JP2017100117A5 - - Google Patents

Description

Distributed mixing system

The present invention relates to distributed mixing system, for example, to a dispersive mixing systems for the production of various slurries such as slurry containing carbon used in the production of a non-aqueous electrolyte secondary battery.

  Conventionally, lithium-ion secondary batteries have been widely used as non-aqueous electrolyte secondary batteries in various electronic devices such as personal computers and mobile devices. However, as their applications spread to automobiles, aircraft, etc. More specifically, there has been a demand for higher density and larger capacity.

By the way, the characteristic of the slurry used for manufacture of the electrode for nonaqueous electrolyte secondary batteries can be mentioned as one of the important factors which influence battery performance.
This slurry is obtained by dispersing and mixing a solid content such as a positive electrode active material or a negative electrode active material as a solute, a conductive material, and a binder in a solvent such as water. A positive electrode and a negative electrode are obtained by applying to an aluminum foil or copper foil and then drying by heating.

By the way, the slurry is charged with a solid content such as a positive electrode active material or a negative electrode active material, a conductive material, a binder and a solvent such as water in a batch type multi-axis mixer as shown in FIG. It is obtained by carrying out dispersion and mixing (including dissolution of soluble solids). Carbon used as a conductive material, particularly fibrous carbon powder having a large aspect ratio (length / diameter) In the case of a substance having poor dispersibility and solubility, such as CMC (carboxymethyl cellulose) used as a binder, it is difficult to obtain a homogeneous slurry, or the solid content may be maintained in a dispersed and mixed state. There was a problem that it was difficult or it took time to disperse and mix the solid content.
Also, when the batch type multi-shaft mixer is used, bubbles are likely to be mixed in and remain in the slurry, and when the slurry mixed with such bubbles is applied to the electrode substrate and heated and dried, voids are formed in the coating formation layer. There was a problem of being formed.

  By the way, the present applicants previously contain a substance having poor dispersibility and solubility, such as carbon, in view of the problems related to the production of the slurry used in the production of the conventional electrode for a nonaqueous electrolyte secondary battery. Even in this case, a homogeneous slurry can be obtained in a short time, the solid content can be dispersed and maintained for a long time, and the mixture of bubbles and residual in the slurry can be reduced. The dispersion mixing system provided with the dispersion mixing pump used for manufacture of the slurry containing this was proposed (refer patent document 1).

Japanese Patent Laid-Open No. 2015-35344

The invention proposed in Patent Document 1 can achieve the above-described effects, but the applicants can improve the system to achieve more efficient dispersion and high quality. slurry can be made to produce, further, an object of the invention to provide a distributed mixing system which can improve the recovery rate of the slurry.

To achieve the above object, distributed mixing system of the present invention is carried out by rotating the rotor with a rotating blade inside the casing, by causing cavitation in the liquid, the solids content of the dispersion, the mixture A dispersion mixing system including a dispersion mixing pump used for producing a slurry having a process, wherein at least a part of a surface of the dispersion mixing pump in contact with the liquid is coated with a liquid repellent material. It is characterized by.

In this case, it is possible to perform a coating process on the part of the dispersion mixing pump that is rotationally driven , for example, the rotor blade of the dispersion mixing pump, with the liquid repellent material.

Further, the liquid discharged from the dispersion mixing pump, can be made to be provided with a circulation passage for circulating the dispersion mixing pump.

Further, it is possible to make at least a portion of the surface of the liquid member having the circulation passage is in contact, it becomes so as to a coating treatment with the liquid-repellent material.

Further, the liquid repellent material can be made to be a fluororesin.

Further, the liquid repellent material can be made to be a modified fluororesin.

According to distributed mixing system of the present invention, even when containing the dispersibility and solubility is poor material such as carbon, a homogeneous slurry can be obtained in a short time, also solids dispersion was mixed In addition to the operational effects of the invention proposed in the cited document 1 that the state can be maintained for a long time, and further, the mixing and remaining of bubbles in the slurry can be reduced, the following operational effects are exhibited.
(1) In a dispersion mixing system that generates a shearing force in a liquid, coating the inner surface of a device that is in contact with the liquid with a liquid repellent material reduces the shearing force applied to the liquid, resulting in efficient dispersion mixing. In the dispersive mixing system equipped with this dispersive mixing pump, the liquid flow resistance is reduced and cavitation is promoted by coating with a liquid repellent material. And more efficient dispersive mixing is possible.
(2) Since the flow resistance of the liquid is reduced and dispersion mixing can be performed at a low rotational speed, the power consumption can be reduced, the heat generation of the liquid can be suppressed, and a high-quality slurry without thermal history can be produced. can do.
(3) The slurry recovery rate can be improved by the liquid repellency.

  In addition, by interposing a circulation pump in the circulation channel, a substance having poor dispersibility and solubility, such as carbon, assisting the suction from the second supply unit of the liquid dispersion mixing pump to the second introduction chamber The dispersion mixing performance of can be improved.

  In addition, the use of a fluororesin as a liquid repellent material, among them, a modified fluororesin, can increase surface hardness, reduce wear and prevent contamination. Since a certain polyimide resin is a constituent material of the negative electrode of the next generation battery, it is possible to prevent the problem of contamination.

Is an explanatory view showing an embodiment of a distributed mixing system of the present invention. It is a longitudinal cross-sectional view which shows the principal part of a fixed amount supply apparatus. It is sectional drawing in the III-III direction view of FIG. It is explanatory drawing which shows the internal structure of the dispersion | distribution mixing mechanism of a dispersion | distribution mixing pump. It is sectional drawing in the VV direction view of FIG. It is a disassembled perspective view which shows the internal structure of the dispersion | distribution mixing mechanism of a dispersion | distribution mixing pump. It is a schematic block diagram of a partition plate. It is explanatory drawing which shows the internal structure of the isolation | separation part of a recirculation mechanism part. It is a photograph which shows the experimental result which compared the discharge | emission condition from the stirring tank of what made the coating process of the modification | denaturation fluororesin to SUS304, and the thing with SUS304 as it is. It is a photograph which shows the experimental result which compared the water repellency and oil repellency of the various slurry by the surface treatment of SUS. It is a top view which shows an example of the batch type multi-axis mixer used for manufacture of the conventional slurry.

Hereinafter, the embodiments of the distributed mixing system of the present invention will be described with reference to the drawings.

In FIGS. 1 to 8 show an embodiment of a distributed mixing system of the present invention.

FIG. 1 shows a dispersion mixing system 100 including a centrifugal dispersion mixing pump Y.
This dispersion mixing system 100 uses powder P (solid content) as a dispersoid, uses solvent R as a liquid phase dispersion medium, and disperses and mixes powder P in solvent R (dissolves soluble solid content). The same shall apply hereinafter) to produce slurry F.
In the present embodiment, for example, as the powder P, a material that occludes and releases alkali metal ions, carbon, and CMC (carboxyl methylcellulose), which are slurry materials used in the manufacture of electrodes for nonaqueous electrolyte secondary batteries, are used. Water was used as the solvent R.

