Viscous dissipation measuring device and measuring method

Abstract

The invention relates to a viscous dissipation measuring device and a measuring method, relating to a micro-scale polymer melt steady state extrusion flowing viscous dissipation measuring device and a measuring method and aiming at solving the problem that the measuring precision is low due to adoption of contact type temperature measurement in the prior art; and the measuring device comprises a rheometer charging barrel, a capillary orifice mould, a temperature sensor I, a temperature sensor II, a fixing device I, a fixing device II and a data acquisition system, wherein an annular groove is arranged at the periphery of a central round hole of the capillary orifice mould and opened downwards, extruded polymer melt is fully filled in the annular groove of the capillary orifice mould under the action of pressure, and the extruded polymer melt is utilized to fill the annular groove, so that the heat loss of viscous dissipation is reduced. The device and the method provided by the invention utilize a novel design of the capillary orifice mould, the heat generated by the melt viscous dissipation is not carried away by the capillary orifice mould, and therefore, the precision of measuring the average temperature rise of the viscous dissipation is high.

Description

technical field [0001] The invention relates to the field of polymer rheology testing, in particular to a measuring device and a measuring method for the steady-state extrusion flow viscosity dissipation of a microscale polymer melt. Background technique [0002] Viscous dissipation is an inherent physical phenomenon in the extrusion flow of polymer melts. The mechanical energy caused by the viscous friction force is converted into heat energy during the flow of the fluid, which will directly affect the temperature change during the flow of the fluid. Viscous dissipation is ignored in conventional extrusion processes. In the micro-scale range, the viscous dissipation is obvious, which affects the rheological properties of the melt, and the viscous dissipation needs to be measured. On the one hand, due to the small scale, less heat is generated. When measuring with a traditional metal die, part of the heat is taken away by the die, resulting in low measurement accuracy. C...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low measurement accuracy caused by the use of contact temperature measurement in the prior art, and to provide a viscous dissipation device and its measurement method. The flow viscous dissipation measurement uses a new capillary die design, so that the heat generated by the viscous dissipation of the melt is not taken away by the capillary die, so that the accuracy is higher when measuring the average temperature rise of viscous dissipation

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