46 results about "Shear rate" patented technology

The present invention provides a sealing sheet for solar cell modules that offers a desirable level of molding properties, heat resistance, and effectively suppresses defects during hot press processing. [Solution] A encapsulating sheet for solar cell modules, with a polyolefin resin as the base resin, a melting point of 55°C to 120°C, a temperature difference of 20°C or less between the extracellular melting initiation temperature and the melting point, and a shear rate of 2.43 × 10 sec measured at 190°C. -1 The solar cell module comprises a sealing sheet having a melt viscosity of 1000 Pa·s or more and 4000 Pa·s or less, preferably with a gel fraction of 10% or less, and at least one of the front sealing layer and the back sealing layer being composed of the sealing sheet.

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 application provides a devolatilization process for PC and ABS alloy materials, comprising: obtaining the initial processing temperature, preset shear rate, and initial residence time of the melt in a devolatilization device; calculating the estimated adhesion thickness and theoretical surface renewal rate of the melt on the inner wall of the device based on the initial processing temperature and the preset shear rate; if the theoretical surface renewal rate is lower than a preset threshold, adjusting the geometric parameters of the devolatilization device cavity to enhance melt flow; determining the melt residence time window based on the optimized parameters and the initial processing temperature; if the initial processing temperature is higher than a preset threshold, introducing an auxiliary medium to promote volatile migration; obtaining the final volatile concentration and material performance data, comparing them with preset indicators, and determining the compliance of the process parameters.

The present invention relates to a dispersion comprising i) a dispersant; ii) at least one polythiophene dispersed in the dispersant i); and the Ostwald de l / l / ae / e relationship for the dispersion. T =Ky n The exponent n in the power law is in the range of 0.62 to 0.92. T The present invention relates to a dispersion in which is the shear stress, K is the fluid viscosity constant, Y is the shear rate dy / dt, and the dispersion has a solid content of at least 1.5% by weight based on the total weight of the dispersion. The present invention also relates to a process for preparing a dispersion, a dispersion obtained by the process, a process for preparing a laminate, a laminate obtained by the process, and the use of the dispersion for forming a solid electrolyte layer in a capacitor.

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.

A soft magnetic resin composition includes a solid content containing flat soft magnetic particles and a resin component, and a dispersion medium. Furthermore, a viscosity (A) at a shear rate of 38.1 s-1 is 300 mPa·s or more. Furthermore, a ratio (A / C) of the viscosity (A) at a shear rate of 38.1 s-1 with respect to a viscosity (C) at a shear rate of 191.5 s-1 is 1.7 or more.

Disclosed herein is a conversion composition comprising a yield stress component and a corrosion inhibitor, wherein the conversion composition comprises a yield stress sufficient to overcome the effect of gravity when applied to a non-horizontal surface. The conversion composition may comprise a yield stress of at least 0.6 Pa at a frequency of 1 Hz and a temperature of 25° C. when the composition is applied to a substantially vertical substrate surface at a thickness of 0.5 mil to 40 mil, may comprise a viscosity of less than less than 700 mPa·s. at a shear rate of 100 reciprocal seconds at a temperature of 25° C. a viscosity of less than 200 mPa·s. at a shear rate of 1000 reciprocal seconds at a temperature of 25° C. or combinations thereof. Also disclosed are substrates comprising a film formed from the conversion composition. Also disclosed are systems and methods comprising the conversion composition and substrates formed therefrom.

An ink set including two types of inkjet inks having different thixotropic indices calculated by the following formula: thixotropic index=[Viscosity of inkjet ink measured at 23° C. and at a shear rate of 53.6 s−1] / [Viscosity of inkjet ink measured at 23° C. and at a shear rate of 1000 s−1], wherein the two types of inks each include a colorant, a dispersant, and an organic solvent; a ratio of a thixotropic index of an ink (B) (TB) having a higher thixotropic index to a thixotropic index of an ink (A) (TA) having a lower thixotropic index [(TB) / (TA)] is 1.04 or more; and the ink (B) is applied to a print medium to be overlayed on at least a part of an application region of the ink (A) after applying the ink (A) to the print medium.

