3917 results about "Organic acid" patented technology

A forest fire retardant composition contains a retardant compound that includes a potassium salt. The potassium salt may include a potassium salt of an organic acid, a potassium salt of an inorganic acid, or mixtures thereof. The organic acid may include formic acid, acetic acid, propanoic acid, butanoic acid, lactic acid, oxalic acid, malic acid, gluconic acid, tartaric acid, uric acid, malic acid, or citric acid. The inorganic acid may include sulfuric acid, phosphoric acid, carbonic acid, or hydrochloric acid. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention relates to the technical field of additives for concrete, and particularly discloses a waterproof synergistic interface agent, an interface permeation type water reducing agent mother solution, an interface permeation type water reducing agent and a preparation method of the interface permeation type water reducing agent. The waterproof synergistic interface agent is prepared from the following raw materials: organic acid modified nano inorganic powder and polyhydroxy acrylate. Through the design of the raw materials of the waterproof synergistic interface agent, the surface active groups, the adsorption performance and the dispersity of the nano inorganic powder are increased, the grafting degree of polyhydroxy acrylate with other large monomers, small monomers and functional monomers is improved, the polyhydroxy acrylate is grafted or dispersed in a water reducing agent mother solution through a polymerization reaction, and the waterproof synergistic interface agent is prepared. By combining the synergistic anti-seepage filling effect of the nano inorganic powder, the internal phase interface structure of the concrete is improved, the adhesiveness of different interfaces and the binding force of new and old concrete interfaces are increased, and the hydration hardening product can improve the compactness and toughness of the concrete and improve the ion penetration resistance and mechanical property of the concrete; the problem that an existing water reducing agent is single in function is solved.

The invention relates to a copper-molybdenum-titanium etching solution as well as a preparation method and application thereof. The copper-molybdenum-titanium etching solution comprises a main agent, the main agent is prepared from organic acid, a fluorine-containing compound, a surfactant, organic alkali, a corrosion inhibitor, hydrogen peroxide and deionized water. The copper-molybdenum-titanium etching solution provided by the invention does not contain phosphorus, the cost and environmental protection risk in a wastewater treatment link are greatly reduced, and meanwhile, the copper-molybdenum-titanium etching solution contains low fluorine, so that the etching solution has good etching activity, corrosion to equipment is effectively reduced, a powerful guarantee is provided for stable operation of production, and the copper-molybdenum-titanium etching solution is suitable for industrial production. And meanwhile, the safety of an operation environment is improved. Especially, under the condition of low hydrogen peroxide content, the copper-molybdenum-titanium etching solution shows excellent etching performance. In addition, the etching solution also has long copper service life, can effectively inhibit the negative influence of copper ions on the etching performance, prolongs the effective service time of the etching solution in a high copper content state, greatly reduces the replacement frequency of the etching solution, reduces the production cost, and improves the production efficiency.

The invention provides a composition with oil-controlling, acne-removing, barrier-repairing effects and application thereof, and belongs to the field of cosmetics. The composition is prepared from a baropetalum beetle leaf extract, a roselle flower extract, totarol and a cryptomeria fortunei bud extract. The baropetalum chinense leaf extract has the effects of balancing grease secretion and shrinking pores; the roselle flower extract is rich in organic acid and anthocyanin, and has the effects of dissolving pore keratosuppository, controlling oil, resisting inflammation, smoothing acne skin, preserving moisture and removing redness; as a bacteriostatic agent, totarol has a natural preservative effect on gram-positive bacteria and partial negative bacteria, and has the effects of removing acnes, sterilizing, diminishing inflammation, whitening and the like; the cryptomeria fortunei bud extract can promote skin tissue structure regeneration and strengthen skin barriers. The composition effectively regulates and controls excessive secretion of sebaceous gland grease and pox skin specific protein through the synergistic effect of various components, promotes the health of pox skin, repairs the skin barrier and enhances the self-protection ability of the skin at the same time.

