362results about How to "Strong shear resistance" patented technology

The invention relates to a green flocculant- ammonium type cation starch flocculant with high replace degree. Said flocculant employs one of corn starch, wheat starch, tapioca starch, potato starch or any of mixture of them as raw material, takes 3-Chloro-2-hydroxypropyl-trimethylammonium Chloride, or epoxypropyl trimethyl ammonium chloride as cationic etherifying agent, and employs dry method to synthesize said flocculant by using sodium hydroxide and co-catalyst as complex catalyst system. The invention combines the advantage of dry method and semi-dry method, overcomes problem of agglomeration of starch during solution ejection, and solves problems of pasting and agglomeration of starch during reaction process when together with base. The invention is characterized by non post treatment, non three waste, simple processes, short reaction period, mild reaction condition, high efficiency and low cost. The flocculant is characterized when compared with normal ones by less consumption, fast settling speed, high transparency, and wide use for wastewater treatment and sludge waterless in industries such as paper making, dyeing, leathering making and petrochemical industry.

The invention discloses a polyamide and amine hybridized nanosilicon dioxide hyperbranched polymer and a preparation method thereof. The preparation method of the polymer comprises the following steps of firstly, modifying the surface of nanosilicon dioxide by using a coupling agent; then, carrying out Michael addition reaction and amidation reaction on the modified nanosilicon dioxide by using ethylenediamine and methyl acrylate; finally, carrying out functional modification by using allyl glycidyl ether to obtain a functional polyamide and amine hybridized nanosilicon dioxide monomer, and initiating polymerization reaction on the functional polyamide and amine hybridized nanosilicon dioxide monomer, acrylamide, acrylic acid and a heat-resistant and salt-tolerant monomer by using a redox initiator or azobis(isobutylamidine) initiator. The hyperbranched polymer has a network structure with a polyamide and amine hybridized nanosilicon dioxide unit as a center, has excellent shear resistance, strong thickening property, heat resistance and salt tolerance, and is wide in adaptability and capable of being used as an oil displacement agent for increasing the recovery rate of raw oil in an oil field environment with a high mineralization degree and a wide temperature range; the preparation method of the polyamide and amine hybridized nanosilicon dioxide hyperbranched polymer is reliable in principle, simple and convenient to operate and wide in application prospect.

The invention discloses a preparation method of a polyacrylamide emulsion. The preparation method comprises the following steps of adding acrylamide, one or more anion monomers, a grafting matrix, an aqueous stabilizer, a molecular weight conditioning agent and an initiator into water, adjusting a pH value to obtain a water phase, adding an emulsifier into a hydrocarbon solvent to obtain an oil phase, dropwisely adding the water phase into the oil phase, carrying out one-step emulsification or multistep emulsification to obtain an emulsion, carrying out displacement deoxygenation on the emulsion by inert gas, and adding the initiator into the emulsion for polymerization initiation to obtain a branched anion polyacrylamide water-in-oil anti-phase emulsion after polymerization is finished. The polyacrylamide emulsion obtained by the preparation method is used for the modern papermaking industry, avoids inorganic filler re-falling after retention, improves inorganic filler actual retention effects, avoids falling-off of dust and lint of a screen cloth, guarantees uniform and stable retention of an inorganic filler in a page, and properly reduces a bentonite use amount.

The invention relates to a base underground crosslinked thickening agent, in particular to a polyacrylamide thickening agent for further revamping of oilfield stimulation after alkaline/surfactant/polymer (ASP) flooding. The thickening agent is especially suitable for profile control and water shutoff of high-water-cut and strong basic oil reservoirs with vast surfactants. The base underground crosslinked thickening agent is synthesized by four monomers including acrylamide (AM), acrylic acid (AA), 2-acrylamide-2-methyl propane sulfonate (AMPS) and vinyl pyrrolidone (NVP) by aqueous solution copolymerization. The base underground crosslinked thickening agent has the characteristics of wide applicable scope (applicable to various water-base controlling, shutoff and flooding), quick dissolution in the presence of base and surfactants, high anti-shearing capability, environment friendliness, etc.

