300 results about "Shear rate" patented technology

To provide a metal paste capable of efficiently providing a joined body having reliability high in electrical and mechanical strength even when narrowed in pitch, and to provide a method for manufacturing the joined body.SOLUTION: A metal paste comprises metal particles and a solvent, and has a shear viscosity of 1 to 100 Pa_s, measured at a shear rate of 10 s-1 at 25°C, wherein a value (TI value) obtained by log-transforming a ratio of a shear viscosity measured at a shear rate of 0.1 s-1 and a shear viscosity measured at a shear rate of 1 s-1 is 0.7 to 1.0.SELECTED DRAWING: Figure 4

The invention relates to the technical field of high-performance polymer material processing, in particular to a high-strength and high-modulus polyethylene fiber spinneret plate forming system and method.The system comprises a melt state monitoring module, a dynamic rheological coordination module, a micro-flow field reconstruction module, a molecular chain orientation module and an extrusion stabilization module; wherein the melt state monitoring module is used for acquiring an orientation degree real-time value and a pressure fluctuation value of a melt at an inlet of a spinneret plate; the dynamic rheological coordination module is used for generating a shear rate adjusting instruction and a pressure compensation instruction; the micro-flow field reconstruction module responds to the instruction and outputs a melt meeting a preset shear distribution condition; and the molecular chain orientation module is used for generating an axial stretching flow field in the convergence flow channel. According to the invention, through a melt state driven multistage flow field regulation and control and chain segment orientation control mechanism, the cooperative guarantee of orientation degree improvement and extrusion stability in the high-strength and high-modulus polyethylene fiber spinning process is realized.

The invention belongs to the technical field of spraying, and discloses a full-automatic spraying production line control method and system, and the method comprises the steps: obtaining real-time rheological property data of a coating; the real-time rheological characteristic data comprises an apparent viscosity curve representing that the apparent viscosity of the coating changes along with the shear rate, and local geometric characteristic information of a local area where a current spraying point of the to-be-sprayed workpiece is located is obtained; according to the local geometric feature information, determining a target shearing rate range corresponding to a local area where the current spraying point is located; according to the real-time rheological characteristic data and the target shearing rate range, spraying parameters are obtained through calculation; according to the spraying parameters, spraying equipment of the full-automatic spraying production line is controlled to conduct spraying operation; therefore, the spraying parameters can be dynamically adjusted according to the real-time rheological characteristics of the coating and the local geometrical characteristics of the workpiece, and the spraying quality is improved.

The invention discloses a digital light processing printing control method based on temperature control microsphere bio-ink. Comprising the following steps: firstly, constructing a constitutive model of the three-phase conversion bio-ink according to melting conditions of dispersed phase microspheres in the three-phase conversion bio-ink at different printing temperatures and steady-state shear stress-shear rate curves at different printing temperatures; fitting is carried out by using the constitutive model and data in the steady-state shear stress-shear rate curve at different printing temperatures, and reconstruction coefficients and first damage coefficients corresponding to different printing temperatures are obtained; and finally, whether the three-phase conversion bio-ink has the forming capacity of the dynamic support bath at different printing temperatures or not is determined, so that the proper printing temperature is determined, and DLP printing is carried out. Proper bio-ink can be prepared according to actual bio-printing requirements, the optimal printing temperature is obtained, and accurate control over printing conditions is achieved.

The invention discloses a shear thickening fluid and gradient negative Poisson's ratio metamaterial composite impact-resistant energy-absorbing structure, which comprises an upper high-strength aluminum alloy plate, a lower high-strength aluminum alloy plate and a middle multi-layer gradient honeycomb core, the honeycomb core adopts a single reentrant hexagonal structure, and concave angles of each layer are gradually increased layer by layer to realize graded absorption and uniform dispersion of impact energy. The honeycomb units are filled with the shear thickening fluid, the shear thickening fluid is rapidly tackified at a high shear rate in the compression deformation process of the negative Poisson's ratio honeycomb core, and the energy dissipation performance of the composite protection structure is improved through cooperative energy absorption of the gradient negative Poisson's ratio honeycomb structure and the shear thickening dynamic thickening effect. All the layers are tightly connected through a high-strength interface bonding technology, and the overall structure is stable and durable. According to the invention, impact energy transfer is effectively blocked, light weight, simple process and cost optimization are taken into consideration, and the method is suitable for high-impact scenes such as aviation, automobiles and buildings, and has wide market prospects and application values.

