CN100464177C - Polymer vibration induced plastification extrusion rheological behavior detecting method and apparatus - Google Patents
Polymer vibration induced plastification extrusion rheological behavior detecting method and apparatus Download PDFInfo
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- CN100464177C CN100464177C CNB2005100333674A CN200510033367A CN100464177C CN 100464177 C CN100464177 C CN 100464177C CN B2005100333674 A CNB2005100333674 A CN B2005100333674A CN 200510033367 A CN200510033367 A CN 200510033367A CN 100464177 C CN100464177 C CN 100464177C
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Abstract
The invention relates to a method for measuring the polymer single bolt plasticizing rheological behavior. The measuring device comprises a single screw extractor, a capillary dies, a die-swell measuring apparatus, an electric balance, a micro controlling system, wherein the dies is fitted on the end of the extractor, the die-swell measuring apparatus and electric balance are fitted on the lower of the capillary dies and connected with the micro controlling system. The bolt can axial vibrate cyclically while rotating, and can adjust the frequency and amplitude. The method measures the polymer single bolt plasticizing rheological behavior through measuring the differential pressure, the flow rate, the die and swell, the temperature and the torsion of the bolt. The method also can be used for measuring the normal plasticizing extrusion rheological behavior.
Description
Technical field
The present invention relates to polymeric rheology performance test methods and equipment, specifically is that a kind of polymer vibration induced plastification is extruded rheology detection method and device thereof.Be mainly used in test and characterize polymers dynamic rheological property and behavior, also can be used for test and characterize polymers stable state rheological characteristics and behavior.
Background technology
Tradition stable state flow graph can be tested the stable state rheological characteristics with the characterize polymers melt, can instruct the conventional processing and forming of polymkeric substance under the friction field of force introducing condition well, but for the polymkeric substance dynamic molding processing of introducing the vibration field of force, adopt rheological data that traditional stable state flow graph records just can not be well and actual processing match, be unfavorable for the control of dynamic molding processing technology and condition.
At polymkeric substance dynamic molding machining characteristics behind the introducing vibration field of force, the sinusoidal vibration field that on the capillary flow path of conventional plunger formula stable state capillary rheometer, superposes, South China Science ﹠ Engineering University Peng Xiang side, succeeded in developing the capillary dynamic flow graph, dynamic rheological property performance by polymer melt under the discontinuous dynamic extrusion method research Vibration Force Field has obtained theory and actual effect preferably.External dynamic rheometer equipment (typical representative has DYNALYSER dynamic shear rheometer etc.), generally be on the basis of classic flat-plate or cone-plate formula rotational rheometer, by introducing the vibration realizing dynamic shearing, such dynamic rheometer mainly is to come characterize polymers viscosity and elastic property by the complex viscosity of measuring polymkeric substance.The dynamic rheological property performance data that said method obtains can't be applicable to fully that still the continuous dynamic molding of polymkeric substance behind the introducing vibration field of force is processed.This has just proposed objective requirement to the appearance of New Dynamic Rheometer, uses the dynamic rheological property extrude dynamic rheometer test and characterize polymers continuously and behavior that the dynamic molding processing of polymkeric substance is had more important theory and actual value.
Summary of the invention
The object of the present invention is to provide a kind of polymer vibration induced plastification extrusion rheological behavior detecting method, on the basis of single spiro rod plasticizing extruder, doing periodic axial vibration induced polymer plasticizing when making the screw rod rotation extrudes, use the kapillary extrusion neck ring mold, test process simulating polymer dynamic molding process, thus polymkeric substance dynamic rheological property and behavior parameter obtained.
Polymer vibration induced plastification extrusion rheological behavior detecting method of the present invention, comprise: by the additional exciter system on the single screw extrusion machine, introduce sinusoidal axial vibration at screw axial, doing periodically in the time of the screw rod rotation, the axial vibration induced polymer plastifies when extruding, measure the pressure of melt by the kapillary extrusion die and fall torque N with flow rate q, extrusion swelling D/d, melt temperature and screw rod, in order to measure and the dynamic rheological property and the behavior that characterize polymkeric substance in the screw axial vibration induced plastification extrusion.