The invention belongs to the technical field of rare and precious metal recovery, and particularly relates to a method for recovering metallic silver from waste crystalline silicon battery pieces, which comprises the following steps: (1) putting the waste crystalline silicon battery pieces into an inorganic alkali aqueous solution for soaking reaction to obtain an aluminum-containing solution and dealuminized crystalline silicon pieces; (2) adding the dealuminized crystal silicon wafer into a mixed solution of organic acid and hydrogen peroxide for soaking reaction, filtering and washing to respectively obtain silver-containing filtrate and a silver-removed silicon wafer; (3) carrying out chlorination precipitation reaction on the silver-containing filtrate and a chlorine source, filtering and drying to obtain silver chloride powder; (4) adding silver chloride powder into an ammonia water solution, heating and stirring to completely dissolve silver chloride to obtain a silver-ammonia solution; (5) adding PVP (Polyvinyl Pyrrolidone) into the silver-ammonia solution, heating and stirring until the PVP is completely dissolved, adding ascorbic acid, and carrying out reduction reaction at room temperature to obtain metal silver powder precipitate; and filtering, washing and drying the precipitate to obtain the spherical silver powder. According to the method, the silver recovery efficiency is high, the spherical nanoscale silver powder can be prepared, and the purity is high.

The invention relates to the technical field of retired ternary power battery recovery, and particularly discloses a method for preferentially extracting lithium and recovering valuable metals from a retired ternary lithium battery and application of the method. According to the method, the traditional process is broken through the preferential lithium extraction, and efficient recovery of lithium, Ni, Co and Mn is realized by utilizing'fast-medium-slow 'multi-stage cooperation of a composite reducing agent and accurate adaptation of roasting and leaching parameters, so that the method has the advantages of low cost, high efficiency, low energy consumption and the like, and is suitable for large-scale industrial production. The method is low in energy consumption and environment-friendly, and is applied to resource recycling of the retired ternary lithium battery, and the precursor can be used for reproducing a positive electrode material or used for a catalytic material.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the sphere-like cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 8-10, and carrying out sol-gel reaction to obtain sphere-like cerium dioxide sol; and (3) carrying out post-treatment on the sphere-like cerium dioxide sol to obtain the sphere-like cerium dioxide. According to the preparation method of the sphere-like cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the sphere-like cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

Provided is a flux that can suppress the generation of voids when an indium alloy sheet is used to perform a continuous reflow under different temperature conditions. The present invention employs a flux that contains a rosin ester, an organic acid (A), and a solvent (S). The organic acid (A) includes a dimer acid (A1) that demonstrates a weight reduction rate of not more than 1 mass % in a thermogravimetric analysis in which the dimer acid is heated up to 260° C. at a temperature rising rate of 10° C. / min. The solvent (S) includes a solvent (S1) that demonstrates the weight reduction rate of at least 99 mass % in a thermogravimetric analysis in which the solvent (S1) is heated up to 150° C. at a temperature rising rate of 6° C. / min.

The invention belongs to the field of waste artificial graphite regeneration, and particularly relates to a waste artificial graphite regeneration method, a regenerated material and application thereof, the regeneration method comprises the following steps: carrying out normal pressure liquid phase modification on waste artificial graphite in an organic acid solution in advance, and then putting the modified waste artificial graphite in an inorganic acid solution for positive pressure liquid phase modification to prepare a modified material; mixing the modified material with a Mn source, a metal N source, a first carbon source and a binder to obtain a mixture, then performing heat treatment on the mixture in a hydrogen-containing atmosphere, and then performing negative-pressure annealing treatment to obtain a heat-treated material; the metal N source comprises a compound of at least one of iron, cobalt and nickel; and mixing the heat-treated material with lithium salt and a second carbon source, and carrying out roasting treatment to obtain the graphite regenerated material. The regeneration method disclosed by the invention is particularly suitable for repairing the artificial graphite waste which is difficult to treat, so that the artificial graphite waste can be repaired to obtain a material with excellent capacity, long circulation and particularly low-temperature stability.

The invention discloses a photoresist stripping liquid composition and application thereof, and the photoresist stripping liquid composition comprises the following components by mass: 10-40wt% of an alcohol ether solvent, 10-40wt% of a solvent, 10-40wt% of a solvent, 10-40wt% of a solvent, and 10-40wt% of a solvent. 20 wt% to 50 wt% of a polyol solvent; 0.5 wt% to 10 wt% of an alkanolamine compound; 0.02 wt%-2 wt% of a metal corrosion inhibitor; 0.01 wt% to 1 wt% of a surfactant; 0.01 wt%-1 wt% of an auxiliary additive; and the balance of water. According to the invention, the octanol / water partition coefficient of the mixed solvent of the alcohol ether solvent and the polyhydric alcohol is limited, so that the dissolving capacity of the stripping liquid to photoresist is improved, the service life of the stripping liquid is prolonged, and the stripping liquid is easy to wash and remove and less in residual quantity; in addition, the organic acid metal corrosion inhibitor and the metal inhibitor in the photoresist stripping liquid composition are matched with each other, so that the photoresist stripping liquid composition can be compatible with copper and aluminum processes, and corrosion of the photoresist stripping liquid composition to a metal layer is reduced.

