JP2024053312A - Coating fluid management device, management method, and management program - Google Patents

Abstract

[Problem] To provide a coating fluid management device, management method, and management program capable of determining the gelation state of a coating fluid. [Solution] One embodiment of the coating fluid management device includes a control unit. The control unit acquires analysis data obtained by pulsed NMR analysis of a coating fluid in which functional fine particles are dispersed in a solution. The control unit separates the analysis data into hard components having a relatively short transverse relaxation time and soft components having a relatively long transverse relaxation time. The control unit determines the state of the coating fluid based on at least one of the rate of decrease in the abundance ratio of the hard components, the rate of increase in the abundance ratio of the soft components, and the rate of decrease in the transverse relaxation time of the soft components. The control unit controls a coating fluid production device that produces the coating fluid based on the results of the determination. [Selected Figure] Figure 1

Description

Embodiments of the present invention relate to a coating fluid management device, a management method, and a management program.

Electrodes used in lithium-ion secondary batteries and the like are formed by applying a coating liquid containing an active material, a conductive additive, and a binder to a collector made of a metal foil such as aluminum foil.

JP 2009-301938 A

In recent years, active materials with high energy density have come to be used more and more as the capacity of batteries increases. In this case, the binder in the coating liquid may gel due to the alkaline components remaining in the active material of the coating liquid and the temperature. The gelation of the binder in the coating liquid can lead to coating defects, etc. For this reason, it is desirable to be able to determine the state of gelation of the coating liquid.

The embodiment provides a coating fluid management device, a management method, and a management program that can determine the gelation state of a coating fluid.

The coating liquid management device of one embodiment includes a control unit. The control unit acquires analysis data obtained by performing pulse NMR analysis on a coating liquid in which functional fine particles are dispersed in a solution. The control unit separates the analysis data into hard components having a relatively short transverse relaxation time and soft components having a relatively long transverse relaxation time. The control unit judges the state of the coating liquid based on at least one of the rate of decrease in the abundance ratio of the hard components, the rate of increase in the abundance ratio of the soft components, and the rate of decrease in the transverse relaxation time of the soft components. The control unit controls a coating liquid production device that produces the coating liquid based on the result of the judgment.

FIG. 1 is a diagram showing an example of a configuration of a coating fluid producing system according to an embodiment. FIG. 2 is a diagram illustrating an example of a configuration of a management device. FIG. 3A is a diagram showing an example of a relaxation time curve of a coating liquid as analytical data obtained by a pulsed NMR apparatus. FIG. 3B shows an example of the separation of a relaxation time curve into hard and soft components. FIG. 4A is a graph showing the change in the component ratio over time starting immediately after dispersion. FIG. 4B is a graph showing the change in transverse relaxation time with time starting immediately after dispersion. FIG. 5 is a flow chart showing a coating fluid production process performed by the management device.

The embodiment will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an example of a coating liquid manufacturing system according to an embodiment. The coating liquid manufacturing system 1 has a coating liquid manufacturing device and a management system. The coating liquid manufacturing device is a device that manufactures a coating liquid from a coating liquid material and stores the manufactured coating liquid. The management system monitors the gelation state of the coating liquid in the coating liquid manufacturing device and controls the coating liquid manufacturing device based on the gelation state of the coating liquid. The gelation of the coating liquid is a phenomenon in which the coating liquid solidifies due to the influence of the temperature of the coating liquid and residual components in the coating liquid. When gelation occurs, the viscosity of the coating liquid increases, making it difficult to feed the liquid or causing coating defects. In the embodiment, the gelation state of the coating liquid is monitored and the coating liquid manufacturing device is controlled based on the gelation state of the coating liquid, thereby avoiding feeding defects and coating defects.

As shown in FIG. 1, the coating fluid manufacturing apparatus includes a kneader 2, a disperser 3, a defoamer 4, and storage tanks 5a and 5b. The coating fluid manufactured by the coating fluid manufacturing apparatus can be used in a coater 7.

