77results about How to "Strong electrostatic effect" patented technology

The invention relates to a multilayer electret nanofiber filtering material and a preparation method thereof. The invention adopted the technical scheme is as follows: through an electric-field stepped increasing/reducing technology, utilizing a combined needle head for electrostatic spinning to realize deposition of spinning polymer solution on a receiving substrate to obtain nanofiber, carrying out slight dissolving treatment on the surface of a nanofiber layer by a certain release rate by adopting a recovery solvent steam, wherein the nanofiber layer is uniformly filled with electret materials and the diameter of the nanofiber layer is distributed in a stepped-increasing or stepped-reducing manner along the direction vertical to the breadth. According to the multilayer electret nano-fiber filtering material, the electret charge stability is extremely high, the surface electrostatic potential is 250-7000V, simultaneously the filtering performance is excellent, the filtering efficiency for 0.03-10 microns particulates is more than 99.997%, the resistance pressure drop is less than or equal to 39Pa, the service life is long, and the development and application prospect in the aspect of filtering materials for air purifiers, window gauzes, masks and filtering papers and the like are wide.

The invention provides high liquid absorption rate acrylic acid water-absorbent resin and its preparation method and use. The high liquid absorption rate acrylic acid water-absorbent resin is prepared from acrylic acid, an alkali, water, a cross-linking agent, a high temperature-resistant foaming agent, a copolymerization monomer, a reducer and an initiator. A mass ratio of the acrylic acid, alkali to water is (25-45): (7-22): (33-68) and based on the acrylic acid mass, a use ratio of the cross-linking agent is in a range of 0.001-1wt%, a use ratio of the high temperature-resistant foaming agent is in a range of 0.01-2wt%, a use ratio of the copolymerization monomer is in a range of 0-10wt%, a use ratio of the reducer is in a range of 30-500ppm and a use ratio of the initiator is in a range of 0.001-1wt%. A high liquid absorption rate of the acrylic acid water-absorbent resin is 15-40s. The acrylic acid water-absorbent resin can be used as a liquid absorption material in fields of paper diapers, baby diapers and sanitary napkins in the health care industry and can also be used as a water absorption and storage material in industries of desert treatment, water blockage in an oil field and agricultural and forestall water retention.

The invention relates to a preparation method of a PANI/MXene/carbon cloth composite wave absorbing material. The preparation method comprises following steps: adding carbon cloth, which has been processed by an acid, into an MXene solution, stirring, adding the obtained MXene/carbon cloth composite material into an acidic solution containing aniline, which can adhere on the surface of the carboncloth, and carrying out polymerization reactions. The conditions of the preparation method are mild; and the obtained material is light and thin, has high flexibility and an excellent wave absorbing performance, can be cut to prepare shield layers of radar or electronic devices, daily protective materials, and protective clothing for special occasions, and has great market demand and a wide application prospect.

The present invention relates to a permanent antistatic polyvinylidene fluoride (PVDF) composition and a preparation method thereof. The composition comprises the following components, by weight, 68-99.4% of polyvinylidene fluoride, 0.5-30% of an ionic liquid antistatic agent, and 0.1-2% of other additives. During preparation, polycarbonate, a fluorine-substituted polyolefin additive and an ionic liquid are added to a banbury mixer to carry out melting blending at a temperature of 170-200 DEG C until mixing is uniform, the mixed material processed from the process is subjected to melting extrusion through a twin-screw extruder, and then granulation and drying are performed, wherein extrusion temperatures of various regions of the twin-screw extruder are maintained at a temperature of 160-190 DEG C. The composition has the following advantages that: 1, the product has good transparency and excellent antistatic property, and the antistatic property of the material is less affected by air humidity, and the resulting antistatic property is permanent, 2, the process is simple, processing is convenient, the use amounts of the ionic liquid antistatic agent and other additives are less, and the obtained PVDF composition has excellent mechanical properties, and 3, environmental protection requirements are met, the raw materials have characteristics of no toxicity and no harm, and no toxic element exists with chemical analysis.