The invention discloses bacillus capable of tolerating various organic solvents and application of the bacillus. The invention provides a bacillus sp. YL23 strain, and the preservation number of the bacillus sp. YL23 strain is CGMCC (China General Microbiological Culture Collection Center) NO.29579. Also provided is the use thereof in the preparation of recombinant microorganisms for industrial fermentation. YL23 has potential application value in the technical field of industrial biology, including that substitute raw materials such as xylose can be utilized to ferment and produce target chemicals under acidic and high-temperature conditions. The characteristic can realize high-temperature production in the field of fermentation, and the processes of sterilization and the like are reduced. Meanwhile, the acid fermentation condition and the good organic solvent tolerance characteristic are beneficial to accumulation of target products such as organic acid.

The invention discloses a water-based soldering flux for a photovoltaic N-type battery 0BB assembly and a preparation method of the water-based soldering flux, and belongs to the technical field of soldering flux. The soldering flux is prepared from the following raw materials in parts by weight: 30-60 parts of deionized water, 30-50 parts of an alcohol solvent, 2-8 parts of a high-boiling-point solvent, 1-4 parts of organic acid, 0.1-1 part of a surfactant, 0.1-1 part of an antioxidant, 0.1-1 part of a corrosion inhibitor, 0-1 part of psicose and 0-1 part of trimethylolpropane tricaprylate. According to the invention, the problem of negative influence on tension of thermosetting adhesive and alloying of a fine grid when a traditional soldering flux is applied to a photovoltaic N-type battery 0BB assembly is solved.

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention relates to the technical field of sodium ion battery positive electrode materials, and discloses a preparation method and application of a carbon-coated sodium ferric sulfate positive electrode material, and the preparation method comprises the following steps: (1) adding an iron source into an aqueous solution containing an organic acid, and stirring, the organic acid being ascorbic acid and / or citric acid; adding a sodium source or the sodium source and a sulfuric acid source, and stirring; (2) finally adding a carbon source, dropwise adding absolute ethyl alcohol while stirring, vacuumizing after dropwise adding, and continuously stirring for 2-4 hours to obtain a mixed solution; and (3) carrying out closed spray drying on the mixed solution, and calcining in an inert atmosphere to obtain the carbon-coated sodium ferric sulfate positive electrode material. According to the preparation method, coating of the carbon material is achieved in a closed spray drying mode, the conductivity of sodium ferric sulfate is greatly improved, in the whole preparation process, contact with oxygen is avoided, organic acid with an anti-oxidation effect is avoided, ferrous iron is prevented from being oxidized, and then the electrochemical performance can be further improved.

The invention relates to the technical field of welding cleaning agents, in particular to an aluminum alloy welding cleaning agent and a preparation method and application thereof. The aluminum alloy welding cleaning agent comprises the following raw materials in parts by mass: 10-20 parts of organic acid, 1-3 parts of modified silicon dioxide, 0.1-0.5 part of a chelating agent, 1-2 parts of an acidic dispersant, 2-5 parts of a corrosion inhibitor, 1.1-3 parts of a penetrant, 5-10 parts of a defoaming agent and 60-100 parts of water. The cleaning agent is reasonable and scientific in formula, simple to prepare, free of special equipment, high in cleaning capacity, capable of achieving an excellent cleaning effect at low temperature, short in time, good in working efficiency and extremely high in cleaning efficiency on oil stains on metal surfaces, especially aluminum alloy surfaces, and the corrosivity is obviously reduced.

