374results about How to "Suitable for a wide temperature range" patented technology

The invention provides a nonaqueous electrolyte material, which consists of fluorosulfonylimide lithium and organic solvent with dielectric constant less than 30, and the organic solvent is selected from one or more of chain-like carbonate solvent, phosphate solvent, siloxane solvent, boroxane solvent, acetate solvent, propionate solvent, butyrate solvent, CF3OCH2CH2OCF3 solvent, C2H5OCH2CH2OCH3 solvent, C2F5OCH2CH2OCF3 solvent, 1,3-dioxolane solvent and aliphatic nitrile solvent with more than two carbon atoms. The ionic conductivity of the nonaqueous electrolyte material is 0.01mS / cm to 18mS / cm, the lithium ion transference number is tLi plus equal to 0.2 to 0.8, and the applicable temperature range is 80DEG C below zero to 60DEG C below zero. The invention also provides an application of the nonaqueous electrolyte material in the preparation of lithium batteries and super capacitors. Furthermore, the invention provides a lithium battery and a super capacitor which contain the nonaqueous electrolyte material of fluorosulfonylimide lithium.

The invention discloses a wet dual-clutch automatic transmission and a precharging pressure control method thereof. The control method includes the steps: 1, performing oil precharging on duel wet clutches; 2, acquiring clutch torque transmission combination point pressure P0 and oil precharging pressure P1 according to acquired transmission oil temperature; 3, acquiring actual expected oil charging pressure P4 according to the formula that P4=P0+P1; 4, loading electromagnetic valve current corresponding to the P4 to an electromagnetic valve of the clutches according to the actual expected oil charging pressure P4; 5, measuring actual pressure P of the clutches, judging difference between the actual pressure P of the clutches and the clutch torque transmission combination point pressure P0 is within a preset error range or not, if so, executing a step 6, and otherwise, subtracting a fixed pressure value delta P from the actual expected oil charging pressure P4, and then executing the step 4; and 6, finishing oil charging. During oil precharging of the clutches, oil can be charged into a hydraulic oil chamber of each clutch quickly, oil pressure is established, conditions for torque transmission are satisfied, and response is rapid.

The invention discloses a method for preparing nano-rod cellulose, which comprises the following steps: dispersing fiber raw material into sulphuric acid water solution of which mass concentration is 50 to 65 percent, hydrolyzing the fiber raw material by single-mode microwave radiation for 5 to 60 minutes at a temperature of between 20 and 50 DEG C and at the microwave radiation power of 10 to 100 watts, then adding distilled water into hydrolysis solution and diluting the hydrolysis solution to have 10 times of volume, and obtaining stable nano-rod cellulose suspension through post treatment processes such as centrifugal separation, dialysis, filter, ultrasonic dispersion and the like of the diluent, so as to obtain the nano-rod cellulose of which width is about 10 nanometers and length is about 200 to 300 nanometers.

The present invention discloses high temperature chain oil, the components and the contents are: high temperature antioxygen 1 to 5 percent, extreme pressure / anti-wear agent 1 to 10 percent, corrosion inhibitor 0.01 to 0.5 percent, and high temperature detergent dispersant 1 to 20 percent, the rest is base oil; the components and the contents of the base oil (weight ratio) are: dipentaerythritol ester 50 to 90 percent, and aromatic ester 10 to 50 percent. The preparation is as follows: the dipentaerythritol ester and the aromatic ester are mixed together according to the above ratio to prepare the base oil, a certain volume of the high temperature antioxygen, the extreme pressure anti-wear agent, the high temperature detergent dispersant and the corrosion inhibitor is added into the base oil, then the base oil is heated to 80 to 100 DEG C, and is agitated at the constant temperature for 0.5 to 1 hour, and is filtrated, thus the product is got. The present invention is characterized in that the coking volume can be obviously reduced, the anti-high temperature coking performance and the high temperature detergency performance can be improved, the product can be used under the 280 DEG C high temperature condition, the evaporation loss is little, and the coking volume is little, the lubrication performance and the high temperature detergency and dispersing performance is good.