In the kneader 2, functional fine particles are fed as a coating material for producing a coating liquid. For example, when the coating liquid is used for an electrode of a secondary battery, the functional fine particles include particles such as an active material, a binder, and a conductive auxiliary. As the positive electrode active material, lithium transition metal composite oxide, high nickel (HiNi), etc. can be used. As the negative electrode active material, lithium titanate, etc. can be used. As the conductive auxiliary, acetylene black, carbon black, graphite, etc. can be used. As the binder that binds the active material and the conductive auxiliary, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), fluorine-based rubber, styrene butadiene rubber, etc. can be used. Under the control of the management device 10, the kneader 2 kneads the fed functional fine particles so that they are mixed uniformly. As the kneader 2, for example, a planetary mixer (planetary two-shaft kneader) is used. However, the configuration of the kneader 2 is not limited to a specific configuration.

The coating material kneaded by the kneader 2 and the solution are fed into the disperser 3. For example, when the coating liquid is used for an electrode of a secondary battery, the solution may be a resin solution prepared by dissolving a resin such as polyvinylidene fluoride (PVdF) in a solvent. The disperser 3 disperses the coating material in the solution under the control of the management device 10. For example, a bead mill is used as the disperser 3. However, the configuration of the disperser 3 is not limited to a specific configuration.

The coating liquid produced by the disperser 3 is fed into the defoamer 4. Under the control of the management device 10, the defoamer 4 removes air bubbles mixed in the coating liquid by stirring the coating liquid in a vacuum. The configuration of the defoamer 4 is not limited to a specific configuration.

The storage tanks 5a and 5b are tanks to which the coating liquid degassed by the degassing machine 4 is sent. The storage tanks 5a and 5b are configured to store the sent coating liquid while stirring it. Here, two storage tanks 5a and 5b are shown in FIG. 1. There may be one storage tank, or three or more storage tanks.

The storage tank 5a is provided with two valves 51a and 52a. The valves 51a and 52a are configured to be freely opened and closed under the control of the management device 10. When the valve 51a is opened, the coating liquid is sent from the storage tank 5a to the coater 7. When the valve 52a is opened, the coating liquid is sent from the storage tank 5a to the disperser 3. Similarly to the storage tank 5a, the storage tank 5b is provided with two valves 51b and 52b. The valves 51b and 52b are configured to be freely opened and closed under the control of the management device 10. When the valve 51b is opened, the coating liquid is sent from the storage tank 5b to the coater 7. When the valve 52b is opened, the coating liquid is sent from the storage tank 5b to the disperser 3.

A temperature regulator 6a is attached to the storage tank 5a. A temperature regulator 6b is attached to the storage tank 5b. The temperature regulator 6a cools the storage tank 5a under the control of the management device 10 to adjust the temperature of the coating liquid in the storage tank 5a. The temperature regulator 6b cools the storage tank 5b under the control of the management device 10 to adjust the temperature of the coating liquid in the storage tank 5b. The temperature regulators 6a and 6b may be configured to cool the storage tanks 5a and 5b using any mechanism such as a water-cooling mechanism or an air-cooling mechanism. Furthermore, the temperature regulators 6a and 6b may be equipped with heaters for heating the storage tanks 5a and 5b. In FIG. 1, two temperature regulators 6a and 6b are shown. The number of temperature regulators may be provided in a number corresponding to the number of storage tanks, and may be greater than the number of storage tanks, for example.

The coater 7 coats the coating liquid sent from the storage tank 5a or 5b onto the target object. For example, when the coating liquid is used for an electrode of a secondary battery, the target object is a current collector such as aluminum foil. For example, a die coater is used as the coater 7. However, the configuration of the coater 7 is not limited to a specific configuration.

