57results about How to "Lower zeta potential" patented technology

The invention relates to the processing method of the urban sewage and sludge reduction. The flocculating agent A is first added in the urban sewage and sludge and added with flocculating agent B to further react after emulsion breaking reaction. The flocculating agent A is a quaternary ammonium type cationic polymer and the flocculating agent B is a cationic polymer with aminomethyl polyacrylamide as the basis. The urban sludge processed by the method of the invention has volume greatly reduced, hard mud cake, low water ratio, which can meet the requirement of the subsequent landfill, composting and burning treatment and realize the comprehensive utilization of the sludge.

The invention provides a high-temperature-resistant organosilicon-amine inhibitor for a water-based drilling fluid and a preparation method of the organosilicon-amine inhibitor. N,N-dimethylacrylamide, diallyldimethylammonium chloride and gamma-methacryloxypropyltrimethoxysilane in a certain ratio are taken as reaction monomers and subjected to free radical copolymerization, and the inhibitor is prepared; the preparation method is simple, and the yield is high. Indoor evaluation experiments prove that the prepared organosilicon-amine inhibitor not only can effectively inhibit hydration and mud making of bentonite and drilling cuttings at the room temperature of 25 DEG C, but also can still maintain higher inhibition performance after ageing at 220 DEG C for 16 h, and the inhibitor is suitable for drilling operation of an active shale formation.

The invention discloses a polyether demulsifying agent based on hydramine-modified phenolic resin and a synthesizing method thereof. The demulsifying agent is characterized in that the hydramine-modified phenolic resin is taken as an initiator, and is subjected to block polymerization with propylene epoxide and ethylene oxide to obtain a polyether macromolecular demulsifying agent, wherein the mass ratio of the initiator to the propylene epoxide to the ethylene oxide is 1:(29-199):(10-100). The synthesizing method of the polyether demulsifying agent based on hydramine-modified phenolic resin comprises the following steps: synthesizing the phenolic resin; synthesizing the hydramine-modified phenolic resin; and the synthesizing polyether based on the hydramine-modified phenolic resin base. The molecular structure of the demulsifying agent has the characteristics of multiple aromatic rings and multiple branches, oil-water interference strength can be lowered effectively, and the aim of rapidly demulsifying is fulfilled; the demulsifying agent can be used for dehydrating oilfield produced fluid and dehydrating and desalting in oil refineries.

The invention relates to a fluorescent material comprising a fluorescent powder body, SiO2 and metal nanoparticles, wherein the SiO2 is coated outside the fluorescent powder body; and the metal nanoparticles are doped in the SiO2. The fluorescent material has a composition general formula as follows: fluorescent powder body@ (SiO2: Mx), wherein @ expresses coating; the SiO2 accounts for 0.5-0.6 percent of the mass of the fluorescent powder body; M is at least one of Ag, Au, Pt and Pd; and x is the mole ratio of M and SiO2 and is more than or equal to 1.0*10-6 and less than or equal to 6.0*10-3. The obtained fluorescent material not only has good electrical conductivity and luminescent property by doping the conductive metal nanoparticles into SiO2 coating layers; and in addition, the invention not only lowers the zeta potential isoelectric points and prevents the agglomeration of fluorescent powder, but also realizes the protection of the fluorescent powder and enhances the ageing resistant property of the fluorescent powder due to SiO2 coating. Besides, the invention also discloses a preparation method of the fluorescent material.