The invention discloses a tissue engineering cartilage and a preparation method thereof. The tissue engineering cartilage is cytoactive, consists of sequentially laminated cell patches including a surface layer, a middle layer, a deep layer and a calcified layer, and takes collagen matrix as a main component; the layers are compounded by collagen and hyaluronic acid, and the bordering integration of various layers of cartilage structures is promoted through hydrostatic culture; and the tissue engineering cartilage is prepared by preparing various layers of cartilage cell patches and assembling multiple structural layers. The prepared tissue engineering cartilage is in a layering arrangement of a natural cartilage, has a very good tissue structure and very good mechanical properties (frictional coefficient is 75-85 percent that of a natural cartilage tissue, and the elastic modulus is 80-90 percent that of the natural cartilage tissue.); the integration between different layers is good; experiments prove that the prepared tissue engineering cartilage can form the tidal line same as that of a normal cartilage tissue and has the same layering structure; and the prepared tissue engineering cartilage is capable of promoting regeneration and function recovery of a cartilage and obviously shortening the cycle of cartilage damage treatment and is applicable to cartilage defect restoration for a load-bearing part of a articular cartilage.

The invention discloses a holder adhesive for cellulose acetate cigarette tipping paper. The holder adhesive is prepared from 70-90% of a VAE emulsion and 10-30% of an additive, and the additive comprises polyvinyl alcohol, a plasticizer, a tackifier, an antifoaming agent and a bactericide. The holder adhesive has the characteristics of environmental protection, no boric acid, excellent wet viscosity, excellent in-machine stability, and realization of clean running of a machine.

The invention relates to a 4-neighborhood exclusive or image encryption method based on a hyper-chaos Lorenz system. The method is characterized in that RGE three components of an original color image are extracted, the grey levels of all pixel points in the RGE three components are recorded as a two-dimensional matrix PR, a two-dimensional matrix PG and a two-dimensional matrix PB, scrambling is carried out on the matrix PR, the matrix PG and the matrix PB respectively by means of chaos sequences generated by the hyper-chaos Lorenz to obtain an image pixel matrix PR1, an image pixel matrix PG1 and an image pixel matrix PB1 after scrambling, and 4-neighborhood exclusive or encryption is carried out on the matrix PR1 through reusing of the processed chaos sequences of the Lorenz, the matrix PG1 and the matrix PB1 respectively, so the encryption process is completed. The scrambling and 4-neighborhood exclusive or encryption are carried out on the color image through the hyper-chaos Lorenz system, so the method has the advantages of being large in secret key space, good in safety and strong in plaintext attack resistance and is suitable for image secret communication.

The invention discloses a water-soluble hyperbranched thick oil viscosity-reducing oil-displacing agent and a preparation method thereof. The viscosity reducing oil displacing agent is prepared by copolymerizing 0.01%-1.0% of a functionalized skeleton monomer, 10%-20% of acrylamide, 10%-20% of acrylic acid, 40%-50% of a nonionic functional monomer octylphenol polyoxyethylene ether and 20%-25% of an anionic monomer 2-acrylamidotetradecyl sodium sulfonate. The viscosity-reducing oil-displacing agent is relatively strong in water-phase tackifying capacity and good in anti-shearing performance, sothat the viscosity-reducing oil-displacing agent has the functions of controlling the fluidity ratio and expanding the swept volume; meanwhile, the viscosity-reducing oil-displacing agent has stronger mixed emulsifying property with thickened oil, the emulsifying viscosity-reducing rate of common thickened oil is more than 80%, the demulsification is easy, and the effects of reducing viscosity and displacing oil are realized. The raw materials for preparing the viscosity-reducing oil-displacing agent are wide in source, the preparation process is simple and convenient, and the cost is low.

The invention relates to a self-diverting agent for a heterogeneous carbonate rock acidizing system. The self-diverting agent is characterized by: taking erucic acid as an initiator, adding 3-dimethylaminopropylamine to make them undergo a reaction under oil bath conditions and under the action of a water carrying agent dimethylbenzene and a catalyst KOH; subjecting the reacted mixed solution to pressure reduced vacuum pumping and cooling, thus obtaining erucamide tertiary amine; mixing the erucamide tertiary amine with a sodium chloroacetate solution and leaving them to react under water bath conditions; dissolving the reacted mixed solution in an acetone solution, conducting cooling to room temperature, and carrying out standing and pumping filtration so as to obtain erucamidopropyl betaine, i.e. the self-diverting agent for the heterogeneous carbonate rock acidizing system involved in the invention. Along with the progression of an acid-rock reaction, the acid solution system prepared in the invention can realize automatic viscosity change to generate high flow resistance, thus realizing effective distribution of the acid solution in a reservoir. The self-diverting agent has the characteristics of reducing acid solution filter loss, increasing the acid solution penetration distance, and ensuring effective self-diverting of the acid solution system.

