50results about How to "Promote pore formation" patented technology

Disclosed is a successively biaxially stretched film obtained by successive biaxial stretching method comprising extruding a melt of a β-crystal nucleating agent-containing polypropylene-based resin composition from a T-die, cooling the extruded resin on a chill roll, and stretching the resulting web sheet longitudinally and then transversely, wherein the longitudinally stretched sheet is made to have a degree of β-crystal orientation of less than 0.3 by the following method (I) and/or (II), optionally subjected to annealing treatment, and transversely stretched:

• • method (I): melting the polypropylene-based resin composition containing needle crystals of a specific β-crystal nucleating agent at a temperature not lower than m.p. of the polypropylene-based resin and lower than dissolution temperature of the β-crystal nucleating agent in the polypropylene-based resin melt, and extruding the melt from the T-die at the same temperature,
  • method (II): adjusting neck-in ratio during longitudinal stretching to 25 to 55%.

The porous polypropylene film has good breakage resistance during manufacture, excellent thickness uniformity, high porosity and air-permeability, and is useful for battery separators.

The invention provides composite petroleum coke-based activated carbon and a preparation method thereof. Activated active sites can be formed on the surface of petroleum coke through the dipping, coking and pre-activating processes of an oxidizing medium, chemical activation part pore-forming is promoted, the use amount of alkali is reduced, the mesopore rate is increased, and the problem that due to the fact that the surface of the petroleum coke is compact, pore forming is difficult is solved. Graphene oxide is reduced into graphene, a conductive network is formed, the conductivity of the activated carbon is improved, and the internal resistance of the activated carbon is reduced. High-temperature heat treatment is carried out jointly, surface functional groups are reduced, and the stability of super-capacitor carbon is improved. The prepared composite petroleum coke-based activated carbon has the advantages of being reasonable in pore size distribution, large in specific surface area, low in internal resistance, high in capacity, low in impurity and low in oxygen-containing functional group and can serve as the super-capacitor carbon, and the super-capacitor with better performance is obtained.

The invention provides a method for preparing anode material carbon coated lithium titanate for lithium ion power batteries, and belongs to the technical field of electrochemical energy materials. According to the invention, titanium dioxides are coated with carbon firstly, and then technological processes of lithiation and calcining are performed, so that a carbon layer coated on the surface of the titanium dioxides both can effectively suppress the size increasing of particles in the process of sintering, and improves the electrical conductivity of lithium titanate materials; and in the process of lithiation, a small amount of lithium oxalate is added in lithium salts, thereby reducing the alkalinity of a solution, and facilitating the melting of TiO2/C. The invention aims to overcome the defects of poor battery rate performance difference and the like caused by the fact that lithium titanate materials prepared by using the traditional solid phase method is large in particle size and poor in electronic conductivity, and provides a method for preparing carbon coated lithium titanate materials which can improve the battery rate performance. The method is simple in process operation, and suitable for large-scale production.

The invention discloses a preparation method of graded porous carbon. According to the technical scheme, the preparation method comprises the steps: firstly, adding a foaming agent into a low-melting-point solid carbon-containing substance, and mixing for later use; then under a certain pressure and atmosphere, heating to a temperature T1, and homogenizing for t1; and under a certain pressure andatmosphere, heating to a temperature T2, carrying out a reaction for t2, heating to a temperature T3, carrying out a reaction for t3, cooling to room temperature, cleaning and drying to obtain the graded porous carbon. The basic concept of the invention comprises that a macroporous structure is formed by a foaming technology, the porosity of the carbon material is further increased by utilizing generated reducing gas, and then more micropores and small mesopores are generated by utilizing cracking and intercalation of anode ions under heat treatment to form porous carbon with a micropore-mesopore-macroporous hierarchical pore structure. The method has the advantages of being high in operability, large in aperture adjusting range, accurate in regulation and control and the like.

