169 results about "Metal Chelating Agents" patented technology

The invention relates to the technical field of bamboo pulp bleaching, and particularly discloses a method for preparing all-chlorine-free bleached bamboo pulp and application. The method adopts a three-section enhanced bleaching process and comprises the following steps: firstly, decomposing lignin under an alkaline condition of 100-115 DEG C through oxygen delignification (Op section); removing transition metal ions by using sulfuric acid and a metal chelating agent with a specific structure by adopting acid pickling chelation (AQ section); and finally, deeply oxidizing the residual lignin in a high-pressure oxygen environment through oxygen enhanced bleaching (Po section). In each stage, hydrogen peroxide is used as a main bleaching agent, sodium hydroxide, sodium silicate and other assistants are matched, and ineffective decomposition of hydrogen peroxide is effectively inhibited through staged pH regulation and a metal chelation technology. The whiteness of the obtained bamboo pulp is larger than or equal to 83% ISO, the kappa number is smaller than or equal to 3.0, and the requirements of high-grade paper products are completely met.

The invention discloses an interlayer AlN3 monatomic site anchored carbon nitride nanotube photocatalyst as well as a preparation method and application thereof, and belongs to the field of photocatalysis. The preparation method of the photocatalyst for catalyzing water and oxygen to be converted into hydrogen peroxide comprises the following steps: (1) by taking melamine, soluble aluminum salt and a metal chelating agent as raw materials, carrying out supramolecular self-assembly reaction by adopting a hydrothermal method to generate a carbon nitride nanorod precursor; and (2) roasting the carbon nitride nanorod precursor to obtain the photocatalyst. According to the photocatalyst prepared by the method disclosed by the invention, Al atoms are connected between carbon nitride layers, so that the transfer distance of carriers from the inside to the outside can be shortened, and the carrier separation efficiency is improved; the valence band position of the photocatalyst is high, and holes in the valence band have enough energy to directly oxidize water, so that the catalytic performance is greatly improved.

The invention discloses a preparation method of a catalyst for catalyzing directional polycondensation of acetone to synthesize mesitylene, and belongs to the technical field of catalysis. The modified active metal supported catalyst is prepared from a catalyst carrier prepared by mixing a nitrogen-doped modified carbon carrier or a composite oxide with a molecular sieve, an active metal component, a metal modification additive component and a metal chelating agent. According to the present invention, the active component is loaded on the composite modified carrier through the isovolumetric impregnation method, and the metal modification auxiliary agent component is introduced through the ion exchange method to further modify the active component, such that the requirement of the catalysis of the directional deoxidation trimerization of the acetone to prepare the mesitylene is achieved, and the catalyst prepared by the method has advantages of low price, high activity, high selectivity, good stability and the like; the problem that the separation cost is increased due to the complex equipment requirement and the separation problem of mesitylene and methyl-ethylbenzene under the similar boiling point in the traditional mesitylene production method is avoided.

Laundry additive compositions that include a metal sequestration agent and that may be characterized by an acidic pH. Related methods of treating a fabric, for example with a wash liquor and a rinse liquor, with such compositions and / or agents. Uses of such laundry additive compositions.

The inhalation suspension preparation containing the SGC receptor stimulant comprises the SGC receptor stimulant with an effective therapeutic dose or pharmaceutically acceptable salt of the SGC receptor stimulant, and pharmaceutically acceptable auxiliary materials of the suspension preparation, the pharmaceutically acceptable auxiliary materials of the suspension preparation comprise at least one of a surfactant, a pH regulator, an osmotic pressure regulator and a metal complexing agent; the inhalation suspension preparation containing the riociguat shows good lung absorption efficiency, is beneficial to reaching the same or better treatment level by reducing the administration dosage, can directly act on a diseased region through an administration route, takes effect more quickly compared with oral administration of the riociguat, and has a good application prospect. Gastrointestinal discomfort and systemic hypotension side effects caused by gastrointestinal tract contact and absorption entering a circulatory system can be avoided, the treatment cycle of an oral dosage form dosage titration administration scheme is shortened, and a better treatment scheme is provided for relieving dyspnea and syncope symptoms of pulmonary hypertension patients treated at home.

