30results about How to "Solve the problem that it is difficult to disperse evenly" patented technology

The invention discloses a flexible strain sensor based on nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel. The preparation method of the flexible strain sensor comprises the followingsteps: (1) preparing a TEMPO nanocellulose suspension; (2) preparing a carbon nanotube dispersion; (3) preparing TEMPO nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel; and (4) attaching two separate copper electrodes to both sides of the hydrogel so as to obtain the flexible strain sensor based on the nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel. The sensor has high flexibility, stretchability, high mechanical properties, high electrical conductivity and strain sensitivity.

The invention provides a preparation method of a high-strength graphene / copper composite. Firstly, graphene oxide is adsorbed to surfaces of flake copper powder through an electrostatic self-assemblyprocess to prepare graphene oxide / copper compound powder. Then, copper plating is performed on the graphene oxide / copper compound powder through a chemical copper plating process to obtain copper-plated graphene oxide / copper compound powder. Then, heating reduction is performed on the copper-plated graphene oxide / copper compound powder through a tube furnace to obtain copper-plated graphene / coppercompound powder. Finally, the copper-plated graphene / copper compound powder is put into a discharge plasma sintering furnace to be sintered to prepare graphene / copper compound powder. By means of thegraphene / copper composite prepared through the method, uniform dispersing of graphene in a copper base body is realized, an interface bonding property of graphene and copper is improved, and mechanical properties of the composite are remarkably improved.

The invention discloses a method and a device for preparing tungsten powder reinforced aluminum matrix composite. The method comprises the following steps: mounting a quantitative tungsten powder supply device on a high-pressure inert gas input pipe of a device for atomizing, spraying and depositing aluminum or aluminum alloy liquid, taking high-pressure inert gas as a flow carrying medium, spraying the tungsten powder to the surfaces of aluminum or aluminum alloy micro-droplets formed by atomizing, enabling the tungsten powder to disperse and attach onto the surfaces of the aluminum or aluminum alloy micro-droplets, then spraying and depositing the tungsten powder and the aluminum or aluminum alloy micro-droplets to a substrate and solidifying to prepare the tungsten powder reinforced aluminum matrix composite. The device comprises a device for atomizing, spraying and depositing aluminum or aluminum alloy liquid, wherein a quantitative tungsten powder supply device is mounted on a high-pressure inert gas input pipe of the device for atomizing, spraying and depositing aluminum or aluminum alloy liquid. By virtue of the method, the high-pressure inert gas is taken as the flow carrying medium for spraying the tungsten powder and attaching the tungsten powder onto the surfaces of the aluminum or aluminum alloy micro-droplets, then the tungsten powder and the aluminum or aluminum alloy micro-droplets are solidified to prepare the tungsten powder reinforced aluminum matrix composite; the agglomeration of the tungsten powder can be effectively prevented; the tungsten powder reinforced aluminum matrix composite with uniformly distributed tungsten powder is prepared.

The invention relates to a lake asphalt / SBS compound modifier and a preparation method and application thereof. The lake asphalt / SBS compound modifier is a pre-dispersant which is prepared by the fusion and blending of lake asphalt, polymer SBS and compatilizers, and modified asphalt can be prepared by fusing and blending the lake asphalt / SBS compound modifier with petroleum asphalt and stabilizers. The obtained lake asphalt / SBS compound modifier is the pre-dispersant which can remarkably improve the high-temperature deformation resistance capability, low-temperature cracking resistance capability and water damage resistance capability of the petroleum asphalt, and by adding the pre-dispersant into the petroleum asphalt and taking use of the advantage of good compatibility between the pre-dispersant and the petroleum asphalt, the lake asphalt / SBS compound modified asphalt is prepared, wherein the modified asphalt is uniform in dispersion, and layered segregation does not occur easily on the modified asphalt. The modified asphalt is used for the construction of heavy-loaded traffic asphalt pavements in high temperature, damp and rainy areas, asphalt pavement diseases can be significantly reduced, the maintenance cost of the pavements is reduced, and the service life of the asphalt pavements is prolonged.

The invention discloses modified epoxy asphalt and a preparation method thereof, and a water-based drilling fluid and a preparation method thereof. The modified epoxy asphalt comprises the following components in parts by weight: 100 parts of matrix asphalt, 1-20 parts of a compatibilizer, 1-10 parts of a toughening agent, 5-20 parts of a curing agent, 1-5 parts of a curing accelerator and 5-30 parts of an epoxy resin, wherein the curing accelerator comprises a product obtained by reacting polyamine, phenol and an aldehyde-containing aqueous solution. According to the water-based drilling fluid, the modified epoxy asphalt liquid is added and is small in particle size and high in softening point, has a certain elastic deformation capacity and is excellent in high-temperature resistance, sothat the drilling fluid has good rheological property and high-temperature and high-pressure filtrate loss reduction effect when used at a high temperature.

