781results about How to "Uniform and stable dispersion" patented technology

Nanomaterials have been used as a supplement or replacement of traditional polymer-based viscosity modifiers for lubricants and other related fluids. Compared with traditional polymer-based viscosity modifiers, nanomaterials possess better viscosity-index modification functions, i.e., more even viscosity increase across the whole temperature range. Meanwhile, a cost-effective way of making nanomaterials have been developed based on commercially available graphite materials, and the resulting nanoparticles of graphite are nanodisks (nanoplates). Furthermore, it provides a viscosity modifier which exhibits temporary shear loss, which can contribute to fuel economy, but no permanent shear loss.

A lubricant composition having an enhanced thermal conductivity, up to 80% greater than its conventional analogues, and methods of preparation for these fluids are identified. One preferred composition contains a base oil, nanomaterial, and a dispersing agent or surfactant for the purpose of stabilizing the nanomaterial. One preferred nanomaterial is a high thermal conductivity graphite, exceeding 80 W/m in thermal conductivity. The graphite is ground, milled, or naturally prepared to obtain a mean particle size less than 500 nm in diameter, and preferably less than 100 nm, and most preferably less than 50 nm. The graphite is dispersed in the fluid by one or more of various methods, including ultrasonication, milling, and chemical dispersion. Carbon nanostructures such as nanotubes, nanofibrils, and nanoparticles are another type of graphitic structure useful in the present invention. Other high thermal conductivity carbon materials are also acceptable. To confer long-term stability, the use of one or more chemical dispersants or surfactants is useful. The thermal conductivity enhancement, compared to the fluid without graphite, is proportional to the amount of nanomaterials added. The graphite nanomaterials contribute to the overall fluid viscosity, partly or completely eliminating the need for viscosity index improvers and providing a very high viscosity index. Particle size and dispersing chemistry is controlled to get the desired combination of viscosity and thermal conductivity increase from the base oil while controlling the amount of temporary viscosity loss in shear fields. The resulting fluids have unique properties due to the high thermal conductivity and high viscosity index of the suspended particles, as well as their small size.

The invention discloses a method for preparing graphene functionalized alginate fibers. The method comprises the following steps: firstly adding a defined amount of graphene to a sodium alginate solution to obtain a graphene/alginate spinning solution; or aminating the defined amount of graphene and then ensuring the aminated graphene to covalently bind with sodium alginate through a chemical reaction to obtain a graphene-alginate spinning solution; then ensuring the graphene/alginate spinning solution or the graphene-alginate spinning solution to respectively undergo a coagulation bath to obtain graphene/alginate as-spun fibers or graphene-alginate as-spun fibers; and then drawing, setting and oiling the graphene/alginate as-spun fibers or graphene-alginate as-spun fibers after ensuring the graphene/alginate as-spun fibers or graphene-alginate as-spun fibers to undergo a preheating bath and a drawing bath respectively to obtain graphene/alginate functionalized fibers or graphene-alginate functionalized fibers which are called graphene functionalized alginate fibers. The prepared graphene functionalized alginate fibers integrate the excellent performances of the graphene and the sodium alginate and have the excellent performances such as high tensile strength, good biocompatibility, antistatic performance, light weight, high elasticity, antibacterial performance and the like.

The invention discloses a graphene conductive composite coating material. The graphene conductive composite coating material contains macromolecular film-forming resin, graphene and a graphene dispersant; and the graphene dispersant contains an aniline oligomer or a derivative thereof or soluble polyaniline which can be combined with the graphene through PI-PI interaction so as to enable the graphene to be uniformly and stably dispersed in the macromolecular film-forming resin or a mixture of the macromolecular film-forming resin and water and/or an organic solvent. The invention also discloses a preparation method for the coating material. According to the coating material disclosed by the invention, the graphene can be uniformly and stably dispersed in a coating material matrix, so that the application of the coating material in the aspects of conductive macromolecular coatings and the like can be greatly promoted; the preparation process is simple, does not need complex chemical reactions and is easy to control, and the coatings made from the coating material have good bonding capability on surfaces of macromolecular materials, metallic materials, textile materials and ceramic materials; and meanwhile, the coating material also has the characteristics of radiation resistance, electrostatic resistance, corrosion prevention, wave absorbing, wear resistance and the like, thereby being broad in application prospect.

