43results about How to "Increase electrostatic repulsion" patented technology

The invention discloses a modification method of a PVDF (Polyvinylidene Fluoride) separation membrane, and belongs to the technical field of water treatment. The modification method provided by the invention comprises the step of impacting the PVDF separation membrane by adopting high-pressure liquid, so that high-pressure micro-droplets are in high-speed friction with the surface of the PVDF separation membrane. According to the modification method provided by the invention, the hydrophilicity, the surface potential and the dye retention rate of the PVDF separation membrane can be effectively improved.

The invention relates to the technical field of oilfield exploitation, and discloses a nanometer oil-displacing agent for oilfield oil extraction and a preparation method thereof.The nanometer oil-displacing agent takes modified nanometer silicon dioxide and a surfactant as main components, polymer macromolecules are modified on the surface of the nanometer silicon dioxide to serve as a main body of the nanometer oil-displacing agent, and the nanometer oil-displacing agent is prepared. Under the action of the surfactant, the nano silicon dioxide can flow into the fine throat and the micro throat, and the polymer macromolecules of the branched structure can generate a relatively strong interaction force with the rock, so that the polymer macromolecules are firmly adhered to the surface of the rock, the adhesion of crude oil on the surface of the rock is reduced, a smooth crude oil channel is constructed, and the flowing pressure of liquid is reduced; and crude oil fluidity is improved. The structure of the cross-linking agent contains quaternary ammonium cations, so that the electrostatic repulsion effect between nano silicon dioxide can be greatly enhanced, aggregation between nano silicon dioxide and nano silicon dioxide can be avoided, the interfacial tension can be efficiently maintained, the oil-water interfacial tension is greatly reduced, and the recovery rate of crude oil is effectively increased.

The invention belongs to the technical field of intelligent controlled-release antibacterial packaging, and particularly relates to a preparation method and application of a multi-response polymer fresh water absorption pad of a sandwich-like structure. The preparation method comprises the following steps: firstly, preparing a hydrophilic inner-layer spinning solution, a humidity response middle-layer spinning solution and a pH response outer-layer spinning solution; the hydrophilic inner layer spinning solution, the humidity response middle layer spinning solution and the pH response outer layer spinning solution are subjected to continuous electrostatic spinning to prepare a composite membrane of a three-layer nanofiber structure, namely the multi-response polymer fresh water absorption pad of a sandwich-like structure. Through the layered design, the water absorption pad integrates the functions of one-way moisture transmission, antibiosis and corrosion prevention, the preservation period of food is prolonged, self-adaptive adjustment can be achieved according to the humidity and pH change in the storage environment, the dynamic requirements of different food storage conditions are met, and the more accurate preservation effect is provided. And meanwhile, various food packaging requirements can be met, food loss is effectively reduced, economic benefits are improved, and the application prospect is wide.

The invention mainly relates to the technical field of high-performance ceramic filler nano titanium dioxide, and discloses a preparation method of high-dispersion nano titanium dioxide, which comprises the following steps: slowly dropwise adding a pretreated titanium source into a mixed solvent to prepare a titanium source solution; the preparation method comprises the following steps: adding water and a mixed inhibitor into a reaction kettle, uniformly stirring, slowly dropwise adding the prepared titanium source solution into the reaction kettle, and continuously stirring in the dropwise adding process; cooling the product to room temperature, adding a dispersing agent, aging for a period of time, and slowly adding nano silicon dioxide sol; washing the aged product, and then carrying out vacuum drying treatment; and calcining the dried product at 300-350 DEG C for 1-1.5 hours, then heating to 480-550 DEG C, calcining for 2-2.5 hours, and controlling the heating rate to be 1.5-2 DEG C / min, thereby obtaining the nano titanium dioxide product with uniform granularity and high dispersity after calcining. According to the invention, through optimization of the preparation process, the particle size of the nano titanium dioxide is in a small range, and good particle size uniformity and dispersibility are still kept.