  As shown in FIG. 1, the dispersion and mixing system 100 includes a quantitative supply device X that supplies powder P in a fixed amount, a solvent supply unit 50 that supplies solvent R in a fixed amount, and a powder P that is supplied in a fixed amount from the quantitative supply device X. And a solvent R that is quantitatively supplied from the solvent supply unit 50 are dispersed and mixed by suction under negative pressure, and a powder that is not completely dispersed and mixed from the slurry F discharged from the dispersion and mixing pump Y A recirculation mechanism 70 that circulates and supplies a solvent R containing P (hereinafter referred to as “undispersed slurry Fr”) to the dispersion mixing pump Y is provided.

[Quantitative supply device]
As shown in FIG. 1, the quantitative supply device X includes a hopper 31 that discharges the powder P received from the upper opening 31a from the lower opening 31b, a stirring mechanism 32 that stirs the powder P in the hopper 31, With the upper opening 31a of the hopper 31 open to the atmosphere, the lower opening 31b is absorbed by the negative pressure suction force acting on the lower opening 31b by the suction of the dispersion mixing pump Y connected to the downstream side of the lower opening 31b. And a positive displacement quantitative supply unit 40 for quantitatively supplying the powder P discharged from the liquid to the dispersion mixing pump Y.

  The hopper 31 is formed in an inverted conical shape that is reduced in diameter as it goes from the upper part to the lower part, and its central axis A1 is arranged in a posture along the vertical direction. The cross-sectional shape of each of the upper opening 31a and the lower opening 31b of the hopper 31 is a circular shape centered on the central axis A1 when viewed in the vertical direction of FIG. The inclination angle of the wall surface is approximately 60 degrees with respect to the horizontal plane.

  The stirring mechanism 32 is disposed in the hopper 31 and has a stirring blade 32A that stirs the powder P in the hopper 31, a blade driving motor M1 that rotates the stirring blade 32A around the central axis A1 of the hopper 31, An attachment member 32B that supports the blade drive motor M1 positioned above the upper opening 31a of the hopper 31 and a transmission member 32C that transmits the rotational driving force of the blade drive motor M1 to the stirring blade 32A are configured. .

  The stirring blade 32A is configured by bending a rod-like member into a substantially V-shape, with one side portion being along the inner wall surface of the hopper 31 and the other side portion being at the center axis A1 of the hopper 31. It is coaxially and rotatably supported. Further, the stirring blade 32A has a triangular cross-sectional shape, and is arranged so that a surface forming one side of the triangle is substantially parallel to the inner wall surface of the hopper 31. Thus, the stirring blade 32A is disposed so as to be rotatable around the central axis A1 along the inner wall surface of the hopper 31.

As shown in FIGS. 1 to 3, the positive displacement type quantitative supply unit 40 is a mechanism that quantitatively supplies the powder P supplied from the lower opening 31 b of the hopper 31 to the downstream mixing pump Y by a predetermined amount. is there.
Specifically, the introduction part 41 connected to the lower opening part 31 b of the hopper 31, the casing 43 provided with the supply port 43 a and the discharge port 43 b, and the measuring rotator 44 rotatably disposed in the casing 43. And a metering rotator drive motor M2 that rotationally drives the metering rotator 44.

  The introduction part 41 is formed in a cylindrical shape that communicates the lower opening 31b of the hopper 31 and the supply port 43a formed in the upper part of the casing 43, and has a slit having the same shape as the supply port 43a of the casing 43 at the lowermost end. A shaped opening is formed. The introduction portion 41 is formed in a tapered shape that becomes thinner toward the supply port 43 a side of the casing 43. The shape of the slit-shaped opening can be appropriately set according to the size of the hopper 31, the supply amount of the powder P, the characteristics of the powder P, and the like. The dimension is set to about 20 to 100 mm, and the dimension in the width direction is set to about 1 to 5 mm.

The casing 43 is formed in a substantially rectangular parallelepiped shape, and is connected to the hopper 31 via the introduction portion 41 in a posture inclined by 45 degrees with respect to the horizontal direction (left-right direction in FIG. 1).
As shown in FIGS. 2 and 3, the upper surface of the casing 43 is provided with a slit-shaped supply port 43 a corresponding to the slit-shaped opening of the introduction portion 41, and the powder P from the lower opening 31 b of the hopper 31 is provided. Can be supplied into the casing 43. At the lower part of the lower side surface (right side surface in FIG. 2) of the casing 43 arranged in an inclined manner, the powder P, which is quantitatively supplied by the metering rotator 44, is dispersed and mixed on the downstream side via the expansion chamber 47. A discharge port 43b for discharging to the pump Y is provided, and a powder discharge pipe 45 is connected to the discharge port 43b. The expansion chamber 47 is provided at a position in the casing 43 to which the powder P supplied from the supply port 43a to the powder storage chamber 44b of the measuring rotator 44 is supplied in a fixed amount, and is operated by the negative pressure acting from the discharge port 43b. The pressure is maintained at a lower pressure than the supply port 43a. That is, the discharge port 43b is connected to the primary side of the dispersion mixing pump Y so that the negative pressure suction force acts on the expansion chamber 47 and is maintained at a lower pressure than the discharge port 43b. As the measuring rotator 44 rotates, the state of each powder storage chamber 44b is changed to a negative pressure state and a higher pressure state than the negative pressure state.

  The measuring rotator 44 has a disk member 49 disposed on the drive shaft 48 of the measuring rotator driving motor M <b> 2, and a plurality of (e.g., eight) plate-shaped partition walls 44 a radially excluding the central portion of the disk member 49. It is configured to be attached at intervals, and is configured to form a plurality of powder storage chambers 44b (for example, 8 chambers) at equal intervals in the circumferential direction. The powder storage chamber 44 b is configured to open at the outer peripheral surface and the center portion of the measuring rotary body 44. An opening closing member 42 is unevenly distributed in the central direction of the measuring rotating body 44 and is fixedly arranged. The opening on the center side of each powder storage chamber 44b is closed or opened according to the rotation phase. It is configured to be possible. The supply amount of the powder P can be adjusted by changing the number of rotations of the measuring rotator 44 by the measuring rotator driving motor M2 that rotationally drives the measuring rotator 44.

  With the rotation of the measuring rotator 44, each powder storage chamber 44b is opened to the expansion chamber 47, opened to the expansion chamber 47, the first sealed state not communicating with the expansion chamber 47 and the supply port 43a, and opened to the supply port 43a. The supply port is opened and the supply port 43a and the expansion chamber 47 are communicated with each other in the order of the second sealed state. The casing 43 is formed such that the opening on the outer peripheral surface side of the measuring rotator 44 is closed in the first sealed state and the second sealed state, and the opening on the center side of the measuring rotator 44 is the first sealed. The opening closing member 42 is fixedly disposed on the casing 43 so as to be closed in the state, the supply port open state, and the second sealed state.

  Therefore, in the quantitative supply device X, the powder P stored in the hopper 31 is supplied to the quantitative supply unit 40 while being stirred by the stirring blade 32A, and the powder P is discharged from the discharge port 43b by the quantitative supply unit 40. A fixed amount is supplied to the dispersion mixing pump Y through the body discharge pipe 45.

