503 results about "Polymer solution" patented technology

The invention discloses a method for constructing a multicellular living body material by adopting a droplet bioreactor, which belongs to the crossing field of biological materials and microbial engineering, and comprises the following steps: (1) resuspending different cells in different polymer solutions to prepare degradable or phase-separable hydrogel particles containing cells; (2) dispersing the hydrogel particles in a cross-linkable hydrogel matrix to form a composite hydrogel; and (3) curing the composite hydrogel, and then carrying out degradation treatment to obtain the liquid cavity structure multicellular system bioreactor with spatial partition and dynamic interaction characteristics. According to the invention, ordered distribution and metabolism synergy of different microorganisms in space can be realized, controllable degradability and excellent mass transfer performance are realized, bacterial slow release and metabolite exchange can be maintained, and the method is suitable for long-term stable operation of a continuous flow reactor. The method has wide application prospects in the fields of green biological manufacturing, renewable energy source production, environmental restoration, biomedical engineering and the like.

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive pole piece, a negative pole piece and a gel electrolyte, the gel electrolyte is formed by polymerizing an electrolyte prepolymerization solution, and the mass percentages of a cross-linking agent, a monomer and an initiator in the electrolyte prepolymerization solution are A%, B% and C% respectively; a positive electrode material layer in the positive electrode plate is formed by coating the surface of a positive electrode current collector with positive electrode slurry; the positive electrode slurry comprises a fast ion conductor, and the mass percentage content of the fast ion conductor in the positive electrode slurry is X%; the lithium ion battery satisfies the following relational expressions: the formula 1: 5 < B / A < 10; in the formula 2, C / (A + B) is more than 0.005 and less than 0.02; formula 3: 1.7 < = (A + B + C) / X < = 5.5. According to the scheme provided by the invention, a high-performance organic-inorganic hybrid network can be constructed, and the cycle performance of the battery is remarkably improved while the thermal shock performance of the battery is improved.

The invention discloses a high-solid-content MIL-101 (Fe) / PIM-1 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The preparation method comprises the following steps: firstly, dissolving an iron source in a PIM-1 polymer solution to form a homogeneous membrane casting solution; forming the obtained membrane casting solution, and removing the solvent to obtain a PIM-1 / Fe (II) composite substrate containing Fe (III); then, the substrate is alternately immersed in a terephthalic acid methanol solution and a ferric salt methanol solution, and MIL-101 (Fe) is generated in the polymer matrix through in-situ limited crystallization by layer-by-layer limited crystallization. According to the method, the problem of interfacial compatibility between the MOF filler and the polymer matrix is effectively solved, and high loading capacity (up to 52.9 wt.%) of MIL-101 (Fe) is realized without agglomeration. Meanwhile, the membrane has excellent COplasticizing resistance and long-term operation stability, and has a wide application prospect in the fields of carbon capture and the like.

The invention discloses a mixed matrix membrane for efficient oxygen and nitrogen separation and a preparation method and application thereof. The mixed matrix membrane comprises a polymer continuous phase and an MOF filler uniformly dispersed in the polymer continuous phase, the MOF filler can separate nitrogen and oxygen, and the surface of the MOF filler is modified by the silane coupling agent, so that the MOF filler is well compatible with a polymer, and the oxygen-nitrogen separation effect is improved. The polymer solution and the MOF filler dispersion liquid are mixed, the mixed matrix membrane is prepared through the non-solvent induced phase separation method, and the method has the advantages of being simple in reaction condition, high in efficiency, easy to amplify and the like and has wide engineering prospects.

