46results about How to "Achieve grafting" patented technology

The invention provides a three-dimensional mixed conductive adhesive used for lithium battery, and a battery containing the adhesive. The adhesive contains a carbon nanotube, a graphene and a polymerhaving a chemical bonding effect with the carbon nanotube and the graphene. The carbon nanotube and the graphene in the adhesive are mixed according to a certain proportion to form a three-dimensionalconductive network; polymer groups and groups on the graphene carbon nanotube are effectively combined to improve the intensity of the compound; and the compound is perfectly dispersed when the electrode slurry is prepared. During the charging-discharging process, the three-dimensional compound conductive adhesive is capable of better controlling the expansion and the shrinkage of the active material of the electrode plate, and effectively improves the cycling stability and the rate capability of high-capacity high-volume-change type electrode material, such as the silicon-based cathode material, the tin-based cathode material, and the high-volume-change type electrode material that can be expanded into the new battery system in the future.

The invention discloses a citric acid and chitosan modified biocompatible polyurethane and a preparation method thereof. A main chain of the polyurethane disclosed by the invention is a polyurethane long chain, the two ends of the long chain are respectively an anticoagulative citric acid structure covalently grafted with the long chain, and a chitosan structure is selectively grafted on the citric acid structure. The preparation method comprises the following steps: firstly, adding isocyanate, polyethylene glycol and a catalyst into a reactor, and carrying out stirring reaction for 2-5 h in the presence of nitrogen; then, adding a citric acid, and heating for reacting for 12-18 h, so that a citric acid modified polyurethane is obtained; and activating the citric acid modified polyurethane by using carbodiimide, and soaking the obtained object into a chitosan-acetic acid solution to carry out acid-amide condensation reaction, so that the modified biocompatible polyurethane is obtained. According to the citric acid and chitosan modified biocompatible polyurethane disclosed by the invention, the citric acid structures with biocompatibility and the chitosan structure are covalently bonded in the polyurethane long chain, so that the polyurethane has good chemical stability and biocompatibility, and can be used as a biomedical material; and the preparation method has the advantages of simple and easily-controlled process, low cost, and the like.

The invention discloses a mono-component polymeric nanocomposite superhydrophobic coating material and a preparation method therefor. The method mainly comprises the following steps: uniformly mixingspherical silicon dioxide sol with gamma-aminopropyl triethoxysilane and octadecyl methoxy silane, and then, carrying out purifying and drying, so as to obtain hydrophobic spherical silicon dioxide; then, adding and dissolving the hydrophobic spherical silicon dioxide in N-N dimethylformamide, then, sequentially adding triethylamine and a halogenation reagent, and carrying out uniform mixing, so as to prepare hydrophobic spherical silicon dioxide, of which the surface contains halogen groups; and then, preparing a hydrophobic-modified spherical silicon dioxide particle brush from the hydrophobic spherical silicon dioxide, of which the surface contains the halogen groups, by an atom transfer free-radical polymerization method, thereby preparing the mono-component polymeric nanocomposite superhydrophobic coating material. The superhydrophobic coating material prepared by the method not only has superhydrophobic and self-film-forming properties, but also is high in substrate bonding power, good in durability and long in service life.

The invention discloses a straw-based hydrogel adsorbent for efficiently removing heavy metal ions and a preparation method of the straw-based hydrogel adsorbent. The preparation method comprises thefollowing steps: immersing straw powder into a modification solution for modification so as to obtain modified straw immobilized by an initiator; grafting an acrylonitrile polymer on the surface of the modified straw by adopting an atom transfer radical polymerization process, and preparing acrylonitrile polymer modified straw-based hydrogel by virtue of a cross-linking agent; and adding the straw-based hydrogel into an amination reagent for modification to prepare the straw-based hydrogel adsorbent. The straw-based hydrogel adsorbent prepared by the preparation method disclosed by the invention can be used for efficiently removing heavy metal ions, and meanwhile, the straw-based gel serving as the adsorbent is also easily removed from a purified water body environment.