This invention discloses a multi-dimensional blending method for heating lubricating oil. The method first initializes data such as the viscosity-temperature characteristic curve of the base oil, the dissolution activation energy of additives, and the thermal degradation threshold. Then, it constructs a multi-dimensional coupled model encompassing temperature, rheology, and time dimensions. The main heating unit maintains the base oil's basic flow temperature and performs low-speed pre-blending. During additive injection, an auxiliary heating unit rapidly heats the local fluid at the instantaneous optimal dissolution temperature calculated by the model. Apparent viscosity is calculated based on mixing torque feedback. Shear rate and heating power are dynamically adjusted according to the blending efficiency function. The blending endpoint is determined using a "viscosity-energy consumption" feedback loop, and parameters are optimized through an adaptive learning module. This method achieves efficient dispersion, energy saving, low thermal damage, and improves product mixing uniformity and batch quality stability.

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 the field of polymer processing, and discloses a polymer sag resistance evaluation method and apparatus, a storage medium, and a processor. The method comprises: simulating an extrusion molding process of a polymer to obtain temperature field distribution and shear rate distribution of the polymer in the extrusion molding process; determining viscosity data of the polymer under the temperature field distribution and the shear rate distribution, and determining storage modulus data of the polymer under the temperature field distribution; and on the basis of the viscosity data and the storage modulus data, evaluating the sag resistance of the polymer. In the present solution, the viscosity and storage modulus which have a stronger correlation with the sag resistance of the polymer are used as physical parameters for evaluating the sag resistance of the polymer, and testing is performed under actual extrusion conditions, so that the performance of the polymer in a real processing environment can be reflected, and the sag resistance of the polymer in an actual extrusion process can be more accurately evaluated.

The application discloses a tailgate sound quality control method, and relates to the technical field of automobile engineering, and comprises the following steps: transmitting the stress state of the tailgate during closing and driving, so that the tailgate and the buffer structure generate corresponding shear rate action conditions, and the action conditions correspond to different motion conditions; driving the shear thickening liquid filled in the buffer structure to generate rheological response under the action conditions, and the shear thickening liquid keeps a low viscosity flow state under a low shear rate condition and outputs a low stiffness buffer characteristic. The shear thickening liquid presents low stiffness under a low shear rate, the flexible buffer during slow closing of the tailgate is realized, the impact is reduced, and the sound quality is optimized; the shear thickening liquid thickens rapidly under a high shear rate, the stiffness support is improved, the tailgate dynamic displacement and collision under a bumping condition are inhibited, so that abnormal sound is effectively reduced, and the overall stability and use experience are improved.

A device and method for measuring rheological properties of a magneto-rheological fluid based on reciprocating shear flow, comprising a sealed cavity, a driving part, a shear stress measuring part and a magnetic field generating part arranged in the sealed cavity; the driving part comprises a motor, the motor drives the synchronous movement of two groups of piston rods through a ball screw mechanism, and the two piston rods are arranged opposite to each other; the shear stress measuring part comprises a flow channel, the flow channel is connected with a connecting cylinder at both ends, the piston rods extend into the connecting cylinder, and the flow channel is filled with a magneto-rheological fluid; the magnetic field generating part comprises an iron core, an excitation coil and a current source, the shape of the iron core is adapted to the flow channel, the excitation coil is sleeved outside the iron core, and the current source is connected with the excitation coil. The device and method for measuring rheological properties of a magneto-rheological fluid based on reciprocating shear flow provided by the application expand the detection range of shear rate, increase the multi-field synergistic regulation of temperature field and magnetic field, and improve the measurement accuracy.