The invention relates to the technical field of powder coatings, in particular to high-fluidity superfine molding powder and a preparation method thereof. The high-fluidity superfine plastic powder comprises the following components in parts by weight: 40-50 parts of epoxy resin, 15-25 parts of a curing agent, 2-4 parts of a catalyst A, 3-5 parts of a plasticizer, 5-8 parts of polyacrylic acid and / or polyacrylate, 3-5 parts of a silane coupling agent, 10-20 parts of filler and 4-6 parts of other auxiliaries, the curing agent at least comprises a fluorine modified amine curing agent; and the median particle size D50 of the powder coating is 10-20 [mu] m. The powder coating adopting the epoxy resin / fluorine-modified amine curing agent system has better flowability and uniformity, charged powder particles can be guided to the surface of a workpiece under the action of an electric field to form a uniform thin coating, the powder particles are easier to carry charges with the same polarity, repulsive force among the particles is increased, and the powder coating can be applied to the surface of the workpiece. Uniform dispersion of powder particles can be kept, and the phenomenon of particle agglomeration is reduced.

The invention discloses a preparation method of low-temperature sintered ceramic. The preparation method comprises the following steps: S1, pretreating kaolin; s2, modifying kaolin; s3, preparing a ceramic green body; s4, preparing a glaze material; and S5, preparing the low-temperature sintered ceramic. According to the low-temperature sintered ceramic provided by the invention, the kaolin is pretreated and modified, and the special grinding aid is added in the preparation process of the ceramic green body, so that the sintering temperature of the ceramic is effectively reduced, the sintering process is optimized, low-temperature sintering of the ceramic is realized, the energy consumption is reduced, and the production efficiency is also improved; the method has remarkable economic benefits and environmental protection significance, and the prepared ceramic has good mechanical properties.

The invention relates to the technical field of building materials, and discloses an alumino-ferroate cement water reducer and a preparation method thereof. The prepared unsaturated zwitterionic cyclodextrin is polymerized with maleic anhydride and acrylic acid to obtain the alumino-ferroate cement water reducer. The cyclodextrin has a hollow cylindrical stereoscopic structure, which brings a significant steric hindrance effect to the polymer. The sulfonic acid groups on the main chain of the water reducer are anchored on positively charged cement particles to generate strong adsorption. The quaternary ammonium salt cations can be adsorbed on the surface of the negatively charged cement particles, so that the cement particles can achieve a better dispersion effect and the fluidity of the cement paste is improved. The presence of the cyclodextrin side chain and the polyethylene glycol long chain affects the cement hydration process, can effectively weaken the interpenetration between the water reducer molecules and the clay layer, enriches the preparation method of the synthetic alumino-ferroate cement water reducer, and is easy to realize industrial production.

The invention provides a polycrystalline diamond chemical mechanical polishing method based on two-step zeta potential regulation and control, and relates to the field of ultrahard material ultra-precision machining, the method comprises the steps of mechanical polishing, zeta potential regulation and control rough polishing in chemical mechanical polishing, zeta potential regulation and control fine polishing in chemical mechanical polishing, and cleaning, and finally the polycrystalline diamond with the low-damage and high-quality surface is obtained. By regulating and controlling the zeta potential of the polishing solution in the fine polishing and rough polishing processes, the mechanical damage of the abrasive material in the polishing solution to the polycrystalline diamond can be reduced, and the surface quality of the polished polycrystalline diamond can be improved, so that low-damage and high-quality machining of the polycrystalline diamond is realized.

The invention discloses a large-site impedance mud type polycarboxylic acid water reducer, which is a segmented copolymer formed by an unsaturated polyoxyethylene ether monomer, a tristyrylphenol polyoxyethylene ether phosphate monomer and an unsaturated carboxylic acid monomer. On the basis of a traditional polycarboxylate superplasticizer structure, tristyrylphenol polyoxyethylene ether phosphate, a polycarboxylate superplasticizer with a molecular structure containing a polyoxyethylene ether long chain, a large steric hindrance group with a plurality of benzene ring structures and a phosphate group with a mud-resistant function are further introduced; the water reducing agent can reduce the adsorption of soil to the water reducing agent under the condition of low mixing amount, ensures a better water reducing effect, and is suitable for popularization and application.