The invention relates to the field of graphene, particularly a high-quality graphene dispersion method and a method for preparing a film from a corresponding graphene dispersion solution or slurry. Graphene powder or aggregation-state slurry is added into a micromolecule amine compound solution to carry out dispersion treatment, so that the three amine micromolecule compounds are utilized to implement dispersion of the graphene; and in the dispersion solution, the molecules of the compounds are combined with the graphene under the pai-pai interaction, the amino group protonation is utilized to electrically charge the graphene, and the electrostatic repulsion action is utilized to prevent aggregation, thereby implementing the stable dispersion of the graphene. The dispersion solution or slurry can be subjected to spray coating, roller coating, scratch coating or any other conventional coating preparation method to obtain a graphene film on the substrate surface. The method can implement high-concentration efficient dispersion on high-quality graphene with the carbon/oxygen atom ratio of greater than 20 in multiple solvents; and after the film is formed and dried, no solvent or dispersant residue exists.

The invention discloses lithium battery positive electrode slurry. The lithium battery positive electrode slurry is a mixture of a positive electrode material and an organic solvent. The positive electrode material is composed of, by mass, 60-97% of a positive electrode active material, 1-30% of a binding agent, 0-10% of a conductive agent, 1-5% of a conductive reinforcing agent and 0.1-3% of a dispersing agent. A lithium battery prepared by the lithium battery positive electrode slurry provided by the invention has the advantages of excellent high temperature performance, high capacity conservation rate, good cycle performance, long service life and the like. The invention also provides a preparation method of the lithium battery positive electrode slurry, enabling solid materials such as the conductive reinforcing agent to be distributed in the organic solvent uniformly and stably and to be directly stirred and mixed in a common stirring apparatus, so that the operation is convenient and the method can realize large-scale production.

The invention provides a process for preparing a novel nanometer/ micrometer inorganic- biological degradable polyester composite material comprising, subjecting hydroxyapatite nanometer/micrometer particles and lactic acid to dewatering polycondensation reaction in organic solvent under the condition of heating and stirring, further reacting under toluene azeotropic dewatering condition, the dewatering polycondensation reaction can also be conducted to hydroxyapatite and lactic acid without the presence of solvent, grafting the hydroxyl of the particle surface of the hydroxyapatite to obtain the chemical constitution of lactic acid ester or low polylactic acid ester - hydroxyapatite, under the condition of waterless and oxygen free, using stannous octoate as initiating agent to trigger epsi-caprolactone, lactide, glycolide or cyclic ester monomer, and ring-opening polymerizing to obtain the homopolymer of epsi-caprolactone, lactide or glycolide biodegradable polyester and the nanometer/micrometer composite material of their dyadic and ternary copolymer.

The invention discloses a nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor and a preparation method thereof. The nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor comprises the following components in percentage by weight: component 1, propargyl alcohol, formaldehyde, urotropine, potassium iodide, antimonous oxide, antimony butter, surfactant and solvent in the ratio of (1-50) : (0-25) : (1-25) : (0-10) :(0-10) : (0-20) : (6-25) : (15-70), wherein the component 1 is selected from one or more of chlorinated N-benzyl-R-pyridine quaternary ammonium salt or chlorinated N-benzyl-R-quinoline quaternary ammonium salt. The nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor has the advantages of small addition amount, low cost, stable and uniform dispersion in acidic liquid, low corrosion speed, capability of resisting high temperature of over 160 DEG C and excellent performance. 0.5-2.5 percent of nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor disclosed by the invention is added into the acidic liquid, so that the corrosion speed is far lower than national primary standard.

