164 results about "Disodium edetate dihydrate" patented technology

The invention relates to a method for preparing fluorescent silica nanospheres and belongs to the technical field of inorganic chemistry and material synthesis. The main process of the method of the invention mainly comprises: (1) according to the prior art, calcining a certain amount of ethylene diamine tetraacetic acid (EDTA-2Na) at 250 to 400 DEG C in the presence of N2 in a tube furnace to obtain fluorescent carbon quantum dots; (2) mixing the fluorescent carbon quantum dots, deionized water, octadecylamine and methylbenzene, reacting at 160 to 180 DEG C for 12 hours, centrifuging, separating, collecting supernate and drying to obtain octadecylamine-modified fluorescent carbon quantum dots; and (3) mixing the octadecylamine-modified fluorescent carbon quantum dots with water, ethanol,ammonia water and ethyl orthosilicate, reacting at 40 DEG C for 1 to 12 hours, adding the ethyl orthosilicate and the hexadecy ltrimethyl ammonium bromide, reacting for 1 to 12 hours, washing with ethanol, centrifuging, drying and calcining at 300 DEG C for 3 hours and thus obtaining the fluorescent silica nanospheres.

The invention relates to polydopamine microcapsules and a preparation method thereof. The polydopamine microcapsules are prepared from dopamine serving as a raw material and calcium carbonate particles serving as templates in a mass ratio of 0.1:1-10:1. The preparation method comprises the following steps of: preparing the calcium carbonate particles serving as the templates; adsorbing the dopamine on the templates so as to form polydopamine membranes on the templates by the self-polymerization of the dopamine; reacting for a certain period of time; and removing a calcium carbonate kernel by using ethylene diamine tetraacetic acid disodium after the polydopamine membranes on the templates reaches a certain thickness. For the microcapsules prepared by the method, a preparation process is simple and is convenient to operate, an acid-base catalyst and an organic solvent are saved, the raw material is readily available, the thickness of each membrane is easy to control through the assembly of different layers, the size of each particle is controllable, stability and repeatability are high and a wide application range is achieved.

The invention belongs to the technical field of preparation of additives, and in particular relates to a chlorine-free and alkali-free liquid setting accelerator and a preparation method thereof. The preparation method comprises the steps of adding aluminum sulfate and aluminum hydroxide into deionized water, and heating to obtain mother liquor of aluminate; then, adding magnesium fluosilicate and disodium ethylenediamine tetraacetate into the deionized water, and heating to obtain a magnesium fluosilicate solution; mixing the magnesium fluosilicate solution with the mother liquor of aluminate, then adding organic amine, organic acid and a stabilizer, and stirring to obtain the chlorine-free and alkali-free liquid setting accelerator. The setting accelerator prepared by the method has the characteristics of being small in mixing amount and good in setting acceleration effect; furthermore, after the setting accelerator is used, the mechanical properties of the concrete are improved, and the compressive strength of the concrete is increased; therefore, the chlorine-free and alkali-free liquid setting accelerator is an ideal concrete additive.

The invention discloses a preparation method of polymer micro-capsules inspired by polyphenols chemistry. Based on polyphenols chemistry, the preparation of micro-capsules is carried out by taking calcium carbonate micro-spheres as templates, and tannic acid and polyethylene imine as raw materials. The tannic acid can be subjected to oxidative polymerization under the weak alkaline condition, a formed tannic acid oligomer can be adsorbed on the surfaces of the calcium carbonate micro-spheres, then the polyethylene imine is utilized for crosslinking the tannic acid oligomer to form a tannic acid oligomer / polyethylene imine coating, and finally the calcium carbonate micro-spheres are removed by utilizing ethylenediaminetetraacetic acid to obtain tannic acid oligomer / polyethylene imine polymer micro-capsules. According to the preparation method disclosed by the invention, the preparation raw materials are cheap and easy to obtain, the preparation conditions are mild, the preparation technology is simple and feasible, and the regulation and control of the morphology of the micro-capsules and the thickness of walls of the micro-capsules can be achieved by changing the concentration of the tannic acid and the concentration of the polyethylene imine in a preparation process.

