilotriacetic acid salt, diethylene triamine pentaacetic acid and water-soluble divalent metal salt, and light-sensitive alginate and a photoinitiator can also be added, so that the micro-carrier core layer has two crosslinking networks; the shell layer is composed of one of gelatin, collagen, fibrinogen, albumin and fibrin, or the gelatin, the collagen, the fibrinogen, the albumin and the fibrin and other biocompatible polymers; the obtained microcarrier has the characteristics of high transparency and rapid degradation, and adherent cells can be amplified in vitro; the microcarrier obtained in the invention can be used for mesenchymal stem cell culture, and can be rapidly degraded under a mild cell condition to harvest cells.

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

The invention relates to a selective nanofiltration membrane as well as a preparation method and application thereof. The selective nanofiltration membrane comprises a support layer and a separation layer, the separation layer is obtained through interfacial polymerization of an oil-phase reactant and a water-phase reactant; the water-phase reactant comprises a negatively charged monomer and a positively charged monomer; the positively charged monomer comprises any one or a combination of at least two of polyvinylamine, polyethyleneimine, diethylenetriamine, water-soluble chitosan, quaternized polyethyleneimine, polyallylamine or triethylene tetramine. According to the method, monomers with different charges are added into a water phase, so that the nanofiltration membrane is wholly charged and neutral, the interception of sodium sulfate can be effectively reduced, the interception of antibiotics is increased, and the separation of the antibiotics and inorganic salts can be efficiently promoted.

The invention belongs to the technical field of compositions for treating wells, and particularly relates to a sulfur dissolving agent for a sulfur-containing gas well. The sulfur dissolving agent consists of the following components in percentage by mass: 30-35% of sodium hydroxide, 2-3% of a dispersion penetrant, 3-6% of a physical sulfur dissolving agent, 2-5% of a catalyst and the balance of water, and the physical sulfur dissolving agent is selected from two or more of polypropylene imine, N-methyl pyrrolidone, triethylene tetramine, diethylenetriamine and methylbenzene. The catalyst is selected from one or more of ethylene glycol, terephthalic acid and sodium p-toluenesulfonate. According to the sulfur dissolving agent, physical sulfur dissolving agents are compounded, on the basis of the polarity similar dissolvability principle and the synergistic effect of the compounded physical sulfur dissolving agents, sulfur can be dissolved in the sulfur dissolving agent more easily, the starting temperature of sulfur dissolving is reduced by introducing a catalyst, and the dissolving performance of the sulfur dissolving agent to sulfur at the normal temperature is improved; and moreover, the heating process can be reduced, the construction cost is saved, and the method can be widely used for removing sulfur deposition blockage of a high-sulfur-content gas well shaft, a ground pipeline, a valve, a screen and the like.

The present application relates to a kind of carbon dioxide mineralization method and carbon dioxide mineralization device.The carbon dioxide mineralization method includes the following steps: mixing absorption liquid and industrial solid waste at room temperature, obtain mortar;Make mortar solid-liquid separation, obtain clear liquid and thick slurry;Carbon dioxide in flue gas is absorbed by clear liquid, obtain carbon-rich absorption liquid;Carbon-rich absorption liquid and thick slurry occur mineralization reaction at 180 DEG C-220 DEG C, obtain mineralized slurry;Make mineralized slurry solid-liquid separation, obtain mineralized ash and mineralized clear liquid;Wherein, absorption liquid includes inorganic base and organic base, organic base includes monoethanolamine, diethanolamine, triethanolamine, 3-methylaminopropylamine, N-methyl diethanolamine, piperazine, diethylene triamine, triethylene tetramine, tetraethylene pentamine and 2-amino-2-methyl-1-propanolamine at least two kinds.The method greatly improves CO2 capture rate and CO2 utilization rate, and organic base consumption is less, absorption liquid regeneration energy consumption is low, and overall economy is good.

