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A Differential Measurement Method of Viscous Dissipation in Microscale Polymer Melt Extrusion

A viscous dissipation, melt extrusion technology, applied in the field of polymer rheology testing, can solve the problems of viscous dissipation heat loss, low accuracy of measurement methods, etc., to reduce heat loss, low thermal conductivity, and improve measurement accuracy Effect

Inactive Publication Date: 2020-07-24
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the technical problem of viscous dissipation heat loss in the entrance section of the die in the existing method, resulting in low accuracy of the measurement method, and provides a micro-scale polymer melt extrusion viscous dissipation differential measurement method

Method used

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  • A Differential Measurement Method of Viscous Dissipation in Microscale Polymer Melt Extrusion

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Experimental program
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specific Embodiment approach 1

[0017] Specific implementation mode 1: In this implementation mode, a microscale polymer melt extrusion viscosity dissipation differential measurement method is specifically carried out according to the following steps:

[0018] 1. Install the micro-scale polymer melt extrusion viscous dissipation measurement device at the opening of the rheometer;

[0019] 2. Put the polymer particles into the rheometer cylinder 1, use the temperature control system of the rheometer to plasticize to keep the temperature of the polymer melt constant, and set the shear rate; the polymerization in the rheometer cylinder 1 The molten material flows out from the capillary die 4 and directly contacts the measuring part of the miniature temperature sensor 7;

[0020] 3. The heat generated by viscous dissipation when the polymer melt in the capillary die 4 flows in a steady state is transferred to the capillary die 4, and the temperature of the capillary die 4 rises, and the extruded polymer melt is ...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the micro-scale polymer melt extrusion viscosity dissipation measurement device includes a rheometer barrel 1, a sleeve 2, and a die support 3 , capillary die 4, fixed sleeve 5, sleeve support 6, miniature temperature sensor 7 and data acquisition system 8; Wherein rheometer barrel 1 outlet adopts threaded connection die support 3, in the rheometer barrel 1, the sleeve 2 is pressed on the die support 3, the capillary die 4 is set at the entrance of the rheometer barrel 1 and pressed on the sleeve 2, and the side of the capillary die 4 with the ring groove 9 facing downward ; One end of the sleeve support 6 withstands the miniature temperature sensor 7, and the other end sits on the die support 3; one end of the fixed sleeve 5 has a round hole, and the other end is processed with an internal thread, and the measurement part of the miniature temperature sensor 7 passe...

specific Embodiment approach 3

[0025] In the third embodiment: the difference between this embodiment and the first or second embodiment is that the detection part of the miniature temperature sensor 7 is a circular plane. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a microscale polymer melt extrusion viscous dissipation measuring method, relates to the technical field of polymer polymer rheology testing, in particular relates to the microscale polymer melt extrusion viscous dissipation measuring method, and aims to solve the technical problems that a measuring method is low in accuracy since viscous dissipation heat loss can be causedat an inlet section of a mouth mold when a conventional method is used. The method comprises the following steps: I, mounting a microscale polymer melt extrusion viscous dissipation measuring device;II, putting polymer granules, and setting up a rheometer; III, measuring a primary viscous dissipation temperature; IV, replacing a capillary tube mouth mold, and mounting the measuring device for another time; V, repeating operation of the step II and the step III, and measuring a secondary viscous dissipation temperature; and VI, performing calculation. By adopting a differential method, and through differential calculation, viscous dissipation errors caused at the inlet section of the mouth mold can be eliminated, and the measurement precision of average temperature increase of viscous dissipation can be improved. The method is applied to measurement on polymer melt extrusion viscous dissipation.

Description

technical field [0001] The invention relates to the technical field of polymer rheology testing, in particular to a method for measuring viscosity dissipation of microscale polymer melt extrusion flow. 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 fluid flow process, which will directly affect the temperature change and rheological properties of the fluid flow process. 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, and part of the heat is taken away by the die when measuring with a traditional metal die. On the other hand, the measurement accuracy is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/04
CPCG01N11/04
Inventor 徐斌杨君薛松李光明
Owner SOUTHWEAT UNIV OF SCI & TECH
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