122results about How to "Easy to disperse evenly" patented technology

The invention discloses a coated-modified lithium manganese positive electrode material and the preparation method thereof. A manganese source compound, an M source compound and a lithium source compound are taken as raw material for preparing LiaMn2 -bMbO4 particles, and then are mixed with molten solvent and A-source compound, so as to obtain coated-modified lithium manganese positive electrode material. Compared with the prior art, the LiaMn2-bMbO4 particles are similar to spheres in shape and are in crystal face connection through curved surfaces which have no clear edges; on one hand, the LiaMn2 -bMbO4 particles have very small specific surface area, so that molten solvent and coating material are more evenly dispersed on the surfaces of the particles, and the control to average thickness of a coating is facilitated; on the other hand, the features have very small surface energy, the coating material is enabled to be more easily to be combined with the LiaMn2 -bMbO4 particles to form the coating. Therefore, the coated-modified lithium manganese positive electrode material has an excellent high temperature cycling performance.

The invention discloses a macroscopic preparation method of a cellulose nanocrystal (CNC), which is green and environment-friendly. Firstly, cellulose is crushed and then is pretreated; afterwards, an oxometallate solution and an organic acid are added, the oxydrolysis is carried out, and the CNC with a carboxyl group on a surface is obtained after centrifugal dialysis treatment. The yield of the preparation method can exceed 70 percent; the length of the made CNC can be adjusted in the range of 195nm to 260nm; the content of the carboxyl group on the surface can reach 50mmol/g; compared with a CNC made by a sulfuric-acid acid hydrolysis method, the CNC made by the macroscopic preparation method provided by the invention is increased by 50 to 100 DEG C in heat resistance; used oxometallate and organic acid are both green reagents and are further a few in use levels; problems that the preparation cost of the CNC is high and further the environmental pollution is easily caused, and the like, at present are solved.

The invention discloses a suspension preparation of temperature change painless nano sulfadiazine metallic compound hyaluronic acid. The formula comprises a sulfadiazine metallic compound, a hyaluronic acid substance, an analgetic, a dispersing agent aid, a suspension aid and water, wherein the sulfadiazine metallic compound comprises sulfadiazine silver and sulfadiazine zinc; the hyaluronic acid substance is sourced from biological fermentation and animal tissue extraction and the like and can be hyaluronic acid or hyaluronate or crosslinked hyaluronic acid or crosslinked hyaluronate; the analgetic comprises ropivacaine, bupivacaine, levobupivacaine, lidocaine and other local anesthetics or combination of the local anesthetics; the dispersing agent aid comprises chlorhexidine, Tween series, oleic acid or sodium oleate; the suspension aid can comprise glycerinum, celluloses, poloxamer series and hyaluronic acid substances. The suspension preparation is mainly used for burn, scald or the surface of a wound caused by explosion or anabrosis, has the main clinical characteristics that pain is rapidly relieved, the surface of the wound is subjected to rapid film formation and rapid healing of the wound is promoted, and the conventional main administration modes refer to spraying, smearing and coating.

The invention relates to a metal appearance-imitated polypropylene-surlyn composite material and a preparation method thereof. The metal appearance-imitated polypropylene-surlyn composite material isprepared from the following components in parts by weight: 55-85 parts of polypropylene, 5-25 parts of surlyn, 0-10 parts of flexibilizer, 0-15 parts of enhancer, 0.3-0.8 part of antioxidant, 0.2-1 part of lubricant, 0.2-0.4 part of light stabilizer, and 1-3 parts of special effect toners. The surlyn has high low temperature impact resistance, and can remarkably improve the low temperature brittleness of a PP material after being added, the composite material has transparency and high gloss, and can remarkably improve the surface gloss of the composite material, so that the visual effect of metal is more outstanding; and the composite material has high scratch resistance, and can be remarkably improved in scratch resistance.

The invention relates to an in-situ reaction forming device for a differential and integral calculus laminated polymer composite material and an in-situ reaction forming method. The device comprises a plasticizing feeding device, a flow collector, a laminator and a forming device which are sequentially in series connection from front to back. Methods for processing a base layer and an adhesive layer in the differential and integral calculus laminated polymer composite material are unchanged, a functional layer is made of monomer or low polymer and the like which serve as raw materials instead of traditional high polymer, and a vacuum reactor is used as the plasticizing feeding device, so that the problem of difficulty in differential and integral calculus laminated composite of the composite material with base layer materials with low processing temperature is solved. By the aid of in-situ reaction forming technology for the functional layer, corresponding polymer modified auxiliaries can be selected according to different base materials, modifying effects are remarkable, the functional layer is thinner and even far thinner than the base layer, and raw materials are saved. Moreover, negative effects of high time consumption, degradation and the like caused by repeated hot processing are avoided as the functional layer is polymerized at one step.

