JP2009165970A - Stirring apparatus, stirrer, and stirring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stirring apparatus capable of efficiently dispersing agglomerates of agglomerated primary particles contained in a stirred material, the stirred material, and a stirring method. <P>SOLUTION: The stirring apparatus includes: a stirring container in which a stirred material is put; a rotation part for rotating the stirring container; and a stirrer which includes a grinding part for grinding agglomerates contained in the stirred material and a drawing-in part for drawing the stirred material into the grinding part, is installed in the stirring container together with the stirred material, and has a circular outer circumferential face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stirring device, a stirring bar, and a stirring method. The present invention particularly relates to a stirrer, a stirrer, and a stirring method that have a circular outer peripheral surface and efficiently grind agglomerates contained in the stirrer.

Conventionally, a stirrer used when stirring a liquid is known. For example, Patent Document 1 discloses a stirrer that has a kamaboko shape and has a raised bottom center portion. The stirrer described in Patent Document 1 has an iron core embedded in the lower part of the stirrer and is devised so as not to fall down. Patent Document 2 discloses a planetary stirring device that revolves around a revolution axis while rotating a stirring vessel.
JP-A-4-57238 JP 2000-84388 A

  Since the bottom center part of the stirrer described in Patent Document 1 is raised, when used in the planetary stirrer described in Patent Document 2, the stirrer easily jumps up and down. Furthermore, since it has protrusions or corners, it cannot slide smoothly in the stirring vessel. As a result, the stirrer described in Patent Document 1 could not be used for the purpose of dispersing aggregates in which primary particles aggregated in a liquid. In particular, when the primary particles are particles of several microns to submicron, they cannot be finely dispersed.

  In order to solve the above-mentioned problems, in the first embodiment of the present invention, a stirring container in which a stirring material is put, a rotating unit that rotates the stirring container, and grinding that grinds the aggregates contained in the stirring material. There is provided a stirrer including a stirring part having a circular outer peripheral surface, which has a suction part for bringing the stirring part and the stirring part into the grinding part, and is placed in the stirring container together with the stirring part.

  In the second embodiment of the present invention, the agglomerate contained in the agitation is ground between the inner surface of the agitation container, a grinding part, the agitation part for bringing the agitation into the grinding part, and a circular shape. A stirrer including an outer peripheral surface is provided. In the third embodiment of the present invention, the outer shape of the stirrer has a substantially cylindrical shape, and is opposed to the inner bottom surface of the stirring vessel. A step of preparing a stirrer having an inclined portion for connecting, a step of putting a stirrer and the stirrer in the stirring vessel, and a step of rotating the stirring vessel by a rotating unit, the step of rotating the stirring vessel Then, a stirring method is provided in which the agitated material is attracted between the inner bottom surface and the inclined portion, and the aggregates contained in the agitated material are ground by sliding between the inner bottom surface and the facing surface.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention. Hereinafter, embodiments will be described with reference to the drawings. In the description of the drawings, the same or similar parts may be denoted by the same reference numerals and redundant description may be omitted. The drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio, and the like may be different from the actual ones. For convenience of explanation, there may be a case where the dimensional relationship or ratio is different between drawings.

  FIG. 1 shows a cross-sectional view of the stirring device 10 of the present embodiment cut along a plane perpendicular to the horizontal direction. The stirring device 10 includes a stirring container 100, a rotating unit 104, and a stirrer 108, and grinds the agglomerates 24 contained in the stirred product 20 contained therein. The stirring container 100 may have a bottomed cylindrical shape, and the stirring container 100 includes a lid part 110, a peripheral wall part 112, a bottom plate part 114, and casters 116. The lid portion 110 is disposed on the upper portion of the stirring vessel 100 and may have a disk shape. The peripheral wall portion 112 may be cylindrical and includes an outer wall surface 122 facing the outside of the stirring vessel 100 and an inner wall surface 124 facing the inside of the stirring vessel 100. The bottom plate portion 114 is disposed on the bottom portion of the stirring vessel 100 and may have a disk shape. The bottom plate portion 114 includes an outer bottom surface 132 facing the outside of the stirring container 100 and an inner bottom surface 134 facing the inside of the stirring container 100. The inner bottom surface 134 forms the inner surface 118 together with the inner wall surface 124. For example, a ball caster is used as the caster 116, and the caster 116 is arranged on the outer bottom surface 132 of the bottom plate portion 114 to reduce the sliding friction of the stirring vessel 100.

  The lid portion 110, the peripheral wall portion 112, and the bottom plate portion 114 may be a resin such as polypropylene, a fluororesin, or rubber, or may be a metal such as stainless steel (SUS). The bottom plate portion 114 may be formed integrally with the peripheral wall portion 112, and the bottom plate portion 114 may be smoothly coupled to the peripheral wall portion 112. The stirring vessel 100 may be a cylindrical shape made of polypropylene and having an inner diameter of 56 mm. In the embodiment, the side on which the lid part 110 is arranged may be referred to as the upper side, and the side on which the bottom plate part 114 is arranged may be referred to as the lower side. However, such description does not limit the use of the stirring vessel 100 in the illustrated direction.