The invention discloses a preparation method of a composite slow-release carbon source, which comprises the following steps: preparing an inner core: uniformly dry-mixing lignin powder and a quick-acting carbon source, and adding a first binder to prepare inner core particles; middle layer wrapping: alternately spraying a second binder and middle layer coating powder until the middle layer is completely wrapped to obtain double-layer particles; outer layer wrapping: alternately spraying a third binder and outer layer coating powder until the outer layer is completely wrapped to obtain three layers of particles; and spraying a biodegradable polymer solution on the surfaces of the three layers of particles to form a coating film. Through the three-layer structural design of the quick start layer, the stable maintenance layer and the long-acting guarantee layer, accurate matching of carbon source release and microbial metabolism requirements is realized. The outer-layer quick-acting carbon source quickly starts microbial activity, the middle layer provides stable and continuous carbon source supply, and the inner core ensures the tail-section treatment effect. The sequential release mechanism effectively avoids burst release waste of the carbon source, so that the utilization rate of the carbon source is greatly improved.

The invention relates to the technical field of energy storage materials, and provides a composite solid polymer electrolyte membrane and a preparation method thereof.The composite solid polymer electrolyte membrane is prepared through the steps that a polymer matrix serves as a matrix, a polar solvent is adopted for dissolving to form a pure polymer solution, then lithium salt and nematic phase liquid crystal E7 are added, a chiral dopant can also be added, uniform printing slurry is formed, and the composite solid polymer electrolyte membrane is obtained through 3D printing. And carrying out hot pressing treatment to prepare the composite solid polymer electrolyte membrane. The electrolyte membrane prepared by the invention has a controllable porous structure, a high dielectric constant and excellent piezoelectricity and energy storage performance, complex structures such as a three-dimensional grid and a porous structure can be directly printed, and the thickness and shape of the membrane can be accurately controlled by adjusting parameters such as a printing path, a layer height and filling density; the method is very suitable for the requirements of rapid customization of product shapes and sizes in the fields of flexible electronics, wearable equipment and the like. The invention also provides an application of the composite solid polymer electrolyte membrane prepared by the method in an energy storage device.

The invention relates to the field of film engineering, in particular to a conductive film and a preparation method thereof. The preparation method comprises the following steps: dissolving a water-soluble high-molecular polymer in a solvent to obtain a polymer solution, dissolving a polyanion electrolyte in the polymer solution, and swelling to obtain a matrix; and obtaining a conductive solution containing the water-soluble conductive polymer, adding the conductive solution into the matrix, and stirring until the conductive solution is homogenized to obtain the spinning solution. And the content of each component in the spinning solution is moderate. And performing electrostatic spinning by using the spinning solution to form the conductive film on the receiver. The conductive thin film is prepared in an electrostatic spinning mode, and manufacturing of the large-area flexible conductive thin film with the micro-nano-scale thickness is achieved. The polyanion electrolyte is added into the spinning solution, so that the binding force between the electroactive component and the carrier polymer is greatly improved, a mechanical phase and an electrical phase form a bicontinuous phase separation state, a gel spinning precursor is formed and drafted into filaments from a needle tip, and a uniform gel-like conductive film is formed on the surface of the receiver.

The invention discloses a preparation method of a graphene composite coating with multifunctional characteristics, which comprises the following steps: processing a substrate, coating a carbon source polymer solution on the surface of a substrate material to form a polymer liquid film, and treating a polymer to form a polymer film; laser induction: carbonizing the polymer film by using laser to form a laser-induced graphene (LIG) coating; functional particles are added, nanoparticles are doped on the surface of the LIG coating in a coating mode, and a composite structure is formed; integrating the multifunctional coating, and forming the graphene-based multifunctional composite coating through post-treatment.

The invention relates to the technical field of gratings, and discloses a polarization holographic two-dimensional grating and a preparation method thereof, an optical waveguide and a two-dimensional pupil expansion method, and the method comprises the steps: forming a light-operated orientation layer film on a substrate; exposing the light-operated orientation layer film to obtain an oriented light-operated orientation layer; coating the photo-alignment layer with a liquid crystal polymer solution mixed with a chiral agent and an initiator to form a liquid crystal polymer film; and curing the liquid crystal polymer film to obtain the polarization holographic two-dimensional grating. Therefore, a two-dimensional grating can be directly prepared without depending on multi-area grating combination to realize bidirectional expansion of light beams, the view field range is expanded, the technological process is simplified, the manufacturing complexity and the preparation cost are reduced, and meanwhile, the consistency and high performance of mass production are guaranteed; in addition, the integrated design of the two-dimensional grating can avoid the problem of uneven brightness caused by traditional multi-assembly splicing, the overall brightness uniformity and the imaging display effect are effectively improved, and a low-cost and high-performance implementation path is provided for optical waveguide two-dimensional pupil expansion.

