1431 results about "Apparent density" patented technology

The spherical catalyst carrier is prepared with alcoholated magnesium chloride containing double-ether compound in emulsifying pelletizer. Liquid titanium halide compound is carried onto the spherical catalyst carrier to form spherical solid catalyst component in the presence of electron donor. In the X-ray diffraction spectrogram, the spherical solid catalyst component has diffraction peak in 13.3 deg of 2theta angle, strongest diffraction peak in 26.5 deg of 2theta angle and no characteristic diffraction peak of alpha-anhydrous MgCl2 in 15 deg of 2theta angle. The catalyst of the presentinvention has very high activity and may be used to produce polymer with good form, high apparent density and less fine powder. The catalyst is used in homopolymerization and copolymerization of olefin and suitable for various polymerization process.

A honeycomb structure including a plurality of porous ceramic members which are bonded through an adhesive layer, each of the porous ceramic members has a plurality of cells, which are arranged in parallel while being separated by cell walls. The cells extend in a longitudinal direction of the honeycomb structure. In the honeycomb structure, the following relationship is satisfied:

2≦B≦100/3×A−10/3  (1)

where A (g/cm³) designates apparent density of the porous ceramic members, and B (GPa) designates Young's modulus of the adhesive layer.

Methods and compositions useful for subterranean formation treatments, such as hydraulic fracturing treatments and sand control that include porous materials. Such porous materials may be selectively configured porous material particles manufactured and/or treated with selected glazing materials, coating materials and/or penetrating materials to have desired strength and/or apparent density to fit particular downhole conditions for well treating such as hydraulic fracturing treatments and sand control treatments. Porous materials may also be employed in selected combinations to optimize fracture or sand control performance, and/or may be employed as relatively lightweight materials in liquid carbon dioxide-based well treatment systems.

The invention provides nitrogen mixed grapheme hydrogel of which the water content is 90 to 99.5 percent, the electric conductivity is 10-3-100 S/m, and the molar ratio of N and C is 1 to 25 percent. The invention further provides nitrogen mixed aerogel of which the molar ratio of N and C is 2 to 20 percent, the molar ratio of C and O is 15 to 5, nitrogen atoms existing in the form of amidogen nitrogen accounts for 40 to 70 percent, pyridine type nitrogen accounts for 10 to 40 percent, graphite type nitrogen accounts for 10 to 30 percent, the specific area is 300 to 1500 m<2>/g, the apertures which are micropore account for 10 to 20 percent, the apertures which are mesoporous 20 to 50 percent, the apertures which are macropore 30 to 70 percent, the apparent density is 0.01 to 0.2 g/cm<3>, the pore volume is 5 to 20 cm<3>/g, and the electric conductivity is 1 to 1000 S/m. The nitrogen mixed grapheme hydrogel or aerogel and preparation method thereof provided by the invention has the characteristics that the operation is simple, the equipment requirement is low, the production efficiency is high, the scale-up of the technology is easy, the nitrogen mixed content is controllable and the compounding with other functional substances is simple.

Polycrystalline gallium nitride (GaN) characterized by having the atomic fraction of gallium ranging from between about 49% to 55%, an apparent density of between about 5.5 and 6.1 g/cm³, and a Vickers hardness of above about 1 GPa. Polycrystalline GaN can be made by hot isostatic pressing (HIPing) at a temperature ranging from about 1150° C. to 1300° C. and a pressure ranging from between about 1 and 10 Kbar. Alternatively, polycrystalline GaN can be made by high pressure/high temperature (HP/HT) sintering at a temperature ranging from about 1200° to 1800° C. and a pressure ranging from about 5 to 80 Kbar.

A lyophilized solid composition of taxane (preferably docetaxel and paclitaxel), is suitable to prepare a pharmaceutical formulation to be administered to mammals, particularly humans, comprising a taxane, a tensoactive, a lyophilizing excipient, and acid; also essentially free from organic solvents. The solid composition is free from polysorbate 80 and polyoxyethylated castor oil; it is sterile; it is soluble in aqueous solutions in the absence of organic solvent and it has an apparent density from 0.05 g/ml to 0.45 g/ml. A procedure of double lyophilization obtains a solid composition of taxane. A pharmaceutical formulation of a taxane comprises a solid composition of lyophilized taxane and a solubilizing composition. A kit comprises the compositions and a syringe.

The invention provides a porous scaffold for tissue engineering which allows easy cell engraftment and cell culture and thus enables stable organization and an artificial blood vessel which exhibits high patency rate even if the inner diameter is small. The scaffold for tissue engineering is made of thermoplastic resin which forms a porous three-dimensional network structure having communication property, wherein the porous three-dimensional network structure has an average pore diameter of from 100 to 650 μm and an apparent density of from 0.01 to 0.5 g/cm³. The artificial blood vessel is composed of this scaffold.

