303results about How to "Improve chemical reactivity" patented technology

A preparation method of a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material includes: (1) etching Ti₃AlC2 with LiF/HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material. A method for degrading and removing organic pollutants in water includes (1) etching Ti₃AlC₂ with LiF/HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material; (4) placing the two-dimensional nitrogen-doped carbon-based titanium dioxide composite material into water containing organic pollutants to degrade and remove organic pollutants in water.

The invention discloses a method for preparing nanometer microcrystalline cellulose by combining acid hydrolysis and ultrasonic treatment. The method comprises the following steps of: preparing a sulfuric acid solution with certain concentration; slowly adding tonnor EM100 powder, which is provided by Shanghai Tonnor Material Science Co., Ltd, to the sulfuric acid solution while stirring; ultrasonically treating for certain time after the tonnor EM 100 powder is completely dissolved; adding a certain amount of distilled water to stop the reaction after the ultrasonic treatment; carrying out centrifugal separation onto the obtained mixed solution; dialyzing the collected nanometer microcrystalline cellulose colloid until the collected nanometer microcrystalline cellulose colloid is neutral; and finally refrigerating and freeze-drying the dialyzed nanometer microcrystalline cellulose colloid to obtain the nanometer microcrystalline cellulose powder. The method for preparing nanometer microcrystalline cellulose by combining acid hydrolysis and ultrasonic treatment is simple to operate, free of damages to the cellulose degradation and easy to control; and more importantly, the environment pollution can be reduced in comparison with the pure acid hydrolysis.

The invention discloses a method for quickly forming a soft power lithium-ion cell. The method comprises the following steps: (S1) supplying a heat source for heating a cell by using a heating plate;(S2) driving a pressurizing plate to pressurize the cell by using a servo motor; (S3) performing gradient charging on the cell; and (S4) charging the cell till reaching high charge state. According tothe invention, a stable, compact and uniform SEI film is formed on a cathode surface, the performance of the lithium-ion cell is greatly promoted, the early failure of the lithium-ion cell in the circulating process is avoided, the yield of the cell is increased, the cell quality is optimized, the forming time of the cell is shortened, the large-scale production of the cell is realized and the method has wide application prospect.

The invention provides high-flowability pregelatinized starch and a method for preparing the same by mechanical activation, which belong to the technical field of starch modification processing. The method comprises the following steps: uniformly mixing starch and a certain amount of flow aid in a high-speed mixer uniformly, pre-drying the starch by using heat generated in a high-speed mixing process, and controlling the water content in the starch to be lower than 15 percent; and placing the uniformly mixed materials in a ball mill containing a milling medium, well regulating the temperature for constant-temperature dissolution in water, performing mechanical activation for a certain time period, taking the starch out, and sieving the starch with a 80 to 100-mesh sieve. The method has the advantages of simple process and equipment, small investment, environmentally-friendly process, low production cost, easy product quality control and the like. The prepared product has the characteristics of high flowability, loose structure, uniform particles and precision control over pregelatinization degree and can be widely used in industrials and fields of foods, pharmaceuticals, chemicals and the like.

The invention discloses a Fe/C composite porous structure material as well as a preparation method and application thereof. The Fe/C composite porous structure material is characterized by being prepared from low-grade sedimentary iron ore and biomass as raw materials in manners of crushing, mixing, extrusion molding and pyrolysis and reduction reaction in the presence of hydrogen atmosphere at 650-900 DEG C, wherein the main phase composition comprises biomass carbon and zero-valent iron. The Fe/C composite porous structure material disclosed by the invention is high in opening porosity, magnetic susceptibility, adsorbability and biological chemical activity, can be used for treating eutrophicated river water, living sewage and landscape water bodies, or can be used for mediation of underground water pollution and polluted soil.

The invention relates to an Al-Ga-In-Sn-Zn alloy as well as a preparation method and an application thereof. The alloy is prepared from the following components by weight percent according to a mechanical alloying technique: 45-97wt% of metal Al, 1-20wt% of metal Ga, 0.5-15wt% of metal In, 1-10wt% of metal Sn and 0.5-10wt% of metal Zn. The alloy of the invention can directly react with water at the temperature of larger than or equal to zero DEG C so as to realize the effect of rapidly producing hydrogen; and hydrogen-producing rate reaches more than 90% of a theoretical value, and the reaction rate reaches 200ml/min.s, thereby meeting the dynamic powder requirement of hybrid electric vehicle travelling and greatly improving the utilization rate of gasoline.