The invention relates to a retarder for cement paste used in petroleum drilling, completion or well cementing operation, which comprises two components. The two components are a multipolymer containing carboxylic acid groups accounting for 60 to 90 portions by weight and an organic phosphonic acid and salts thereof accounting for 10 to 40 portions by weight. The average relative molecular mass of the multipolymer containing carboxylic acid groups is 2,000 to 20,000. The applicable temperature scope of the cement retarder is wide, and the cement retarder can be applied at high temperature, medium and low temperatures. The applicable temperature scope ranges from 30 DEG C to 230 DEG C. The cement retarder can be matched with various additives and is very compatible, which is applicable for oil well cement of various grades. The retarder can resist salt well, which is applicable for fresh water, brine, seawater, concentrated water and so on. The retarder can be widely applied in various shallow holes, moderate-depth holes, deep holes and superdeep holes. An excess amount of retarder is not sensitive in brine and seawater; the construction safety is ensured; the retarder does not adversely affect the strength development of cement.

The invention discloses a agglomerating inhibiting agent, preparing method and application thereof. The agglomerating inhibiting agent is selected from one or more hydrogenizating upgrading products of hydrocarbon mixture of coal oil, ethylene tar oil, catalytic crackingre cycle stock, catalytic crackingre slurry oil, catalytic crackingre heavy oil, catalytic crackingre extract oil and coking hydrowax, which contain 65-100 wt% of cyclane and arene, boilingpoint is 150 DEG C to 500 DEG C. The agglomerating inhibiting agent is used for preventing, slowing and removing agglomerating of apparatus and pipilines in process of petroleum refining and petrochemical processing.

The invention discloses a hub bearing lubricating grease and a preparation method thereof. In the lubricating grease, composite lithium soap is taken as a thickening agent, an antirusting agent, an antioxidant, an extreme-pressure anti-wear agent and a waterproofing agent are added, and a nanometer additive and the like are added according to different proportions. The lubricating grease is prepared by the processes including saponifying, dehydrating, blending, shearing, homogenizing, grinding, filtering, degassing and the like. A lubricating grease composition has the advantages of high dropping point, high wear resistance, high extreme pressure resistance, high high-low temperature performance and the like, has high water resistance and rust resistance, and is suitable for lubricating the automobile bush bearings under harsh working conditions.

The invention discloses a copper-based composite catalyst for gas-state zero valent mercury oxidation in the field of smoke control and a preparation method and the purpose thereof. The copper-based catalyst is a copper-based composite oxide catalyst and / or a copper-based composite halide catalyst. The catalyst can utilize oxygen and trace HCI existing in smoke to achieve high efficiency conversion of zero valent mercury (HgO) and divalent mercury (Hg2+) under low temperature in a wider temperature range (500-300 DEG C) and can even achieve high efficiency oxidation of simple substance mercury in smoke free of HCI. The catalyst is suitable for catalytic oxidation of mercury in fire coal smoke, and the product Hg2+ of oxidation can be easily dissolved in water and can be removed by other pollutant control devices. The catalyst is simple in preparation method, wide in suitable temperature range, high in oxidation efficiency, weak in dependency on CI in the smoke, good in stability and high in SO2 poisoning resistance and has good application prospects and economical benefits in the fire coal smoke mercury discharge control fields including power station boilers, industrial boilers, industrial kilns and the like.