The invention provides a cuff which allows easy infiltration of cells from living subcutaneous tissues, easy engraftment of cells, and neovascularization of capillary vessels so as to obtain robust bonding with subcutaneous tissues and, as a result, ensures separation of a wounded portion from the outside, thereby blocking exacerbation factors such as bacterial infection on healing and inhibiting progression of downgrowth. That is, the invention provides a cuff with none or little infection trouble such as tunnel infection. The cuff comprises a porous three-dimensional network structure which is made of thermoplastic resin or thermosetting resin and has communication property, wherein the porous three-dimensional network structure has an average pore diameter of from 100 to 1000 μm and apparent density of from 0.01 to 0.5 g/cm³.

The invention provides a biological implant covering member which allows easy infiltration of cells from living subcutaneous tissues, easy engraftment of cells, and organization, thereby obtaining robust bonding with native tissues and therefore protecting a living body from adverse effect which may occur due to the insertion of a biological implantation member into the living body. The biological implant covering member comprises a porous three-dimensional network structure which is made of thermoplastic resin or thermosetting resin and has communication property, wherein the porous three-dimensional network structure has an average pore diameter of from 100 to 1000 μm and apparent density of from 0.01 to 0.5 g/cm³.

The invention relates to a method for preparation of low apparent density sheet silver powder, which comprises five steps: choosing materials, ball grinding, one- time surface modified, drying, and secondary surface modified. With the silver powder of silver content more than 99.95% and granularity among 0.1- 1um as the material, by wet ball grinding with the existence of mill medium, mill auxiliary agent and liquid lubricant, one- time chemical modification treatment, and one- time dry ball grinding modification treatment, the low apparent density sheet silver powder is prepared. The time of wet ball grinding being among 2- 8h that is 1/5 of the time of mechanical ball grinding and the apparent density being only 1/2 of that of mechanical ball grinding, with the invented, it solves the problem of deposition and agglomeration in conductive paint; and with twice surface modified treatment, coating two- layer protective film, the first layer being dispersion film and the second being directional floating film, the dispersibility and flotation property of the silver powder are improved, and the silver powder is the required material of producing electromagnetic shielding paint and conductive paint. Every index of the silver powder can satisfy the requirement of conductive paint and shielding pain.

A thin and uniform nonwoven fabric air filter for an internal combustion engine with a pleated form which comprises an air-laid nonwoven fabric obtained by forming a plurality of layers mainly composed of polyester-based binder fibers having a fiber length of 1 to 10 mm by an air-laid nonwoven fabric production process and performing heat adhesion, wherein an upper layer side (fluid inflow side) comprises large fibers, a lower layer side (fluid outflow side) comprises fine fibers, a final fluid outflow side comprises 100% of the polyester-based binder fibers, the basis weight (METSUKE) is from 100 to 350 g/m², the apparent density is from 0.04 g/cm³ to 0.3 g/cm³, and the dry-heat shrinkage factor after 300 hours at 100° C. is 3% or less. The air filter induces no environmental pollution, is high in dust collection efficiency, and has long life.

A process for forming a strong, low-density proppant, which process includes heating pumice particulates, or shaped agglomerates thereof, so as to form heat-treated pumice particulates, or heat-treated, shaped pumice agglomerates, having an apparent density of 2.4 or less and a crush resistance of no more than 10% fines at 4000 psi. Proppants, and well treatment fluids comprising proppants, meeting these characteristics and processes for treating subterranean formations using fluids which include such proppants are also described.

A pressed anode formed from an electrically conductive powder that contains a plurality of coarse agglomerates and fine agglomerates is provided. The fine agglomerates have an average size smaller than that of the coarse agglomerates so that the resulting powder contains two or more distinct particle sizes, i.e., a “bimodal” distribution. In this manner, the fine agglomerates can effectively occupy the pores defined between adjacent coarse agglomerates (“inter-agglomerate pores”). Through the occupation of the empty pores, the fine agglomerates can increase the apparent density of the resulting powder, which improves volumetric efficiency.

The invention provides a preparation method of large-mixing-amount fly ash non-autoclaved ultra-light foamed concrete. The preparation method comprises the steps of preparing the following raw materials in percentage by weight: 25-35% of cement, 25-47% of fly ash, 0-5% of silica fume, 0-2% of attapulgite clay, 1-5% of a chemical foaming agent, 0.03-2% of a foam stabilizer, 0-4% of fibers, 0.5-3% of a waterproof agent, 0-2% of a reinforcing agent, 0-4% of an accelerator, 0.1-0.4% of a water reducing agent, 0.1-4% of an expansion agent, 0-3% of quicklime and 22-30% of water, and then mixing, stirring and foaming the raw materials. The main properties of the foamed concrete prepared by the preparation method are superior to those of commonly used foamed concrete, the apparent density of the foamed concrete is 160-280kg/m<3>, the thermal conductivity is lower than 0.06W/(m.K), and the specific absorption of volume is not more than 10%; besides, the ratio of fly ash doped in the foamed concrete reaches 47%, the preparation method is good in process stability and high in finished product ratio, and the foamed concrete is suitable for large-scale production and can be used for outer wall external insulation works, roof insulation works, floor heating engineering, energy-saving composite materials and the like.