The present invention relates to polymeric microparticulates for sustained release of drug and to the process for the preparation thereof. The process of the present invention for preparing polymeric microparticulates based on microcoagulation phenomenon of water-soluble polymer not only improves loading amount of drug but also minimizes initial burst of drug, thereby providing polymeric microparticulates enabling sustained and prolonged release of drug

The invention discloses a honing oilstone and a preparation method and application thereof. The honing oilstone comprises copper, tin, zinc, silver and superhard materials, and further comprises antimony, ferrophosphorus alloy, sodium hexafluoroaluminate, bronze, lubricant and wetting agent, wherein the feeding mass ratio of the copper, tin, zinc, silver, antimony, ferrophosphorus alloy, sodium hexafluoroaluminate, bronze, lubricant and wetting agent is 40-80:10-30:1-10:1-5:1:1-3:1-10:1-3:1-3:0.1-1, and the honing oilstoneis formed by mixing and sintering the raw materials. The preparation includes the steps of weighing raw material except the superhard materials according to the formula, mixing each weighed raw material with the superhard materials, sintering the mixture, and obtaining the honing oilstone. The application is the application of the honing oilstone in processing stainless steel materials. When the prepared honing oilstone is used to process materials difficult to process, such as stainless steel, no cutter adhesion, high precision and good processing surface integrity can be achieved, the preparation of the honing oilstone is simple, the cost is low, and the processing efficiency is high.

The invention belongs to the field of biochar preparation, and particularly relates to a method for preparing biochar from waste biomass pyrolysis residues and the obtained formed biochar. To overcome a technical problem, the invention provides the method for preparing the nitrogen-doped formed biochar from the waste biomass pyrolysis residues. The method comprises the following steps: uniformly mixing the biomass pyrolysis residues and a nitrogen source, then adding a binder, conducting uniform mixing, carrying out extrusion molding, performing drying, and then carrying out oxidation, carbonization and activation to obtain the nitrogen-doped formed biochar. The method is simple in process and low in cost, and the obtained biochar has a good catalytic oxidation or/and adsorption effect on acid gas.

A preparation method of a porous nano polymer composite material comprises the following steps: (1) adding pure attapulgite into a 0.1-0.5 mol/L acid solution, and dispersing by stirring for 0.5 h; (2) adding aniline and gamma-methylacryloyloxypropyl trimethoxysilane, and stirring for 0.5 h; (3) adding ammonium persulfate as an initiator, standing for 0.5 h after stirring; (4) adding acetanilide, and dispersing by stirring for 0.5h; (5) leaching till the mixture is neutral, drying at 60 DEG C, and grinding; (6) washing with ethanol solution, leaching, drying at 60 DEG C, and grinding to obtain the dark green composite material.

The invention discloses a preparation method of biomass porous carbon, which belongs to the technical field of a functional material. The preparation method comprises the following steps: mixing and ball milling vinasse, starch and glycerin, and obtaining ball milled uniform slurry; mixing and fermenting the ball milled uniform slurry, cryolite, modified additives, Carbomer, gum Arabic solution, adding aluminum chloride solution which is 0.2 to 0.3 times of the mass of the ball milled homogenous slurry, stirring and mixing, dropwise adding a sodium hydroxide solution, adjusting pH to 10.3 to 10.6, drying, pulverizing, screening, and obtaining a blank; gradually heating the blank in a nitrogen atmosphere, electrifying, reacting at the high temperature, cooling, and obtaining a carbonized blank; and mixing the carbonized blank and water according to a mass ratio of (1:10) to (1:20), soaking the carbonized blank, filtering, and drying, thus obtaining the biomass porous carbon. The biomassporous carbon provided by the invention has excellent specific surface area and porosity.

The invention relates to the technical field of active coke, in particular to an active coke preparation method and preparation device. The active coke with large specific pore volume, high specific surface area and good adsorption performance can be obtained. The active coke preparation method includes the steps: 1) performing gasification reaction or pyrolysis reaction on pulverized coal to obtain semi-coke with preset structural parameters; 2) performing activating reaction of the semi-coke and activators to obtain the active coke. The preset structural parameters indicate that the carbon content of the semi-coke is larger than or equal to 80%, the specific pore volume is larger than or equal to 0.2cm<3>/g, and granularity is smaller than or equal to 250 micrometers. The active coke preparation method is used for preparing the active coke.

