CN114544433A - High molecular solution viscosity on-line measuring device - Google Patents
High molecular solution viscosity on-line measuring device Download PDFInfo
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- CN114544433A CN114544433A CN202210116226.2A CN202210116226A CN114544433A CN 114544433 A CN114544433 A CN 114544433A CN 202210116226 A CN202210116226 A CN 202210116226A CN 114544433 A CN114544433 A CN 114544433A
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- 238000005259 measurement Methods 0.000 description 11
- 229920002284 Cellulose triacetate Polymers 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 8
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- -1 cellulose triacetate ester Chemical class 0.000 description 2
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- 239000002861 polymer material Substances 0.000 description 2
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- WGLUMOCWFMKWIL-UHFFFAOYSA-N dichloromethane;methanol Chemical compound OC.ClCCl WGLUMOCWFMKWIL-UHFFFAOYSA-N 0.000 description 1
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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
The present disclosure relates to a polymer solution viscosity measuring device including: a support portion; a motor installed on the support part; the first end of the torque sensor is combined with the output shaft of the motor; the input end of the transmission device is combined with the second end of the torque sensor; the first end of the stirring device is combined with the second end of the transmission device, and the second end of the stirring device is inserted into the polymer solution to be tested; the viscosity change of the polymer solution is determined based on the torque change output by the torque sensor and the transmission ratio of the transmission device so as to represent the dissolving process of the polymer solution. The polymer solution viscosity measuring device reflects the change of stirring resistance to the torque sensor through synchronous belt transmission, thereby representing the dissolving process of the polymer solution and realizing dynamic monitoring. The measuring device disclosed by the invention can ensure the reliability of data acquisition when the experimental parameters change, and accurately judge the influence of the experimental conditions such as formula, temperature and pressure on the dissolution of the polymer solution.
Description
Technical Field
The disclosure relates to the technical field of viscosity rheometers, in particular to a high-molecular solution viscosity on-line measuring device.
Background
In practical engineering and industrial production of polymer solution processing, the viscosity of a fluid is often required to be detected on line so as to ensure the optimal process operation environment and product quality, thereby improving the production benefit. Through the on-line measurement of the liquid viscosity in the process, the data of the liquid rheological behavior can be obtained, which has important guiding values for adjusting the process control of the product process, adjusting the delivery property of the high molecular fluid and the operability of the solution product forming.
The dissolution of polymeric materials is a slow process, generally involving two stages of swelling and dissolution, due to the large difference in the sizes of the long-chain polymer and solvent molecules, which results in different diffusion rates. Since the solvent molecules permeate into the polymer material at a high rate, but the polymer molecules diffuse into the solvent at a low rate, so that the solvent molecules penetrate into the gaps between the polymer molecular chains, and the solvent molecules are mixed with certain 'chain segments' of the polymer, thereby expanding the volume of the polymer-swelling (swelling). Secondly, with the continuous penetration of solvent molecules, the gaps among polymer molecular chains are increased, and the penetrated solvent molecules can also solvate the polymer chains, thereby weakening the interaction among the polymer chains and mixing and dissolving the whole polymer and the solvent (dissolution). Viscosity is an important physical parameter for measuring the ability of a polymer liquid to resist flow throughout the dissolution process. The measurement of viscosity is an important means of detecting flow conditions, improving dissolution efficiency, controlling industrial processes and ensuring product quality.
However, the actual processing conditions of the polymer solution usually involve high temperature and high pressure, and it is not feasible to directly perform a large amount of viscosity test experiments on the dissolution production line, so it is necessary to change the dissolution conditions to simulate the viscosity change process of the online dissolution on the basis of a laboratory, and a viscosity change curve is obtained to guide the model selection and process parameters of large dissolution equipment.
Disclosure of Invention
In view of the above, the present disclosure provides a polymer solution viscosity measuring device to solve at least one of the above and other technical problems.
In order to achieve the above object, according to one aspect of the present disclosure, there is provided a polymer solution viscosity measuring apparatus including: a support portion; a motor installed on the support part; the first end of the torque sensor is combined with the output shaft of the motor; the input end of the transmission device is combined with the second end of the torque sensor; the first end of the stirring device is combined with the second end of the transmission device, and the second end of the stirring device is inserted into the polymer solution to be tested; the viscosity change of the polymer solution is determined based on the torque change output by the torque sensor and the transmission ratio of the transmission device so as to represent the dissolving process of the polymer solution.