The utility model relates to the technical field of stirring equipment, concretely to a kind of anti-condensation stirring equipment for glass cement production, including bottom plate and the moving plate being set on the top of bottom plate, the outside of bottom plate is provided with the moving assembly of making moving plate go up and down linearly moves. The utility model can make the reciprocating of stirring shaft up and down, to realize the stirring of vertical direction, while stirring shaft is in the process of rotating and up and down linear reciprocating motion, stirring blade is constantly in the process of expansion and contraction motion, this reciprocating expansion and contraction motion is superimposed on the rotation of stirring shaft, can increase the shear rate and turbulence intensity of fluid;Periodic expansion and contraction changes flow field structure, possibly breaks laminar boundary layer, promotes microcosmic mixing, expansion and contraction motion generates unsteady flow, triggers secondary flow or vortex, expands stirring action range, reduces mixing dead zone, to improve stirring efficiency, also improve anti-condensation effect.

The invention relates to a cementitious paste for fixing tiles having a dimension of at least 60 cm or more on a substrate, said cementitious paste comprising a hydraulic binder, aggregates, the overall bulk density of said aggregates being 500 kg / m3 or less, a first rheology modifier, a second rheology modifier which is also a water retention agent, a film-forming polymer, and water, wherein the cementitious paste has a yield stress of 50 to 200 Pa and a hysteresis surface of 6,000 to 12,000 Pa.s-1, wherein the hysteresis surface is the area between the rising and falling curves of a shear stress-as-shear-rate plot generated from a Brookfield viscometer loop test.

This invention relates to the field of industrial control system technology, specifically to an adaptive control method for eye drop processing equipment based on digital twins. The method includes acquiring the transient pressure decay sequence of the eye drop filling pipeline, the braking displacement sequence of the filling pump rotor, and real-time temperature data; extracting the rheological relaxation time constant based on the pressure sequence, analyzing the transient shear rate matrix inside the pipeline based on the displacement sequence, and determining the dynamic viscosity reference parameter based on the temperature data; inputting the above parameters into a digital twin model, mapping and outputting the dynamic evolution time sequence of the first normal stress difference, thereby predicting the liquid bridge fracture time and analyzing the residual normal tensile stress at the needle tip; analyzing the reverse suction momentum compensation parameter based on the residual normal tensile stress and the predicted fracture time, generating an asymmetric suction control pulse sequence, and finally converting it into servo drive commands and sending them to the control unit. This invention achieves adaptive control through digital twin modeling.

An aqueous coating composition includes water; a crosslinker; and a resin dispersion comprising a latex, a polyurethane, or combinations thereof. Specifically, the composition is free of a thickener and exhibits a viscosity of less than or equal to about 100 cP, measured at a shear rate of from about 0.1 s−1 to about 10 s−1. Furthermore, the composition is sag-free, determined by a 90-degree tilt test, when applied to and in direct contact with a partially dried coating substrate having a solids content of greater than about 80 wt %, based on a total weight of the coating substrate.

The application discloses polylactic acid and a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polylactic acid has specific optical purity, a molecular weight distribution index PDI and a shear viscosity at 190 DEG C and a shear rate of 50 s ‑1 -1, and has good heat sealing performance and mechanical properties, and is suitable for preparing film bag products.

The application discloses a solid propellant slurry mixing rheological safety simulation method and system, and belongs to the technical field of solid propellant mixing process safety simulation. In view of the problems that the existing method is difficult to accurately capture the dynamic change of the rheological property of the slurry in the mixing process, the load evaluation of the key area is insufficient, and the safety judgment is lacking, the application establishes a functional relationship between the rheological parameters and the solid content, and calculates the critical solid volume fraction based on the particle layer paving structure assumption; a parameterized three-dimensional model of the mixing machine is constructed, a mixing flow field simulation model is established by using the finite element method, the rheological parameter model is embedded in the simulation through the user-defined function, the pressure field, the shear stress field and the shear rate field under different solid contents are simulated; the load data of the kneading area and the wall scraping area are extracted, and the dangerous working condition recognition and early warning are carried out in combination with the double criteria of the load safety threshold and the critical solid content. The application is used for safety evaluation of the solid propellant mixing process, and realizes the early identification and early warning of the dangerous working condition.

