JP4893142B2 - Stirring apparatus and method for producing high-viscosity synthetic resin - Google Patents

Description

  The present invention relates to a stirring device for stirring an object to be stirred such as a resin and a method for producing a high viscosity synthetic resin.

  Conventionally, for example, when synthesizing while stirring and mixing a resin and a solvent (stirring object), a stirring tank that contains the stirring object, a rotary shaft that is rotatably supported in the stirring tank, and a rotation in the stirring tank 2. Description of the Related Art Agitator apparatuses that are fixed to a rotating shaft and are equipped with a plurality of agitating blades that agitate an object to be agitated are often used. For example, as shown in FIGS. 16 to 18, this type of stirring device A includes a first upper blade 3 that is inclined with respect to the rotary shaft 2 and extends radially and upward as a stirring blade 1, The second upper wing 4 is disposed below the upper wing 3, extends in the radial direction and inclined downward with respect to the rotation shaft 2, and is disposed close to the second upper wing 4. There is a lower blade 6 extending downward from the rotary shaft 2 to the vicinity of the bottom 5a and extending in the radial direction, and a plurality of these stirring blades 1 are arranged in a multi-stage shape in the direction of the axis O1 of the rotary shaft 2 (for example, Patent Document 1). Further, in this stirring device A, the first and second upper blades 3 and 4 have portions extending with substantially the same radius as the lower blade 6, and a predetermined interval in the direction of the axis O1 of the rotary shaft 2 The lower side 3a of the first upper wing 3 and the upper side 4a of the second upper wing 4 are arranged so as to overlap each other in the direction of the axis O1.

In the stirring device A including the plurality of stirring blades 1 having such a configuration, the first upper blade 3 moves the object to be stirred H in the stirring tank 5 downward by rotating the rotating shaft O1 in the rotation direction T. The second upper wing 4 is moved, and the agitated object H is moved to the bottom 5 a of the agitation tank 5 by the suction force generated at the overlapping portion with the first upper wing 3. That is, as shown in FIG. 16, the first upper blade 3 and the second upper blade 4 form a downward flow S1 that moves the upper stirring object H downward. And the to-be-stirred object H moved downward by this downward flow S1 is directed toward the inner wall surface 5b along the bottom 5a of the stirring tank 5 (toward the radially outer side) by the side flow S2 formed by the lower blade 6. And move upward by the formation of the upward flow S3 along the inner wall surface 5b. Thereby, the to-be-stirred object H moves from the upper part to the lower part by the downward flow S1 from the upper part to the lower part by the downward flow S1 and the inner wall surface 5b from the lower part to the upper part by the upward flow S3. A moving circulation flow S is formed, and the formation of the large circulation flow S suitably stirs and mixes the material to be stirred H.
Japanese Patent Laid-Open No. 9-75699

  However, the stirring apparatus A includes a vertical stirring tank 5 that is large in diameter and configured to simultaneously stir and mix a large amount of the object to be stirred H as shown in FIGS. 16 and 17. In this case, as shown in the flow analysis results of the agitated object H in FIGS. 16 and 19, the agitating blade 1 is not arranged above the agitating tank 5 (above the agitated object H). The upward flow S3 is formed from the vicinity of the center in the height direction in the stirring tank 5 to the lower side, that is, the circulating flow S is not formed above the stirring target H (above the stirring tank 5), and the upper stirring target The pulling of the thing H below becomes small, and even when it stirs for a long time, the problem that it cannot mix uniformly will arise. In FIG. 19 showing the flow analysis result of the stirring object H, only the strong downward flow S1 and the upward flow S3 are shown by arrows.

  In particular, when producing a high-viscosity synthetic resin, that is, a low-viscosity resin raw material (stuff to be stirred) is accommodated in a stirring tank and reacted with stirring for several hours, for example, with a high viscosity of about 120,000 mPa · s. In the case of producing a synthetic resin, a reaction terminator is added to the stirring tank when the desired viscosity is reached, and a high viscosity synthetic resin (stirred object) and a reaction terminator (stirred object) are added. The reaction of the synthetic resin is stopped by stirring and mixing. At this time, when the object to be stirred cannot be uniformly stirred and mixed at an early stage as in the above stirring apparatus A, the reaction stopper is sufficiently mixed. There is a problem that the reaction is continued at a portion where there is not, the synthetic resin of this portion becomes higher in viscosity than necessary, and the quality of the produced synthetic resin varies in the stirring tank.