  More specifically, the pressure in the expansion chamber 47 in the casing 43 is in a negative pressure state by the negative pressure suction force from the dispersion mixing pump Y connected to the downstream side of the discharge port 43b of the constant supply unit 40. On the other hand, since the upper opening 31a of the hopper 31 is open to the atmosphere, the inside of the hopper 31 is in a state of about atmospheric pressure. The inside of the introduction part 41 and the vicinity of the lower opening 31b communicating with each other through the gap between the expansion chamber 47 and the metering rotator 44 are in a pressure state between the negative pressure state and the atmospheric pressure state.

  In this state, the powder P in the vicinity of the inner wall surface of the hopper 31 and the lower opening 31b is agitated by the stirring blade 32A of the stirring mechanism 32, whereby the powder P in the hopper 31 is sheared by the stirring blade 32A. On the other hand, the metering rotator 44 is rotated by the metering rotator drive motor M2, so that the empty powder storage chambers 44b are in continuous communication with the supply port 43a. Then, the powder P in the hopper 31 flows down through the introduction portion 41 from the lower opening 31b and is stored in a predetermined amount in the powder storage chamber 44b of the measuring rotary body 44 that is in communication with the supply port 43a one after another. The powder P stored in the powder storage chamber 44b flows down to the expansion chamber 47 and is discharged from the discharge port 43b. Therefore, the fixed amount supply device X can continuously supply the powder P to the first supply unit 11 of the dispersion mixing pump Y continuously by a predetermined amount through the powder discharge pipe 45.

  As shown in FIG. 1, the powder discharge pipe 45 is provided with a shutter valve 46 capable of stopping the supply of the powder P to the first supply unit 11 of the dispersion mixing pump Y.

(Solvent supply unit)
As shown in FIG. 1, the solvent supply unit 50 is configured to continuously supply the solvent R stored in the storage and mixing tank 51 to the first supply unit 11 of the dispersion mixing pump Y at a set flow rate. Yes.
Specifically, the solvent supply unit 50 stores a solvent mixing tank 51 that stores and sends the solvent R supplied via the solvent supply pipe 51R, and a delivery pump 52P that sends the solvent R from the storage mixing tank 51. The intervening supply pipe 52, a flow rate adjusting valve (not shown) for adjusting the flow rate of the solvent R sent from the storage and mixing tank 51 to the supply pipe 52 to a set flow rate, and the solvent R adjusted to the set flow rate are quantified. A mixing mechanism 60 is provided that is mixed with the powder P that is quantitatively supplied from the supply unit 40 and is supplied to the first supply unit 11.
Here, as will be described later, the storage and mixing tank 51 is configured such that the slurry F in a state where the powder P is dispersed and mixed from the discharge path 22 is introduced together with the bubbles contained in the slurry F.
For this reason, the storage and mixing tank 51 is provided with an agitation mechanism 51K and is connected to an air (gas) G discharge pipe 51G and a manufactured slurry F discharge path 53.

As shown in FIG. 4, the mixing mechanism 60 includes a mixing member 61 that connects the powder discharge pipe 45 and the supply pipe 52 to the first supply unit 11.
The mixing member 61 is configured to have a smaller diameter than the cylindrical first supply unit 11, and is inserted into the first supply unit 11 so as to form an annular slit 63 between the first supply unit 11. An annular flow path forming portion 65 is provided which forms an annular flow path 64 in the outer peripheral portion of the first supply portion 11 in a state where it communicates with the cylindrical portion 62 and the annular slit 63 disposed over the entire circumference. It is configured.
The powder discharge pipe 45 is connected to the mixing member 61 in a state of communicating with the cylindrical portion 62, and the supply pipe 52 is connected to supply the solvent R to the annular flow path 64 in the tangential direction. .
The powder discharge pipe 45, the cylindrical portion 62 of the mixing member 61, and the first supply portion 11 have an angle 45 with respect to an inclined posture (horizontal plane (left-right direction in FIG. 1)) with the axis A <b> 2 facing downward. It is arranged so as to be inclined.

That is, the powder P discharged from the discharge port 43b of the fixed amount supply unit 40 to the powder discharge tube 45 is introduced into the first supply unit 11 along the axis A2 through the cylindrical portion 62 of the mixing member 61. . On the other hand, since the solvent R is supplied to the annular flow path 64 from the tangential direction, the solvent R is in a state of a hollow cylindrical vortex without a break through the annular slit 63 formed on the inner peripheral side of the annular flow path 64. It is supplied to the first supply unit 11.
Therefore, the powder P and the solvent R are uniformly premixed by the cylindrical first supply unit 11, and the premixed mixture Fp is sucked and introduced into the first introduction chamber 13 of the dispersion mixing pump Y.

[Dispersed mixing pump]
The dispersion mixing pump Y will be described with reference to FIGS. 1 and 4 to 8.
As shown in FIG. 4, the dispersive mixing pump Y includes a casing 1 having a cylindrical outer peripheral wall portion 4 whose both end openings are closed by a front wall portion 2 and a rear wall portion 3. The rotor 5 is concentrically provided in a freely rotatable manner, the cylindrical stator 7 is provided concentrically within the casing 1 and fixedly disposed on the front wall 2, and the pump drive motor that rotationally drives the rotor 5. M3 etc. are provided.

As shown in FIG. 5, on the radially outer side of the rotor 5, a plurality of rotor blades 6 project to the front side (the left side in FIG. 4) which is the front wall 2 side, and in the circumferential direction, etc. It is provided integrally with the rotor 5 in a state of being arranged at intervals.
The cylindrical stator 7 is provided with a plurality of through-holes 7a and 7b, which are throttle channels, arranged side by side in the circumferential direction. The stator 7 rotates on the front side of the rotor 5 (left side in FIG. 4) and rotates. A rotating blade 6 that also serves as a discharge chamber and circulates between the stator 7 and the outer peripheral wall portion 4 of the casing 1 is positioned on the inner side in the radial direction of the blade 6 and fixed to the front wall portion 2. An annular blade chamber 8 is formed.

As shown in FIGS. 4 to 6, a first supply unit that sucks and introduces a premixed mixture Fp, in which the powder P and the solvent R are premixed by the mixing mechanism 60, into the casing 1 by the rotation of the rotor blades 6. 11 is provided at a position shifted from the center axis of the front wall portion 2 (axial center A3 of the casing 1) to the outer peripheral side.
As shown in FIGS. 4 and 6, an annular groove 10 is formed on the inner surface of the front wall portion 2 of the casing 1, and a first supply portion 11 is provided in communication with the annular groove 10.
As shown in FIGS. 4 and 5, the cylindrical discharge portion 12 that discharges the slurry F generated by mixing the powder P and the solvent R is the circumferential direction of the cylindrical outer peripheral wall portion 4 of the casing 1. 1 is provided in a state extending in the tangential direction of the outer peripheral wall 4 and communicating with the blade chamber 8.

As shown in FIGS. 1, 4, and 8, in this embodiment, the slurry F discharged from the discharge unit 12 is supplied to the recirculation mechanism unit 70 through the discharge path 18, and the recirculation mechanism unit 70 is separated. The undispersed slurry Fr from which bubbles have been separated in a cylindrical container 71 as a part is circulated and supplied into the casing 1 through a circulation channel 16 with a circulation pump 16P rotated by a pump drive motor M4. The 2nd supply part 17 to perform is provided in the center part (concentric with axial center A3) of the front wall part 2 of the casing 1. As shown in FIG.
Moreover, as shown in FIGS. 4-6, the partition plate 15 which divides the inner peripheral side of the stator 7 into the 1st introduction chamber 13 by the side of the front wall part 2, and the 2nd introduction chamber 14 by the side of the rotor 5 is provided. In addition to being provided in a state of rotating integrally with the rotor 5 on the front side of the rotor 5, a scraping blade 9 is provided on the front wall 2 side of the partition plate 15. A plurality of scraping blades 9 are concentrically provided at equal intervals in the circumferential direction (four in FIG. 6), and each of the scraping blades 9 enters the annular groove 10 in the state where each of the scraping blades 9 enters the annular groove 10. And are arranged so as to be able to circulate integrally.

