30results about How to "Won't lose powder" patented technology

The invention discloses a ceramic coating diaphragm for a lithium battery and a preparation method of the ceramic coating diaphragm, and belongs to the technical field of batteries. The ceramic coating diaphragm comprises a ceramic coating and a substrate diaphragm, wherein the ceramic coating is prepared by uniformly coating the substrate diaphragm with water-based ceramic coating slurry; the ceramic coating slurry comprises components in percentage by weight as follows: 10%-30% of aluminum oxide, 0.5%-3% of a bonding agent, 0.2%-1.0% of an additive and 0.01%-0.1% of an auxiliary; and the aluminum oxide is nanometer aluminum oxide powder with the grain diameter ratio D1/D2 of 0.10-0.20. According to the technical scheme, the safety of the ceramic coating diaphragm is improved, the wetting ability of electrolyte is improved, and the cycle life of the battery can be prolonged when the ceramic coating diaphragm is applied to the lithium battery.

The invention provides a polyimide thin film for preparing an artificial graphite film with excellent mechanical properties and a preparation method of the polyimide thin film. The polyimide thin film is prepared from a raw material diamine monomer which comprises 0 to 75 mol ratio of p-phenylenediamine; the raw material dianhydride monomer, comprises 40 percent to 100 mol ratio of of pyromellitic dianhydride; two types of inorganic fillers, including a calcium-containing compound and transition metal oxide, are uniformly dispersed in the polyimide thin film. The polyimide thin film provided by the invention is applicable to a graphitization process of single-sheet, multilayered stacking and continuous coiled materials and can be used for carrying out graphitization at temperature of 2300 DEG C; the crystallization degree is less than 10 percent. The graphite film prepared from the polyimide thin film has an excellent heat conducting property and has excellent mechanical properties in longitudinal and lateral directions of the thin film; the modulus is less than or equal to 2000MPa, the elongation at break is more than or equal to 3 percent, the tensile strength is more than or equal to 40MPa and the difference of the longitudinal and lateral directions is less than 15 percent.

The invention discloses a high temperature resistant battery diaphragm containing a cellulose fiber substrate and a preparation method thereof. The high temperature resistant battery diaphragm has a thickness of 20-40micrometer, a porosity of 40-60%, and air permeability of 15-30sec/100cc. The diaphragm includes a cellulose fiber substrate, a porous adhesive layer and an inorganic coating. The preparation method includes: subjecting an aqueous polyurethane emulsion to mechanical foaming, conveying a foam glue to a foam bath device, immersing the cellulose fiber substrate by traction into foambath for gluing, and letting the foam glue form the porous adhesive layer on the substrate surface; coating the cellulose fiber substrate and the porous adhesive layer with an inorganic paint, conducting compounding to form an inorganic coating; and performing drying. The high temperature resistant battery diaphragm provided by the invention has the advantages of good imbibition and liquid retention ability, no shrinkage, longitudinal and horizontal hot shrinkage both below 2%, high ion penetrability, low resistance, excellent mechanical properties, and stable electrochemical properties, and can prevent battery short circuit and dendrite piercing.

The invention relates to the technical field of dental instruments, in particular to a bone meal conveyor. The bone meal conveyor comprises a bone meal container, a conveying component and a stirring component, the bone meal container is vertically arranged on the horizontal plane and is in an inverted cone shape, a first containing cavity is formed in the bone meal container, the conveying component is arranged in the first containing cavity in the bone meal container, a hollow structure is arranged at the output end of the conveying component, the taper of the conveying component is consistent with that of the bone meal container, the stirring component is arranged in the hollow structure at the output end of the conveying component, the distance entering the maxillary sinus can be accurately controlled by utilizing an outer ring sleeve on the outer side wall of the conveyor, and the maxillary sinus is prevented from being damaged in the conveying process; the bone meal is filled into the maxillary sinus, a funnel-shaped outlet is large, the bone meal can be rapidly and effectively conveyed into the maxillary sinus for filling at a time, the speed is high, powder falling is avoided, operation of medical staff is facilitated, the bone meal filling effect is good, the filling operation time is greatly shortened, and the bone meal in the maxillary sinus can be evenly stirred.