  On the other hand, for example, as shown in FIGS. 20 to 22, the stirring blade 7 (1) having the same shape and the same size as the first upper blade 3 is arranged in parallel above the rotating shaft 2 at a predetermined interval, That is, the same stirring blade 7 as the first upper blade 3 is added in a multistage manner, and the added stirring blade 7 is arranged at substantially the same position in the rotation direction T of the rotary shaft 2 so that the upper stirring target H Since the first upper blade 3 and the additional stirring blade 7 overlap vertically in the direction of the axis O1, the flow analysis result of the agitated object H in FIG. 20 and FIG. As shown by arrows only for the downward flow S1 and the upward flow S3, the downward flow S1 formed by the stirring blades 3 and 7 is divided in the vertical direction in the direction of the axis O1, and above the stirring target H. A large circulating flow S that reaches the lower side cannot be formed. That is, since the first upper blade 3 and the added stirring blade 7 are vertically overlapped with each other in the direction of the axis O1, negative rotation generated on the back surfaces 3b and 7a on the rear side in the rotational direction T of the stirring blades 3 and 7 during rotation. As shown in FIG. 22, the pressure region F is not continuously connected vertically, and the downward flow S <b> 1 formed from the upper side to the lower side is divided for each of the stirring blades 3 and 7. For this reason, a large circulating flow S that moves the stirring object H above the stirring tank 5 to the bottom 5a cannot be formed in the entire area of the stirring tank 5, and it still takes much time to mix the stirring object H. Or a problem that uniform mixing cannot be performed.

  In view of the above circumstances, the present invention provides a stirring device and a method for producing a high-viscosity synthetic resin that can reliably form a large circulation flow in the entire stirring tank and stir and mix the material to be stirred quickly and uniformly. The purpose is to provide.

  In order to achieve the above object, the present invention provides the following means.

The stirrer of the present invention is arranged in a multistage manner in a stirrer tank that accommodates an object to be stirred, a rotating shaft that is inserted into the stirrer tank and supported so as to be rotatable about an axis, and vertically in the axial direction. And a plurality of stirring blades fixed to the rotating shaft, wherein the plurality of stirring blades are provided on the lower end side of the rotating shaft and extend radially outward from the axial center of the rotating shaft. It is divided into a lower wing, an upper and lower two-stage middle wing provided above the lower wing, and at least one or more upper wing provided above the middle wing, constituting the middle wing and the upper wing The stirrer blades are inclined with respect to the rotation axis, and the upper and lower stirrer blades of the middle blade are each formed in a substantially quarter-elliptical shape and have a short diameter of each other in plan view. There is substantially co-located, stirring blade constituting the upper wing substantially quadrangular Formed in an elliptical shape, a portion corresponding to the minor axis of the substantially quarter elliptical shape in plan view with respect to the stirring blade of the lower vertically adjacent the axial direction are disposed in the rotation direction front side of the rotary shaft, and The lower end side is arranged so as to overlap the upper end side of the lower stirring blade in a plan view in the axial direction, and a downward flow is formed in the vicinity of the rotating shaft to move the object to be stirred downward from above. A side flow for moving the object to be stirred, which has moved to the bottom side of the stirring tank, toward the inner wall surface of the stirring tank is formed by the lower blades, and the upper side from the lower side to the upper side along the inner wall surface of the stirring tank. An upward flow for moving the object to be stirred is formed, and a circulating flow for circulating the object to be stirred throughout the stirring tank is formed.

The method for producing a high-viscosity synthetic resin of the present invention is a method for producing a high-viscosity synthetic resin by synthesizing a resin raw material while stirring it with a stirring device, wherein the stirring device contains the resin raw material. And a rotating shaft that is supported so as to be rotatable about an axis while being inserted into the stirring tank, and a plurality of stirring blades that are arranged in multiple stages in the upper and lower directions in the axial direction and are fixed to the rotating shaft. In addition, the plurality of stirring blades are provided on the lower end side of the rotary shaft and extend radially outward from the axial center of the rotary shaft, and two upper and lower stages provided above the lower blade. It is divided into a middle stage blade and at least one or more upper stage blades provided above the middle stage blade, and the upper and lower two stage stirring blades of the middle stage blade are each formed in a substantially quarter-elliptical shape, and in plan view The minor axis of each other is arranged at substantially the same position, and the upper blade is The stirring blade formed is formed in a substantially quarter-elliptical shape, and a portion corresponding to the minor axis of the substantially quarter-elliptical shape in a plan view with respect to the lower stirring blade adjacent vertically above and below in the axial direction is the rotation of the rotating shaft. Arranged at the front side in the direction and arranged so that the lower end side overlaps with the upper end side of the lower stirring blade in a plan view in the axial direction, and when rotating the rotary shaft, the middle blade and the upper blade are By forming a negative pressure region continuous from the upper side to the lower side of the stirring tank on the back side of each of the plurality of stirring blades constituting the rotating shaft, i.e., on the rear side in the rotation direction of the rotating shaft and facing upward, A side that forms a downward flow that moves the resin raw material from above to below in the vicinity of the rotation shaft, and that moves the resin raw material that has moved to the bottom side of the stirring tank toward the inner wall surface of the stirring tank by the downward flow A flow is formed by the lower wing Stirring while forming an upward flow for moving the resin raw material from below to above along the inner wall surface of the stirring tank, and forming a circulating flow for circulating the resin raw material throughout the stirring tank And

  In this stirring device and the method for producing a high viscosity synthetic resin, the stirring blades constituting the middle blade and the upper blade are provided to be inclined with respect to the rotation axis, respectively, and the stirring blade of the upper blade is the lower stirring blade. Are arranged so as to be partly overlapped with the lower agitating blade, so that the back surfaces of the middle blade and the upper blade are centered on the rotation axis. It can arrange | position so that it may connect in a substantially spiral shape. Thus, when the object to be stirred (resin raw material, synthetic resin) is stirred by rotating the rotating shaft, the negative pressure region generated on the back surface of each stirring blade is continuously spiraled from the top to the bottom. Can be formed. Therefore, it is possible to form a strong downward flow that continuously moves the object to be stirred in the vicinity of the rotating shaft from the upper side to the lower side by this continuous negative pressure region, and to form a large circulating flow in the entire region of the stirring tank. Can do.