Measure different axial vibration amplitude A of when being characterized in certain melt temperature screw rod or frequency f to melt shear stress τ capillaceous, apparent viscosity η and the first normal-stress difference τ of flowing through
1-τ
2With shear rate
Influence.
Measure when being characterized in certain melt temperature, melt-flow is through apparent viscosity η capillaceous, extrusion swelling D/d and first normal-stress difference τ
1-τ
2With the frequency f of screw axial vibration or the relation of amplitude A, frequency f changes, and then amplitude A is fixed, and vice versa.
Measure when being characterized in certain material plasticizing extrusion temperature, different screw axial vibration frequency f or amplitude A are to the influence of the relation between screw rod torque N and the screw speed n.
Measure when being characterized in certain material plasticizing extrusion temperature and screw speed, the vibration frequency f of screw rod torque N and screw rod or the relation of amplitude A, the frequency f variation, then amplitude A is constant, and vice versa.
The axial vibration amplitude A of screw rod can be zero, and promptly screw rod is not done axial vibration, measures the plastification extrusion rheological behavior with the characterize polymers routine this moment.
The device that described method is used mainly is made of single spiro rod plasticizing extruder, kapillary extrusion die, extrusion swelling measurement mechanism, electronic balance, Control System of Microcomputer; The single screw extrusion machine screw rod by the additional exciter system on the single screw extrusion machine, is introduced sinusoidal axial vibration at screw axial in rotation, the amplitude of its vibration and frequency can make things convenient for setting by the Control System of Microcomputer parameter setting system; The kapillary extrusion die is installed in single spiro rod plasticizing extruder end, and the extrusion swelling measurement mechanism is installed in kapillary extrusion die below with electronic balance and is connected with the Control System of Microcomputer signal; The data acquisition system (DAS) of Control System of Microcomputer is feedback data in real time, and can carry out the dynamic rheological property real-time analysis.
The present invention compared with prior art, its key character is by the additional exciter system on the single screw extrusion machine, introduce sinusoidal axial vibration at screw axial, doing periodically axial vibration induced polymer plasticizing in the time of the screw rod rotation extrudes, by measuring the pressure of melt by the kapillary extrusion die torque N with flow rate q, extrusion swelling D/d, melt temperature and screw rod falls, in order to measure and the dynamic rheological property and the behavior that characterize polymkeric substance in the screw axial vibration induced plastification extrusion.Its critical function has:
Can measure different axial vibration amplitude A of when being characterized in certain melt temperature screw rod or frequency f to melt shear stress τ capillaceous, apparent viscosity η and the first normal-stress difference τ of flowing through
1-τ
2With shear rate
Influence.
In the time of can measuring and be characterized in certain melt temperature, melt-flow is through apparent viscosity η capillaceous, extrusion swelling D/d and first normal-stress difference T
1-τ
2With the frequency f of screw axial vibration or the relation of amplitude A, frequency f changes, and then amplitude A is fixed, and vice versa.
In the time of can measuring and be characterized in certain material plasticizing extrusion temperature, different screw axial vibration frequency f or amplitude A are to the influence of the relation between screw rod torque N and the screw speed n.
In the time of can measuring and be characterized in certain material plasticizing extrusion temperature and screw speed, the vibration frequency f of screw rod torque N and screw rod or the relation of amplitude A, frequency f changes, and then amplitude A is constant, and vice versa.
The axial vibration amplitude A of screw rod can be zero, and promptly screw rod is not done axial vibration, and can measure the plastification extrusion rheological behavior with the characterize polymers routine this moment.
With respect to existing dynamic rheometer, the continuously dynamic extrusion molding processing of the polymkeric substance of the more approaching reality of result of the measurement of device of the present invention situation, the better dynamic extrusion molding process of simulating polymer, therefore, can instruct the dynamic molding of polymkeric substance reality to process better to the rheological characteristics of polymkeric substance dynamic molding and the test characterization result of behavior.Rheological behavior detecting method of the present invention can be used for measuring and characterize polymers melt stable state rheological property equally.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Embodiment
As shown in Figure 1, this list spiro rod plasticizing is extruded the rheology device and mainly is made of single spiro rod plasticizing extruder 1, kapillary extrusion die 2, extrusion swelling measurement mechanism 3, electronic balance 4, Control System of Microcomputer 5.Kapillary extrusion die 2 is installed in single spiro rod plasticizing extruder 1 end, and extrusion swelling measurement mechanism 3 is installed in kapillary extrusion die below with electronic balance 4 and is connected with Control System of Microcomputer 5 signals.