The invention relates to a chemical washing method of reverse osmosis, which belongs to industrial wastewater processing technologies. The method which comprises four links of pickling, coarse alkali washing, fine alkali washing, and sterilization washing is characterized in that: a pickling washing agent added in the pickling link is citric acid with the weight of 120kg; an alkali washing agent added in the coarse alkali washing link is a mixture containing 60kg of sodium hydroxide and 6kg of sodium dodecanesulphonate, or a mixture containing 60kg of disodium ethylenediaminetetraacetate and 6kg of sodium dodecanesulphonate; and an alkali washing agent added in the fine alkali washing link is a mixture containing 50kg of MCT511, 30kg of disodium ethylenediaminetetraacetate, and 6kg of sodium dodecanesulphonate. The method of the present invention which allows organic pollutants and biomembrane scale deposits to be effectively washed has the advantages of system operation cost reduction, reverse osmosis membrane replacing frequency reduction, and resource saving.

The invention relates to a method for removing metal ions of paper pulp and bleaching and relates to a technique for removing metal ions of paper pulp and applications thereof in bleaching, belonging to the technical field of paper making. The method comprises the following steps of: (1) carrying out pretreatment for removing metal ions of the paper pulp, namely under the existence of Mg(CH(3)COO)2, Ca(CH(3)COO)2 and EDTA (disodium ethylene diamine tetraacetate), carrying out bleaching pretreatment to deoxidizing sulfate pulp; and (2) carrying out following no-pollution bleaching, carrying out following secondary bleaching treatment consisting of a peroxyacetic acid bleaching stage and a hydrogen peroxide bleaching stage on the paper pulp after the pretreatment for removing metal ions. The invention is simple and easy to operate and has obvious effect; the removal rate of the metal ions is high, and the removal rate of Mn is 80.5 percent. Compared with the conventional EDTA chelation treatment, the strength performance of the paper pulp can be improved; the Mg(CH3COO)2 and the Ca(CH3COO)2 can replace 60 percent of EDTA, consequently, the accumulative effect toxicity of the conventional chelating agent can be obviously reduced.

The invention discloses a preparing method and application of fluorescence-imaging copper-and-nitrogen-doped carbon quantum dots with the dual-light-treating effect. The carbon quantum dots prepared with the method can emit blue fluorescence, and meanwhile the photo-thermal effect, the photodynamic treating effect and the fluorescence imaging effect can be achieved. According to the preparing method, ethylenediamine tetraacetic acid disodium salt and copper chloride dihydrate serve as raw materials, and the copper-and-nitrogen-doped carbon quantum dots are prepared. According to the preparing method and application of the fluorescence-imaging copper-and-nitrogen-doped carbon quantum dots with the dual-light-treating effect, the raw materials are low in cost and easy to obtain and prepare, and an obtained product has the good biocompatibility and the good water solubility, can emit the blue fluorescence, has the absorbing effect and the good photothermal conversion efficiency in infrared and near infrared regions, has the photosensitization effect, and can generate reactive oxygen for photodynamic therapy under illuminating of near-infrared light. The copper-and-nitrogen-doped carbon quantum dots prepared with the method have broad application prospects in the photothermal therapy aspect, the photodynamic therapy aspect, the bioimaging aspect and the like.

The invention discloses a temperature-resistant calcium-tolerant inverse emulsion polymer for drilling fluids. The polymer is prepared by polymerization of a sulfonic acid group-containing monomer water solution with a mass fraction of 50%, N, N-dimethylacrylamide, acrylamide, a crosslinking agent, water, white oil, a span-80 emulsifier, a propylene glycol monolaurate emulsifier, an OP-15 or Tween-80 emulsifier, an ammonium persulfate water solution or a potassium persulfate water solution with a mass fraction of 10% as an initiator, a sodium thiosulfate water solution with a mass fraction of 10%, an azodiisobutyl imidazoline hydrochloride solution with a mass fraction of 5%, soda ash, and an ethylenediaminetetraacetic acid disodium salt. The inverse emulsion polymer provided in the invention has good abilities of filtration loss reducing, viscosity increasing, flow pattern regulating, hydration dispersion inhibiting of clay and drill cuttings, and can improve filter cake quality, enhance drilling fluid lubricity, thus being suitable for various water-based drilling fluids and being able to be used as a high-temperature, high-salt and high-calcium drilling fluid additive.

