843 results about "Rheometer" patented technology

The invention is directed to compositions comprising an elastomer component and a propylene component, and in which the elastomer component comprises at least one ethylene/α-olefin polymer, optionally containing a diene, and the polypropylene component comprises at least one branched polypropylene. Preferably, the elastomer component has a melt tan delta between about 0.7 and about 8, as measured by parallel plate rheometer at 0.1 rad/sec, 190° C., and 15 percent strain; and the ratio of the “melt tan delta of the elastomer component” to the “melt tan delta of the propylene component” is from 0.5 to 4. The invention also provides for method of making such compositions, and to low gloss articles prepared from the same. The inventive compositions are particularly suitable for fabricating thermoformed sheeting with reduced gloss.

A toner having toner particles, each of which contains a binder resin and a colorant, wherein in viscoelastic properties of the toner as measured with a rotating flat plate rheometer at a frequency of 6.28 rad/sec:

• • a storage elastic modulus at the temperature of 60° C. (G′60) is in a range from 1.0×10⁷ to 1.0×10⁹ (Pa), and
  • a maximal value (G′p) exists for the storage elastic modulus in a temperature range from 110° C. to 140° C., with this G′p being in a range from 5.0×10⁴ to 5.0×10⁶ (Pa).

The invention discloses a preparation method of materials which are used for bone plates, bone nails and bone blocks, including the following steps: biomedical fiber, hydroxyapatite, polylactic acid and compatibilizer are arranged at a twin-screw extruder or a torque rheometer for melt blending; or the polylactic acid and the hydroxyapatite which is grafted by using the polylactic acid macromonomer are dissolved in chloroform, the biomedical fiber is added for even dispersion, and the thin film can be obtained by vacuum drying after the volatilization of the chloroform; or the polylactic acid and the biomedical fiber are woven into mesh structure, then the mixed solution of hydroxyapatite powder which is grafted by using the polylactic acid macromonomer and the polylactic acid is added, and the vacuum drying is carried out after the volatilization of the solvent; finally, the materials which are obtained by the method are done with the pressing forming on a flat sulphuration machine or done with the injection forming by using a precise injection machine. The preparation method of the materials which are used for the bone plates, bone nails and bone blocks of the invention has strong practicality, easy industrial production and can significantly improve the mechanical properties of the bone repair materials.

A micro-rheometer for measuring flow characteristics such as viscosity, elasticity, and flow rate of a sample liquid combines well defined micro-fabricated flow channels having geometry changes forming a constriction region therein to a monolithically fabricated pressure sensor arrays. The pressure sensor array positions pressure sensors to measure the viscosity of the sample liquid while flowing in a uniform length of the flow passage and to measure the extensional viscosity while flowing through the constriction region of the passage. The invention can improve the measurement accuracy of the flow rate, viscosities, or elasticities over a wide range of shear rate. The accuracy of the viscosity over a broader range of shear rate or flow rate measurement over broader range of flow rates can be accomplished by employing monolithically integrated pressure sensors fabricated with different sensitivities disposed in a known manner. The invention further includes necessary components such as a display, a pumping system, valve manifolds, and software for a portable or laboratory measurement instrument, process control, and high throughput measurements.

The invention relates to a joint testing device and method of the rheological property of a polymer solution and the relative permeability of a core. The device provided by the invention comprises a polymer injection unit, an oil injection unit, an online rheometer, a core holder, an oil-liquid separator, a pressure difference sensor and an electronic weighing instrument which are connected through pipelines and control valves. The method provided by the invention comprises the following steps: placing a core into the core holder; injecting a polymer solution sample into the core in the core holder by utilizing the polymer injection unit; collecting pressure difference and flow data; computing the viscosity of the polymer solution under different flows; obtaining the rheological curve of the polymer solution by combining the relation of the shear rate and flow in the online rheometer according to the relationship between the shearing rate and flow in the online rheometer; injecting oil by utilizing the oil injection unit to remove the polymer solution out of the core; injecting the polymer solution into the core by utilizing the polymer injection unit so as to remove the oil; in the removing and substituting process, measuring the change of the oil quantity in real time by utilizing the oil-liquid separator, and measuring the change of the total liquid quantity of the oil and the polymer in real time by utilizing the electronic weighing instrument; and finally, computing the relative permeability of the polymer solution and the oil by utilizing the obtained data such as the flow, the oil yield, the solution yield, the pressure difference and time.