The present invention belongs to the technical field of the synthesis of industrial high-molecular adhesives, and discloses a high-temperature resistant anaerobic adhesive with a functionalized cage-shaped silsesquioxane structure, a preparation method thereof and an application. The high-temperature resistant anaerobic adhesive is composed of the following components in parts by weight: 2-40 parts of methacryloxypropyl cage-shaped silsesquioxane, 50-100 parts of methacrylate monomer, 0.1-10 parts of inhibitor, 0.1-10 parts of metal chelating agent, 1-20 parts of initiator, 0.5-10 parts of accelerator, and 1-5 parts of auxiliary material. The present invention can prepare a high-purity functionalized cage-shaped silsesquioxane, and by adding the functionalized cage-shaped silsesquioxane, the crosslinking density of the anaerobic adhesive is increased, and the heat resistance is improved, so as to synthesize a high-temperature resistant anaerobic adhesive with a functionalized cage-shaped silsesquioxane structure, and the high temperature resistance can reach 350 °C, which can meet the requirements of industry for anaerobic adhesives in high-temperature environments.

The invention belongs to the field of daily chemicals, and particularly relates to a body cleaning composition containing folium artemisiae argyi extract and a preparation method of the body cleaning composition. 14%-20% of a surfactant; 0.5-5% of a skin conditioner; 0.01%-0.1% of a metal chelating agent; 0.01%-1.2% of a preservative; 0.01%-1% of a pH regulator; 1 to 1.5 percent of flavoring agent; 0.01%-1% of a viscosity modifier; and the balance of deionized water. The plant functional composition comprises a folium artemisiae argyi extract and a rosa canina fruit extract. The folium artemisiae argyi extract and the rosa canina fruit extract in the composition can achieve a synergistic effect, free radicals can be effectively removed, release of cell factors and inflammatory mediators can be inhibited, and the composition has anti-inflammatory and soothing effects, can relieve uncomfortable symptoms such as skin redness and itching and has a certain whitening effect.

A compound comprising a prostate specific membrane antigen (PSMA)-targeting moiety of the following formula (I) or of a salt or a solvate thereof. R1 is —R1aR1b— wherein R1a is absent, —CH2—, —O—, or —S—, and R1b is —CH2— or —CHF—. R2 is —(CH2)3—O—, —(CH2)3—, —(CH2)4—, —CH2—O—(CH2)2—, or —CH2—S—(CH2)2. R3 is ethylene fused to a tricyclic fused ring. L1, L2, L3, L4, L5b L5c, L6 and L7 are linkages (e.g. peptide bonds). Xbr is a branching atom. Rrad is a radiometal chelator. Ralb is an albumin binder. n1, n2, n3, n4, and n5 are integers. When the PSMA-targeting moiety is linked to a radiolabeling group, the compound may be used as an imaging agent or therapeutic agent for PSMA-expressing diseases / conditions.

The invention discloses an inflorescence gene silencing method which comprises the following steps: firstly, synthesizing a specific nucleotide fragment according to a target gene, and constructing the specific nucleotide fragment to a plant virus vector; introducing the constructed plant virus vector and the corresponding helper plasmid into the inflorescence; soaking the inflorescence in a metal chelating agent salt solution; and finally, screening to obtain plants with inflorescences subjected to target gene silencing. The chrysanthemum capitulum is selected as an infection object, the silencing method is optimized, the target gene silencing efficiency is remarkably improved, the phenotype detection period after infection is remarkably shortened, and the method is efficient, convenient and high in operability. Meanwhile, the method can effectively avoid the cross protection phenomenon of plants, overcomes the obstacle of limited transmission range of viral vectors, does not need to consider the problems of death and growth cycle of tissue culture seedlings or seedlings after infection, and provides a feasible means for rapid identification of chrysanthemum gene functions and large-scale development of chrysanthemum gene function research.