The present invention discloses preparation process of low molecular weight polyacrylamide, and the preparation process is one water solution polymerization process with ethanol as heat transferring solvent, sodium formate as chain transferring agent, ammonium persulfate as initiator, and EDTA disodium salt as stabilizer. Through continuously dropping of acrylamide solution and initiator solution, reflux polymerization at 80-90 deg.c and regulating the consumption of sodium formate and initiator, polyacrylamide of molecular weight (1.0-2.6)*10<4> is synthesized. Thus synthesized low molecular weight polyacrylamide has excellent water solubility, and is suitable for use as polymer emulsifier, dispersant, adhesive, etc.

The invention discloses a municipal sludge pretreatment method enhancing sludge anaerobic fermentation acid production. The method enables sludge cells to rupture, enables organic matter to be released and converted in a superior-quality mode to the most extent and remarkably increases the quantity of organic acid produced through follow-up anaerobic fermentation by jointly inputting neutral protease and ethylene diamine tetraacetic acid disodium salt (EDTA-2Na) and adjusting potential of hydrogen (pH) and reaction temperature. Test results show that by means of the municipal sludge pretreatment method, the concentration of soluble chemical oxygen demand (SCOD) in sludge is improved by 18.0-20.0 times, the concentration of polysaccharide is improved by 11.0-13.0 times, and the concentration of protein is improved by 1.5-2.5 times. The municipal sludge pretreatment method has the advantages of being moderate in reaction condition, high in efficiency, high in sludge quantity reducing degree and the like. A new method and idea is provided for the purpose of finally achieving recycling, reduction and harmlessness of excess sludge.

The invention relates to a preparation method of a carbon nano tube / copper powder, and belongs to the field of new material preparation. The method comprises the steps that a carbon nano tube is put into concentrated HCl for ultrasonic treatment and stirring, and a purified carbon nano tube is obtained; the purified carbon nano tube is put into a mixed solution of concentrated H2SO4 and concentrated HNO3, stirring is carried out at the temperature ranging from 50 DEG C to 60 DEG C, and an oxidized carbon nano tube is obtained; stannous chloride is added into a dilute HCl solution, then the oxidized carbon nano tube is added, ultrasonic treatment and stirring are carried out at the temperature ranging from 50 DEG C to 60 DEG C, and a sensitized carbon nano tube is obtained; palladium chloride is added into the dilute HCl solution, then the sensitized carbon nano tube is added, ultrasonic treatment and stirring are carried out, and an activated carbon nano tube is obtained; after being mixed, a copper sulfate solution and an ethylene diamine tetraacetic acid solution are stirred at the temperature ranging from 50 DEG C to 60 DEG C, the pH of the solution is adjusted, and a copper salt plating solution with the pH ranging from 7 to 12 is obtained; and the activated carbon nano tube is added into the copper salt plating solution, then formaldehyde is added, the pH of a reaction solution is adjusted for a reaction, and the carbon nano tube / copper powder is obtained.

The invention discloses medical yttrium-90(<90>Y) carbon microspheres for treating tumors and a preparation method thereof. The medical yttrium-90 series carbon microspheres are complex compounds (90Y-EDTA) prepared by enabling a series carbon microsphere adsorbed <90>YCl3 solution and a disodium ethylene diamine tetraacetate solution to react. According to the medical yttrium-90 series carbon microspheres disclosed by the invention, the adsorption and curing efficiency on yttrium-90 nuclide is higher than 99 percent; after the carbon microspheres are further subjected to purification treatment, the releasing rate of the medical yttrium-90 series carbon microspheres on yttrium-90 is less than 0.01 percent; the medical yttrium-90(<90>Y) carbon microspheres have good biocompatibility and canbe used for radiotherapy in-vivo tumors.

The invention relates to biological sample preserving fluid, in particular to excrement microbial sample DNA preserving fluid. Ethylene diamine tetraacetic acid disodium (EDTA-2Na) of 0.15 to 0.35 mol / L, sodium chloride (NaCl) and dimethyl sulfoxide (DMSO) with the mass percent being 12 to 28 percent are dissolved in the excrement microbial sample DNA preserving fluid provided by the invention, and the pH value is adjusted to be 6.0 to 9.0. The excrement microbial sample DNA preserving fluid provided by the invention is suitable for preserving excrement microbial samples at normal temperature, is simple to operate and high in applicability, and can be applied to large-scale sample detection.