The invention belongs to the field of environmental protection technology and denitration catalysis, and particularly relates to a flat-plate wide-temperature sulfur-resistant selective catalytic reduction (SCR) denitration catalyst and a preparation method thereof. A carrier of the catalyst provided by the invention is a titanium-cerium composite oxide hollow sphere, an active component of the catalyst is vanadium pentoxide, and catalytic auxiliary agents are ferric oxide, molybdenum trioxide and barium sulfate. A two-step rolling molding process is adopted, wherein the catalytic auxiliary agents are loaded on the surface of the titanium-cerium composite oxide hollow sphere by adopting an incipient-wetness impregnation method; then the catalyst active component vanadium pentoxide is loaded on the surface of the carrier; and the catalyst is molded into a flat plate shape through a rolling molding process, so that the flat-plate SCR denitration catalyst with a wide temperature and sulfur poisoning resistance is prepared. The catalyst has good catalytic activity and sulfur poisoning resistance in a range of 150-450 DEG C, can solve the problems of low activity and sulfur poisoning ofa catalyst in low-temperature flue gas and high SO2 oxidation rate in medium-temperature flue gas, and is suitable for denitration of wide-temperature sulfur-containing flue gas.

The invention relates to a preparation method of a modified chitosan papermaking sizing agent, and belongs to the technical field of papermaking. According to the preparation method, sodium periodateis utilized to selectively oxidize chitosan for forming aldehyde groups, the compounding performance with other natural biopolymers is enhanced, crosslinking with anhydride pre-modified collagen is carried out through a Schiff base reaction, and a reaction with -OH of paper cellulose is carried out for forming covalent bonds, so that paper has stronger waterproof performance, and the waterproof performance of the papermaking sizing agent is effectively improved. In addition, the prepared papermaking sizing agent is environmentally friendly and easily biodegradable, and can be compounded and used with other synthetic papermaking sizing agents, so that the sizing effect is increased while the environmental pollution is reduced. The cation property in the sizing agent provided by the invention enhances the binding force with ink, and remarkably improves the printing quality of paper and the water washing resistance of printing ink. Compared with polyvinyl alcohol size press coated paper,the size press coated paper treated with the sizing agent has reduced water washing chromatic aberration of paper printing, increased printing color lump density, and excellent tone reproduction of print products.

The invention belongs to the field of environment science and engineering, and discloses a method for removing tetracycline by using an aluminum-based metal organic framework/graphene oxide compositematerial. By using the method, the aluminum-based metal organic framework/graphene oxide composite material is uniformly scattered into a water body containing tetracycline; the pH is regulated to 2 to 11; adsorption is performed. The composite material is positively charged; the tetracycline is negatively charged in water solution; a strong static electricity effect can be formed between adsorbents and adsorbates; secondly, the compact hexangonal carbon atom plane of the graphene oxide can generate pi-pi effect with benzene rings on the tetracycline; the adsorption is enhanced; next, the metal aluminum ions in the composite materials can form Al-N covalent bonds with nitrogen atoms on the tetracycline; the adsorption action force can be further reinforced. Through the cooperated effect among three parts, the prepared aluminum-based metal organic framework/graphene oxide composite material has the strong adsorption and high adsorption volume on the tetracycline in water.

The invention discloses a nano-polymer antibacterial agent and a preparation method thereof. A nano polymer product with an antibacterial function is directly obtained by using an organic nano technology of emulsion polymerization via a one-step process. The obtained product has large specific surface area and high utilization rate, the particle size of the obtained product is within the range of 40-90nm; meanwhile, the antibacterial agent contains positive charges at the surface; harmful microbe can be firmly captured; the physiological process is interfered; a long fatty chain at the surface of the antibacterial agent punctures and destroys a cell wall, thereby resulting in death. Thus, the broad-spectrum efficient antibacterial effect is achieved, and the nano-polymer antibacterial agent has the characteristic of contact sterilization. In addition, the product disclosed by the invention is stable in structure, not easy to migrate, easy to disperse, good in compatibility with a polymer material, wide in application range and low in cost.