The application discloses an oil and gas field polymer solution viscosity protection system with improved ferrous ion tolerance, and belongs to the technical field of oil and gas field chemicals.The system comprises the following components in mass percentage: 5-10% of a ferrous ion stabilizer, 10-20% of a free radical capturing agent, 10-20% of a structure reinforcing agent, 5-10% of a synergist, and the balance of water; the ferrous ion stabilizer is at least one selected from sodium gluconate, potassium gluconate, diethylene triamine pentaacetic acid and hydroxyethylidene diphosphonic acid; the free radical capturing agent is a compound containing phenolic hydroxyl; the structure reinforcing agent is an imidazoline compound; and the synergist is an aldehyde compound.The application method of the viscosity protection system is as follows: the viscosity protection system is first added into liquid water, polymer powder is then added, a gel breaker is further added, and stirring is uniformly performed to obtain a polymer solution.The viscosity protection system significantly reduces the influence of ferrous ions on the viscosity of the polymer solution, and improves the application effect of polyacrylamide substances in the field of oil and gas fields.

The utility model discloses a salt separation nanofiltration membrane production coating device which comprises a fixing frame, a coating roller, a solution tank, a guide roller and a drying box, the guide roller which is rotatably connected is arranged on the inner wall of the fixing frame, the guide roller is composed of an upper roller and a lower roller, the upper roller and the lower roller are longitudinally distributed in a staggered mode, the coating roller is arranged on the side wall of the upper roller, and the solution tank is arranged in the coating roller. A solution tank is arranged below the coating roller, a liquid injection pipe is arranged on the right side wall of the solution tank, a drying box is fixedly connected to the top of the fixing frame, a fan, a heating coil and an air guide plate are fixedly connected to the interior of the drying box, the fan is fixedly connected to the upper portion of the heating coil, the air guide plate is arranged below the heating coil, and an air outlet is formed in the lower surface of the air guide plate. The coating device is composed of the fixing frame, the coating roller, the solution tank, the guide roller and the drying box, a polymer solution is evenly coated on the surface of a carrier while the carrier is conveniently guided and conveyed, and the drying box fixedly connected with the top is matched, so that the solution is conveniently and rapidly dried and shaped.

This application relates to the field of functional crystalline material preparation and microfluidic application technology, specifically disclosing a method and product for preparing formate crystals using core-shell microcapsules, including the following steps: (1) dissolving a solid alkaline raw material in a formic acid solution to prepare reaction solution a; (2) separately conveying polymer solution A and polymer solution B with phase separation characteristics, and reaction solution a, so that they are mixed at the intersection of microchannels to prepare dispersed phase b, which is then introduced into the assembly zone for phase separation assembly to form core-shell microcapsules; (3) the core-shell microcapsules are crystallized in a continuous temperature-changing crystallization zone to form formate solid; (4) the formate solid is collected, washed and dried sequentially to obtain the target product; (5) the oil layer is continuously extracted and returned to the assembly zone for recycling. The formate crystals prepared in this application not only have a large particle size, but also exhibit good size uniformity and morphological repeatability, and have the advantages of high throughput, green environmental protection, and simple operation.