The invention relates to a polypropylene-surlyn resin composite material. The composite material comprises, by weight, 55-85 parts of polypropylene, 5-25 parts of surlyn resin, 3-5 parts of HDPE, 0-10parts of a toughening agent, 0-15 parts of an enhancer, 0.3-0.8 part of an antioxidant, 0.2-1 part of a lubricant, 0.2-0.4 part of a light stabilizer and 1-3 parts of special effect color powder. Thesurlyn resin has excellent low-temperature impacting performance, the low temperature brittleness of a PP material can be significantly improved, the surlyn resin is transparent and has high glossiness, the surface gloss level of the composite material can be significantly improved after the surlyn resin is added, a metal imitation visual effect is more outstanding, the surlyn resin has higher scratching resistance, and therefore the scratching resistance of the material can be significantly improved.

The invention relates to a macromolecule nucleating agent used for polylactic acid and an application method. The macromolecule nucleating agent is polyvinyl acetal, and polyvinyl acetal is mixed with polylactic acid by in-situ polymerization or in an addition manner in a processing process, so as to regulate the nucleating property of polyvinyl acetal. The macromolecule nucleating agent has no toxicity or corrosivity, is odorless and is dispersed easily. Polyvinyl acetal, which serves as the macromolecule nucleating agent, can enable the peak crystallization temperature of polylactic acid to be risen obviously, so that the crystallinity and the crystallization velocity are improved remarkably, the crystallization period is shortened obviously, and the mechanical property of resin is improved more obviously.

Relating to woodceramic materials and their preparation methods, the invention provides electroconductive woodceramic powder and its manufacturing method, and solves the technical problems of great brittleness and easy cracking in bulk woodceramic materials. The electroconductive woodceramic powder of the takes woodceramic powder as the core, the surface of which is chemically plated with electroconductive powder of a layer of metal film, and the metal attaching amount is 1%-50% of the mass of the woodceramic powder, wherein, the metal is nickel, iron or cobalt. The preparation method consists of: subjecting the woodceramic powder to oil removal, oxidation, sensitization, activation, and dispergation, then placing the woodceramic powder into a chemical plating solution for chemical plating, and conducting filtration and washing by deionized water to neutral, then carrying out drying, thus obtaining the electroconductive woodceramic powder with volume resistivity of 4.5*10<-2>omega.cm-5.5*10<-1>omega.cm. The electroconductive woodceramic powder in the invention can be added into coatings for preparing electroconductive coatings, or the powder can be added into resin-based materialsfor preparing molding materials, thus having a wide application range. The electroconductive woodceramic powder in the invention can be used as an electromagnetic shielding material.

The invention relates to a skin preparation for external application, which has remarkable efficacies of being anti-inflammatory, relieving itching and sterilizing, and can serve as a treating medicine and /or be used in different forms or different purposes of serving as a disinfector, health article, and the like, for assisting in treatment. The skin preparation aims at solving the technical problem of causing active ingredients to be evenly spread in accessorial added ingredients. The main improvement of the skin preparation for external application is that at least one of borneol and menthol is added in an accessory system in a liquid form and other active ingredients are added in the accessory system in a powder form for preparing. After improvement, the skin preparation for external application is easier to be spread evenly, also reduces material loss caused by grinding and simultaneously improves the percutaneous performance of drugs.

The invention discloses a conductive aluminum paste for a back passivation solar cell. The conductive aluminum paste comprises various components having following weight percentages: 70-80% aluminum powder, 0.5-5% inorganic glass, a 1-15% organic carrier and a 0.1-10% tensile force additive. The tensile force additive is uniformly dispersed in the conductive aluminum paste, molecular bridges can be built between interfaces of inorganic and organic substances when the conductive aluminum paste is sintered, and the two kinds of materials with great disparity in nature are connected together to improve performance of a composite material and increase bonding strength, so a tensile force of the conductive aluminum paste is formed in the condition that a back field passivation layer is not damaged, the process defective rate of follow-up assemblies is reduced then, and photoelectric conversion efficiency of the cell is improved.