The invention relates to a hot-melt granulation method of pharmaceutical adjuvant of a controlled/slow-released agent, in particular a hot-melt granulation method of carbomer. The method comprises the following steps: heating powdery carbomer until the temperature of the powdery carbomer is between the melting points of wax granules and the glass transition temperature of the carbomer; and then, adding the wax granules with predetermined grain size, and stirring at a low speed, so that the carbomer is gradually uniformly attached on the surfaces of the wax material granules, and the novel pharmaceutical adjuvant, namely carbomer, of the controlled/slow-released agent is obtained. Since the grain size of the granules formed by the carbomer and wax materials is associated with the grain size of the wax materials and since the grain size of the wax materials is controllable, the grain size of the finally prepared carbomer granules is controllable as well.

The invention provides a three-quaternary ammonium salt compound for mineral flotation, and belongs to the technical field of beneficiation. The three-quaternary ammonium salt compound expressed as the formula I is used as a collecting agent in the reverse flotation desiliconization decontamination of phosphorus ores, iron ores and bauxites, the ore flotation of lepidolite or the flotation separation of potassium chloride and sodium chloride. FORMULA; in the formula I, R1 and R2 are alkyls with 7-20 carbons; R3, R4, R5, R6, R7 and R8 are selected from methyl, ethyl, -(CH2CH2O)nH or -(CH(CH3)CH2O)nH, wherein n is 1-6; R9 and R10 are alkylene with 2-6 carbon atoms; and X is Cl, Br or I. The three-quaternary ammonium salt compound serves as the collecting agent, and molecules thereof contain three mineral loving radicals, so that the electrostatic effect on the surfaces of minerals is higher, and the selectivity of target minerals is better; the three-quaternary ammonium salt compound has multiple hydrophobic radicals to improve the dewatering capacity of the collecting agent and to achieve higher collecting capacity of the target minerals; and compared with a flotation collecting agent generally used in the prior art, the flotation efficiency and the recovery rate can be effectively improved.

The invention provides a preparation method of a high-performance mesoporous silica-chitosan composite antibacterial filter. The preparation method comprises the following steps: (1) firstly, uniformly mixing a glacial acetic acid aqueous solution with chitosan to prepare a chitosan-acetic acid solution, then mixing and stirring the chitosan-acetic acid solution with 3-glycidyl ether trimethoxysilane overnight, adding mesoporous silica powder into the overnight solution, stirring and centrifuging, and then washing with ultrapure water to obtain a chitosan-mesoporous silica composite material;and (2) adding water into the chitosan-mesoporous silica composite material prepared in the step (1) to prepare a solution with the concentration of 100g/L, compounding the solution with a non-woven fabric, carrying out pre-drying and baking treatment on the composite sample, and carrying out ultraviolet curing to prepare the antibacterial filter. According to the prepared filter, the antibacterial rate reaches 90% or above, meanwhile, ultrafine particles in air can be effectively filtered out, and the effective haze prevention effect is achieved.

The invention discloses an anti-fouling hollow fiber membrane and a preparation method of the anti-pollution hollow fiber membrane, and provides a hollow fiber membrane capable of resisting fouling of colloidal substances and protein, and the preparation method of the hollow fiber membrane. The preparation method comprises the steps of fully mixing 1-3% of sodium polyacrylate and 3-5% of water, then fully mixing 15-20% of a polymer, 63-65% of a film formation solvent and 10-15% of a film formation additive with the above mixture, removing air bubbles to obtain casting film liquid, extruding the casting film liquid by a spinning nozzle, then enabling the casting film liquid to enter a coagulating bath at 60-80 DEG C, drying at 80-100 DEG C after coagulating for certain time, so as to obtain the anti-fouling hollow fiber membrane, wherein the coagulating bath is aqueous solution containing sodium polyacrylate cross-linking agents. The hollow fiber membrane can effectively reduce nonspecific binding of membrane surface and pollutants such as protein and colloid through a hydrophobic bond, and reduces the membrane surface adsorption, so that the membrane flux is relatively stable and the attenuation rate is reduced.