The management system includes a pulse NMR device 8, a viscometer 9, and a management device 10. The state of the coating fluid stored in the storage tanks 5a, 5b of the coating fluid manufacturing device is monitored by the pulse NMR device 8 and the viscometer 9, and the coating fluid manufacturing device is controlled by the management device 10 based on the results of these monitoring.

The pulsed NMR device 8 measures the transverse (spin-spin) relaxation time of the coating liquid stored in each of the storage tanks 5a and 5b by the pulsed NMR method. For example, the pulsed NMR device 8 applies a radio frequency pulse to the coating liquid to measure the time change in magnetization excited by the coating liquid as an NMR signal, which is an electrical signal. As the pulsed NMR method, a method such as the solid echo method or the CPMG (Carr-Purcell-Meiboom-Gill) method can be used.

The viscometer 9 measures the viscosity of the coating liquid stored in each of the storage tanks 5a and 5b.

The management device 10 is a computer that controls the coating liquid manufacturing apparatus. For example, the management device 10 controls the operation of the kneader 2, the disperser 3, and the degassing device 4. For example, the management device 10 monitors the gelation state of the coating liquid stored in the storage tanks 5a and 5b using a pulse NMR device 8 and a viscometer 9, and controls the liquid transfer from the storage tanks 5a and 5b and the temperature regulators 6a and 6b according to the monitored gelation state of the coating liquid.

Figure 2 is a diagram showing an example of the configuration of the management device 10. The management device 10 has a processor 111, a memory 112, an input device 113, a display device 114, an input/output interface 115, a communication device 116, and a storage 117. The processor 111, the memory 112, the input device 113, the display device 114, the input/output interface 115, the communication device 116, and the storage 117 are connected via a bus 118.

The processor 111 is a control unit that controls the overall operation of the management device 10. The processor 111 is, for example, a CPU (Central Processing Unit). The processor 111 may be an MPU (Micro-Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), etc. The processor 111 may be a single CPU, etc., or multiple CPUs, etc.

The memory 112 is a storage unit that is configured by combining a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM stores the startup program of the management device 10, etc. The RAM is used, for example, as a working memory during processing by the processor 111.

The input device 113 is an input device such as a touch panel, a keyboard, or a mouse. The input device 113 is used, for example, to input various types of data to the management device 10. When the input device 113 is operated, a signal corresponding to the operation is input to the processor 111. The processor 111 performs various processes in response to this signal.

The display device 114 is a display device such as a liquid crystal display or an organic electroluminescence display. The display device 114 is used, for example, to visually display the gelation state of the coating liquid stored in the storage tanks 5a and 5b. The display device 114 may be provided separately from the management device 10.

The input/output interface 115 is an interface for exchanging signals with the pulsed NMR device 8 and the viscometer 9. The input/output interface 115 may be an interface corresponding to the signal lines between the pulsed NMR device 8 and the viscometer 9.

The communication device 116 is a communication device that allows the management device 10 to communicate with an external device. The external device is, for example, a server. In this case, the management device 10 can transmit information on the gelation state of the monitored coating liquid to the server. The communication device 116 may be a communication device for wired communication or a communication device for wireless communication.

Storage 117 is, for example, a storage device such as a hard disk drive or a solid state drive. Storage 117 stores various programs executed by processor 111, such as management program 1171.

The storage 117 also stores a threshold value 1172. The threshold value 1172 is a threshold value for determining the state of gelation of the coating liquid. The threshold value 1172 may include multiple threshold values according to the degree of progress of gelation. The threshold value 1172 will be described in detail later.

The storage 117 also stores a solid content concentration database 1173. The solid content concentration database 1173 is a database that specifies the relationship between the viscosity of the coating liquid and the solid content concentration. The relationship between the viscosity of the coating liquid and the solid content concentration stored in the solid content concentration database 1173 is stored as the result of measuring the relationship between the viscosity of the coating liquid and the solid content concentration in a state where gelation has not progressed.

The operation of the coating fluid production system will be described below. First, the principle of the method for determining the gelation state of the coating fluid in this embodiment will be described.