The invention relates to a silicon oxide and protamine microcapsule and a preparation method thereof. The silicon oxide and protamine microcapsule is prepared by using a calcium carbonate particulate as a template and sodium silicate and protamine as raw materials, wherein the mass ration of the sodium silicate to the protamine is 1:1-7:1. The preparation method comprises the following steps: firstly preparing the calcium carbonate particulate with negative charges as the template; interacting the protamine with positive charges and the calcium carbonate particulate with negative charges and alternately absorbing to the template; inducing the forming of silicon oxide by using the biomineralizing function of the protamine when three to five double-layers are generated on the template; removing the inner core of the calcium carbonate by EDTA-2Na. The invention is gentle in reaction conditions during the preparation of the silicon oxide and protamine microcapsule. The prepared silicon oxide and protamine microcapsule has the advantages of gentle reaction condition, size controllability, good stability, and excellent repeatability.

The invention discloses a formula of veterinary chlortetracycline hydrochloride soluble powder and a preparation method thereof. The soluble powder is prepared from the following components in percentage by weight: 10-50 percent of chlortetracycline hydrochloride, 0.2-3.0 percent of sodium dodecyl sulfate, 0.1-1.0 percent of ethylenediamine tetraacetic acid disodium salt and the balance of glucosum anhydricum. The chlortetracycline hydrochloride is utilized as a raw material, sodium dodecyl sulfate is added as an absorption enhancer, and ethylenediamine tetraacetic acid disodium salt is utilized as an antioxidant and a chelating agent, so that the stability and high efficiency of chlortetracycline hydrochloride soluble powder are ensured.

The invention provides a method for dissociating iron coordination polymer nanoparticles. The method comprises the steps that the iron coordination polymer nanoparticles are dissociated by a dissociation agent which is one or more selected from a group consisting of deferoxamine, deferiprone, ethylenediamine tetraacetic acid and ethylenediamine tetraacetic acid disodium salt. The iron coordinationpolymer nanoparticles are prepared from polyphenol, trivalent iron salt and macromoleclar polymer. The special dissociation agent is adopted to dissociate the iron coordination polymer nanoparticles.Under the action of the dissociation agent, the iron coordination polymer nanoparticles can be quickly dissociated into small nanoparticles or a small molecular solution. The dissociating method canquickly remove the iron coordination polymer nanoparticles in vivo and particularly the iron coordination polymer nanoparticles at the position of the liver, and reduce potential damage to the liver.

The invention belongs to the technical field of heavy metal detection and particularly relates to a method for detecting heavy metal content of food. The method comprises the following steps: freeze-drying a food sample, ashing, sieving, adding deionized water, citric acid and ethylene diamine tetraacetic acid, stirring, filtering, performing rotary evaporation concentration on the filtrate, determining the volume by using deionized water and detecting by a high performance liquid chromatographic instrument. To-be-detected liquid, which is obtained by a purification method of freeze-drying, ashing, adding the citric and the ethylene diamine tetraacetic acid and filtering, reduces the interference on the high performance liquid chromatographic instrument and can accurately detect the coppercontent, the lead content and the cadmium content of food.

The invention discloses stable and efficient chlortetracycline hydrochloride soluble powder for livestock and a preparation technology thereof. The powder mainly comprises the following raw materials in percentage by weight: 10-15 percent of chlortetracycline hydrochloride, 0.2-3.0 percent of lauryl sodium sulfate, 0.1-1.0 percent of ethylenediamine tetraacetic acid disodium and anhydrous dextrose in balancing amount. The raw materials are crushed and screened respectively, and then are fully and uniformly mixed by an equivalent incremental method. According to the powder, chlortetracycline hydrochloride is adopted as a raw material, lauryl sodium sulfate is added as an absorption promoter, and ethylenediamine tetraacetic acid disodium salt is added as an antioxidant and a chelating agent, so that the stability and high efficiency of the chlortetracycline hydrochloride soluble powder are guaranteed.