The invention discloses a processing method of a polybutylene terephthalate bar with laser etching performance, and relates to the technical field of high polymer material processing and surface modification.The processing method comprises the following steps that in the material melting stage, a synchronous observation system of a melt rheological behavior and a temperature field is established, micro-amplitude sine torque disturbance is introduced, and the temperature field is measured; obtaining dynamic response of viscosity and shear rate, and generating a flowing fingerprint baseline; and performing spectrum decomposition on the flow fingerprint baseline, extracting signal components causing pressure pulsation, determining a critical shear rate threshold and time delay thereof, and forming a discrimination condition of an unstable region. According to the method, shear characteristics are extracted through rheological disturbance and thermal field synchronous observation, space mask driving process simulation is constructed, a feedforward adjusting curve is output, density online estimation and phase recognition are introduced, micro-pulse disturbance and temperature fine adjustment are combined, closed-loop control is formed, melt flow is dynamically stabilized, and laser engraving consistency and the product yield are improved.

The invention relates to the technical field of polyolefin materials, in particular to an ethylene and alpha-olefin copolymer and a preparation method thereof. The density of the ethylene and alpha olefin copolymer is 0.860-0.905 g / cm < 3 >, the weight-average molecular weight Mw is greater than 50000 g / mol, the rheological processing parameter STP value of the ethylene and alpha olefin copolymer is in the range of 2.20-3.93, and the STP value is calculated by a specific formula according to the complex viscosity and the weight-average molecular weight of the polymer at different shear rates. According to the copolymer provided by the invention, by combining the structural parameters, the melt strength and the processability of the copolymer are remarkably improved on the premise of not sacrificing the inherent mechanical properties of the material, and the processing window and the application range of the material are effectively widened.

The invention discloses a construction method of a thixodynamic rheological model of superfine tailing paste, and belongs to the technical field of metal mine paste filling, the method comprises the following steps: firstly, constructing a structural kinetic equation that the internal structural coefficient of the superfine tailing paste dynamically evolves along with the shearing rate and the shearing time; secondly, constructing a state equation for associating the structure coefficient with the macroscopic rheological parameters of the paste; finally, the equations are coupled, a thixodynamic rheological model containing seven parameters representing the dynamic damage and recovery process of the internal structure of the paste is obtained, and the model parameters can be calibrated by fitting a paste thixotropic rheological characteristic curve. The applicability of the model is verified under different conditions, and a time-varying paste pipeline conveying resistance calculation model is further established. The method effectively solves the problem that the traditional rheological model is difficult to describe the thixotropic rheological characteristics of the paste, and the constructed model provides theoretical basis and data support for optimizing pipeline transportation design and reducing the energy consumption of a filling system.

The invention provides a real-time lubrication control method and device for a gear transmission system. The method comprises the steps that multi-dimensional collection is conducted on operation state parameters of a gear pair, and a working condition state data set is generated; determining shear rate distribution data and oil film thickness distribution data of the lubrication contact area according to the working condition state data set; inputting the obtained data into a neural network model, and performing joint prediction on the oil film rigidity and the tooth surface friction coefficient of the lubrication contact area to generate a joint prediction result; according to the joint prediction result, whether the gear pair lubrication strategy meets the safe operation requirement or not is judged, and a corresponding lubrication level is generated; and performing differential treatment on the oil film rigidity and the tooth surface friction coefficient according to the lubrication grade, determining a lubrication offset parameter, and performing self-adaptive adjustment on the lubrication control parameter according to the lubrication offset parameter. According to the scheme, the lubrication parameters are adjusted in time according to the joint prediction result, and precise adjustment and optimization of the gear lubrication state under the high-load and high-speed working condition are achieved.

The invention discloses an accurate temperature control method and system for regeneration and recovery of injection molding products, and relates to the field of temperature control. The method comprises the following steps: analyzing regenerated plastic components in real time through a near-infrared spectrometer, and obtaining a melt index, a thermal stability parameter and a glass transition temperature; establishing a melt apparent viscosity-temperature-shear rate three-dimensional response curved surface model in combination with a rheology theory; the method comprises the following steps: acquiring temperature gradient and pressure data by utilizing a multi-sensor network deployed in each module of a double-screw extruder, calculating an actual shear rate and melt apparent viscosity, and comparing the actual shear rate and melt apparent viscosity with theoretical values to trigger a PID (Proportion Integration Differentiation) neural network to predict temperature fluctuation so as to carry out differential temperature compensation on a feeding section and a melting section; and after each batch of production, model parameters are optimized by adopting a least square method, so that closed-loop intelligent regulation and control in the processing process of the regenerated plastic are realized. The method has the advantages that through the three-dimensional model, the PID neural network differential temperature control is combined, the temperature control problem of the regenerated plastic is solved, the quality stability of products is improved, and the waste rate is reduced.