The invention provides a spray-drying and hot-press vulcanization combination-based method for preparing a graphene / rubber composite material, and belongs to the technical field of graphene / rubber composite materials, aiming at solving the problems that an existing graphene / rubber composite material cannot use raw graphene without environment stress as filler and cannot be uniformly dispersed into nonpolar rubber by a simple process flow. The method comprises the following steps: 1, preparing a graphene dispersion liquid; 2, preparing graphene-rubber emulsion; 3, preparing graphene / rubber composite material powder by a spray-drying method; and 4, performing hot-press vulcanization with a flat plate to prepare the graphene / rubber composite material. The method can be widely applied to industrial production since pollution-free raw graphene is utilized as the raw material and can be uniformly dispersed into a non-polar rubber substrate.

The present invention provides a method for preparing C5 petroleum resin by catalyzed polymerization of chloroaluminate ionic liquid. The method is to add the C5 fraction into a dry airtight or inert gas-protected reactor, raise the temperature to 90-120°C, and add the C5 fraction under stirring. Chloroaluminate ionic liquid with a mass of 0.8-3.0% is polymerized at 120-150°C for 6-10 hours to obtain a viscous liquid; cool the viscous liquid at room temperature to solidify the viscous liquid into a brittle solid and crush it into an ultra-fine powder below 400 meshes, then soaked in 0.5% NaOH solution for 20-24 hours, then washed with distilled water until neutral, filtered to remove most of the water, and vacuum-dried at 80°C and 150°C for 3 hours respectively to obtain Light colored C5 petroleum resin. The invention overcomes the phenomenon that the use of solid AlCl3 as a catalyst easily causes sudden polymerization and kettle overflow, the reaction process is mild, the reaction is easy to control, and the obtained C5 petroleum resin product has stable performance and light color.

The invention belongs to the technical field of oil-bearing materials and discloses a graphene-reinforced copper based oil-bearing material and a preparation method and application thereof. The oil-bearing material is of graphene-coated copper powder obtained by adding copper powder in a water solution of oxidized-graphene colloids by filtering and drying after room temperature stirring reaction;subjecting the graphene-coated copper powder to cold pressing to form a blank body and placing the blank body for sintering in a protective atmosphere to obtain a porous graphene / copper composite material after natural cooling; placing the porous graphene / copper composite material into oil-bearing specialized lubricating oil for soaking till complete infiltration under a certain negative pressureprior to cooling the oil-bearing specialized lubricating oil naturally. The graphene-reinforced copper based oil-bearing material has the advantages of less abrasion, good bearing force, high oil content and stabile lubricating property, the problem that a graphene nano-sheet is difficult to be uniformly dispersed in a copper matrix is effectively solved, and the graphene-reinforced copper based oil-bearing material is applicable to the fields of audio machinery, home appliance machinery, office machinery and transport machinery bearings.

The invention belongs to the technical field of preparing metal matrix composite reinforcements and particularly relates to a method for preparing chemical iron-plated graphene through a one-step activation method. By means of the method for preparing the chemical iron-plated graphene through the one-step activation method, the oxidized graphene is put in activating liquid, homogenizing operationis conducted, filtering is conducted, filter liquid is reserved, washing is conducted, the graphene is washed to be neutral, and activated oxidized graphene is obtained; the activating liquid is a precious metal salt complex solution; and the activated oxidized graphene is subjected to ultrasonic dispersion, then a chemical iron plating solution is added, mixing is conduced, a reaction is carriedout, and the chemical iron-plated graphene is obtained. By means of the method, wettability between the graphene and a metal matrix is improved, and the problem that the graphene is hardly dispersed evenly in the metal matrix is solved. Meanwhile, a one-step activation technology is adopted, the technical process is simplified, and the production cost is greatly reduced.

The invention relates to the technical field of lithium ion batteries and supercapacitors, particularly to a zirconium doped porous carbon material and a preparation method for preparing a lithium ioncapacitor battery composite positive electrode, wherein the surface of a porous carbon material is uniformly coated with a layer of nanometer Zr(OH)4 particles through a co-precipitation method, andthen heating and thermal insulation is performed in a protective atmosphere to prepare the zirconium doped porous carbon material. The preparation method for preparing a lithium ion capacitor batterycomposite positive electrode by using the zirconium doped porous carbon material comprises: (1) uniformly mixing a lithium battery positive electrode material, an electric conduction agent and the zirconium doped porous carbon material to obtain a mixed active substance; and (2) coating a current collector with the mixed active substance to obtain the composite positive electrode. According to thepresent invention, with the application of the zirconium doped porous carbon material in the preparation of the lithium ion capacitor battery composite positive electrode, the electrochemical performance and the safety performance of the capacitor battery can be improved.

