362 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 discloses an optimized preparation method of a high-strength flame-retardant polyamide-based composite material in the technical field of information, which comprises the following steps: in the preparation process of the composite material, acquiring online dispersed state monitoring data of a modified filler by using a laser particle size analyzer and an optical microscope, including particle size distribution, agglomeration degree and dispersion uniformity of the filler; according to online dispersion state monitoring data, parameter ranges of melt flow property characterization are determined, the parameter ranges comprise the shearing rate and the temperature, particle size distribution data are used for determining the shearing rate range, small particle size distribution corresponds to the high shearing rate range, and agglomeration degree data are used for determining the temperature range; the higher degree of agglomeration corresponds to a higher temperature range to promote the dispersion of the filler, and these parameters are directly used to guide the setting of the subsequent rheological test.

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 an industrial automatic control system, which relates to the technical field of industrial automatic control and comprises an initial uniform mixing module, a real-time parameter monitoring module, a feature extraction and quantification module, an intelligent state evaluation module, a state classification decision module, a stable stage operation module and a dynamic speed regulation response module, the paper pulp raw materials are mixed by the high-shear mixer at the preset shear rate, so that uniform dispersion of fibers, fillers and additives is ensured, and the flowability and consistency of the pulp are improved. The paper pulp mixing quality is collaboratively optimized through the initial mixing module, the real-time monitoring module, the intelligent evaluation module and the dynamic speed regulation module. Bubble generation signals are accurately captured, bubble cores are quickly responded and damaged, and defects are avoided; in the stable stage, the standard shearing rate is maintained, energy consumption and equipment abrasion are reduced, the production efficiency is improved, scrap is reduced, the operation cost is optimized, and the market competitiveness is enhanced.

A composition for temporary bonding, comprising the following (A) to (C), and having a viscosity ranging from 500 to 10,000 mPa.s at atmospheric pressure at 23°C and a shear rate at 1 s-1 as measured by a rotatory rheometer: (A) a monofunctional (meth)acrylate having a surface tension ranging from 20 to 30 mN / m as measured by ds / de method of pendant drop method at 23°C; (B) a polyfunctional (meth)acrylate, which has a viscosity of 1,000 mPa·s or more at atmospheric pressure at 23°C and a shear rate at 1 s-1 as measured by a rotatory rheometer, is solid at 23°C, or has a molecular weight of 500 or more and a viscosity of 100 mPa·s or more and less than 1,000 mPa·s at atmospheric pressure at 23°C and a shear rate at 1 s-1 as measured by a rotatory rheometer; and (C) a photo radical polymerization initiator.

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.

An inkjet recording ink includes: a pigment; a binder resin particle; and an aqueous medium. The aqueous medium includes glycolether, a specific organic solvent, and water. The specific organic solvent is a glycol compound having 3 or more and 6 or less carbon atoms. A content ratio of the specific organic solvent is 27.5 mass % or more and 35.5 mass % or less. Shear viscosity of the inkjet recording ink measured at a temperature of 32° C. and a shear rate of 105 s−1 is 5.5 mPa·s or more and 7.0 mPa·s or less. A drying rate of the inkjet recording ink is 20% or more and 40% or less.

Process for the preparation of an asphalt mix composition, said process comprising: (1) heating an asphalt composition to a temperature in the range of from 110 to 190° C. to obtain a first input stream; (2) providing one or more thermosetting reactive compounds to obtain a second input stream; and (3) homogenizing the streams of (1) and (2) in at least a first tank fitted with a first impeller, wherein the impeller allows an axial velocity>0.4 m / s, a radial velocity>0.65 m / s, and a shear rate>3.5 s−1; and wherein homogenization of (3) is carried out at a mixing power<3 W / kg.

