CN104568663A - Device and method for online measuring polymer melt rheological parameter - Google Patents
Device and method for online measuring polymer melt rheological parameter Download PDFInfo
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- CN104568663A CN104568663A CN201510007294.5A CN201510007294A CN104568663A CN 104568663 A CN104568663 A CN 104568663A CN 201510007294 A CN201510007294 A CN 201510007294A CN 104568663 A CN104568663 A CN 104568663A
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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
The present invention relates to polymer material molding manufacture field, particularly relate to a kind of device and method of on-line measurement polymer melt rheological parameter.
Background technology
The rheological property of polymkeric substance is the important technology index detecting end product quality, by carrying out scientific measurement to polymeric material rheological parameter, contributing to the rheological behaviour understanding polymkeric substance, thus obtaining excellent extrudate performance.Capillary rheometer is the instrument of at present the most ripe, the most widely used characterize polymers rheological property of development, and it can not only measure the shear viscosity of polymkeric substance, can also the extrusion of characterize polymers, and then the viscoelasticity behavior of Study Polymer Melts.But, although traditional off-line flow graph can measure various rheological data and provide necessary theoretical foundation to Polymer Processing, but its measurement result and actual processing environment still difference to some extent, actual process is instructed to there is larger otherness with it, therefore, the manufacturing of Real-Time Monitoring polymkeric substance is subject to people and payes attention to more and more widely, wherein, weighs the instrument of flow properties of polymer melts in process of manufacture at line rheometer and has wide prospect as a kind of.
Summary of the invention
The object of the invention is to the shortcoming and defect overcoming above-mentioned prior art, a kind of device and method of on-line measurement polymer melt rheological parameter is provided; True reflection melt viscosity in production line process equipment can be directly used in and, with the Changing Pattern of shear rate, overcome the problem that in prior art, measurement result and actual processing environment bring because there is difference.
The present invention is achieved through the following technical solutions:
A device for on-line measurement polymer melt rheological parameter, this device comprises temperature control equipment 10, has a storage compartment 8 in the housing of temperature control equipment 10; The top of this storage compartment 8 is for being provided with the piston section of piston 9, and the below of storage compartment 8 is polymer melt extruding zone, is disposed with multiple spaced capillary die in extruding zone from top to bottom; Pressure transducer 4 is separately installed with in the porch of each capillary die 6; The fixed block 5 for fixed capillary mouth mould 6 is provided with in the end of temperature control equipment 10.
This storage compartment 8 is by the fusion plastification section of Melt Pump 3 connecting extruder, polymer melt is incorporated in storage compartment 8 from extruder fusion plastification section by Melt Pump 3, by the extruding of piston 9, the polymer melt in storage compartment 8 is extruded successively from multiple capillary die 6.
Described multiple capillary die 6 is 3 capillary dies that diameter is identical, major diameter is different.
The top body of rod of described piston 9 is ball screw 12, and the end of the top body of rod connects servomotor 14 by gear 15,13, when servomotor 14 rotates, upwards or downwards runs at the effect lower piston 9 of ball screw 12.The displacement speed sensor 11 for detecting piston 9 downstream rate is provided with at the hypomere of ball screw 12.
Temperature control equipment 10 housing corresponding to storage compartment 8 is provided with temperature sensor 7.
The housing of extruder is provided with fusion plastification section temperature sensor 1.
Extruder fusion plastification section connects Melt Pump 3 by pipeline, and this pipeline is provided with operation valve 2.
Adopt the method for said apparatus on-line measurement polymer melt rheological parameter as:
Step one, open temp control device 10, until the reading of temperature sensor 7 is identical with the reading of extruder fusion plastification section temperature sensor 1;
Step 2, opening controlling valve 2, the polymer melt in extruder fusion plastification section is introduced in storage compartment 8 by Melt Pump 3;
Step 3, unlatching servomotor 14, control piston 9 downstream rate, the melt in storage compartment 8 is extruded from capillary die 6 by piston 9;
Polymer-melt temperature data in the polymer-melt temperature data of step 4, the polymer melt pressure data of porch of each capillary die 6 utilizing computing machine to be collected by data collecting card, piston displacement speed data, extruder fusion plastification section and storage compartment 8 carry out processing and calculating, carry out Bagley and Rabinowitsch to correct simultaneously, obtain the rheological property parameter of polymer melt;
Step 5, database in the rheological property parameter of measurement and extruder to be contrasted, then feed back in extruder control system, carry out the adjustment of technological parameter.