To provide a surfactant which is obtainable by using substantially no alkali metal, has excellent readhesion prevention ability of finely-pulverized particles at the time of cleaning, and is capable of quite efficient and advanced cleaning. In the present invention, a surfactant which comprises a neutralized salt (AB1) and / or neutralized salt (AB2) is used. Neutralized salt (AB1): a neutralized salt (AB1) which comprises an acidic compound (A1) containing at least each one of an acid group (X1) of an acid having the difference of heat of formation in an acid dissociation reaction (Q1) of 3 to 200 kcal / mol and a hydrophobic group (Y) containing 1 to 36 carbon atoms, and a nitrogen-containing basic compound (B) having the difference of heat of formation in a proton addition reaction of 10 to 152 kcal / mol, wherein (X1) is at least one species selected from a sulfonic acid group, and the like. Neutralized salt (AB2): a neutralized salt (AB2) which comprises a polymer (A2) having at least one acid group (X2) within the molecule, and the nitrogen-containing basic compound (B) having the difference of heat of formation in a proton addition reaction of 10 to 152 kcal / mol.

Methods and systems for enhancing of quality of liquid by treating a source liquid to enhance the concentration of low zeta potential crystals and produce a treated liquid having a higher concentration of low zeta potential crystals that that of the source liquid. The inventive system comprises an aqueous liquid source having a threshold concentration of selected minerals and a low zeta potential crystal generator for treating the aqueous source liquid to produce treated liquid having an enhanced concentration of low zeta potential crystals, and at least one filtration device for substantially removing bacteria, viruses, cysts, and the like from the treated source liquid.

Methods and systems for enhancing of quality of liquid by treating a source liquid to enhance the concentration of low zeta potential crystals and produce a treated liquid having a higher concentration of low zeta potential crystals that that of the source liquid. The inventive system comprises an aqueous liquid source having a threshold concentration of selected minerals and a low zeta potential crystal generator for treating the aqueous source liquid to produce treated liquid having an enhanced concentration of low zeta potential crystals.

The invention discloses a paint mist coagulant suitable for a water-based paint and a preparation method of the paint mist coagulant. The paint mist coagulant is composed of an agent A and an agent B.The agent A comprises water, organic bentonite, polyferric sulfate, carboxymethyl cellulose sodium and a defoaming agent. The agent B comprises an oleophylic polyacrylamide solution and a C12-C16 alkane mixture, and the organic bentonite and polyferric sulfate double emulsifiers in the agent A can be combined with a water-based paint matrix and a solvent more quickly to form flocculates with charges; the agent B takes oleophylic modified polyacrylamide as a flocculating agent to form polynuclear complex ions, so that the particles can be strongly adsorbed and flocculated, and the COD (Chemical Oxygen Demand) is effectively reduced. According to the invention, the agent A and the agent B are placed at the same dosing point (the distance between the agent A and the agent B is about 20cm), so that the time and speed of agglomeration of paint slag are improved, and a better and more efficient paint-water separation effect can be achieved.

The invention relates to a preparation method of an antibacterial stable nanofiltration membrane material, and belongs to the technical field of nanofiltration membranes. Zanthoxylum bungeanum proteinis subjected to extraction and purification to collect an antibacterial peptide. After the antibacterial peptide is loaded onto the surface of a film, loading and coating of bacteria on the surface of a nanofiltration membrane are effectively prevented because the antibacterial peptide structure has excellent antibacterial performance. Meanwhile, because of ultraviolet irradiation grafting, the antibacterial peptide on the surface of the nanofiltration membrane is subjected to a photodegradation reaction under ultraviolet irradiation to generate free radicals to be fixed to the membrane, theloading performance is improved, the problem that the antibacterial peptide is dissolved and dispersed after the surface of the nanofiltration membrane is soaked and used for a long time is effectively solved, and the antibacterial stability of the material is further improved.

The invention discloses a new method suitable for large-scale high-efficiency purification of a water soluble quantum dot-IgG monoclonal antibody conjugate, and belongs to the field of biotechnology. In allusion to the disadvantages that a conventional quantum dot-antibody conjugate has complex purification process and low recovery rate and difficultly realizes large-scale production, glucosamine is adopted to seal residual carboxyl of the quantum dot-antibody conjugate, a surface zeta potential of the conjugate is reduced; by adjusting the pH value of a solution to 4.5-5.0, the net charge content of the conjugate in the solution is further reduced, and the large-scale high-efficiency purification of the quantum dot-antibody conjugate is achieved by an ordinary high-speed centrifugation method. The method simplifies experimental operation procedures of the quantum dot-antibody conjugate, reduces requirements on separation equipment, is suitable for large-batch purification of the quantum dot-IgG monoclonal antibody conjugate, allows the yield to be more than 85%, and allows fluorescence characteristics and biological activity of the conjugate to have no significant changes.