The application discloses a kind of multi-element ultra-high temperature nanocomposite ceramic matrix composites and preparation method thereof, the multi-element ultra-high temperature nanocomposite ceramic matrix composites are composed of multi-element ultra-high temperature nanocomposite ceramic and porous fiber body, wherein multi-element ultra-high temperature nanocomposite ceramic is composed of oxygen-free silicon-based ceramic and multi-element transition metal carbonitride uniformly distributed therein, and the preparation method is: at least two metal element complexes are reacted with silicon-based polymer to obtain single-source precursor polymer;Then porous fiber body is placed in single-source precursor polymer solution for multiple times of impregnation pyrolysis, and the composite material provided by the application has a nanocomposite structure, an ultra-high temperature ceramic multi-element single-phase solid solution, the type, content and ratio of metal elements can be adjusted, the ultra-high temperature ceramic in the matrix is uniformly distributed and has a nanoscale grain size, and the method can avoid damage to the fiber during preparation, thereby achieving simultaneous improvement of the mechanical properties and oxidation ablation resistance of the composite material.

This invention belongs to the technical field of large-channel or dominant channel treatment and plugging in water-driven oil reservoirs, specifically involving an in-situ modification and plugging method within fly ash reservoirs. The method includes: mixing a modified working fluid and fly ash; pumping the resulting mixture into a sand-filled pipe at a constant rate; and then allowing it to stand at reservoir temperature, resulting in modified fly ash and simultaneous plugging. This invention transfers the fly ash modification treatment from the surface to the reservoir pores, achieving the same modification effect as surface modification while simplifying the process, avoiding investment in surface treatment equipment, and saving on waste liquid treatment costs. Furthermore, the waste liquid contains alkali and polymer solutions, forming an "alkali / polymer" binary system, which helps improve oil displacement efficiency. Therefore, the in-situ modification treatment and combined plugging effect within fly ash reservoirs can effectively expand the swept volume and improve oil displacement efficiency, significantly increasing oil recovery.

Methods of preparing a polymer solution for organic electrochemical transistor preparation include preparing a solvent solution, preparing a dopant solution, and combining the solvent solution and the dopant solution at 60 to 90 volume percent solvent solution and 10 to 40 volume percent dopant solution. Preparing the solvent solution includes degassing a first solvent to form a degassed first solvent and combining the degassed first solvent with a polymer. Preparing the dopant solution includes degassing a second solvent to form a degassed second solvent and combining the degassed second solvent with a p-dopant.

Mechanically and piezoelectrically anisotropic polymer fibers may be formed by spinning a polymer solution or gel that includes a high molecular weight crystallizable polymer and a liquid solvent. The solvent may be configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the spun fibers. The polymer solution may also include a low molecular weight additive. The high and low molecular weight polymers may each be characterized by a bimodal molecular weight distribution where the molecular weight of the additive is less than the molecular weight of the crystallizable polymer. The polymer(s) and the additive(s) may be independently selected from vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropene, vinyl fluoride, etc. The spun fibers may be oriented, annealed, poled, and woven or laminated to form a polymer thin film having a high elastic modulus and a high electromechanical coupling factor.

The utility model relates to the technical field of coating mechanisms, in particular to a supply coating mechanism of a nanofiber electrostatic spinning machine, which comprises a plurality of metering pumps, a plurality of liquid inlet pipes and an adjusting rotating mechanism, and the adjusting rotating mechanism comprises a rotating column, a rotating frame, a driving assembly, a plurality of coating blocks, a plurality of coating pipes, a plurality of dismounting assemblies and an auxiliary assembly. The rotating column and the driving assembly are installed in the electrostatic spinning machine, the number of the coating blocks is selected according to needs, the rotating frame is inserted, the multiple electrostatic spinning pieces are embedded into the multiple coating grooves respectively, the driving assembly is fixed and started through the multiple disassembling and assembling assemblies respectively, and under cooperation of the auxiliary assembly, the rotating frame rotates with the rotating column as a rotating shaft; the multiple coating blocks are driven to rotate, the multiple metering pumps are started, and polymer solutions are injected into the multiple coating grooves through the multiple liquid inlet pipes and the multiple coating pipes correspondingly, so that supply coating is conducted on multiple pieces of electrostatic spinning, and the effect of improving the adaptability of the mechanism is achieved.