The invention belongs to the technical field of mine filling materials, and discloses a solid-waste-based mine filling material and a preparation method thereof. The filling material comprises 70-100 parts of red mud, 1-10 parts of fly ash, 1-10 parts of slag, 5-20 parts of an acid activator, 10-30 parts of aggregate, 1-5 parts of a water reducing agent and 50-100 parts of water. The doping amount of the red mud of the filling material can reach 60% or above, the red mud is used as a main cementing material, formic acid, acetic acid, oxalic acid and other small-molecular organic acids are used as an acid activator, and an acid environment provided by the acid activator can reduce the alkalinity of the red mud and promote the dissolution of the red mud; the water and calcium silicate in the red mud can be more easily subjected to hydration reaction to generate a large amount of hydration products such as C-S-H gel, so that the strength of the filling material is enhanced. The acid activator used in the invention is low in cost, the cementing material and the aggregate are industrial solid wastes, and the cost of the mine filling material is reduced while the problem of resource utilization of the industrial solid wastes is solved.

The invention provides a carbon emission management monitoring method and device for rice planting in a cold region, and relates to the technical field of carbon emission management monitoring. Vertical three-layer parameters of a soil profile, namely the surface methane concentration, the middle oxidation-reduction potential and the deep organic acid concentration, are collected; the method comprises the following steps: mapping a middle-layer potential into an inhibition coefficient according to a microbial electrochemical principle, further calculating potential uplink electron flux and actual downlink electron sedimentation intensity, identifying an electron transport chain breakage risk through a residual error of the potential uplink electron flux and the actual downlink electron sedimentation intensity, and carrying out nonlinear fusion on the electron transport residual error and environment weights of all layers by adopting a p-norm model. Through the risk amplification coefficient, the superlinear conduction of the local risk to the whole system is realized, the dominant risk layer is accurately positioned based on the comprehensive weight, the differential field management strategy is automatically generated, and finally the closed-loop intelligent management normal form is constructed, and the accurate control of the carbon emission based on the mechanism model is realized.

The invention relates to the technical field of welding materials, and discloses washable semiconductor solder paste and a preparation method and application thereof. The washable semiconductor solder paste comprises scaling powder and tin powder, wherein the mass ratio of the scaling powder to the tin powder is 1: (8-9.6); the soldering flux comprises the following raw material components: a film-forming agent, composite organic acid, a thixotropic agent, a surfactant, an antioxidant and a solvent, wherein the composite organic acid is composed of succinic acid and glutaric acid according to the mass ratio of (1-3): (1-2.5). According to the washable semiconductor solder paste, the particle size, the melting point and the alloy components of the tin powder are controlled, composite organic acid composed of succinic acid and glutaric acid in a specific proportion is adopted in the soldering flux, and other components are matched with one another; the tin powder and the soldering flux in a specific mass ratio are combined, so that the prepared washable semiconductor solder paste is good in wettability, the expansion rate is larger than or equal to 85%, the storage life reaches 3 months, and the washable semiconductor solder paste can be directly cleaned with water after being welded and is high in corrosion resistance and oxidation resistance.

The invention discloses a method for preparing 12-mercaptan through solid organic acid catalysis, belongs to the technical field of 12-mercaptan preparation, and aims to solve the problems of low catalyst activity, harsh reaction conditions, serious pollution, high cost and dependence on import in the prior art. N-dodecanol and hydrogen sulfide are used as raw materials and are mixed according to the molar ratio of 1: 1.2-1: 1.3; the method comprises the following steps: gasifying n-dodecanol, mixing with purified hydrogen sulfide, preheating to 210-240 DEG C, introducing into a fixed bed reactor filled with a solid organic acid catalyst, and reacting at-0.08-3.0 MPa for 3.5-4 hours; and cooling and condensing the reaction product, carrying out gas-liquid separation, rectifying and purifying the liquid product to obtain 12-mercaptan with the purity of more than or equal to 99.5%, and recycling unreacted hydrogen sulfide. The solid organic acid can be a catalyst of p-toluenesulfonic acid and the like or mesoporous silica loaded nickel, cobalt and molybdenum metal oxides. The method has the advantages of high catalytic activity, mild reaction conditions, high product yield (the conversion rate of n-dodecanol is greater than or equal to 94.5%), environmental protection and low cost, can realize the domestic mass production of 12-mercaptan, and meets the market demand.

The invention discloses a high-stability antirust emulsified cutting fluid, which is composed of the following components by mass: 0.2-1% of a copper corrosion inhibitor, 5-10% of organic amine, 3-10% of an organic acid, 5-10% of an emulsifier, 35-45% of base oil, 1-3% of a preservative, 0.1-1% of an acidic corrosion inhibitor, 10-20% of a lubricating additive, 1-3% of a coupling agent, 0.5-2% of an antifoaming agent, and the balance of water. The emulsifier is composed of a nonionic surfactant and an anionic surfactant, and the acidic corrosion inhibitor is an imidazole compound. Compared with the existing emulsified cutting fluid, the emulsified cutting fluid has high stability in high-temperature, low-temperature, high-hardness water and slightly acidic systems, has good antirust, lubricating, cooling and cleaning performances, can effectively improve the processing efficiency, prolong the service life of equipment and improve the quality of workpieces, and is especially suitable for cutting of ferrous metals.