The invention belongs to the technical field of polymer material preparation, relating to an increased polyvinylidene fluoride hollow fiber porous membrane and a preparation method thereof. The preparation method comprises the following steps: dispersing powdery saccharide compounds in organic solvent first and dissolving polyvinylidene fluoride with the solvent to form casting film polymer solution; and preparing a hollow fiber by a gelling phase inversion method; retaining powdery materials in a solid while using a precipitated medium to solidify polymer, and dissolving a saccharide powderymaterial by a hydrolysis method to retain a micropore structure; and controlling the molecular weight of powdery saccharide compounds and the size and quantity of powder particles to obtain films withdifferent apertures and porosity factors. The formula of polymer solution comprises the following components in percentage by weight: 15-30 percent of polyvinylidene fluoride, 40-75 percent of organic solvent and 10-30 percent of powdery saccharide compounds; and the invention has simple and easily-controllable process steps, reasonable film pore size, excellent film structure, favorable performance and low preparation cost and is suitable for industrial production.

The invention relates to white light LED (Light Emitting Diode) fluorescent powder with a chemical formula Sr(3-x)MgSiO7:xTb<3+>, wherein x is more than or equal to 0.01 and less than or equal to 0.25. The invention also provides a preparation method of the white light LED fluorescent powder. The preparation method comprises the following steps of: weighing silicon dioxide, magnesia, strontium carbonate and tetraterbium heptoxide; adding a charge compensator and a fusing assistant; mixing and grinding the raw materials; and feeding the mixture in a roasting crucible for roasting; cooling, crushing, washing and sieving to obtain the white light LED fluorescent powder. The white light LED fluorescent powder disclosed by the invention has the advantages of low price of raw materials, simple synthetic method, low loss of equipment, no need of special high-temperature equipment and the like.

The invention discloses a high-heat-conductivity high-molecular polymer composite heat-conducting material and a preparation method thereof, and relates to the technical field of heat-conducting materials, and the high-heat-conductivity high-molecular polymer composite heat-conducting material is obtained by adding an Ag/MXene sheet composite material into a high-molecular polymer heat-conducting material matrix; the invention also discloses a preparation method of the high-heat-conductivity high-molecular polymer composite heat-conducting material, which comprises the following steps: dispersing the Ag/MXene sheet composite material into an organic solvent, then adding into a polyurethane prepolymer, and heating, stirring and dispersing in a protective atmosphere; and adding polyisocyanate and a catalyst into the reaction system, heating, stirring for reaction, removing bubbles from the mixed material, pouring into a mold, and curing, thereby obtaining the product. The Ag nano particles and the two-dimensional MXene sheet material have a synergistic effect in heat conduction performance, the Ag/MXene sheet composite material is added into a high-molecular polymer heat conduction material matrix such as polyurethane, the heat conduction performance of the material can be remarkably improved, and the material can be applied to an electronic packaging material; and the preparation method is effective, controllable, economical and environment-friendly.

The invention discloses a novel preparation method for LED (Light Emitting Diode) fluorescent powder. The method comprises the following steps of: based on a chemical formula of Y4-x-yGdGa5R1-2O16:Ce<3+>xEu<2+>y, weighing yttrium oxide, gallium oxide, gadolinium oxide, alkaline earth, cerium oxide and europium oxide according to a molar ratio respectively, wherein X is equal to 0.05-0.10; Y is equal to 0.01-0.10; adding 1-8 percent of mixed fluxing agent including barium fluoride, cerium fluoride and yttrium fluoride to obtain a mixture; uniformly mixing the mixture in a mixer; filling in a baked corundum crucible; placing in a high-temperature furnace to heat; introducing nitrogen and hydrogen mixed gas or pure hydrogen as a reducing atmosphere; preserving heat; heating to bake; cooling and then crushing; and washing and then screening to obtain the LED fluorescent powder. The fluorescent powder has a wide wave spectrum range; and emission spectrum of 530-630nm can be obtained when the fluorescent powder is excited by light of 440-460nm.

The invention discloses a method for increasing color saturation of yellow fluorescent powder used for a light-emitting diode (LED) on the premise of not sharply decreasing the luminance of the fluorescent powder. The method comprises the steps of adjusting the proportion of red light components and blue light components in an emission spectrum of the yellow fluorescent powder to some extent, improving the smooth degree of the surfaces of composite powder particles, selecting raw materials, mixing, burning and crushing the selected materials, rolling the materials to powder, sieving, secondary sintering, cleaning and drying the powder, and the like. The finished product of yellow fluorescent powder used for the LED has the advantages that the appearance is regular, the surfaces of powder particles are smooth, the liquidity is good, the powder is easy to be evenly dispersed in packaging glue, and especially, the CIE (International Commission on Illumination) coordinate of the power is improved, namely the color saturation of the powder is improved.