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

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 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 discloses a preparation method and application method of TEMPO nanocellulose-polyacrylic acid gel. The preparation method comprises the following steps: a. preparing TEMPO nanocellulose suspension; b. preparing carbon nanomaterial dispersion; c. TEMPO The nanocellulose suspension is mixed with the carbon nanomaterial dispersion, added to the polyacrylic acid aqueous solution, added with a crosslinking agent, and stirred until a gel is formed to obtain a carbon nanotube-TEMPO nanocellulose-polyacrylic acid gel. The present invention introduces the concept of biology into polymer materials to form an intelligent material with self-healing properties, prolongs the service life of the material, and restores and retains its original characteristics. And in some applications, it can avoid damage caused by the accumulation of cracks and improve the safety of materials.

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 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 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 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 belongs to the technical field of oil-impregnated bearing materials, and discloses a graphene-reinforced copper-based oil-impregnated bearing material, a preparation method and an application thereof. The oil-containing bearing material is obtained by adding copper powder into graphene oxide colloidal aqueous solution, stirring and reacting at room temperature, filtering and drying to obtain graphene-coated copper powder; cold-pressing the graphene-coated copper powder to obtain an embryo body, The green body is sintered in a protective atmosphere, and after natural cooling, a porous graphene / copper composite material is obtained; the porous graphene / copper-based composite material is placed in a special lubricating oil for oil-impregnated bearings, and soaked under a certain negative pressure until completely Soaked and naturally cooled. The graphene-reinforced copper-based oil-bearing bearing material prepared by the invention has the advantages of less wear, good bearing capacity, high oil content and stable lubrication performance, and effectively solves the problem that graphene nanosheets are difficult to uniformly disperse in the copper matrix. It is used in the fields of audio machinery, household electrical appliances, office machinery and transportation machinery bearings.

The invention provides a toughened nylon 66 material and a preparation method and application thereof. The nylon material is prepared from 100 parts of nylon 66, 4-20 parts of crude silicon rubber, 0.3-0.8 part of an antioxidant and 0.024-0.3 part of a sulfurizing reagent. The preparation method comprises the steps that the nylon 66, the crude silicon rubber, the antioxidant and the sulfurizing reagent are weighed according to the parts by weight, after being mixed to be uniform, the components are added into a double-screw extruder for melting and blending, and cooling, traction and chopping are performed to obtain the toughened nylon 66 material. The raw silicon rubber is used as a toughening agent, the dynamic vulcanization technology is adopted for toughening the nylon 66, the silicon rubber can be evenly dispersed into a nylon 66 base body in a micron order small particle shape, and therefore the toughened nylon 66 material with the high toughness and good heat resistance is obtained.

The invention discloses a modified epoxy asphalt, a water-based drilling fluid and a preparation method thereof. The components of the modified epoxy asphalt include modified asphalt, epoxy resin and curing agent, wherein the components of the modified asphalt include base asphalt, organic acid anhydride, SBS and crosslinking agent. The water-based drilling fluid includes base slurry and modified epoxy asphalt fluid, and the modified epoxy asphalt fluid includes modified epoxy asphalt and water. The modified epoxy asphalt of the invention not only has small particle size, high softening point, certain elastic deformation ability, but also excellent high temperature resistance. The drilling fluid has good rheological properties and high temperature and high pressure fluid loss reduction effect when used at high temperature.

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 relates to a method for using chlorine aluminic acid ion liquid to prepare C5 petroleum resin by catalyzing and polymerizing. C5 fraction is added into a dry and closed container or a container which has inactive gas protection , the temperature of 90 to 120 DEG C can be improved, and then the chlorine aluminic acid ion liquid with 0.8 to 3.0 percent of the C5 fraction quality is added under the mixing condition to polymerizing and reacting for 6 to 10 hours to get slumpability liquid; the gotten slumpability liquid is cooled at room temperature to be coagulated into brittle solid, and then crushed to superfines below 400 meshes, and soaked and processed by 0.5 percent of NaOH solution for 20 to 24 hours, and then washed by distilled water until neutrality, dried for 3 hours respectively in the vacuum of 80 DEG C and 150 DEG C after filtrating and eliminating most of water, and finally light colored C5 petroleum resin can be obtained. The invention overcomes flash polymerization and overflowing kettle phenomenon caused by using solid AlCl3 as a catalyst. The reaction process is gentle, and the reaction is easy to be controlled. The obtained petroleum resin product has stable performance and light color.

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-based composite material reinforcement bodies, in particular to a surface-metallized graphene and a preparation method thereof. The preparation method for the surface-metallized graphene comprises the steps that an oxidized graphene dispersing liquid and an activating agent are mixed in an electroplating liquid, electroplating is conducted by connecting titanium as cathode plate and copper as anode plate to direct current so that oxidized graphene is deposited on a titanium plate with surface plated and covered with a layer of copper film in the electroplating process, and a composite plated layer containing copper and oxidized graphene is formed on the titanium plate; and the composite plated layer is collected, and surface-metallizedgraphene is acquired. The surface-metallized graphene comprises a metal film wrapping the surface of the oxidized graphene, and the metal film is a metal copper film. According to the preparation method for the surface-metallized graphene, connecting media do not need to be brought in; the technological process is shortened substantially; the production cost is lowered; meanwhile, raw materials for preparation can be utilized cyclically, no waste liquid is generated, and the method is environment-friendly; besides, wettability between the graphene and metallic matrix is improved; and the problem that graphene is difficult to disperse uniformly in the metallic matrix is solved.