The invention relates to a high-efficiency separation and purification method of graphite oxide, which comprises the following steps: slowly and uniformly adding flocculant into deionized water, and dissolving while stirring, thus obtaining a flocculant solution; adding the flocculant solution into a graphite oxide suspension at a uniform speed, stirring, and standing to obtain a liquid containing stable graphite oxide floccules; performing solid-liquid physical separation on the liquid containing stable graphite oxide floccules to obtain high-solid-content graphite oxide; and adding the high-solid-content graphite oxide into deionized water again, uniformly mixing, and repeating the physical separation process until the pH value of the filtrate is 4-8, thus obtaining high-purity graphite oxide. The method provided by the invention has the advantages of high product yield, short production cycle, less pollution, low energy consumption and simple operation process.

The invention discloses a comb-shaped modified styrene-carboxylic acid copolymer and an application thereof. The comb-shaped modified styrene-carboxylic acid copolymer comprises a styrene unit and a maleic acid graft modification unit, and is prepared from a main-chain polymer SMA (polystyrene maleic anhydride resin) and one or two of N, N-dialkyl polyether amine and N,N-dialkyl substituted diamine through a reaction in water at the temperature of 40-90 DEG C under catalysis of solid acid, or is prepared from the main-chain polymer SMA and one of N, N-dialkyl polyether amine and N,N-dialkyl substituted diamine through a reaction with one of amino alcohol and animo-terminated polyether; the comb-shaped modified styrene-carboxylic acid copolymer as a dispersing agent is used for dispersing color paste of cathode electrophoretic paint, the dispersing agent is mixed with the color paste, and then the mixture is mixed with a main resin emulsion, so that zeta potential of obtained paint is apositive value.

The invention relates to a dedicated anionic trash scavenger for papermaking, which is characterized by comprising the following components in part by weight: 0.5-5 parts of polyacrylamide, 0.4-5 parts of cationic monomer, 0.4-4 parts of polyethyleneimine and 0.5-5 parts of cross-linking agent. The preparation method is as follows: dissolving and emulsifying the polyacrylamide, polyethyleneimine, cationic monomer and cross-linking agent and performing the cross-linking reaction to generate a polyacrylamide-polyethyleneimine crosslinked polymer. The invention has the benefits that through the modified polyacrylamide-polyethyleneimine crosslinked polymer, the cationic charge density is increased, and the bi-component crosslinked polymer can be used under the highly-sealed circulating water and very complex anionic trash environment, stably neutralize the anionic trash and directly form electrostatic adsorption together with fiber and filler to enable the fiber and filler to be in retention, and through the bridging effect and fiber combination, the retention rate of fine fiber is improved.

The invention relates to a polycarboxylate flow regulator for water-based drilling fluid and completion fluid with ultra-high temperature and ultra-high density and a preparation method of the polycarboxylate flow regulator. A zwitterionic polycarboxylate multi-polymer with a comb type structure is produced from alkenyl benzene sulfonate, strongly hydrophilic cationic alkenyl quaternary ammonium salt and allyl polyoxyethylene ether containing a specific long chain structure by free radical polymerization in an aqueous solution. A molecular chain of the produced multi-polymer contains 7-20 structural units with weight-average molecular weight in the range of 6,500-12,500. The polycarboxylate flow regulator can greatly reduce viscosity and shear force of the water-based drilling fluid and completion fluid with ultra-high temperature and ultra-high density, improve the dispersion state of solid phase weighting materials in the water-based drilling fluid and completion fluid, improve the rheological property of the water-based drilling fluid and completion fluid with ultra-high temperature and ultra-high density, obviously reduce surface tension of the water-based drilling fluid and completion fluid with ultra-high temperature and improve lubricating performance of the water-based drilling fluid with ultra-high temperature and ultra-high density, has shale inhibition performance and high temperature stability performance, and can resist high temperatures of 251 DEG C or higher.