According to an embodiment of the present disclosure, a transmission includes: a first pulley coupled to the second end of the torque sensor; a second belt wheel combined with the first end of the stirring device; and the synchronous belt is suitable for connecting the first belt wheel and the second belt wheel, and the transmission ratio is the diameter ratio of the second belt wheel to the first belt wheel. According to the embodiment of the present disclosure, the polymer solution viscosity measuring apparatus further includes: a dissolving kettle, wherein the polymer solution is contained in the dissolving kettle; the sealing cover is hermetically combined on the dissolving kettle, and the stirring device penetrates through the sealing cover and extends into the polymer solution in the dissolving kettle; and a pressure adjusting mechanism adapted to change the pressure in the dissolution vessel. Preferably, the pressure adjusting mechanism includes: the gas inlet pipeline is connected to the sealing cover so as to convey gas with pressure into the dissolving kettle; and an exhaust line connected to the sealing cap to exhaust gas from the dissolving tank, the intake line and the exhaust line cooperating to regulate pressure within the dissolving tank.
According to the embodiment of the present disclosure, the polymer solution viscosity measuring apparatus further includes: the temperature adjusting mechanism is suitable for changing the temperature of the polymer solution in the dissolving kettle. Preferably, the temperature adjustment mechanism includes: the water inlet pipeline is connected to the sealing cover so as to convey cooling water to the cooling pipeline on the kettle wall of the dissolving kettle; and a drain line connected to the sealing cover to discharge cooling water in the cooling line on the kettle wall of the dissolution kettle, the water inlet line and the drain line cooperating to regulate the temperature of the polymer solution in the dissolution kettle.
According to an embodiment of the present disclosure, a sealing cap is screw-coupled to the dissolution vessel. Preferably, the sealing cap is provided with a handle adapted to rotate the sealing cap.
According to an embodiment of the present disclosure, the support portion includes: a column; the first connecting seat is installed on the dissolving kettle, and the stand supporting part and the motor are installed on the first connecting seat. Preferably, the first coupling seat comprises: the main body part is provided with a stand column, and the other end of the stand column is detachably connected to the dissolving kettle; and a first connection plate integrally connected to the main body portion, the motor being mounted on the first connection plate.
According to an embodiment of the present disclosure, the support part further includes: and the second connecting seat and the torque sensor are arranged on the stand column through the second connecting seat. Preferably, the second connection holder includes: the torque sensor is arranged on the mounting frame; and at least one connecting frame, wherein the mounting frame is detachably arranged on the upright post through the connecting frame.
According to the embodiment of the disclosure, the polymer solution viscosity measuring device further comprises two couplers which are respectively arranged on two sides of the torque sensor and used for connecting the motor and the torque sensor, and the shaft rod and the torque sensor of the first belt wheel.
According to an embodiment of the present disclosure, the support portion further includes a third connection plate fixed to an upper end of the pillar of the support portion by a fixing member, and the shaft is rotatably inserted into the third connection plate.
Preferably, a bearing assembly is arranged in the third connecting plate, the shaft rod is mounted to the third connecting plate through the bearing assembly, and a bearing cover is arranged on the third connecting plate and is suitable for locking the bearing assembly in the third connecting plate.
According to an embodiment of the present disclosure, the tension degree of the timing belt can be adjusted by the rotation of the support portion.
According to the polymer solution viscosity measuring device of the embodiment of the disclosure, the change of stirring resistance is reflected to the torque sensor through synchronous belt transmission, so that the dissolving process of the polymer solution is represented, and dynamic monitoring is realized. The device for measuring the viscosity of the polymer solution can ensure the reliability of data acquisition when the experimental parameters change, and accurately judge the influence of the experimental conditions such as formula, temperature and pressure on the dissolution of the polymer solution.
Drawings
Fig. 1 is a schematic perspective view of a polymer solution viscosity measuring device according to an embodiment of the present disclosure;
FIG. 2a is a front view of the polymer solution viscosity measuring device shown in FIG. 1;
FIG. 2b is a cross-sectional view of FIG. 2a taken along section line D-D;
FIG. 3 is a plan view of the polymer solution viscosity measuring device shown in FIG. 1;
fig. 4 is a schematic perspective view of a measurement unit of the polymer solution viscosity measurement device according to the embodiment of the present disclosure;
FIG. 5 is a schematic of the viscosity change of a cellulose triacetate ester dissolution process of an embodiment of the disclosure; and
FIG. 6 is a schematic representation of the change in viscosity of the cellulose triacetate of FIG. 5 over 0-1 h.