  The rotating unit 104 may be a so-called planetary rotating device, and rotates the stirring container 100. The rotating unit 104 may rotate the stirring container 100 while revolving the stirring container 100 around a revolution axis A1 perpendicular to the horizontal. The rotating unit 104 includes a revolution container 140, a crank 150, a bearing 152, and a shaft 154. The rotating unit 104 includes a motor 156, a balance weight 158, a support unit 160, and a leg unit 162. The revolution container 140 may have a bottomed cylindrical shape whose inner diameter is larger than the outer diameter of the stirring container 100, and the stirring container 100 is disposed inside the revolution container 140.

  The revolution container 140 includes a cylinder wall part 142, a cylinder bottom part 144, and a shaft part 146. The cylindrical wall portion 142 may have a cylindrical shape that extends along the rotation axis A <b> 2 of the revolution container 140. The tube bottom portion 144 is coupled to one end of the tube wall portion 142 and is disposed on the bottom portion of the revolving container 140, may have a disk shape, and may be formed integrally with the tube wall portion 142. The cylinder wall part 142 and the cylinder bottom part 144 may be a resin such as polypropylene, fluororesin, or rubber, or may be a metal such as stainless steel. The shaft portion 146 is disposed outside the cylinder bottom portion 144 and extends along the rotation axis A <b> 2 of the revolution container 140 from the center of the tube bottom portion 144 toward the outside of the rotating portion 104. The revolution container may be a cylindrical shape made of a fluororesin and having an inner diameter of 100 mm.

  The crank 150 may have a prismatic shape extending in the horizontal direction, and supports the revolution container 140. The bearing 152 is disposed at one end of the crank 150, and the shaft portion 146 of the revolution container 140 is inserted, so that the bearing 152 rotatably supports the revolution container 140. The motor 156 is coupled to the crank 150 via the shaft 154, and rotates the crank 150 about the revolution axis A1. A balance weight 158 may be disposed at the other end of the crank 150. The support part 160 may be a frame that supports the motor 156, and the leg part 162 may support the support part 160 from below. In addition, rotation of the revolution container 140 can be suppressed by combining the revolution container 140 and the support part 160 through an elastic member, for example.

  Next, the outline of the operation of the rotating unit 104 will be described with reference to FIG. By the motor 156 or the like, the revolution container 140 can revolve around the revolution axis A1 while suppressing rotation. When the revolution container 140 revolves, the stirring container 100 disposed inside revolves around the revolution axis A <b> 1 along with the revolution container 140. The stirring vessel 100 that has started to revolve is pressed against the inner surface of the cylindrical wall portion 142 by sliding on the inner surface of the cylindrical bottom portion 144 by the action of centrifugal force. The stirring vessel 100 rotates about the rotation axis A <b> 3 so as to roll on the inner surface of the cylindrical wall portion 142 by a frictional force acting between the outer wall surface 122 and the cylindrical wall portion 142. Here, the rotation axis A2 of the revolution container 140 may be inclined with an inclination angle S1 toward the revolution axis A1. Thereby, the revolution container 140 always inclines to the revolution axis A1 side during revolution. Accordingly, the centrifugal force acting on the stirring container 100 has two components, that is, a force that presses the stirring container 100 against the cylindrical wall part 142 and a force that presses the stirring container 100 against the cylindrical bottom part 144.

  The stirrer 108 is placed in the stirring vessel 100 together with the stirring material 20. The outer diameter of the stirring bar 108 may be smaller than the radius of the inner wall surface 124. When the revolution container 140 revolves, the stirrer 108 revolves around the revolution axis A <b> 1 along with the revolution container 140. The stirrer 108 that has started revolving is pressed against the inner wall surface 124 of the stirring vessel 100 by the action of the centrifugal force F1. The stirrer 108 rotates about the rotation axis A4 so as to roll on the inner wall surface 124 by a frictional force acting between the outer wall surface 122 and the like. Here, when the rotation axis A2 of the revolution container 140 is inclined toward the revolution axis A1, the centrifugal force F1 acting on the stirrer 108 is “a pressing force F2” that presses the stirrer 108 against the inner wall surface 124. , Two components of “pressing force F3” for pressing the stirring bar 108 against the inner bottom surface 134 are included. Thereby, the revolution container 140 causes the action of the pressing force F <b> 2 that the stirrer 108 is pressed against the inner wall surface 124 of the stirring container 100 and the stirring bar 108 presses against the inner bottom surface 134 of the stirring container 100 by the rotation of the stirring container 100. The applied pressing force F3 is applied to the stirrer 108.

  FIG. 2 shows an outline of the rotational motion of the stirring vessel 100, the stirring bar 108, and the revolution vessel 140. The revolution container 140 revolves around the revolution axis A1 in a clockwise direction, for example, while suppressing rotation. The stirring container 100 revolves around the revolution axis A1 in a clockwise direction together with the revolution container 140. Since the rotation of the revolution container 140 is suppressed, the stirring container 100 rotates in the direction opposite to the revolution direction of the revolution container 140, that is, counterclockwise. The stirrer 108 revolves clockwise around the revolution axis A1 together with the stirring container 100, and rotates in the same direction as the rotation of the stirring container 100, that is, counterclockwise by the rotation of the stirring container 100. In addition, although the case where the revolution container 140 was rotating clockwise around the revolution axis A1 was demonstrated, the rotation direction of the revolution container 140 is not restricted to this.

