CN103822851A

CN103822851A - Double-charging barrel capillary pipe rheometer

Info

Publication number: CN103822851A
Application number: CN201410046604.XA
Authority: CN
Inventors: 李振中; 覃富忠; 田生喜
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-02-10
Filing date: 2014-02-10
Publication date: 2014-05-28

Abstract

The invention relates to a double-charging barrel capillary pipe rheometer, and belongs to the technical field of high polymer rheological measurement. The core component double capillary pipe orifice die of the rheometer is designed into a long capillary pipe orifice die and a short capillary pipe orifice die, and the design of a zero long capillary pipe orifice die of the traditional conventional double-charging barrel capillary pipe rheometer is changed. The double-charging barrel capillary pipe rheometer drives and controls a plunger to extrude high polymer fluid in two charging barrels with the same internal diameters at the same rate through a servo motor and a screw, then the fluid enters two capillary pipes with the same internal and external diameters and different lengths, pressure is respectively measured through a pressure sensor, and after the pressure is subtracted, pressure drop of fluid flowing through inlets and outlets of the capillary pipes can be conveniently eliminated; meanwhile, compared with a zero long capillary pipe, the fluid in the short capillary pipe orifice die with certain length is provided with a completely developed flowing region with certain length, and flowing conditions of the fluid in long and short capillary pipes are more similar, so that the pressure drop measured finally is more accurate and closer to the practical situation.

Description

A kind of Double Die Capillary Rheometer

Technical field

The invention belongs to superpolymer rheology technical field of measurement and test, especially a kind of Double Die Capillary Rheometer.

Background technology

Rheological property is the important performance of superpolymer, the processing of the quality of rheological property on superpolymer and be prepared with important impact, thereby the rheological data of Accurate Determining superpolymer is most crucial.Capillary rheometer is one of key instrument of measuring rheological property, it is by measuring the changing value of shear viscosity with various Polymer Structure parameters (as molecular weight, molecular weight distribution, cladodification degree) and flow field parameter (as shear rate, temperature, pressure), set up the quantitative relation formula between them, obtain theoretical model and and guide actual production.Because thin material cylinder capillary rheometer exists very large entrance pressure drop, need to adopt loaded down with trivial details Bagley to proofread and correct, at present general capillary rheometer is Double Die Capillary Rheometer in the world, can eliminate well entrance pressure drop, and can be able to predict preferably the draft flowing deformation performance of material.But what at present nearly all Double Die Capillary Rheometer adopted is distance of zero mark capillary die, and fluid in distance of zero mark kapillary does not have complete developing flow district, due to the viscoelasticity feature of superpolymer fluid, the elasticity of fluid is larger what reply after distance of zero mark kapillary, and after long capillary, reply less, cause thus distance of zero mark top hole pressure capillaceous to fall with the top hole pressure of long capillary and fall and have larger difference, cause measurement result and actual conditions to have certain gap.

Summary of the invention

The object of the invention is to the deficiency for existing instrument, a kind of Double Die Capillary Rheometer is provided, critical piece has portable plate, two barrels, two plungers, long and short two capillary and temperature and pressure sensors; Described two plungers are enclosed within respectively in two barrels, and described long capillary and short capillary lay respectively at the bottom of two barrels, and described temperature and pressure sensor is two, lays respectively at top capillaceous, and concordant with the inwall of two barrels respectively.Wherein portable plate upper end is connected with servomotor, two barrels are around heated at constant temperature sleeves, become melt for adding thermal material, and two plungers are vertically fixed on portable plate, the Length Ratio of long capillary and short capillary is 3/2～4/1, die entrance angle 10～50 capillaceous.This flow graph is driven and is controlled plunger with the polymeric fluid in the identical barrel of identical two internal diameters of speed extruding by servomotor and leading screw, then enter two parallel capillary tubes that inside and outside footpath is identical, length is different, by respectively gaging pressure of pressure transducer, the eliminate fluid entrance and exit Pressure Drop capillaceous of flowing through easily after pressure subtracts each other; Simultaneously with respect to distance of zero mark kapillary, there is the complete developing flow district that fluid in the short capillary mouth mould of certain length possesses certain length, the mobility status of fluid in long and short two kapillaries is more close, makes the Pressure Drop that finally records more accurate, more approaches actual conditions.