In described step 3, control piston 9 downstream rate, measures piston 9 speed by displacement speed sensor 11, thus obtains the shear rate calculating capillary die 6 tube wall place, measured the Pressure Drop at capillary die two ends by pressure transducer 4, thus calculate the shear stress at capillary wall place.
The present invention, relative to prior art, has following advantage and effect:
1, adopt three capillary die on-line measurements, just can carry out Bagley rectification without the need to changing capillary die, three shear viscosity values can be measured simultaneously and average as final measured value to three values, reduce the impact of test error.
2, the instantaneous stretching viscosity of Cogswell technique study polymer melt can be utilized.
3, on-line equipment and extruder form closed-loop control system, can realize Automatic Control.
4, replaceable capillary die carries out polymer melt wall slip phenomenal research.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the close-up schematic view of capillary die.
Fig. 3 is polymer melt rheological parameter measurement frame figure;
In figure: V-piston speed; △ P-Pressure Drop; L/D-length-diameter ratio;
-apparent shear rate;
-true shear rate; τ
w-true shear stress; η
w-true shear viscosity;
-rate of extension; η
e-elongational viscosity; u
s-wall slip speed.
Embodiment
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figures 1 to 3.The device of on-line measurement polymer melt rheological parameter of the present invention, this device comprises temperature control equipment 10, has a storage compartment 8 in the housing of temperature control equipment 10; The top of this storage compartment 8 is for being provided with the piston section of piston 9, and the below of storage compartment 8 is polymer melt extruding zone, is disposed with multiple spaced capillary die in extruding zone from top to bottom; Pressure transducer 4 is separately installed with in the porch of each capillary die 6;
This storage compartment 8 is by the fusion plastification section of Melt Pump 3 connecting extruder, polymer melt is incorporated in storage compartment 8 from extruder fusion plastification section by Melt Pump 3, by the extruding of piston 9, the polymer melt in storage compartment 8 is extruded successively from multiple capillary die 6.
Described multiple capillary die 6 is 3 capillary dies that diameter is identical, major diameter is different.
The top body of rod of described piston 9 is ball screw 12, and the end of the top body of rod connects servomotor 14 by gear 15,13, when servomotor 14 rotates, upwards or downwards runs at the effect lower piston 9 of ball screw 12.
The displacement speed sensor 11 for detecting piston 9 downstream rate is provided with at the hypomere of ball screw 12.
The fixed block 5 for fixed capillary mouth mould 6 is provided with in the end of temperature control equipment 10.
Temperature control equipment 10 housing corresponding to storage compartment 8 is provided with temperature sensor 7.
The housing of extruder is provided with fusion plastification section temperature sensor 1.
Extruder fusion plastification section connects Melt Pump 3 by pipeline, and this pipeline is provided with operation valve 2.
Requirement according to measuring can drive servomotor 14 carry out the decline rate of regulating piston 9 thus make shear rate within the scope required; Polymer melt flows through three capillary dies with the different length-diameter ratio of diameter simultaneously can carry out Bagley and Rabinowitsch correction fast, thus obtains the true shear viscosity of polymer melt; The instantaneous stretching viscosity of Cogswell technique study polymer melt can be utilized; Capillary die can be replaced by the mouth mould of the identical length-diameter ratio of different-diameter according to the needs of research, verify whether polymer melt extrusion exists wall slip phenomenon according to Mooney theory.
This device forms closed-loop control system by computing machine and extruder, utilize the parameters such as data collecting card collection, displacement, speed, pressure, temperature, undertaken processing by the data of computing machine to collection and calculate, database in calculated value and extruder is contrasted, then feed back in extruder control system, carry out the adjustment of correlation parameter, make process be in optimum machining state.
