142 results about "Shear viscosity" patented technology

The invention provides a secondary battery, a preparation method of the secondary battery and an electronic device, the secondary battery comprises a positive electrode plate, a negative electrode plate, a diaphragm and an electrolyte, the negative electrode plate comprises a negative electrode current collector and a negative electrode material layer located on at least one surface of the negative electrode current collector, and the negative electrode material layer comprises hydrophobic modified polyacrylic acid; powder of the negative electrode material layer is dissolved in deionized water to obtain first slurry with the solid content of 45 wt%-50 wt%, the shear rate is 0.1 S <-1 >, the shear viscosity eta of the first slurry is 1 mPa.s, and eta is larger than or equal to 1000 and smaller than or equal to 30000. When the negative electrode material layer comprises the hydrophobic modified polyacrylic acid, in the preparation process of the negative electrode plate, the negative electrode slurry containing the hydrophobic modified polyacrylic acid has the characteristic of high viscosity under low shear, so that the risk of edge thinning after coating is reduced, and the electrode assembly interface in the later period of circulation is improved.

The invention provides a method for coating slurry on the surface of a sintered neodymium-iron-boron matrix, a preparation method of a sintered neodymium-iron-boron magnet and the slurry. The method for coating the surface of the sintered neodymium-iron-boron substrate with the slurry comprises the steps that the slurry is prepared; wherein the slurry comprises powder containing heavy rare earth elements, an organic solvent and a binder, and the viscosity of the slurry is 2000-5000 mPa.s; and coating the surface of the sintered neodymium-iron-boron substrate with the slurry by adopting a roller coater to form a coating layer. The slurry provided by the invention is low in viscosity, good in flowability, low in thixotropy, low in shear viscosity mutation rate and low in temperature sensitivity, the weight gain uniformity of magnets in each batch and between batches is good, and the coercive force is obviously improved.

An adhesive for a tennis ball includes base rubber. The base rubber contains, as a main component thereof, liquid rubber having a number average molecular weight of not less than 10,000. The adhesive has a shear viscosity of not greater than 2,000 Pa·s. A tennis ball includes a hollow core made of a rubber material. The core includes two hemispherical half cores. The two half cores are adhered to each other by using the adhesive for a tennis ball.

The present application provides a high-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus. The method comprises: continuously extruding a material under test as a melt, measuring and recording an inlet pressure P. a mass growth rate w, and the diameter D′ of a melt sample strip, and obtaining apparent shear viscosity ηa(t) (step A1); obtaining an outlet expansion rate δ (step A2); recording and displaying curves ηa(t) and δ(t), and treating the time corresponding to an increase of a set percentage on the curves as a cross-linking starting time TX (step A3); selecting a reference sample for testing, and determining a cross-linking reaction starting time TS according to ηa(t) and δ(t) curves of the reference sample (step A4); and defining an index α according to TX and TS.

This invention provides an interlayer film for sandwich photoactive devices and a sandwich photoactive device. The interlayer film for sandwich photoactive devices has the following characteristics: after heat treatment at 90-140℃ for 30-240 minutes, the shear viscosity is 7000-12000 Pa·s at 90℃ and a shear rate of 20 / s, and 5000-9000 Pa·s at 110℃ and a shear rate of 20 / s. The interlayer film provided by this invention has good adhesion and can effectively solve the problem of delamination in sandwich photoactive devices.

This invention provides a low-emission starch-based biodegradable composition and its application. By weight, the low-emission starch-based biodegradable composition comprises 40-92 parts of flexible polyester, 2-10 parts of polylactic acid, 5-35 parts of starch, and 1-15 parts of plasticizer; the zero-shear viscosity of the flexible polyester is 1100-10000 Pa·s; in this invention, a flexible polyester with a specific zero-shear viscosity is compounded with polylactic acid, starch, and plasticizer, resulting in a lower content of aldehyde compounds in the products processed from the biodegradable composition.

This invention discloses a polypropylene composition, its preparation method, and its applications, belonging to the field of polymer materials technology. The polypropylene composition provided by this invention comprises the following components in parts by weight: 23-62 parts PP resin, 18-32 parts POE elastomer, 1-7 parts chopped glass fiber, and 13-27 parts mica powder; wherein the PP resin is prepared at a temperature of 200°C and a shear rate of 100 s. ‑1 melt shear viscosity η PP With POE elastomer at a temperature of 200℃ and a shear rate of 100s ‑1 melt shear viscosity η POE The ratio η PP / η POE The aspect ratio of the chopped glass fibers is 0.38-1.65; the aspect ratio of the chopped glass fibers is 280-350; and the D50 diameter of the mica powder is 15-35 μm. The polypropylene composition provided by this invention has a low linear coefficient of thermal expansion and high coating adhesion.