  1 and 2, the revolution container 140 revolves around the revolution axis A <b> 1 while suppressing rotation, so that the stirring container 100 rolls on the inner surface of the cylindrical wall 142 of the revolution container 140. Although the case where it rotates about the rotation axis A3 has been described, the method by which the rotating unit 104 rotates the stirring container 100 is not limited to this. As another method, for example, the stirring vessel 100 is fixed inside the revolution vessel 140, and the revolution vessel 140 is rotated around the rotation axis A2 while rotating around the revolution axis A2, so that the stirring vessel 100 is You may make it revolve around the revolution axis A1 while rotating. At this time, the stirring vessel 100 may be fixed to the revolution vessel 140 such that the rotation axis A3 is substantially collinear with the rotation axis A2 of the revolution vessel 140. Further, the outer diameter of the stirring container 100 may be substantially the same as the inner diameter of the revolution container 140, and the outer wall surface 122 of the stirring container 100 may be fixed so as to contact the cylindrical wall portion 142 of the revolution container 140.

  FIG. 3 shows an example of a side view showing the stirring bar 108 of the present embodiment. FIG. 4 shows an example of a bottom view showing the stirring bar 108 of the present embodiment. Hereinafter, the stirrer 108 will be described with reference to FIGS. 3 and 4. As shown in FIG. 3, the stirrer 108 may have a rotating body shape with the rotation axis A4 as an axis of symmetry. Thereby, abrasion of the stirring bar 108 can be reduced. The stirrer 108 may be formed in plane symmetry with a plane P that is perpendicular to the rotation axis A4 and includes the center of the stirrer 108 as a symmetry plane. Thereby, the external shape of the stirring bar 108 is formed symmetrically in the vertical direction.

  First, the function of the stirring bar 108 will be described. The stirrer 108 includes a grinding unit 200 and a calling unit 202. The grinding unit 200 has a function of grinding the agglomerates 24 included in the agitated material 20. The grinding unit 200 grinds the agglomerates 24 included in the stirring material 20 with the inner surface 118 of the stirring container 100. The primary particles 22 contained in the stirring material 20 are aggregated to form an aggregate 24. The stirrer 108 can pulverize the aggregate 24 with an appropriate force to break up the aggregate 24 and disperse it to the primary particles 22.

  The calling unit 202 has a function of calling the agitated material 20 into the grinding unit 200. The call-in part 202 may be arranged in connection with the grinding part 200. Thereby, since the aggregate 24 is efficiently supplied to the grinding part 200, the primary particles 22 can be efficiently dispersed. Note that the functions of the grinding unit 200 and the calling unit 202 are exhibited at a plurality of locations of the stirrer 108. Furthermore, both functions are not clearly distinguishable, and a member constituting the grinding portion 200 may have the function of the calling portion 202, and a member constituting the calling portion 202 has the function of the grinding portion 200. May be.

  Next, an example of the configuration of the stirring bar 108 will be described with reference to FIG. The stirrer 108 has an outer peripheral surface 210, a facing surface 240, and an upper surface 250. The outer peripheral surface 210 is formed so as to extend in the direction of the rotation axis A4 of the stirrer 108 and connect the opposing surface 240 and the upper surface 250. The outer peripheral surface 210 may have a circular outer shape, for example, may have a substantially cylindrical outer shape extending in the direction of the rotation axis A4. As a result, the stirrer 108 has a circumferential surface extending in the direction of the rotation axis A4, so that the area in contact with the inner wall surface 124 of the stirring vessel 100 is increased, and wear of the stirrer 108 and the inner wall surface 124 is reduced. The stirrer 108 can stably rotate inside the stirring vessel 100. The outer peripheral surface 210 may be formed in accordance with the shape of the inner wall surface 124 of the stirring vessel 100, and at least at one end in the direction of the rotation axis A4 of the substantially cylindrical outer shape, the outer diameter becomes smaller toward the end. May be.

  The outer peripheral surface 210 includes a side surface 212 and an outer peripheral inclined portion 214. The side surface 212 may be disposed near the center of the stirring bar 108 in the direction of the rotation axis A4. The side surface 212 may have a substantially cylindrical outer shape. The side surface 212 may be formed to face the inner wall surface 124 of the stirring vessel 100. The side surface 212 may be an example of the ground portion 200. The outer peripheral inclined portion 214 is arranged so as to connect the side surface 212 and the opposing surface 240 or the upper surface 250. The outer peripheral inclined portion 214 may have a smaller diameter from the side surface 212 toward the opposing surface 240 or the upper surface 250. The outer peripheral inclined portion 214 may be an example of the calling portion 202.