The application discloses a preparation method of a thermal gradient self-adaptive hybrid modified retarder, and the method comprises the following steps: dissolving a metal chelating agent monomer and a hydroxide into water and stirring to obtain a first solution; adding an organic small molecule into the first solution to react and obtain a second solution; adding a reaction agent dropwise into the second solution to react and obtain a third solution; and filtering the third solution to obtain the retarder. The thickening time of the cement slurry added with the retarder can meet the construction requirements of high temperature and high pressure, and the cement slurry still has good early strength and other characteristics under the condition of lower temperature, so that the purpose of temperature self-adaptation is achieved, and the construction safety and quality of the ultra-deep well cementing are ensured.

A method for inhibiting or preventing polymerization of a polymerization composition comprises: adding at least one inhibitor(s) to the polymerization composition to stabilize and inhibit the polymerization of the polymerization composition, wherein the polymerization composition contains disilacyclobutane monomers, wherein the inhibitor is selected from amine compounds, quaternary ammonium salts or metal chelating agents.

Disclosed herein is method for conjugating a metal chelating agent to a functionalized dextran by reacting a chelator with an aminated dextran backbone, where the chelator comprises a one, and only one, derivatized carboxylic acid group to form a chelator-dextran complex. In certain aspects, the dextran-chelator complex is substantially free of intra- or intermolecular crosslinking. In certain aspects, the functionalized dextran is an amine dextran, an alkynyl dextran, or a thiol dextran. In exemplary implementations, the functionalized dextran is an amine dextran. In further embodiments, one and only one carboxylic acid group on the chelating agent is derivatized as a N-hydroxysuccinimide (NHS) ester.

The present invention relates to the field of preparation of metal extractants, and particularly to a metal extractant microcapsule and a preparation method thereof. The preparation method of the metal extractant microcapsule in the present invention comprises the following preparation steps: (1) Ethyl acrylate, methacrylamide, 2-acrylamido-2-methylpropanesulfonic acid sodium salt, a crosslinking agent, and an initiator are mixed evenly, and an emulsifier solution is added dropwise under stirring conditions, followed by ultrasonic treatment. After irradiating with ultraviolet light for 10-20 min under stirring conditions, it is washed with pure water, separated, and dried to obtain hollow microcapsules; (2) The hollow microcapsules obtained in step (1) are evacuated, a metal chelating agent is added, and ultrasonic treatment is carried out for 5-10 h, followed by filtration and washing to obtain metal extractant microcapsules. The preparation process of the metal extractant microcapsule is simple and easy to operate, has a good encapsulation rate for the metal chelating agent, and has a high removal effect on various metal ions.

The application discloses a low-temperature rapid curing epoxy adhesive and a preparation method thereof. A component A is composed of an epoxy resin, a diluent and a filler, is uniformly stirred and mixed, and is vacuum degassed to obtain the component A; a component B is composed of a flow agent, a tertiary amine accelerator, a free radical scavenger, a chelating agent and a filler, the thiol, the chelating agent, the filler and the free radical scavenger are uniformly stirred, are slowly stirred and matured for at least 24 hours after passing through a three-roller machine, and then the tertiary amine accelerator is added, and the component B is vacuum degassed to obtain the component B. The thiol and the tertiary amine accelerator are used in combination, the curing speed is the fastest at room temperature, and the gel time of 60s / 25g can be achieved; the metal chelating agent and the free radical scavenger are combined to prevent the thiol from being skinned during storage, and the stable storage time is more than 6 months without skinning. The maturation of the component B enables the chelating agent to fully act on metal ions in the filler, and reduces the influence of the chelating agent on the promoting effect of the tertiary amine accelerator.

The present disclosure relates to a method of inhibiting nuclease activity in a biological sample. In accordance with certain embodiments of the present disclosure, the method comprises mixing a biological sample with a metal-chelating agent complex. The present disclosure also discloses a method of isolating a cell nucleus from a cell in a biological sample by using the metal-chelating agent complex, and a method of adding a deoxyribonucleotide to the 3'terminal of a deoxyribonucleic acid.