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 relates to the field of oil field drilling, and discloses a method, a system, a medium and equipment suitable for judging a rheological mode of drilling fluid in a polar region, and the method comprises the following steps: drawing a shearing stress-shearing rate rheological curve of the drilling fluid under various temperature conditions according to rheological property experimental measurement data; calculating the plastic viscosity, the dynamic shear force, the flow index and the consistency coefficient of the drilling fluid; fitting the rheological curve of the drilling fluid under each temperature measurement condition based on the plastic viscosity, the dynamic shear force, the flow index, the consistency coefficient and the constitutive equation of the four rheological modes; wherein the four rheological modes comprise a Bingham mode, a power law mode, a Casson mode and a Heschel-Balcoril mode; drawing a fitting curve according to a fitting result, and solving mean square errors and judgment coefficients of the four rheological modes under each temperature condition; and judging the applicability of the four rheological modes to the polar drilling fluid measured under different temperature conditions through the judgment coefficients so as to determine the rheological mode with the best applicability.

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 belongs to the technical field of quality detection, and discloses a plastic film blow molding production quality on-line detection method, which adopts a melt rheology detection device to detect viscosity, shear rate and temperature in real time, combines a mathematical model to calculate a flow index and a viscosity error, and adjusts extrusion temperature or shear rate according to a detection result. The influence of rheological fluctuation on the final thickness is reduced from the melt stage; the temperature and the initial thickness of the melt are measured through an infrared detection device, thickness data of transverse TD and longitudinal MD are obtained in combination with a laser thickness measurement device, the thickness deviation is calculated, the die gap is adjusted, and the initial film thickness is stabilized; the temperature distribution of the film bubbles is obtained through an infrared detection device, and the thickness of the film bubbles is measured by combining a laser thickness measuring device; an ultrasonic thickness measuring device is used for measuring the thickness of the thin film, a CNN (convolutional neural network) is used for extracting thickness features and predicting thickness distribution, the traction rate or air ring air pressure is adjusted in combination with detection data, and the uniformity of the thickness of a final product is improved.

The invention provides a method and a system for calculating wellbore pressure at a temperature-pressure coupling low shear rate, and belongs to the technical field of drilling engineering. According to the method, the rheological parameters of the fluid at the low shear rate are obtained by fitting in combination with the test data of the fluid at the low shear rate; and on the basis, a calculation model of the fluid rheological parameters under the temperature and pressure conditions is established in combination with the influence of the fluid temperature and pressure on the fluid rheological parameters, and a wellbore circulation friction calculation model of the fluid at the low return speed is obtained according to a fluid circulation friction pressure drop calculation equation. According to the method, a key reference method is provided for accurate calculation of the wellbore pressure of fluid under the condition of low return speed under deep well temperature-pressure coupling, and finally, the occurrence of complex conditions such as leakage and overflow in the drilling and completion process of a deep narrow safe density window stratum is reduced.

This application describes a viscosity measuring instrument that measures viscosity as a function of shear rate in a high throughput manner. The instrument may include multiple viscosity measurement sensor chips arranged in parallel so that viscosity is measured at multiple shear rates simultaneously for many samples. For example, the instrument may include multiple viscosity sensors with liquid flow channels for measuring viscosities of liquids flowing through the flow channels and multiple syringes, each outlet of which is connected to a corresponding inlet of multiple viscosity sensors. The instrument may also include a pump module with a pusher block having a mechanism to lock and unlock ends of pistons of the multiple syringes.

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 provides an ink for ink jet recording and an ink jet recording apparatus. The ink for inkjet recording includes a pigment, binder resin particles, and an aqueous medium. The aqueous medium includes a glycol ether, a specific organic solvent, and water. The specific organic solvent is a diol compound having 3-6 carbon atoms (inclusive). The content ratio of the specific organic solvent is from 27.5% by mass to 35.5% by mass (inclusive). The shear viscosity of the ink jet recording ink measured at a temperature of 32 DEG C and a shear rate of 105 s <-1 > is 5.5 mPa * s to 7.0 mPa * s (inclusive). The drying rate of the ink for inkjet recording is from 20% to 40% (inclusive).

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.