The application discloses an oil and gas field polymer solution viscosity protection system with improved ferrous ion tolerance, and belongs to the technical field of oil and gas field chemicals.The system comprises the following components in mass percentage: 5-10% of a ferrous ion stabilizer, 10-20% of a free radical capturing agent, 10-20% of a structure reinforcing agent, 5-10% of a synergist, and the balance of water; the ferrous ion stabilizer is at least one selected from sodium gluconate, potassium gluconate, diethylene triamine pentaacetic acid and hydroxyethylidene diphosphonic acid; the free radical capturing agent is a compound containing phenolic hydroxyl; the structure reinforcing agent is an imidazoline compound; and the synergist is an aldehyde compound.The application method of the viscosity protection system is as follows: the viscosity protection system is first added into liquid water, polymer powder is then added, a gel breaker is further added, and stirring is uniformly performed to obtain a polymer solution.The viscosity protection system significantly reduces the influence of ferrous ions on the viscosity of the polymer solution, and improves the application effect of polyacrylamide substances in the field of oil and gas fields.

The invention discloses a high-simulation multifunctional artificial simulated sputum and a preparation method thereof. The artificial simulated sputum is characterized by comprising the following components: 6-8% (w / v) of pig mucin; 0.4% (w / v) of low molecular weight salmon sperm DNA; 0.0059% (w / v) of diethylene triamine pentaacetic acid; 5% (w / v) of sodium chloride; 2.2% (w / v) of potassium chloride; 1.81% (w / v) of tris (hydroxymethyl) aminomethane; 0.1% (w / v) of cystine; 5 ml of egg yolk emulsion; nutrition and growth factors; a microbial simulation component; and a stability and protective agent; the simulated sputum prepared by the method is close to real sputum in component, physicochemical property and biological activity, and has good stability and repeatability.

The invention discloses an in-situ leaching liquid injection system and method for high-altitude ionic rare earth ore, and belongs to the field of rare earth hydrometallurgy. The system is composed of a liquid injection well pattern, a layered liquid injection device, a first liquid supply system, a second liquid supply system and a collection system. Exploring the thickness of an ore body weathering crust and vertical distribution of rare earth / impurities; the liquid injection hole is vertically divided into an upper layer liquid injection area (1 / 3-1 / 2 of the upper part) and a lower layer liquid injection area (1 / 2-2 / 3 of the lower part); a 1.0-1.4 wt% low-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the upper layer, and co-leaching of impurities such as aluminum and iron is reduced; 1.5-2.5 wt% of high-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the lower layer to ensure efficient leaching of rare earth; and rare earth-rich leaching liquid is collected. Compared with a traditional full-layer high-concentration process, the method has the advantages that the use amount of a leaching agent is reduced by 20-40% while the rare earth leaching rate is kept to be larger than or equal to 90%, the aluminum ion concentration of the leachate is reduced by 30-60%, the agent cost and the follow-up impurity removal load are remarkably reduced, and the method is particularly suitable for the high-altitude, low-temperature, low-air-pressure and thick-weathered crust environment.

The invention relates to the field of coatings, in particular to a solvent-free epoxy coating. The solvent-free epoxy coating comprises a component A and a component B, wherein the component A comprises bisphenol A type epoxy resin, a reactive diluent, a flatting agent, a defoaming agent and an anti-settling agent; and the component B comprises a curing agent oxalic acid modified isophorone diamine and a Mannich base modified diethylenetriamine. After the curing agent provided by the invention is used, the surface drying time and the hard drying time are obviously improved, and the coating can be completely cured more quickly, so that the coating can be subjected to subsequent processing treatment or put into use in advance, and the whole production process is accelerated.