In recent years, active materials with high energy density, such as HiNi active materials, have been adopted for electrodes in order to increase the capacity of secondary batteries. HiNi active materials are used by dispersing them in a solution with high shear force. In this case, the particles remaining in the HiNi active material are gelled by being taken up by a binder such as PVdF in the coating liquid over time due to factors such as temperature. In an embodiment, the state of gelling of the coating liquid that occurs based on this principle is determined by analyzing the NMR signal measured by a pulse NMR device.

FIG. 3A is a diagram showing an example of a relaxation time curve of a coating liquid as analysis data of the pulse NMR device 8. When a radio frequency pulse is applied to the coating liquid, the spins of the protons in the coating liquid are brought to a ground state with the same orientation. The time required for the spins to reach the ground state with random orientation is the transverse (spin-spin) relaxation time. The magnetization intensity from the ground state with the same orientation of the protons in the coating liquid to the original ground state is expressed as a function of the transverse relaxation time as shown below. The relaxation time curve C shown in FIG. 3A represents such a relationship between magnetization intensity and time. Here, M(t) in formula (1) is magnetization intensity, A is a constant representing the component ratio of the coating liquid, T is the transverse relaxation time, and t is the measurement time. The transverse relaxation time T can be the time required for the magnetization intensity to decay to a predetermined value, for example, 37%.
M(t)=Aexp(−t/T) (1)

Here, as shown in FIG. 3B, the relaxation time curve C can be divided into a hard component Ch having a relatively short transverse relaxation time and a soft component Cs having a relatively long transverse relaxation time. The hard component Ch represents the relaxation state of a component having a relatively high molecular mobility in the coating liquid, such as a binder or a solvent. The soft component Cs represents the relaxation state of a component having a relatively low molecular mobility in the coating liquid, such as particles of an active material. When the relaxation time curve C is divided into the hard component Ch and the soft component Cs, the formula (1) can be expressed as the formula (2). Here, A1 in the formula (2) is a constant representing the component ratio of the hard component, T1 is the transverse relaxation time of the hard component, A2 is a constant representing the component ratio of the soft component, and T2 is the transverse relaxation time of the soft component.
M(t)=A1exp(−t/T1)+A2exp(−t/T2) (2)

Figure 4A is a graph showing the change in the component ratio over time from immediately after dispersion, i.e., immediately after the liquid is sent to the storage tank. As shown in Figure 4A, the component ratio of the hard component decreases over time and reaches a value at the time of gelation. On the other hand, the component ratio of the soft component increases over time and reaches a value at the time of gelation. In other words, it can be said that the rate of decrease in the component ratio of the hard component or the rate of increase in the component ratio of the soft component represents the progress of gelation of the coating liquid. Therefore, the storage 117 can store a threshold value of the component ratio of the hard component and/or a threshold value of the component ratio of the soft component as the threshold value 1172. The processor 111 can determine the state of gelation of the coating liquid by comparing the component ratio A1 of the hard component and/or the component ratio A2 of the soft component calculated from the NMR signal measured by the pulse NMR device 8 with the threshold value.

Figure 4B is a graph showing the change in the transverse relaxation time over time from immediately after dispersion, i.e., immediately after the liquid is sent to the storage tank. As shown in Figure 4B, the transverse relaxation time of the hard component hardly changes over time, whereas the transverse relaxation time of the soft component decreases over time and reaches a value at the time of gelation. In other words, like the component ratio, the transverse relaxation time of the soft component can also represent the degree of progress of gelation of the coating liquid. Therefore, the storage 117 can store a threshold value for the transverse relaxation time of the soft component as the threshold value 1172 instead of or in addition to the threshold value of the component ratio of the hard component and/or the threshold value of the component ratio of the soft component. The processor 111 can determine the state of gelation of the coating liquid by comparing the transverse relaxation time of the soft component calculated from the NMR signal measured by the pulse NMR device 8 with the threshold value.