The first introduction chamber 13 and the second introduction chamber 14 are configured to communicate with the blade chamber 8 through the plurality of through holes 7 a and 7 b of the stator 7, and the first supply unit 11 is the first supply portion 11. The second supply unit 17 communicates with the introduction chamber 13 and communicates with the second introduction chamber 14.
Specifically, the first introduction chamber 13 and the blade chamber 8 are a plurality of first introduction chambers 13 arranged at equal intervals in the circumferential direction at a portion facing the first introduction chamber 13 in the stator 7. The second introduction chamber 14 and the blade chamber 8 communicate with each other through the through-holes 7a, and the second introduction chamber 14 and the blade chamber 8 are arranged at equal intervals in the circumferential direction at a portion facing the second introduction chamber 14 in the stator 7. It communicates with a through hole 7b on the introduction chamber 14 side.

Each part of the dispersion mixing pump Y will be described.
As shown in FIG. 4, the rotor 5 is configured to have a shape in which the front surface swells substantially in a truncated cone shape, and is arranged at equal intervals on the outer peripheral side with a plurality of rotor blades 6 protruding forward. Is provided. In FIG. 5, ten rotating blades 6 are arranged at equal intervals in the circumferential direction. Further, the rotor blade 6 is formed to project from the outer periphery side of the rotor 5 to the inner periphery side so as to incline backward in the rotation direction from the inner periphery side toward the outer periphery side. The inner diameter is slightly larger than the outer diameter of the stator 7.
The rotor 5 is connected to a drive shaft 19 of a pump drive motor M3 inserted through the rear wall 3 and inserted into the casing 1 in a state of being concentrically positioned with the casing 1 in the casing 1, and the pump It is rotationally driven by the drive motor M3.
Then, the rotor 5 is rotationally driven in a direction in which the tip end portion of the rotor blade 6 is the front side when viewed in the axial direction (viewed in the direction VV in FIG. 4 as shown in FIG. 5). A so-called local boiling (cavitation) occurs on the surface (back surface) 6a which is the rear side in the rotation direction.

As shown in FIGS. 4, 6, and 7, the partition plate 15 is configured in a generally funnel shape having an outer diameter slightly smaller than the inner diameter of the stator 7. Specifically, the funnel-shaped partition plate 15 includes a funnel-shaped portion 15b opened at a central sliding portion of a cylindrical sliding contact portion 15a projecting in a cylindrical shape, and the funnel-shaped portion 15b. In the outer peripheral part of this, it is comprised in the shape provided with the cyclic | annular flat plate part 15c used as the state orthogonal to the axial center A3 of the casing 1 in the front surface and the rear surface.
As shown in FIGS. 4 and 5, the partition plate 15 has a plurality of locations spaced at equal intervals in the circumferential direction with the top cylindrical sliding contact portion 15 a facing the front wall portion 2 side of the casing 1. It is attached to the attachment portion 5a on the front surface of the rotor 5 via the spacing members 20 arranged in (four places in this embodiment).

  As shown in FIG. 5 and FIG. 7 (c), when the partition plate 15 is attached to the rotor 5 via the spacing member 20 at each of a plurality of locations, the stirring blade 21 is placed on the rear wall 3 side of the casing 1. The four agitating blades 21 are configured to rotate integrally with the rotor 5 when the rotor 5 is driven to rotate by being integrally assembled to the partition plate 15 in a posture to face.

  As shown in FIGS. 4 and 6, in this embodiment, the cylindrical second supply portion 17 is concentric with the casing 1 and is provided at the center of the front wall portion 2 of the casing 1. The second supply part 17 is formed with a throttle part 14a having a smaller diameter than the inner diameter of the circulation flow path 16 and smaller than the cylindrical sliding contact part 15a of the partition plate 15 and a smaller flow area. As the rotor blade 6 of the rotor 5 rotates, the slurry F is discharged through the discharge unit 12, and the undispersed slurry Fr is introduced through the throttle unit 14a of the second supply unit 17. The inside of the dispersion mixing pump Y is depressurized.

  As shown in FIG. 4 to FIG. 6, the first supply unit 11 is a casing in which the opening (inlet portion) that opens into the casing 1 includes a part of the annular groove 10 in the circumferential direction inside. 1 is provided on the front wall portion 2 so as to be located laterally of the opening of the second supply portion 17 with respect to the interior of the first supply portion 17. The first supply unit 11 has a horizontal axis that is parallel to the axis A3 of the casing 1 and orthogonal to the axis A3 of the casing 1 in plan view (up and down direction in FIGS. 1 and 4). The front wall portion of the casing 1 in a downward inclined posture that approaches the axis A3 of the casing 1 as the shaft center A2 approaches the front wall portion 2 of the casing 1 when viewed from the direction (viewed from the front and back of the paper in FIGS. 1 and 4). 2 is provided. Incidentally, the downward inclination angle of the first supply unit 11 with respect to the horizontal direction (left-right direction in FIGS. 1 and 4) is about 45 degrees as described above.

  As shown in FIGS. 4 and 6, the stator 7 is attached to the inner surface of the front wall portion 2 of the casing 1 (surface facing the rotor 5), and the front wall portion 2 of the casing 1 and the stator 7 are integrated. It is fixed to become. In the stator 7, the plurality of through holes 7 a on the first introduction chamber 13 side disposed in the portion facing the first introduction chamber 13 are formed in a substantially circular shape, and the flow passage area of the first introduction chamber 13 is formed. The total flow passage area of the plurality of through holes 7a on the first introduction chamber 13 side is set to be smaller than that of the first introduction chamber 13 and the second plurality of second passages disposed in the portion facing the second introduction chamber 14. The through-holes 7b on the introduction chamber 14 side are formed in an approximately elliptic shape, and the total flow area of the plurality of through-holes 7b on the second introduction chamber 14 side is smaller than the flow area of the second introduction chamber 14. It is set to be. As the rotor blade 6 of the rotor 5 rotates, the slurry F is discharged through the discharge portion 12, and the preliminary mixture Fp is supplied through the through hole 7a on the first introduction chamber 13 side, and the second Since the undispersed slurry Fr is introduced through the supply unit 17, the inside of the dispersion mixing pump Y is depressurized.

  As shown in FIGS. 6 and 7, in this embodiment, each scraping blade 9 is formed in a rod shape, and the rod-like scraping blade 9 is viewed in the radial direction of the rotor 5 (viewed from the front and back in FIG. 7B). The tip side of the ejector blade 9 is located closer to the front wall 2 side, and the tip side of the rod-shaped scraping blade 9 is closer to the front side of the rotor 5 as viewed in the axial direction of the rotor 5 (viewed from the front and back in FIG. 7A). The base end portion 9B of the rod-shaped scraping blade 9 is fixed so as to rotate integrally with the rotor 5 in an inclined posture located on the radially inner side of the rotor 5, and the rotor 5 is viewed in the axial direction (see FIG. 7 (a), the tip of the scraping blade 9 is rotationally driven in a direction (the direction indicated by an arrow in FIGS. 4 to 7).