The invention relates to the technical field of verification optimization, in particular to a color master batch extrusion molding defect prediction method and system based on a rheological model. Comprising the following steps: carrying out rheology test to obtain rheology test data; performing parameter fitting on the rheology model based on the rheology test data to obtain a rheology prediction model; obtaining a solution flow, an extrusion temperature and geometric parameters of the mold; carrying out fluid mechanics calculation to obtain a wall surface shearing rate at the outlet of the mold; inputting the wall surface shear rate into the rheology prediction model to obtain wall surface shear stress; monitoring the processing process to obtain multi-source data; performing time alignment on the wall surface shearing rate, the wall surface shearing stress and multi-source data to obtain a processing time sequence; and performing analysis and prediction based on the processing time sequence to obtain roughness early warning parameters. According to the method, prediction and early warning of the surface roughness are realized through the rheological model.

Disclosed is a fluorine-based resin film which has a melt viscosity η of 600 Pa∙s to 4,000 Pa∙s inclusive as measured at a measurement temperature of 260°C and a measurement shear rate of 50 s-1. The fluorine-based resin film has a surface roughness height Rz of 0.50 μm or less as measured in accordance with JIS B 0601 (2001), and the number of foreign substances having a size of 100 μm or more is 7 per 0.25 m2 or less, the size being the arithmetic average value of the maximum width and the minimum width when the film is viewed in plan.

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 relates to the field of coating performance testing technology, and more particularly to a testing method and evaluation system for the leveling and sagging properties of coatings. The coating is taken as a sample and tested in a rheometer: shear forces of a first low shear rate, a high shear rate, and a second low shear rate are sequentially applied to the coating, and the viscosity value of the coating over time is measured to obtain a shear rate-viscosity data curve; the recovery index RI is obtained from this curve; the viscosity value corresponding to 1 / n of the total time required from the start of the second low shear rate treatment to viscosity stabilization is obtained from the shear rate-viscosity data curve, and the viscosity value at the first low shear rate is calculated, and the ratio is used to obtain the stage recovery index RI. 1 / n The method of this invention can simultaneously measure the shear rate-viscosity data curves of multiple coatings, and can quickly and qualitatively evaluate the leveling and sagging properties of coatings at different thicknesses.

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.

Provided is a film including a polycarbonate resin capable of achieving excellent drawdown resistance during thermoforming and excellent formability in processing a bent portion and the like thereof. The film contains a polycarbonate resin (a) which satisfies the following expression (i), when a viscosity at a shear rate of 6.080×10 [1 / s] measured at 300° C. is X [Pa·s] and a viscosity at a shear rate of 6.080×103 [1 / s] measured at 300° C. is Y [Pa·s].-0.69<logY-logX2<-0.41(i)

The invention discloses a fluid vacuum cooling method based on critical shear rate control. The fluid vacuum cooling method comprises the following steps: placing a fluid material in a rotationally symmetrical vacuum cavity with a material container; establishing a vacuum environment, and enabling the ultimate vacuum pressure in the vacuum cavity to be lower than the saturated vapor pressure corresponding to the target cooling temperature; stirring the fluid material to form a water directional migration channel pointing to the surface from the interior of the material; the stirring shear rate gamma is controlled to be larger than or equal to the critical shear rate gamma crit, a pressure shell layer in fluid is destroyed, an evaporation area is transferred to the surface from the interior of a material, and splashing is fundamentally restrained; and meanwhile, centrifugal backflow of splashing liquid drops is realized by adopting a rotary symmetrical vacuum cavity. Therefore, the splashing of fluid vacuum cooling is greatly reduced, the vacuum cooling time is shortened, and the cooling efficiency is greatly improved.

