379results about How to "Adjustable density" patented technology

The invention discloses graphene aerogel and a preparation method thereof. The method comprises the following steps: (1) uniformly mixing graphene oxide dispersion liquid with an amine water-soluble compound to obtain graphene oxide mixed liquid, wherein the amine water-soluble compound is selected from one or more of diethylamine, ethidene diamine, propane diamine, butane diamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, allylamine polymer and N,N'-bis(2-aminoethyl)-1,3-propane diamine; (2) irradiating the graphene oxide mixed liquid by high-energy rays under the anaerobic condition to obtain amino-modified graphene aerogel; (3) performing freeze-drying or supercritical CO2 drying to obtain the graphene aerogel. The graphene aerogel adopts a porous and macroporous structure, is relatively uniform in structure, and can be used for adsorbing an organic solvent; moreover, the preparation method is simple and environment-friendly.

The invention offers high density fracturing fluid formula used inorganic salt to improve water-base fracturing fluid density. Its feature is that its weight ratio is as follows: weight additive 4-50%, vegetable gum thickener 0.3-1.0%, cross linking agent 0.1-2.0%, pH value regulator 0.5-1.0%, cracking agent 0.002-0.3%, cleanup additive 0.05-0.5%, fungicide 0.03-0.2%, and water 30-73%. The density of the high density fracturing fluid is adjustable and can exceed 1.51g/cm3. It has good high temperature resistant, shearing resistant, and so on. Thus it can supply reliable assurance for abnormal high pressure and ultra-deep well exploration test oil and exploitation.

The invention provides a novel gas flow standard device and an application method thereof. The gas flow standard device mainly comprises a standard flow meter set, a test stand for a to-be-tested flow meter, a signal acquisition and control system, a gas circulation power system and a high-pressure gas source, wherein the standard flow meter set, the to-be-tested flow meter and the gas circulation power system are communicated in sequence through a pipeline to construct an enclosed loop; the signal acquisition and control system is provided with a temperature measuring unit and a pressure measuring unit respectively at pipeline sections where the standard flow meter set and the to-be-tested flow meter are positioned, and is used for controlling each flow regulating valve in a high-pressure fan, a heat exchanger and the enclosed loop. The gas flow standard device has the advantages of small floor area, stable and adjustable gas detection pressure, low running noise and low running energy consumption.

An environment-friendly high-density solid-free weighting agent comprises components in parts by weight as follows: 0.02-0.05 parts of a dispersant, 0.3-1 part of a tackifier, 0.5-1.2 parts of chelating agent, 0.6-2 parts of a corrosion inhibitor and the balance of soluble weighting materials, wherein the dispersant is one or two of sodium polyacrylate and copolymer of phosphono and carboxylic acid; the tackifier is one or more of chitosan, agar, polyacrylamide, xanthan gum and hydroxypropyl methyl cellulose; the chelating agent is one or two of aminophosphonic acid chelate resin and ethylenediamine tetraacetic acid disodium; the corrosion inhibitor is one or two of multiple polycarboxylate and sodium gluconate; the soluble weighting materials are one or more of potassium formate, potassium citrate, potassium acetate, potassium silicate and potassium sulfate. The process steps are as follows: the raw materials are taken in weight proportion, mixed and uniformly stirred; the raw materials are added to water and dissolved at the high temperature of 70-80 DEG C; a product is evaporated to dryness, and solid is obtained; the obtained solid is ground into powder, and the solid weighting agent is obtained.

The invention belongs to the field of high-flame-retardant rigid polyurethane foam insulation materials, which particularly relates to a halogen-free non-phosphorus high-flame-retardant rigid polyurethane foam insulation material and a preparation method thereof. The method comprises the following steps: mechanically stirring a mixture formed by polyether (or polyester) polyhydric alcohols, a catalyst, a silicone oil, a silane coupling agent, a foaming agent, expansible graphite and inorganic fillers (one or more than one material selected from magnesium hydrate, kaolin, aluminium hydroxide and calcium carbonate) in certain proportion and evenly mixing; then, fully mixing the mixture with polyisocyanates; pouring into a mould of 50 DEG C to 100 DEG C; closing a mould cover; and finally, foaming and curing, thereby obtaining the halogen-free non-phosphorus high-flame-retardant rigid polyurethane foam insulation material. The flame retardation of the insulation material is improved under the synergistic effect of the expansible graphite and the inorganic fillers, so that the limit oxygen index of the insulation material can reach 90; and the vertical combustion performance of the insulation material can reach the level UL94 V0. According to the insulation material provided by the invention, the defect of a flame retardant containing halogen and phosphorus is overcome; and the flame retardation of the insulation material is improved under the synergistic effect of the environment-friendly fillers. Thus, the application requirement of the insulation material in practical engineering can be satisfied.