The invention provides a high-energy lead-acid storage battery cathode plate diachylon and a preparation method thereof. The diachylon comprises lead powder, pure water, analytical pure sulfuric acid and an auxiliary material, wherein the lead powder comprises 65-70 percent of lead oxide, the density of the analytical pure sulfuric acid is 1.400g / cm<3>, and the pure water has the conductivity of smaller than 0.3 mus / cm; and the auxiliary material comprises the following components based on the weight proportion of the lead powder: 0.8-1 percent of nano barium sulphate, 0.1-0.3 percent of modified sodium lignosulphonate, 0.1-0.3 percent of tannin, 0.08-0.1 percent of polyester short fiber, 0.2-0.3 percent of carbon black and 0.3-1 percent of poly-alpha-olefin base oil. When diachylon is mixed, 10-15kg of water, 8-12kg of analytical pure sulfuric acid and the auxiliary material based on the weight proportion of the lead powder are added into 100kg of lead powder. The invention provides the high-energy lead-acid storage battery cathode plate diachylon and the preparation method thereof.

The invention provides a superhydrophobic coating spray for material and facility surface protection and preparation and use methods thereof. The superhydrophobic coating spray is low-viscosity liquid, and is prepared from nanometer structure and micrometer structure particles and hydrophobic substances through a chemical reaction; a layer of superhydrophobic film can be formed on the surface of a base material to be protected through a spray coating process; the film has a micrometer-nanometer composite dual structure similar to the surface of a lotus leaf; the contact angle with water is not smaller than 150 degrees; the rolling angle is smaller than 10 degrees; good hydrophobic performance is realized. The superhydrophobic coating spray provided by the invention has the advantages that the cost is low; the materials and the process achieve the environment-friendly effects; the manufacturing and the spray coating processes are simple and convenient; the limitation by the base material or the facility shape is avoided; the industrialization can be easily realized; the protection effect durability is good. The superhydrophobic coating spray can be widely applied to the hydrophobic protection of the material base material surfaces of concrete, metal, glass and the like, so that the excellent hydrophobic effect can be shown on the surface of the base material; meanwhile, the functions of self-cleaning pollution resistance, the anti-corrosion function, the ice and frost condensing inhibiting function and the like can also be realized.

The invention belongs to the technical field of batteries, and particularly relates to a composite solid-state electrolyte which comprises an organic polymer, a lithium salt, an ionic liquid and an inorganic solid electrolyte material, wherein the mass ratio of the polymer to the lithium salt to the ionic liquid to the inorganic solid electrolyte material is 1: (0.1-0.6): (0.1-1): (0.05-0.2). Thecomposite solid-state electrolyte disclosed by the invention is high in ionic conductivity, high in stability, good in compatibility with positive and negative electrodes and excellent in mechanical property, and the composite solid-state electrolyte has excellent mechanical property due to a polymer framework; the lithium salt provides lithium ions for the solid electrolyte; the ionic liquid improves the conductivity of the electrolyte; the inorganic solid electrolyte material can be crosslinked with the polymer to further improve the mechanical properties of the solid electrolyte and increase the strength.

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 discloses a preparation method of an organic and inorganic composite flushing liquid, and belongs to the technique of oil well cement well cementation. The flushing liquid comprises the following components: polysorbate-80, alkyl phenol polyethylene glycol ether, dodecyl benzene sulfonic acid sodium, sodium silicate, sodium pyrophosphate and water, wherein the mass ratio of each component is as follows: 20%-30% of polysorbate-80, 10%-15% of alkyl phenol polyethylene glycol ether, 5%-10% of dodecyl benzene sulfonic acid sodium, 10%-20% of sodium silicate, 5%-10% of sodium pyrophosphate and the balance of water. The flushing liquid is suitable for both the oil-based mud and water-based mud, has high flushing efficiency, improves the replacement efficiency of a well drilling liquid and cement sheath interfacial cementation quality, and can be used under the condition of 50 DEG C-200 DEG C.