The invention relates to the technical field of building admixtures, in particular to an anti-mud foam-stabilizing slump retaining material and a preparation method thereof. The preparation method comprises the following steps: dropwise adding a comonomer mixture solution, an initiator aqueous solution and a molecular weight regulator aqueous solution into a reaction kettle filled with water, stirring and reacting at the reaction temperature of 5-80 DEG C for 1.0-2.0 hours, continuously reacting for 0.5-2.0 hours after dropwise adding to obtain a copolymerization product, and regulating the pH value to 5-7 by using alkali to obtain the anti-mud foam-stabilizing slump retaining material, the prepared slump retaining material is excellent in slump retaining performance, has a very good air entraining effect, is more stable in bubbling when being applied to concrete, can further improve the lubricating effect of particles in multiple systems of the concrete, endows the concrete with an excellent anti-mud function, can reduce concrete segregation and bleeding, has an early strength effect, and has a good anti-mud effect. Even in the harsh process of stirring, long-distance transportation, frequent loading and unloading and even final pouring of concrete, bubbles can still keep the integrity and do not crack or overflow.

This invention relates to an MPL composite adjuvant and its preparation method, belonging to the field of vaccine adjuvant technology. The composite adjuvant comprises neutral phospholipids, anionic phospholipids, cholesterol, monophospholipid A, QS-21, and surface-modified lipids. The preparation method includes: dissolving the lipid components in an organic solvent to form a mixed solution, evaporating the solvent to form a lipid film, adding buffer solution for hydration to form a liposome suspension, sonicating to obtain small monolayer liposomes, and then mixing with a QS-21 micelle solution. This invention significantly improves the stability of the adjuvant by introducing surface-modified lipids, exhibiting small particle size, uniform distribution, high negative zeta potential, good stability in serum environments, and the ability to induce high-level antibody immune responses, making it suitable for vaccine development.

The present application belongs to the technical field of preparation of multi-curved surface silicon carbide, and discloses a preparation method of reaction sintering multi-curved surface silicon carbide whole plate, comprising: mixing 100 parts of alpha-SiC powder, 15-20 parts of composite carbon source, 1-2 parts of silicon carbide fiber, 2.3-3.8 parts of dispersing agent, 8-12 parts of water-soluble phenolic resin, 2-4 parts of additive and 42-46 parts of water according to weight parts, pre-dispersing, ball-milling, spray granulating, pressing into multi-curved surface green body; the green body is stacked with graphite support parts and filled with graded silicon particles, and is subjected to step-by-step degreasing and step-by-step reaction sintering under vacuum argon, and then is cooled after temperature control to obtain the product. Through the synergistic effect of formula control of composite carbon source, specific ternary additive and fine sintering process, the technical problem of sintering cracking and cracking of multi-curved surface whole plate is eliminated, and the product density, bending strength and fracture toughness are effectively improved.

The invention discloses low-viscosity titanium dioxide slurry and a production method thereof. The production method comprises the following steps: S1, preparing a dispersing agent; s2, desalted water is added into a pulping tank, then calcined and crushed titanium dioxide is added for pulping, and the dispersing agent in the S1 is stirred for 10-20 minutes; and S3, adding a defoaming agent and supplementing water into the titanium dioxide slurry prepared in the S2 while stirring, so that the concentration of the titanium dioxide slurry is 1,000-1,200 g / l, continuously stirring for 5-25 minutes, and sanding to obtain the titanium dioxide. The dispersing agent and the defoaming agent are added in the pulping process of the titanium dioxide slurry, and the slurry viscosity is greatly reduced when the concentration of the titanium dioxide sanding slurry is increased, so that the feeding amount of the titanium dioxide slurry is increased during sanding, and the working efficiency of a sand mill is improved.