The application provides an anti-carbon dioxide corrosion inhibitor, a preparation method and application thereof, and relates to the technical field of oil and gas field corrosion protection. The application provides an inhibitor, raw materials of which include alpha-lipoic acid, diethylene triamine, formaldehyde, 2-naphthyl ethyl ketone and benzyl chloride in a molar ratio of 1.0-1.2:0.8-1.2:1.2-2.0:1.0-1.4:1.0-1.4. The application also provides a preparation method, raw materials are taken according to the molar ratio, alpha-lipoic acid and diethylene triamine are mixed to obtain a first product through reaction; formaldehyde and 2-naphthyl ethyl ketone are mixed with the first product to obtain a second product through reaction; benzyl chloride and the second product are mixed to obtain a finished product inhibitor through reaction. The application also provides application of the inhibitor in preventing carbon dioxide corrosion. The inhibitor has good corrosion inhibition effect, a simple preparation method, a stable structure, and still has superior corrosion inhibition effect in a high salinity environment.

The invention discloses an HRP chemiluminescent substrate system, a kit and a preparation method, the HRP chemiluminescent substrate system is composed of a liquid A and a liquid B which are physically isolated and stored; the solution A is an alkaline buffer system with the pH value of 9.0-9.6, and comprises isoluminol or a salt substrate thereof, a cationic surface active agent CTAC and a metal chelating agent diethylene triamine pentaacetic acid; and the solution B is an acidic solution with the pH value of 4.5-5.5, and comprises an oxidizing agent and a reinforcing agent N-(3-chloro-4-hydroxyphenyl) acetanilide. According to the invention, the reinforcing agent N-(3-chloro-4-hydroxyphenyl) acetanilide is placed in the acidic liquid B, when the acidic liquid B is mixed with the alkaline liquid A, the mixed system is maintained at a specific pH value of 8.3-8.6, and the reinforcing agent is rapidly dissociated into phenoxy anions; and carrying out in-situ capture and enrichment on a micelle interface by CTAC cationic micelles with positive charges, which exist in the solution A in advance, through electrostatic attraction. And in cooperation with a low-ion-strength environment brought by no buffer salt in the liquid B, the system ensures the high activity of the HRP enzyme, realizes directional interface catalysis of the enhancer, and significantly improves the luminous efficiency and stability.

The present application relates to the technical field of powder coatings, and more specifically, it relates to a wear-resistant pipeline powder and a preparation method thereof. A wear-resistant pipeline powder comprises the following raw materials in parts by weight: 20-30 parts of polyurethane powder, 40-50 parts of modified epoxy resin powder, 8-14 parts of curing agent, 15-25 parts of nano wear-resistant particles and 4-6 parts of auxiliary agent; the modified epoxy resin comprises adipic acid-based epoxy resin and bisphenol A-type epoxy resin, the curing agent is obtained by mixing diethylenetriamine and polyamide curing agent 650, and the wear-resistant particles are molybdenum disulfide / copper sulfide nano hybrid materials. The coating obtained by curing the pipeline powder of the present application has excellent low-temperature wear resistance and antibacterial properties.

The invention relates to the technical field of medicines, in particular to a preparation process of xantinol nicotinate injection and an impurity control method of the xantinol nicotinate injection. According to the process, water for injection is subjected to nitrogen deoxidation treatment, a whole-process nitrogen-sealed environment is maintained, xantinol nicotinate is gradually added in three times, and a multi-component synergistic stable system including hydroxypropyl-beta-cyclodextrin, N-acetyl-L-cysteine, L-methionine, diethylenetriamine pentaacetic acid, sodium metasulfite, sodium thiosulfate and the like is matched, so that the xantinol nicotinate injection is prepared. Double-molecular-weight dextran is introduced to regulate and control a microenvironment, an acetic acid-sodium acetate buffer system is introduced to optimize pH, and finally, high stability and low impurity generation of the finished injection at high temperature are realized through nitrogen replacement subpackaging and precise sterilization conditions. According to the method, the content and the purity of the xantinol nicotinate injection are remarkably improved, the impurity content during sterilization and storage is remarkably reduced, the safety and the effectiveness of drugs are guaranteed, and the method has important significance on optimization of a heat-sensitive injection process.