The invention relates to a degreaser used for degreasing blue leather. The degreaser is a washing composite mainly using surfactant as base material and is clear and transparent microemulsion. The formula of the degreaser comprises the following components by weight percent: 20-60% of surfactant (one or two of non-ionic surfactants such as fatty alcohol polyoxyethylene ether, fatty alcohol polyoxypropylene ether and alkanolamide, 10-40% of solvent (one or two of toluene, xylene, turpentine, C8-C12 of solvent oil, trichloroethylene, tetrachloroethylene and solvent kerosene), 0-5% of cosolvent ( one or two of ethanol, n-propanol, isopropanol and ethylene glycol monobutyl ether, 0-10% of acidic lipase, 0-2% of defoaming agent and 40-60% of water. The application temperature of the microemulsion degreaser is wide, and can be stored for long time without layering and have stable state; and the degreaser has the advantages of solvent degreasing and emulsion degreasing, the fat dissolving and cleaning functions of organic solvents and the cleaning characteristics of water-based surfactants. Therefore, the natural fat in blue leather can be reduced to less than 1%.

The present invention relates to a method to improve the water-absorption speed of rubber which swells in water by means of fiber. The present invention is characterized in the following steps: 1) short fiber, solvent and rubber with the mass ratio of 5 to 40:50 to 100:10 to 100 are added into a container, which are constantly stirred until the materials are evenly dispersed; then the mixture is spilled out from the container and is dried in vacuum at the temperature of 80 DEG C to get mixture A; 2) rubber, mixture A, absorbent resin, plasticizer, stearic acid, zinc oxide, curing agent, antioxidant, reinforcing agent and accelerator are mixed together with the quality ratio of 50:50:10 to 60:0 to 15:0.5 to 3:2 to 6:0.5 to 5:0 to 3:30 to 60:0.5 to 3 ratio to generate mixture B; 3) mixture B is placed evenly on the twin-roll open mill to get rubber which swells in water within the temperate range between 25 DEG C to 150 DEG C. The method can enhance the water-absorption speed of the rubber which swells in water, and can maintain the mechanical properties of the rubber.

The invention discloses a color RGB (red, green and blue)-component-based urine analysis device, which is characterized by comprising a processor, a serial communication unit, a temperature measuring unit, a light intensity control unit and a color sensor unit, wherein the processor controls the light intensity of a white LED (light-emitting diode) lamp through the light intensity control unit, light emitted from the white LED lamp shines on a urinalysis test strip on a sampling platform, a color RGB component of reflected light of each reagent area of the urinalysis test strip is acquired by using the color sensor unit, and the processor determines a semi-quantitative value of a corresponding detection index of each reagent area according to the color RGB components and temperatures. The device and the method disclosed by the invention have the remarkable effects that the circuit structure is simple, and the cost is low; through the coordination of the color sensor unit and the temperature detection unit, a calculation coefficient of each detection index is fitted by using an experience numerical value of the existing precision instrument, so that a microprocessor can calculate an accurate measurement index by using the coefficients; the device is high in equipment precision and wide in temperature application range.

The invention discloses a positive-negative-mixed liquid crystal composition. The positive-negative-mixed liquid crystal composition is characterized by comprising a component A composed of at least one kind of negative compounds shown in the first general formula (please see the specification for the first general formula) and a component B composed of one or more kinds of positive compounds shown in the second general formula (please see the specification for the second general formula). The liquid crystal composition has the advantages of being positively dielectric, high in charge retention rate, low in rotary viscosity, short in response time and particularly high in transmittance; the positive-negative-mixed liquid crystal composition is suitable for manufacturing a high-transmittance and rapid-responding TFT-LCD.

The invention provides low-temperature lubricating grease and a preparation method thereof. The low-temperature lubricating grease comprises mineral oil, synthesized oil, fatty acid soap, an antioxidant and an antirust agent. Compared with the prior art, the low-temperature lubricating grease is characterized in that semi-synthesized oil obtained by mixing III-type oil and ester oil and / or PAO (poly alpha olefin) oil is used as basic oil; the III-type oil has a high viscosity index and is high in high-temperature and low-temperature performance, oxidation stability, heat stability and evaporation performance; the ester oil and the PAO oil also have high viscosity indexes and are high in low-temperature performance; moreover, a mixture of lithium stearate and 12-hydroxy lithium stearate is used as a thickening agent for thickening the semi-synthesized oil, so that the low-temperature lubricating grease is high in low-temperature performance, and a used component can be normally lubricated under low temperature; the applicable temperature range is large; furthermore, the thickening agent is easy to synthesize.