Description of the reference numerals
1 support part
11 column
12 first connecting seat
121 main body part
122 first connecting plate
13 second connecting seat
131 mounting frame
132 connecting frame
14 third connecting plate
141 fastener
142 bearing cap
2 electric machine
3 Torque sensor
4 driving device
41 first pulley
411 shaft lever
42 second pulley
43 synchronous belt
5 stirring device
6 dissolving kettle
7 sealing cover
71 handle
8 adjustment mechanism
81 pressure regulating mechanism
811 air inlet pipe
812 exhaust pipeline
82 temperature regulating mechanism
821 water inlet pipeline
822 drain line
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Concentrated solutions and suspensions of high molecular polymers are generally non-newtonian fluids, such as cellulose esters, polyethylene, polyacrylamide, polyvinyl chloride, nylon 6, PVS, celluloid, dacron, rubber solutions, various engineering plastics, melts and solutions of chemical fibers, and the like, which are all non-newtonian fluids. non-Newtonian fluids, are fluids that do not satisfy the experimental laws of Newtonian viscosity, i.e., fluids whose shear stress and shear strain rate are not linear. For a fluid that complies with newtonian law of viscosity, the following is defined: two fluids in different planes but parallel, having the same area A, separated by a distance dx and at different flow rates V1And V2Flow in the same direction, newton assumes that the shear stress to maintain this different flow rate is proportional to the relative velocity or velocity gradient of the fluid, i.e.: τ ═ η × dv/dx ═ η K. K ═ dv/dx(s)-1) For shear strain rate, τ (N/m)2) To apply shear stress per unit area of the liquid layer, where η is viscosity, which is related to the fluid properties. In other words, the two blocks are 1m in area2The plate (2) was immersed in a liquid at a distance of 1m, and when a shear stress of 1N was applied to one plate so that the relative velocity between the plates became 1m/s, the viscosity of the liquid became 1 pas. Although the polymer solution is a non-Newtonian fluid, that is, the shear stress and the shear rate are not in a linear relationship, the viscosity is a constant value at the same temperature when the polymer solution finally reaches a steady state due to the property that the viscosity changes at any moment in the dissolving process of the polymer solution, so that the viscosity can be used as a parameter for measuring the change of the whole solution dissolving process.
The dissolving process of the high polymer material is a dynamic balance process, and the viscosity is a parameter which changes constantly, so that a torque sensor is connected to express the change of the viscosity of the high polymer solution. The polymer solution viscosity measuring device with the rotation measuring system comprises a torque measuring type (constant rotating speed) and a rotating speed measuring type (constant rotating speed).
According to the general inventive concept of an aspect of the present disclosure, there is provided a polymer solution viscosity measuring apparatus including: a support portion; a motor mounted on the support portion; a torque sensor, wherein a first end of the torque sensor is coupled to an output shaft of the motor; the input end of the transmission device is combined with the second end of the torque sensor; and the first end of the stirring device is combined with the second end of the transmission device, and the second end of the stirring device is inserted into the polymer solution to be detected. The viscosity change of the polymer solution is determined based on the torque change output by the torque sensor and the transmission ratio of the transmission device so as to represent the dissolving process of the polymer solution.
The parameter value output by the torque sensor is the output voltage, and the larger the viscosity of the polymer solution is, the larger the torque is, and the larger the output voltage is. Defining the initial torque corresponding to the viscosity to be 0; when the dissolution reaches the balance, at a constant dissolution temperature and a given constant motor speed, the speed gradient of the liquid layer at any point in the direction perpendicular to the liquid flow velocity is shown as a constant, namely, the viscosity reaches the balance, so that the viscosity reaches the balance, the output voltage at the moment is also a fixed value, the temperature at the moment is recorded, the viscosity value of the solution at the moment is tested corresponding to a standard viscometer, the torque and the viscosity change in the whole process are in a positive correlation, and the corresponding relationship of the torque and the viscosity is established. The data change of the whole dissolving process can be captured in real time through the amplifier, the data acquisition card and other devices, which is beneficial to judging which formula design and processing condition reach a stable value, and the detection of dynamic change has practical significance.