The invention relates to a gradient expansion device which is formed by expansion arm, cylinder, piston rod, axial pin, moving oil pipe, up-down connection disc, and connection rod group. Wherein, said cylinder is gradient hydraulic cylinder formed by big cylinder, middle cylinder and piston rod; the connection rod is connected to the gradient hydraulic cylinder; the big cylinder is connected to the middle cylinder; the middle cylinder is connected to the piston rod which is connected to the middle expansion arm; the middle expansion arm is connected to the upper and lower expansion arms via axial pins; the upper and lower expansion arms are individually connected to the upper and lower connection discs via axial pins; and the upper and lower connection discs are sheathed with connection rods. The invention uses direct horizontal expansion, with large expansion force, high speed, little disturb on soil, stable expanded chamber, high anti-cutting property, high efficiency, lower volume, lighter, and improved bearing ability, while it can solve the problem of using large-diameter multi-section expansion post to expand hole, to reduce the operation cost.

The invention relates to the field of water-soluble polymer auxiliary chemicals, in particular to a method for preparing net-shaped cationic polyacrylamide, wherein raw materials are selected from the followings: 200-270 parts of nonionic monomer, 80-170 parts of cationic monomer, 0.006-0.01 part of structure modifier, 600-700 parts of deionized water, 0.08-0.12 part of initiator in parts by weight. The preparation method comprises the steps of: preparing a mixed solution of the nonionic monomer, the cationic monomer and the deionized water, adding the structure modifier into the solution, introducing nitrogen into the solution to remove oxygen, adjusting the pH value to 4- 5, and adding the initiator into the solution to perform polymerization at the temperature of 2-5 DEG C; after the reaction, granulating the polymer, drying the colloidal particles at the temperature of 70-80 DEG C and finally crushing to obtain a product with a net-shaped structure. The product is stronger in the absorption and capture capabilities for colloid and suspended particles in the water, better flocculation effect can be achieved with fewer amount of the product, in addition, flocculation blocks are firm, the shear resistance performance is stronger, and the influence of large shearing force of a centrifugal machine on the flocculation effect is smaller.

The invention discloses an asphalt concrete steel bridge pavement structure comprising a steel bridge (7) derusted by sandblast, an anticorrosive coating (6), a binding layer (5), high-viscosity asphalt embedded compact granular composition concrete bottom layer (3), an oil sticking layer (2) and a high-viscosity asphalt embedded and compact granular composition concrete top layer (1) which are arranged from bottom to top; and furthermore, the invention also provides a pavement method of the asphalt concrete steel bridge pavement structure. According to the asphalt concrete steel bridge pavement structure, the high-viscosity asphalt embedded compact granular composition concrete layers are used as main pavement layers, so that concrete has favorable interlayer binding force and deformation following performance, the generation of cracks can be restrained, so that the whole steel bridge pavement structure has the advantages of favorable track resistance and water seepage resistance.

The invention provides a construction method for an outer wall socket type plate buckle steel pipe scaffold. The construction method is composed of vertical rods, cross rods, inclined pulling rods and the like. The vertical rods are connected with casing pipes in a socket mode. The cross rods and the inclined pulling rods are connected with an inserting plate through wedge-shaped plug pins in the mode that the rod ends and connectors are clamped into the vertical rods, and wall connecting points are arranged to form a geometric invariant structure system. A hanging buckle type profiled steel sheet is laid on the geometric invariant structure system, and the outer side of the hanging buckle type profiled steel sheet is sealed by hanging a safety net so that the safety net can be used for protection and decoration except structural construction. The construction method comprises the specific steps of construction preparation, prefabricated bolt embedding, concrete pouring, I-shaped steel laying, I-shaped steel fixing, U-steel laying, scaffold building and safe protective net hanging. According to the construction method for the outer wall socket type plate buckle steel pipe scaffold, the modularized design is adopted, the structure is simple and firm, assembling and disassembling are convenient and fast, the cost and the loss are reduced, the pollution is low, and the service life is long.