The invention relates to the technical field of medical biopolymer materials, in particular to a two-component gynecological gel spray and a using method thereof.The two-component gynecological gel spray comprises a first component and a second component, and the first component at least comprises formylated multi-arm polyethylene glycol, formylated poloxamer and a solvent; the second component at least comprises a multi-amino polymer solution, the bi-component solution forms a film in the vagina and is cured in situ, and the vaginal gel has the characteristics of strong adhesion and strong corrosion resistance, can act on the vagina for a long time to realize long-acting treatment, and is more convenient to use and better in effect.

The invention relates to the field of preparation of mullite materials, in particular to a method for preparing mullite porous hollow microspheres by an electrostatic spinning technology. The method for preparing the mullite porous hollow microspheres by the electrostatic spinning technology comprises the following steps: mixing an inner-layer polymer with a first solvent to obtain an inner-layer polymer solution; mixing the mullite precursor with a second solvent to obtain an outer layer polymer solution; performing electrostatic spinning on the inner-layer polymer solution and the outer-layer polymer solution by adopting a coaxial electrostatic spinning technology to obtain precursor microspheres; carrying out curing heat treatment on the precursor microspheres to obtain cured and crosslinked precursor microspheres; calcining the cured and crosslinked precursor microspheres, so as to obtain mullite porous hollow microspheres; wherein the humidity of the electrostatic spinning is 30-60%. According to the invention, the porous structure and hollow structure combined mullite microspheres are prepared by adopting an electrostatic spinning technology, and a new method is provided for preparation of the porous hollow mullite microspheres.

The invention discloses a method for rapidly determining the hydrolysis degree of an acrylamide polymer, which comprises the following steps: preparing a polymer solution from a to-be-determined polymer, dropwise adding acid into the polymer solution, and determining the hydrolysis degree of the acrylamide polymer according to an ionization constant expression and the pH change of the polymer solution after dropwise adding the acid under the condition that the ionization constant of the polymer tends to be stable. The amount of sodium carboxylate groups in the polymer solution is determined, the ratio of the sodium carboxylate groups to the total number of polymer chain links is calculated according to the amount of the sodium carboxylate groups, and the hydrolysis degree of the to-be-measured polymer is obtained; the problems that a specific pH value is approximately used as a judgment basis for reaching a titration end point in an existing hydrolysis degree detection method, but the actual situation is that the pH values are different when polymers with different hydrolysis degrees reach the titration end point, so that measurement errors are caused are effectively solved.

The invention discloses a polyester polymer microsphere containing hyaluronic acid (sodium) and a preparation method of the polyester polymer microsphere, the hyaluronic acid (sodium) is dispersed in a microsphere body, and the hyaluronic acid (sodium) accounts for 2-20% of the weight of the polyester polymer microsphere. The preparation method of the microspheres comprises the following steps: dispersing hyaluronic acid (sodium) in a polyester polymer solution in a non-solution form to obtain a polyester polymer solution in which hyaluronic acid (sodium) is dispersed; the step of dispersing the hyaluronic acid (sodium) in the non-solution form is that the hyaluronic acid (sodium) is dispersed in the form of solid particles or a solid particle suspension; in the polyester polymer solution, the solvent for dissolving the polyester polymer is a volatile solvent. The microspheres provided by the invention can wrap hyaluronic acid (sodium) with higher content, and have better stability.