The present invention discloses an iodine detection indicator card and its application, belonging to the technical field of gaseous iodine detection. The iodine detection indicator card is prepared by adding an iodine detection indicator into a carrier, mixing the iodine detection indicator evenly, and then scraping the iodine detection indicator onto a clean glass to form a detection indicator card; the carrier is a polymer, a resin, or paper; the iodine detection indicator is obtained by heating sulfur powder and stannous chloride powder in diethylenetriamine. The iodine detection indicator card of the present invention has different degrees of color change effect at different iodine vapor concentrations, can identify iodine vapor in different concentration ranges, and has a fast response during detection, changing color when encountering iodine, does not require complicated operation steps and professional skills, is easy to carry and use, is suitable for rapid on-site detection, and is more affordable and has a lower cost when a large number of test samples are required.

The present application relates to a kind of waste carbon fiber bismaleimide resin matrix composite fast degradation recycling method, comprising: step one: carbon fiber reinforced bismaleimide resin matrix composite is cut;Step two: after cutting, carbon fiber reinforced bismaleimide resin matrix composite and diethylene triamine solvent are mixed according to mass ratio 1:5~1:40 to form reaction system, heated to 170~190 DEG C, constant temperature reaction 3~5h, after reaction, natural cooling to room temperature;Step three: solid product carbon fiber and resin degradation product solution are obtained by separation, after washing and drying, carbon fiber is recycled, and the resin degradation product solution is subjected to vacuum distillation, and the resin degradation product and diethylene triamine solvent are recycled.The present application is simple in operation, mild in condition, high in recovery rate, the surface of recycled carbon fiber is clean and neat, and the mechanical property retention rate is high;Resin matrix and reaction solvent can be separated and recycled simultaneously, responding to green and sustainable development green and efficient.

The invention relates to fluorescent test paper for visually, efficiently and accurately detecting Cu < 2 + > and a preparation method of the fluorescent test paper, and particularly relates to fluorescent carbon dots synthesized by taking citric acid and diethylenetriamine as raw materials and using a micro-channel reactor, and relates to the technical field of nanomaterials. The fluorescent test paper is prepared by the following steps: i) taking cellulose test paper as a carrier and uniformly carrying a large number of carbon dots; and ii) a copper ion solution can be dropwise added on the test paper to analyze the change of RGB values to prepare a colorimetric card, and the color change of the test paper is judged by combining the colorimetric card and a fluorescent flashlight, so that the copper ions are visually and quantitatively analyzed. During detection, the carbon dots and Cu < 2 + > are subjected to fluorescence quenching reaction, so that visual accurate detection can be realized. The method is accurate, rapid and convenient to operate, visual detection of ions is achieved, and a novel efficient scheme is provided for real-time detection of Cu < 2 + > in the industry.

The invention relates to a high red hardness alloy material and a preparation method thereof, belonging to the technical field of alloy materials; the alloy material is composed of an M2 high-speed steel substrate and a cladding layer, wherein the cladding material of the cladding layer is the following components: 52-58wt% of N-tungsten carbide tantalum micropowder, 6.5-9wt% of chromium carbide powder and 3.2-4.4wt% of nickel powder, and the remainder is atomized iron powder; the N-tungsten carbide tantalum micropowder is substituted by diethylenetriamine and cyanuric chloride to prepare a nitrogen-carbon-rich compound cluster, i.e., a template agent; the complexation of a multi-component nitrogen structure in the template agent structure is utilized to capture tungsten and tantalum elements in a liquid phase environment, and high-temperature hydrolysis is performed to form a composite, i.e., a precursor; during a sintering process in a plasma sintering furnace, the template agent is thermally decomposed to form a composite carbide with tungsten and tantalum; the decomposed nitride is in-situ nitrided and doped with the composite carbide at a high temperature to form nitrogen-doped tungsten carbide tantalum particles; and the hardness of the cladding layer reaches 63.9-65.1HRC.