The invention discloses nano-silica/polyacrylate organic and inorganic hybrid water-dispersible resin and a preparation method thereof. According to the method, a silane coupling agent is adopted to modify a methyl methacrylate dispersion liquid of silica at first, and then in-situ polymerization of the modified methyl methacrylate dispersion liquid of silica and acrylate monomers is carried out in a solvent. The nano-silica/polyacrylate organic and inorganic hybrid water-dispersible resin comprises the following ingredients in parts by mass: 20-40 parts of a solvent, 10-40 parts of a modified methyl methacrylate dispersion liquid of silica, 8-14 parts of acrylate monomers, 2-6 parts of acrylic acid, 0.15-0.5 part of an initiator, 1.5-5.5 parts of a pH regulator and 10-30 parts of deionized water. The water-dispersible resin is a pale yellow or pale yellow and slightly-blue semitransparent liquid, is favorable in storage stability, high in coating transparency and good in stain resistance and water resistance, the hardness can be 4H or above and the adhesion can be 1 grade.

The invention provides a preparation method of a polyimide film. The preparation method comprises the following steps of mixing and grinding a heat-conducting padding, a solvent and a coupling agent to obtain slurry; enabling diamine and dianhydride to react in a solvent, so as to obtain polyimide resin; mixing, defoaming and casting the slurry and the polyimide resin to obtain a polyamic acid film; conducting imidization on the polyamic acid film to obtain the polyimide film, wherein the heat-conducting padding includes a first heat-conducting padding of which the particle size is 100-200nm, a second heat-conducting padding of which the particle size is 50-100nm and a third heat-conducting padding of which the particle size is 10-50nm. The heat-conducting padding adopted by the polyimide film is different in particle size, so that the maximal packing degree is formed between the heat-conducting padding; an effective heat-conducting channel is formed; the heat-conducting property of the polyimide film is improved; the heat-conducting padding can be evenly dispersed in the solvent in a grinding manner; the prepared polyimide film is even to disperse, high in stability, and good in mechanical property in the presence of the coupling agent.

The invention discloses a preparation method of electrical stimulation-near infrared dual response high strength hydrogel. The preparation method comprises the following steps: with taking a thermosensitive polymer monomer as a main raw material, adding a natural polymer to prepare thermosensitive deformable hydrogel with a semi-interpenetrating network structure; and then sequentially adsorbing an oxidizing agent and a pyrrole monomer by utilizing the swelling effect of the hydrogel so that the pyrrole monomer sufficiently permeates into a hydrogel network and is oxidized into polypyrrole by the oxidizing agent. Due to the introduction of polypyrrole, the prepared hydrogel has conductivity and near-infrared responsibility. When the hydrogel is in an energized state or is irradiated by near infrared light, temperature of the hydrogel rises, and the thermosensitive polymer network in the hydrogel structure contracts, so that volume and shape change, and light-electricity dual stimulation response is realized; meanwhile, stimulation response behaviour of the hydrogel has good sensitivity. The prepared hydrogel also has good mechanical properties and biocompatibility and can be applied to multiple fields of drug controlled release systems, memory element switches and the like.

The invention discloses a manufacturing method of an inorganic particle filled polyimide film, in particular to a manufacturing method of an inorganic particle filled polyimide film which adopts a small-sized grinding ball as a grinding medium and also adopts a grinding machine to uniformly and stably disperse inorganic particles into an organic solvent, thereby improving the transparency and mechanical properties of the film. The manufacturing method comprises the following steps: adding a grinding ball with the diameter no more than 6mm into the grinding bucket of a grinding machine with a moving medium, and adding and grinding part of organic solvent, inorganic particles and surfactant until the inorganic particles are uniformly dispersed in the organic solvent, thereby obtaining inorganic particle/organic solvent suspension; adding the inorganic particle/organic solvent suspension, the remaining organic solvent and diamine and dianhydride with identical molar numbers into a reactor, and preparing inorganic particle/polyamic acid solution suspensoid in a conventional method; and preparing the inorganic particle filled polyimide film with the inorganic particle/polyamic acid solution suspensoid according to the production process of the conventional flow casting method. The film has the advantages of good transparency and excellent mechanical properties.