The present disclosure relates to a polyamide composition, a polyamide self-crimping fiber, and a method for preparing the polyamide self-crimping fiber. The polyamide composition comprises a first component comprising polyamide 56 and a second component comprising polyamide X, wherein the polyamide X comprises polyamide 510 and / or polyamide 6; a mass ratio of the first component to the second component is (40～60) : (40～60); and a difference between the shear viscosity V56 of the first component and the shear viscosity VX of the second component satisfies: V56 -VX=15～70 Pa·s; wherein, V56 and VX are the shear viscosities of the first component and the second component, respectively, measured by a capillary rheometer at a testing temperature of 270℃ and a shear rate of 10000 s-1. The polyamide composition according to an embodiment of the present disclosure can be used to prepare polyamide self-crimping fibers, which can result in fibers with good mechanical properties and excellent elasticity.

The application relates to the technical field of particle flow simulation, in particular to a CAE simulation method for C-type particle flow state based on a double Euler model, which defines model parameters under a secondary agglomeration theoretical model according to the agglomeration mechanism of C-type particles from initial agglomeration to secondary agglomeration, the model parameters including particle phase diameter, particle phase density, particle phase volume fraction and particle phase shear viscosity, thereby establishing a local dynamic agglomeration particle model (LDAP model) for C-type particles based on an Euler multiphase flow model, and performing C-type particle flow state simulation; the method can realize the setting of numerical simulation conditions and the simulation of the flow behavior of C-type particles through simple flow field calibration and parameter setting, can intuitively reflect the real-time state of the particle agglomerate diameter at any local position in the flow field, has higher accuracy in describing the motion state of particles and gas under the condition of particle agglomerate diameter difference, and can balance the calculation efficiency without increasing the number of particle phases for varying particle diameters.

The present invention pertains to a multi-part cosmetic composition which has both a physical property providing good adhesion for preventing dripping during mixing at the time of use and during application to keratin tissues such as skin and hair, and a physical property providing ease of spreading after application.　The present invention provides a multi-part cosmetic composition which comprises a plurality of constituent preparations including a preparation I and a preparation II, wherein the preparations I and II each comprise a component (A) that is an ionic surfactant, a component (B) that is a cationic polymer, a component (C) that is a higher alcohol, and a component (D) that is a nonionic surfactant and have different viscosities at least at 30°C, and all of the constituent preparations are mixed together upon use. The viscosity ratio (preparation II / preparation I) of the viscosity of the preparation II at 30°C to the viscosity of the preparation I at 30°C is 3 or more, and the ratio of the shear viscosity a of a mixture prepared by mixing all of the constituent preparations together at a shear rate of 0.0037 S-1 to the shear viscosity b of the mixture at a shear rate of 139 S-1, i.e., (shear viscosity a / shear viscosity b), is 5000 or more when the shear rate is changed from 0.001 S-1 to 1000 S-1 and the shear viscosities are measured with a rheometer at 25°C.

To provide a measuring device and a measuring method capable of separately determining a diffusion coefficient of particles contained in a fluid and an advection velocity of the fluid, and determining a shear viscosity characteristic and a temporal characteristic of a non-Newtonian fluid by on-site observation, in the measuring device formed by combining OCT and DLS.SOLUTION: A coupling optical unit that couples reflected or scattered light with reference light that is not reflected or scattered by the observation object, a detection unit that detects coupled light coupled by the coupling optical unit, and a control unit that acquires an optical coherence tomographic image of the observation object on the basis of the coupled light, the control unit records an optical coherence tomographic image of the fluid from the acquired optical coherence tomographic image of the observation object, obtains each of characteristic values representing degrees of thermal motion and advective motion of particles contained in the fluid based on the optical coherence tomographic image of the fluid, and outputs position information of each of the characteristic values in a two-dimension space and time information representing a temporal change of the characteristic value.SELECTED DRAWING: Figure 2-1