The invention relates to an ultrahigh-temperature-resistant and complex-salt-resistant amphoteric ion hydrophobic association polymer filter loss reducer and a preparation method thereof. The filter loss reducer is a multipolymer with amphoteric ion hydrophobic association characteristic and is generated by performing polymerization reaction on hydrophobic alkylamide, strong hydrophilic anion alkenyl sulfonate and strong hydrophilic cationic alkenyl quaternary ammonium through a water-soluble azo initiator in an aqueous solution, wherein the generated multipolymer molecular chain contains about 2,000 to 4,000 structural units, and the weight-average molecular weight range is 1,320,000 to 2,100,000. The multipolymer filter loss reducer has high compatibility in an ultrahigh-temperature water-based drilling fluid well completion fluid, can obviously reduce the filter loss quantity of the drilling fluid well completion fluid under the ultrahigh-temperature environment, has temperature resistance capable of reaching 248 DEG C, saturated sodium chloride resistance and excellent complex salt resistance, and can obviously reduce the filter loss quantity in the water-based high-temperaturedrilling fluid with the chloridion concentration higher than 100,000 ppm, calcium ion concentration higher than 5,000 ppm and magnesium ion concentration higher than 5,000 pmm and invaded with acidicgas.

The invention discloses a polypeptide and application thereof. The polypeptide contains a sequence represented by formula (I) or salt: P<1>-Ala-Gly-X1-Ala-X2-X3-X4-P<2>. By inhibiting the interaction of proteins APC/Asef in a cancer cell, an anti-tumor effect is achieved. The anti-tumor polypeptide has wide spectrum property and is capable of inhibiting and killing multiple cancer cells, short in peptide chain length, high in anti-tumor activity, stable and unlikely to be inactivated.

The invention discloses application of a metal dendritic crystal inhibition additive, an electrolyte containing the same and a battery. The dendritic crystal inhibition additive provided by the invention is used as an additive of an electrolyte of a metal-based battery. The additive comprises a compound with an electrophilic group in a molecular structure or capable of dissociating organic cationsin the electrolyte. The metal-based battery containing the metal dendritic crystal inhibiting additive is provided, in the charging process of the battery, electrophilic groups in the additive or organic cations dissociated after being dissolved in electrolyte can be adsorbed on the small bulges on the surface of a metal negative electrode under the action of electrostatic force, and metal ions are prevented from being deposited on the small bulges, so that the growth of dendrites is inhibited, the service life of the battery is prolonged, and the coulombic efficiency of the battery is improved.

The invention discloses a textile anti-creasing agent. The textile anti-creasing agent is prepared from the following raw materials in parts by weight: 8 to 15 parts of epichlorohydrin, 10 to 20 partsof fatty alcohol polyoxyethylene ether, 3 to 8 parts of amino silicone oil, 12 to 18 parts of water-soluble polyurethane resin, 20 to 30 parts of ammoniated epoxy resin, 15 to 25 parts of lactic acid, 10 to 15 parts of aluminum acetate, 25 to 40 parts of ethanol, 18 to 35 parts of dimethylol dihydroxyethylene urea, and 300 to 600 parts of water. The textile anti-creasing agent has a lasting anti-creasing effect, does not release formaldehyde harmful to human bodies, and has a small change in original breaking strength, and a texile has a good handfeel after the textile anti-creasing agent isused.