The invention discloses a method for preparing a continuous carbon fiber reinforced aluminum matrix composite. The method for preparing the continuous carbon fiber reinforced aluminum matrix compositecomprises the steps that after pretreatment and plating application are conducted on bare carbon fiber in sequence, work blanks are then prepared; an appropriate number of work blanks are taken and placed in extrusion dies; a compressor is adopted, the work blanks are formed through extrusion, and prefabricated blocks are acquired; the prefabricated blocks are placed in a plasma sintering furnace, and the continuous carbon fiber reinforced aluminum matrix composite is acquired after sintering. The preparation technology of the continuous carbon fiber reinforced aluminum matrix composite is simple; besides, carbon fiber is uniformly dispersed in the matrix, and material properties are isotropic; and in addition, various kinds of physical properties of the composite are improved, and meanwhile, the mechanical property of the composite is improved conspicuously.

The invention discloses graphene / boron carbide composite powder for hot pressed sintering, a preparation method thereof and a preparation method of a ceramic product, and belongs to the field of ceramic materials. Boron carbide powder, graphene oxide and syrup are used as raw materials; atomization granulation and precursor carbonization processes are carried out to obtain the spherical graphene oxide / boron carbide composite powder with uniform component composition; and hot pressed sintering is performed to obtain the graphene / boron carbide composite ceramic with good component structure uniformity. According to the preparation method of the graphene / boron carbide composite powder, all the components of the composite powder are mixed in proportion and subjected to wet grinding to obtain stably-dispersed slurry, spherical composite powder with uniform components is obtained through an atomization granulation process, the obtained atomization granulation powder is subjected to carbonization and hot pressed sintering in a vacuum environment, and a graphene / boron carbide composite ceramic product with uniformly-dispersed graphene is obtained. The problems of large component segregation, difficult process amplification and the like of the graphene / boron carbide composite powder are solved, and the preparation method is suitable for preparing the graphene / boron carbide composite ceramic material with an excellent performance through hot pressed sintering.

The invention provides a cement-based conductive composite material, and relates to the technical field of cement materials. The cement-based conductive composite material comprises the following components by weight: 80-100 parts of cement; 110-140 parts of fly ash; 80-100 parts of silica fume; 70-120 parts of water; 1-5 parts of a water reducing agent; 10 to 15 parts of rubber powder; 1-5 partsof steel fibers; 1-3 parts of carbon fiber; 1-3 parts of polyvinyl alcohol fiber; and 30-50 parts of ferrite. The invention also provides a preparation method of the cement-based conductive compositematerial, which comprises the following steps of: uniformly mixing the cement, the fly ash, the silica fume and the rubber powder; adding the water, the steel fibers, the carbon fibers, the polyvinylalcohol fibers, the ferrite and the water reducing agent, and stirring for 5-10 minutes; pouring the mixture into a mold, and vibrating for 1-3 minutes; pressurizing to remove bubbles, strickling thesurface, and maintaining for 24-36 hours; and carrying out demolding maintenance for 28-30 days. The material disclosed by the invention has a relatively strong electromagnetic wave absorption function in a wide frequency range, and has relatively good compressive strength.

Firstly, adopting conventional foaming process to make polymer particles be foamed to obtain porous polymer granules material with through hole, then dispersing said porous polymer granules into water phase, adding raw material capable of forming inorganic nano particles in the water phase, stirring at high speed and making the inorganic nano particles be adsorbed in the lots of micropores of the polymer and on the surface of them to obtain the organic / inorganic nano composite mother granules, after the composite mother granules and conventional polymer are uniformly mixed, using conventional forming processing technology to prepare the invented nano composide material.

The invention discloses a preparation method of a positive electrode composite material, the positive electrode composite material and a secondary battery. The preparation method of the positive electrode composite material comprises the following steps of: adding conductive carbon material powder into a soluble positive electrode active material solution, and fully mixing to obtain a first mixed solution; adding an organic solvent which is mutually soluble with water into the first mixed solution to obtain a second mixed solution; and filtering the second mixed solution, and collecting filter residues which are the needed positive electrode composite material. According to the preparation method of the positive electrode composite material, the soluble positive electrode active material is adsorbed by the conductive carbon material powder, and then the soluble positive electrode active material permeating into micropores of the conductive carbon material powder is separated out through the organic solvent which is mutually soluble with water, and therefore, the soluble positive electrode active material forms small particles which are uniformly attached to the conductive carbon material powder, and the positive electrode composite material is obtained.