The invention relates to a cleaning agent and a preparation method thereof, the cleaning agent comprises bioactive hydrolase, polyol, a metal chelating agent, an alkaline pH regulator, a nonionic surfactant and water, and the polyol contains at least four hydroxyl groups. A dense hydrogen bond network and a space wrapping effect are formed by a polyhydroxy structure of polyhydric alcohol and enzyme molecules, so that the stability of enzyme in an alkaline environment and a high-temperature condition is remarkably improved, and the applicable temperature and pH range of the cleaning agent is greatly widened due to the characteristic; the problem that the use condition of a traditional enzymatic cleaning agent is limited due to the fact that enzyme is prone to inactivation is solved.

A method and gel buffer for capillary electrophoresis (CE) separation of proteins. The gel buffer solution comprises a buffer component, a hydrophilic polymer, an organic additive, a detergent and a metal chelating agent. By adopting a gel buffer solution, the separation degree of a main peak and an acromion can be improved when protein is separated by capillary electrophoresis (CE).

The invention belongs to the technical field of refined cotton production processes, and particularly relates to a cooking aid for controlling cotton linter cooking polymerization reduction and a production process. The cooking auxiliary agent is prepared from the following components in percentage by mass: 0.35%-1.1% of magnesium chloride, 61.2%-87.7% of a reducing agent and 11.8%-37.7% of a metal chelating agent, totaling 100%. By means of the synergistic effect of the cooking auxiliaries, disordered degradation of cellulose can be effectively blocked in the cotton linter cooking process, the polymerization degree of alkalized cotton is greatly improved, and the polymerization degree can stably reach 3,250 DP or above; the purpose of removing impurities can be achieved; therefore, a guarantee can be provided for obtaining refined cotton with qualified impurity indexes and higher polymerization degree.

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 invention discloses a hydrogen-embrittlement-resistant precise mask plate electrolytic cleaning agent for an OLED (Organic Light Emitting Diode) and a preparation method thereof, and the hydrogen-embrittlement-resistant precise mask plate electrolytic cleaning agent comprises the following components in percentage by mass: 5-10% of KOH, 0.1-0.5% of an alkali-resistant organic metal chelating agent, 0.1-1.0% of an inorganic chelating agent, 0.01-0.2% of an ampholytic surfactant and the balance of water. According to the cleaning agent, the problem of hydrogen embrittlement in the electrolytic cleaning process of the invar alloy precise mask plate is solved in a targeted manner, and the quality and reliability of the mask plate are improved. And secondly, the added reagent has good chemical stability and environmental friendliness, and does not cause adverse effects on the subsequent processing technology and environment. In addition, the method is low in cost, and considerable economic benefits are brought to the OLED manufacturing industry.

The application discloses a heavy metal chelating agent and a preparation method thereof. The heavy metal chelating agent is obtained by controlling the synthesis of melamine formaldehyde resin prepolymer and introducing a dithiocarbamate salt group with a chelating function into the structure of the melamine formaldehyde resin prepolymer. The heavy metal chelating agent has the characteristics of high efficiency and stability, high heavy metal removal rate, fast settling speed of chelation products, low leaching, and low cost, and is suitable for industrialized treatment of heavy metal pollution in fly ash and industrial wastewater.

The invention relates to the field of cell preservation solutions, and provides a cell preservation solution, an erythrocyte simulant and a preparation method and application of the erythrocyte simulant. The cell preservation solution comprises a polyphenol compound, a buffer system, a metal chelating agent, a nutrient substance, a metabolism regulator, mannitol, poloxamer and an optional preservative. The preparation method of the red blood cell simulant comprises the following steps: taking mammal venous blood and purifying to obtain red blood cells; fixing the obtained red blood cells by using a fixing agent; and dispersing the red blood cells obtained by immobilization treatment in the cell preserving fluid provided by the invention. The cell preserving fluid is beneficial for improving the stability of red blood cells and enabling the red blood cells to maintain good uniformity; the red blood cells in the red blood cell simulant have good bottle opening stability, thermal stability and long-term stability, the variable coefficient of the red blood cells is low, and the product batch-to-batch repeatability is good.

