Cone plate-flat plate fixture for rotational rheometer

Abstract

The invention relates to a cone plate-flat plate fixture for a rotational rheometer. The cone plate-flat plate fixture comprises an upper flat plate and a lower plate, wherein a gap between the upperflat plate and the lower plate is internally filled with a material sample to be tested; the lower plate comprises a concave cone plate positioned in the middle of the lower plate, and a lower flat plate arranged around the periphery of the concave cone plate; the radius of the upper flat plate is larger than that of the concave cone plate; the distance between the center of the concave cone plateand the upper flat plate tends to decrease as the radius increases. The cone plate-flat plate fixture is prepared by optimizing and integrating the traditional cone plate-flat plate fixture and the traditional parallel-flat plate fixture, has the advantages of the traditional cone plate-flat plate fixture and the traditional parallel-flat plate fixture, overcomes the disadvantages of the single cone plate-flat plate fixture and the single parallel-flat plate fixture, and can obtain rheological parameters of two shearing rates by testing at a time, thus optimizing the test range and results.

Description

technical field [0001] The invention relates to the technical field of rheological testing, in particular to a cone-plate-plate fixture for a rotational rheometer. Background technique [0002] The traditional cone-plate-plate fixture for rotational rheometer has the characteristics that the shear rate and shear stress are fixed and do not change with the radius of the plate. But its disadvantages are: due to the large distance between the plates at the radius, when the sample is a solvent, the solvent is easy to volatilize from the gap at the maximum radius, and the gap between the center of the cone and plate and the flat plate is small, and the filler with larger particles is measured. system is subject to certain limitations. The traditional parallel plate clamp rheometer has the advantages of easy cleaning, easy to set gap and variable gap, and high shear rate may be obtained, but the shear rate is maximum at the edge and equal to zero at the center point. Although th...

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Problems solved by technology

But its disadvantages are: due to the large distance between the plates at the radius, when the sample is a solvent, the solvent is easy to volatilize from the gap at the maximum radius, and the gap between the center of the cone and plate and the flat plate is small, and the filler with larger particles is measured. system is subject to certain restrictions

The improved cone-plate-plate fixture, although the traditional cone-plate-plate fixture has been modified, is not perfect and lacks the advantages of parallel plate fixtures

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