The invention relates to the technical field of building admixtures, in particular to a foam-stabilizing functional monomer, a long-acting foam-stabilizing slump retaining material for small-slump concrete and a preparation method of the long-acting foam-stabilizing slump retaining material. A foam-stabilizing functional monomer prepared from pentaerythritol allyl ether, alkylene oxide and an epoxy sulfonic acid compound through an addition polymerization reaction is used for synthesizing the long-acting foam-stabilizing slump retaining material for the small-slump concrete, and the prepared long-acting foam-stabilizing slump retaining material for the small-slump concrete not only has excellent slump retaining performance, but also has a good air entraining effect; the concrete slump retaining agent is more stable in foaming when being applied to concrete, can prevent bubbles from cracking or overflowing in the concrete stirring, transporting, loading, unloading and pouring processes, is particularly suitable for small-slump concrete projects with long-acting slump retaining requirements, and has important practical application value.

This invention belongs to the field of high-efficiency concrete water-reducing agents, specifically relating to a composite polycarboxylate anti-mud water-reducing agent, its preparation method, and its application. The composite polycarboxylate anti-mud water-reducing agent comprises the following raw materials: 30-40 parts by weight of anti-mud polycarboxylate water-reducing agent and 1-3 parts by weight of anti-mud sacrificial agent. The anti-mud polycarboxylate water-reducing agent is polymerized from methyl allyl polyoxyethylene ether and unsaturated carboxylic acid under the initiator and chain transfer agent. The anti-mud sacrificial agent is obtained by adding 4-5 parts by weight of hydrogen peroxide to 20-30 parts by weight of papermaking black liquor. The anti-mud sacrificial agent effectively resists the interference of soil on the polycarboxylate water-reducing agent and is simple to prepare, environmentally friendly, and pollution-free. The composite polycarboxylate anti-mud water-reducing agent prepared by this invention has good anti-mud properties, exhibits good dispersibility in mud-containing concrete, and also has good slump retention properties.

The invention discloses a preparation method of nano calcium carbonate with high dispersity and high activation degree. In the initial stage of the aging process, polyepoxysuccinic acid is adopted as a dispersing agent, and in the modification process, gamma-glycidyl ether oxypropyl trimethoxy silane / XH-CS05 / stearic acid is used for composite modification, so that the surface performance is greatly optimized, the hydrophilic performance is reduced, the closest distance between calcium carbonate particles is effectively increased, and the service life of the calcium carbonate particles is prolonged. Meanwhile, gaps among the particles are filled, mutual agglomeration of the calcium carbonate particles is successfully prevented, and the dispersity among the particles is improved. According to the prepared nano calcium carbonate with high dispersity and high activation degree, the activation degree is as high as 100%, the oil absorption value is 28g / 100g, the specific surface area BET value is 37.3668 m / g, and the nano calcium carbonate has the characteristics of high activation degree, low oil absorption value and relatively high specific surface area. The nano calcium carbonate modified by the method has the advantages of high activation degree, good dispersibility, simple process, convenient operation, easily available raw materials and the like, is easy to realize industrial production, and can be better applied to downstream products.

The present application relates to the technical field of metal powder material preparation, and particularly relates to a porous silver powder, a preparation method and application, by introducing a carbonate foaming agent into raw materials, the carbonate foaming agent can react with nitric acid generated in a liquid phase reduction process of silver nitrate and a reducing agent to generate carbon dioxide bubbles, and the carbon dioxide bubbles play an inducing role in a silver microcrystal formation process, so that the generated silver powder has a rich pore structure and a high specific surface area. Compared with the porous silver powder in the prior art, the porous silver powder has a higher specific surface area and sintering activity, by controlling the addition amount of the foaming agent, the pore structure, the specific surface area and the sintering activity of the silver powder can be accurately controlled, and the control method is simple, and the problems of low pore structure and high cost in the preparation of the porous silver powder in the prior art are solved.