Therefore, in the polymer solution viscosity measuring device, the change of stirring resistance is reflected to the torque sensor through the transmission of the transmission device, and the viscosity change of the polymer solution is determined based on the torque change output by the torque sensor and the transmission ratio of the transmission device, so that the dissolution process of the polymer solution is represented, and dynamic monitoring is realized. The device for measuring the viscosity of the polymer solution can ensure the reliability of data acquisition when the experimental parameters change, and accurately judge the influence of the experimental conditions such as formula, temperature and pressure on the dissolution of the polymer solution, thereby improving the dissolution efficiency by changing the process parameters, providing data support for the actual industrial production and improving the film forming quality.
The technical solution of the present disclosure will be described in detail below with reference to specific examples. It should be noted that the following specific examples are only for illustration and are not intended to limit the disclosure.
Fig. 1 is a schematic perspective view of a polymer solution viscosity measurement device according to an embodiment of the present disclosure; FIG. 2a is a front view of the polymer solution viscosity measuring device shown in FIG. 1; FIG. 2b is a cross-sectional view of FIG. 2a taken along section line D-D; FIG. 3 is a plan view of the polymer solution viscosity measuring apparatus shown in FIG. 1; fig. 4 is a schematic perspective view of a measurement unit of the polymer solution viscosity measurement device according to the embodiment of the present disclosure.
As shown in fig. 2a and 2b, the polymer solution viscosity measuring apparatus is a vertical type measuring unit externally connected to the polymer solution dissolving tank and the sidewall thereof. In addition, fig. 2b is a cross-sectional view taken along the cross-sectional line D-D of fig. 2a, schematically showing the internal structure of the polymer solution dissolving tank, wherein one end of the stirring device 5 is outside the dissolving tank, the second pulley 42 thereon is connected with the first pulley 41 in the measuring unit of the polymer solution viscosity measuring device through the synchronous belt 43, and the other end is a stirring paddle blade, which is inserted into the polymer solution in the dissolving tank to stir and dissolve the polymer solution sufficiently.
As shown in fig. 1 and 4, an embodiment of the present disclosure provides a polymer solution viscosity measuring apparatus including: a support part 1; a motor 2 mounted on the support 1; a torque sensor 3, wherein a first end of the torque sensor 3 is coupled with an output shaft of the motor 2; a transmission device 4, wherein the input end of the transmission device 4 is combined with the second end of the torque sensor 3; and the first end of the stirring device 5 is combined with the second end of the transmission device 4, and the second end of the stirring device 5 is inserted into the polymer solution to be detected. Wherein, the viscosity change of the polymer solution is determined based on the torque change output by the torque sensor 3 and the transmission ratio of the transmission device 4, so as to characterize the dissolving process of the polymer solution.
As shown in fig. 3, the positional relationship among the first pulley, the second pulley, and the timing belt can be seen in a plan view of the polymer solution viscosity measuring apparatus, and the connecting action of the timing belt to the first pulley and the second pulley can be clearly observed with reference to fig. 3.
According to an embodiment of the present disclosure, the transmission 4 includes: a first pulley 41 coupled to a second end of the torque sensor 3; a second pulley 42 coupled to a first end of the stirring device 5; and a timing belt 43 for connecting the first pulley 41 and the second pulley 42.
According to above-mentioned polymer solution viscosity measurement device of this disclosed embodiment, utilize the hold-in range to adopt and survey the viscosity change of torque formula method measurement dissolving in-process, viscosity is great when agitating unit stirs promptly and receives the resistance, and the motor shaft through hold-in range connection also can receive corresponding influence, reflects on the torque sensor with the motor shaft is connected, and the moment of torsion can change along with dissolving the process promptly. To obtain the torque variation of the stirring device, the formula is used: the output torque is equal to the torque of the motor × the transmission ratio ÷ transmission efficiency, assuming that the transmission efficiency is 1, i.e.: m is M0X D/D. Wherein M is0The torque of the motor is the output torque of the torque sensor; m is the output torque, i.e. the output torque of the stirring device, D is the diameter of the first pulley and D is the diameter of the second pulley. D/D is the transmission ratio, i.e. the ratio of the diameters of the second pulley and the first pulley.
According to the embodiment of the present disclosure, the diameter of the first pulley is 22mm and the diameter of the second pulley is 55mm in the polymer solution viscosity measuring device.
