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 relates to the technical field of preparation of active amino-terminated functional compounds, in particular to a method for preparing amino-terminated polyurethane by using a steric hindrance protection method. The method concretely comprises the following steps: respectively selecting isophorone diisocyanate and isophorone diisocyanate which have similar functional groups and different reactive activities as blocking modification raw materials; realizing a reaction rate gradient through steric hindrance protection; and directly functioning amino at two ends of a main structure to prepare the amino-terminated polyurethane. The amino-terminated polyurethane is directly and efficiently prepared through the steric hindrance protection method, thus, the defect that isocyanic acid rapidly reacts with the amino is avoided, the reaction process has a certain speed gradient, the generation of a crosslinking structure is inhibited, the production risk and the production energy consumption are remarkably reduced, and the product performance and the production efficiency are increased.

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 discloses a nanometer zero-valent iron-loaded lignin-grafted bentonite composite material and a preparation method thereof, belonging to the technical field of functional materials. The composite material is characterized in that bentonite is grafted with lignin and is then loaded with nanometer zero-valent iron. Compared with the prior art, the composite material provided by the invention has the following advantages: nanometer zero-valent iron in the composite material has obviously improved dispersibility and stability, good wastewater treatment capability, and good promotion and application value.

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.

Provided is a fruit grafting method. A plant fruit or a root tuber or a tuber is selected and serves as a maternal fruit, and the maternal fruit is connected with a maternal plant. One or more fruits or root tubers or tubers identical to or different from the maternal fruit are selected and serve as grafting fruits, a plant of the maternal fruit and the plants of the grafting fruits belong to the same category or the same family, and the grafting fruits are connected or break away from the maternal plant. The grafting fruits are grafted to the maternal fruit by means of an approach grafting method or a cut-in method. When the approach grafting method is adopted, the maternal fruit and the grafting fruits are flatly cut, fruit peels with the same areas are removed, and then cut openings of the maternal fruit and the grafting fruits are rapidly and tightly bonded to ensure vascular bundle phloems at the position of the cut openings to be aligned and are fixed through rubber bands or adhesive tapes. The fruit grafting is achieved by means of the fruit grafting method, and accordingly melons and fruits with ornamental value can be created by utilizing the grafting of different fruits.

The invention discloses automatic grafting equipment for greenhouse seedling-raising jujube trees, which comprises a conveying belt, a stock cutting and splitting mechanism and a film wrapping mechanism are sequentially arranged at the top of the conveying belt in the conveying direction of the conveying belt, and a scion cutting mechanism is arranged at the top of the stock cutting and splitting mechanism; the stock cutting and splitting mechanism cuts off the jujube tree seedlings into stocks, and the stock cutting and splitting mechanism splits the stocks inwards from the two sides and opens the stocks. By arranging the stock cutting and splitting mechanism, the jujube seedlings can be automatically cut off to form the stocks and synchronously split the stocks, and when two groups of cutters and splitting knives are close to each other, the jujube seedlings can be cut off and split at a time, so that the working efficiency is improved; and due to the fact that the method that the two splitting knives are close to each other is adopted for splitting the stocks, during splitting, the two splitting knives make contact with the bark parts of the stocks firstly, the bark parts are cut open firstly, smoothness of the split parts of the bark is guaranteed, and therefore the jointing effect of the joints of the stocks and the scions is improved.

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 provides a preparation method of epoxy resin for copper coating of an aluminum plate. The preparation method comprises the following steps: S1, adding a proper amount of deionized waterinto melamine, stirring until melamine is completely dissolved in deionized water, adding phytic acid, and stirring at 90 DEG C for 1-3 hours to obtain finishing liquid, wherein the mass ratio of melamine to phytic acid is 1: (0.5-1.5); S2, weighing bisphenol A epoxy resin, dissolving bisphenol A in anhydrous ethanol, after bisphenol A epoxy resin is completely dissolved, heating the solution to 60-90 DEG C, dropwise adding the finishing liquid into the mixed solution of bisphenol A epoxy resin and anhydrous ethanol, and carrying out a reaction under stirring at a constant temperature for 2-4hours to obtain modified epoxy resin, wherein the mass ratio of the finishing liquid to bisphenol A epoxy resin is (30-90): 100, and the softening point of bisphenol A epoxy resin is lower than 35 DEGC. N and P flame-retardant elements are introduced into bisphenol A epoxy resin; grafting of a flame retardant on epoxy resin is realized, the problem of dispersion of a flame retardant in epoxy resin is solved, the bonding performance of the modified epoxy resin is guaranteed, and meanwhile the thermal stability and the flame retardant performance of the modified epoxy resin are improved throughthe synergistic effect of N / P flame retardant elements and a stable net-shaped structure.