The invention provides a method for forming a structure which combines fiber materials and metallic materials. The structure is formed in one piece by a mould. The method comprises the following steps of: firstly, forming a compound fiber piece; placing the compound fiber piece in a first mould of the mould; secondly, closing the first mould and a second mould of the mould, and making an opening of a mould cavity of the second mould aligned with and attached to the compound fiber piece; and finally, guiding the metal to the mould cavity so as to form a metallic piece on the compound fiber piece. Therefore, the structure has the surface with special tactility, high shearing strength and tensile strength, is light in weight and thin in the body wall, is suitable for the light, thin, short and small design and can be widely applied to shells of electric products; and more importantly, in the forming method of the invention, the combination of the metallic piece and the compound fiber piece possesses proper strength and reliability, the combination procedure is simplified, and the consumption of auxiliary materials is lowered.

The invention discloses an overlapped floor which comprises a plurality of prefabricated reinforced concrete panels and T beam plates. At least one panel is spliced between every two adjacent T beam plates, and the prefabricated reinforced concrete panels and the T beam plates form the integral overlapped floor through post-poured reinforced concrete overlapped layers. According to the overlapped floor, due to the prestress technology and a bidirectional dense rib sandwiching structure form, the use amount of concrete is reduced, dead load is reduced, cost is reduced, and the rigidity and the bearing force of the overlapped floor are improved. Longitudinal rib belts and transverse rib belts are poured through lightweight aggregate structure heat insulation concrete so that the thermal bridge influences on the longitudinal rib belts and the transverse rib belts can be reduced, and meanwhile light filling blocks are matched for improving the heat insulation capability of the overlapped floor. When the overlapped floor is used, the T beam plates and the panels are arranged on a pre-pouring frame beam, and then the integral overlapped floor is formed after post-pouring of the reinforced concrete overlapped layers. The dead load is not increased, the bearing force is ensured, the shearing resisting capability of connecting points is ensured, and meanwhile heat preservation and heat insulation can be achieved; under the premise that the integrity and safety of the overlapped floor are ensured, the construction cost is reduced, and construction is simplified.

The invention discloses microencapsulated crude oil transportation drag reducer slurry. The surfaces of alpha-olefin drag reducing polymer particles which are pulverized at low temperature are coated with hydrophobic nano silicon dioxide films with mass of 0.5-2.0 percent of that of the particles to form the drag reducing polymer into slow-release microcapsules; the slow-release microcapsules are mixed with assistants such as solvent water, a surfactant, a thickener, an anti-freeze agent and a bacteriostatic agent to prepare stable drag reducer slurry. The microencapsulated drag reducer fundamentally eliminates the spontaneous coagulation of the drag reducing polymer particles, so that the storage stability of the drag reducer slurry is obviously improved; the content of the drag reducing polymer is high, the controllable release and a sustaining drag reducing function of the drag reducer are realized, the shear resistance and the average drag reduction rate are improved, and the drag reducer slurry is particularly suitable for drag reduction of long-distance crude oil transportation pipelines.

The invention discloses a composite bridge deck applied to long-span bridges and city bridges. The composite bridge deck comprises a bridge deck body, wherein the bridge deck body is formed through combining a lower wave-shaped steel plate and an upper concrete slab; shear connectors which are symmetrically welded to wave crests of the wave-shaped steel plate upwards extend into the concrete slab; reinforcing steel bars and annular hoop reinforcements which are used for bundling up the reinforcing steel bars are arranged at the middle part of the concrete slab in a balanced manner. According to the composite bridge deck, the characteristics of the wave-shaped steel plate and the characteristics of the concrete slab are combined together, properties of materials are fully utilized, the flexural bearing capacity is enough under heavy loads, the deformation is small enough under the action of concentrated loads, and too-large secondary stress resulting from weld seams can be avoided; a top plate of a steel bridge deck is replaced with the concrete slab, so that the construction cost of a bridge floor system can be reduced; the quantity of welding is very small, so that the damage to the bridge deck caused by defects of a welding process can be reduced; due to the wrinkling effect of the wave-shaped steel plate, the problem that the deformation of the steel plate and the deformation of concrete are non-synchronous can be greatly solved, and the cracking of the transverse bridge direction of the bridge deck is avoided.