The invention discloses a flexible strain sensor based on nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel. The preparation method comprises the following steps: a. preparing TEMPO nanocellulose suspension; b. preparing carbon nanotube dispersion c. Prepare TEMPO nanocellulose-carbon nanotubes / polyacrylamide conductive hydrogel; d. Connect two separate copper electrodes to both sides of the hydrogel, that is, nanocellulose-carbon nanotube-based / Flexible strain sensor of polyacrylamide conductive hydrogel. The sensor provided by the present invention combines high flexibility, stretchability, high mechanical properties, high electrical conductivity and strain sensitivity.

The invention discloses a nanocomposite hydrogel dressing and its preparation method and application. In the method, polyether F127 polymer aqueous solution is used as a reaction medium, and sodium phytate and copper chloride are added in a certain proportion; in an ice-water bath environment, Through the coordination assembly strategy of phosphate and copper ions, copper phytate gradually nucleates and grows, and is uniformly dispersed in the F127 aqueous solution; finally, the pH of the reaction system is adjusted to neutral, and the reaction solution is gradually transformed into a coagulated form by heating in a water bath. gel state, that is, the nanocomposite hydrogel is prepared. The preparation method of the nanocomposite hydrogel dressing proposed in the present invention is green and environment-friendly, the raw materials are safe, and the cost is low. The hydrogel dressing prepared by the method has excellent mechanical properties and biological activity. The excellent temperature sensitivity, injectability and self-healing properties of the nanocomposite hydrogel ensure that it can be applied in complex wound environments.

The invention discloses a method for preparing a rubber composite material based on blending of pure carbon graphene and eucommia ulmoides natural rubber, and relates to the technical field of rubbercomposite materials. The preparation method comprises: mixing and dispersing graphene and eucommia ulmoides natural rubber, adding a dispersing agent, a silane coupling agent, an accelerant and a vulcanizing agent, so that the pure carbon graphene and eucommia ulmoides natural rubber blended rubber is prepared, preparing a pure carbon graphene and eucommia ulmoides natural rubber blended rubber composite material through rubber mixing and vulcanization, and uniformly dispersing graphene in the rubber material in the preparation process. The comprehensive properties such as the mechanical property, the electrical property and the thermal conductivity of the rubber composite material are facilitated, the method is simple in process, low in cost, high in production efficiency and good in controllability, the composite material with high filling amount can be prepared, the requirements of different projects can be met, and the problems that in the past, the filling amount is too large, andgraphene is difficult to disperse uniformly are solved.

The invention discloses a polyester composition as well as a preparation method and application thereof. The polyester composition comprises 4 to 50 ppm of a titanium element, 0.1 to 100 ppm of a phosphorus element and 1.5 to 30% of a nano white filler. The phosphorus element is derived from an alkali metal salt of polyphosphoric acid contained in the polyester composition, and the nano-white filler is selected from a nano-white pigment having a refractive index being greater than 1.50 at 20 DEG C. The preparation method comprises the step of carrying out esterification and condensation polymerization on components including dicarboxylic acid, alkylene glycol, a titanium source, a phosphorus source and a white filler to obtain the polyester composition. The polyester composition can be used for producing film materials such as photovoltaic backboards. The polyester composition is low in terminal carboxyl group content, meets the technical requirement of hydrolysis resistance, and achieves better ultraviolet resistance.

The invention discloses a modified epoxy asphalt, a water-based drilling fluid and a preparation method thereof. The modified epoxy asphalt, in parts by weight, includes: 100 parts of base asphalt, 1-20 parts of compatibilizer, 1-10 parts of toughening agent, 5-20 parts of curing agent, 1-5 parts of curing accelerator parts, 5 to 30 parts of epoxy resin; wherein, the curing accelerator includes polyamines, phenols and products obtained by reacting aldehyde-containing aqueous solutions. The modified epoxy asphalt fluid is added to the water-based drilling fluid of the present invention. The modified epoxy asphalt not only has a small particle size, a high softening point, and a certain elastic deformation ability, but also has excellent high temperature resistance. The drilling fluid When used at high temperature, it has good rheological properties and high temperature and high pressure drop fluid loss effect.

The invention relates to the technical field of metal matrix composite reinforcements, and in particular to a surface metallized graphene and a preparation method thereof. Mix the graphene oxide dispersion and activator in the electroplating solution, use titanium as the cathode and copper as the anode plate to connect to direct current for electroplating, so that graphene oxide is deposited on the surface of the surface that has been plated with a layer of copper film during the electroplating process. On the titanium plate, a composite coating containing copper and graphene oxide is formed on the titanium plate. The composite coating is collected to obtain surface metallized graphene. The surface metalized graphene includes a metal film wrapped on the surface of graphene oxide. The metal film is metal Copper film. The invention does not need to introduce a connecting medium, greatly shortens the process flow and reduces production costs. At the same time, the preparation raw materials can be recycled, no waste liquid is generated, and is environmentally friendly. It also improves the wettability between graphene and the metal matrix and solves the problem of graphite. The problem of uniform dispersion of alkenes in metal matrix.