  According to the stirring device and the method for producing a high-viscosity synthetic resin of the present invention, it is possible to form a continuous circulation flow that does not divide the object to be stirred in the stirring tank and to stir, so that Even in the case of stirring and mixing the stirring product, the stirring and mixing can be performed early and uniformly. Therefore, even in the case of producing a high-viscosity synthetic resin, the resin raw material having increased viscosity and the reaction terminator can be stirred and mixed quickly and uniformly. It is possible to prevent the reaction of the resin raw material from continuing and increase the viscosity more than necessary, and it is possible to eliminate the variation in the viscosity of the synthetic resin in the stirring tank and to produce a high-quality synthetic resin.

  The stirring device according to the embodiment of the present invention includes a stirring blade of the upper blade disposed at the uppermost position in the axial direction of the rotating shaft, a stirring blade constituting the middle blade, and another stirring blade constituting the upper blade. By forming the object to be smaller than that, the side flow that is pushed by the surface of the uppermost stirring blade of the upper stage blade and acts on the upper object to be stirred can be reduced when the object to be stirred is stirred. As a result, the downward flow that draws the upper stirring object downward is not weakened by the side flow caused by the uppermost stirring blade, and the upper stirring object is formed by forming a downward flow with a strong pulling force. It can be moved downward, and it becomes possible to stir and mix the object to be stirred more quickly and uniformly.

  Further, the stirring blades constituting the middle blade and the upper blade are each formed in a substantially quarter-elliptical shape, and the arc side is disposed radially outside the rotation shaft, and the lower blade of the middle blade The agitating blade of the middle stage blade is provided with a tip connecting the long side and the arc arranged below the rear side in the rotational direction, and is disposed above the lower agitating blade of the middle stage blade. The stirring blades of the upper blades are provided with the tips arranged above the front side in the rotational direction. Thereby, it is possible to more surely prevent a side flow from being generated due to agitation in the vicinity of the tip of the uppermost upper blade and the tip of the lowermost middle blade, that is, at the start and end sides of the downward flow. Therefore, it is possible to reliably form a strong downward flow and to stir and mix the object to be stirred quickly and uniformly.

  Further, each of the stirring blades constituting the middle blade and the upper blade is provided with a blade main body portion for stirring the object to be stirred and an extending portion extending across the blade main body portion, and is substantially T-shaped. When the extending portion is formed and fixed to the rotating shaft, a gap is formed before and after the extending portion in the rotation direction. It can be moved from the upper side to the lower side through the gap, and the object to be stirred in the vicinity of the rotating shaft can be prevented from rotating with the stirring blades of the middle blade and the upper blade. Thereby, a big circulation flow can be formed reliably.

  Further, when the stirring blades constituting the middle blade and the upper blade are respectively formed in a substantially crescent shape and the convex arc side is arranged radially outward, the stirring of the middle blade and the upper blade is performed. The wings can be arranged so that the respective back surfaces are surely connected in a spiral shape, and a negative pressure region continuous from above to below can be surely formed. This makes it possible to reliably form a strong downward flow that continuously moves the object to be stirred from above to below.

  Hereinafter, with reference to FIG. 1 to FIG. 11, a stirring device and a method for producing a high viscosity synthetic resin according to an embodiment of the present invention will be described. In this example, for example, a low-viscosity resin raw material (stirred object) of about 10 mPa · s is accommodated in a stirring tank, reacted while stirring for several hours to increase the viscosity, and reacted at a stage when the desired viscosity is reached. The present invention relates to a method for producing a high-viscosity synthetic resin in which a reaction of a synthetic resin (stirred object) is stopped by stirring and mixing while adding a stopper (stirred object).

As shown in FIG. 1, the stirring device C of the present embodiment has a bottomed cylindrical vertical stirring tank 5 capable of accommodating a synthetic resin of about 12 m ³ and a vertically suspended state in the center of the stirring tank 5. And a plurality of stirring blades 1 fixed to the rotating shaft 2 so as to be rotatable in the stirring tank 5 in a plurality of upper and lower stages. Yes.

  As shown in FIGS. 1 to 4, the plurality of stirring blades 1 includes a lower blade 10 made up of one stirring blade 6 provided on the lower end side of the rotating shaft 2 and two upper and lower blades provided above the lower blade 10. Are divided into a middle blade 11 composed of the above-mentioned stirring blades 11 a and 11 b and an upper blade 12 composed of two upper and lower stirring blades 12 a and 12 b provided above the middle blade 11. In the present embodiment, the agitating blades 11c, 11d, 11b, 12d, 12b, 12b, 12b, and 12b are symmetrically positioned around the axis O1 of the rotary shaft 2, respectively. 12c and 12d are provided, and the middle blade 11 and the upper blade 12 are constituted by these stirring blades 11c, 11d, 12c and 12d.