The invention discloses a method for improving the enhancement performance of a polypropylene mineral filler for a flow battery pole frame, and particularly relates to the technical field of material processing quality control, and the method comprises the following steps: constructing a processing dynamic characteristic data set by collecting processing heat flow parameters, shear rate fluctuation values and interface energy change data in real time; under the condition that the heat flow stability and the shear stress consistency meet the condition, abnormal behavior segments are identified to form candidate analysis areas; further extracting two indexes of dynamic distribution stability and interface activation coherence, and inputting the two indexes into the prediction model to generate an enhanced fitness coefficient; according to the coefficient matching optimization path, target-oriented behavior reconstruction of the machining scheme is achieved; according to the method, the machining dynamic data are collected, the double-index representation model is constructed, and the prediction mechanism is introduced, so that the precise recognition and quantitative evaluation of the machining behavior are realized, the predefined machining scheme is matched in combination with the adaptation degree coefficient, a path optimization closed loop under data driving is formed, and the machining stability and the control precision are improved.

Writing, makeup and / or painting system (10) comprising a preparation with fibrous and / or thixotropic properties and an application device (1) for the preparation, wherein the application device (1) comprises: - a storage container (2) for storing the preparation - an application element (3) for applying the preparation onto a substrate - a conveying element (4) connecting the order element (3) and the storage container (2) - a pump and shear element (5) arranged at least partially in a cavity of the conveying element (4), which is at least partially reversibly movable into the storage reservoir (2) in the longitudinal direction (L) of the application device (1) between the application element (3) and the storage reservoir (2). - a conveying gap (6) formed between an inner surface (12) of the conveying element (4) and an outer surface (11) of the pump and shear element (5) for conveying the preparation from the storage reservoir (2) to the application element (3), wherein the pump and shear element (5) is configured to exert a shear force on the preparation in the conveying gap (6) by moving the pump and shear element (5) in the longitudinal direction (L) of the application device (1) at a temperature of 25 °C with a shear rate in the range of 10 / s to 10000 / s.

The invention relates to an overmolded composite structure. The invention relates to a composite material comprising: i) a first component (C1) comprising at least one fibrous material and a matrix resin component comprising at least one polyamide having a number average molecular weight Mn between 3,000 and 35,000 g / mol, preferably between 5,000 and 20,000 g / mol, preferably between 5,000 and 15,000 g / mol, preferably between 5,000 and 10,000 g / mol, and i) a second component (C1) comprising at least one fibrous material and a matrix resin component comprising at least one polyamide having a number average molecular weight Mn between 3,000 and 35,000 g / mol, preferably between 5,000 and 10,000 g / mol; and a melt viscosity, measured in capillary rheology, of between 0.05 and 1000 Pa.s, preferably between 0.1 and 1000 Pa.s, preferably between 0.3 and 1000 Pa.s, preferably between 0.3 and 500 Pa.s, more preferably between 0.3 and 250 Pa.s, e.g. Between 0.3 and 100 Pa.s, even more preferably between 0.3 and 50 Pa.s, more preferably between 0.3 and 25 Pa.s, measured at a shear rate of 1800 s-1 at Tf + 50 DEG C (Tf is the melting temperature of the at least one polyamide), even more preferably between 0.3 and 10 Pa.s, preferably between 0.3 and 5 Pa.s; and ii) a second component (C2) comprising an overmolded resin component, the first component C1 having at least one surface S, and the component C2 being adhered to the component C1 over at least a portion of the surface S.

The invention concerns a printable composition comprising: i) at least 18 wt.% photo polymerization reactive compound (M) provided by a secondary acryl amide of the structure type H2C=CH-CO-NH-R1, with R1 represented by an organic residue, ii) photo polymerization reactive organic compound (N) which is different from (M) with the proviso that: all species of the reactive organic compound (N) have a viscosity of maximum 50 mPa s at 25 °C (measured according to DIN EN ISO 3219-2, August 2021, with the proviso that: use of rotational rheometer in cone-plate geometry: cone diameter 60 mm, zero-gap distance 0.061 mm, cone angle 0.5 °; use of active thermal cover and heat plate; use of shear-rate of 600 s-1; general temperature measurement range 25-70 °C) and iii) radical photo initiator (R), where the wt.% ratio of contained (N) to contained (M) is at least 1.3 and the wt.% is relative to the total weight of the 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.

To provide a positive electrode composition that enables the production of lithium-ion secondary batteries with low internal resistance and excellent discharge rate characteristics and cycle characteristics. [Solution] A positive electrode composition containing carbon black, carbon nanotubes, an active material, a binder, and a liquid medium, wherein the solid content concentration is 60 to 85% by mass, and the ratio of viscosity V2 at a shear rate of 1 (1 / sec) at 25°C to viscosity V1 at a shear rate of 0.01 (1 / sec) at 25°C (V2 / V1) is 0.02 or more and 0.2 or less.