The invention discloses a carboxylic oxidized graphene preparing method and a method for modifying a release film by means of carboxylic oxidized graphene. According to the carboxylic oxidized graphene preparing method, oxidized graphene solution is used as the raw material, amino acid serves as the carboxylation reagent, the ph value of a reaction system is adjusted to be alkaline, heating reaction is conducted for a while, then natural cooling and dialysis are conducted in sequence to remove foreign ions, and then carboxylic oxidized graphene solution is obtained. When the carboxylic oxidized graphene solution is used for modifying a functional layer of the organic release film, carboxylic oxidized graphene is used as a modifier, and the surface functional layer of the organic release film is modified through chemical blending modification, interfacial polymerization modification, surface graft modification or self-assembly modification. Oxidized graphene with higher carboxyl functional group content can be obtained, higher hydrophilia, solubility, electric charge property and chemical reactivity of oxidized graphene can be realized through higher carboxyl content, and then the release film has higher permeability, entrapment property and hydrophilia.

The invention discloses a matte brick stain-proofing agent. The matte brick stain-proofing agent is prepared from a component A, a component B and a component C, wherein the component A is an organic solvent, the component B is silicon resin, and the component C is at least one of silicone oil and organosiloxane monomers. The invention further provides a preparation method of the matte brick stain-proofing agent. By compounding the components, the matte brick stain-proofing agent can achieve a good stain-proofing effect when used for performing stain-proofing treatment on the surfaces of matte bricks in follow-up application; besides, the matte brick stain-proofing agent has a very long shelf life and service life; moreover, the preparation technology is simple and easy to implement and can be conveniently applied to industrial production.

The invention relates to a normal temperature cured flexible epoxy composition for thin layer paving of road and bridge surfaces. The composition is prepared from a component A and a component B in a mass ratio of (1-2): 1. The component A comprises 10-100 parts by mass of flexible epoxy resin, 0-80 parts by mass of standard epoxy resin, 2-10 parts of a diluent and 5-10 parts by mass of a curing accelerant a; the component B comprises 40-100 parts by mass of a modified amine curing agent, 10-70 parts by mass of a toughening modifier, 1-10 parts by mass of a curing accelerant b, 1-3 parts of a coupling agent and 0.1-1 part of a defoamer. The invention further relates to a preparation method for the normal temperature cured flexible epoxy composition for thin layer paving of road and bridge surfaces. The normal temperature cured flexible epoxy composition for thin layer paving of road and bridge surfaces provided by the invention has the benefits of being good in flexibility, high in ductility, curable at normal temperature, convenient to construct, low in cost and the like.

The invention provides a device and a method for integrally treating oily sewage at the bilge of a ship. Oily sewage at the bilge enters into a regulating pool by passing through a collection pipeline and a grid and then enters into a flocculation reaction pool, coagulant polymerization and coagulant aids are respectively fed into the flocculation reaction pool by a reagent feeder, an agitator is arranged on the flocculation reaction pool, the oily sewage enters into a gravity type oil-water separator after being flocculated, an oil scraper is arranged on the upper part of the gravity type oil-water separator, an oblique plate structure is arranged on the lower part, the oily sewage at the bottom is collected by a sewage hopper and discharged by a blowdown pipe controlled by a blowdown valve, the oily sewage to be treated after being subjected to separation action of the gravity type oil-water separator enters into a membrane separation unit, ultrafiltrated concentrated water is discharged by a drain pipe, and a backwashing device is arranged on the membrane separation unit. By using the device and the method, the volume of a sewage storage cabinet in the ship can be saved, consumption of raw materials can also be reduced, recovery of oil resources and continuous use of treated sewage are realized, and the purposes of saving energy and reducing emission are achieved.

The invention discloses modified starch and a manufacturing method and application of the modified starch. The manufacturing method of the modified starch provided by the invention comprises the following steps: dispersing starch by an organic solvent, adding water and uniformly mixing to prepare a starch suspension, and performing the microwave or the ultrasonic treatment to obtain the modified starch. According to the invention, crystalline regions in modified starch granules are greatly reduced, and the crystallinity of the modified starch granules is decreased from 15-45% to 8-30%. After the crystallinity is decreased, cassava starch is used for manufacturing dialdehyde starch, hydroxypropyl starch and octenyl succinic anhydride starch ester and has obviously improved reactivity.