The invention relates to a corona-resistant polyimide film containing high-concentration nano metal oxide, which comprises the following main components: benzenetetracarboxylic anhydride, 4, 4'-diamino diphenyl ether and nano-scale aluminum oxide, wherein the particle size of the nano-scale metal oxide is in the range from 30nm to 50nm. The film provided by the invention has the following outstanding advantages that a novel coupling agent is synthesized and is compounded with titanate coupling agent NDZ-130 to conduct surface modification on prepared alpha-Al2O3, thus the modified nano-particles can be steadily and uniformly dispersed in the substrate polyimide film with relatively high mass percentage (can reach 30wt%). By adoption of the above novel technical scheme of the invention, the technical problem that high-concentration nano-metal oxide is very difficultly doped uniformly in the corona resistant polyimide film according to the prior art is solved well, and meanwhile the mechanical strength of the film is kept from dropping.

The invention relates to a method for preparing a nanometer Fe3O4/SiO2 composite aerogel particle by a supercritical method. The method is characterized in that: firstly, by utilizing a sol-gel method, precursors-Fe(OH)2 and Fe(OH)3 of a Fe3O4 crystal are prepared, and the precursors are added in a precursor of SiO2 aerogel, subjected to ultrasound for a few minutes, stirred at a high speed and added with certain amount of alkali solution to be gelled so as to obtain a composite wet gel system; by utilizing a supercritical drying method, a nanometer magnetic Fe3O4/SiO2 composite aerogel material is prepared by drying, and a nanometer magnetic Fe3O4/SiO2 composite aerogel material with stable dispersion, no obvious agglomeration and even distribution is further prepared; and finally, the composite aerogel material is ball-milled to obtain the nanometer magnetic Fe3O4/SiO2 composite aerogel particle. The preparation method has the advantages of simple and practical process and easy control of the preparation process, and the prepared nanometer magnetic Fe3O4/SiO2 composite material is stable in quality.

The invention relates to a method of preparing polymer asphalt with one step to modify the asphalt by adopting the polymer as a modifying agent. In a peptizator of 80 to 160 DEG C which account for 5 to 27 percent of the total weight of the raw materials, the polymer modifying agent and 0.1 to 2 percent of stabilizer which account for 2 to 9 percent of the total weight of the raw materials are added, and then is poured into a plastic extruder where the rotating speed is 300 to 800 rotations per second to be extruded; the extruding temperature is controlled to be 130 to 210 DEG C; the extruded polymer is directly and mixingly stirred for 0.5 to 6 hours together with the asphalt which accounts for 62 to 89.9 percent of the total weight of the raw materials, then the polymer modified asphalt is gained, which is provided with good heat preservation function, good low temperature expanding performance, anti-fatigue and anti-tearing function and relatively good weatherproof function. After being mixed with the stones, the mixed materials perform good water stability and high and low temperature stability, which can effectively improve the using performance of the asphalt pavement and prolong the service life.

The invention relates to the field of a new material, in particular relates to the technical field of preparation and application of a functional high-polymer material, and discloses a preparation method of graphene modified waterborne polyurethane. According to the method disclosed by the invention, firstly, graphene is modified by a coupling agent and then is blended with waterborne polyurethane so as to implement excellent dispersion; meanwhile, a secondary chain extension mode is adopted and an interpenetrating network structure is introduced; after resin prepared by the method is formed into a film, the film has excellent hardness, flexibility, compactness, impact resistance, corrosion resistance, water resistance, aging resistance, pollution resistance and the like, and can be applied to the fields of automobile coating, wood lacquer, buildings, office furniture, leather and the like.