The invention relates to a silicon nitride composite separator and a preparation method thereof. The preparation method comprises the following steps: at a temperature of -50 DEG C to -30 DEG C, immersing the separator with liquid monosilane for 5-30 min, then immersing the separator with liquid ammonia for 10-120 min, so as to depositing silicon nitride on the separator surface, and finally performing vacuum drying to obtain the silicon nitride composite separator. By employing the one-step synthetic technology, silicon nitride is effectively uniformly distributed on the separator surface. Because no adhesives are used and a high-temperature sintering process is not used, the silicon nitride composite separator has good heat resistance and is not easy to dust, and thus the safety of a battery is improved. Additionally, the whole preparation process is simple, the raw material cost is low and batch production is easy to realize.

The invention discloses a PC/ABS composite material of a metal texture. The composite material is prepared from the following components in parts by weight: 65-98 parts of resin, 0-2 parts of pearl resin, 0.05-0.1 part of silicone oil, 0.5-5 parts of a metal pigment, 0.5-1.5 parts of an extractant, 0.5-1 part of an adsorbent, 0.2-1 part of a processing heat stabilizer, 0.1-2 parts of a processinglubricant and 0.5-25 part of other functional auxiliary agents. The resin is a mixture of polycarbonate and ABS resin in a proportion of 1: 1. The composite material is high in strength, good in stability, high in processibility, high in metal texture and high in interfacial strength, does not drop powder, and is free of harmful volatile organic compounds, so that the problem of environmental pollution caused by follow-up processing is avoided, and the composite material is more environment-friendly and safe.

The invention discloses a preparation method of a lithium battery negative pole piece. The preparation method comprises the following steps: S1, mixing CMC, a negative active substance, a conductive agent and deionized water to form a solution A; S2, continuously adding SBR and a carbon precursor into the solution A, and performing stirring to form slurry; S3, coating a copper foil with the slurryto form a wet film pole piece; and S4, heating the wet film pole piece to 270-330 DEG C to obtain the lithium battery negative pole piece. According to the preparation method of the negative pole piece provided by the invention, the addition amount of the SBR is reduced, a small amount of carbon precursor is added, and the carbon precursor is heated and decomposed to form a carbon chain with functional groups such as carbonyl and double bonds, so that battery cell expansion caused by SBR swelling is slowed down in the processes of adding electrolyte and charging and discharging, and the polepiece does not drop powder due to reduction of the adding amount of the SBR.

The invention relates to the technical field of anode materials of batteries, and particularly relates to a method for improving an anode aluminum foil current collector performance. The method is characterized in that the surface of an aluminum foil is preprocessed with a preprocessing solution, so that stains on the surface of the aluminum foil can be cleaned, and a metal substrate is completelyexposed; moreover, some acid group anions can be loaded onto the surface of the metal substrate, so that the metal substrate without being washed can be processed in a sodium fluoborate solution, andthus the formation of a microporous film on the surface of the metal substrate can be facilitated; the toughness of the aluminum foil is improved, and the aluminum foil can be closely combined with an adhering agent, the adhering intensity is improved, and the peeling strength is improved.

The invention discloses a production process of a flame-retarding polystyrene foam board. The process includes: spraying a flame-retarding agent solution onto the upper or lower surface of a polystyrene foam board; sucking the flame-retarding agent solution, from the corresponding upper or lower surface of the polystyrene foam board, away by using a vacuumizing device; and air-drying the polystyrene foam board. The production process is environment-friendly and the product has good flame-retarding effect.

The invention relates to a heat-preservation and sound-absorption paste material for a roof and a preparation method thereof. The heat-preservation and sound-absorption paste material is prepared from the following components in parts by mass: 50-60 parts of water, 2-5 parts of an organic cementing material, 1-3 parts of a silicate solution, 3-5 parts of an auxiliary agent, 5-20 parts of coarse Poraver beads, 5-10 parts of fine Poraver beads, 5-25 parts of hollow glass beads, 1-15 parts of fibers, 2-6 parts of filling powder and 1-3 parts of an additive, the bulk density of the coarse Poraver beads is 110-150kg/m < 3 >, and the particle size D90 of the coarse Poraver beads is less than or equal to 2mm; the bulk density of the fine Poraver beads is 180-220 kg/m < 3 >, and the particle size D90 of the fine Poraver beads is 0.3 mm. The invention has the advantages of high sound absorption coefficient, wide sound absorption frequency band, fast construction, seamless surface, safety, environmental protection and the like.