The invention discloses a method for extracting tellurium from a sodium tellurite solution through electrodeposition, and belongs to the technical field of non-ferrous metal hydrometallurgy. The method comprises the following steps: dissolving crude tellurium dioxide in a sodium hydroxide solution at 60-90 DEG C to prepare a sodium tellurite electrolyte containing 200-240 g / L of tellurium and 90-110 g / L of sodium hydroxide; in the electrodeposition process, a composite additive composed of sodium ascorbate, pentasodium diethylenetriamine pentaacetate, sodium citrate and polyvinylpyrrolidone is synchronously added into the electrolyte. And carrying out electrodeposition for 14-15 days under the conditions that the current density is 40-60A / m, the voltage is 15-30V and the temperature is 15-30 DEG C. Through the synergistic effect of the composite additive, tellurite radicals in the anode region are remarkably inhibited from being oxidized into insoluble sodium tellurate, heavy metal impurity ions in the electrolyte are strongly complexed, and therefore the direct recovery rate of tellurium is increased to 90% or above while the better current efficiency is kept, and the purity of the obtained tellurium ingot reaches 99.95% or above.

The application discloses a culture medium and a process method for reducing cell lactic acid accumulation, which is based on a cell basic culture medium, and after removing original copper ion compounds and DTPA, nitrilotriacetic acid, citric acid and histidine in the basic culture medium, contains the following components and concentration ranges: copper chloride 0.2-0.5 mg / L, copper nitrate 0.2-0.5 mg / L, copper sulfate 0.2-0.5 mg / L, diethylene triamine pentaacetic acid 1-5 mg / L, nitrilotriacetic acid 1-5 mg / L, citric acid 1-5 mg / L, and histidine 0.5-3 g / L; the mass concentration ratio of the copper chloride, the copper nitrate and the copper sulfate is 1:1-5:1. Compared with the prior art, the application has the advantages that: compared with the prior art, the culture medium of the application can inhibit lactic acid generation and promote lactic acid oxidation and decomposition through the synergistic effect of copper ions, chelating agents and metabolism-related substances, and the effect of reducing lactic acid accumulation is remarkable.

The present invention discloses a method for preparing antibacterial, soft, and anti-powdering dust-free paper and disposable sanitary products. The method comprises: preparing chlorinated fatty alkyl dimethyl tertiary amine by reacting with benzyl chloride; preparing polyamide epichlorohydrin resin by using diethylenetriamine, adipic acid, and chlorinated epichlorohydrin as raw materials; adding chlorinated fatty alkyl dimethyl benzyl ammonium chloride to polyamide epichlorohydrin resin to prepare antibacterial, soft, and anti-powdering resin; spraying the prepared antibacterial, soft, and anti-powdering resin on the surface of fluff pulp and ES fiber web, and consolidating with hot air to obtain dust-free paper with antibacterial activity. In the present invention, chlorine replaces the electron-withdrawing group so that the cationic charge of the ammonium group on the polyamide epichlorohydrin resin is greater than the cationic charge of the ammonium group of fatty alkyl dimethyl benzyl ammonium chloride, and the ammonium group of the polyamide epichlorohydrin resin is adsorbed on the fluff pulp fiber, while the ammonium group of fatty alkyl dimethyl benzyl ammonium chloride is away from the fluff pulp fiber, so that the ammonium group is exposed and exerts antibacterial activity.

The invention relates to the technical field of constructional engineering materials, and discloses a film spraying material for a tunnel and a preparation method of the film spraying material. The invention discloses a film spraying material for a tunnel. The film spraying material is prepared from the following raw materials in parts by mass: 140 to 160 parts of acrylic acid, 20 to 30 parts of methacrylic acid, 5 to 10 parts of N-hydroxyethyl acrylamide, 5 to 10 parts of diethylenetriamine, 180 to 220 parts of modified bentonite, 40 to 60 parts of modified silicon carbide, 2 to 5 parts of dispersing agent, 2 to 5 parts of defoaming agent and 290 to 310 parts of water. The film spraying material for the tunnel, provided by the invention, is subjected to water seepage detection for 120min under 0.4 MPa, does not seep water and has excellent waterproof performance; after alkali treatment, the tensile strength of the film spraying material for the tunnel can reach 1.1 MPa, the elongation at break of the film spraying material can reach 465%, after salt treatment, the tensile strength of the film spraying material can reach 1.0 MPa, the elongation at break of the film spraying material can reach 468%, and the film spraying material has excellent weather resistance.