The invention discloses a novel pantoprazole sodium compound. The purity of the novel pantoprazole sodium compound reaches more than 99.8%. Meanwhile, the invention also discloses a pharmaceutical composition of the novel pantoprazole sodium compound. The pharmaceutical composition comprises the following components in parts by weight: 45-80 parts of pantoprazole sodium, 3-20 parts of ethylene diamine tetraacetic acid, 0.5-3 parts of sodium tartrate and 4-52 parts of mannitol. According to the pharmaceutical composition of the novel pantoprazole sodium compound, a synergistic effect is generated between ethylene diamine tetraacetic acid and sodium tartrate, so that the stability of pantoprazole sodium is remarkably improved, and the pharmaceutical composition has important significance for pantoprazole sodium in clinical popularization and application.

The invention belongs to the technical field of water treatment, and in particular relates to a method for removing cadmium in high salt wastewater of a metallurgy industry by chelation and coagulation combination. The cadmium in various forms in the high salt wastewater is difficultly removed effectively by the conventional single method, so that a combination method for removing a trace amount of cadmium in water by chelation and coagulation of inorganic polymer and ultrafiltration. The method comprises the following steps of: chelating the cadmium in various forms by using ethylene diaminetetraacetic acid disodium salt (EDTA disodium salt); coagulating chelates of the cadmium and the EDTA disodium salt by using polyaluminium chloride (PAC); and performing effective filtration treatment by using an ultrafiltration unit to effectively remove the trace amount of cadmium in the water. The method is mainly applied to advanced wastewater treatment in the metallurgy industry and can alsobe applied to the effective removal of high salt heavy metal from wastewater in other industries.

The invention provides high-sensitivity TMB (tetramethylbenzidine) color developing liquid and a preparation method thereof, aiming at the defects that color developing liquid adopting TMB (tetramethylbenzidine) as a color developing substrate in the market has the weakness that the sensitivity is low. The high-sensitivity TMB color developing liquid is characterized in that the concentration of each component is as follows: in color developing liquid A, the concentration of Tris is 12.11g / L, the concentration of potassium ferrocyanide is 1g / L, the concentration of sodium pyrophosphate is 5g / L, and the concentration of hydrogen peroxide is 1ml / L; in color developing liquid B, the concentration of NaH2PO4.2H2O is 2.96g / L, the concentration of Na2HPO4.12H2O is 29g / L, the concentration of TMB is 5g / L, the concentration of disodium edetate dihydrate is 1g / L to 2g / L, the concentration of dimethyl sulfoxide is 10mL / L, and the concentration of dodecyl dimethyl betaine is 0.1g / L to 1g / L. The high-sensitivity TMB color developing liquid has the beneficial effects that the sensitivity of detecting hepatitis c through euzymelinked immunosorbent assay is greatly improved, and the practicability is very important.

The present invention provides one kind of olefin polymerization inhibitor. The olefin polymerization inhibitor consists of dimethyl formamide 5-30 weight portions, amines 1-15 weight portions, 4-alkoxyl-2, 2, 6, 6-tetramethyl piperidyl nitroxide free radical 1-30 weight portions and water 30-90 weight portions. The preparation process includes A. preparing 4-alkoxyl-2, 2, 6, 6-tetramethyl piperidyl nitroxide free radical through mixing 2, 2, 6, 6-tetramethyl-4-alkoxyl piperidine, disodium editate, sodium carbonate and water in certain proportion, heating the mixture to 50-95 deg.c, adding 30-50 % concentration hydrogen peroxide solution and maintaining for 1-10 hr; B. adding diamine, alkyl amine or alkanolamine; and C. adding dimethyl formamide and water through mixing to obtain the product.

The invention discloses stable and efficient veterinary oxytetracycline hydrochloride soluble powder and a preparing technology thereof. The veterinary oxytetracycline hydrochloride soluble powder which is quick in absorption, efficient, stable and safe in using and the preparing technology of the veterinary oxytetracycline hydrochloride soluble powder are provided. The veterinary oxytetracycline hydrochloride soluble powder is composed of, by weight, 15-55% of oxytetracycline hydrochloride, 0.2-3.0% of sodium dodecyl sulfate salt, 0.1-1.0% of ethylenediamine tetraacetic acid disodium salt and the balance of glucosum anhydricum. According to the preparing technology of the stable and efficient veterinary oxytetracycline hydrochloride soluble powder, the oxytetracycline hydrochloride is used as raw materials, the sodium dodecyl sulfate salt is added to be used as a sorbefacient, the ethylenediamine tetraacetic acid disodium salt is used as antioxygen and a chelating agent, and accordingly the stability and the high efficiency of the oxytetracycline hydrochloride soluble powder are guaranteed.