The invention discloses low-cost flame-retardant polyimide heat insulation foam and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing a phosphorus-based liquid flame retardant and a polyol surfactant, adding a catalyst, and conducting an ester exchange reaction to synthesize a phosphorus-containing polyol flame retardant; S2, mixing a pyromellitic diester solution, a foam stabilizer, a compound catalyst and a foaming agent to obtain a foaming white material; S3, stirring and mixing the phosphorus-containing polyol flame retardant andisocyanate, and carrying out a room-temperature prepolymerization reaction to obtain a phosphorus-containing foaming black material; S4, stirring and mixing the foaming white material and the foamingblack material to a uniform state at a high speed to obtain foaming slurry; and S5, pouring the foaming slurry into an open mold, carrying out a free foaming molding process to obtain a polyimide foam intermediate, and curing the foam intermediate after the foam intermediate is shaped. The obtained polyimide foam has good flame retardant property and can improve safety performance and heat insulation performance, so that the polyimide foam can be used for preparing a wall heat insulation material.

The invention belongs to the field of modification of Mxene materials, and discloses an Mxene material with an organic chelating functional group grafted on the surface, the Mxene material is combined with a grafting agent through a silicon-oxygen bond, and the grafting agent contains amino and/or carboxyl as the organic chelating functional group. The invention also discloses a preparation method of the Mxene material. The preparation method comprises the following steps: S1, dispersing Mxene powder in an organic solvent to obtain a suspension I, and adding the grafting agent into an organic solvent to obtain a solution II; and S2, adding the solution II into the suspension I, carrying out stirring reaction under an ultrasonic condition, then separating out a solid, and carrying out cleaning and drying to obtain a product. The preparation process is controllable and simple, operation is easy and convenient, the material is good in morphology and structure, the number of chelating functional groups grafted on the surface is considerable and uniform, and the material serving as a capacitive deionization electrode material is excellent in heavy metal ion and radioactive ion removal performance, so that efficient treatment of water is achieved, the material can be regenerated and recycled, and large-scale industrial production and application prospects are achieved.

The invention relates to the field of composite material preparation, in particular to a starch grafted coal gangue coated nano zero-valent iron composite material and a preparation method thereof. Inthe reversed-phase suspension polymerization, a reversed-phase suspension polymerization system consists of a water phase and an oil phase; the water phase is composed of water, starch, an initiator,a cross-linking agent, a polymeric monomer, ferrous sulfate heptahydrate, potassium borohydride and a surfactant, and the oil phase is composed of a dispersing agent; the volume ratio of the water phase to the oil phase is 1-5. The composite material obtained by the invention not only has good adsorption capacity of coal gangue, but also fully utilizes a complex three-dimensional network structure and various active functional groups of starch to stabilize and disperse nano zero-valent iron, can effectively prevent the oxidation of the nano zero-valent iron, and has a good treatment effect onCr (VI) containing water.

The invention relates to a titanium boride surface modification method, particularly a treatment method for modifying a titanium boride ceramic surface by using a silane coupling agent. The method is characterized by comprising the following steps: 1) surface oxidation etching of titanium boride ceramic: carrying out ultrasonic oscillation in acetone, putting in a muffle furnace, and carrying out oxidation etching until the surface of the ceramic wafer is oxidated to form TiO2; 2) hydrolysis of silane coupling agent: uniformly mixing alcohol and deionized water to obtain an alcohol water solution, and adding a silane coupling agent; 3) application of silane coupling agent to titanium boride ceramic surface: uniformly spreading the obtained silane coupling agent solution on the titanium boride ceramic surface subjected to oxidation treatment by using a brush, completely covering the ceramic wafer with a polypropylene film, and keeping the temperature at 50-70 DEG C for 3-5 hours; and removing the polypropylene film, naturally drying at room temperature in the shade, cleaning the ceramic wafer with ethanol, and drying. The coupling-agent-applied titanium boride ceramic has obviously higher bonding property with organic resins.