The present invention relates to the technical field of dry powder polymers, and in particular to an online mixing and fracturing method for dry powder polymers for oil and gas fields. S1.1, weighing the following raw materials in parts by weight: 1-10 parts by weight of a thickener, 18-23 parts by weight of hydroxypropyl guar gum, 11-15 parts by weight of polyacrylamide, 2-6 parts by weight of borax, 1-3 parts by weight of zirconate, 3-6 parts by weight of a sodium hydroxide pH value regulator, 0.1-0.5 parts by weight of a diethylenetriamine pentaacetic acid antiscalant, and 0.5-0.7 parts by weight of sodium lauryl sulfate; The thickener is prepared by mixing polyethyleneimine and 6-[(4-azido-2-nitrophenyl)amino]hexanoic acid sulfonic acid succinimide ester in a mass ratio of 1:0.05-0.1; S1.2, adding raw materials into a dry material system and mixing them evenly; S1.3, adding water and mixing in a high-speed agitator to prepare a fracturing fluid; the thickener is used to increase the viscosity of the polymer through a double cross-linking mechanism, enhance the stability of the fracturing fluid, improve the sand carrying capacity and suspension capacity of the fracturing fluid, and broaden the applicability of the fracturing fluid.

The invention relates to a preparation method of ultra-pure electronic-grade pentamethyldiethylenetriamine, and belongs to the technical field of purification of electronic chemicals. The invention aims to solve the technical problem that a by-product N, N-dimethyl piperazine in industrial-grade PMDETA is difficult to efficiently remove. According to the method, industrial-grade PMDETA is used as a raw material, and the method sequentially comprises the steps of microfiltration, ion exchange, vacuum distillation and nanofiltration. Wherein the step of vacuum rectification is carried out under the conditions that the absolute pressure is 1.0-8.0 kPa, the temperature of a tower kettle is 125-160 DEG C and the reflux ratio is 2: 1-6: 1, and efficient separation of N, N-dimethyl piperazine and PMDETA is realized by accurately controlling process parameters. The purity of the finally prepared PMDETA product is larger than 99.99%, the content of N, N-dimethyl piperazine is lower than 16 ppm, meanwhile, the content of metal ions is lower than 10 ppt, the number of particles meets the electronic grade standard, and the method is suitable for the fields of semiconductor and integrated circuit manufacturing and the like.

The invention belongs to the field of uranium removal materials, and provides uranium adsorption montmorillonite / chitosan composite hydrogel and a preparation method and application thereof.The preparation method comprises the steps that a diethylenetriaminepenta (methylene phosphonic acid) solution is added into a chitosan suspension to adjust the pH to be acidic, a reaction is conducted, and an organic phosphonated chitosan solution is obtained; mixing the organic phosphonated chitosan solution with a montmorillonite suspension, and carrying out an intercalation reaction to obtain a mixed solution; mixing the mixed solution with a potassium tripolyphosphate solution, carrying out a first cross-linking reaction to obtain a flocculent suspension, carrying out solid-liquid separation, and dissolving the flocculent suspension in water again to obtain a suspension; and uniformly mixing the suspension liquid with a sodium alginate solution, dropwise adding the mixture into a calcium salt solution, carrying out a second cross-linking reaction to obtain gel microspheres, and carrying out solid-liquid separation and washing to obtain the uranium adsorption montmorillonite / chitosan composite hydrogel. According to the preparation method disclosed by the invention, a potassium tripolyphosphate cross-linked organic phosphonated chitosan molecular chain is successfully introduced into a montmorillonite interlayer structure, so that the morphology structure of original montmorillonite is greatly improved, active sites on the montmorillonite lamellar structure are enriched, and the application efficiency of montmorillonite in uranium-containing wastewater is improved.