The method of on-line measurement polymer melt rheological parameter realizes by following steps:
Step one, open temp control device 10, until the reading of temperature sensor 7 is identical with the reading of extruder fusion plastification section temperature sensor 1;
Step 2, opening controlling valve 2, the polymer melt in extruder fusion plastification section is introduced in storage compartment 8 by Melt Pump 3;
Step 3, unlatching servomotor 14, control piston 9 downstream rate, the melt in storage compartment 8 is extruded from capillary die 6 by piston 9;
Polymer-melt temperature data in the polymer-melt temperature data of step 4, the polymer melt pressure data of porch of each capillary die 6 utilizing computing machine to be collected by data collecting card, piston displacement speed data, extruder fusion plastification section and storage compartment 8 carry out processing and calculating, carry out Bagley and Rabinowitsch to correct simultaneously, obtain the rheological property parameter of polymer melt;
Step 5, database in the rheological property parameter of measurement and extruder to be contrasted, then feed back in extruder control system, carry out the adjustment of technological parameter.
In described step 3, control piston 9 downstream rate, measures piston 9 speed by displacement speed sensor 11, thus obtains the shear rate calculating capillary die 6 tube wall place, measured the Pressure Drop at capillary die two ends by pressure transducer 4, thus calculate the shear stress at capillary wall place.
As mentioned above, just the present invention can be realized preferably.
Embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. a device for on-line measurement polymer melt rheological parameter, is characterized in that: this device comprises temperature control equipment (10), has a storage compartment (8) in the housing of temperature control equipment (10); The top of this storage compartment (8) is for being provided with the piston section of piston (9), and the below of storage compartment (8) is polymer melt extruding zone, is disposed with multiple spaced capillary die in extruding zone from top to bottom; Pressure transducer (4) is separately installed with in the porch of each capillary die (6);
This storage compartment (8) is by the fusion plastification section of Melt Pump (3) connecting extruder, polymer melt is incorporated in storage compartment (8) from extruder fusion plastification section by Melt Pump (3), by the extruding of piston (9), the polymer melt in storage compartment (8) is extruded successively from multiple capillary die (6).
2. device according to claim 1, is characterized in that: described multiple capillary die (6) is 3 capillary dies that diameter is identical, major diameter is different.
3. device according to claim 1 and 2, it is characterized in that: the top body of rod of described piston (9) is ball screw (12), the end of the top body of rod connects servomotor (14) by gear (15,13), when servomotor (14) rotates, upwards or downwards run at the effect lower piston (9) of ball screw (12).
4. device according to claim 3, is characterized in that: be provided with the displacement speed sensor (11) for detecting piston (9) downstream rate at the hypomere of ball screw (12).
5. device according to claim 3, is characterized in that: be provided with the fixed block (5) for fixed capillary mouth mould (6) in the end of temperature control equipment (10).
6. device according to claim 3, is characterized in that: on temperature control equipment (10) housing corresponding to storage compartment (8), be provided with temperature sensor (7).
7. device according to claim 3, is characterized in that: on the housing of extruder, be provided with fusion plastification section temperature sensor (1).
8. device according to claim 3, is characterized in that: extruder fusion plastification section connects Melt Pump (3) by pipeline, and this pipeline is provided with operation valve (2).
9. adopt the method for device on-line measurement polymer melt rheological parameter according to any one of claim 1 to 7, it is characterized in that following steps:
Step one, open temp control device (10), until the reading of temperature sensor (7) is identical with the reading of extruder fusion plastification section temperature sensor (1);
Step 2, opening controlling valve (2), the polymer melt in extruder fusion plastification section is introduced in storage compartment (8) by Melt Pump (3);
Step 3, unlatching servomotor (14), control piston (9) downstream rate, the melt in storage compartment (8) is extruded from capillary die (6) by piston (9);
Polymer-melt temperature data in the polymer-melt temperature data of step 4, the polymer melt pressure data of porch of each capillary die (6) utilizing computing machine to be collected by data collecting card, piston displacement speed data, extruder fusion plastification section and storage compartment (8) carry out processing and calculating, carry out Bagley and Rabinowitsch to correct simultaneously, obtain the rheological property parameter of polymer melt;
Step 5, database in the rheological property parameter of measurement and extruder to be contrasted, then feed back in extruder control system, carry out the adjustment of technological parameter.