  One stirring blade 6 of the lower blade 10 is a substantially flat paddle blade extending so that both ends thereof are arranged radially outward with the axis O1 of the rotating shaft 2 as a center, and a pair of blades facing in opposite directions to each other. The surface 6a is disposed so as to be parallel to the axis O1. Further, the paddle blade 6 is provided so as to extend downward from the lower end of the rotating shaft 2, and the extended lower end is close to the bottom 5 a of the agitation tank 5 and has an arc shape along the shape of the bottom 5 a. Is formed. Further, at both ends in the width direction of the paddle blade 6 (both ends in the radial direction orthogonal to the axis O1), bent portions 6b that are bent at an angle of about 45 ° are provided on the rear side in the rotation direction T of the rotary shaft 2. .

  The upper and lower two-stage stirring blades 11a and 11b (11c and 11d) constituting the middle blade 11 are each formed in the same shape and size of a quarter ellipse (a shape in which the ellipse is divided into four substantially along the major axis and minor axis). And fixed to the rotary shaft 2 via the boss 13. In addition, the stirring blades 11a and 11b (11c and 11d) have a short side (short diameter) side (rear end 14 side) of the long side (major diameter) fixed to the rotary shaft 2 and a circular arc side in the radial direction. It is fixed in a state of being placed on the outside. Further, at this time, the stirring blades 11a and 11b (11c and 11d) are such that the front surface 15 faces downward on the front side in the rotational direction T of the rotary shaft 2 and the back surface 16 faces upward on the rear side in the rotational direction T. Are inclined with respect to the rotary shaft 2. The upper stirring blade 11b (11d) is provided with the long side inclined upward so that the tip (upper end) 17 connecting the long side and the arc is arranged upward. On the other hand, the lower stirring blade 11a (11c) is provided with the long side inclined downward so that the tip (lower end) 17 connecting the long side and the arc is arranged downward. Further, the upper stirring blade 11b (11d) and the lower stirring blade 11a (11c) are fixed at the same position in the rotation direction T of the rotary shaft 2, and are spaced apart from each other in the vertical direction (in the direction of the axis O1 of the rotary shaft 2). Are arranged parallel to each other. Thereby, the upper and lower two-stage stirring blades 11a, 11b (11c, 11d) constituting the middle blade 11 are overlapped with each other at the rear end 14 side (the respective upper end side and lower end side) in plan view in the direction of the axis O1. Are arranged so as to exhibit a substantially elliptical shape.

  In this embodiment, the upper and lower two-stage stirring blades 12a and 12b (12c and 12d) constituting the upper blade 12 are in the shape of a quarter ellipse having the same shape and size as the stirring blades 11a and 11b (11c and 11d) of the middle blade 11. Is formed. These agitating blades 12a, 12b (12c, 12d) are fixed to the rotary shaft 2 via the bosses 13 in the same manner as the middle blade 11, and each has a long side on the short side (rear end 14 side). Is fixed to the rotating shaft 2 and is fixed in a state where the arc side is arranged radially outward. Furthermore, it is inclined with respect to the rotating shaft 2 so that the front surface 15 faces the lower side on the front side in the rotational direction T of the rotating shaft 2 and the rear surface 16 faces the upper side on the rear side in the rotating direction T. On the other hand, all the stirring blades 12a, 12b (12c, 12d) of the upper blade 12 are provided with the long sides inclined upward so that the tip (upper end) 17 connecting the long sides and the arc is arranged upward. ing.

  Further, the lower stirring blades 12a (12c) of the upper and lower two-stage stirring blades 12a and 12b (12c, 12d) of the upper blade 12 are respectively adjacent to the upper and lower middle blades 11 as shown in FIGS. The upper agitating blade (lower agitating blade) 11b (11d) is shifted from the front side in the rotational direction T of the rotating shaft 2 by an angle of 45 °. Further, the upper stirring blade 12b (12d) of the upper blade 12 is shifted from the lower stirring blade (lower stirring blade) 12a (12c) by an angle of 45 ° to the front side in the rotational direction T of the rotary shaft 2. Has been placed. At this time, the upper stirring blade (lower stirring blade) 11b (11d) of the middle blade 11 and the lower stirring blade 12a (12c) of the upper blade 12 and the lower stirring blade (lower stirring blade of the upper blade 12). Blade) 12a (12c) and upper stirring blade 12b (12d) of upper blade 12 are arranged such that the rear end (lower end) 14 side overlaps the tip (upper end) 17 side of the lower stirring blade in plan view in the direction of axis O1. Has been placed. As a result, the upper and lower stirring blades 12a and 12b (12c and 12d) of the upper blade 12 and the lower stirring blade 12a (12c) of the upper blade 12 and the upper stirring blade 11b (11d) are positioned at 45 °. As shown in FIG. 4, the two upper and lower stirring blades 11a and 11b (11c and 11d) of the middle blade 11 arranged in a phase difference form the stirring blades 11a, 11b, 12a and 12b (11c, 11d, 12c and 12d). ) Is connected so as to be twisted about the axis O1 of the rotary shaft 2 in a substantially spiral shape.