  The outer peripheral inclined portion 214 may include a tapered portion 222, an R portion 224, a tapered portion 226, and an R portion 228. The tapered portion 222 and the R portion 224 may be disposed on the upper surface 250 side from the side surface 212, and the tapered portion 226 and the R portion 228 may be disposed on the opposing surface 240 side from the side surface 212. The tapered portion 222 and the tapered portion 226 linearly connect the side surface 212 and the opposing surface 240 or the upper surface 250, and the tapered portion 222 and the tapered portion 226 have an outer shape in which a part of a conical shape is cut out. The R portion 224 and the R portion 228 smoothly connect the side surface 212 and the facing surface 240 or the upper surface 250.

  The tapered portion 222 may form an acute angle S2 with the upper surface 250, and the tapered portion 226 may form an acute angle S2 with the facing surface 240. As a result, the distance between the surface including the facing surface 240 and the outer peripheral surface 210 gradually decreases along the taper portion 226 from the side surface 212 toward the facing surface 240. The tapered portion 222, the tapered portion 226, the R portion 224, and the R portion 228 may be an example of the calling portion 202. For example, the tapered portion 226 is not a flat surface, and the R portion 228 or the side surface 212 and the facing surface 240 are not provided. It may be a curved surface that connects smoothly.

  The facing surface 240 is disposed so as to face the inner bottom surface 134 of the stirring container 100 when the stirring bar 108 is placed in the stirring container 100. As shown in FIG. 4, the facing surface 240 may be a flat surface. The facing surface 240 may be an example of the ground portion 200. The upper surface 250 is disposed at a position facing the facing surface 240 of the stirring bar 108. The upper surface 250 may be disposed substantially parallel to the facing surface 240.

  FIG. 5 shows a stir bar 508 of another embodiment. FIG. 5 is a cross-sectional view of the stirrer 508 cut along the rotation axis A4 in the vicinity of the center of the stirrer 508. FIG. FIG. 5 shows an outline of a state in which the stirring object 20 and the stirring bar 508 are put in the stirring container 100 and the stirring container 100 is rotated by the rotating unit 104.

  First, an example of the configuration of the stirring bar 508 will be described. Stirrer 508 has an outer peripheral surface 510, a bottom portion 530, and an upper surface 250. The outer peripheral surface 510 is formed so as to extend in the direction of the rotation axis A4 of the stirrer 508 corresponding to the outer peripheral surface 210 so as to connect the upper surface 250 and the opposing surface 540. Outer peripheral surface 510 includes a side surface 512, an R portion 524, and an R portion 528. The side surface 512 may have a substantially cylindrical outer shape corresponding to the side surface 212. The R portion 524 may smoothly connect the side surface 512 and the upper surface 250, the R portion 528 may smoothly connect the side surface 512 and the facing surface 540, and the R portion 528 may be connected to the inner bottom surface 134 of the stirring vessel 100. An acute angle S4 may be formed. The R unit 528 may be an example of the calling unit 202.

  The bottom portion 530 includes a facing surface 540 and a groove 542. Here, the “bottom portion” refers to a portion that is perpendicular to the rotation axis A4 and that is closer to the facing surface 540 than the plane P that includes the center of the stirring bar 508. The facing surface 540 faces the inner bottom surface 134 of the stirring vessel 100 at the bottom 530, and the facing surface 540 may be a flat surface. Thereby, the facing surface 540 grinds the aggregate 24 contained in the agitated material 20 by the sliding of the inner bottom surface 134 and the facing surface 540 and disperses them to the primary particles 22. The facing surface 540 may be an example of the ground portion 200.

  The groove 542 may be formed on the bottom surface of the stirring bar 508 at the bottom portion 530. The groove 542 may have a linear shape extending over the entire length in the radial direction. For example, the width W of the groove 542 may be about 500 μm, and the depth D of the groove 542 may be about 500 μm. The groove 542 may be disposed so as to pass through the center of the bottom surface, whereby a pair of opposed surfaces 540 are formed on the bottom surface of the stirring bar 508 at the bottom portion 530. The groove 542 may be an example of the calling portion 202, and the groove 542 includes a groove wall portion 544, a groove inclined portion 546, and a groove inclined portion 548. The groove wall portion 544 may have a U-shaped cross section, and the groove inclined portion 546 and the groove inclined portion 548 are planes that connect both ends of the open end of the groove wall portion 544 and the facing surface 540. Good. The groove inclined portion 546 and the groove inclined portion 548 may form an acute angle S3 with the inner bottom surface 134 of the stirring vessel 100. The position where the groove 542 is disposed is not limited to the bottom surface, and may be disposed on the side surface 512 or the outer peripheral inclined portion 214.

  Next, the mechanism by which the aggregate 24 is ground will be described with reference to FIG. The stirrer 508 slides in the stirring vessel 100 while rotating. At this time, the stirrer 508 draws the agitated material 20 into the gap between the inner bottom surface 134 and the facing surface 540 through the gap between the inner bottom surface 134 and the R portion 528. Here, “stirring” the stirring material 20 by the stirring bar 508 is not limited to the case where the stirring object 20 is drawn to the vicinity of the stirring bar 508 by the rotation of the stirring bar 508. When the stirrer 508 slides on the inner bottom surface 134, the case where the stirrer 508 passes over the stirrer 20 existing in the traveling direction of the stirrer 508 is also included in the “call-in”. Furthermore, the case where the agitated material 20 collides with or approaches the stirrer 508 due to the flow of the agitated material 20 in the agitating container 100 is also included in the “calling”.

