CN107843524A - A kind of online Viscosity Monitoring method of low-melting point polyester polymeric kettle - Google Patents
A kind of online Viscosity Monitoring method of low-melting point polyester polymeric kettle Download PDFInfo
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- CN107843524A CN107843524A CN201711354924.1A CN201711354924A CN107843524A CN 107843524 A CN107843524 A CN 107843524A CN 201711354924 A CN201711354924 A CN 201711354924A CN 107843524 A CN107843524 A CN 107843524A
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- point polyester
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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- General Health & Medical Sciences (AREA)
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Abstract
A kind of online Viscosity Monitoring method of low-melting point polyester polymeric kettle, is made up of two parts.Part I, it is made up of, Part II, is made up of agitator and stirring motor agitating shaft and torsion cylinder.Low-melting point polyester system is in polymerization initial stage, and viscosity is relatively low, and polymerization system viscosity is monitored by second of above-mentioned method for detecting viscosity, reads the size of current of stirring motor, is converted to corresponding viscosity.Polymerization reaction late stage, stirring motor size of current reduces to PET conglutination change sensitivity, but it polymerize the later stage with the increase of polymer molecular weight, there is bag axle effect, liquid near agitating shaft climbs along agitating shaft, gap between the Part I torsion cylinder and agitating shaft of above-mentioned method for detecting viscosity is full of low-melting point polyester melt, and the instruction device on the torsion cylinder indicates scale, is converted to corresponding viscosity.The present invention, polyester system viscosity can be monitored on-line to the reaction process that low-melting point polyester polymerize, it is simpler compared to online Viscosity Monitoring apparatus structure described in other monitoring methods, reliably.
Description
Technical field
The present invention relates to a kind of online Viscosity Monitoring method, and in particular to a kind of the online of low-melting point polyester polymeric kettle is glued
Spend detection method.
Background technology
Low-melting point polyester refers to more molten than normal polyester (polyethylene terephthalate, PET, abbreviation polyester)
The low modified poly ester general name of point, fusing point is typically below 240 DEG C.The materials such as filter, non-woven fabrics can be prepared, particularly can be with
Prepare the nonwoven cloth material for vehicle noise insulation pad.
In polyester polymerization process, its molecular size range is one of main index, and molecular weight has corresponding relation with viscosity,
The bigger viscosity of usual molecular weight is bigger.Viscosity measurement simultaneously plays important to the motion state for understanding fluid properties and Study of Fluid
Effect.The viscosity of on-line checking fluid is frequently necessary in Practical Project and pilot plant test, to ensure optimal process operation
Environment and product quality, so as to improve productivity effect.Come in polyester polymerization process often through the viscosity of monitoring reaction system
Monitoring molecular size range is with judging reaction end.
At present, in the viscosity in monitoring polymerization system, sampling and testing is largely needed, on-line real time monitoring is inconvenient,
Existing viscosimeter structure is complex, in small-sized tank reactor, and can not fully meet the requirement of on-line monitoring.
The content of the invention
It is an object of the invention to provide a kind of theory structure is simple, highly reliable low-melting point polyester polymerisation
Line Viscosity Monitoring method, meet needs of the small-sized polymerization kettle to the on-line monitoring of polyester system viscosity.
To achieve the above object, the present invention provides a kind of on-line monitoring method of low-melting point polyester polymerization system viscosity such as
Under：
Viscosity Monitoring method provided by the present invention is made up of two parts.
The Part I of the Viscosity Monitoring method, is made up of agitating shaft and torsion cylinder.Viscosity measurements principle is based on rotating cylinder
The principle of method viscosimetric analysis, utilize two coaxial cylinders（One of cylinder is rotor）Between shear current difference and the shear of liquid should
Relation between power carrys out quantitative measurment liquid viscosity.The rotor of viscosity detecting device, institute are used as by the use of the agitating shaft in polymeric kettle
It is torsion cylinder to state rotor periphery and set the coaxial cylinders of a fixed-area, and the torsion cylinder is surveyed by the torsion with elastic component
Amount device is fixed.
The Part II of the Viscosity Monitoring method, is made up of agitator and stirring motor.With polymerization system molecular weight
Increase, the viscosity of polymerization system also rises therewith, and stirring motor power or electric current, into corresponding proportionate relationship, pass through with viscosity
Size of current during stirring motor stirring is measured, system viscosity can be reflected.
Low-melting point polyester system is in polymerization initial stage, and viscosity is relatively low, and polymerization system viscosity passes through above-mentioned Viscosity Monitoring method
Second is monitored, and reads the size of current of stirring motor, is converted to corresponding viscosity.Polymerization reaction late stage is with polymer
, there is bag axle effect in the increase of molecular weight, and the liquid near agitating shaft climbs along agitating shaft, and the of above-mentioned Viscosity Monitoring method
Gap between a part of torsion cylinder and agitating shaft is full of low-melting point polyester melt, and the instruction device on the torsion cylinder indicates
Scale, be converted to corresponding viscosity.