  Here, in this embodiment, the lower stirring blade 12a (12c) of the upper blade 12 is compared with the upper stirring blade 11b (11d) of the middle blade 11, and the upper stirring blade 12b (12d) of the upper blade 12 is. The upper blade 12 is arranged so as to be shifted from the lower stirring blade 12a (12c) of the upper blade 12 by an angle of 45 ° to the front side in the rotation direction T of the rotary shaft 2, but the upper and lower stirring blades (11b and 11b) 12a, 12a and 12b) (11d and 12c, 12c and 12d) are overlapped with each other, and the back surface 16 of each stirring blade 11a, 11b, 12a, 12b (11c, 11d, 12c, 12d) is not substantially spiral. If they can be connected in a shape, they can be shifted by an angle of less than 90 °, preferably shifted by an angle in the range of 30 ° to 60 °.

  Next, a method for producing a high-viscosity synthetic resin (stirred object) H using the stirrer C of the present embodiment configured as described above will be described, and the stirrer C and the high-viscosity synthetic resin H of the present embodiment will be described. The operation and effect of the manufacturing method will be described.

In this embodiment, for example, 10 m ^{3 of} an acrylic resin, alkyd resin, urethane resin, polyester, or other resin raw material (stirred object) H is charged. This resin raw material H has a low viscosity of, for example, about 10 mPa · s, and when it is reacted for several hours with stirring, it increases in molecular weight and gradually increases in viscosity. Then, in order to adjust the viscosity of the resin raw material H or to adjust the nonvolatile content, a predetermined amount of a solvent (stirred object) such as toluene, xylene, or methanol having a low viscosity of about 1 mPa · s is further added. For example, high-viscosity synthetic resin H of about 120,000 mPa · s is produced by stirring and mixing. Next, in this way, to the synthetic resin H adjusted to a predetermined viscosity, for example, 2 m ³ of a reaction terminator (stirred object) of about 4 mPa · s is added and stirred and mixed to stop the reaction of the synthetic resin H. A synthetic resin H having a predetermined viscosity is produced at 12 m ³ .

  Here, when the synthetic resin H is produced as described above, when the increase in the viscosity of the resin raw material H proceeds slowly, stirring and mixing is performed relatively uniformly, but the resin raw material in which the viscosity rapidly increases. There is also a lot of H. Also, for example, if the blending accuracy of the resin raw material H is out of order or the order of preparation is wrong, an excessive amount of heat is generated in the resin raw material H, and the stirring tank is poor due to poor stirring and mixing. In some cases, the synthetic resin (resin raw material) H in FIG. For this reason, it is important to quickly stir and mix the added reaction terminator to lose density unevenness and the like in order to keep the synthetic resin H in the stirring tank 5 uniform and to stabilize its quality.

  On the other hand, in the stirring device C of the present embodiment, when a solvent or a reaction terminator is added to the resin raw material H having increased viscosity, and the rotary shaft 2 is rotated so as to stir and mix them, the middle stage Surfaces 15 of the blades 11 and the upper blades 12 facing the front side and the lower side in the rotational direction T of the stirring blades 11a, 11b, 12a and 12b (11c, 11d, 12c and 12d) are to be stirred (resin raw material, solvent , Reaction terminator) H is pressed and moved downward. Further, the stirring blades 11a, 11b, 12a, 12b (11c, 11d, 12c, 12d) of the middle blade 11 and the upper blade 12 are arranged so as to connect the respective back surfaces 16 in a spiral shape. As shown in FIG. 20 to FIG. 23, the negative pressure region F is divided in the conventional stirring device B, whereas in the stirring device C of the present embodiment, as shown in FIG. The negative pressure region F generated on the back surface 16 of the blades (11a, 11b, 12a, 12b (11c, 11d, 12c, 12d) is from the liquid surface side of the stirring object H to the bottom 5a side of the stirring tank 5 As a result of the formation of the negative pressure region F that is substantially spirally continuous in this manner, the flow analysis result (strong downflow S1) of the agitated object H is formed. And only upward flow S3 is indicated by an arrow As shown in FIG. 5, a strong downward flow S <b> 1 continuous from the upper side to the lower side is formed in the vicinity of the rotating shaft 2 in the stirring tank 5, and the stirring target H in this part is strongly downward. In addition, the agitated object H that has sequentially moved from the upper side to the lower side in this way is drawn into the negative pressure portion generated in the vicinity of the surface 6a facing the rear side in the rotational direction T of the paddle blade 6, and A side flow S2 that flows toward the inner wall surface 5b along the bottom 5a moves sideways, and the agitated object H that has reached the inner wall surface 5b due to the formation of the side flow S2 is along the inner wall surface 5b. It moves upward by the strong upward flow S3 flowing upward, and as a result, compared with the stirring device B of the comparative example shown in FIGS. , Stirring object H from top to bottom, from bottom to side, from side to top A large circulating flow S to be moved to, that is, an undivided circulating flow S is formed. By such a large circulating flow S, a highly viscous resin raw material H, a low-viscosity solvent and a reaction terminator are quickly and Mix uniformly.