To obtain a recycled polyester film with high edge tear resistance. [Solution] A recycled polyester film having an intrinsic viscosity IV of 0.55 dl / g or more and 0.65 dl / g or less, a rheometer viscosity ηH of the film at 280°C and a shear rate of 31.4 rad / s of 100 Pa·s or more and 250 Pa·s or less, and a Tmeta of the film observed by differential scanning calorimetry (DSC) of 195°C or more and 235°C or less.

The utility model discloses a multifunctional rheological testing device, including U type material cylinder, plunger and rotor subassembly, U type material cylinder includes two vertical sections and the curved section of connecting two vertical sections, plunger is adapted with the vertical section of U type material cylinder and can move along the vertical section inner wall of U type material cylinder axial movement, is used for extruding the material in this vertical section, rotor subassembly sets up in another vertical section of U type material cylinder, and rotor subassembly includes the main rotor of the intermediate position and first auxiliary rotor and second auxiliary rotor respectively located main rotor upper and lower both ends, main rotor, first auxiliary rotor and second auxiliary rotor and the vertical section inner wall of U type material cylinder form annular slit type die mouth, and material can flow through the annular slit under the extrusion of plunger, the utility model solves the problem of traditional rheological test in loading and unloading sample time -consuming, edge effect is serious, and the single measurement mode, the viscoelasticity test difficult problem under high shear rate.

The application belongs to the technical field of vehicle collision safety protection, and particularly relates to a self-adaptive hierarchical anti-collision energy-absorbing device based on a shear thickening fluid, which comprises a fixed base with a sliding groove extending in an axial direction inside the fixed base; an anti-collision sliding rod partially and slidingly arranged in the sliding groove, and having a first end exposed outside and a second end in the sliding groove; and a flexible sealing bag arranged between the bottom wall of the sliding groove and the second end of the anti-collision sliding rod, and filled with a non-Newtonian fluid in the inside of the flexible sealing bag, wherein the non-Newtonian fluid is in a flow state at a low shear rate, and is hardened by shear thickening when the shear rate exceeds a critical shear rate. The self-adaptive separation of low-speed flexible energy absorption and high-speed rigid locking is realized in a single device, that is, a large stroke deformation energy consumption is provided by the flexible sealing bag squeezed into the groove at a low speed, and rigid support is provided by the non-Newtonian fluid hardened and interlocked with the groove at a high speed.

The application is a method and system for constructing a wide-temperature-range constitutive model of a viscoelastic fluid in a space environment, which relates to the cross-technical field of computational materials science, aerospace tribology and fluid dynamics, and comprises the following steps: performing sinusoidal shearing on a balanced full-atom model at multiple key temperature points, simulating the dynamic response under sinusoidal shearing to obtain original strain time series data and original stress time series data, performing filtering and smoothing processing and feature extraction to obtain waveform features, and calculating shear rate time series data; inputting the filtered and smoothed original strain time series data and the shear rate time series data into a constitutive mathematical model to obtain predicted stress, minimizing the error between the predicted stress and the filtered and smoothed original stress time series data for multi-stage optimization, and obtaining a wide-temperature-range constitutive model of a viscoelastic fluid. The application solves the technical problem that the constitutive model is difficult to obtain rheological parameters of a space lubricating fluid under wide-temperature-range and large-amplitude shearing, resulting in low prediction accuracy.

The application discloses a kind of polymer rheological property prediction method and system based on global optimization, to solve the problems that traditional rheological data exists apparent physical deviation, engineering constitutive parameter step fitting is easy to fall into local optimum and microstructure feature is difficult to quantify.The method first obtains the apparent data of polymer in multiple temperature zones steady shearing and dynamic oscillation;Then, based on Rabinowitsch equation, polynomial differential correction is carried out, and the deviation of pipe wall velocity distribution is eliminated to extract the real physical viscosity;Subsequently, a Cross-WLF three-dimensional space model containing temperature and shear rate is constructed, and Levenberg-Marquardt algorithm is used to perform global nonlinear iterative optimization, and the kinetic and thermodynamic constants are extracted in one step;At the same time, dynamic modulus data is introduced to perform Cox-Merz rule self-consistency verification, and a multi-dimensional diagnostic atlas matrix is constructed.The application breaks the limitation of traditional single-temperature zone fitting, and realizes the automatic extraction of high-precision mold flow simulation parameters and the accurate diagnosis of material microphase separation.