The scraping blade 9 will be described with reference to FIGS.
The scraping blade 9 has a base end portion 9B fixed to the partition plate 15, an intermediate portion 9M that is exposed to the first introduction chamber 13, and a tip end that is fitted (that is, enters) the annular groove 10. The portion 9T is configured in a rod shape provided in a series from the proximal end to the distal end.

As shown in FIGS. 5, 6, and 7 (b), the base end portion 9 </ b> B of the scraping blade 9 is generally formed in a rectangular plate shape.
As shown in FIGS. 5, 6, 7 (a) and 7 (b), the intermediate portion 9 </ b> M of the scraping blade 9 is configured in a substantially triangular prism shape with a substantially triangular cross-sectional shape (particularly, (See FIG. 5). Further, by providing the scraping blade 9 in the inclined posture as described above, one side surface 9m (hereinafter referred to as “a dissipating surface”) facing the front side in the rotational direction of the rotor 5 among the three side surfaces of the triangular columnar intermediate portion 9M. ) Is a front-falling shape that is inclined toward the front side in the rotational direction of the rotor 5, and is directed radially outward with respect to the radial direction of the rotor 5 (hereinafter referred to as “obliquely outward”). (In particular, see FIGS. 6 and 7).

  That is, the bar-shaped scraping blade 9 is provided in the inclined posture as described above, so that the intermediate portion 9M exposed to the first introduction chamber 13 of the scraping blade 9 is inserted into the annular groove 10 from the tip portion 9T. Is also located on the radially outer side of the rotor 5, and the radiating surface 9 m facing the front side in the rotational direction of the intermediate portion 9 </ b> M is in a forwardly descending shape inclined toward the front side in the rotational direction of the rotor 5. It is inclined obliquely outward with respect to the radial direction. As a result, the preliminary mixture Fp scraped from the annular groove 10 by the tip portion 9T of the scraping blade 9 is disposed in the first introduction chamber 13 by the diffusion surface 9m of the intermediate portion 9M of the scraping blade 9. Guided to flow radially outward.

As shown in FIGS. 6, 7 (a) and 7 (b), the tip end portion 9 </ b> T of the scraping blade 9 has a substantially quadrangular prism shape with a substantially rectangular cross-sectional shape, and the axial view of the rotor 5 ( 7A, the outward side surface 9o facing the radially outward side of the rotor 5 among the four side surfaces is an inwardly facing inner surface facing the radially inward side of the inner surface of the annular groove 10. The inward side surface 9i is configured in an arc shape along the outward inner surface facing the radially outer side of the inner surface of the annular groove 10 on the radially inner side of the rotor 5 among the four side surfaces. .
Of the four side surfaces of the quadrangular columnar tip portion 9T, the scraped surface 9f facing the front side in the rotational direction of the rotor 5 is in a front-falling shape inclined toward the front side in the rotational direction of the rotor 5, and the diameter of the rotor 5 It is configured to face radially outward with respect to the direction (hereinafter, sometimes referred to as “obliquely outward”).
Thereby, the preliminary mixture Fp scraped from the annular groove 10 by the tip portion 9T of the scraping blade 9 is directed radially outward of the rotor 5 by the scraping surface 9f of the tip portion 9T of the scraping blade 9. It is discharged into the first introduction chamber 13.
Further, the tip surface 9t of the tip portion 9T of the scraping blade 9 is configured to be parallel to the bottom surface of the annular groove 10 in a state where the tip portion 9T is fitted in the annular groove 10.

  Further, when the rotor 5 is rotationally driven in a direction in which the tip of the scraping blade 9 is the front side when viewed from the axial direction (viewed from the front and back of the paper in FIG. 7A), the base end portion of the scraping blade 9 A surface (back surface) 9a which is the rear side in the rotation direction is formed on each of 9B, the intermediate portion 9M, and the tip portion 9T. The rear surface 9a is configured such that so-called local boiling (cavitation) occurs when the scraping blade 9 rotates.

  The four scraped wings 9 configured in the above-described shape are arranged in the circumferential direction at intervals of 90 degrees at the central angle in the inclined posture as described above, and the base end portions 9B are respectively arranged. It is fixed to the annular flat plate portion 15 c of the partition plate 15.

As shown in FIG. 4, the partition plate 15 provided with the scraping blades 9 is attached to the attachment portion 5 a on the front surface of the rotor 5 in a state of being separated from the front surface of the rotor 5 by the interval holding member 20. 5 is disposed in the casing 1 in a state in which the cylindrical sliding contact portion 15a of the partition plate 15 is fitted in the second supply portion 17 so as to be capable of sliding contact rotation.
As a result, a tapered second introduction chamber 14 having a smaller diameter toward the front wall 2 side of the casing 1 is formed between the bulging front surface of the rotor 5 and the rear surface of the partition plate 15. The supply unit 17 is configured to communicate with the second introduction chamber 14 via the cylindrical sliding contact portion 15 a of the partition plate 15.
An annular first introduction chamber 13 communicating with the first supply unit 11 is formed between the front wall 2 of the casing 1 and the front surface of the partition plate 15.

  Then, when the rotor 5 is driven to rotate, the partition plate 15 rotates integrally with the rotor 5 in a state where the cylindrical sliding contact portion 15 a is in sliding contact with the second supply portion 17. Even in a state where the plate 15 rotates, the state where the second supply unit 17 communicates with the second introduction chamber 14 via the cylindrical sliding contact portion 15a of the partition plate 15 is maintained.

[Recirculation mechanism]
The recirculation mechanism part (an example of a separation part) 70 is configured to separate the dissolved liquid by specific gravity in the cylindrical container 71, and as shown in FIG. 1, from the discharge part 12 of the dispersion mixing pump Y to the discharge path 18. A state in which the powder P is almost completely dispersed and mixed in the circulation channel 16 from the slurry F supplied through the uncirculated slurry Fr that may contain the powder P that is not completely dispersed and mixed. The slurry F is separated into the discharge path 22 together with the bubbles contained in the slurry F. The discharge path 18 and the circulation path 16 are each connected to the lower part of the cylindrical container 71, and the discharge path 22 is connected to the storage and mixing tank 51 from a discharge part 73 formed at the upper part of the cylindrical container 71.
Here, as shown in FIG. 8, the recirculation mechanism unit 70 is provided with an introduction pipe 72 to which the discharge passage 18 is connected so as to protrude from the bottom surface of the cylindrical container 71 to the upper part of the cylindrical container 71. A discharge part 73 connected to the discharge path 22 is provided, and a circulation part 74 connected to the circulation flow path 16 is provided at the lower part. The flow of the slurry F discharged from the introduction pipe 72 is flown to the upper discharge end of the introduction pipe 72. A twist plate 75 to be swiveled is arranged. Thereby, the bubbles of the solvent R are separated from the slurry F, and the bubbles of the solvent R are separated from the undispersed slurry Fr circulated and supplied to the circulation flow path 16 and supplied to the second introduction chamber 14. Can do.