The invention discloses a method for carrying out antibacterial and antioxidant finishing on damask silk by an enzyme method, and belongs to the technical field of textile dyeing and finishing. The method comprises the following steps of: firstly, impregnating damask silk fabric in a catechin and chitosan oligosaccharide mixed solution, then adding laccase into a system, and by virtue of the catalytic oxidation effect of the laccase, realizing the polymerization of tyrosine in real silk and phenolic hydroxyl in catechin and the Schiff base reaction of the tyrosine in the real silk and amino onchitosan oligosaccharide, thus realizing the antibacterial and antioxidant finishing of the damask silk by the enzyme method. The method specifically comprises the following steps of: (1) adsorbing the catechin and the chitosan oligosaccharide by the damask silk; and (2) catalyzing the damask silk to graft the catechin and the chitosan oligosaccharide by the laccase. Compared with a method for carrying out chemical finishing on the damask silk by a high-temperature baking crosslinking method, the method disclosed by the invention has the advantages of lower production energy consumption, goodantibacterial and antioxidant effects and less yellowing and strength loss of damask silk fabric.

The invention discloses an elastic solid electrolyte material and a preparation method thereof. The elastic solid electrolyte material comprises a rubber matrix and a metal salt, the metal salt is dispersed in the rubber matrix, the rubber matrix is obtained by reaction of a rubber material and an ionic liquid, the rubber material and the ionic liquid both contain unsaturated chemical bonds, and molecules of the ionic liquid are grafted on a molecular chain of a rubber material through addition reaction of unsaturated chemical bonds to obtain a rubber matrix. On one hand, the characteristic of high elasticity of a rubber material is reserved, and on the other hand, the composite material also has excellent ion conduction performance and is particularly suitable for preparing a flexible or foldable solid-state battery, and the application range of the solid-state battery is greatly expanded.

The invention relates to sesame oil and specifically discloses a preparation method of high-quality sesame oil. The preparation method comprises the following steps: S1, stir-frying cleaned sesame seeds, squeezing, and carrying out oil-residue separation to obtain crude oil; and S2, carrying out adsorption treatment by adding an adsorbent into the crude oil, carrying out fine filtration, and collecting a filtered oil liquid so as to obtain high-quality sesame oil. Raw materials of the adsorbent comprise wood chip, montmorillonite and a dodecyl dimethyl betaine solution. The preparation methodhas an excellent effect of removing benzopyrene and color, and quality of sesame oil is improved.

The invention relates to an ecological and environment-friendly soil remedying agent. The soil remedying agent is formed by mixing 55-65 parts of modified hectorite, 20-30 parts of an organic fertilizer, 10-20 parts of humic acid and 1-3 parts of a microbial agent by weight, wherein the modified hectorite is prepared by a method comprising the following steps: calcinating hectorite, then adding amixed modifier, reacting while stirring, performing microwave irradiation treatment while stirring, and finally grinding into granules or powder. The soil remedying agent is applicable to remediationof heavy metal-contaminated soil, and has the advantages of low cost, ecological protection, a short remedying cycle, a good remedying effect, high remedying efficiency and the like.

The invention relates to a method for preparing nitrogen-doped graphene ink with the assistance of sodium deoxycholate. The method comprises the steps of: oxidizing natural flake graphite into graphene oxide which is high in oxygen content and most environmentally friendly in C6 element; carrying out hydrothermal nitrogen doping on the graphene oxide; and dispersing nitrogen-doped graphene in water, adding a surfactant in batches, carrying out ultrasonic treatment, alternately carrying out low-power and high-power ultrasonic treatment, dispersing, and spreading solute lamellas to finally obtain the nitrogen-doped graphene ink with a large lamellar stable dispersion, the lamellar size being 800-2000 nm and the thickness being 1-2 nm. The nitrogen-doped graphene ink can be used for a uniform micro-droplet jetting printing platform, and particularly can be used for printing a graphene metamaterial wave-absorbing microstructure through uniform micro-droplet jetting. The preparation method of the nitrogen-doped graphene ink has the advantages of stable dispersion, micron-scale lamella spreading and the like.