The single screw extrusion machine screw rod is in rotation, by the additional exciter system on the single screw extrusion machine, introduce sinusoidal axial vibration at screw axial, the amplitude A of its vibration and frequency f can make things convenient for setting (when set amplitude is zero, rheological characteristics when can be used for measuring with characterize polymers melt stable state) by Control System of Microcomputer 5 parameter setting systems.Parameter setting system by Control System of Microcomputer 5 can also be set screw speed n, polymer melt feeding section temperature T
1And pressure P
1, the compression section temperature T
2And pressure P
2, the temperature T of metering section
3And pressure P
3, extrusion temperature T
mAnd pressure P
mEtc. the polymer vibration induced machined parameters of extruding.
Data acquisition system (DAS) by Control System of Microcomputer 5 can access real-time working process parameter, and these parameters comprise the temperature T of polymer melt in three sections of the screw rods
1', T
2', T
3' and pressure P
1', P
2', P
3', the actual speed n of screw rod ' and torque N, and extrusion temperature T
m' and pressure P
m', kapillary extrusion die 2 temperature T
dControl System of Microcomputer 5 is controlled in real time according to the real-time feedback data of the data acquisition system (DAS) of setup parameter and Control System of Microcomputer, guarantee that rheological experiment can carry out under the working process parameter of setting, compare with setting experimental technique parameter, temperature error is controlled at ± and 1 ℃, pressure error is controlled at ± 0.1MP
a
In addition, melt can be measured by flow rate q capillaceous, also can melt swell D/d can be tested by extrusion swelling measurement mechanism 3 at the kapillary mouth of pipe by electronic balance 4.Kapillary flow rate q and extrusion swelling D/d can feed back to Control System of Microcomputer by the data-interface of Control System of Microcomputer 5, are used for real-time rheological characteristics analysis.
As shown in Figure 1, by device of the present invention, what we can be real-time under certain test conditions obtains
1. shear stress τ and shear rate
Relation.
2. apparent viscosity η and first normal-stress difference τ
1-τ
2With shear rate
Relation.
3. apparent viscosity η, extrusion swelling D/d and first normal-stress difference τ
1-τ
2With the frequency f of screw axial vibration or the relation of amplitude A.
4. the relation between screw rod torque N and the screw speed n.
5. the relation of the vibration frequency f of screw rod torque N and screw rod or amplitude A.
Claims (7)
1. polymer vibration induced plastification extrusion rheological behavior detecting method, it is characterized in that by the additional exciter system on the single screw extrusion machine, introduce sinusoidal axial vibration at screw axial, can do periodically axial vibration induced polymer plasticizing in the time of the screw rod rotation extrudes, by measuring the stimulate the menstrual flow pressure of kapillary extrusion die of melt torque N with flow rate q, extrusion swelling D/d, melt temperature and screw rod falls, in order to measure and the dynamic rheological property and the behavior that characterize polymkeric substance in the screw axial vibration induced plastification extrusion.
2. method according to claim 1 is characterized in that measuring different axial vibration amplitude A of when being characterized in certain melt temperature screw rod or frequency f to melt shear stress τ capillaceous, apparent viscosity η and the first normal-stress difference τ of flowing through
1-τ
2Influence with shear rate γ.
3. method according to claim 1 is characterized in that measuring when being characterized in certain melt temperature, and melt-flow is through apparent viscosity η capillaceous, extrusion swelling D/d and first normal-stress difference τ
1-τ
2With the frequency f of screw axial vibration or the relation of amplitude A, frequency f changes, and then amplitude A is fixed, and vice versa.