(Control part)
Although not shown, the control unit provided in the dispersion mixing system 100 includes a known arithmetic processing device including a CPU, a storage unit, and the like. The fixed amount supply device X, the dispersion mixing pump Y, and the solvent supply that constitute the dispersion mixing system 100 The operation of each device such as the unit 50 is configured to be controllable.
In particular, the control unit is configured to be able to control the peripheral speed of the rotor blade 6 (the number of rotations of the rotor 5), and the pressure in the first introduction chamber 13 and the second introduction chamber 14 is in a predetermined negative pressure state. As described above, by setting the peripheral speed of the rotor blade 6 (rotation speed of the rotor 5) and rotating the rotor blade 6 at the set peripheral speed (rotation speed of the rotor 5), at least the first speed of the stator 7 is reached. The region in the blade chamber 8 immediately after passing through the through-hole 7a on the introduction chamber 13 side and the through-hole 7b on the second introduction chamber 14 side is continuously spread over the entire circumference in the blade chamber 8. The microbubbles (microbubbles) can be formed as a microbubble region where a large number of microbubbles are generated.

  Here, the pressure in the first introduction chamber 13 and the second introduction chamber 14 (in this embodiment, the pressure in the first introduction chamber 13 (here, the first introduction chamber 13 and the second introduction chamber 13). The chamber 14 is provided with a pressure gauge 80 for measuring the same pressure when the shutter valve 46 is closed.

[Coating with liquid repellent material]
By the way, in this dispersive mixing system 100, the entire surface of the dispersive mixing pump Y in contact with the liquid, or at least a part thereof, for example, a portion of the dispersive mixing pump Y that is rotationally driven, and further discharged from the dispersive mixing pump Y. The surface of the member provided in the circulation channel 16 that circulates the liquid to the dispersion mixing pump Y contacts the liquid, or at least a part of the surface is coated with a liquid repellent material.

  In this case, as the liquid repellent material, a fluororesin, particularly a modified fluororesin, can be preferably used.

FIG. 9 shows the action and effect obtained by coating a liquid repellent material such as a modified fluororesin.
The photograph in FIG. 9 shows the experimental results comparing the state of discharge of slurry from the stirring tank between SUS304 coated with modified fluororesin and SUS304 as it is. It was confirmed that by performing the coating process, the remaining amount is reduced (becomes 0) and the discharge time can be shortened as compared with the case of SUS304.

10 and Table 1 show the surface treatment of SUS (PTFE (tetrafluoroethylene resin), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), modified fluororesin, ETFE (tetrafluoroethylene (Ethylene copolymer) and SUS (no surface treatment) and comparative examples (PP (polypropylene), PE (polyethylene), glass)), various slurries (acrylic binder (for HC negative electrode) (aqueous), CMC-SBR ( Carboxymethylcellulose-styrene phthalogen copolymer) binder (for SiO-HC negative electrode) (aqueous), acrylic binder (for LTO negative electrode) (aqueous), PVdF (polyvinylidene fluoride) binder (for SiO-HC negative electrode) (solvent) ) Shows the experimental results comparing the water and oil repellency of .
Here, the evaluation of adhesiveness (water repellency / oil repellency) in Table 1 was performed in order to eliminate the influence of the difference in viscosity for each slurry. This was performed by relatively evaluating three items: (2) the distance from the start position to the uppermost droplet trace, and (3) the wet width of the liquid trace.

From the photograph of FIG. 10 and the experimental results shown in Table 1, the following could be confirmed.
(1) When a modified fluororesin is coated on a SUS material, the slurry is difficult to adhere and is easy to clean.
(2) No significant difference is observed in the slurry containing a large amount of foam.
(3) Some SUS materials are likely to adhere depending on the type of slurry.

Next, under the conditions for preparing the CMC solution shown in Table 2, SUS304 was coated with a modified fluororesin (the place where the coating process was performed: scraped blade 9, partition plate 15, storage and mixing tank 51, and cylindrical container ( The surface of the separation part) 71 (the surface on which the slurry (liquid) contacts) (Test 1 (Example)) and the same as SUS304 (Test 2 (Comparative Example)) constitute the dispersion mixing system 100 to obtain the CMC solution. Table 3 shows the experimental results of the above.
In Table 3, the degree of decompression (MPa) is the pressure in the first introduction chamber 13 measured by the pressure gauge 80 (here, the first introduction chamber 13 and the second introduction chamber 14 are provided with the shutter valve 46). The pressure is almost the same in the closed state.)

From the experimental results shown in Table 3, SUS304 was coated with a modified fluororesin (the place where the coating process was performed: the slurry of the scraping blade 9, the partition plate 15, the storage and mixing tank 51, and the cylindrical container (separator) 71) It was confirmed that the (surface on which (liquid) is in contact) has the following operational effects as compared to the SUS304.
(1) In a dispersion mixing system that generates a shearing force in a liquid, coating the inner surface of a device that is in contact with the liquid with a liquid repellent material reduces the shearing force applied to the liquid, resulting in efficient dispersion mixing. In the dispersive mixing system 100 equipped with the dispersive mixing pump Y, the flow resistance of the liquid is reduced by the coating treatment with the liquid repellent material, and the first introduction is performed. As the degree of pressure reduction (MPa) in the chamber 13 (here, the first introduction chamber 13 and the second introduction chamber 14 are substantially the same pressure when the shutter valve 46 is closed) increases, the negative pressure increases. Generation of local boiling (cavitation) generated in a pressure state can be promoted, and more efficient dispersive mixing can be performed. That is, immediately after a bubble (cavity) due to local boiling (cavitation) generated on the back surface 9 a of the scraping blade 9 in a negative pressure state passes through the through hole 7 b on the second introduction chamber 14 side of the stator 7, the blade By being pulverized into finer bubbles by the rotating blades 6 rotating at a high speed in the chamber 8, the slurry F becomes foamy, and the agglomerated powder P is unraveled and promoted to disperse.
(2) Since the flow resistance of the liquid is reduced and dispersion mixing can be performed at a low rotational speed, the power consumption can be reduced, the heat generation of the liquid can be suppressed, and a high-quality slurry without thermal history can be produced. can do.
(3) The slurry recovery rate can be improved by the liquid repellency.
(4) By using a fluororesin, especially a modified fluororesin, as the liquid repellent material, the surface hardness is increased, so that wear is reduced and contamination can be prevented. Since the polyimide resin is a constituent material of the negative electrode of the next generation battery, it is possible to prevent the problem of contamination.

[Operation of distributed mixing system]
Next, the operation of the dispersion mixing system 100 will be described.
First, the quantitative supply device X is stopped, the shutter valve 46 is closed, and the suction of the powder P through the powder discharge pipe 45 is stopped, and only the solvent R is supplied from the storage and mixing tank 51 of the solvent supply unit 50. While rotating the rotor 5, the operation of the dispersion mixing pump Y is started. When the predetermined operating time has elapsed and the inside of the dispersion mixing pump Y is in a negative pressure state, the shutter valve 46 is opened. As a result, the expansion chamber 47 of the quantitative supply device X is brought into a negative pressure state, and the inside of the introduction part 41 and the vicinity of the lower opening 31b of the hopper 31 are brought into a pressure state between the negative pressure state and the atmospheric pressure state.