This invention relates to a modified ethylene-vinyl acetate copolymer material and a method for preparing its EVA film. The material uses ethylene-vinyl acetate copolymer as the continuous phase, introduces high-density polyethylene and linear low-density polyethylene to construct a composite structure, and achieves interphase connection through polar grafted polyethylene. Simultaneously, it incorporates orientation-controlled fillers with specific aspect ratios to form a multi-level synergistic system. During processing, the intermediate structure formed in the system is rapidly fixed through the coordinated control of process parameters such as shear rate, shear time, rapid cooling under negative pressure, and directional traction, resulting in a non-uniform orientation distribution along the film thickness direction. By establishing the relationship between shear strength, polar component dosage, and filler dosage, continuous transmission of structural evolution is achieved. The resulting EVA film exhibits good stability in terms of crystallization behavior, heat-sealing performance, and mechanical properties, featuring high heat-sealing strength, a wide heat-sealing window, and good structural continuity, making it suitable for the packaging industry.

This invention proposes a copper paste, wherein the copper paste is heated at 20-25°C for 200-500 seconds. ‑1 The shear viscosity at the shear rate is 0.1–10 Pa·s. Therefore, this application provides a copper paste that has high storage stability before printing, and at the same time, can reduce viscosity and improve paste flowability under high shear rates during printing, exhibiting stable and excellent continuous printability, thereby providing a high-quality, low-resistance copper electrode.

Provided is a resin laminate having at least one layer containing a polycarbonate resin (A) and another layer containing a thermoplastic resin (B) on the surface of the layer containing the polycarbonate resin (A), wherein the viscosity of the polycarbonate resin (A) is 3,700 to 15,000 [Pa・S] at a shear rate of 6.080 x 10[1 / S] measured at 260°C, and the thermoplastic resin (B) contains a styrene copolymer (C).

The application discloses a kind of lubricating material intelligent production regulation and control system and method, belong to chemical intelligent manufacturing technical field.The method is by real-time acquisition reaction system double-waveband original spectrum data, extract the spectrum difference fingerprint vector of evolution of intermolecular force;It is inputed into reaction kinetics deviation model, calculates instantaneous kinetic deviation and generates temperature-time compensation factor and shear rate correction coefficient;Accordingly, dynamically reconstructs the heating curve, adjusts stirring power to lock the reaction endpoint, and triggers additive pulse addition when the convergence slope of fingerprint vector deviates from the safety envelope;Finally, write the whole process time sequence data into distributed account book solidification and evidence.This application realizes the reaction process feedforward accurate regulation based on molecular microstate, effectively improves product consistency, and ensures the non-tamperability and traceability of production data through block chain evidence.

To obtain a recycled polyester film that is easy to tear by hand. [Solution] A recycled polyester film having an intrinsic viscosity IV of 0.55 dl / g or more and 0.65 dl / g or less, a rheometer viscosity ηH (Pa·s) of 120 or less at 280°C and a shear rate of 31.4 rad / s, and a Tmeta observed by differential scanning calorimetry (DSC) of 220°C or higher.

The present invention relates to an organic solvent-based retroreflective ink, paint or coating composition having a first Brookfield viscosity η1 at a shear rate of 0.5 rpm of between 0.2 and 8 Pa s, and a second Brookfield viscosity η2 at a shear rate of 20 rpm of between 80 and 450 mPa s, with the proviso that η2 is at least 2 times lower than η1, wherein the organic solvent-based retroreflective ink, paint or coating composition consists of: • 25-75 wt% of an organic solvent; • 1-85 wt% of spherical glass beads; • 0.15-1.2 wt% of a thickening agent; and • 0-30 wt% of one or more other ingredients; wherein the Brookfield viscosities η1 and η2 are measured at a temperature of 25°C in a 600 ml beaker with a diameter of 8.25 cm using a #2 spindle.