Here, the storage 117 may store, as the threshold 1172, any one of the threshold for the component ratio of the hard component, the threshold for the component ratio of the soft component, and the threshold for the transverse relaxation time of the soft component. Alternatively, two or more of the threshold for the component ratio of the hard component, the threshold for the component ratio of the soft component, and the threshold for the transverse relaxation time of the soft component may be stored as the threshold 1172. When two or more thresholds are stored, the two or more thresholds may be used respectively to determine the state of gelation with high accuracy, or a threshold selected according to various conditions such as temperature and the components of the coating liquid may be used to determine the state of gelation.

Figure 5 is a flowchart showing the coating liquid production process by the management device 10. The process in Figure 5 is controlled by the processor 111 in accordance with the management program 1171. The process in Figure 5 is performed while the power of the management device 10 is on.

In step S1, the processor 111 determines whether or not to start coating liquid production. For example, when coating liquid material is fed into the kneader 2 and an operator of the management device 10 operates the input device 113 to instruct the start of coating liquid production, it is determined that coating liquid production is to be started. When it is determined in step S1 that coating liquid production is to be started, the process proceeds to step S2. When it is determined in step S1 that coating liquid production is not to be started, the process proceeds to step S6.

In step S2, the processor 111 causes the kneader 2 to knead the coating liquid material. After the kneader 2 kneads the coating liquid material, the kneaded coating liquid material is fed into the disperser 3. Then, the process proceeds to step S3.

In step S3, the processor 111 causes the disperser 3 to disperse the coating material into the solution. After the disperser 3 disperses the coating material, the produced coating liquid is fed into the degassing machine 4. The process then proceeds to step S4.

In step S4, the processor 111 causes the degassing machine 4 to degas the coating liquid. After the degassing machine 4 degasses the coating liquid, the process proceeds to step S5.

In step S5, the processor 111 causes the deaerator 4 to send the coating liquid to the storage tank 5a or 5b. The process then proceeds to step S6. For example, the processor 111 causes the coating liquid to be sent to the storage tank 5a or 5b that has the least amount of coating liquid remaining.

In step S6, the processor 111 acquires NMR signals for each of the storage tanks 5a and 5b from the pulse NMR device 8, and separates the acquired NMR signals into hard and soft components. Furthermore, the processor 111 calculates values to be used in determining the state of gelation among the component ratio A1 of the hard component, the component ratio A2 of the soft component, and the transverse relaxation time T2 of the soft component for each of the storage tanks 5a and 5b.

In step S7, the processor 111 acquires the viscosity of the coating liquid for each of the storage tanks 5a and 5b from the viscometer 9, and corrects the threshold value 1172 based on the acquired viscosity. As described above, the component ratio of the hard component, the component ratio of the soft component, and the lateral relaxation time of the soft component represent the degree of gelation of the coating liquid. On the other hand, the component ratio of the hard component, the component ratio of the soft component, and the lateral relaxation time of the soft component may change not only depending on the degree of gelation of the coating liquid, but also depending on the solid concentration of the coating liquid. In order to eliminate the influence of the solid concentration of the coating liquid, it is desirable to correct the threshold value 1172. The processor 111 estimates the solid concentration based on the relationship stored in the solid concentration database 1173 and the viscosity acquired from the viscometer 9. Then, the processor 111 corrects the threshold value 1172 using the estimated solid concentration. The correction of the threshold value 1172 is performed, for example, by increasing or decreasing the threshold value 1172 according to the estimated solid concentration. The correction of the threshold 1172 may be performed by other methods, for example by referring to a database that defines the relationship between the threshold and the correction value.