The invention provides an injection hydrogel for vascular embolism treatment and a preparation and formula optimization method thereof. The hydrogel formula comprises two or more 2-arm or multi-arm polyethylene glycol polymers containing functional groups which can be cross-linked with each other, lithium magnesium silicate and a contrast agent. The formula optimization method comprises the following steps: designing an orthogonal experiment, systematically investigating the influence of raw material factors (such as polyethylene glycol molecular weight, functional groups, concentration and the like) on product performances of shear viscosity eta, compression strength sigma c and tensile strength sigma t, and obtaining basic experiment data; establishing a chemical reaction kinetic model and a product performance prediction model based on machine learning based on the data; determining a multi-objective optimization objective function according to product performance requirements; establishing a non-linear multi-objective equation set for formula optimization in combination with a material proportioning relationship; solving the optimization model by adopting an intelligent optimization algorithm to obtain a preliminary optimization formula; carrying out an optimization experiment under a small-scale test condition to obtain new experiment data, and updating model parameters; and the optimization iteration is repeated until convergence.

To provide an adhesive sheet having such a form that an adhesive layer is laminated on a fiber substrate, and achieving both hot melt coating property and excellent adhesive performance.SOLUTION: An adhesive sheet including a fiber substrate and an adhesive layer laminated on the fiber substrate is such that: an adhesive forming the adhesive layer contains a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, a tackifier resin and a plasticizer; the adhesive has a shear viscosity at 195°C of 1,300 Pa s or more and 3,000 Pa s or less; the fiber substrate has a basis weight of 30 g / m2 or less, and a thickness of 60 μm or less; and an organic residual solvent content in the adhesive layer is less than 1,000 ppm.SELECTED DRAWING: Figure 1

Provided is a polyurea which has a number-average molecular weight Mn of 6,000-50,000, and in which the ratio (ηEa / ηEb) of the shear viscosity ηEa (Pa･s) at a shear rate of 0.1 (1 / s), measured at 20°C above melting point, to the shear viscosity ηEb (Pa･s) at a shear rate of 10 (1 / s), measured at 20°C above melting point, is 1.1-10.0.

A photo-curable composition can include a photo-curable resin and a photoinitiator. The photo-curable composition can typically have a shear viscosity of less than 1 Pa·s at 100° C. at a shear rate of 50 s−1 and can typically include a first prepolymer, a second prepolymer, and a reactive diluent.

This invention discloses a method for reverse regulation of asphalt based on multi-parameter coupling of chemical composition, multi-level structure, and rheological properties. The method acquires multi-dimensional data such as chemical composition parameters (component content and elemental content), multi-level structural characteristics (molecular packing, micelles, and colloidal structure), and rheological property indices (zero-shear viscosity, low-temperature complex modulus, temperature sensitivity, and crossover frequency) of asphalt. Based on this, statistical screening and correlation analysis methods are used to establish the multi-parameter coupling relationship between the chemical composition, multi-level structure, and rheological properties of asphalt, identify the main controlling factors, construct their regulation paths, and establish a reverse regulation framework that infers the structure and composition from the target rheological properties. This invention complements traditional empirical trial-and-error methods and design methods based on single performance indicators, enabling systematic analysis and comprehensive regulation of asphalt material properties from a holistic perspective of multi-parameter coupling, thus improving the scientific rigor and reliability of on-demand material design.

The present application provides a high-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus. The method comprises: continuously extruding a material under test as a melt, measuring and recording an inlet pressure P, a mass growth rate w, and the diameter D′ of a melt sample strip, and obtaining apparent shear viscosity ηa(t) (step A1); obtaining an outlet expansion rate δ (step A2); recording and displaying curves ηa(t) and δ(t), and treating the time corresponding to an increase of a set percentage on the curves as a cross-linking starting time TX (step A3); selecting a reference sample for testing, and determining a cross-linking reaction starting time TS according to ηa(t) and δ(t) curves of the reference sample (step A4); and defining an index α according to Tx and Ts.

Described herein is an absorbent article having an absorbent core. The absorbent core includes a superabsorbent polymer material and an auxiliary adhesive. The auxiliary adhesive includes from about 20% to about 70% of a first polymer and from about 30% to about 80% of a second polymer. The auxiliary adhesive has a Shear Viscosity at 10 (1 / s) at 230° C. of from about 300 mPa·s to about mPa·s.