The present invention relates to a modified inorganic particle doped water-based paint and a preparation method thereof, belonging to the technical field of water-based paint. The raw materials for preparing the water-based paint include, by weight, 35-50 parts of water-based acrylic resin, 5-10 parts of modified inorganic particles, 8-12 parts of polyvinyl alcohol, 0.1-0.5 parts of defoaming agent, and 0.1-0.5 parts of dispersant; the modified inorganic particles are obtained by mixing nano titanium dioxide flame retardant particles, organic acid and biomass and then subjecting them to hydrothermal treatment, and the nano titanium dioxide flame retardant particles are obtained by subjecting polyimide particles and nano titanium dioxide particles to thermal treatment. The modified inorganic particles proposed by the present invention have good dispersibility and strong interaction force with the water-based paint matrix. Nano titanium dioxide is used instead of nano alumina, applied to water-based paint, and the flame retardancy of the water-based paint is increased. Organic acid, biomass powder and nano titanium dioxide flame retardant particles are used for hydrothermal treatment to increase the antibacterial durability of the water-based paint.

The invention discloses a preparation method and application of organic peptide salt in the field of organic peptide salt, and the preparation method comprises the following steps: step 1) extraction of azolla filliculoidas active peptide: performing crushing, enzymolysis or ultrasonic-assisted extraction on azolla filliculoidas raw materials to obtain an azolla filliculoidas active peptide crude extract; and (2) purifying the rumex hanus active peptide. According to the method, the azolla filliculoidas active peptide is subjected to graded purification by adopting an ultrafiltration membrane separation technology, an active peptide component with uniform molecular weight distribution is obtained, and a high-quality raw material is provided for subsequent reaction; organic acid selection and reaction conditions are optimized, the yield and purity of the organic peptide salt are remarkably improved by selecting specific organic acid and optimizing the reaction conditions, ultrasonic-assisted reaction is introduced, the uniformity and efficiency of the reaction are improved through the ultrasonic-assisted reaction, and the stability and functionality of the organic peptide salt are further enhanced. The prepared organic peptide salt is not only suitable for the field of food, but also can be widely applied to health care products and cosmetics, and has remarkable market potential.

The invention discloses stable silicon dioxide microspheres as well as a preparation method and application thereof. Mixing a sodium silicate diluent and an organic acid aqueous solution to form colloidal particles, and carrying out a sol-gel reaction to obtain silica sol; the preparation method comprises the following steps: in an air environment, throwing silica sol into water under stirring to form microspheres, injecting inorganic acid into the water at the same time, then injecting a sodium silicate diluent for reaction, and then adjusting the pH value of the system to 6-7; and aging, washing, drying and roasting to obtain the silicon dioxide microspheres. The preparation method comprises the following steps: mixing a sodium silicate diluent and an organic acid aqueous solution by an acid mixing method, granulating by air to form microspheres, and finally injecting inorganic acid to quickly remove heat, reduce pressure drop and maintain the state of the microspheres, thereby obtaining the stable silicon dioxide microspheres. The porous silicon dioxide microsphere with larger surface area and pore volume is obtained, has better catalytic performance when being used as a catalytic oxidation carrier, and has the advantages of high conversion rate and high stability.

The invention relates to a method for efficiently extracting lithium by roasting lepidolite at low temperature by using composite organic acid. The invention relates to a method for efficiently extracting lithium by roasting lepidolite at low temperature by using composite organic acid, which comprises the following steps of: adding an activating agent into lepidolite concentrate, and pre-activating to obtain activated lepidolite concentrate powder; the lepidolite concentrate powder and a composite organic acid roasting agent are mixed, acidified and roasted, and a roasted product is obtained; adding water into the roasted product for leaching, and carrying out suction filtration to obtain a lithium-containing leachate; the composite organic acid roasting agent at least comprises methanesulfonic acid. According to the method, the problem that the lithium ion extraction efficiency is low due to the fact that the TOT layered structure in the lepidolite is difficult to damage is solved, and the problem that the lithium ion extraction efficiency is low due to the fact that Si-O bonds with high bond energy in an existing lepidolite crystal framework are difficult to dissociate is also solved.