  Since the R portion 528 smoothly connects the side surface 512 and the facing surface 540, the gap between the bottom portion 530 and the inner bottom surface 134 gradually narrows from the side surface 512 toward the facing surface 540. Since the facing surface 540 is connected to the R portion 528, the aggregate 24 cannot be directly caught in the gap between the inner bottom surface 134 and the facing surface 540. The agitation material 20 includes agglomerates 24 of various sizes, but the agglomerate 24 can only approach the facing surface 540 to a position corresponding to the size, and the agglomerate 24 has an inner bottom surface 134. And the R portion 528, the aggregate 24 is gradually crushed and gradually becomes smaller toward the facing surface 540.

  The aggregate 24 that has passed through the gap between the inner bottom surface 134 and the R portion 528 and has been drawn into the gap between the inner bottom surface 134 and the facing surface 540 is crushed by sliding between the inner bottom surface 134 and the facing surface 540. To be crushed. Since the aggregate 24 is formed by aggregation of the primary particles 22, the aggregate 24 is dispersed to the primary particles 22. According to the above configuration, the size of the aggregate 24 when drawn into the facing surface 540 can be made uniform, and it is possible to suppress the primary particles 22 from being pulverized by applying a force to one place.

  Here, for example, when the rotation axis A <b> 2 of the revolution container 140 is inclined toward the revolution axis A <b> 1, the rotating unit 104 presses the facing surface 540 of the stirrer 508 against the inner bottom surface 134 of the stirring container 100. F3 is fed to the stir bar 508. As a result, the stirring bar 508 slides inside the stirring vessel 100 while being pressed against the inner bottom surface 134. As a result, the force with which the facing surface 540 grinds the aggregate 24 increases. Furthermore, the stirring bar 508 can slide on the inner bottom surface 134 stably in the stirring vessel 100.

  The stirrer 508 also draws the agitated material 20 between the inner wall surface 124 and the R portion 524. The aggregate 24 contained in the agitated material 20 that has been attracted is attracted to the gap between the side surface 512 and the inner wall surface 124 while being gradually crushed and reduced in size. The stirrer 508 may grind the aggregate 24 by sliding between the side surface 512 and the inner wall surface 124. For example, when the stirrer 508 is applied to the stirrer 10, a stirring method including a step of putting the stirring material 20 and the stirrer 508 into the stirring vessel 100 and a step of rotating the stirring vessel 100 by the rotating unit 104 can be provided. In the step of rotating the stirring container 100 of the stirring method, the stirring material 20 is attracted between the inner bottom surface 134 and the R portion 528, and the agglomeration contained in the stirring material 20 is caused by sliding between the inner bottom surface 134 and the facing surface 540. Grind the object 24.

  FIG. 6 shows an example according to the cross-sectional shape of the groove. The groove 642 includes a groove wall portion 644, a groove inclined portion 646, and a groove inclined portion 648. The groove wall portion 644 has a U-shaped cross section. The groove inclined portion 646 and the groove inclined portion 648 may smoothly connect both ends of the open end of the groove wall portion 644 and the facing surface 540.

  FIG. 7 shows an example according to the cross-sectional shape of the groove. The groove 742 has a groove inclined part 746 and a groove inclined part 748. The groove inclined portion 746 may be a surface inclined with respect to the facing surface 540, and the groove inclined portion 748 may be a surface inclined with respect to the facing surface 540 so as to face the groove inclined portion 746. The groove inclined part 746 and the groove inclined part 748 are coupled to each other at one end. The other end of each of the groove inclined part 746 and the groove inclined part 748 is coupled to the facing surface 540 to form a groove 742 having a V-shaped or triangular cross section.

  FIG. 8 shows a bottom view of a stir bar 508 representing another example of the planar shape of the groove. The stirrer 508 may have arc-shaped grooves 842, and the grooves 842 may be arranged such that the plurality of grooves 842 spread outward from the center of the bottom surface. The groove 842 may be arranged so that the opposing surface 540 is formed in the vicinity of the center of the bottom surface. In the groove 842, the direction R1 from the inner side to the outer side of the arc is substantially the same as the rotation direction R2 of the stirrer 508. May be arranged as follows. Thereby, the groove 842 is easy to attract the agitated material 20. The groove 842 may extend to the vicinity of the center of the bottom surface, and the groove 842 may be connected to another groove near the center of the bottom surface.

  FIG. 9 shows a bottom view of a stirring bar 508 representing another example of the planar shape of the groove. The stirrer 508 may have an arc-shaped groove 942. The groove 942 may be arranged such that the direction R1 from the inner side to the outer side of the arc is opposite to the groove 842.