The invention discloses an FRP pipe and thick-wall steel pipe compounding hollow recycled concrete pile which is mainly formed by an FRP pipe, a round reinforcement cage framework, a thick-wall steel pipe and recycled concrete. The round reinforcement cage framework and the thick-wall steel pipe are arranged in the FRP pipe, and the round reinforcement cage framework, the thick-wall steel pipe and the FRP pipe are arranged concentrically. The recycled concrete is poured in annular space between the FRP pipe and the thick-wall steel pipe. The bearing capacity and deformation resisting capacity of the single pile can be greatly improved through the built-in thick-wall steel pipe. The wrapping FRP pipe can effectively prevent a pile body from being corroded, and the durability of the pile body is improved. Meanwhile, the FRP pipe and spiral stirrups are combined to restrain the inner recycled concrete, and the bearing force of the compounding pile is further improved. Waste concrete is fully utilized as recycled aggregate, and application and popularization of the recycled concrete in building foundation engineering are facilitated. In a word, the compounding hollow recycled concrete pile has the advantages of being good in pile forming quality, high in bearing force, good in deformation resisting capacity and durability, small in influence on the environment, high in construction speed and the like.

The invention discloses a high embankment slope stabilizing structure. The high embankment slope stabilizing structure comprises a retaining wall, steel pipe piles and anchor rods; the retaining wallis arranged at the foot of a high embankment slope, concrete-filled steel pipe piles are arranged on the inner surface of the retaining wall, an excavation step and a gravel drainage zone are arrangedat a filling and excavation interface, the bottoms of the concrete-filled steel pipe piles and the steel pipe piles penetrate through the gravel drainage zone, and the upper sections of the steel tube piles are sleeved with grouting sleeves correspondingly; the lower end of the grouting sleeves extend to the gravel drainage zone, the upper end of each grouting sleeve is connected with a groutingopening through a grouting pipe, a fixed pulley and a pipeline channel are arranged inside each concrete-filled steel pipe pile, the anchor rods are is fixed in a rock stratum behind the excavation step, the exposed parts of the tops of the anchor rods are connected with steel strands, and the steel strands are connected to the fixed pulleys or the steel pipe piles at the same height; the steel strands connected to the fixed pulleys are led out of crown beam through the pipeline channel and connected with a steel strand tensioning device. The high embankment slope stabilizing structure is suitable for reinforcing and active control of embankment deformation in the embankment construction and operation process, and is particularly suitable for embankment projects with high requirements forembankment stability and later operation safety.

The present invention relates to a modified starch flucculant which has an adjustable cationic degree, has dual functions of agglomeration and flocculation and is used for fine particles, and a synthesizing method thereof. The flucculant uses corn, tuber crops and other soluble starch as backing material. Under the function of ammonium ceric nitrate/nitrate initiator, the methacrylatoethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and acrylamide are respectively grafted on the molecular chain of starch through aqueous solution polymerization for synthesizing a cationic degree adjustable dual-function type starch flocculant. The starch flocculant of the invention has the advantages of adjustable cationic degree, capacity for simultaneously exerting the dual functions of charge neutralization and flocculation bridging, simple technique, short reaction period, moderate synthesizing condition and high grafting efficiency. Furthermore the starch flocculant of the invention has the characteristics of high flocculating setting speed, high light transmittance of supernate, degradable capability, low price, innocuity, etc. The starch flucculant can be widely used for the waste water disposal and sludge dewatering with high fine particle content in the industries of papermaking, dyeing and printing, coal floatation, petrifaction, etc.

The invention provides a multifunctional composite fracturing liquid system. The multifunctional composite fracturing liquid system comprises resistance reduction water and high-viscosity sand carrying liquid, wherein the resistance reduction water comprises 0.02 to 0.15 percent by weight of the resistance reduction agent; the high-viscosity sand carrying liquid comprises 0.2 to 0.75 percent by weight of a thickening agent; the resistance reduction agent and the thickening agent are identical aggregation polymer and are natural modified aggregation polymer and/or organic synthetic aggregation polymer. The low-concentration aggregation polymer having good resistance reduction performance and the high-concentration aggregation polymer having good sand carrying performance are used for forming the multifunctional composite fracturing liquid system; compared with the existing composite fracturing liquid system, the multifunctional composite fracturing liquid system has characteristics of fewer types of additives, simple formula and simple preparation process; meanwhile, the system has good resistance reduction performance, shear resistance and sand carrying performance; return liquid of the system can be reused after being treated in a way such as flocculating, precipitating and filtering, and the utilization rate of water for fracturing is increased.