Then, the quantitative supply device X is operated, and the powder P stored in the hopper 31 is quantitatively supplied from the lower opening 31b of the hopper 31 by the stirring action of the stirring blade 32A and the negative pressure suction force of the dispersion mixing pump Y. Through the expansion chamber 47 of the section 40, a predetermined amount is continuously supplied in a predetermined amount to the mixing member 61 of the mixing mechanism 60. In parallel, the delivery pump 52P of the solvent supply unit 50 is operated, and the solvent R is continuously supplied in a predetermined amount to the mixing member 61 of the mixing mechanism 60 by the negative pressure suction force of the dispersion mixing pump Y.
From the mixing member 61 of the mixing mechanism 60, the powder P is supplied to the first supply unit 11 through the cylindrical part 62 of the mixing member 61, and the solvent R passes through the annular slit 63 and has a hollow cylindrical shape without a break. The powder P and the solvent R are premixed by the first supply unit 11 in the state of the vortex flow, and the preliminary mixture Fp is introduced into the annular groove 10.

When the rotor 5 is driven to rotate and the partition plate 15 rotates integrally with the rotor 5, the scraping blade 9 provided concentrically on the partition plate 15 is fitted into the annular groove 10 with the tip portion 9 </ b> T. Circulate in a state.
As a result, as shown by solid arrows in FIGS. 4 and 5, the preliminary mixture Fp that flows through the first supply unit 11 and is introduced into the annular groove 10 is inserted into the annular groove 10 and scraped around. The preliminary mixture Fp scraped out by the tip portion 9T of the blade 9 is roughly divided into the front surface of the funnel-shaped portion 15b of the partition plate 15 and the annular flat plate portion 15c in the first introduction chamber 13. It flows in the rotational direction of the rotor 5 along the front surface, and further flows through the through hole 7a on the first introduction chamber 13 side of the stator 7 and flows into the blade chamber 8. It flows in the rotation direction and is discharged from the discharge part 12.

The preliminary mixture Fp introduced into the annular groove 10 undergoes a shearing action when it is scraped by the tip 9T of the scraping blade 9. In this case, between the outward side surface 9o of the tip portion 9T of the scraping blade 9 and the inward inner surface of the inner annular groove 10, and the inward side surface 9i of the tip portion 9T of the scraping blade 9 and the inner annular groove. A shearing action acts between the ten outwardly facing inner surfaces. At the same time, the so-called local boiling (cavitation) occurs on the rear surface 9a on the rear side in the rotational direction of the scraping blade 9 as the scraping blade 9 rotates. Further, when the stator 7 passes through the through hole 7 a on the first introduction chamber 13 side, a shearing action is exerted.
That is, since the shear force can be applied to the preliminary mixture Fp in the first introduction chamber 13 and local boiling can be generated, the preliminary mixture Fp to be scraped out is the scraping blade 9 and the first introduction chamber 13. While being mixed by receiving a shearing action from the side through-hole 7a, the powder P is more favorably dispersed in the solvent R due to local boiling (cavitation) generated on the back surface 9a of the scraping blade 9. . Therefore, such a preliminary mixture Fp can be supplied, and good dispersion of the powder P with respect to the solvent R in the blade chamber 8 can be expected.

  The slurry F discharged from the discharge unit 12 is supplied to the recirculation mechanism unit 70 through the discharge path 18, and in the recirculation mechanism unit 70, the undispersed slurry Fr including the powder P that is not completely dispersed and mixed. And the slurry P in which the powder P is almost completely dispersed and mixed, and the bubbles of the solvent R are separated, and the undispersed slurry Fr is rotated by a pump drive motor M4. The slurry F is supplied again to the second supply unit 17 of the dispersion mixing pump Y through the circulation flow path 16 with 16P interposed therebetween, and the slurry F is supplied to the storage mixing tank 51 through the discharge path 22.

  The undispersed slurry Fr is introduced into the second introduction chamber 14 in a state where the flow rate is restricted via the throttle portion 14 a of the second supply portion 17. In the second introduction chamber 14, it is subjected to shearing action by a plurality of rotating stirring blades 21, and is further finely crushed, and also when passing through the through hole 7 b on the second introduction chamber 14 side. It is crushed under shearing action. In this case, the air is introduced into the blade chamber 8 in a state where the flow rate is limited through the through hole 7b on the second introduction chamber 14 side. Then, in the blade chamber 8, the slurry F, which is crushed by the shearing action by the rotating blade 6 rotating at high speed and further reduced in the aggregate (dama) of the powder P, is discharged from the first introduction chamber 13. It is mixed with the slurry F and discharged from the discharge unit 12.

Here, the control unit is configured to be able to control the peripheral speed of the rotor blade 6 (the number of rotations of the rotor 5), and the pressure in the first introduction chamber 13 and the second introduction chamber 14 is in a predetermined negative pressure state. Thus, by setting the peripheral speed (rotation speed of the rotor 5) of the rotor blade 6 and rotating the rotor blade 6 at the set peripheral speed (rotation speed of the rotor 5), at least the first speed of the stator 7 is reached. The region in the blade chamber 8 immediately after passing through the through hole 7a on the first introduction chamber 13 side and the through hole 7b on the second introduction chamber 14 side is continuously spread over the entire circumference in the blade chamber 8. It can be formed as a fine bubble region where a large number of R fine bubbles (microbubbles) are generated.
As a result, the solvent R penetrating into the aggregate (so-called lumps) of the powder P is foamed over the entire circumference of the blade chamber 8 to promote the crushing of the aggregate. Dispersion of the powder P is further promoted by the impact force when the bubbles are pressurized and disappeared in the blade chamber 8, and as a result, almost the entire slurry F existing in the entire circumference of the blade chamber 8 is covered. A high-quality slurry F with good dispersion of the powder P in the solvent R can be produced.

When the supply of a predetermined amount of the powder P from the hopper 31 of the fixed amount supply device X is finished, the fixed amount supply device X is stopped and the shutter valve 46 provided in the powder discharge pipe 45 is closed to close the powder. The suction of the powder P through the discharge pipe 45 is stopped.
Thereby, when the powder P is not supplied, it is possible to prevent the powder discharge pipe 45 inside the upstream side of the shutter valve 46 from being wetted and blocked, and at the same time, the first of the dispersion mixing pump Y. It is possible to prevent air from being sucked from the supply unit 11.

In this state, the operation of the dispersion mixing pump Y is continued for a predetermined time.
At this time, the slurry F replaced with the solvent R is supplied from the storage and mixing tank 51 of the solvent supply unit 50.
When the powder P is not supplied, air is not sucked from the first supply unit 11, so that the inside of the dispersion mixing pump Y, that is, the first introduction chamber 13 and the second introduction chamber. 14 (the first introduction chamber 13 and the second introduction chamber 14 have substantially the same pressure when the shutter valve 46 is closed), so that the set peripheral speed (rotor 5), the blade chamber immediately after passing through the through hole 7a on the first introduction chamber 13 side and the through hole 7b on the second introduction chamber 14 side of the stator 7 at least. The region in 8 can be formed continuously as a fine bubble region in which many fine bubbles (microbubbles) of the solvent R are generated over the entire circumference in the blade chamber 8.
As a result, the solvent R penetrating into the aggregate (so-called lumps) of the powder P is foamed over the entire circumference of the blade chamber 8 to promote the crushing of the aggregate. Dispersion of the powder P is further promoted by the impact force when the bubbles are pressurized and disappeared in the blade chamber 8, and as a result, almost the entire slurry F existing in the entire circumference of the blade chamber 8 is covered. Thus, it is possible to more reliably produce a high-quality slurry F in which the powder P is well dispersed in the solvent R.
The generated high-quality slurry F is stored in the storage and mixing tank 51.