The invention relates to a gelatinous heavy-duty cooking fume cleaning agent and a method for preparing the same. The gelatinous heavy-duty cooking fume cleaning agent is used for cleaning household and catering dining utensils such as range hoods, baking ovens, baking trays and pot bottoms. The gelatinous heavy-duty cooking fume cleaning agent comprises water, sodium hydroxide, sodium carbonate, ethylene diamine tetraacetic acid disodium, polyoxyethylene fatty alcohol sodium sulfate, sodium dodecyl benzene sulfonate and fatty alcohol-polyoxyethylene ether. The method includes 1, sufficiently dissolving the sodium hydroxide, the sodium carbonate and the ethylene diamine tetraacetic acid disodium in the water to obtain solution, heating the solution until the temperature of the solution reaches 55 DEG C approximately and then adding the sodium dodecyl benzene sulfonate and the polyoxyethylene fatty alcohol sodium sulfate into the solution; sufficiently dissolving the sodium dodecyl benzene sulfonate, the polyoxyethylene fatty alcohol sodium sulfate and the solution to obtain second solution, reducing the temperature of the second solution until the temperature of the second solution reaches the normal temperature, then adding the fatty alcohol-polyoxyethylene ether into the second solution and stirring the fatty alcohol-polyoxyethylene ether and the second solution until the fatty alcohol-polyoxyethylene ether is sufficiently dissolved. The gelatinous heavy-duty cooking fume cleaning agent and the method have the advantages that the gelatinous heavy-duty cooking fume cleaning agent is high in cleaning power and suitable for removing heavy oil dirt; the gelatinous heavy-duty cooking fume cleaning agent is gelatinous and can be sprayed at positions with the heavy oil dirt without liquid dropping, is free of irritation on human bodies and is safe for the human bodies; the gelatinous heavy-duty cooking fume cleaning agent is free of toxicity and low in irritation and is green and environmentally friendly; technologies and processes for producing the gelatinous heavy-duty cooking fume cleaning agent are simple, convenient, safe and speedy.

The invention discloses glaze with an anti-bacterial function and an application of the glaze in a ceramic valve element of a faucet. The glaze is prepared by mixing raw materials in parts by weight as follows: 13-15 parts of albite, 23-26 parts of potassium feldspar, 1-3 parts of talc, 10-13 parts of calcite, 4-6 parts of diatomite, 3-5 parts of calcium carbonate, 1-3 parts of zinc oxide, 28-32 parts of quartz, 1-3 parts of dolomite, 3-5 parts of kaolin, 1.5-2.5 parts of calcium salt, 0.5-1.5 parts of silver nitrate and 3-5 parts of ethylene diamine tetraacetic acid disodium salt. The glaze has the anti-bacterial function, with the adoption of ethylene diamine tetraacetic acid disodium salt, loss of Ag+ can be reduced, a long-term slow release function is performed, a long-term anti-bacterial function can be performed, and the quality of drinking water is improved. Materials of the ceramic valve element of the faucet are simple and easy to obtain, the ceramic valve element can be produced with a conventional ceramic preparation method, the cost is low, and the anti-bacterial means is more economical, simpler and more convenient than other anti-bacterial means.

The invention discloses a low corrosiveness cleaning agent used for boilers. The low corrosiveness cleaning agent is composed of, by mass, 5 to 12 parts of ethylenediamine tetraacetic acid disodium salt, 0.02 to 0.05 part of polyoxyethylene octylphenol ether, 2 to 3 parts of polyacrylic acid, 5 to 10 parts of citric acid, 0.5 to 1 part of hydrogen peroxide, 0.01 to 0.05 part of ammonium thiocyanate, 0.1 to 0.3 part of urotropin, 0.04 to 0.1 part of thiourea, 0.05 to 0.1 part of benzyldimethylhexadecylammonium chloride, 0.05 to 0.1 part of sodium dodecyl benzene sulfonate, and pure water. The invention also provideds a preparation method of the low corrosiveness cleaning agent used for boilers, according to the preparation method, the low corrosiveness cleaning agent is obtained by putting the above ten ingredients into a stirred vessel at the mass ratio successively for stirring dissolving. The ten ingredients are combined at the mass ratio above, cleaning effect and corrosion inhibition effect on boilers are better than that exclusive use of any one of the ingredients, toxicity is low, environmental harm is less, and the low corrosiveness cleaning agent is capable of according with the requirements of sustainable development. The preparation method is simple; the raw materials are easily available; and operation is convenient.