The invention relates to a dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method. The rheometer comprises a dynamic disturbance system, a frame, a guide rail, a lifting mechanism, a pressure chamber, a trolley, a temperature control system, an axial loading system, a confining pressure loading system, a measuring system, a control system and a computer and software system, a loading cylinder in the axial loading system can switch between a lead screw booster and a servo valve through a switching valve, a servo oil source, a servo valve and a loading cylinder are communicated through the switching valve when a conventional triaxial compression test is performed, the lead screw booster is communicated with the loading cylinder through the switching valve when a triaxial rheological test is performed, and rock samples are subjected to dynamic disturbance by the aid of a weight dynamic disturbance system or an impacting cylinder disturbance system. The rheometer effectively achieves rock triaxial loading and unloading rheological tests and conventional triaxial compression tests under the conditions of negative temperature and dynamic disturbance and is simple in integral structure principle, variable in function and high in applicability.

The invention discloses an evaluation method for lithium ion battery anode paste stability. An acid type burette is filled with anode paste, after vertical standing is carried out for 1-5 hours, the paste is measured from the upper end part and the lower end part of the burette respectively, a shear rate-viscosity curve of the paste is measured by using a rheometer, when the coincidence of the shear rate-viscosity curves of the paste on the upper end part and the lower end part is good, the paste stability is shown to be good, otherwise, the paste stability is shown to be poor. According to the evaluation method disclosed by the invention, operation steps are simple and quick, the practicability is high, test results are accurate, the reproducibility is good, and accurate reference can be provided for the evaluation of the paste stability.

The invention comprises a pressure sensor, a displacement sensor servo system, an axial output oil cylinder piston, an axial servo loading system, a computer and a loading frame. The loading frame is connected to the pressure sensor; the pressure sensor is connected to the triaxial pressure chamber; the triaxial pressure chamber is connected to the metal piece; the triaxial pressure chamber is respectively connected to the loading frame and base; there is an axial spacer located in the triaxial pressure chamber; a lateral extensometer chain and a lateral extensometer clamp are mounted on the sample tunnel wall of the triaxial pressure chamber.

The invention discloses a preparation method for a high molecular weight polylactic acid steric composite. The preparation method comprises the following steps: mixing poly-levo-lactic acid and poly-dextro-lactic acid according to the weight ratio of 80:20 to 20:80; and mixing the mixture in a torque rheometer at the temperature of between 140 and 210 DEG C and at the mixing rotating speed of 10 to 120 r/min for 1 to 60 minutes so as to prepare the high molecular weight polylactic acid steric composite. The polylactic acid is not plastified or not completely plastified at the mixed temperature; and strong interaction occurs between the molecular chains of poly-levo-lactic acid and poly-dextro-lactic acid which are not plastified or not completely plastified, so that high-content even total-content steric composite is formed in the high molecular weight polylactic acid. Compared with the conventional method, the preparation method has the advantages of simplicity, high efficiency, wide application values of products and the like.

The invention relates to a true triaxial hydraulic coupling test device for realizing visualization based on a biaxial rheometer, thereby carrying out hydraulic coupling testing on a marble sample with front and rear surfaces having centers with penetrating cracks in a front-rear communication manner. The true triaxial hydraulic coupling test device comprises two modified polycarbonate plates thatare in a mutual butt joint manner to form square sealed inner space and a biaxial rheometer loading assembly for applying pressures on a marble sample in four directions. The marble sample is arranged in the sealed inner space; and the biaxial rheometer loading assembly applies pressures on the marble sample by the modified polycarbonate plates.. Compared with the prior art, the true triaxial hydraulic coupling test device has advantages of true three-axis loading, visual operation, and the like.

The invention relates to a talus slope freezing and thawing circulating action deformation physical model experiment apparatus and experimental method. The talus slope freezing and thawing circulating action deformation physical modeling experiment apparatus comprises a base placed on a talus slope, wherein a metal base plate and an organic glass model box are sequentially arranged on the base from bottom to top; a front door is arranged on the organic glass model box; a water drainage hole is formed in the bottom of the front door; a flow velocity rheometer is arranged between the water drainage hole and the front door; snow melting devices are respectively arranged on the two sides, and at the front part and the top of the organic glass model box; a thermometer is arranged at the top of the organic glass model box; a loading device is arranged at the rear part of the organic glass model box; at least a displacement meter is arranged inside the talus slope. The experiment apparatus disclosed by the invention can solve the problems that the existing talus slope physical simulator is single in test result, unstable in test result and incapable of simulating the freezing and thawing circulating action, has the characteristics of being convenient to operate and high in testing efficiency, and is suitable for simulation tests on slope deformation and breakage induced by freezing and thawing circulation and tunnel portal slope excavation.