10. method according to claim 9, it is characterized in that: in described step 3, control piston (9) downstream rate, piston (9) speed is measured by displacement speed sensor (11), thus obtain the shear rate calculating capillary die (6) tube wall place, measured the Pressure Drop at capillary die two ends by pressure transducer (4), thus calculate the shear stress at capillary wall place.
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| CN105547920A (en) * | 2015-12-10 | 2016-05-04 | 北京理工大学 | Right-angle type mould used for torque rheological testing |
| CN105675443A (en) * | 2016-02-29 | 2016-06-15 | 太原工业学院 | Single-feed-cylinder capillary rheometer |
| CN106248525A (en) * | 2016-09-27 | 2016-12-21 | 华南理工大学 | The flow measurement device of a kind of accurate flow control and measuring method |
| CN106248528A (en) * | 2016-09-27 | 2016-12-21 | 中国石油天然气股份有限公司 | Method for evaluating elasticity of polymer |
| CN106596334A (en) * | 2016-12-08 | 2017-04-26 | 哈尔滨工业大学 | Tensile shear rheometer and method for testing rheological properties of alloy solid-liquid two-phase region by using tensile shear rheometer |
| CN106769660A (en) * | 2016-11-09 | 2017-05-31 | 北京工业大学 | A kind of rheological characteristic on-line analysis system |
| CN106769670A (en) * | 2017-02-27 | 2017-05-31 | 华南理工大学 | A kind of disk draft flowing deformation method of testing and device |
| CN107490529A (en) * | 2016-06-13 | 2017-12-19 | 北京化工大学 | A kind of multistage partial pressure type capillary rheometer |
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| AT518911A1 (en) * | 2016-07-18 | 2018-02-15 | Erema Eng Recycling Maschinen & Anlagen Gmbh | Method and apparatus for the on-line determination of the viscosity of a polymer |
| CN107953526A (en) * | 2017-11-29 | 2018-04-24 | 华南理工大学 | A kind of full-automatic online sample preparation device on extruding production line |
| CN107995947A (en) * | 2015-06-08 | 2018-05-04 | 莱斯特瑞兹塑料挤出机有限责任公司 | Measurement nozzle for the tensile viscosity for determining polymer melt |
| CN108709828A (en) * | 2018-03-30 | 2018-10-26 | 四川大学 | The rotary extrusion processing rheometer and flow measurement method of polyalcohol pressure/shear rheology can be measured simultaneously |
| CN109916777A (en) * | 2019-03-31 | 2019-06-21 | 华南理工大学 | Mountable cylinder type rotational rheometer device and its application method in the production line |
| CN110455684A (en) * | 2019-07-31 | 2019-11-15 | 湖南工业大学 | A kind of online rheological behavior test device of non-newtonian fluid |
| CN111398081A (en) * | 2020-04-23 | 2020-07-10 | 广州华新科智造技术有限公司 | Online detection device and method for melt index of high molecular polymer |
| WO2024045398A1 (en) * | 2022-09-02 | 2024-03-07 | 南方电网科学研究院有限责任公司 | Granulation method and device for crosslinked polyethylene cable insulating material having voltage grade of 500 kv or more |
| WO2024087330A1 (en) * | 2022-10-28 | 2024-05-02 | 南方电网科学研究院有限责任公司 | High-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus |
| AT526633A1 (en) * | 2022-11-07 | 2024-05-15 | Engel Austria Gmbh | Measuring arrangement for an injection molding machine |
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| CN105547920A (en) * | 2015-12-10 | 2016-05-04 | 北京理工大学 | Right-angle type mould used for torque rheological testing |
| CN105547920B (en) * | 2015-12-10 | 2018-12-07 | 北京理工大学 | Torque rheology test perpendicular type mold |
| CN105675443A (en) * | 2016-02-29 | 2016-06-15 | 太原工业学院 | Single-feed-cylinder capillary rheometer |
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| CN111398081A (en) * | 2020-04-23 | 2020-07-10 | 广州华新科智造技术有限公司 | Online detection device and method for melt index of high molecular polymer |
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Application publication date: 20150429 |