Mooney viscometry is to use Mooney viscometer to measure the plasticity of rubber compound. to indicate the size of the plasticity of the rubber. The structure of the Mooney viscometer is shown in the figure below.
The test process is to first heat the cavity of the mold to a constant temperature of (100±1) °C, then put the sample into the mold cavity and preheat for a certain period of time, the viscometer starts to work, and when the rotor rotates, observe the instrument. The scale value of , the displayed value is the Mooney viscosity value of the rubber compound, abbreviated as Mooney viscosity. The larger the Mooney viscosity, the higher the viscosity of the compound (that is, the lower the plasticity of the compound). The Mooney viscosity value varies with the test conditions, so the test recording method should indicate the test conditions. Usually , Mooney viscosity is represented by ML1+4 100 ℃. Among them, M shows Mooney, L1+4, 100 ℃ represents the torque value measured when the large rotor (diameter is 38.1mm) is preheated for 1min and rotated for 4min. sub-table to indicate>. The measurement range of Mooney viscosity is 0-200.
Mooney viscosity reflects the viscosity of the compound under specific conditions, and can be directly used as an indicator to measure the rheological properties of the compound. However, this method can only reflect the rheological properties of the compound at low shear rates due to its slow measurement speed and small shear rate. If the test speed is increased, the results are closer to the rheology in actual processing.
The Mooney viscometry method is quick and easy to test the plasticity of rubber compounds, and there is no need to make samples of standard shapes. In addition, this method can also easily measure the scorch time of the rubber compound (that is, using a rotor with a diameter of 30.5mm, after the rubber compound is preheated at 120°C for 1min, it is measured when the Mooney viscosity value drops to the lowest value. Then turn into the time required to increase the Mooney value by 5, which is called scorch time), so that the processing safety of the rubber compound can be known in time. Therefore, the concept of Mooney viscosity is widely used in scientific research and production.
Disclaimer: The picture materials and articles on this platform are from the Internet, so the copyright belongs to the original author. If your copyright and interests are infringed, please contact us, we will apologize and delete it quickly. Article source: Rubber Technology Network
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