The invention discloses silver-loaded expanded graphite prepared by extra-large flaky graphite and preparation and application thereof. The expanded graphite is loaded with silver nanoparticles, and is prepared by the extra-large flaky graphite. Specific methods comprise an impregnating reducing method, a coating method and a spraying method; the impregnating reducing method adopts a non-toxic reducing agent to simultaneously reduce oxygen-containing functional groups and silver ions of the graphite; the coating method refers to coat a layer of silver nitrate solution onto the expanded graphite; the spraying method refers to spray the silver nitrate solution in a mist state onto the expanded graphite. The silver-loaded expanded graphite prepared by the extra-large flaky graphite through the several methods has the advantages that the bacteria sterilizing and inhibiting properties are excellent, the methods are simple, the operation is easy, the cost is low, and the methods are suitable for being popularized and applied; the silver-loaded expanded graphite prepared by the extra-large flaky graphite is used for wound dressings, the sticking with wounds is avoided in the use process, the pain is relieved, and the healing of the wounds is promoted; the bacteria sterilizing and inhibiting properties are excellent, and the infection of the wounds by bacteria is avoided.

The invention relates to a hot-melting veiled car line paste and a preparation method thereof. The car line paste is composed of 100 parts of high-saturated fatty acid, 5 to 10 parts of polyoxyethylene-type nonionic surfactant and 180 to 220 parts of purified water. The preparation method comprises the following steps of: 1) putting the high-saturated fatty acid and the polyoxyethylene-type nonionic surfactant into a container; heating to the temperature of 70 to 80 DEG C and melting, thereby preparing an oil phase; 2) slowly dropwise adding the purified water preheated to the temperature of 70 to 80 DRG C into the oil phase in a stirring manner; after dropwise adding, heating to the temperature of 78 to 85 DRG C; preserving heat and stirring for 30 minutes, thereby obtaining an emulsifying body; and stirring and cooling to the room temperature, thereby obtaining the hot-melting veiled car line paste. By adopting the screen plate printing, a white positioning line formed on the surface of a fabric material is clear, long in retention time and free of blocking a screen plate during the printing process. The positioning line can be automatically molten to disappear after the fabric material is shaped in a processing manner, and cannot generate any residual trace. The raw materials and the product provided by the invention are safe, environment-friendly and free of toxic effect to a human body.

The invention discloses a taste-masking compound famotidine chewable tablet. The compound famotidine chewable tablet is prepared by the following steps: preparing famotidine granules from famotidine and polyoxyethylene water-soluble resin (PEO), preparing calcium carbonate and magnesium hydroxide granules from calcium carbonate and magnesium hydroxide, uniformly mixing the two granules, adding an additional auxiliary material A, and tabletting to obtain the compound famotidine chewable tablet. The chewable tablet can obtain the friability smaller than or equal to 1.0% under the hardness of 40-100 N, is good in stability and has a taste masking effect.

The invention discloses an air purification material and a preparation method thereof. The method includes: step 1: preparing a material capable of decomposing formaldehyde; step 2: preparing macroporous resin, i.e. preparing an initiator; and adding an oil phase into the initiator, wherein the oil phase is prepared by mixing a monomer, a cross-linking agent, a pore-foaming agent and a dispersantand then subjecting the mixture to ultrasonic dispersion uniformly; step 3: adding the material capable of decomposing formaldehyde into the oil phase, and conducting water bath heating to 75DEG C, and maintaining the state for 5h; and step 4: conducting cooling and constant temperature drying, thus obtaining the air purification material.

The invention discloses a high-power-density super-capacitor slurry preparation method. High-power-density super-capacitor slurry comprises active substances AC, binding agents LA132, conductive agents SP and butadiene styrene rubber SBR, the weight ratio of the active substances AC, the binding agents LA132, the conductive agents SP to the butadiene styrene rubber SBR is 90:5:3:2, active substances are increased by 4% as compared with the previous content in a product, the capacity of a product is increased by 4.5% or more, the energy density of the product is improved, the adhesive force ofan aluminum foil can be increased by the aid of two binding agents, the internal resistance of the product is reduced, the power density of the product is improved, mixing time can be effectively shortened by 2 hours, production efficiency is improved by 20%, flexibility of pole pieces is improved, powder falling in rolling and cutting processes is avoided, and scrap caused by short circuit in rolling-in, flattening and shell entering processes is decreased.