The invention discloses a dicyclopentadiene (DCPD) and carbon fiber cloth composite manhole cover and a manufacturing method thereof. According to the manufacturing method, a component A and a component B are adopted, are mixed through an injection machine mixing head according to the weight ratio of 1:1 and then are injected into a manhole cover mold pre-placed and fixed with carbon fiber cloth subjected to surface treatment, polymerization reaction and molding processes are preformed in the manhole cover mold, and thus the polydicyclopentadiene and carbon fiber cloth composite manhole cover is obtained; the component A comprises dicyclopentadiene and a main catalyst; the component B comprises dicyclopentadiene and an activating agent. With adopting of the reaction injection molding processing method, the processing process adopts one-time molding, the processing flow is greatly reduced, and the processing speed is improved; with adopting of dicyclopentadiene and the carbon fiber cloth as the materials, the manhole cover strength and rigidity are obviously improved, the manhole cover has the advantages of abrasion resistance, corrosion resistance, excellent rigidity, excellent impact strength, wide applicable temperature range and good heat resistance, and the service life is prolonged.

The invention discloses a thin felt with glass fiber for the substrate of plastic floor ant the manufacturing method, comprising short-cut silk of glass fiber, dispersant, surfactant and organic binder. Said short-cut silk of glass fiber is middle-alkali or non-alkali, the diameter is 9-10 mum and the length is 6-12mm. Said dispersant is thickener belonging to cellulose acetate. Said surfactant is quaternary ammonium cationic surfactants. The organic binder is the mixture of polyethylene acetate emulsion thermosetting resin, KH560 coupling agent and water. Said thin felt with glass fiber is produced by wet technology, which comprises producing stock, preparing slurry, sizing forming, dipping and drying so on. The product is provided with high compactness, even thickness, widely applied temperature, and no-deformation under high temperature. The plastic floor surface with the felt as the substrate, is provided with flat and smooth, no shrinkage deformation, no-bending, no mildewing and stable dimension.

The invention relates to a high temperature ductility well cementing carboxylic styrene butadiene latex additive. The additive consists of 1 portion of a liquid A, 0.067 to 0.133 portion of a liquid B and 0.067 to 0.133 portion of a liquid C. The liquid A comprises 1 portion of carboxylic styrene butadiene latex, 0.03 to 0.3 portion of sulfonate, 0.0 to 0.8 portion of phosphate, carboxylate or a mixture thereof, and 0.1 to 0.8 portion of an acrylamide-acrylic acid-alpha-acrylamide-2-methylpropanesulfonic acid copolymer; the liquid B contains two nonionic surfactants and deionized water; and the liquid C contains two anionic surfactants and the deionized water. When a well bottom temperature reaches between 190 and 240 DEG C, cement slurry is also characterized in low water loss, adjustable thickening time and high compressive strength; and the hardened cement formed by the cement slurry can ensure good well cementing quality with ductility.

The invention provides a method for preparing polyolefin with ultra-high molecular weight. The method is characterized by comprising steps as follows: step one, a solvent is added to a reactor; step two, inert gas is introduced into the solvent, and then the temperature of the reactor is adjusted to subzero 40 DEG C-100 DEG C; step three, a catalyst, a promoter and olefin monomers are added to thereactor in sequence; step four, the inert gas in the solvent is converted into nano-micro bubbles with diameter being 100 nm-1000 mu m, and a polymerization reaction is started; step five, after thereaction, polyolefin with weight-average molecular weight being 1,000,000-10,000,000 g / mol is obtained, and a ratio of initial storage modulus to platform storage modulus of polyolefin at 160 DEG C is0.05-0.70. Compared with the prior art, the competitive relation of chain crystallization and chain growth can be regulated and controlled in a nano-micro scale range, and formation of chain entanglement is inhibited; besides, the catalyst selectivity is wide, and the low entanglement characteristic of polyolefin can be guaranteed in a range of wider temperature.