  Further, in this embodiment, the upper stirring blade 12b (12d) of the upper blade 12 positioned at the uppermost position has the narrow tip 17 side upward, and the lower stirring blade 11a (11c) of the middle blade 11 is disposed. Since the tip 17 side having a small width is directed downward, a large side flow due to the rotation of the rotary shaft 2 does not act on the start end side and the end end side of the downward flow S1. For this reason, the pulling-in force of the upper side (liquid level side) of the to-be-stirred object H becomes large, and the to-be-stirred object H surely flows to the paddle blade 6 side with a large downward flow S1. As a result, the side flow S2 generated by the paddle blade 6 and, as a result, the upward flow S3 flowing upward along the inner wall surface 5b of the agitation tank 5 are strongly formed, and a strong circulation flow S is formed. That is, when the rear end 14 side having a large quarter-elliptical shape is arranged at the start end side or the end end side of the downward flow S1, for example, as shown in FIG. 7, the lower stirring blade 11a (11c) of the middle blade 11 is placed at the tip. In the case where the rear end 14 and the rear end 14 are reversed, it is possible to form a substantially spiral negative pressure region F that continues downward from above, but on the other hand, near the end of the downward flow S1 due to the rotation of the rotating shaft 2 ( A side flow S4 is formed above the side flow by the paddle blades 6). In this case, since the downward flow S1 and the upward flow S3 are divided or weakened by the side flow S4, a suitable circulation flow S as in this embodiment is not formed, and the agitated object H The efficiency of stirring and mixing is reduced.

  In this connection, in this embodiment, the stirring blades 11a, 11b, 12a, 12b (11c, 11d, 12c, 12d) constituting the middle blade 11 and the upper blade 12 are all formed in the same shape and size. However, as shown in FIG. 8 and FIG. 9, the upper blade 12 b (12 d) of the upper blade 12, that is, the stirring blade 12 b (12 d) for pulling down the upper stirring object H is used as the middle blade. 11 stirrer blades 11a, 11b (11c, 11d) and lower stirrer blades 12a (12c) of the upper blade 12 may be formed smaller. In such a configuration, the start side of the downward flow S1 is further increased. It is possible to suppress the formation of a lateral flow, and the upper stirring object H can be moved downward with a strong pulling force. Similarly, as shown in FIGS. 8 and 9, the fin 20 extends so as to overlap the rear end 14 of the upper stirring blade 11 b (11 d) of the upper blade 11 and the rear end 14 of the lower stirring blade 11 a (11 c). The agitated object H moves from the positive pressure side surface 15 side to the negative pressure side rear surface 16 side through the gap in the axis O1 direction of the upper and lower stirring blades 11a, 11b (11c, 11d), and the middle stage It is ensured that the balance of the continuous negative pressure region F formed on the back surface 16 side of the upper and lower stirring blades 11a, 11b (11c, 11d) of the blade 11 is broken and the downward flow S1 is divided or weakened. Can be prevented.

  Further, in the present embodiment, the stirring blades 12a and 12b (12c and 12d) of the upper blade 12 are arranged 45 ° shifted from the lower stirring blade to the front side in the rotation direction T, so that the upper blade 12 is moved downward from above. A negative pressure region F continuous toward the bottom was formed, and a strong downward flow S1 was formed. On the other hand, as shown in FIG. 10, the stirring blades 12a and 12b (12c and 12d) of the upper blade 12 are arranged so as to be shifted at an angle of 45 ° to the rear side in the rotation direction T with respect to the lower stirring blade. In this case, the back surface 16 of each stirring blade overlaps in the direction of the axis O1 and is disposed substantially opposite to each other. Therefore, the negative pressure region loses continuity, and the flow analysis result of the stirring target H (strong downflow S1 and ascending) As shown in FIG. 11 showing only the flow S3 (shown by an arrow), the downward flow S1 and the circulation flow S are divided.

  Therefore, according to the stirring device C and the method for producing the high-viscosity synthetic resin H of this embodiment, the stirring target H in the stirring tank 5 can be stirred by forming a continuous circulation flow S that is not divided. Even in the case of stirring and mixing the high-viscosity object H, it becomes possible to stir and mix quickly and uniformly. As a result, even in the case of producing a high-viscosity synthetic resin H, the synthetic resin H having increased viscosity and the reaction terminator can be stirred and mixed quickly and uniformly. Thus, it can prevent that the reaction of the resin of an unmixed part continues and it becomes higher viscosity than necessary, and can eliminate that dispersion | variation arises in the stirring tank 5. FIG. Therefore, it is possible to reliably manufacture a high-quality synthetic resin H.

  Further, the stirring blade 12b (12d) of the upper blade 12 positioned at the uppermost side has the tip 17 side having a small width directed upward, and the lower stirring blade 11a (11c) of the middle blade 11 has a tip 17 having a small width. By providing the side downward, it is possible to prevent a large side flow from acting on the start and end sides of the downflow S due to the rotation of the rotary shaft 2, and the strong downflow S1 and thus the circulation flow S can be prevented. It becomes possible to stir and mix the material to be stirred H at an early stage and uniformly.

  Furthermore, by forming the stirring blade 12b (12d) of the upper blade 12 positioned at the uppermost position smaller than the other stirring blades 11a, 11b, 12a (11c, 11d, 12c) of the middle blade 11 and the upper blade 12. Thus, it is possible to prevent the start end side of the downward flow S1 from being weakened by the side flow, and it is possible to more reliably form the strong downward flow S1 and thus the circulating flow S.