The invention relates to a normal-temperature preparation method of an ultra-narrow emission spectrum perovskite quantum dot composite material. The method comprises the following steps: firstly, mixing wide bandgap nanocrystals with a high-polarity solvent (such as N, N-dimethylformamide and the like) to prepare a wide bandgap nanocrystal solution; respectively mixing with perovskite quantum dot reaction precursors (such as CsBr, PbBr2 powder and the like) to prepare a reaction precursor solution; and mixing the reaction precursor solution, organic acid, organic amine and the like, and then adding a reverse polar solvent to form a precipitate, thereby preparing the perovskite quantum dot composite material with the ultra-narrow emission spectrum. The perovskite quantum dot composite material with the full width at half maximum of 15 nanometers or below can be prepared at normal temperature, and the minimum full width at half maximum can reach 14.4 nanometers.

The invention relates to the technical field of reverse osmosis membranes, and particularly discloses an anti-pollution reverse osmosis membrane and a preparation method thereof.The preparation method comprises the steps that organic amine and organic acyl chloride are used for conducting interfacial polymerization reaction on a bottom membrane to prepare a polyamide layer; the photoinitiator containing amino or phenolic hydroxyl reacts with acyl chloride groups left on the polyamide layer after interfacial polymerization, and the photoinitiator is introduced into the surface of the film; pouring a zwitterionic solution on the surface of the membrane at a constant speed, and irradiating under ultraviolet to initiate a polymerization reaction; performing heat treatment on the membrane in a drying oven to obtain the anti-pollution reverse osmosis membrane. The zwitterionic polymer is efficiently grafted on the surface of the membrane by utilizing a photo-initiation free radical polymerization strategy, compared with a traditional grafting method, the operation process is simple, the grafting speed is high (within 5min), the use of an organic solvent is reduced, and the prepared reverse osmosis membrane has excellent anti-pollution performance and huge industrial application potential.

The invention relates to the technical field of solder paste, in particular to halogen-free soldering flux for solder paste and a preparation method of the halogen-free soldering flux. The halogen-free soldering flux for the solder paste comprises the following raw materials in parts by mass: 20-40 parts of hydrogenated rosin, 1-5 parts of maleic anhydride, 0.1-0.4 part of p-toluenesulfonic acid, 1-5 parts of activated mesoporous silica, 10-20 parts of a composite organic acid active agent, 5-10 parts of a thixotropic agent, 1-3 parts of a tackifier, 1-2 parts of a pH regulator, 1-2 parts of a surfactant, 1-2 parts of a chelating agent, 1-2 parts of an antioxidant and 50-80 parts of an organic solvent. Through the innovative component design and the preparation process, the technical contradiction existing in the field of halogen-free scaling powder for a long time is effectively solved, and an ideal material solution is provided for high-reliability electronic packaging.

A composition having an additive or component having an antimicrobial or a preservative property, and 3-phenylpropanol or a member of the phenylpropanoid family is provided. A composition having a polymer, an organic acid, and 3-phenylpropanol or a member of the phenylpropanoid family is provided as well as a method(s) of using.

The invention provides an efficient and environment-friendly reverse osmosis membrane scale inhibition cleaning agent based on a composite formula, and relates to the field of reverse osmosis membrane cleaning. Comprising effective components and water, and the effective components comprise the following raw materials in percentage by mass: 10-15% of a surfactant, 10-15% of a sterilizing agent, 30-40% of a composite chelating agent, 10-20% of slow-release organic acid, 5-10% of compound enzyme, 5-10% of an oxidizing agent and 1-5% of a defoaming agent; the composite chelating agent is a compound which takes attapulgite and montmorillonite as carriers and is loaded with hydroxyethyl ethylenediamine triacetic acid trisodium salt; the slow-release organic acid is citric acid modified by carboxymethyl chitosan. The cleaning agent provided by the invention contains the composite chelating agent, the slow-release organic acid, the compound enzyme, the surfactant, the sterilizing agent and the like in effective components, is prepared into the cleaning agent with water, has the effect of efficiently cleaning the reverse osmosis membrane, and is high in cleaning efficiency and small in damage to the reverse osmosis membrane.