The invention provides zinc oxide-based nanoparticle ink. The zinc oxide-based nanoparticle ink comprises a solvent and zinc oxide-based nanoparticles uniformly dispersed in the solvent. The zinc oxide-based nanoparticle ink comprises, by mass, 0.01 to 20.00% of the zinc oxide-based nanoparticles and 80.00 to 99.99% of the solvent. The zinc oxide-based nanoparticle ink is characterized in that the solvent comprises at least one alcohol ether ester compound. The zinc oxide-based nanoparticle ink can solve the problem that the existing zinc oxide-based nanoparticle ink is not suitable for ink-jet printing and has poor film-forming quality. The invention provides an electroluminescent device. An electron transport layer of the device is prepared from the zinc oxide-based nanoparticle ink through ink-jet printing.

The invention discloses a preparation method of a tough graphene/cellulose composite heat-conductive and electro-conductive film. The preparation method of the tough graphene/cellulose composite heat-conductive and electro-conductive film comprises the following steps: firstly, dispersing the wood pulp into an aqueous solution to peel the wood pulp into single nano diameter single fibrous bundles under the action of liquid shear force; diluting the single fibrous bundles with deionized water and obtaining the low concentration cellulose aqueous solution through treating by a high-speed shearing machine for a certain period of time; then dispersing the industrial graphene nanosheets evenly into the aqueous solution containing the dispersant through ultrasonic treatment; then dripping the prepared cellulose aqueous solution gradually into the graphene dispersion; and preparing the graphene/cellulose composite film through ultrasonic mixing, suction filtration, drying and other processes. The obtained film has good flexibility, thermal conductivity and electrical conductivity, and the mechanical, thermal and electrical properties of the film can be further improved through hot pressing treatment. The preparation method of the tough graphene/cellulose composite heat-conductive and electro-conductive film has the advantages of simple process, low cost, green environment protection and wide application value in the field of functional composite materials.

The invention relates to a preparation method of a polyvinylidene fluoride (PVDF)-based thin film. According to the thin film forming process, through an extrusion casting and drawing method, PVDF, polymethyl methacrylate (PMMA), a rubber elastomer, titanium dioxide as well as other auxiliaries and fillers are mixed according to a certain ratio and are melted and extruded at certain temperature, and then the PVDF-based thin film is formed under guiding and stretching effects of casting traction equipment. The PVDF-based thin film prepared by the invention is uniform and easily controllable in thickness, good in barrier property as well as excellent in mechanical property and environmental aging resistance, and is easy to realize industrialization; the PVDF-based thin film, through modification treatment, is significantly improved in surface caking property and guarantees good adhesion with a solar cell packaging material; the thin film brings high convenience for assembly of a solar cell backboard film and is compact in structure; and the thin film has good application prospect in solar cell industry.

The invention discloses a zinc-oxide-based nanometer particle ink and a preparation method thereof. The zinc-oxide-based nanometer particle ink comprises the following components, by weight percentage, 0.01-20.0% of zinc-oxide-based nanometer particles and 80.0-99.99% of a solvent. The solvent comprises at least one low-boiling-point alcohols solvent and at least one high-boiling-point alcohols solvent, wherein the amount of low-boiling-point alcohols solvent is 1.0-80.0% of the total amount of the solvent. According to an ink formula in the invention, zinc-oxide-based nanometer particles can be dispersed in the solvent, and the viscosity of the solvent is improved and the volatilization speed of the solvent is lowered by adjusting low-boiling-point alcohols with high-boiling-point alcohols. The ink can meet the index requirements, such as ink viscosity and volatilization speed, of ink-jet printing, and zinc-oxide-based nanometer particles of the ink can be uniformly stably dispersed in the solvent.