A polymer breaking solution usable in fracking and other downhole applications comprises a solution of aqueous hydrogen peroxide, an anionic surfactant, a metal chelating agent, an acidic pH buffer, a soluble zinc compound, and in some embodiments, a viscosifying agent. In other embodiments, the solution may additionally comprise a linear hydrophobic surfactant. At treatment concentrations of between 500 ppm to 1,500 ppm, the solution is non-toxic and usable at a wide range of downhole temperatures (32° C. to 82° C.).

The present invention provides a cleaning agent composition for hard surfaces that exhibits excellent sustained effectiveness in suppressing the occurrence of urine scale stains and yellow stains derived from urine on hard surfaces, and a method for cleaning hard surfaces using the same. [Solution] A cleaning agent composition for hard surfaces, comprising the following components (a), (b), (c), and water, wherein the mass ratio (c) / [(a)+(b)] of the content of component (c) to the total content of components (a) and (b) is 0.005 or more and 0.3 or less. (a) Ingredients: Metal chelating agent (b) Component: Foaming surfactant (c) Component: Water-soluble polymer

The invention relates to a preparation method of a high-yellowing-resistance self-cleaning TPU (thermoplastic polyurethane) film, which comprises the following steps: mixing polyether glycol with nano silicon dioxide which accounts for 1-5% of the total weight of a base material; adding a solvent of ethanol or methanol, wherein the dosage of the solvent is 150-300% of the weight of the base material; stirring for 30-60 minutes at room temperature to form uniform dispersion liquid; adding a metal chelating agent solution containing EDTA (Ethylene Diamine Tetraacetic Acid) into the dispersion liquid, wherein the dosage is 0.2-1% of the total weight of the dispersion liquid; an anti-yellowing agent comprising anti-UV-385 and anti-UV-328 is added into the solution, the total amount of the anti-yellowing agent is 2%-5% of the weight of the solution, and the anti-yellowing agent is added after being mixed according to the proportion of 1: 1 or 1: 2; the base material solution is added into a reaction kettle, isocyanate containing MDI is slowly added, and the use amount of the isocyanate is 40%-60% of the total weight of the base material; adding a chain extender which accounts for 10%-20% of the total weight of the base material, and adding a catalyst; adding activated titanium dioxide nano-particles into the prepolymer, wherein the use amount of the activated titanium dioxide nano-particles is 0.5%-2% of the total weight; the activation method adopts plasma treatment.

The invention relates to the technical field of soil heavy metal remediation, in particular to a humic acid slow-release fertilizer for improving the remediation efficiency of barbadosnut on cadmium-contaminated soil and a preparation method of the humic acid slow-release fertilizer. The fertilizer specifically comprises the following components: polyvinyl alcohol, span 80, urea, calcium hydrophosphate, potassium sulfate, magnesium oxide, humic acid, DA-6, IAA, IBA, EGTA, corn straw compost and the like. The humic acid slow-release fertilizer and the application method thereof, provided by the invention, have remarkable beneficial effects in the aspect of improving the remediation efficiency of the barbadosnut on the cadmium-polluted soil. According to the slow-release fertilizer, humic acid, plant hormones, a metal chelating agent and nutrient elements are scientifically proportioned, and corn straw compost is combined as an organic carrier, so that slow release and efficient utilization of nutrients are realized. The high-activity extraction process of humic acid ensures the strong complexing ability of rich functional groups and heavy metals, and significantly enhances the cadmium absorption and transport ability of jatropha curcas.