The invention belongs to the technical field of geotechnical engineering test devices, and particularly relates to a test device for measuring shear viscosity of sandy soil in a lateral confinement stress state. The soil sample lateral confinement rotating mechanism comprises a rotating cylinder and a constraining frame, and the rotating cylinder is used for laterally constraining a soil sample and rotating along with the soil sample in an experimental test; the torque loading mechanism is arranged above the soil sample lateral confinement rotating mechanism and is used for applying torsion to the soil sample in the rotating cylinder and measuring the torque at the same time; the lifting mechanism is arranged on the rack and is used for adjusting the height of the torque loading mechanism; the vertical loading mechanism is arranged on the rack, is positioned below the soil sample lateral confinement rotating mechanism, and is used for applying vertical pressure to the soil sample in the rotating cylinder and measuring the pressure at the same time. According to the invention, the complex stress state of the sand foundation in the actual engineering can be simulated, and the test precision is improved.

The invention discloses a processing method for preventing the edge of a positive plate from being too thick and the positive plate, and the processing method comprises the following steps: S1, slurry pretreatment: filtering positive slurry through a precise filter screen, adding a nonionic surfactant, and uniformly stirring; s2, slurry rheology regulation and control: carrying out shear pretreatment on the slurry until the shear viscosity is 1200-1800 mPa.s; s3, a die head gasket is optimized, specifically, an inwards-concave wedge-shaped gasket is adopted, the edge thickness of the gasket is smaller than that of a central area, and a fluid resistance gradient field is formed; s4, coating is controlled through pressure pulsation, specifically, pressure fluctuation in a die head is monitored in real time through a pressure feedback system, and the extrusion speed is dynamically adjusted according to the monitoring result; and S5, differential drying treatment: enabling the coated positive plate to pass through a multi-section drying system, wherein the drying temperature of an edge area is 15-25 DEG C lower than that of a central area. The processing method provided by the invention can effectively prevent the problem that the edge of the positive plate is too thick, and improves the performance and safety of the battery.

To provide a multi-agent type cosmetic composition having both physical properties of exhibiting good adhesiveness to prevent dripping when mixed in use or when applied to keratin tissues such as skin and hair, and physical properties of exhibiting spreadability after application.SOLUTION: A multi-agent type cosmetic composition comprising a plurality of constituent agents including the following components (A) an ionic surfactant, component (B) a cationic polymer, component (C) a higher alcohol, and component (D) a nonionic surfactant, wherein the composition comprises agents I and II having different viscosities at least at 30°C, and the viscosity ratio (agent II / agent I) of the viscosity of agent II at 30°C to the viscosity of agent I at 30°C is 3 or more, and a ratio (shear viscosity a / shear viscosity b) of a shear viscosity a at a shear rate of 0.00037 s-1 to a shear viscosity b at a shear rate of 139S-1, which is measured by a rheometer at 25 °C. when the shear rate is changed from 0.0001 s-1 to 10000s-1, is 5000 or more.

The invention relates to a polyamide composition, a polyamide self-crimping fiber and a preparation method thereof, the composition comprises a first component and a second component, the first component comprises polyamide 56, and the second component comprises polyamide 6; the mass ratio of the first component to the second component is (45-55): (45-55); the difference value between the shear viscosity V56 of the first component and the shear viscosity V6 of the second component meets the following relationship: V56 and V6 are equal to 15-70 Pa.s; wherein V56 and V6 are respectively shear viscosities, measured by a capillary rheometer, of the first component and the second component under the conditions that the temperature is 270 DEG C and the shear speed is 10000 s <-1 >. The polyamide composition provided by the embodiment of the invention is used for preparing polyamide self-crimped fibers, and the prepared fibers can have good mechanical properties and excellent elasticity.

A conductive material dispersed solution includes an acrylic dispersant containing an acrylic compound, a conductive material, and a dispersion medium. A solids content of the conductive material dispersed solution is 3% by weight or more, and a shear viscosity value of the conductive material dispersed solution measured at 25° C. and a shear rate of 1 / s is 70 Pa·s or less. Provided is a conductive material dispersed solution, in which the conductive material is pre-dispersed to an excellent level through an acrylic dispersant to effectively improve dispersibility of the conductive material when added to the cathode slurry composition, and high solids characteristics of the cathode slurry and the like may be secured by suppressing aggregation between active material particles in the cathode slurry.