The invention relates to the technical field of marine equipment antifouling, in particular to a preparation method and application of an electrostatic repulsion antifouling coating material, and the preparation method comprises the following steps: S1, adding quantitative fluorinated graphene and tetraethylammonium chloride into organic silicon resin, grinding and dispersing uniformly to obtain a dispersed resin matrix; s2, dimethyl silicon dioxide and a silane coupling agent KH580 are added into the resin matrix obtained in the step S1 to be evenly mixed, and the antifouling coating material is obtained.The water medium and the surface of the antifouling coating material are in frictional contact for electrification, an electrified surface is formed, repulsive interaction is generated, and therefore antifouling is achieved, and the antifouling coating material can be suitable for the marine environment and has good application prospects. And the FG on the surface of the coating has high stability, is non-toxic and harmless, and is very environment-friendly.

The invention relates to the technical field of building admixtures, in particular to a high-efficiency stable asphalt emulsifier, emulsified asphalt and a preparation method thereof. The efficient stable asphalt emulsifier provided by the invention combines the advantages of a nonionic emulsifier and a cationic emulsifier, so that the emulsifying capacity is remarkably improved, the emulsifying range is expanded, the storage stability of emulsified asphalt is improved, and the stability of asphalt emulsion can be remarkably improved. The preparation method comprises the following steps: polymerizing pentaerythritol allyl ether, ethylene oxide and polyethylene polyamine to prepare an intermediate; and then copolymerizing the intermediate with a styrene compound and a polyether macromonomer EPEG (Ethylene Glycol) to finally prepare the emulsifier. The emulsified asphalt provided by the invention has good storage stability, can meet the requirements of different transportation distances in actual construction, and has important actual application value.

The invention relates to the technical field of concrete admixture preparation, and particularly discloses a cement concrete admixture and a preparation method and application thereof.According to the cement concrete admixture, through multi-synergistic copolymerization of a polyether macromonomer, acrylic acid, modified cellulose and sodium allysulfonate in a specific proportion, the cement concrete admixture is prepared; the comprehensive performance of the concrete is improved. Methylallyl alcohol polyoxyethylene ether and acrylic acid construct a main framework of the admixture, so that the steric hindrance and the initial dispersion force of a foundation are guaranteed; by sulfonating cellulose and introducing a negatively charged sulfonic acid group, the flocculation structure among cement particles can be broken, and the initial water-reducing rate and the flowing speed are remarkably improved; and by introducing a carbon-carbon double bond, the modified cellulose can be introduced into a polycarboxylic acid macromolecular chain through a copolymerization reaction, and a rigid cellulose skeleton and a flexible polyether side chain jointly construct a three-dimensional space network structure, so that the steric hindrance effect of the admixture is jointly improved.

The invention belongs to the technical field of paper industry manufacturing, and particularly relates to a high-temperature-resistant and oil-stain-resistant food paper bag and application of the high-temperature-resistant and oil-stain-resistant food paper bag in fried food packaging. According to the invention, the coating layer is compounded on the base paper layer, the starch component of the coating layer is modified, and meanwhile, the functional lignocellulose composite material and amino modified magnesium oxide are introduced, so that the high-temperature-resistant and oil-resistant food paper bag is prepared, the bursting strength of the food paper bag is effectively improved, the high-temperature-resistant performance is enhanced, and the service life of the food paper bag is prolonged. And meanwhile, a good oil-proof grade is obtained.

This invention discloses a multi-layer gradient fluidized bed coupled with ultrasound-enhanced calcium fluoride crystallization device, comprising a reaction tower and a cyclone separator connected to the reaction tower. The reaction tower includes a bottom sludge discharge zone, a bottom reaction zone, a middle reaction zone, and a top reaction zone arranged sequentially from bottom to top. The bottom reaction zone includes a bottom reaction shell; a bottom sieve plate is provided at the top of the bottom reaction shell, and a bottom ultrasonic transducer is provided at the top of the bottom reaction shell; a wastewater tangential injection pipe and a calcium solution injection pipe are provided at the bottom of the bottom reaction shell. The middle reaction zone includes a middle reaction shell, and a middle ultrasonic transducer is provided at the top of the middle reaction zone. The top reaction zone includes a top reaction shell, and a top ultrasonic transducer is provided at the top of the top reaction shell. This invention not only improves the layered crystal growth rate but also increases the resource recovery rate.