The application belongs to the technical field of flexible piezoelectric materials, and discloses a grafted ferroelectric polymer thin film with a high piezoelectric coefficient and a preparation method thereof, wherein the preparation method comprises the following steps: obtaining a polymer solution by selecting a polyvinylidene fluoride-based ferroelectric polymer; adding a grafting agent reagent to the polymer solution and uniformly mixing to obtain a mixed solution; uniformly casting the mixed solution on the surface of a glass substrate, heating in an oven to volatilize the solvent, then increasing the temperature of the oven to perform a grafting reaction to obtain a grafted thin film; after the oven is naturally cooled to room temperature, the grafted thin film is peeled off from the glass substrate, and a polarization process is adopted to obtain the grafted ferroelectric polymer thin film with a high piezoelectric coefficient. The polyvinylidene fluoride-based ferroelectric polymer is modified by grafting side chains, the relative stability of different molecular conformation energies in the ferroelectric polymer is regulated by grafting side chains in the polymer, the ferroelectric phase and the relaxor phase in the ferroelectric polymer are induced to compete with each other, and the piezoelectric coefficient of the material is significantly improved.

This invention discloses a method for preparing a self-healing, antibacterial dynamic hydrogel and its coating application. The method includes: 1. Reacting konjac glucomannan with sodium periodate to achieve aldehyde functionalization, and mixing it with sodium alginate powder to prepare a precursor polymer solution A; 2. Mixing an acylhydrazide or hydroxylamine small molecule crosslinking agent with an aminoglycoside drug to prepare an amino crosslinking agent solution B, and preparing a calcium salt ionic crosslinking agent solution C; 3. Mixing the three solutions and allowing them to stand to obtain a hydrogel. The application involves coating a hydrogel mixture solution onto a biodegradable metal surface after preparing a polyethyleneimine auxiliary layer and then gelling it. This invention utilizes aldehyde-functionalized oxidized konjac glucomannan and two crosslinking agents to form acylhydrazone, oxime, and imine bond networks, endowing the hydrogel with self-healing, self-responsive, and long-term antibacterial properties. The hydrogel of this invention improves the biocompatibility, antibacterial properties, and stability of biodegradable metal substrates, making it suitable for biodegradable implantation applications.

The application discloses a kind of polymer porous membrane, its preparation method and application in turbidity removal pre-filtering, belong to the technical field of porous membrane preparation.Its technical scheme includes: when the non-solvent phase separation of film-forming polymer solution occurs and the separation layer is formed on the outer surface of polymer membrane, simultaneously, water-soluble coating layer polymer solution is coated on the surface of separation layer, to obtain polymer porous membrane;Film-forming polymer solution uses polysulfone polymer as film-forming base material, uses water-soluble chloride as porogen, uses nitrogen-containing organic matter as solvent;Coating layer polymer solution has porogen effect, and viscosity is 200-1000 mPa·s.The application is applied to turbidity removal pre-filtering, solves the technical problems that existing non-solvent phase separation technology is difficult to obtain large aperture, surface opening rate is high and easy to appear finger-shaped hole, has the characteristics of large aperture, surface opening rate is high, cross section is sponge hole.

The invention discloses an anaerobic denitrifying bacterial agent as well as a preparation method and application thereof, and belongs to the technical field of water environment treatment. The anaerobic denitrifying bacterium agent is prepared from the following components in parts by weight: 15 to 30 parts of sterile water, 15 to 60 parts of normal saline, 5 to 10 parts of micro-capsule embedded anaerobic denitrifying bacteria, 5 to 20 parts of a porous composite modified carrier, 10 to 30 parts of a carbon source, 4 to 7 parts of nutrient elements, 2.5 to 4 parts of a buffering agent and 1 to 5 parts of a stabilizer, the micro-capsule embedded anaerobic denitrifying bacteria are obtained by embedding anaerobic denitrifying bacteria with an alginic acid gel solution and a calcium chloride solution; the porous composite modified carrier is obtained by crosslinking modified nano iron oxide, modified nano titanium dioxide, a functional polymer solution and glutaraldehyde. The anaerobic denitrifying bacterial agent provided by the invention can effectively improve the efficiency of treating nitrogen pollution of a water body.