Accompanying drawing explanation

By describing in more detail exemplary embodiment of the present invention with reference to accompanying drawing, above and other aspect of the present invention and advantage will become more and be readily clear of, in the accompanying drawings:

Fig. 1 is the structural representation of this Double Die Capillary Rheometer.

In figure: 1. portable plate, 2. barrel, 3. plunger, 4. long capillary, 5. kapillary back up pad, 6. plunger rod, 7. thermal insulation board, 8. barrel back up pad, 9. short capillary, 10. temperature and pressure sensor, 11. capillary conduit saddles.

Fig. 2 is the cut-open view of these Double Die Capillary Rheometer two capillaries.

Embodiment

Hereinafter, now with reference to accompanying drawing, the present invention is described more fully, various embodiment shown in the drawings.But the present invention can implement in many different forms, and should not be interpreted as being confined to embodiment set forth herein.On the contrary, it will be thorough with completely providing these embodiment to make the disclosure, and scope of the present invention is conveyed to those skilled in the art fully.

Hereinafter, exemplary embodiment of the present invention is described with reference to the accompanying drawings in more detail.

With reference to accompanying drawing 1, first add appropriate material to two barrels, heating muff heating cylinder makes material melting, driven and controlled plunger with certain speed pressing materials by servomotor leading screw, material enters kapillary and flows out, the data such as temperature, pressure under temperature and pressure sensor record, test finishes, wherein long capillary length is 20mm, and short capillary length is 10mm, and the diameter of two capillary mouth moulds is 1mm.

The foregoing is only embodiments of the invention, be not limited to the present invention.The present invention can have various suitable changes and variation.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.

Claims

1. a Double Die Capillary Rheometer, is characterized in that: critical piece has portable plate (1), two barrels (2), two plungers (3), long capillary (4), kapillary back up pad (5), plunger rod (6), thermal insulation board (7), barrel back up pad (8), short capillary (9), temperature and pressure sensor (10) and capillary conduit saddle (11).

2. the Double Die Capillary Rheometer as described in right 1, is characterized in that: described portable plate (1) upper end is connected with servomotor.

3. the Double Die Capillary Rheometer as described in right 1, is characterized in that: described two barrels (2) are around heated at constant temperature sleeves, become melt for adding thermal material.

4. the Double Die Capillary Rheometer as described in right 1, is characterized in that: it is upper that described two plungers (3) are vertically fixed on portable plate (1) by plunger rod (6), and wherein the size of plunger coordinates with the internal diameter of two barrels.

5. the Double Die Capillary Rheometer as described in right 1, is characterized in that: described long capillary (4) is 3/2～4/1 with the Length Ratio of short capillary (9).

6. the Double Die Capillary Rheometer as described in right 1, is characterized in that: described die entrance angle capillaceous 10～50.

7. the Double Die Capillary Rheometer as described in right 1, it is characterized in that: described capillary conduit saddle (11) coordinates with kapillary back up pad (5) by external thread, in the middle of capillary conduit saddle (11), there is regular hexagon through hole, wherein the external diameter of capillary conduit saddle (11) is greater than external diameter capillaceous, regular hexagon shape of through holes is less than kapillary external diameter, can make like this melt flowing out from kapillary pass through, kapillary easy for removal and installation again.

8. the Double Die Capillary Rheometer as described in right 1, it is characterized in that: described two plungers are enclosed within respectively in two barrels, described long capillary and short capillary lay respectively at the bottom of two barrels, described temperature and pressure sensor is two, lay respectively at top capillaceous, and concordant with the inwall of two barrels respectively; Wherein portable plate upper end is connected with servomotor, and two barrels are around heated at constant temperature sleeves, become melt for adding thermal material, and two plungers are vertically fixed on portable plate.