4. method according to claim 1, when it is characterized in that measuring and be characterized in certain material plasticizing extrusion temperature, different screw axial vibration frequency f or amplitude A are to the influence of the relation between screw rod torque N and the screw speed n.
5. method according to claim 1, when it is characterized in that measuring and be characterized in certain material plasticizing extrusion temperature and screw speed, the vibration frequency f of screw rod torque N and screw rod or the relation of amplitude A, frequency f changes, and then amplitude A is constant, and vice versa.
6. method according to claim 1 is characterized in that the axial vibration amplitude A of screw rod can be zero, and promptly screw rod is not done axial vibration, measures the plastification extrusion rheological behavior with the characterize polymers routine this moment.
7. the device of the described method use of claim 1 is characterized in that mainly being made of single spiro rod plasticizing extruder, kapillary extrusion die, extrusion swelling measurement mechanism, electronic balance, Control System of Microcomputer; The single screw extrusion machine screw rod by the additional exciter system on the single screw extrusion machine, is introduced sinusoidal axial vibration at screw axial in rotation, the amplitude of its vibration and frequency can make things convenient for setting by the Control System of Microcomputer parameter setting system; The kapillary extrusion die is installed in single spiro rod plasticizing extruder end, and the extrusion swelling measurement mechanism is installed in kapillary extrusion die below with electronic balance and is connected with the Control System of Microcomputer signal; The data acquisition system (DAS) of Control System of Microcomputer is feedback data in real time, and can carry out the dynamic rheological property real-time analysis.
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| CN100464177C true CN100464177C (en) | 2009-02-25 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101532939B (en) * | 2009-04-08 | 2011-04-27 | 大连理工大学 | Device and method for measuring steady-state extrusion viscous dissipation of micro-scale polymer fused mass |
| CN103134741B (en) * | 2011-12-01 | 2016-06-15 | 黄宇刚 | Straight-line oscillation type annular gap extruding rheometer |
| CN103499515A (en) * | 2013-09-25 | 2014-01-08 | 北京化工大学 | Method and device for testing first normal stress difference coefficient on line |
| CN106442219B (en) * | 2016-09-20 | 2018-10-23 | 北京工商大学 | A kind of screw extruder flow field characteristic test equipment |
| CN107894374B (en) * | 2017-10-23 | 2021-01-29 | 常州大学 | Capillary-rotational rheometer |
| CN110539470B (en) * | 2019-09-06 | 2021-05-07 | 青岛科技大学 | Device and method for measuring rubber viscosity in metering section of rubber extruder on line |
| CN110920027B (en) * | 2019-12-21 | 2024-06-07 | 青岛科技大学 | Polymer dynamic fluidity detection vibration device and detection method |
| CN114749501B (en) * | 2022-03-11 | 2022-12-27 | 山东泰丰钢业有限公司 | Ultrasonic cold extrusion device and extrusion process for bimetal composite material |
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| US5347851A (en) * | 1991-04-04 | 1994-09-20 | Dynisco, Inc. | Capillary rheometer plunger pressure transducer and measurement technique |
| CN1059626C (en) * | 1996-07-05 | 2000-12-20 | 华南理工大学 | Electromagnetic polymer dynamic injection forming method and apparatus thereof |
| CN1418310A (en) * | 2000-01-31 | 2003-05-14 | 博里利斯技术公司 | Method and apparatus for rheometry, and its application to control of polymer manufactupe |
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2005
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Patent Citations (4)
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|---|---|---|---|---|
| CN1025107C (en) * | 1990-03-30 | 1994-06-22 | 沈家柏 | Enzymatic production of poultry hydrolysate |
| US5347851A (en) * | 1991-04-04 | 1994-09-20 | Dynisco, Inc. | Capillary rheometer plunger pressure transducer and measurement technique |
| CN1059626C (en) * | 1996-07-05 | 2000-12-20 | 华南理工大学 | Electromagnetic polymer dynamic injection forming method and apparatus thereof |
| CN1418310A (en) * | 2000-01-31 | 2003-05-14 | 博里利斯技术公司 | Method and apparatus for rheometry, and its application to control of polymer manufactupe |
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