A composition contains: (a) a first polyorganosiloxane; (b) 50-80 volume percent, based on composition volume, of conductive fillers; and (c) 0.1 to 2.0 weight-percent, based on composition weight, of a second polyorganosiloxane different from the first polyorganosiloxane, the second polyorganosiloxane having an average of 0.5 to 1.5 anhydride groups per molecule.

Disclosed is a polyamide block copolymer which comprises: a polymer block (A) that has a glass transition temperature of more than 20°C; and a polymer block (B) that has a glass transition temperature of 20°C or less. The polymer block (A) contains 50 mol% or more of a constitutional unit that is derived from a semiaromatic polyamide. The polyamide block copolymer has a complex shear viscosity η0 of 500-10,000 (Pa∙s) at an angular frequency of 6.28 rad∙s- 1 and a strain hardening parameter H of 1.5 or more.

Provided is a film adhesive that contains a thermosetting resin component and an elastomer and may also contain an inorganic filler. The inorganic filler content is 0–5 mass% of the total mass of the film adhesive. The shear viscosity at 120°C is no more than 10000 Pa⋅s.

According to the liquid embolism material and the preparation method thereof disclosed by the invention, a traditional thickening agent is omitted, and the prepared liquid embolism material has better flowability in a high-shear state by adjusting the specific types and dosage proportions of a developing agent and a thixotropic agent, and is convenient to convey to a farther end of a blood vessel; and meanwhile, under a low-shear state, high shear viscosity and modulus are presented, the performance requirement of embolism stability is met, and the immunogenicity risk and the limitation of a sterilization mode caused by a traditional thickener gelatin can be avoided.

A polymeric composition includes 60 wt% to 85 wt% of a first ethylene-based polymer, wherein the first ethylene-based polymer has a density of 0.93 g / cc to 0.97 g / cc as measured according to ASTM D792 and has a polydispersity index of 7 or greater as measured according to Gel Permeation Chromatography and has a shear viscosity v100 of 800 Pa. s or greater at 170℃ as measured according to dynamic mechanical spectroscopy; 15 wt% to 40 wt% of a second ethylene-based polymer, wherein the second ethylene-based polymer has a density of 0.916 g / cc to 0.930 g / cc as measured according to ASTM D792 and has a shear viscosity v100 of 800 Pa. s or greater at 170℃ as measured according to Dynamic Mechanical Spectroscopy; and 0.1 wt% to 2.0 wt% of a foaming agent based on the total weight of the polymeric composition.

This invention discloses a method for preparing two-dimensional composite materials and their composite films with low energy consumption using surface anchoring effect. The preparation method of the two-dimensional composite material of this invention includes the following steps: S1, dissolving a surface anchoring agent in a polar solvent to obtain an agent solution; the surface anchoring structure of the surface anchoring agent includes one or more of amino, ammonium salt, carbonyl, carboxyl, ester, and hydroxyl groups; the molecular weight of the agent is ≤3 million; the viscosity of the agent solution at 25°C is 800-10000 mPa·s, and the zero-shear viscosity is 100-1000 s. ‑1 The viscosity ratio at high shear rates is ≤10; S2, the layered two-dimensional matrix powder is mixed with the additive solution to obtain a suspension; S3, mechanical force is applied to the suspension for assisted exfoliation to obtain a two-dimensional composite material containing two-dimensional materials and surface anchoring additives. This invention maximizes the use of input mechanical force to achieve low-energy preparation of large-size, thin, and highly functionalized two-dimensional materials, which can be directly processed into high-performance thin films.

The present application relates to gas absorption and resource utilization technical field, especially to a kind of dual regulation method for improving liquid-solid phase change CO2 absorbent trapping performance, the method introduces two kinds of functional regulators to synergistically optimize absorbent performance, the first kind of regulator is used to improve solvent environment, reduce the viscosity at the beginning of absorption, improve mass transfer efficiency;The second kind of regulator is used to delay liquid-solid phase change start, enhance CO2 enrichment capacity.On this basis, regression type machine learning model is constructed, with CO2 total absorption load, shear viscosity and system volume change as optimization target, realize the intelligent prediction and optimization design of regulation scheme.The method proposed in the present application can make CO2 total absorption load can be increased by ≥10%, the shear viscosity of absorption product is reduced by ≥50%, liquid-solid phase change start time is delayed by ≥10 min, which provides effective technical path and optimization strategy for performance regulation and industrial application of liquid-solid phase change absorbent system.