According to the embodiment of the present disclosure, the polymer solution viscosity measuring apparatus further includes: a dissolving kettle 6, a sealing cover 7 and a pressure adjusting mechanism 81. Wherein, the dissolving kettle 6 is used for containing polymer solution; the sealing cover 7 is hermetically combined on the dissolving kettle 6, and the stirring device 5 extends into the macromolecular solution in the dissolving kettle 6 through the sealing cover 7. And a pressure adjusting mechanism 81 for adjusting the pressure in the dissolution tank 6.
According to an embodiment of the present disclosure, the pressure adjusting mechanism 81 includes: an air inlet pipe 811 connected to the sealing lid 7 for feeding gas under pressure into the dissolution vessel 6; and an exhaust line 812 connected to the sealing cap 7 for exhausting the gas in the dissolution tank 6. The gas inlet line 811 and the gas outlet line 812 cooperate to regulate the pressure inside the dissolution tank 6.
According to the embodiment of the present disclosure, the polymer solution viscosity measuring device further includes a temperature adjusting mechanism 82 for changing the temperature of the polymer solution in the dissolving tank 6.
According to an embodiment of the present disclosure, the temperature adjustment mechanism 82 includes: a water inlet line 821 and a water drain line 822. Wherein the water inlet line 821 is connected to the sealing cover 7 to feed cooling water to the cooling line on the wall of the dissolution tank 6. A drain line 822 connected to the sealing cover 7 to drain the cooling water in the cooling line on the wall of the dissolution tank 6, and the water inlet line 821 and the drain line 822 cooperate to regulate the temperature of the polymer solution in the dissolution tank 6.
According to the embodiment of the present disclosure, the sealing cap 7 is screw-coupled to the dissolution tank 6. According to an embodiment of the present disclosure, the sealing cover 7 is provided with a handle 71 for rotating the sealing cover.
According to an embodiment of the present disclosure, the support portion 1 includes: a column 11 and a first connecting seat 12 arranged on the dissolving kettle. The upright post 11 of the supporting part 1 and the motor 2 are arranged on the first connecting seat 12 to play a role in supporting and fixing.
According to an embodiment of the present disclosure, the first connection socket 12 includes: a body portion 121 and a first connection plate 122. Wherein, the upright post is arranged on one end of the main body part 121, and the other end is detachably connected to the dissolving kettle 6; the first connection plate 122 is integrally connected to the body portion 121, and the motor 2 is mounted on the first connection plate 122.
According to an embodiment of the present disclosure, the support portion 1 further includes a second connection seat 13. The second connecting seat 13 mounts the torque sensor 3 on the pillar 11.
According to an embodiment of the present disclosure, the second connection holder 13 includes: a mounting frame 131 and a plurality of connecting frames 132. The mounting frame 131 is used to fix the torque sensor 3 by chapter; the connecting frame 132 is used to detachably mount the mounting frame 131 on the upright 11.
According to the embodiment of the present disclosure, the polymer solution viscosity measuring device further includes two couplings 9 disposed on two sides of the torque sensor 3. The two couplings 9 are used to connect the motor 2 and the torque sensor 3, and the shaft 411 of the first pulley 41 and the torque sensor 3, respectively.
According to an embodiment of the present disclosure, a coupling 9 connects the torque sensor 3, the shaft 411 and the motor 2 as a whole.
According to an embodiment of the present disclosure, the support 1 further comprises a third connection plate 14. The third connecting plate 14 is fixed to the upper end of the column 11 of the support 1 by a fixing member 141, and the shaft 411 is rotatably inserted into the third connecting plate 14.
According to an embodiment of the present disclosure, a precision bearing assembly is provided within third coupling plate 14, and shaft 411 is mounted within third coupling plate 14 via the bearing assembly. Third web 14 is provided with a bearing cap 142, bearing cap 142 being adapted to lock the bearing assembly in third web 14.
According to the embodiment of the present disclosure, the tension degree of the timing belt 43 can be adjusted by the rotation of the support 1.
According to an embodiment of the present disclosure, the first pulley is fixed to the axle by set screws, and the axle is fixed in precision bearings in third web 14.