In step S8, the processor 111 judges whether or not gelation of the coating liquid is progressing by comparing at least one of the component ratio A1 of the hard component, the component ratio A2 of the soft component, and the transverse relaxation time T2 of the soft component for each of the storage tanks 5a and 5 with the corresponding threshold value. When at least one of the component ratio A1 of the hard component, the component ratio A2 of the soft component, and the transverse relaxation time T2 of the soft component for each of the storage tanks 5a and 5 exceeds a threshold value corresponding to the degree of gelation, it is judged that gelation of the coating liquid is progressing. When it is judged in step S8 that gelation of the coating liquid is progressing, the process proceeds to step S9. When it is judged in step S8 that gelation of the coating liquid is not progressing or that the coating liquid is completely gelled, the process proceeds to step S10.

In step S9, the processor 111 controls the temperature regulator of the storage tank 5a, 5b where gelation is determined to be progressing. In general, gelation of coating liquid is more likely to occur at high temperatures. Therefore, the processor 111 controls the temperature regulator 6a, 6b to cool the storage tank 5a, 5b as the degree of gelation progresses, thereby slowing down the progression of gelation. After that, the process proceeds to S10.

In step S10, the processor 111 judges whether the coating liquid has gelled by comparing at least one of the component ratio A1 of the hard component, the component ratio A2 of the soft component, and the transverse relaxation time T2 of the soft component for each of the storage tanks 5a and 5 with the corresponding threshold value. When at least one of the component ratio A1 of the hard component, the component ratio A2 of the soft component, and the transverse relaxation time T2 of the soft component for each of the storage tanks 5a and 5 exceeds the respective threshold value when gelling has progressed further than when gelling is judged to have progressed in step S8, the coating liquid is judged to have gelled. Note that if the coating liquid completely gelles, it will also cause problems in the liquid transfer, so the above-mentioned threshold value for judging that the coating liquid has gelled is higher than the threshold value for judging that gelling of the coating liquid has progressed in step S8, and is another value at which the coating liquid can be transferred, and it is preferable to predetermine such a threshold value. When it is determined in step S10 that the coating liquid has gelled, the processor 111 sends the coating liquid to the disperser 3 by opening the valve of the storage tank 5a, 5b in which it has been determined that the coating liquid has gelled. The process then returns to step S3. If the coating liquid has gelled, it will not return to its original state as it is, so the disperser 3 disperses the coating liquid again. When it is determined in step S10 that the coating liquid has not gelled, the process proceeds to step S11.

In step S11, the processor 111 determines whether or not coating is to be performed. For example, it is determined that coating is to be performed when an operator of the management device 10 operates the input device 113 to instruct coating. When it is determined in step S11 that coating is to be performed, the process proceeds to step S12. When it is determined in step S11 that coating is not to be performed, the process returns to step S1.

In step S12, the processor 111 opens one of the valves 51a, 51b of the storage tanks 5a, 5b to send the coating liquid to the coater 7. The process then returns to step S1. For example, the processor 111 opens the valve of the storage tank 5a, 5b that has undergone less gelling. After the coating liquid has been sent to the coater 7, the coating liquid is applied to the object by the operator of the coater 7 or automatically.

As described above, according to the embodiment, the gelation state of the stored coating liquid can be determined based on at least one of the component ratio of the hard component, the component ratio of the soft component, and the transverse relaxation time of the soft component obtained by pulse NMR analysis of the coating liquid. Then, the temperature of the storage tank is adjusted or the coating liquid is redispersed depending on the gelation state of the coating liquid. This suppresses gelation of the coating liquid stored in the storage tank, and can avoid problems such as poor liquid transfer to the coater and poor coating by the coater. Therefore, the productivity of secondary batteries and the like can be improved. Furthermore, by sending the coating liquid from a storage tank where the degree of gelation of the coating liquid is low, the possibility of avoiding problems such as poor liquid transfer to the coater and poor coating by the coater is increased. Therefore, the productivity of secondary batteries and the like can be further improved.

In addition, according to the embodiment, the threshold value for determining the degree of gelation progress is corrected according to the viscosity of the coating liquid measured by the viscometer. This eliminates the influence of the solids concentration of the coating liquid, allowing for more accurate determination of the state of gelation.