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 resin composition for melt spinning of the present invention is a filament having a melt viscosity of 250 Pa·s or less at 200° C. and a shear rate of 0.1 s−1 and a tensile strength of 10 MPa or more. The filament can be produced by forming a molten liquid of a resin composition having a melt viscosity of 250 Pa·s or less at 200° C. and a shear rate of 0.1 s−1 into a filament shape to provide a formed material, and conveying and concurrently cooling the formed material. The present invention also provides a resin composition for melt spinning being a filament, and a method for producing fiber using a melt spinning apparatus.

The present invention relates to a dispersion comprising i) a dispersant; ii) at least one polythiophene dispersed in the dispersant i); wherein for the dispersion, the power law exponent n in the Ostwald de l / l / ae / e relationship T = K yn is in the range of 0.40 to 0.65, where T is the shear stress, K is the flow consistency coefficient, and Y is the shear rate dy / dt. The invention also relates to a method for producing a dispersion, to a dispersion obtainable by this method, to a method for producing a layered body, to a layered body obtainable by this method, and to the use of a dispersion for forming a polymer outer layer in a capacitor.

The invention relates to a production process and a formula of an ultrathin plastic tube. The production process comprises the following steps: mixing thermoplastic polyester resin, a modifier and an auxiliary agent according to a ratio of (90-95): (3-8): (0.5-2); a double-order variable-depth and variable-pitch screw extruder with the length-diameter ratio of 1: 30 is adopted, the first shearing section is located at the position of 25-35% of the length of a screw, the depth of a screw groove is changed from H1 to 0.6 H1, and the shearing speed is 800-1200 s <-1 >; the second shearing section is located at the position 60-70% of the length of the screw, the depth of a screw groove is changed from H2 to 0.4 H2, and the shearing rate is 1500-2000 s <-1 >; the temperature of the feeding area is 245 + / -2 DEG C, the temperature of the transition area is 250 + / -2 DEG C, the temperature of the compression area is 275 + / -3 DEG C, the temperature of the homogenization area is 275 + / -3 DEG C, the temperature of the die head connecting area is 250 + / -2 DEG C, and the temperature of the die head area is 250 + / -2 DEG C; the melt is filtered through a 200-300-mesh multi-layer filter screen and then enters a three-stage temperature control forming system, and the melt is extruded to form a film under the conditions that the die lip gap is 0.05-0.12 mm and the linear speed is 10-30 m / min.

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 precision coating composition that includes organic solvents and film-forming constituents, where the coating composition has a shear thinning rheological profile; and where under a shear rate of 0.1 s−1, the coating composition has a viscosity of from 1,000 cps to 30,000 cps measured using an Anton Paar MCR 301 or Anton Paar MCR 302 rheometer with a Double Gap Cylinder equipped with a DG26.7 measuring system at 25° C. The precision coating composition can be applied to a substrate using a precision applicator to form a coating layer over at least a portion of a substrate; and exposing the coating layer to a sufficient amount of energy for a sufficient amount of time for the coating layer to coalesce to form a uniform coating on the substrate, where the amount of energy does not cause an appreciable cure of the precision coating composition.

The invention relates to the technical field of viscosity detection, and particularly discloses a viscosity detection device for anti-corrosion adhesive tape production, the viscosity detection device comprises a base, the top end of the base is fixedly connected with a detection box through a flange, the side wall of the detection box is rotatably provided with two groups of friction discs capable of being rotatably adjusted, and the two groups of friction discs both have two states: the first state, the second state and the third state; in the first state, the two friction discs rotate relatively at a constant speed, and in the second state, the two friction discs rotate relatively at an accelerated speed. By combining constant-speed and acceleration dual-mode detection, a viscosity-torque relation curve of the anti-corrosion adhesive tape under steady-state stretching can be accurately established, the adhesion consistency of a product under a conventional winding condition can be effectively judged, and by simulating the acceleration process from a static state to a constant speed in actual construction, the adhesion consistency of the anti-corrosion adhesive tape can be effectively judged. The rheological response of the adhesive tape at the variable shear rate is dynamically captured, so that the viscosity starting performance and the instantaneous stripping resistance of the adhesive tape are comprehensively evaluated, and the limitation that a dynamic construction process cannot be reflected by traditional single-speed-point detection is solved.