The invention relates to the field of silicon carbide ceramics, and particularly discloses a porous silicon carbide ceramic and a preparation method thereof. The porous silicon carbide ceramic comprises the following components in parts by weight: 80-100 parts of silicon carbide micro powder, 2-10 parts of a sintering aid, 1-5 parts of a pore-forming agent, 1-5 parts of a cross-linking agent, 3-6 parts of a dispersing agent and 45-55 parts of deionized water, wherein the pore-forming agent is straw micro powder with the particle size of 1-30 [mu]m. The preparation method comprises the steps: mixing and stirring the silicon carbide micro powder, the sintering aid, the cross-linking agent, the dispersing agent and the deionized water, then adding the pore-forming agent and a permeation accelerating agent, and stirring under a vacuum condition to obtain silicon carbide ceramic slurry; and performing vacuum suction filtration on the silicon carbide ceramic slurry, putting the silicon carbide ceramic slurry into a mold, baking to obtain a porous silicon carbide ceramic biscuit, and sintering the porous silicon carbide ceramic biscuit in an argon atmosphere to obtain the porous silicon carbide ceramic. The porous silicon carbide ceramic prepared by the preparation method is good in environmental protection property, low in cost, large in porosity and excellent in performance.

The invention belongs to a method for preparing sulfur-oxygen co-doped porous carbon from paper, particularly waste paper. The sulfur doping content of a porous carbon material is regulated and controlled through hydrothermal synthesis of a sulfuric acid solution by utilizing hydrothermal synthesis and high-temperature pyrolysis technologies on the basis of inherent structural characteristics of the paper; and the S and O co-doped porous carbon material is prepared through KOH assisted pyrolysis. The sulfur element doping amount of the prepared porous carbon material can be regulated to 0.3 at%-4at%, and the material presents a reticular hierarchical pore structure. A symmetrical capacitor assembled by taking the material as an electrode has the specific capacitance retention rate of 96% after 10000 times of circulation, has good electric circulation stability, and is worthy of market popularization and application.

The invention relates to a preparation method for a high-efficiency catalyst of a fixed bed vinyl acetate synthetic reaction. The method comprises the following steps: step 1, selecting materials frombase carbon; step 2, performing acidification treatment; step 3, performing alkalization treatment; step 4, performing pressurization for isolating air; step 5, performing composite activation; step6, performing loading; and step 7, obtaining a finished product. The preparation method provided by the invention has the beneficial effects that the method breaks through a raw material infiltrationtreatment technology, and is more beneficial to activation pore formation; the method broadens selectivity of types of an activator and opens up a new activation pathway; the method broadens activation conditions and makes activation more full; and moreover, the method greatly improves quality of the activated carbon catalyst.

The invention relates to a reed flower biochar-based electrode material and a preparation method thereof. The preparation method comprises the steps of carbonizing reed flowers in a nitrogen atmosphere, and performing high-temperature activation and nitrogen doping by taking potassium hydroxide as an activating agent and a nitrogen-containing compound as a nitrogen doping agent to obtain reed flower biochar; and mixing the reed flower biochar with acetylene black and polytetrafluoroethylene emulsion, tabletting and drying to obtain the reed flower biochar-based electrode material. The reed flowers are selected to prepare the electrode material, carbonization, activated pore-forming and nitrogen doping are completed in one step, and the preparation process is simple and easy to operate; the selected nitrogen-containing compound such as diethanol amine has hydroxyl and can chemically react with carboxyl on the surface of reed flowers, so that the nitrogen-containing compound can be better combined with biomass carbon, and the nitrogen doping amount is high; and meanwhile, diethanol amine has alkalinity and water solubility, can easily enter the plant fibers, is easier for pore forming in the high-temperature carbonization process, and serves as a nitrogen doping agent and an auxiliary pore forming agent in the biochar-based material preparation process.