  FIG. 10 shows a bottom view of a stirring bar 508 representing another example of the planar shape of the groove. The stirrer 508 may have a plurality of linear grooves 1042, and the grooves 1042 may be arranged in a radial pattern. The groove 1042 may be disposed so that the opposing surface 540 is formed near the center of the bottom surface, and the groove 1042 may extend to the vicinity of the center of the bottom surface. The groove 1042 may be connected to another groove near the center of the bottom surface.

  FIG. 11 shows a bottom view of a stirring bar 508 representing another example of the planar shape of the groove. The stirrer 508 may have a groove 1142 having a spiral shape concentric with the stirrer 508. The groove 1142 may be arranged such that the direction R3 from the inner side to the outer side of the spiral is substantially the same as the rotation direction R2 of the stirring bar 508. Thereby, it becomes easy to take in the aggregate 24 inside the groove. The groove 1142 may be arranged such that the direction R4 from the outer side of the spiral toward the inner side is substantially the same as the rotation direction R2 of the stirring bar 508.

  FIG. 12 shows a cross-sectional view of a stir bar 1208 according to another embodiment. FIG. 12 shows a case where the stirrer 1208 is cut in the direction of the rotation axis A4 in the vicinity of the center of the stirrer 1208. FIG. FIG. 12 shows an outline of a state in which the stirring object 20 and the stirring bar 1208 are placed in the stirring container 100 and the stirring container 100 is rotated by the rotating unit 104. FIG. 13 shows an example of a bottom view showing the stirring bar 1208 of this embodiment. Hereinafter, the stirrer 1208 will be described with reference to FIGS. 12 and 13.

  As shown in the figure, the stir bar 1208 includes a facing surface 1240, an upper surface 1250, and a center hole 1260. The facing surface 1240 and the upper surface 1250 correspond to the facing surface 540 and the upper surface 250 of the stirrer 508, respectively. The facing surface 1240 is disposed to face the inner bottom surface 134, and the upper surface 1250 faces the facing surface 1240. Arranged. The stirrer 1208 may include a center hole 1260 at the center. The center hole 1260 may be disposed through the opposing surface 1240 and the upper surface 1250, and the center hole 1260 may be disposed in the vicinity of the rotation axis A4 at the center of the center hole 1260. Thereby, the stirring bar 1208 may have a donut-shaped outer shape.

  Center hole 1260 includes a center hole inclined portion 1262, a center hole inclined portion 1264, and an inner peripheral surface 1266. The center hole inclined portion 1262 is disposed at the end of the center hole 1260 on the upper surface 1250 side, and the center hole inclined portion 1262 connects the inner peripheral surface 1266 and the upper surface 1250. The center hole inclined portion 1264 is disposed at the end of the center hole 1260 on the facing surface 1240 side, and the center hole inclined portion 1264 connects the inner peripheral surface 1266 and the upper surface 1250. The inner diameter of the center hole inclined portion 1262 and the center hole inclined portion 1264 may increase along the rotation axis A4 toward the upper surface 1250 side or the facing surface 1240 side, respectively.

  The center hole 1260 may be an example of the attracting part 202. That is, the stirrer 1208 draws the agitated material 20 into the gap between the inner bottom surface 134 and the opposing surface 1240 via the center hole 1260, and agglomerates contained in the agitated material 20 by sliding between the inner bottom surface 134 and the opposing surface 1240. Object 24 may be crushed. Even in this case, for example, when the rotation axis A2 of the revolution container 140 is inclined toward the revolution axis A1, the rotating unit 104 causes the opposed surface 1240 of the stirrer 1208 to be the inner bottom surface 134 of the stirring container 100. A pressing force F <b> 3 that is pressed onto the stirring bar 1208 is applied to the stirring bar 1208. The stirrer 1208 may also have a groove 542 and the like, similar to the stirrer 508.

  FIG. 14 shows an example of a side view showing the stirring bar 1408 of the present embodiment. FIG. 15 shows an example of a bottom view showing the stirring bar 1408 of this embodiment. Hereinafter, the stirring bar 1408 will be described with reference to FIGS. 14 and 15. The stirrer 1408 may have a groove 1416 on the side surface 512, and the cross-sectional shape and planar shape of the groove 1416 can be formed in the same manner as the groove 542 and the like. The stirrer 1408 may have a groove 1442 formed on the bottom surface, and the cross-sectional shape of the groove 1442 may be an arc shape, and the planar shape of the groove 1442 is a shape that extends from the inside to the outside of the bottom surface. Also good. The planar shape of the groove 1442 may be, for example, a shape surrounded by two arcs connected at one end and the end of the R portion 528, or may be a triangle or a substantially fan shape. The depth of the groove 1442 may be about 500 μm. The groove 1442 may be arranged in a direction in which the agitated material 20 can be easily drawn with the rotation of the stirrer 1408. Thereby, the agitated material 20 that has been drawn in can be effectively pushed toward the vicinity of the center of the bottom surface.