By using above-mentioned technical proposal, the whole reaction process that low-melting point polyester polymerize can be monitored on-line, intuitively
The viscosity for showing low-melting point polyester, reflect the molecular size range of polymerization system, compared to viscosity described in other monitoring methods
Monitoring method is simple, reliable and precision is high.
Brief description of the drawings
A kind of online Viscosity Monitoring schematic device of low-melting point polyester polymeric kettles of Fig. 1.
In figure：1- torsion cylinders fix pillar；2- position adjustments posts；3- horizontal circles；4- elastic components；5- torsion cylinders；6-
Agitating shaft；7- graduated scales；8- pointers；9- agitators；10- stirring motors.
Embodiment
In order to be preferably described in further detail to the present invention, illustrate with reference to the drawings and specific embodiments.Below
Embodiment is used to illustrate the present invention, but is not limited to the scope of the invention.
Embodiment 1
A kind of low-melting point polyester polymerize online Viscosity Monitoring method：
Viscosity Monitoring method provided by the present invention is made up of two parts, the Part I of the Viscosity Monitoring method, by stirring
Mix axle 6 and torsion cylinder 5 forms, the Part II of the Viscosity Monitoring method, be made up of agitator 9 and stirring motor 10.
Polymerization system polymerize early stage, and viscosity is relatively low, using the size of current of amperometric measurement stirring motor 10 so as to being gathered
Close system viscosity.In the case where specifying the rotating speed of agitator 9 viscosity and the size of current of stirring motor 10 are established with the liquid of known-viscosity
Relation, draw out electric current-viscograph.Low-melting point polyester agitator 9 in polymerisation uses identical rotating speed, now with stirring
Mix the viscosity number of the i.e. available now polymerization system of the size of current of motor 10 control electric current-viscograph.
Polymerization system polymerize the later stage, and viscosity increase, the size of current of stirring motor 10 is to PET conglutination change sensitivity drop
It is low, but polymerization reaction late stage is with the increase of polymer molecular weight, there is bag axle effect, the liquid near agitating shaft 6 is along stirring
Mix axle 6 to climb, the gap between torsion cylinder 5 and agitating shaft 6 is hydraulically full.Agitating shaft 6 serves as rotor, and viscosity is not under same rotating speed
Together, the moment of torsion being reflected on torsion cylinder 5 is different, and the scale that pointer 8 indicates on dial 3 is also different.R1, R2 and L are in Fig. 1
Constant, the coefficient of elasticity that four elastic components 4 are acted on torsion cylinder 5 are determination value, and the control rotating speed can of agitating shaft 6 passes through sight
The deflection situation of pointer 8 is surveyed so as to measure the viscosity of polyester system.The liquid of known-viscosity is used in the case where specifying the rotating speed of agitating shaft 6
The relation of viscosity and the deflection angle of pointer 8 is established, draws out deflection angle-viscograph.Polyester agitating shaft 6 in polymerisation
Using identical rotating speed, now with the i.e. available now PET conglutination of the deflection angle of pointer 8 control deflection angle-viscograph
Value.
Claims (3)
1. a kind of low-melting point polyester polymerize online Viscosity Monitoring method, it is characterised in that：The Viscosity Monitoring method includes two portions
Point, the line Viscosity Monitoring method Part I is made up of agitating shaft and torsion cylinder, the line Viscosity Monitoring method Part II
It is made up of agitator and stirring motor.
2. a kind of low-melting point polyester polymerize online Viscosity Monitoring method according to claim 1, it is characterised in that：Described first
Part is using agitating shaft and torsion cylinder in low-melting point polyester polymerization later stage measurement polymerization system viscosity.
3. a kind of low-melting point polyester polymerize online Viscosity Monitoring method according to claim 1, it is characterised in that：Described second
Part monitors measurement polymerization system viscosity early stage in low-melting point polyester polymerization by measuring stirring motor electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711354924.1A CN107843524A (en) | 2017-12-15 | 2017-12-15 | A kind of online Viscosity Monitoring method of low-melting point polyester polymeric kettle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711354924.1A CN107843524A (en) | 2017-12-15 | 2017-12-15 | A kind of online Viscosity Monitoring method of low-melting point polyester polymeric kettle |
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| Publication Number | Publication Date |
|---|---|
| CN107843524A true CN107843524A (en) | 2018-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711354924.1A Withdrawn CN107843524A (en) | 2017-12-15 | 2017-12-15 | A kind of online Viscosity Monitoring method of low-melting point polyester polymeric kettle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337189A (en) * | 2020-10-19 | 2021-02-09 | 浙江华基环保科技有限公司 | Garbage incineration flue gas dedusting filter material and processing method thereof |
-
2017
- 2017-12-15 CN CN201711354924.1A patent/CN107843524A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337189A (en) * | 2020-10-19 | 2021-02-09 | 浙江华基环保科技有限公司 | Garbage incineration flue gas dedusting filter material and processing method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180327 |
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| WW01 | Invention patent application withdrawn after publication |