The invention relates to a production process of a high-strength aluminum alloy applied to a bicycle frame, and belongs to the technical field of alloy material preparation, and the production process comprises the following steps: transferring electrolytic aluminum liquid into a smelting furnace, adding Mg, Si, Cu and Mn, and heating for melting; adding a ceramic composite material; adding an aluminum alloy refining agent; discharging and pouring to obtain a cast rod blank, and carrying out hot extrusion forming and heat treatment on the cast rod blank to obtain an aluminum alloy pipe; and the surface of the aluminum alloy pipe is dip-coated with a super-hydrophobic coating. According to the technical scheme, the TiB2 and CeB6 nano-particles are introduced into the aluminum alloy melt, the TiB2 and CeB6 nano-particles have the potential of serving as nuclei, the nucleation rate during crystallization and solidification is increased, and the effect of refining aluminum alloy grains is achieved, so that the hardness of the generated aluminum alloy is increased, the elongation and the fatigue resistance are greatly improved, and the service life of the aluminum alloy is prolonged. The bicycle frame can pass the safety standard of European Union for the bicycle frame.

The invention relates to an antibacterial melt-blown polypropylene material and a preparation method thereof. The antibacterial melt-blown polypropylene material is prepared from the following raw materials in parts by weight: 100 parts of polypropylene powder; 0.2 to 1.2 parts of an antioxidant; 0.2 to 1.2 parts of a lubricant; 0.2 to 0.7 part of peroxide; 0.4 to 1.8 parts of alkyl glycoside; the melt index of the polypropylene powder is 10 to 40 g/10 min. The antibacterial melt-blown polypropylene material has good short-acting and long-acting antibacterial properties and excellent processability, and can be applied to the fields of air and liquid filtering materials, isolation materials, mask materials, thermal insulation materials and the like.

The present invention performs ground peony breed improvement through high branch grafting process using the plant of white Fengdan peony or other common peony as stock and other peony branch with flower bud as scion, and it uses the improved peony as direct improved plant. The said technology can shorten the culture period of improved peony breed from conventional 5-7 years to about 70 days, raise survival rate of grafted peony plant and reduce cost of grafted peony, and the said technology makes it possible to culture peony plant with several flower colors.

The invention discloses antibacterial and antistatic PTT fiber wool-like double-faced woolen cloth and a processing and finishing method thereof.The processing and finishing method comprises the following steps that S1, pretreatment is conducted, specifically, ester bonds on the fiber surface of the wool-like double-faced woolen cloth are hydrolyzed to generate carboxyl, and standby wool-like double-faced woolen cloth is obtained; s2, modification treatment: after washing the standby wool-like double-faced woolen cloth, grafting tyramine to obtain modified wool-like double-faced woolen cloth containing phenolic hydroxyl groups; and S3, finishing treatment: taking the modified wool-like double-faced woolen cloth, washing, carrying out free radical graft polymerization on the modified wool-like double-faced woolen cloth and a vinyl quaternary ammonium salt monomer under a catalytic system so as to graft polyethylene quaternary ammonium salt macromolecules on the surface of the polytrimethylene terephthalate fiber, washing, and drying, so that the modified wool-like double-faced woolen cloth is obtained. High temperature and strong alkali are not needed, the treatment temperature is low, production steps are simple, production energy consumption is low, damage to the fibers is reduced, grafting of vinyl quaternary ammonium salt molecules on the surfaces of the fibers is achieved, the antistatic and antibacterial performance of the fibers is effectively improved, diffuse reflection light of the fabric is increased, and the luster of the fabric is closer to that of wool products.