  In addition, this invention is not limited to said Example, In the range which does not deviate from the meaning, it can change suitably. For example, in the present embodiment, the stirring blades 11a, 11b, 12a, 12b (11c, 11d, 12c, 12d) constituting the middle blade 11 and the upper blade 12 are formed in a quarter-elliptical shape. For example, as shown in FIGS. 12 and 13, each stirring blade is provided with a blade main body portion 21 a that stirs the object to be stirred H and an extending portion 21 b that extends so as to intersect the blade main body portion 21 a. It may be formed in a shape, and one end of the extending portion 21b in the extending direction may be fixed to the rotating shaft 2. In this case, since the gap D is formed between the blade body 21a and the rotary shaft 2, that is, at a position around the rotation direction T of the rotary shaft 2 with the extending portion 21b interposed therebetween, the blade body The downward flow S1 of the agitated object H that flows through the negative pressure region F that is formed on the back surface 16 side of the portion 21a and continues downward from above can flow downward through this gap. Thereby, it is possible to prevent the high-viscosity stirring object H from rotating around the rotating shaft 2 with the stirring blades of the middle blade 11 and the upper blade 12 and to reliably form a large circulating flow S.

  Further, for example, as shown in FIGS. 14 and 15, the stirring blades 22 constituting the middle blade 11 and the upper blade 12 may be formed in a crescent shape, and in this case, the convex arc side is arranged radially outward. Then, by fixing the rotating shaft 2 to each other, the tip 17 side and the rear end 14 side of the stirring blades 22 adjacent to each other in the vertical direction are overlapped with each other, and the substantially spiral negative pressure region F that is surely continuous downward from above. Can be formed. Thereby, the powerful downward flow S1 which moves the to-be-stirred thing H continuously from the upper direction to the downward direction can be formed reliably.

  In this embodiment, the stirrer blades of the respective stages are arranged symmetrically about the axis O1 of the rotating shaft 2, so that a substantially helical negative pressure region extending by twisting from above to below around the axis O1 of the rotating shaft 2 is provided. Although two Fs are formed, the number of stirring blades in each stage may be increased to form three or more substantially spiral negative pressure regions F. Furthermore, in the present embodiment, the upper blade 12 is formed in two upper and lower stages, but the upper blade 12 is configured with the single blade 12a (12c) by removing the upper blade 12b (12d). Or, conversely, the upper blade 12 may be configured by adding stirring blades so as to have three or more stages.

It is a front view which shows the stirring apparatus by the Example of this invention. It is the X1-X1 arrow view figure of FIG. FIG. 2 is an X2-X2 arrow view of FIG. 1. It is a perspective view which shows the stirring blade of the stirring apparatus by the Example of this invention. It is a figure which shows the flow condition of a to-be-stirred object at the time of stirring to-be-stirred object using the stirring apparatus by the Example of this invention. It is a figure which shows the formation condition of the circulating flow at the time of stirring a to-be-stirred object using the stirring apparatus by the Example of this invention. It is a front view of the other stirring apparatus shown as a comparative example with respect to the stirring apparatus by the Example of this invention. It is a front view which shows the modification of the stirring apparatus by the Example of this invention. It is a X1-X1 line arrow directional view of FIG. It is a front view of the other stirring apparatus shown as a comparative example with respect to the stirring apparatus by the Example of this invention. It is a figure which shows the flow condition of the to-be-stirred object at the time of stirring to-be-stirred object using the stirring apparatus of FIG. It is a front view which shows the modification of the stirring apparatus by the Example of this invention. It is a X1-X1 line arrow directional view of FIG. It is a front view which shows the modification of the stirring apparatus by the Example of this invention. It is the X1-X1 line arrow directional view of FIG. It is a front view which shows the conventional stirring apparatus. It is a X1-X1 line arrow directional view of FIG. It is a perspective view which shows the stirring blade of the stirring apparatus of FIG. It is a figure which shows the flow condition of a to-be-stirred object at the time of stirring to-be-stirred object using the stirring apparatus of FIG. It is a front view which shows the modification of the conventional stirring apparatus of FIG. It is a X1-X1 line arrow directional view of FIG. It is a perspective view which shows the stirring blade of the stirring apparatus of FIG. It is a figure which shows the flow condition of a to-be-stirred object at the time of stirring to-be-stirred object using the stirring apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirring blade 2 Rotating shaft 3 1st upper blade 3a Lower side 3b Back surface 4 2nd upper blade 4a Upper side 5 Stirring tank 5a Bottom 5b Inner wall surface 6 Paddle blade (stirring blade)
6a Surface 6b Bent part 7 Stirring blade 7a Back surface 10 Lower blade 11 Middle blade 11a Lower stirring blade (middle blade)
11b Upper stirring blade (middle blade)
11c Lower stirring blade (middle blade)
11d Upper stirring blade (middle blade)
12 Upper blade 12a Lower blade (upper blade)
12b Upper stirring blade (upper blade)
12c Lower stirring blade (upper blade)
12d Upper stirring blade (upper blade)
13 Boss 14 Rear end 15 Front surface 16 Back surface 17 Front end 20 Fin 21a Blade body portion 21b Extension portion 22 Stirring blade A Conventional stirring device B Comparative example C Stirring device D Gap F Negative pressure region H Stirred object S Circulating flow S1 Lowering Flow S2 Side flow S3 Upflow S4 Side flow T Rotation direction O1 Axis of rotation axis