Thereafter, the operation of the dispersion mixing pump Y is stopped.
The generated high-quality slurry F stored in the storage and mixing tank 51 is supplied to the subsequent process via the discharge path 53 of the slurry F.

[Production of slurry containing carbon]
Next, the manufacturing method of the slurry containing carbon using the dispersion | distribution mixing system 100 provided with this dispersion | distribution mixing pump Y is demonstrated.
This carbon-containing slurry manufacturing method is a slurry material used for manufacturing a non-aqueous electrolyte secondary battery electrode as a liquid containing carbon as a solid, specifically, powder P (solid). A material that occludes and releases alkali metal ions (for example, LiFePO ₄ ), carbon (for example, carbon black or fibrous carbon powder, the aspect ratio of the fibrous carbon powder is 10 to 1000, and the average fiber diameter is 1. Using carbon (carbon nanotubes) of ~ 500 nm and an aqueous binder (for example, CMC (carboxylmethylcellulose)), using water as the solvent R, and applying shearing force to the liquid, dispersion and mixing of solids It is a manufacturing method of the slurry containing carbon provided with the process to perform, Comprising: The said shear force is -0.025-- It is characterized in applying a negative pressure state in the range of .10MPa.

Here, the negative pressure state is the pressure in the first introduction chamber 13 and the second introduction chamber 14 measured by the pressure gauge 80 (in this embodiment, the pressure in the first introduction chamber 13 (here, The first introduction chamber 13 and the second introduction chamber 14 have substantially the same pressure when the shutter valve 46 is closed.
That is, in the present embodiment, the fixed amount supply device X is stopped, the shutter valve 46 disposed in the powder discharge pipe 45 is closed, and the suction of the powder P through the powder discharge pipe 45 is stopped. When the dispersive mixing pump Y is operating (when the powder P is not supplied), the pressure in the first introduction chamber 13 and the second introduction chamber 14 is −0.01 to −0.10 MPa, preferably Is the peripheral speed (rotor 5) of the rotor blade 6 of the dispersion mixing pump Y so that a negative pressure state in the range of -0.03 to -0.09 MPa, more preferably -0.04 to -0.08 MPa. Is set to 6 to 80 m / s, preferably 15 to 50 m / s.

As a result, the solvent R penetrating into the aggregate (so-called lumps) of the powder P is foamed over the entire circumference of the blade chamber 8 to promote the crushing of the aggregate. Dispersion of the powder P is further promoted by the impact force when the bubbles are pressurized and disappeared in the blade chamber 8, and as a result, almost the entire slurry F existing in the entire circumference of the blade chamber 8 is covered. Thus, it is possible to more reliably produce a high-quality slurry F in which the powder P is well dispersed in the solvent R.
That is, immediately after a bubble (cavity) due to local boiling (cavitation) generated on the back surface 9 a of the scraping blade 9 in a negative pressure state passes through the through hole 7 b on the second introduction chamber 14 side of the stator 7, the blade By being pulverized into finer bubbles by the rotor blades 6 rotating at a high speed in the chamber 8, the slurry F becomes foamy and the agglomerated powder P (fibrous carbon powder) is unraveled and dispersed. The
Then, the foamy slurry F moves to the outer peripheral portion of the blade chamber 8 by centrifugal force while being shattered and broken by the rotating blade 6 rotating at high speed in the blade chamber 8, and discharged. While being discharged from the portion 12, during this time, the dispersion of the agglomerated powder P (fibrous carbon powder) contained in the slurry F is further promoted by the impact generated when the foamy slurry F returns to the liquid state. The high-quality slurry F dispersed until the powder P (fibrous carbon powder) becomes primary particles can be generated.

  Thus, although the slurry containing carbon can be obtained, this slurry can be used for manufacture of the electrode for nonaqueous electrolyte secondary batteries.

Although the distributed mixing system of the present invention have been described based on the embodiments, the present invention is not intended to be limited to the description of the above embodiments, as appropriate its configuration without departing from the scope and spirit thereof It can be changed.

Distributed mixing system of the present invention, even when containing the dispersibility and solubility is poor material such as carbon, a homogeneous slurry can be obtained in a short time, also solids dispersion, the mixed state It can be maintained for a long time, and moreover, it is possible to reduce the mixing and remaining of bubbles in the slurry, so that it can be used for the production of various slurries including the production of slurries used for the production of electrodes for non-aqueous electrolyte secondary batteries. It can be used suitably.

DESCRIPTION OF SYMBOLS 1 Casing 5 Rotor 6 Rotary blade 6a Back part 7 Stator 7a Restriction flow path (through-hole)
7b Restricted flow path (through hole)
8 Wing chamber (discharge chamber)
DESCRIPTION OF SYMBOLS 9 Scraping blade 10 Annular groove 11 1st supply part 12 Discharge part 13 1st introduction chamber 14 2nd introduction chamber 14a Restriction part 15 Partition plate 16 Circulation flow path 16P Circulation pump 17 2nd supply part 22 Discharge path 50 Solvent Supply Unit 51 Storage Mixing Tank 52 Supply Pipe 52P Delivery Pump 60 Mixing Mechanism (Supply Mechanism Unit)
70 Recirculation mechanism part 71 Cylindrical container (separation part)
80 Pressure gauge 100 Dispersion mixing system Y Dispersion mixing pump F Slurry Fp Preliminary mixture Fr Undispersed slurry P Powder (solid content)
R solvent (liquid phase dispersion medium)
G Air (gas)

Claims (7)

Dispersion mixing equipped with a dispersion mixing pump used for producing a slurry comprising a step of dispersing and mixing solids by causing cavitation in the liquid by rotating a rotor having rotor blades inside the casing a system, distributed mixing system, characterized in that at least a portion of the surface of the liquid dispersive mixing pump in contact, and so that the coated liquid-repellent material. Distributed mixing system of claim 1, wherein the rotary driven portion of the distributed mixing pump, was such that the coating treatment with the liquid-repellent material. The dispersion mixing system according to claim 2, wherein the rotationally driven portion of the dispersion mixing pump is a rotor blade of the dispersion mixing pump. Distributed mixing system of claim 1, 2 or 3, characterized in that it comprises a circulation flow path of the liquid discharged from the dispersion mixing pump, circulates in the dispersive mixing pump. Distributed mixing system of claim 4, characterized in that formed by at least a portion of said liquid member having a circulation channel in contact surface, so that the coating treatment with the liquid-repellent material. Distributed mixing system of claim 1, 2, 3, 4 or 5, wherein the liquid-repellent material, characterized by comprising the fluorine-based resin. Distributed mixing system of claim 6, wherein the liquid-repellent material, characterized by comprising the modified fluororesin.