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 provides a method for grafting carbonate on the surface of graphene oxide. The method comprises the following steps of (1) preparing a graphene oxide solution from graphite by adopting a modified Hummers method, and centrifugally washing off impurities by using dilute hydrochloric acid and deionized water repeatedly; (2) adding ethanediamine to a graphene solution while vigorously stirring, reacting an oxygen-containing functional group of the graphene oxide with one amine radical of the ethanediamine under a high-temperature oil bath condition, and marking a product as a product A; (3) dropwise adding concentrated hydrochloric acid to the product A by adopting a burette under an ice bath condition, reacting the concentrated hydrochloric acid with another amine radical of the ethanediamine, and marking a product as a product B; (4) dropwise adding excessive saturated sodium carbonate solution to the product B under a water bath condition, vigorously stirring, grafting carbonate instead of chloridion on the amine radical, and marking a product as a product C; and (5) filtering and drying the product C to obtain the graphene oxide grafted with the carbonate on the surface. The method is simple, the impurities are easy to separate in the preparation process, the product is high in conversion rate, the method is suitable for large-scale preparation and production, and meanwhile, reference is provided for modification of the functional group on the surface of the graphene oxide.

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.

A three-dimensional mixed conductive adhesive for lithium batteries and a battery containing the adhesive. The binder includes: carbon nanotubes, graphene, and polymers with chemical bonds between carbon nanotubes and graphene. The carbon nanotubes and graphene in the binder are mixed in a certain ratio to form a three-dimensional conductive network, and the polymer groups and the groups on the graphene carbon nanotubes can be effectively combined to improve the strength of the composite, and in the preparation of the electrode slurry can be well dispersed. During the charge and discharge process, the three-dimensional composite conductive binder can better restrain the expansion and contraction of the active material of the electrode sheet, and effectively improve the cycle stability and rate performance of high capacity and high volume change electrode materials, such as, Silicon-based negative electrode materials, tin-based negative electrodes, and high volume change electrode materials that can be expanded to new battery systems in the future.

The invention discloses biocompatible polyurethane modified by sulfonated hydroxypropyl chitosan and a method for preparing the biocompatible polyurethane. The method includes synthesizing the sulfonated hydroxypropyl chitosan from chitosan by means of etherification reaction and sulfonation treatment, then adding diphenyl-methane-diisocyanate, polyethylene glycol and catalysts into a reactor and carrying out stirring reaction under the protection of nitrogen at the temperatures of 70-80 DEG C for 2-4 h; adding the sulfonated hydroxypropyl chitosan into reaction products and carrying out cooling reaction for 6-12 h to obtain the biocompatible polyurethane modified by the sulfonated hydroxypropyl chitosan. The biocompatible polyurethane and the method have the outstanding advantages that the sulfonated hydroxypropyl chitosan which is a water-soluble heparinoid substance is covalently grafted on polyurethane long chains, and accordingly the hydrophilicity and the anticoagulation properties of polyurethane can be greatly improved; processes are simple, reaction conditions are mild and are easy to control, and raw materials are easily available and are low in cost.

The invention discloses an Internet of Things system for office file management. The Internet of Things system comprises a central server, and a unit coding module, a unit scanning module, a data analysis module, a data storage module, a classification statistics module and a retrieval analysis module which are connected with the central server. Through the system design of the unit coding module,the unit scanning module, the data analysis module, the data storage module, the classification statistics module and the retrieval analysis module, a company can conveniently manage the copywriting,omission is avoided, technical grafting is achieved, retrieval is facilitated, meanwhile, the safety of the copywriting is improved. And systematic safety management of company archives is facilitated.

The invention relates to catalyst carrier PIL-rGO (poly ionic liquid-reduced graphene oxide) with rewritable performance, a preparation method of the catalyst carrier and an application. The preparation method includes the steps: dissolving an appropriate amount of taken 1-vinyl-3-ethyl imidazole bromide by the aid of chloroform, adding azobisisobutyronitrile, performing refluxing reaction under the protection of nitrogen, and performing cooling, washing and drying to obtain modified poly ionic liquid (PIL-Br) with Br (Bromum) negative ions; ultrasonically dispersing GO (graphene oxide) into water, adjusting a pH (potential of hydrogen) value to be 12, stirring mixture, dropping PIL-Br and hydrazine hydrate, and performing refluxing reaction, filtering, water washing and freeze-drying to obtain PIL-rGO with Br negative ions. According to the method, a novel functional material PIL-rGO with the rewritable performance is firstly designed and synthesized, replacement of different catalytic activity centers on the same catalyst carrier and self-renewing of carriers are achieved by the aid of reversible exchange between the PIL and acid negative ions on the PIL-rGO carriers, the catalytic activity centers are uniformly distributed on the surfaces of the carriers by the aid of a designed catalyst, and the catalytic efficiency of fuel oil desulfurization is effectively improved.