The invention relates to an inorganic high-efficiency flat superconducting flat-plate solar collector and belongs to the field of flat-plate solar collectors. The inorganic high-efficiency flat superconducting flat-plate solar collector comprises a heat absorption plate core, a high-light transmittance toughened glass cover plate, a heat insulation layer, a copper pipe flow channel and an outer frame, wherein the heat insulation layer is arranged in the outer frame; the heat absorption plate core is arranged in the outer frame; a heat absorption surface of the heat absorption plate core is upward; a condensation end of an inorganic high-efficiency flat superconducting heat pipe is connected with the copper pipe flow channel; two sides of the copper pipe flow channel are provided with a water inlet and a water outlet; the high-light transmittance toughened glass cover plate covers above the heat absorption plate core; the lower surface of the heat absorption plate core is provided with the inorganic high-efficiency flat superconducting heat pipe; the inorganic high-efficiency flat superconducting heat pipe is fixedly adhered to the heat absorption plate core; and the condensation end of the inorganic high-efficiency flat superconducting heat pipe is connected with the copper pipe flow channel.

The high temperature water glass blocking agent for oil production contains water glass, cross-linking agent and water, and may have surfactant contained when some cross-linking agent is used. The blocking agent has wide application temperature range of 60-280 deg.c, and has the curing time of 5-8 hr at 100 deg.c, 3-5 hr at 200 deg.c and 2-3 hr at 250 deg.c. It has high post-curing strength, pressure strength of 0.2-0.5 MPa, excellent long term heat stability, and no obvious degradation in strength after curing and set at 200 deg.c for 2 months. It may be in-situ compounded simply and single-liquid injected, and has easy to control blocking effect. The blocking agent is suitable for use in avoiding blow-by in steam flooding and steam soaking oil wall.

The invention relates to an environment friendly type snow melt agent, which comprises sodium chloride serving as a main component and various additives of sodium citrate, sodium dihydrogen phosphate, sodium metasilicate, urea, sodium carboxymethyl cellulose and the like, and may also comprises abscisic acid or indolylacetic acid or mixture thereof, sodium tartrate and humic acid or salt thereof. The snow melt agent of the invention has a high snow melt capacity and a wide application temperature range, is particular suitable for the ambient temperature of no less than 15 DEG C below zero and economy and environmental protection, and can effectively reduce the corrosion on metalized products and a concrete structure and effectively improve the anti-sallification ability of seeds, plants and soil. The invention also provides a method for using the snow melt agent. In the method, the finished product of the snow melt agent is unnecessarily prepared in advance, instead the main component and various additives are separately placed, and the snow melt agent is prepared in a construction site before using; therefore, the method can avoid the problems that the snow melt agent is wetted and hardened during storage and transportation, and also overcome the defects of high temperature energy consumption and possibly caused decomposition of additives in a process of preparing composite particles(such as coating granulation). The snow melt agent is simple in operation and low in cost and particularly suitable for mechanized spraying operation.

The invention discloses a nylon film composite material for an outer film of a lithium-ion polymer battery, aiming at providing a nylon film composite material which is stable in thermal property, not easy to absorb moisture, puncture-resistant, high in dry-state and low-temperature impact strength, non-deformable in case of absorbing water, good in multi-layer coextrusion compounding compatibility, balanced in flow extension, and capable of realizing no breakage of a corner in case of an impact depth of 3-12 mm or more. The nylon film composite material disclosed by the invention is realized via the following technical scheme: 8-12 wt% of maleic anhydride (MAH), MAH-blended K resin and graft K-MAH grafted POE (polyolefin elastomer) blend material are contained in a nylon filling body; the nylon filling body takes maleic anhydride grafted polyethylene and ethylene propylene terpolymer rubber as interface compatibilizers; a maleic anhydride grafted elastomer carboxylic acid group is reacted with a polyamide end group or a polyamine group in a main chain to form a grafted copolymer; and epoxy resin siloxane hydrolysate is reacted with an amide group molecular-chain amino group to polymerize the composite material with a multi-element interwoven network. According to the composite material disclosed by the invention, the problem of the phenomenon that PA (polyamide) film heat seal is easy to fold, layer and break at a certain corner is solved.