  The effect of the present embodiment was confirmed using a conductive paste containing copper powder and a resin solution. As the copper powder, copper powder having an average particle diameter of 1.2 μm was used. The particle size was measured by a wet method. The resin solution was prepared by dissolving phenoxy resin in triglyme. The phenoxy resin was adjusted to 30% by weight. The conductive paste sample was prepared by mixing 13.8 g of copper powder, 9.4 cc of the resin solution, and 5 cc of triglyme. As the stirring container 100, a container made of polypropylene and having a capacity of 150 cm 3 was used. As the rotating unit 104, a planetary rotating device was used. The stirring container 100 was fixed to the revolution container 140, and the revolution container 140 was set to revolve at 340 rpm while rotating at 261 rpm.

  The effect of stirring was evaluated according to the JIS K5400 4.7.2 filament method for the degree of dispersion of copper powder. That is, a sample that was well stirred in the groove of the crush gauge was poured and squeezed using a scraper to form a sample layer having a continuous thickness in the groove. By observing the sample layer, the graduation of a portion where three or more continuous stripes appearing on the sample surface appeared side by side in one groove was read to obtain the degree of dispersion. The unit is expressed in μm. The degree of dispersion indicates that the smaller the numerical value, the better the copper powder is dispersed. The conductive paste sample before stirring was not dispersed, and the dispersity could not be measured with a crush gauge that could measure up to 100 μm.

In Example 1, the stirrer 108 was used, in which the outer diameter of the side surface 212 is 20 mm, the thickness between the facing surface 240 and the upper surface 250 is 10 mm, and the material is stainless steel. The experiment was performed according to the following procedure. The conductive paste sample prepared as described above and the stirring bar 108 were placed in the stirring container 100. The stirring vessel 100 was set on the rotating unit 104, and the rotating unit 104 was rotated at a predetermined speed. The dispersion degree was measured by changing the stirring time. Table 1 shows the experimental results of Example 1. In the table, the degree of dispersion is described as “tub”. As shown in Table 1, it can be seen that as the stirring time elapses, the “tub” becomes smaller and well dispersed.

  In Example 2, the stirrer 108 was used in which the outer diameter of the side surface 212 is 25 mm, the thickness between the facing surface 240 and the upper surface 250 is 10 mm, and the material is stainless steel. The other conditions were tested in the same manner as in Example 1. Table 1 shows the experimental results of Example 2. As shown in Table 1, it can be seen that as the stirring time elapses, the “tub” becomes smaller and well dispersed.

(Comparative Example 1)
Next, as Comparative Example 1, an experiment was conducted without a stirrer. The other conditions were tested in the same manner as in Example 1. Table 1 shows the experimental results of Comparative Example 1. As shown in Table 1, even when the stirring time elapsed, the value of “tsubu” hardly changed.

(Comparative Example 2)
Next, as Comparative Example 2, an experiment was performed using a zirconia ball having a diameter of 10 mm. A conductive paste sample and one zirconia ball were placed in the stirring vessel 100. The stirring time was 30 minutes. Other conditions were the same as in Example 1. Table 1 shows the experimental results of Comparative Example 2. As shown in Table 1, even after stirring for 30 minutes, the value of “tub” was almost the same as that of Comparative Example 1.

(Comparative Example 3)
Next, as Comparative Example 3, an experiment was performed using two zirconia balls having a diameter of 10 mm. A conductive paste sample and two zirconia balls were placed in the stirring vessel 100. Other conditions were the same as in Comparative Example 2. Table 1 shows the experimental results of Comparative Example 3. As shown in Table 1, even after stirring for 30 minutes, the value of “tub” was almost the same as that of Comparative Example 1.

(Comparative Example 4)
Next, as Comparative Example 3, an experiment was performed using three zirconia balls having a diameter of 10 mm. A conductive paste sample and three zirconia balls were placed in the stirring vessel 100. Other conditions were the same as in Comparative Example 2. Table 1 shows the experimental results of Comparative Example 4. As shown in Table 1, even after stirring for 30 minutes, the value of “tub” was almost the same as that of Comparative Example 1.

  FIG. 16 shows a graph representing the experimental results. In Comparative Example 1 to Comparative Example 4, the value of “tsubu” hardly changed even after stirring for 30 minutes. On the other hand, in Example 1 and Example 2, it can be seen that “tubing” rapidly decreases as the stirring time elapses. As described above, the agglomerates contained in the stirred product can be effectively dispersed by the stirring device, the stirring bar, and the stirring method of the present embodiment. In particular, even in the case of a resin solution containing an aggregate in which primary particles having a particle size of several microns to submicrons are aggregated, the aggregate can be finely dispersed. As a result, it is possible to obtain a resin solution, a conductive paste, or the like that can suppress the occurrence of spots on the coated surface or the occurrence of streaky coating unevenness.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