According to the embodiment of the disclosure, the measurement process of the polymer solution viscosity measurement device is as follows: preparing polymer solution with corresponding proportion in the dissolving kettle 6, placing the second belt wheel 42 in a cavity of the dissolving kettle 6, and in addition, the dissolving kettle 6 can change the temperature, pressure, nitrogen environment and the like in the kettle; the synchronous belt 43 connects the second belt wheel 42 of the polymer solution with the first belt wheel of the polymer solution viscosity measuring device with a vertical structure, and meanwhile, the first belt wheel 41 is connected with the torque sensor 3 and the motor 2; the motor 2 connected to the torque sensor 3 is started to rotate the polymer solution stirring device 5 by driving the first pulley 41 to rotate. The whole dissolving process is a viscosity change process, and when the stirring device 5 is used for stirring, the resistance is applied, and the first belt pulley 41 connected through the synchronous belt 43 is also affected correspondingly, namely, the dynamic change of the stirring resistance is reflected on the viscosity measuring device. According to the formula, M is M0X D/D, wherein M0Is electricityThe torque of the machine, i.e. the output torque of the torque sensor; m is the output torque, i.e. the output torque of the stirring device, D is the diameter of the first pulley and D is the diameter of the second pulley. And defining the viscosity corresponding to the initial torque as 0, and the viscosity value measured by a viscometer corresponding to the steady-state torque at the same temperature to construct a torque-viscosity conversion formula. Therefore, whether the dissolution is sufficient or not is judged by utilizing the viscosity change curve of the viscosity real-time statistics dissolution process, the real-time analysis of the processing parameters (formula, temperature, pressure and the like) to the actual dissolution is constructed, the dissolution efficiency of the high molecular solution is ensured, and the dissolution efficiency is improved.
FIG. 5 is a schematic of the viscosity change during dissolution of cellulose triacetate according to an embodiment of the disclosure.
FIG. 5 is a graph showing the time-viscosity change of the cellulose triacetate dissolution process shown in FIG. 5, which is obtained by measuring the dissolution process of the cellulose triacetate in a methylene chloride-methanol solution by using the high-molecular solution viscosity measuring device of the present disclosure, wherein the mass fraction of the cellulose triacetate dissolution is as high as 15%, and measuring the viscosity during the dissolution process. Referring to fig. 5, it can be clearly observed that there are two peaks of viscosity before the equilibrium of dissolution is reached. The freely rotating stirring device is subjected to the resistance of the high molecular solid material, the viscosity rises sharply and reaches a first peak value, and when the resistance is overcome, the viscosity begins to drop and reaches a steady state in a short time. With the increase of the dissolution time, the cellulose triacetate gradually swells, the viscosity rises again, and a second peak value is reached. Under the continuous action of the stirring device, solvent molecules permeate into the polymer chains, and the interaction force between the polymer chains is weakened to dissolve. The viscosity drops again. Then gradually becomes a fluid of macroscopic homogeneity and the viscosity tends to be balanced.
FIG. 6 is a schematic of the change in viscosity within 0-1h for cellulose triacetate of embodiments of the disclosure.
FIG. 6 is a graph showing the change in viscosity of the composition of FIG. 5 in 0 to 1 hour. In FIG. 6, the two mutation regions are shown, and it can be seen that the cellulose triacetate solution has a peak value of about 5 to 6 minutes for the first time and about 20 minutes for the second time, while the real macro dissolution equilibrium is gradually dissolved after 3 hours, and the actual measured viscosity by the viscometer is 41700 cps.
According to the polymer solution viscosity measuring device of the embodiment of the disclosure, the change of stirring resistance is reflected to the torque sensor through synchronous belt transmission, so that the dissolving process of the polymer solution is represented, and dynamic monitoring is realized. The device for measuring the viscosity of the polymer solution can ensure the reliability of data acquisition when the experimental parameters change, and accurately judge the influence of the experimental conditions such as formula, temperature and pressure on the dissolution of the polymer solution, thereby improving the dissolution efficiency by changing the technological parameters, providing data support for the actual industrial production and improving the film forming quality.
The technical solution of the present disclosure will be described in detail below with reference to specific examples. It should be noted that the following specific examples are only for illustration and are not intended to limit the disclosure.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the method of the invention should not be construed to reflect the intent: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing inventive embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A polymer solution viscosity measuring device, comprising:
a support part (1);
a motor (2) mounted on the support (1);
a torque sensor (3), wherein a first end of the torque sensor (3) is combined with an output shaft of the motor (2);
a transmission (4), an input of the transmission (4) being coupled to a second end of the torque sensor (3);
the first end of the stirring device (5) is combined with the second end of the transmission device (4), and the second end of the stirring device (5) is inserted into the polymer solution to be detected;
wherein the viscosity change of the polymer solution is determined based on the torque change output by the torque sensor (3) and the transmission ratio of the transmission device (4) so as to characterize the dissolving process of the polymer solution.