To prepare a shaped product comprising a thermal adhesive fiber under moisture and having a fiber aggregate nonwoven structure. In the shaped product, the thermal adhesive fibers under moisture are melted to bond to fibers constituting the fiber aggregate nonwoven structure and the bonded fiber ratio is not more than 85%. The shaped product has an apparent density of 0.05 to 0.7 g/cm³, a maximum bending stress of not less than 0.05 MPa in at least one direction, and a bending stress of not less than ⅕ of the maximum bending stress at 1.5 times as large as the bending deflection at the maximum bending stress. The moistenable-thermal adhesive fiber may be a sheath-core form conjugated fiber comprising a sheath part comprising an ethylene-vinyl alcohol-series copolymer and a core part comprising a polyester-series resin. Such a shaped product can be used for a building board or the like since the shaped product has a high bending stress although the product is light and has a low density.

A gas accumulator for storing pressurized gases, in particular gaseous fuels such as hydrogen or the like, which gas accumulator has a sealed vessel which is provided with a valve-actuated feed line and outlet line for the pressurized gas and with a solid packing of carbon nanostructures. To increase the storage capacity of a gas accumulator of this type significantly, the particles of the carbon nanostructures are compacted to form larger coherent conglomerates having an apparent density which is increased in comparison with the apparent density of the originally loose particles. The compaction can be carried out, for example, by ordering the carbon nanostructures in their orientation to one another, or else by forming the conglomerates by pressing non-ordered carbon nanostructures. In each case, minimizing the interstices between the individual carbon nanostructures means that the amount of the carbon nanostructures which can be introduced into the vessel and thus the amount of the pressurized gas which can be stored in these can be increased.

The invention discloses an ambient pressure drying method for rapidly preparing SiO2 aerogel. Part of an alcohol solvent is replaced with a solvent with low surface tension; silica-alkoxides, the non-replaced alcohol solvent, an acidic catalyst, a basic catalyst and the solvent with the low surface tension are prepared into sol according to a certain proportion, after alcogel containing the solvent with the low surface tension is formed, ageing and surface modification processes are carried out, and then, ambient pressure drying is directly carried out, so that the complex solvent exchanging step is omitted, and the SiO2 aerogel is prepared within 30h. By using the method, not only are the defects such as high equipment investment, low efficiency, high cost of the traditional supercritical drying process overcome, but also the problems of long period, high using cost for solvent exchanging and the like in the traditional ambient pressure drying process are solved, and the prepared SiO2 aerogel has the characteristics of low surface density, large specific area, large pore volume and the like.

A method of manufacturing a silica powder using a sol-gel technique, wherein a suspension consisting of synthetic silica soot, having a specific surface area of less than 80 m2/g, is made in water to form a concentration of 50% to 75% by weight of silica; the suspension is gelled; the resulting gel is dried without forming a crust and with microwaves and broken up into silica grains having an apparent density of 0.5 g/cm3 to 0.6 g/cm3; and screening of the dry gel is performed to provide grains having a desired size.

The invention provides a clean-water-carrying petroleum proppant for petroleum production of a low-permeability petroleum reservoir. The proppant is prepared through coating macromolecular polymer particles with the particle sizes of 3-100 meshes by using macromolecular resin, wherein the macromolecular polymer particles are white polymer balls formed through polymerizing olefin monomers or polymer microspheres formed through compounding after a silane coupling agent modified mineral material is added; and the proppant has the volume density of 0.5-1.0 g/cm<3> and the apparent density of 1.1-1.5 g/cm<3>. The invention simultaneously provides a preparation method of the petroleum proppant. The clean-water-carrying petroleum proppant prepared by adopting the preparation method can greatly reduce the viscosity of sand carrying liquid, reduce the damage to strata and pumps and even realize clean fracturing. Through the low-density proppant, the entire construction cost can be reduced, and the phenomenon of proppant discharging or crack emptying is difficult to occur.

The present invention discloses a method for adopting the limonite and the siderite to produce iron powder and a reduction roaster. The material adopts the limonite and the siderite or the specularite, the hematite, and the sulphuric acid slag, the inclined rotary reduction roaster is used, the pressure of the furnace chamber is 250 to 350 Pa, under the deoxidizing atmosphere, the inert solid is rotated and moved to 650 to 900 DEG C from the low temperature, and is cooled and magnetized, and lastly become the iron powder through the dressing by magnetic separation. The present invention is adopted to produce the iron powder, the resources is rich and the production cost is low, and through the utilization of the powder metallurgy art, the iron content of the iron powder is controlled and the activation energy of the iron powder is reduced, and the chemical reaction ability is increased, thereby the output of iron powder is high, the quality is good, the iron powder is loose and porous, the specific surface is big, the apparent density is large, the manufacture cost of pellets sinter and steel smelting can be reduced greatly, and the iron powder can use directly to produce iron oxide red as well as H and N synthetic iron catalyst, or produce ultrapure iron powder.