The invention provides a thermoplastic polyurethane composite foamed material and a preparation method thereof. The thermoplastic polyurethane composite foamed material is prepared from 10-25 parts of polyurethane, 35-45 parts of ethylene-vinyl acetate copolymers, 15-30 parts of polyolefin elastomers, 6-10 parts of polyethylene, 6-18 parts of ethylene propylene diene monomers, 6-15 parts of polybutadiene polymers, 3-5 parts of filler, 1.5-2.2 parts of zinc oxide, 0.4-0.6 parts of stearic acid, 0.8-1.4 parts of zinc stearate, 0.1-0.4 parts of a cross-linking agent, 0.7-1.0 part of a bridging agent and 2.5-3.5 parts of a foaming agent. The thermoplastic polyurethane composite foamed material is high in rebound resilience, resistant to compression and good in tear resistance. The preparation method of the thermoplastic polyurethane composite foamed material comprises steps as follows: 1) components except zinc oxide, the cross-linking agent, the bridging agent and the foaming agent are weighed; 2) all the components weighed in the step 1) are mixed; 3) the rest components are weighed; 4) the components weighed in the step 3) are added to a material obtained after mixing in the step 2) for mixing; 5) granulation is performed; 6) foaming is performed.

The invention discloses a leaking stoppage reinforcing agent comprising the following components in parts by weight: 20-30 parts of sodium silicate, 20-30 parts of phenolic resin, 30-50 parts of calcium carbonate, 1-5 parts of potassium silicate, 1-5 parts of sodium sulfite, 0.5-3 parts of polyacrylamide (PAM), 0.5-3 parts of sodium carboxymethylcellulose CMC-LV and 0.5-3 parts of hydroxyethyl cellulose (HEC). According to a conventional preparation method, the materials are added into a kneading machine in sequence in parts by weight at normal temperature and under normal pressure and then are uniformly mixed and stirred, and then the mixture is crushed into granular products, of which the particle size is 0.01mm-0.3mm, after being dried. The leaking stoppage reinforcing agent disclosed by the invention has the characteristics of easily available raw materials, scientific and simple process, safe construction, capability of reinforcing the wall of a leakage stratum well, capability of being added into different types of leaking stoppage slurry when being used together with other materials for reinforcement, capability of improving the reinforcing performance of leaking stoppage slurry and the like, and is widely applied to petroleum and geological drilling engineering.

The invention discloses a carbon fiber reinforced metal ceramic base composite material. The carbon fiber reinforced metal ceramic base composite material consists of a carbon fiber prefabricated body, an interface layer, a ceramic basal body and a metal basal body; metal is one of an aluminum alloy, a magnesium alloy, a copper alloy and a tin alloy; ceramic is SiC; the density of the composite material is 1.8-3.8 g/cm3; and the invention further discloses a method for preparing different alloy ceramic composite materials. The composite material has the advantages of short preparation period and adjustable density, overcomes the brittleness and low density of the ceramic, and can meet the demands on the ceramic base composite materials in multiple fields.

A bit error rate tester and a pseudo random bit sequences (PRBS) generator thereof are provided. The bit error rate tester includes a transmitter PRBS generator, a master PRBS generator, a slave PRBS generator, a comparator, and a counting unit. The transmitter PRBS generator generates a parallel N-bit (N is an integer larger than 1) original PRBS, wherein an object to be tested receives the original PRBS and outputs a parallel N-bit code to be tested. The master and the slave PRBS generators generate a master and a slave parallel N-bit PRBS, respectively. The comparator receives, compares, and determines whether the code to be tested, the master and the slave PRBS are the same or not, and outputs a comparison result. The counting unit coupling to the comparator counts a number of bit errors based on the comparison result.

The invention provides high temperature resistant well cementation cement paste used for a steam injection thermal production well, and the cement paste comprises the following components by weight: 100 parts of high temperature resistant cement, 30-40 parts of a high temperature stabilizer, 0.5-1.2 parts of a thickening time control agent, 2.5-4.5 parts of an oilwell cement fluid loss agent, 0.02-0.15 part of an anti sedimentation agent, 0.02-0.15 part of a defoaming agent, and 45-100 parts of water. The high temperature resistant well cementation cement paste can effectively solve the problems of quick reduction in strength, fast rising in permeability and the like of well cementation cement paste systems in the prior art, can improve the thermal stability, reduces the possibility of channeling and casing damage, can make oilwells long-term sealed, improves production efficiency, and reduces production cost.

The invention relates to a preparation method of a silicon dioxide aerogel composite material. The preparation method of the silicon dioxide aerogel composite material comprises the following steps: (1) carrying out hydrolysis-polycondensation reaction on a fluorine-containing silane coupling reagent under the acidic catalysis condition, and constructing temperature-resistant hydrophobic layer structures on the surfaces of sol particles; (2) dipping the obtained silicon dioxide sol in a fiber-reinforced body under the catalysis condition, and carrying out sol-gel, aging, solvent replacement and drying to obtain a hydrophobic fiber-reinforced aerogel composite material; (3) removing unstable residual active groups and water on the surface of the aerogel composite material at a high temperature to realize surface activation; (4) further carrying out hydrophobic treatment by using a fluorine-containing silane hydrophobization reagent; and (5) drying the fiber-reinforced aerogel compositematerial after the fiber-reinforced aerogel composite material is subjected to hydrophobic treatment. The prepared aerogel composite material can be recycled at a high temperature and a low temperature, is excellent in heat-insulation effect and has moisture resistance.