The invention relates to an uncoupling agent containing 2,4,5-trichlorophenol, a soluble metal salt and an adsorbent, wherein the soluble metal salt is soluble ferric salt and / or soluble aluminum salt. The invention also relates to the application of the uncoupling agent to an activated sludge method for the treatment of wastewater. In the process of the activated sludge method for the treatment of wastewater, the uncoupling agent provided by the invention can realize high COD removal rate and sludge reduction rate, and the water outlet has small TP concentration.

The invention discloses a new method suitable for large-scale high-efficiency purification of a water soluble quantum dot-streptavidin conjugate, and belongs to the field of biotechnology. In allusion to the disadvantages that a conventional quantum dot-streptavidin conjugate has complex purification process and low recovery rate and difficultly realizes large-scale production, single-terminal aminated polyethylene glycol (HO-PEG-NH3) is adopted to seal residual carboxyl of the quantum dot-streptavidin conjugate, a surface zeta potential of the conjugate is reduced; by adjusting the pH value of a solution to 4.5, the net charge content of the conjugate in the solution is further reduced, and the large-scale high-efficiency purification of the quantum dot-streptavidin conjugate is achieved by an ordinary high-speed centrifugation method. The method simplifies experimental operation procedures of the quantum dot-streptavidin conjugate, reduces requirements on separation equipment, is suitable for large-batch purification of the quantum dot-streptavidin conjugate, allows the yield to be more than 85%, and allows fluorescence characteristics and biological activity of the conjugate to have no significant changes.

The invention provides a water purifier and a preparation method thereof and relates to the technical field of water purifiers. The water purifier is mainly obtained by mixing a first component, a second component and a third component in a weight ratio of 1:3:(2-4); the first component comprises diallyl dimethyl ammonium chloride, benzoyl peroxide and acrylamide in a weight ratio of 1:0.1:(25-30); the second component comprises allyl chloride, ammonium persulfate and dimethylamine in a weight ratio of 1:0.1:(3-8); and the third component comprises an aluminum series water purification combination and an iron series water purification combination in a weight ratio of 1:(1-2). The water purifier provided by the invention has the characteristics of good water purification effect, no toxicity and low price and has higher market promotion value.

The invention belongs to the technical field of curing agents, and particularly relates to a high-humic-acid soil curing agent and a preparation method thereof. The high-humic-acid soil curing agent comprises substances in percentage by mass: 25%-40% of steel slag, 15%-25% of fly ash, 10%-15% of quick lime, 10%-20% of ordinary Portland cement, 6%-10% of an exciting agent, 1%-5% of an ion replacing agent, 1%-3% of a water repellent, 4%-6% of a retarder, 1%-2% of an early strength agent, 1%-3% of a filling agent, 1%-3% of a stabilizer, 1%-2% of an air entraining agent, 0.5%-1% of a water reducing agent and 0.5%-2% of a humic acid modifier. The high-humic-acid soil curing agent has the effects and advantages that the influence of humic acid on soil can be effectively reduced, the shear strength, the compressibility and the water stability of the soil are improved, the pore size, the compressibility and the permeability of the soil are reduced, and good economic and environmental benefits are achieved.