Claims (6)

An agitation tank that accommodates an object to be agitated, a rotation shaft that is inserted into the agitation tank and supported so as to be rotatable around an axis, and is arranged in a multistage manner in the vertical direction of the axis and fixed to the rotation axis. In a stirring device comprising a plurality of stirring blades,
The plurality of agitating blades are provided on the lower end side of the rotating shaft and extend radially outward from the axial center of the rotating shaft, and upper and lower two-stage middle blades provided above the lower blade. And at least one or more upper wings provided above the middle wing,
The stirring blades constituting the middle stage blade and the upper stage blade are respectively provided inclined with respect to the rotating shaft,
The upper and lower two-stage stirring blades of the middle blade are each formed in a substantially quarter-elliptical shape, and the minor blades are arranged at substantially the same position in plan view, and the stirring blades constituting the upper blade are substantially quarter-elliptical is formed in a shape, a portion corresponding to the minor axis of the substantially quarter elliptical shape in plan view with respect to the stirring blade of the lower vertically adjacent the axial direction are disposed in the rotation direction front side of the rotary shaft, and wherein It is arranged so that the lower end side overlaps with the upper end side of the lower stirring blade in a plan view in the axial direction, and a downward flow is formed in the vicinity of the rotating shaft to move the object to be stirred downward from above. A lateral flow is formed by the lower blades to move the object to be stirred, which has moved to the bottom side of the stirring tank, toward the inner wall surface of the stirring tank, and from above to below the inner wall surface of the stirring tank. Forming an upward flow for moving the agitated material; Stirring apparatus characterized by being formable to constitute a circulation flow to circulate across the agitation tank. The stirrer according to claim 1, wherein
The stirring blade of the upper blade arranged at the uppermost position in the axial direction of the rotating shaft is formed smaller than the stirring blade constituting the middle blade and the other stirring blades constituting the upper blade. A stirrer. The stirrer according to claim 1 or 2,
The stirring blades constituting the middle stage blade and the upper stage blade are each formed in a substantially quarter-elliptical shape, and are provided with the arc side disposed radially outward with respect to the rotation shaft,
The lower stage stirring blade of the middle blade is provided with a tip connecting a long side and an arc arranged below the rotation direction rear side, and the middle blade provided above the lower stirring blade of the middle blade. The stirring blade of the upper stage and the stirring blade of the upper stage blade are provided with the tip disposed above the front side in the rotational direction. The stirrer according to claim 1 or 2,
The agitating blades constituting the middle blade and the upper blade are each formed in a substantially T shape including a blade body part for stirring the object to be stirred and an extending part extending across the blade body part. The stirring device is characterized in that the extending portion is fixed to the rotating shaft. The stirrer according to claim 1 or 2,
An agitation device, wherein the agitation blades constituting the middle blade and the upper blade are each formed in a substantially crescent shape and are provided with a convex arc side disposed radially outward. In a method of producing a high viscosity synthetic resin by synthesizing resin raw materials while stirring with a stirring device,
The stirrer is disposed in a multistage manner in a stirrer tank that contains the resin raw material, a rotation shaft that is inserted into the stirrer tank and supported so as to be rotatable about an axis, and is vertically arranged in the axial direction. A plurality of stirring blades fixed to the rotating shaft, and the plurality of stirring blades are provided on the lower end side of the rotating shaft and extend downward in the radial direction around the axis of the rotating shaft; It is divided into upper and lower two-stage middle wings provided above the lower wings, and at least one upper wing provided above the middle wings,
The upper and lower two-stage stirring blades of the middle blade are each formed in a substantially quarter-elliptical shape, and the minor blades are arranged at substantially the same position in plan view, and the stirring blades constituting the upper blade are substantially quarter-elliptical A portion corresponding to a minor axis of the substantially quarter-elliptical shape in plan view with respect to a lower stirring blade adjacent to the upper and lower sides in the axial direction is disposed on the front side in the rotational direction of the rotary shaft, and Arranged so that the lower end side overlaps the upper end side of the lower stirring blade in plan view in the axial direction,
When the rotating shaft is rotated, the stirring tank is placed on the back side of each of the plurality of stirring blades constituting the middle blade and the upper blade, that is, on the rear side in the rotation direction of the rotating shaft and facing upward. By forming a negative pressure region continuous from the top to the bottom, a downward flow is formed in the vicinity of the rotating shaft to move the resin raw material from the top to the bottom, and the downward flow moves to the bottom side of the stirring tank A side flow for moving the resin raw material toward the inner wall surface of the stirring tank is formed by the lower blade, and an upward flow for moving the resin raw material from below to above along the inner wall surface of the stirring tank is formed. And it stirs, forming the circulating flow which circulates the said resin raw material in the whole region in the said stirring tank, The manufacturing method of the high viscosity synthetic resin characterized by the above-mentioned.

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