The invention relates to a water-based normal-temperature rust-removal rust-proof liquid, which is prepared from the following active ingredients in parts by weight: 1-2 parts of zinc oxide, 2-3 parts of manganese dioxide, 2-3 parts of citric acid, 22-24 parts of E-12 epoxy resin, 6-8 parts of sodium hexametaphosphate, 1-2 parts of dimethyl formamide, 2-3 parts of catechol, 1-2 parts of sodium dodecyl benzene sulfonate, 13-15 parts of bisphenol A epoxy acrylate, 1-2 parts of disodium edetate dihydrate, 4-5 parts of auxiliaries and 300 parts of water. The rust-proof liquid can fast remove oil and rust at normal temperature, and can be corrosion-resistant and antibacterial, a thin film can be formed on a metal surface by using organic polymer resin and a chelating agent so as to isolate air and achieve the oxidization prevention effect, and the corrosion-inhibition and rust-proof effects are better, the thin film is easy to remove with water, thus being energy-saving and environment-friendly.

The invention relates to the technical field of retarders for concrete, in particular to a composite retarder for concrete. The retarder is prepared from, by weight, 20-45 parts of polymers, 5-12 parts of phosphate retarder, 1-4 parts of diphosphonic acid, 3-12 parts of bentonite, 2-8 parts of gypsum, 3-5 parts of disodium edetate dihydrate, 2-8 parts of polyether polyol, 5-10 parts of anhydride with the carbon atom number of 4-8, 3-8 parts of organic amine, 1-5 parts of catalyst, 1-3 parts of formaldehyde, 2-4 parts of sodium borate, 4-8 parts of calcium sulfate, 4-6 parts of water reducing agent, 1-3 parts of dispersing agent and 0.4-0.8 part of surfactant. According to the composite retarder for the concrete, cement can be wrapped and prevented from being coagulated too early, the lossrate of cement strength is lowered, and the coagulation speed of the concrete is lowered.

The invention belongs to the field of collagen peptides, and relates to a bovine bone collagen peptide and a production method thereof, the production method comprises the following steps: (1) pretreating raw materials; (2) purifying the raw materials; (3) shaking and extracting an acetic acid solution; (4) performing primary enzymolysis; (5) performing secondary enzymolysis; (6) filtering with activated carbon; (7) filtering with an inorganic nanofiltration ceramic membrane; (8) concentrating; and (9) performing spray drying. The collagen peptide is prepared by fully utilizing bovine bone which is a bovine processing byproduct, the cost is low, and the collagen extraction rate is greater than 85%; the prepared yak bone collagen oligopeptide is white or faint yellow powder, the purity is greater than 90%, the molecular weight is less than 1000Da, and the yak bone collagen oligopeptide has no peculiar smell; after bovine bones are prepared into bone meal, non-collagen substances, fat and calcium in bovine bone paste can be basically separated and removed through purification of a NaOH solution, a normal hexane solution and an ethylenediamine tetraacetic acid disodium salt concentrated solution, and the prepared bioactive peptide product is not sticky and basically does not contain impurities such as fat and cholesterol.

The invention aims to provide a reagent and method for rapidly measuring the ammonia nitrogen content of oil refining sewage through an electrode method. The method is rapid and efficient, and the operation is quick and efficient. The reagent is composed of a standard solution and a buffer solution. The standard solution is an ammonium chloride solution. The buffer solution is a mixed solution of sodium hydroxide, sodium potassium tartrate tetrahydrate, and EDTA (Ethylene Diamine Tetraacetic Acid), wherein the mass percentage of sodium hydroxide: sodium potassium tartrate tetrahydrate: EDTA is 40-200: 28.2-141: 7.44-74.4. During the measuring process, sodium hydroxide in the buffer solution is used to adjust the pH value of a water sample until the pH value of the water sample reaches more than 11; sodium potassium tartrate tetrahydrate and EDTA can eliminate the interference of multiple metal ions such as aluminum, zinc, cadmium, copper, iron, and the like; and thus the reagent is very suitable for measuring the ammonia nitrogen content of oil refining sewage.