This invention discloses a method for preparing a thermosensitive hemostatic gel, which is prepared by mixing a thermosensitive polymer solution with a solution of micron-sized polymer particles or microspheres with hemostatic function. The concentration of the solution of micron-sized polymer particles or microspheres with hemostatic function is 3-100 mg / mL; the concentration of the thermosensitive polymer solution is 200-450 mg / mL; the diameter of the micron-sized polymer particles or microspheres with hemostatic function is 300-900 micrometers; the gelation temperature of the thermosensitive hemostatic gel from a flowing liquid state to a solid state is greater than 15 degrees Celsius, and it is a flowing liquid state at temperatures below 15 degrees Celsius. Under the condition of warming up in response to the human body temperature, the flowing liquid hemostatic gel transforms into a solid hemostatic gel, thereby achieving the hemostatic function. The micron-sized polymer particles or microspheres in the thermosensitive hemostatic gel will not enter the damaged blood vessel during the hemostasis process.

The application relates to the field of optical films, in particular to a preparation method of an optical diffusion film. The preparation method of the optical diffusion film comprises the following steps: uniformly mixing a curing agent with polydimethylsiloxane, curing, then performing oxygen plasma treatment and room temperature aging treatment to obtain a polydimethylsiloxane flat plate; dissolving PET particles and PMMA particles in a solvent to obtain a polymer solution; placing the polydimethylsiloxane flat plate above the polymer solution and standing to obtain the optical diffusion film. In the application, PMMA is used as a high glass transition temperature component to be blended with PET, the overall glass transition temperature of the blended system is improved, and the practicability of the optical diffusion film in a high-temperature environment is improved; strong scattering is provided by the difference between the refractive indexes of air holes and a polymer phase, a refractive index gradient is formed by using the refractive index difference between PET and PMMA, a secondary scattering interface is formed, high haze is ensured, light absorption is reduced, and high transmittance is maintained.

A method for determining the degree of degradation of a polymer solution comprising a polymer dissolved in water with a certain salinity and used in an enhanced oil recovery (EOR) process, said method comprising the following steps: determining the critical deformation rate scr and the dimensionless parameter Υ; and comparing the effective local deformation rates occurring in the flow within a given flow device with the critical deformation rate scr and the parameter Υ so as to determine whether or not degradation occurs in any region of the flow in a computational fluid dynamics simulation.

This invention relates to a particle-polymer aggregate composite oil displacement agent and its application. The oil displacement agent of this invention comprises: (A) a particle suspension containing particles and water, wherein the mass fraction of the particles is 200-2000 ppm; and (B) a polymer solution containing a polymer and water, wherein the mass fraction of the polymer is 0.01-10 ppm, and the polymer is one of the following: (B1), (B2), or (B3): (B1) an ionic polymer, wherein the ionic polymer is a cationic or anionic polymer, wherein the charge of the ionic groups on the polymer molecular chain is opposite to the charge of the particle surface; (B2) a mixture of cationic and anionic polymers; (B3) a naturally aged nonionic polymer. The oil displacement agent of this invention is low in cost, easy to inject, has a high sealing effect, and good oil displacement effect.

The application discloses a polymer drag-reducing agent injection type hydrofoil, and belongs to the technical field of polymer drag-reducing agents of underwater vehicles. The application solves the problem that there is no drag-reducing agent injection structure capable of stably outputting polymer drag-reducing agents and capable of adhering to the surface of a drag-reducing part of an underwater vehicle. One end of a steady flow cavity is communicated with a solution storage box in the underwater vehicle through a discharge channel, a cover plate is parallel and slidingly inserted on a main body of the hydrofoil, the lower surface of the cover plate is adhered to the upper surfaces of a plurality of fairing plates, and the outer surface of one end of the cover plate and the inner wall surface of one end of the steady flow cavity form an injection channel. The steady flow cavity has a steady flow effect on the solution, so that the stable output of the polymer solution is realized; the flow state of the polymer solution is adjusted through the fairing plates, so that the polymer solution flows stably; the polymer solution flows out to the surface of the hydrofoil through the injection channel, the frictional resistance generated during sailing is reduced, and the sailing performance of the underwater vehicle is improved.