The invention belongs to the field of herbicides, and specifically discloses a green herbicide containing clofonate-mexyl and a preparation process thereof. The herbicide comprises clofonate-mexyl, a complexing agent, a synergistic complexing agent, a moisturizing agent, a safener, a surfactant and deionized water; the complexing agent is selected from one of oxalic acid, tartaric acid and sodium citrate; the synergistic complexing agent is selected from one of diethylenetriamine pentaacetic acid pentasodium and diethylenetriamine pentaacetic acid calcium sodium; the safener is clofonate-mexyl; the moisturizing agent is selected from one or more of isopropyl alcohol, trehalose and polyethylene glycol; the surfactant is selected from one or more of alkyl glycosides, cocamidopropyl betaine and N-acyl sarcosinate; the green herbicide does not contain an organic solvent, has no residue, has little harm to farmland and has low preparation cost.

The invention relates to the technical field of board adhesives, in particular to a preparation method of an aluminum-wood composite board adhesive, which comprises the following steps: S1, preparation of a hyperbranched epoxy resin prepolymer: dissolving chitin in methanol, dropwise adding ethylene glycol diglycidyl ether under the protection of nitrogen, then adding modified mica powder, and stirring to obtain the hyperbranched epoxy resin prepolymer; dropwise adding a diethylenetriamine methanol solution and ethylene glycol diglycidyl ether at the same time, and reacting to remove methanol; s2, preparation of a water-based hyperbranched epoxy resin-polyurethane emulsion: mixing the multifunctional water-based polyurethane emulsion with the hyperbranched epoxy resin prepolymer, adding a pH buffer agent, an inhibitor, a protective colloid aqueous solution, a dispersant and deionized water, stirring for reaction, cooling to room temperature, adding a thickening agent aqueous solution, and stirring to obtain the adhesive. The modified mica powder is good in compatibility with epoxy resin, and the prepared adhesive is excellent in adhesive performance.

The invention discloses a modified montmorillonite-based lubricant and a preparation method thereof, and belongs to the technical field of lubricants, oleic acid and diethylenetriamine are cyclized and quaternized to prepare an oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor, the oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor is used for organic modification of nano montmorillonite, a silane coupling agent is further adopted for silanization treatment, and the modified montmorillonite-based lubricant is prepared. The preparation method comprises the following steps: preparing silane modified corrosion-inhibition montmorillonite, carrying out in-situ polymerization coating by taking a urea-formaldehyde prepolymer as a wall material to form montmorillonite modified corrosion-inhibition microcapsules, and carrying out copolymerization on acrylic acid, N, N-bis (2-hydroxyethyl) aminomethylene diethyl phosphonate and trifluoromethacrylate to obtain the modified polyacrylate dispersant with heat-resistant and dispersion-stable functions. The microcapsule, a dispersing agent, dibasic acid ester oil, PAO base oil and an antioxidant are compounded in proportion to form the modified montmorillonite-based lubricant.

The invention relates to a method for jacketing elongate articles, such as lines or cable harnesses in particular, by means of an adhesive tape comprising a tape-shaped substrate, which substrate has, on at least one side, a thermally curable, meltable, preferably pressure-sensitive adhesive layer, the adhesive layer comprising an epoxide-functionalized acrylonitrile-butadiene copolymer which has on average more than 1.5 epoxide groups per molecule and comprising the reaction product of phthalic anhydride and diethylene-triamine, the adhesive tape being led in a helix around the elongate article or the elongate article being enveloped by the adhesive tape in the axial direction, the elongate article together with the enveloping adhesive tape being brought into the desired arrangement, in particular into the cable harness plan, the elongate article being held in this arrangement, and the curable adhesive mass being cured by supplying thermal energy, in particular at a temperature of up to 110° C.