2. The polymer solution viscosity measuring device according to claim 1, wherein the transmission device (4) includes:
a first pulley (41) coupled to a second end of the torque sensor (3);
a second pulley (42) coupled to a first end of the stirring device (5); and
a timing belt (43) adapted to connect the first pulley (41) and the second pulley (42), the transmission ratio being the ratio of the diameter of the second pulley to the first pulley.
3. The polymer solution viscosity measuring device according to claim 1, further comprising:
a dissolution kettle (6) in which the polymer solution is contained in the dissolution kettle (6);
the sealing cover (7) is hermetically combined on the dissolving kettle (6), and the stirring device (5) extends into the macromolecular solution in the dissolving kettle (6) through the sealing cover (7); and
a pressure adjusting mechanism (81) adapted to adjust the pressure within the dissolving tank (6);
preferably, the pressure adjusting mechanism (81) includes:
an air inlet pipeline (811) connected to the sealing cover (7) for conveying gas under pressure into the dissolving tank (6); and
an exhaust line (812) connected to the sealing cover (7) to exhaust gas in the dissolution tank (6), the air inlet line (811) and the exhaust line (812) cooperating to regulate pressure inside the dissolution tank (6).
4. The polymer solution viscosity measuring device according to claim 3, further comprising: a temperature adjusting mechanism (82) adapted to change the temperature of the polymer solution in the dissolution tank (6);
preferably, the temperature adjustment mechanism (82) includes:
a water inlet pipeline (821) connected to the sealing cover (7) for conveying cooling water to a cooling pipeline on the kettle wall of the dissolving kettle (6); and
a drain line (822) connected to the sealing cover (7) to drain cooling water in a cooling line on a wall of the dissolution tank (6), the water inlet line (821) and the drain line (822) cooperating to regulate a temperature of the polymer solution in the dissolution tank (6).
5. The polymer solution viscosity measuring device according to claim 3, wherein the sealing cap (7) is screw-coupled to the dissolution tank (6);
preferably, the sealing cover (7) is provided with a handle (71) adapted to rotate the sealing cover.
6. The polymer solution viscosity measuring device according to any one of claims 1 to 5, wherein the support portion (1) includes:
a column (11);
the first connecting seat (12) is arranged on the dissolving kettle, and the upright post supporting part (1) and the motor (2) are arranged on the first connecting seat (12);
preferably, the first connection seat (12) comprises:
a main body part (121), wherein the upright post is installed at one end of the main body part (121), and the other end of the upright post is detachably connected to the dissolving kettle (6); and
a first connection plate (122) integrally connected to the main body portion (121), the motor (2) being mounted on the first connection plate (122).
7. The polymer solution viscosity measuring device according to claim 6, the support portion (1) further comprising: the second connecting seat (13) is used for installing the torque sensor (3) on the upright post (11) through the second connecting seat (13);
preferably, the second connection seat (13) includes:
a mounting frame (131), on which the torque sensor (3) is mounted (131); and
at least one connecting frame (132), by means of which connecting frame (132) the mounting frame (131) is detachably mounted on the upright (11).
8. The device for measuring the viscosity of the polymer solution according to claim 6, further comprising two couplings (9) respectively disposed at two sides of the torque sensor (3) for connecting the motor (2) and the torque sensor (3), and the shaft (411) of the first pulley (41) and the torque sensor (3).
9. The polymer solution viscosity measuring device according to claim 8, wherein the support (1) further comprises a third connecting plate (14) fixed to an upper end of the column (11) of the support (1) by a fixing member (141), and the shaft rod (411) is rotatably inserted into the third connecting plate (14);
preferably, a bearing assembly is arranged in the third connecting plate (14), the shaft rod (411) is mounted to the third connecting plate (14) through the bearing assembly, a bearing cover (142) is arranged on the third connecting plate (14), and the bearing cover (142) is suitable for locking the bearing assembly in the third connecting plate (14).
10. The polymer solution viscosity measuring device according to claim 1, wherein a tension degree of the timing belt (43) is adjustable by rotation of the support portion (1).
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