The invention relates to the field of experiment test instrument of a soil engineering material of geotechnical engineering and in particular relates to an intelligent soil engineering shear rheometer. The rheometer consists of an experiment platform, a loading system, a data acquisition system and a data processing system, wherein the experiment platform ensures the horizontality and stability of an experiment test; the loading system consists of a vertical loading system and a horizontal loading system, and realizes the loading through weights to ensure the load accuracy; the data acquisition system consists of a displacement meter and a tension sensor, has a relatively high accuracy, transmits and receives a data signal in a wireless manner, and ensures remote processing and monitoring of an experiment; and the data processing system realizes the functions of real-time automatic acquisition, storage, display and processing of data through software development. Compared with the prior art, the intelligent soil engineering shear rheometer provided by the invention has simple operation steps and relatively high experiment accuracy, realizes remote operation, and has a relatively high degree of intellectualization and relatively great application values for a soil engineering rheological test experiment.

The present invention provides an oral composition comprising capsule particles that are easily breakable to thereby readily release and distribute the capsule contents when used, while leaving substantially no feeling of capsule component residues or foreign matter in the mouth when rinsing. More specifically, the present invention relates to a capsule-containing oral composition comprising capsules with a capsule breaking point strength of 0.05 N or less when measured using a rheometer.

A magnetic toner is provided that exhibits an excellent dot reproducibility and developing performance after being allowed to stand in a high temperature and high humidity environment and an excellent low-temperature fixability. The magnetic toner has an inorganic fine powder and a magnetic toner particle containing a binder resin, a magnetic body, and a release agent, wherein in a stress relaxation measurement using a rotating plate rheometer, the magnetic toner exhibits a yield value A at 25° C. of at least 3×10⁶ (sec), and the magnetic toner that has been heated to 80° C. and then cooled to 25° C. exhibits a yield value B at 25° C. of not more than 1×10⁵ (sec).

A rheometer apparatus includes an acoustic wave viscosity sensor associated with a flexural plate wave device configured to include a central cavity through which a fluid flows. A plurality of interdigital transducers cam be associated with the flexural plate wave device, wherein each interdigital transducer (IDT) thereof can measure viscosity associated with the fluid over a variable range of shear rates. The variable range of shear rates can be achieved by varying the flow rate of the fluid due to an adjustment of a vibrating amplitude associated with the flexural plate wave (FPW) device (e.g., an FPW pump).

The invention relates to a device and a method for measuring steady-state extrusion viscous dissipation of a micro-scale polymer fused mass. The device and the method are characterized in that on the basis of a capillary rheometer with two material barrels, a temperature sensor is arranged at an outlet of a neck ring mold of a capillary tube in the material barrel through a fixing device, the outlet of the neck ring mold of the capillary tube is aligned with a measuring part of the temperature sensor, and the distance between the neck ring mold of the capillary tube and the sensor is adjusted by additionally mounting a spacer; and the other temperature sensor is arranged at the outlet of the other material barrel through the fixing device for the convenience of measuring the temperature of the fused mass simultaneously by the two sensors. The flow parameters of the fused mass are set on the rheometer, the fused mass flows out of the neck ring mold at certain shearing rate through by the extrusion action of a plunger, and the sensors measure the temperature of the extruded fused mass directly. The temperature difference of the two sensors is calculated out so that the temperature rise of the fused mass caused by the viscous dissipation can be measured. The device and the method has the advantages and benefits that the temperature control of the fused mass is constant, the temperature is measured accurately and quickly, the fixing device is easy to assemble and disassemble, the neck ring mold is convenient to replace, and the range of measuring the shearing rate is higherwider.

The present invention relates to an on-line polymer double-capillary extrusion rheometer, belonging to the field of polymer rheo-testing technology. It is characterized by that said rheometer is formed from connecting tube, base seat, regulating bolt, pressure/temperature sensor, temperature control device, balance, extrusion expansion measuring device, casement plate, capillary and setting plate. Said invention also provides the working principle of said rheometer.

The invention relates to a parallel-type rock temperature, seepage and stress coupling triaxial rheometer which comprises a loading framework, wherein a plurality of triaxial pressure chambers are arranged in the loading framework; pressure heads of the triaxial pressure chambers are respectively connected with an axial pressure servo control system; the triaxial pressure chambers are connected with a confining pressure servo control system through oil pipes; samples in the triaxial pressure chambers are connected with a pore pressure servo control system through water pipes; electrical heating parts are arranged on the outer wall of the triaxial pressure chambers, and are connected with a temperature control system; the axial pressure servo control system, the confining pressure servo control system, the pore pressure servo control system and the temperature control system are all connected with a data acquisition and control system through electric circuits; the data acquisition and control system controls the stress field, the seepage field and the temperature field of the samples in real time, so as to measure the rheological deformation of the samples under different temperature, seepage and stress coupling conditions. The triaxial rheometer can be used for conducting a plurality of groups of rheological tests under different temperature, seepage and stress coupling conditions at the same time.