The invention discloses an experimental kit for chloroplast pigment extraction and separation and application, and belongs to the technical field of photosynthetic pigment extraction and separation, a surfactant and EDTA sodium are added during extraction, and an efficient aluminum foil silica gel thin layer and a composite chromatographic solution are adopted during separation; the chromatography medium is an efficient silica gel thin layer. In the process of extracting and separating the photosynthetic pigment, a surfactant and an EDTA (Ethylene Diamine Tetraacetic Acid) sodium metal chelating agent are added, the ratio of a chromatography medium to a chromatography liquid is optimized, a filtering and chromatography device is simplified, the extraction rate and the separation degree of the pigment are remarkably improved, the operation is simpler and safer, and finally 6-8 kinds of the photosynthetic pigment can be separated from fresh spinach leaves. 13 chloroplast pigments are separated from the leaf dry powder.

The invention discloses a composite inhibitor composed of a metal chelating agent and a free radical scavenger and application of the composite inhibitor in inhibition of degradation of an amine absorbent in CO2 capture, and belongs to the field of CO2 capture after combustion. The composite inhibitor is composed of a metal chelating agent and a free radical scavenger, the metal chelating agent refers to diethylene triamine penta (methylene phosphonic acid) (DTPMP) or diethyl triamine pentaacetic acid (DTPA), and the free radical scavenger refers to potassium iodide (KI) or sodium thiosulfate (Na2S2O3). The mass fraction of the metal chelating agent in the composite inhibitor is 10-90%, and the mass fraction of the composite inhibitor added into the amine absorbent is 0.1-1.0%. The composite inhibitor disclosed by the invention can be used for remarkably inhibiting degradation of an alcohol amine absorbent in the field of CO2 capture, and has the characteristics of strong inhibition effect, low price, good stability and high solubility. In addition, through the synergistic inhibition effect between the metal chelating agent and the free radical scavenger in the composite inhibitor, the usage amount of the composite inhibitor can be greatly reduced, and the cost of the inhibitor is reduced.

The present invention relates to the technical field of nanosilver preparation and discloses a method for preparing nanosilver. The method comprises providing a base liquid containing nanosilver particle seed crystals, a dispersant, a gel material, and a solubilizing agent; adding a silver salt solution and a reducing agent solution to the base liquid in parallel, wherein the silver ions are reduced to elemental silver during the addition process; after the silver salt solution is added, a metal chelating agent is added to the reaction system for a full reaction; after the reaction, a slurry is obtained, and solid nanosilver is extracted from the slurry; the solubilizing agent is selected from at least one of sodium oleate, polysorbate 80, and propylene glycol. This method reduces the difficulty of separating and purifying the obtained nanosilver; and the entire preparation process is simple. The obtained nanosilver has a particle size between 200 and 500 nm and good monodispersity, and has broad application prospects in the field of conductive pastes.

The application discloses a substation oil-filled equipment live extinguishing medium, and the mass concentration ratio of raw materials of the extinguishing medium is as follows: 5-35% of ethylene glycol, 5-20% of non-ionic foaming emulsifier, 3-8% of ethylene glycol butyl ether, 2-5% of non-ionic film-forming spreading agent, 0.2-0.6% of xanthan gum, 0.15-0.5% of non-ionic organic corrosion inhibitor and 0.5-1.5% of metal chelating agent, and the rest is deionized water with conductivity lower than 10 mu s / cm. The product formula uses non-ionic raw materials, and after being mixed with water in a proportion, the conductivity is lower than 200 mu s / cm. The conductivity of the extinguishing agent is prevented from being improved under long-term storage by adding a corrosion inhibitor / chelating agent compound, and the extinguishing agent can be used in combination with a water quality monitoring and processing device to realize spraying and extinguishing for live equipment within the effective period of the extinguishing agent. The extinguishing medium uses a new type of fluorosilicon / fluoroether structure film-forming agent, which can be naturally degraded in the environment on the basis of ensuring hydrophobicity, oleophobicity, film forming and spreading. Meanwhile, by adding a new type of high-efficiency cooling and emulsifying aid, the ability of the product to quickly extinguish and prevent re-ignition is ensured.