The invention belongs to the technical field of petrochemical engineering, and relates to a flocculating agent for oil-based drilling fluid and a preparation method of the flocculating agent. The flocculating agent is modified cationic polyacrylamide. The flocculating agent is prepared from the following raw materials in parts by weight: 40 to 60 parts of acrylamide, 5 to 15 parts of quaternary ammonium salt cationic monomer, 1 to 5 parts of sodium acrylate, 0.05 to 0.15 part of initiator, 0.1 to 0.5 part of sodium ethylene diamine tetracetate, 0.05 to 0.1 part of urea, 5 to 15 parts of surfactant and 30 to 60 parts of solvent. According to the flocculating agent for the oil-based drilling fluid and the preparation method of the flocculating agent, the flocculating agent for the oil-based drilling fluid can be better prepared, and the prepared flocculating agent for the oil-based drilling fluid can be rapidly dissolved and dispersed in an oil-based drilling fluid system and efficiently flocculates tiny solid phases in the oil-based drilling fluid.

The invention discloses a method for preparing modified flocculant from organic wastewater by diatomite and belongs to the technical field of organic wastewater treatment. The method uses diatomite asraw materials, SiO2 is extracted to synthesize sodium metasilicate pentahydrate, then polyaluminium ferric silicate is prepared, and carboxymethyl starch (CMS) is used for modifying the prepared polyaluminium ferric silicate (PAFCSC) flocculant to obtain the modified flocculant. The preparation of the flocculant by diatomite meets the requirement of comprehensive utilization of natural resources.Moreover, the demand for the flocculant is very high in China and even in the whole world, aluminum and iron flocculants occupy a large market because of good treatment effects and low cost, therefore, the preparation of the PAFCS flocculant by diatomite has great economic and social significance.

The invention discloses an aftertreatment method for Sr2Si5N8: Eu<2+> fluorescent powder. The aftertreatment method comprises the following steps: pickling treatment, surfactant solution treatment, coating treatment and drying and ball milling treatment. Fluorescent powder processed by the aftertreatment method has very good dispersity and moisture resistance, can be used for preparing white-light LEDs, reduce the back scattering power and improve the light extraction ratio, and is simple in process, low in cost and in favor of industrial production.

Methods and systems for enhancing of quality of liquid by treating a source liquid to enhance the concentration of low zeta potential crystals and produce a treated liquid having a higher concentration of low zeta potential crystals that that of the source liquid. The inventive system comprises an aqueous liquid source having a threshold concentration of selected minerals and a low zeta potential crystal generator for treating the aqueous source liquid to produce treated liquid having an enhanced concentration of low zeta potential crystals, and at least one filtration device for substantially removing bacteria, viruses, cysts, and the like from the treated source liquid.

The invention discloses a new method suitable for large-scale high-efficiency purification of a water soluble quantum dot-IgG monoclonal antibody conjugate, and belongs to the field of biotechnology. In allusion to the disadvantages that a conventional quantum dot-antibody conjugate has complex purification process and low recovery rate and difficultly realizes large-scale production, glucosamine is adopted to seal residual carboxyl of the quantum dot-antibody conjugate, a surface zeta potential of the conjugate is reduced; by adjusting the pH value of a solution to 4.5-5.0, the net charge content of the conjugate in the solution is further reduced, and the large-scale high-efficiency purification of the quantum dot-antibody conjugate is achieved by an ordinary high-speed centrifugation method. The method simplifies experimental operation procedures of the quantum dot-antibody conjugate, reduces requirements on separation equipment, is suitable for large-batch purification of the quantum dot-IgG monoclonal antibody conjugate, allows the yield to be more than 85%, and allows fluorescence characteristics and biological activity of the conjugate to have no significant changes.

The invention discloses a method for large-scale high-efficiency purification of a conjugate of water soluble iron oxide nanoparticles and an IgG monoclonal antibody, and belongs to the field of biotechnology. In allusion to the disadvantages that a conventional iron oxide nanoparticle-antibody conjugate has complex purification process and low recovery rate and difficultly realizes large-scale production, single-terminal aminated polyethylene glycol is adopted to seal residual carboxyl of the iron oxide nanoparticle-antibody conjugate, a surface zeta potential of the conjugate is reduced; by adjusting the pH value of a solution to 4.5-5.0, the net charge content of the conjugate in the solution is further reduced, and the large-scale high-efficiency purification of the iron oxide nanoparticle-antibody conjugate is achieved by an ordinary high-speed centrifugation method. The method simplifies experimental operation procedures of the iron oxide nanoparticle-antibody conjugate, reduces requirements on separation equipment, is suitable for large-batch purification of the iron oxide nanoparticle-antibody conjugate, allows the yield to be more than 90%, and allows optical characteristics and biological activity of the conjugate to have no significant changes.

