Device and method for online measuring polymer melt rheological parameter

Abstract

The invention discloses a device and a method for online measuring a polymer melt rheological parameter. The device comprises a temperature control device, wherein a storage chamber is formed in the temperature control device; a piston is arranged above the storage chamber, and a plurality of capillary opening molds which are spaced to one another are sequentially arranged below the storage chamber from top to bottom; the storage chamber is connected to a fused plasticizing section of an extruder through a melt pump, the melt pump is used for introducing the polymer melt into the storage chamber from the fused plasticizing section of the extruder, and the polymer melt in the storage chamber can be sequentially extruded from a plurality of capillary opening molds under the extrusion of the piston. By adopting the device, the Bagley and Rabinowitsch correction can be synchronously carried out, the real shear viscosity of the material can be measured in real time, and the instantaneous tensile viscosity of the melt can be measured by utilizing a Cogswell method; in addition, the wall slippage phenomenon of the melt can be researched by replacing different capillary opening molds in different sizes. Compared with the traditional offline measurement method, the device and the method have the advantages that the rheological behavior of the material in a processing device can be really reflected.

Description

technical field [0001] The invention relates to the field of molding and processing of polymer materials, in particular to a device and method for online measuring rheological parameters of polymer melts. Background technique [0002] The rheological properties of polymers are an important technical indicator for testing the quality of final products. Scientific measurement of rheological parameters of polymer materials can help to understand the rheological behavior of polymers, so as to obtain excellent extrudate properties. Capillary rheometer is currently the most mature and widely used instrument for characterizing the rheological properties of polymers. It can not only measure the shear viscosity of polymers, but also characterize the extrusion behavior of polymers, and then study the viscoelasticity of polymers. Behavior. However, although the traditional off-line rheometer can measure various rheological data and provide the necessary theoretical basis for polymer p...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a device and method for online measurement of rheological parameters of polymer melts; Change rules to overcome the problems caused by the differences between the measurement results and the actual processing environment in the prior art

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