In the above-described embodiment, the coating liquid manufacturing device is used to manufacture coating liquid for forming electrodes in secondary batteries. In contrast, the technology of the embodiment can also be applied to the management of liquid materials that are prone to change over time, such as semiconductor resists and inkjet inks.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

REFERENCE SIGNS LIST 1 Coating liquid manufacturing system, 2 Kneader, 3 Disperser, 4 Defoamer, 5a, 5b Storage tank, 6a, 6b Temperature regulator, 7 Coater, 8 Pulse NMR device, 9 Viscometer, 10 Management device, 51a, 51b, 52a, 52b Valve, 111 Processor, 112 Memory, 113 Input device, 114 Display device, 115 Input/output interface, 116 Communication device, 117 Storage, 118 Bus, 1171 Management program, 1172 Threshold value, 1173 Solid concentration database.

Claims (9)

obtaining analytical data obtained by performing a pulsed NMR analysis on a coating liquid in which functional fine particles are dispersed;
Separating the analysis data into a hard component with a relatively short transverse relaxation time and a soft component with a relatively long transverse relaxation time;
determining a state of the coating liquid based on at least one of a decrease rate of the abundance ratio of the hard component, an increase rate of the abundance ratio of the soft component, and a decrease rate of the transverse relaxation time of the soft component;
controlling a coating fluid production device that produces the coating fluid based on the result of the determination;
A coating fluid management device having a control unit. The coating liquid management device according to claim 1, wherein the control unit determines the state of the coating liquid further based on the measured viscosity of the coating liquid. the control unit determines the state of the coating liquid by comparing at least one of a decrease rate of the abundance ratio of the hard component, an increase rate of the abundance ratio of the soft component, and a decrease rate of the transverse relaxation time of the soft component with a threshold value;
the control unit corrects the threshold value based on the measured viscosity of the coating liquid.
The coating fluid management device according to claim 2 . the control unit estimates a solid content concentration in the coating liquid from the measured viscosity of the coating liquid based on a predetermined relationship between viscosity and solid content concentration, and corrects the threshold value in accordance with the estimated solid content concentration.
The coating fluid management device according to claim 3 . The coating liquid is stored in a plurality of storage tanks,
The coating fluid management device according to claim 1, wherein the control unit determines the coating fluid to be sent to a next process based on the state of the coating fluid stored in each of the storage tanks, and controls the coating fluid manufacturing device so that the coating fluid is sent from the determined storage tank. The coating fluid management device according to claim 1, wherein the control unit controls the coating fluid manufacturing device to adjust the temperature of the coating fluid based on the state of the coating fluid. The coating fluid management device according to claim 1, wherein the control unit controls the coating fluid manufacturing device to redisperse the coating fluid based on the state of the coating fluid. acquiring analytical data obtained by performing a pulsed NMR analysis on a coating liquid in which functional fine particles are dispersed;
Separating the analytical data into a hard component with a relatively short transverse relaxation time and a soft component with a relatively long transverse relaxation time;
determining a state of the coating liquid based on at least one of a decrease rate of the abundance ratio of the hard component, an increase rate of the abundance ratio of the soft component, and a decrease rate of the transverse relaxation time of the soft component;
controlling a coating fluid production device that produces the coating fluid based on a result of the determination; and
A coating fluid management method comprising the steps of: acquiring analytical data obtained by performing a pulsed NMR analysis on a coating liquid in which functional fine particles are dispersed;
Separating the analytical data into a hard component with a relatively short transverse relaxation time and a soft component with a relatively long transverse relaxation time;
determining a state of the coating liquid based on at least one of a decrease rate of the abundance ratio of the hard component, an increase rate of the abundance ratio of the soft component, and a decrease rate of the transverse relaxation time of the soft component;
controlling a coating fluid production device that produces the coating fluid based on a result of the determination; and
A coating fluid management program for causing a processor to execute the above.