Sectional drawing which cut | disconnected the stirring apparatus 10 of this embodiment by the plane perpendicular | vertical to a horizontal direction is shown. The outline of the rotational motion of the stirring container 100, the stirring bar 108, and the revolution container 140 is represented. An example of the side view showing the stirring bar 108 of this embodiment is shown. An example of the bottom view showing the stirring bar 108 of this embodiment is shown. Fig. 5 shows a stir bar 508 of another embodiment. The example according to the cross-sectional shape of a groove | channel is represented. The example according to the cross-sectional shape of a groove | channel is represented. The bottom view of the stirring bar 508 showing another example about the planar shape of a groove | channel is shown. The bottom view of the stirring bar 508 showing another example about the planar shape of a groove | channel is shown. The bottom view of the stirring bar 508 showing another example about the planar shape of a groove | channel is shown. The bottom view of the stirring bar 508 showing another example about the planar shape of a groove | channel is shown. Sectional drawing of the stirring element 1208 of another embodiment is shown. An example of the bottom view showing the stirring bar 1208 of this embodiment is shown. An example of the side view showing the stirring bar 1408 of this embodiment is shown. An example of the bottom view showing the stirring bar 1408 of this embodiment is shown. The graph showing an experimental result is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stirring apparatus 20 Stirring thing 22 Primary particle 24 Aggregate 100 Stirring container 104 Rotating part 108 Stirrer 110 Lid part 112 Perimeter wall part 114 Bottom plate part 116 Caster 118 Inner surface 122 Outer wall surface 124 Inner wall surface 132 Outer bottom surface 134 Inner bottom surface 140 Revolution container 142 Cylinder wall portion 144 Cylinder bottom portion 146 Shaft portion 150 Crank 152 Bearing 154 Shaft 156 Motor 158 Balance weight 160 Support portion 162 Leg portion 200 Grinding portion 202 Calling portion 210 Outer peripheral surface 212 Side surface 214 Outer peripheral inclined portion 222 Taper portion 224 R portion 226 Taper Part 228 R part 240 opposing surface 250 upper surface 508 stirrer 510 outer peripheral surface 512 side surface 524 R part 528 R part 530 bottom part 540 opposing surface 542 groove 544 groove wall part 546 groove inclined part 548 groove inclined part 642 groove 644 groove wall part 646 groove Slope 648 groove inclined part 742 groove 746 groove inclined part 748 groove inclined part 842 groove 942 groove 1042 groove 1142 groove 1208 stirrer 1240 opposing surface 1250 upper surface 1260 center hole 1262 center hole inclined part 1264 center hole inclined part 1266 inner peripheral surface 1408 stirrer 1416 Groove 1442 Groove

Claims (12)

A stirring vessel into which the stirring material is placed;
A rotating unit for rotating the stirring vessel;
A stirrer that grinds agglomerates contained in the agitated material, and a call-in portion that attracts the agitated material into the grinded part, and is placed in the agitating vessel together with the agitated material, and a stirring bar having a circular outer peripheral surface ,
A stirrer comprising: The stirrer has a substantially cylindrical outer shape,
The ground portion has a facing surface facing the inner bottom surface of the stirring vessel,
The calling portion has an inclined portion that forms an acute angle with the inner bottom surface of the stirring vessel, and connects the facing surface and the side surface of the stirring bar.
The stirrer according to claim 1. The stirrer has a donut-shaped outer shape with a central hole in the center,
The ground portion has a facing surface facing the inner bottom surface of the stirring vessel,
The calling portion has the central hole,
The stirrer according to claim 1. The calling portion further includes a groove formed in a bottom portion of the stirring bar.
The stirrer according to claim 2 or claim 3. The groove is a portion connected to the facing surface of the stirrer and has an inclined portion that forms an acute angle with the inner bottom surface of the stirring vessel.
The stirring device according to claim 4. The groove has a spiral shape concentric with the stirring bar,
The stirrer according to claim 4 or 5.   7. The rotating part according to claim 2, wherein the rotating part gives the stirrer an action of a pressing force by which the bottom of the stirrer is pressed against the inner bottom surface of the stirring container by the rotation of the stirring container. The stirring device according to one item. A crushed portion for grinding agglomerates contained in the agitated material with the inner surface of the agitated container;
A call-in part for drawing the agitated material into the grinding part;
A circular outer peripheral surface;
A stir bar provided with.   The stirrer according to claim 8, wherein the outer shape is formed vertically symmetrical. A stirrer having a substantially cylindrical outer shape, having a facing surface facing the inner bottom surface of the stirring vessel, a side surface, and an inclined portion that forms an acute angle with the inner bottom surface and connects the facing surface and the side surface is prepared. And the stage of
Placing the agitated material and the stirring bar in the stirring vessel;
Rotating the stirring vessel with a rotating part,
In the step of rotating the agitation container, the agitation material is drawn between the inner bottom surface and the inclined portion, and the aggregates contained in the agitation material are crushed by sliding between the inner bottom surface and the facing surface. , Stirring method. A stirrer having a donut-shaped outer shape, the stirrer having a center hole in the center of the donut shape and a facing surface facing the inner bottom surface of the stirring container;
Placing the agitated material and the stirring bar in the stirring vessel;
Rotating the stirring vessel with a rotating part,
In the step of rotating the agitation container, the agitation is drawn into the central hole, and the agglomerates contained in the agitation are ground by sliding between the inner bottom surface and the opposing surface. In the step of rotating the stirring vessel, a pressing force is applied to the stirring bar to press the opposed surface of the stirring bar against the inner bottom surface of the stirring vessel.
The stirring method according to claim 10 or claim 11.

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