The invention provides a modified coco coir loaded nano zero-valent iron composite material. Modified coco coir is used as a loading base material; nano zero-valent iron is embedded in pores of the modified coco coir, gelatin colloid wraps the nano zero-valent iron, and a preparation method comprises the following steps: 1) selecting coconut shells, cleaning the coconut shells with water, and crushing the coconut shells into particles with a certain particle size by adopting a crushing machine; 2) drying the obtained coco coir, and putting the coco coir into a microwave expansion furnace for puffing treatment to obtain puffed coco coir; 3) adding a FeSO4 solution according to a certain weight ratio, adding an organic solvent and a dispersing agent, and uniformly stirring; 4) adding a certain amount of NaBH4 into the solution obtained in the step 3), quickly stirring, and filtering; 5) washing the obtained composite material with deionized water and an organic solvent respectively, andthen putting the composite material into a vacuum drying oven for drying to obtain the composite material. The coco coir used in the method is wide in source, and the method is easy and convenient tooperate, low in cost, capable of effectively treating low-concentration uranium-containing wastewater and suitable for large-scale production, and is suitable for large-scale production.

The invention provides a polypyrrole modified magnetic kaolin nano composite material as well as a preparation method and application thereof, and belongs to the technical field of magnetic nano composite materials. The preparation method provided by the invention comprises the following steps: mixing first ferric chloride, sodium acetate, kaolin, polyether polyol and ethylene glycol, and carryingout hydrothermal reaction to obtain magnetic kaolin; and mixing the magnetic kaolin, sodium dodecyl benzene sulfonate, water, pyrrole and second ferric chloride, carrying out polymerization reaction,and sequentially washing and drying the polymerization reaction product to obtain the polypyrrole modified magnetic kaolin nano composite material. The polypyrrole modified magnetic kaolin nano composite material prepared by the invention has extremely high removal efficiency on heavy metal ions and organic pollutants in a water body, can remove various coexisting heavy metal ions at the same time, and can be repeatedly used for many times.

The invention discloses a chitosan-based amphiphilic self-assembling nano carrier and a preparation method and an application thereof. The nano carrier is mainly chitosan, and an amino group of chitosan is respectively connected with histidine (His) and vitamin E succinate (VES); and the chitosan-based amphiphilic self-assembling nano carrier can be used for the preparation of a hydrophobic drug carrier. The average particle diameter of the nano carrier prepared by the invention is 172.1+/-44.17 nm, PDI is 0.349, and the surface zeta potential is +49.5+/-5.96 mV; the encapsulation efficiency of drug-loaded nanoparticle DOX/VCH drug doxorubicin after drug loading is 66.64%, and the drug loading is as high as 21.04%; the nano carrier has good anti-tumor effect in functional experiments in vitro and in vivo: the tumor inhibition rate in vitro is 56.27% at 24 h, and the tumor inhibition rate is 45.81% in 12 days.

The invention belongs to the technical field of polymer membrane materials, and provides a polyvinyl imidazole functionalized polysulfone micro-filtration membrane and a preparation method and application thereof in order to solve the problems of low chromate and arsenate ion filtering efficiency and the like of an existing porous membrane. A polysulfone membrane is used as a base membrane, and anaromatic tertiary amine group is bonded to the surface of the polysulfone membrane after chloromethylation modification; then the base membrane is placed into a dimethylformamide solution containinga vinyl imidazole monomer and an oil-soluble initiator, and graft polymerization is conducted on the surface of the membrane under the action of a redox type surface initiation system consisting of aromatic tertiary amine and BPO or AIBN, so as to obtain the polyvinyl imidazole functionalized polysulfone micro-filtration membrane PSF-g-PVI. The preparation method is simple and easy to operate. Themicrofiltration membrane has a strong adsorption effect on chromate anions and arsenate anions, and toxic anions are effectively removed by taking the adsorbent as a filter membrane to perform a membrane separation process. The microfiltration membrane is a microporous filter membrane, has high flow rate, and has excellent mechanical properties, thermal stability, chemical stability and the likeof the polysulfone membranes.