A porous graphene polymer and its preparation method are disclosed. According to the preparation method, a graphene precursor is prepared by using anhydrous ethanol and auxiliaries, and inert gas is introduced into a reaction kettle and microwave pyrolysis is conducted to obtain graphene; by ultrasonic mixing of a sulfuric acid and nitric acid mixed solution and graphene, graphene oxide is prepared; and a polyferric chloride solution and a sodium borohydride aqueous solution are prepared, and the polyferric chloride solution and the sodium borohydride aqueous solution react with a graphene oxide solution which has undergone ultrasonic dispersion so as to obtain polyferric chloride cross-linked porous graphene polymer. The porous graphene polymer has large specific surface area, large contact area with a water body and strong adsorption capacity, and is easy to form flocculent precipitate with pollutants such as organic matter in water and the like. The product has stronger COD removal ability and can adsorb heavy metal, oil stain and organic matter to form flocculent precipitate. And pollutants are finally collected and removed through underwater extraction or air flotation.

The invention relates to an anionic trash catcher which is composed of following components, by weight, 0.4-6 parts of polyacrylamide, 0.3-6 parts of aluminum sulfate, 0.3-8 parts of polyethyleneimine, 0.1-0.8 parts of polydiallyldimethylammonium chloride and 0.4-7 parts of N-carboxymethylmethacrylamide. A high-molecular-weight high-positive-charge-density modified polyacrylamide-polyethyleneimine crosslinked copolymer novel anionic trash catcher can be employed in a situation that anionic trash accumulation and concentration is higher and higher since wet-end chemistry is quite complex due to increased closed circulating degree in paper machine white water and can reduce or eliminate interference by colloid solutes.

The invention discloses a method and a device for promoting free radical conditioning and pressure-vertical electric field dewatering of sludge through microelectrolysis. The method comprises main steps as follows: sludge is stirred, a direct-current electric field is applied, and iron powder and a conditioning agent are added for conditioning; the sludge enters a pressure-vertical electric fielddewatering device for dewatering. According to the method, the microelectrolysis process of an iron powder induction electrode is enhanced through the electric field, generation of Fe<2+> is promoted,activation of sulfate is realized, sulfate free radicals and high-valence iron ions are produced, electrolysis-oxidation-flocculation coordinated conditioning is performed on the sludge, the functions of cracking of the sludge structure, bound water release and floc reconstitution are played, and the dewatering effect of the conditioned sludge in the pressure-vertical electric field is enhanced.The dewatering efficiency is high, the water content of the sludge can be reduced to 50% or below, and the water content of the sludge is effectively reduced. Besides, the method and the device also have the advantages that the reaction time is short, operation is simple, the application range is wide and the like.

The invention discloses a method for preparing cellulose nanofibrils (CNF) by adopting polyatomic acid high-temperature short-time treatment, and belongs to the field of natural polymer materials. Inthe preparation process of CNF, chemical pulp is used as a raw material, cellulose is decomposed at high temperature for a short time by adopting binary or ternary organic acid, the Zeta potential ofthe cellulose is reduced, and the Zeta potential of the cellulose is further reduced through carrying out oxidation treatment on the pulp subjected to acidolysis; and finally, the oxidized slurry is subjected to high-pressure homogenization treatment, the CNF colloid with high dispersity is obtained, and the Zeta potential of the CNF colloid can reach -40 mV or above. The preparation process has good industrial implementation conditions, and the prepared CNF has the characteristics of high yield (more than 90%), good dispersibility, stable performance, large length-diameter ratio and the like,and has a good application prospect.