The invention relates to the technical field of pesticide formulations, and provides a suspending agent containing D-limonene and sophocarpidine and a preparation method thereof.The suspending agent containing D-limonene and sophocarpidine is prepared from, by weight, 0.002%-0.1% of D-limonene, 0.002%-0.1% of sophocarpidine, 1%-5% of wetting agents, 0.5%-2% of defoaming agents, 0.05%-0.2% of thickening agents, 4%-8% of auxiliaries, 1%-5% of antifreeze agents, 1%-3% of stabilizers and the balance solvents, the auxiliary agent comprises an aminoanisole sulfonic acid compound and / or N-hydroxymethyl acetamide. According to the technical scheme, the problems of low stability and poor dispersibility of the suspending agent in the prior art are solved.

The invention discloses stabilized reductive iron-sulfur-based slurry and a preparation method and application thereof.The slurry is an organic matter-coagulant-ferrous sulfide nano-particle suspension and comprises, by mass, 0.5-5% of organic matter, 1-10% of coagulant, 1-10% of ferrous sulfide nano-particle, 1-10% of ferrous sulfide nano-particle and the balance water. And the balance of ferrous sulfide nanoparticles. The preparation method comprises the following steps: mixing and stirring an organic matter solution and a ferrous sulfate solution, then mixing and stirring with a coagulant solution, then slowly dropwise adding a sodium sulfide solution, stirring to form nano ferrous sulfide particles in the mixed solution, then centrifuging, and discarding supernatant liquid to obtain the slurry. The slurry disclosed by the invention can be prepared in a short process and at low cost; the hexavalent chromium polluted water body can be efficiently and rapidly treated; the product can be stored at normal temperature and normal pressure for at least one month without deterioration; the adding amount is small, the treated precipitate is stable, secondary pollution is avoided, and the potential application and popularization value is achieved.

The invention belongs to the technical field of lithium iron phosphate batteries, and particularly relates to a lithium iron phosphate precursor slurry additive and carbon-coated lithium iron phosphate. The main component polycondensate A is rich in amino groups, hydroxyl groups, benzene rings and other functional groups capable of forming strong intermolecular force with lithium iron phosphate, and can be adsorbed on the surfaces of lithium iron phosphate particles during slurry grinding, at the moment, polyether side chains rich in the polycondensate A form a hydrated protective layer, flocculent precipitation between two lithium iron phosphate particles is prevented, and the lithium iron phosphate particles are prevented from being separated from each other. Therefore, uniform particle size distribution of the lithium iron phosphate is ensured, and the viscosity of the slurry is greatly reduced; the compound component ether amine polymer B can also be strongly adsorbed on the surface of the lithium iron phosphate to assist the main component polycondensate A in reducing the viscosity of the slurry; meanwhile, the compound C is an organic salt, so that the electrostatic repulsion on the surface of the lithium iron phosphate can be enhanced, and outstanding effects on reducing the viscosity of the slurry and shortening the grinding time are achieved.

The invention discloses a method for improving the damage of high-dose gallic acid to the emulsification characteristic of meat protein by using a zein / polysaccharide nano system so as to improve the quality of an emulsified meat product, and belongs to the technical field of meat product processing. The preparation method comprises the following steps: preparing a gallic acid-zein / polysaccharide nano-composite, adding the gallic acid-zein / polysaccharide nano-composite into myofibrillar protein, adding a Fenton oxidation system for reaction, and mixing and homogenizing with soybean oil to obtain the myofibrillar protein-based emulsion with improved emulsification characteristics. The zein / polysaccharide nanoparticles are used for encapsulating gallic acid, so that the interaction between gallic acid and myofibrillar protein is weakened, protein aggregation induced by high-dose gallic acid is prevented, the diffusion of protein to an oil-water interface is promoted, the interfacial tension is reduced, the droplet size is reduced, and oil droplet distribution is more uniform; and the emulsion has higher emulsifying activity and lower emulsion separation index. The invention provides a novel method for improving the damage of high-dose phenolic antioxidants to the emulsification characteristic of meat protein.