The invention provides a preparation method of lignin phenol resin prepolymer, which comprises the following steps: mixing lignin compound, phenolic compound and acid catalyst, and heating the mixture to be 180 to 350 DEG C for reaction so as to obtain mixed reaction liquid; and mixing the mixed reaction liquid with formaldehyde, and obtaining lignin phenol resin prepolymer after condensation polymerization. According to the invention, the phenolic compound is used as a solvent, double bonds and ether bonds on the phenolic compound are destroyed through an acid environment provided by the acid catalyst under a high temperature condition of 180 to 350 DEG C, so that the molecular weight of the phenolic compound is reduced; and while a phenol molecule is connected to the hydroxymethyl active group on a lignin, so that the chemical reactivity of a lignin molecule is improved, and the reactivity of the lignin phenol resin prepolymer is improved. Therefore, the obtained lignin phenol resin has good mobility, good heat resistance and high strength.

The invention discloses an electrolyzed seawater hydrogen production catalyst based on a MXene and transition metal carbide composite nanostructure and a synthesis method thereof, and belongs to the field of nanomaterials and catalysis. The catalyst consists of MXene of coating transition metal carbide nanoparticles by uniform-loaded nanocarbon. The preparation method comprises the following steps: the MXene, metal salt, pH buffer solution and a carbon source precursor are dissolved and mixed uniformly for centrifugation, washing, freezing and drying to obtain a mixture, and are calcined at high temperature in an inertia atmosphere to obtain a structure and component-controllable two-dimensional nanostructure electrocatalyst. The electrocatalyst can overcome the problem of reduction of performances caused by agglomeration and sintering of nanoparticles in the preparation and reaction process of trasition metal carbides, and solves the basic difficulties perplexing the performance exertion and application of the transition metal carbide nanocatalyst; and under the condition of approaching neutrality, excellent catalysis activity and stability are achieved on electrolyzed seawater hydrogen production, and the foundation is laid for wide application of the electrolyzed seawater hydrogen production technology.

The invention provides a modified rubber V belt made of nano-material, which comprises rubber matrix, vulcanizing agent, accelerators, stearic acid, antioxidant, softener and carbon black, and comprises further nano-zinc oxide and nano-calcium carbonate. The product is made with 2.5 to 10 portions of the nano-zinc oxide and 5 to 50 portions of nano-calcium carbonate on the basis of 100 portions of rubber matrix. Mechanical property, wear resistance, compression set and tearing property of the rubber can be improved obviously and the performance of the finished product is improved with indirect zinc oxide being replaced by the nano-zinc oxide, soft semi reinforcing carbon black being replaced by the nano-calcium carbonate.

The invention provides a method for preparing zinc oxide nanometer hollow spheres in caustic corrosion reaction. The method is mainly characterized in including using the solution of Zn(Ac)2 as the initial reactant first, adjusting the pH value to 11.5-14 by adding ammonia, using ethanol as the solvent, finally forming the nanometer hollow spheres in the hydrothermal reaction between Zn(NH3)4<2+> and excessive ammonia at a high temperature. The entire reaction has simple material, easy operation, no need for any complex instrument processing, convenience and rapidness, which is a method of rapidly preparing the zinc oxide nanometer hollow spheres. The obtained hollow spheres have narrow size distribution and good dispersibility with an external diameter of 600 nm and an internal diameter of 200-300 nm. The caustic corrosion reaction is adopted to synthesize zinc oxide nanometer hollow spheres in the method, thus agglomeration phenomenon caused by an aging machine is obviated, complex operation steps of organic reaction synthesis, contamination and disturbance to objective material zinc oxide caused by the complex operation steps are obviated. The method is obviously characterized in high production rate, rapidness, easiness, convenient operation, low cost and environment friendliness.

The invention discloses a preparation method of a fluoride anti-fingerprint agent. Perfluor alkyl alcohol and carbimide alkyl trialkoxysilane are used as reaction substrates, and addition reaction is carried out to prepare a crude product; the superfluous carbimide alkyl trialkoxysilane is removed through reduced pressure distillation, and a fluoride anti-fingerprint agent concentrated solution is obtained; and the fluoride anti-fingerprint agent concentrated solution is diluted by 1,1,2,2- tetrafluoride ethyl methyl ether, and a final product that is the fluoride anti-fingerprint agent is obtained. The reaction condition of the method is mild, a noble metal catalyst is not needed, irritant and corrosive materials are not used, the process safety is good, the cost of production is low, and the method is conducive to industrial production.