The invention relates to a large-diameter underground pipeline non-excavation rehabilitation method. The method comprises the following steps: (1) collecting the internal information of a pipeline; (2) cleaning the inner wall of the pipeline; (3) detecting the interior of the pipeline; (4) performing leak repairing treatment of a damaged part in the pipeline, leveling the inner wall and cleaning the pipeline; (5) turning a lining, and feeding a CIPP lining hose into the pipeline with a turning equipment; (6) heating and curing the lining hose by using an unsaturated polyester solution as an adhesive; (7) performing forming cooling treatment of the pipeline after heating is finished; and (8) detecting and accepting the rehabilitated pipeline.

The invention discloses a denitration catalyst activity mother liquor preparation method, which comprises the following steps: dissolving ammonium metatungstate and ammonium metavanadate into oxalic acid solutions respectively; adding active TiO2 and SiO2 mixed powder into the oxalic acid solution which contains the ammonium metatungstate, mixing, then drying and calcining; adding obtained TiO2-SiO2 / WO3 mixed powder into the oxalic acid solution which contains the ammonium metavanadate, and mixing; finally adding binder to obtain denitration catalyst activity mother liquor. The invention further discloses an application of the denitration catalyst activity mother liquor. The denitration catalyst activity mother liquor is sprayed onto the inner side of a dedusting element; after drying and calcining are carried out, a dedusting unit provided with a denitration catalyst coating which contains TiO2-SiO2 / WO3 / V2O5 active matters is formed. By applying the preparation method disclosed by the invention, the stability of the active denitration catalyst mother liquor is high, the combinability of the active denitration catalyst on the dedusting element is high, and the active denitration catalyst can be widely applied to porous ceramic tube carriers for dedusting.

The utility model relates to a controllable expandable lost circulation additive for petroleum drilling and a production process thereof, and the controllable expandable lost circulation additive is used for the lost circulation resistance in the drilling process of petroleum exploration and development. The controllable expandable lost circulation additive is novel and mainly prepared from expandable resin A, temperature sensitive materials B and film forming materials C. The production process for the ontrollable expandable lost circulation additive for petroleum drilling comprises the following steps: mixing the temperature sensitive materials B with the film forming materials C through a pneumatic blender under the heating condition, heating a spray gun, an air pipe and a feed pipe until a set temperature is reached, supplying the materials to the spray gun through a peristaltic pump, atomizing coating solutions by utilizing the air pressure of an air compressor through the spray gun, and spraying the atomized coating solutions into a rotating coating pan filled with the expandable resin A to accomplish spray finishing. Compared with the existing lost circulation additive, the controllable expandable lost circulation additive has the advantages of extensive sources of raw materials, stable performance, longer shelf life, wide range of applicable temperature, nontoxicity, good effect of resisting lost circulation, and the like.

The invention relates to an oil well cement high temperature retarder applied to the technical field of oil field well drilling and completion. The invention is characterized in that: the retarder is composed of 1 part by weight of water, 0.005-0.030 part by weight of hydroxycarboxylic acid and salt thereof, 0.005-0.010 part by weight of cellulose derivative and 0.0001-0.0010 part by weight of sulfonate. The high temperature retarder has wide applicable temperature range, can be applied to cement paste systems with various densities, has strong compatibility with a plurality of admixture systems, and does not influence the performance of cement paste. The cement paste prepared by the retarder is stable, the thickening transition time is short, and the thickening time is adjustable; the hardened cement paste has rapidly developed compression strength and is suitable for the requirement of well cementation engineering.