The invention relates to a rheometer, comprising a rotatable shaft (1), to which a rotor plate (2) is fixed, and a measuring device (10), for measuring torques exerted on the rotor plate (2) by a substance under investigation during a rotation of the shaft (1), wherein a first measuring gap (5), for accommodating the substance (6) under investigation, is formed between a first side (3) of the rotor plate (2) and a first shear surface (4) and a second measuring gap (9), for accommodating the substance (6) under investigation, is formed between a second side (7) of the rotor plate (2) away fromthe first and a second shear surface (8). The rheometer contains a magnet for generating a magnetic field in the first and second measuring gaps (5, 9).

An ultrasonic plasticizing capillary rheometer comprises a frame, a rheological test unit, an ultrasonic vibration apparatus, and a tool head moving and loading unit. The ultrasonic vibration apparatus is provided with an ultrasonic tool head capable of extending into a plasticizing chamber along an axial direction, providing extrusion force for polymer in the plasticizing chamber, and providing ultrasonic wave energy required by the polymer for fusion from a solid state to a liquid state. In the ultrasonic plasticizing capillary rheometer, three steps including heating fusion, ultrasonic vibration for fluidity increase, and material extrusion are completed through the ultrasonic tool head and in the plasticizing chamber, thereby simplifying the conveying path. A heating ring providing the required initial temperature for the plasticizing process sleeves a material canister, provides a constant material canister temperature for the rheometer, and reduces the test error. A filter screen is arranged in the material canister, centralizes fused polymer, and improves the test accuracy. During a test process, a viscosity test method is accurate in heating, short in fusion time, and wide in application range, is slightly affected by the external environment, and can provide viscosity data high in accuracy.

The present invention is directed to an apparatus and a method for monitoring the viscoelastic properties, of a liquid film (e.g. coating). The apparatus includes a substrate for supporting a liquid film and a T-bar probe that is partially submerged in the liquid film. The apparatus is designed to be attached to a conventional rheometer equipped with a means for effecting relative movement between the probe and the substrate and means for monitoring the resistance to movement of the probe in contact or partially submerged in the film to obtain a measurement of the solidification properties of the liquid film. This apparatus and method are particularly useful in comparing the effects of film formers, viscosity modifiers, solvents, and minerals on the drying rate of coatings at the early stage of film formation.

The present invention provides a carrier for electrostatic image development, and a developer, an image formation method and an image formation apparatus using the carrier. The carrier is carrier particles. When the carrier particles each have a coating layer on a magnetic particle, the carrier has a total energy amount of 1500 to 3000 mJ. When the carrier particles each have a coating layer on a magnetic powder-dispersed particle, the carrier has a total energy amount of 1000 to 1500 mJ. The total energy amount is measured with a powder rheometer at a tip end speed of a rotor of 100 mm/s and a helix angle of the rotor of −5°. The total energy amount is a value of a portion of the carrier in a measurement container which portion is contained in the region between the packed surface of the carrier and a surface disposed under the packed surface by 70 mm.

The invention relates to a method for quickly measuring the viscous flow activation energy of polyolefin, which is used for measuring the viscous flow activation energy of polyolefin such as polyethylene, polypropylene, and the like. The method comprises the following steps of: carrying out temperature scanning at a temperature above the smelting point of polyolefin and below a decomposition temperature by using a dynamic rheometer to measure a plurality of change curves of the viscosity changed along with the temperature of the polyolefin; converting a measurement result into change curves of the apparent viscosity changed along with the temperature of a sample through a Cox-Merz rule; carrying out linear regression on the converted data by using a formula of lgeta=K/T+b to obtain the values of K and b in the regression formula; and then obtaining the viscous flow activation energy of the measured sample according to a formula of Eeta=19.147*(J/mol). The method has the advantages of fewer required samples, short measurement period, high speed and high efficiency.

A system for measuring rheological property of magnetic rheological liquid is prepared as setting ring magnetic conductor and main magnetic conductor in base to form measurement space between the two, enabling shear arm under rotary shaft bottom to extend its arm in said space for shearing magnetic rheological liquid in it, setting excitation coil in main magnetic conductor with its two tail ends guided out by leading wire, forming epoxy seal ring by using epoxy glue to seal excitation coil top, and setting a connecting through hole of heat transmission liquid on bottom barrel wall of base and external barrel wall of main magnetic conductor.