JP5729587B2 - High shear device and high shear method - Google Patents

Description

  The present invention disperses and mixes the internal structure of the polymer material at the nano level by high shearing the polymer material such as an incompatible polymer blend system, polymer / filler system, or polymer blend / filler system material. The present invention relates to a high shear device and a high shear method.

  Conventionally, polymer blend extrudates that have a dispersed phase of several tens of nanometers without adding extra additives such as compatibilizers in blend-based materials that are incompatible with each other (incompatible) at rest. High shear machines for manufacturing are known.

Patent Document 1 discloses a high shearing machine equipped with an internal feedback type high shearing screw. In this high shearing machine, the polymer blend material is rotated at a rotational speed of, for example, 500 to 3000 min ⁻¹ by the high shearing screw. A polymer blend extrudate excellent in heat resistance, mechanical properties, dimensional stability, etc. is produced by rotating at high speed and kneading for several minutes to make it nano-dispersed.

Specifically, FIG. 12 shows a schematic configuration of a high shear machine described in Patent Document 1. In the high shear machine 100, a high shear screw 102 inserted through the heating cylinder 101 is formed with a tapered outer peripheral surface, and the high shear screw 102 is rotated at a low speed, for example, at 120 to 240 min ^−1. Then, a solid pellet sample 104 (polymer blend resin) is pushed into the high shear screw 102 through a charging hole 101a through a charging hole 103 with a stick or the like and plasticized. After that, high shear is performed by rotating the high shear screw 102 at a higher speed from the low speed rotation during plasticization.

  In addition, the groove surface of the outer peripheral surface of the high shear screw 102 (the groove surface between adjacent screw blades 102b) is connected to the discharge port 105 from the rear end side (base end side) close to the input hole 101a of the pellet sample 104. A tapered surface 102a is formed so as to gradually increase in diameter toward the adjacent tip side. By providing such a tapered surface 102a, the solid pellet sample 104 supplied to the high shear screw 102 moves from the screw rear end side to the front end side and is compressed, and is transformed into a paste state in which it is plasticized and melted from the solid state. Become.

JP-A-2005-313608

  However, in the high shear machine 100 disclosed in Patent Document 1, as a function of the high shear screw 102, a function of plasticizing a solid polymer blend resin by low speed rotation and a high temperature of molten resin by high speed rotation are provided. It has two functions of shearing. In order to compress and plasticize and melt the solid resin, it is necessary to make the outer peripheral surface of the high shear screw 102 into a tapered surface 102a, that is, a compression shape. However, there is a problem that the provision of the tapered surface 102a makes it impossible to apply a constant shear stress to the resin, resulting in a decrease in high shear efficiency.

  In addition, in the method of continuously performing plasticization and high shear using the same high shear screw, it is difficult to set the shape, configuration, conditions, etc. suitable for both plasticization and high shear. When a transparent polymer blend material is extruded, the extrudate becomes cloudy or brownish, resulting in problems that impair the transparency, producing a stable and excellent extrudate. There was a problem that I could not.

  On the other hand, it is also conceivable that a solid polymer blend resin is heated and mixed in a separate heating cylinder, plasticized in advance, then supplied to a high shearing machine, and a high shearing screw is rotated at high speed for high shearing. . However, in this case, if the high shearing process is performed without cooling, the temperature of the molten resin rises rapidly, and the resin after the high shearing process is burnt, and it becomes difficult to disperse and mix. It will take time.

  In addition, when cooling is performed during high shear processing, if the amount of cooling becomes excessive, the resin in the vicinity of the cooling circuit in the heating cylinder is overcooled, and the resin does not disperse at the nano level or is also dispersed at the nano level. Takes a long time.

  And if the high shear processing time becomes long in this way, some of the high sheared resin will burn out or the average molecular weight will decrease, so it is necessary to perform high shear processing in a short time become.

  In addition, when high-shearing is performed by supplying a high-shearing screw to a high-shearing machine using a plasticizer that has been pre-heated and plasticized by a plasticizer, high shearing heat or frictional heat is generated due to the high resin viscosity when the high-shearing screw is started at high speed. Etc. occur, and the resin temperature rises rapidly. The resin viscosity is determined by the resin temperature and the shear rate. The higher the resin temperature, the lower the resin viscosity, and the higher the resin viscosity, the greater the shear force. For this reason, when the resin temperature rises rapidly, the resin viscosity is lowered, and it becomes impossible to give a high shearing force to the resin, and nano-level dispersion and mixing efficiency are lowered.

  From these facts, it is necessary to lower the temperature to a predetermined melting temperature and stabilize it at high speed so as not to cause supercooling locally at the time of high shearing. However, in the high shearing machine disclosed in Patent Document 1, The resin temperature cannot be lowered rapidly during shearing.

  In view of the above circumstances, the present invention is a high shear device that rotates at a high speed during high shear of a polymer material and performs temperature control in response to a rapid temperature change so that it can be dispersed and mixed at the nano level efficiently. And it aims at providing a high shear method.

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

The high shear device of the present invention is a high shear device for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress, and an internal feedback screw is fast in a material heating cylinder. A high shearing portion that is rotatably provided and applies high shear stress to the plasticized polymer material by rotating the internal feedback screw at a high speed, and the temperature of the polymer material in the material heating cylinder is lowered. Cooling means, a torque sensor for detecting the torque of a driving source for driving the internal feedback screw, a rotational speed sensor for detecting the rotational speed of the internal feedback screw, and detection by the torque sensor and the rotational speed sensor torque and in accordance with the rotational speed and a cooling temperature control means for controlling the temperature of the polymeric material by the cooling means, the upper limit threshold of the output of the driving source The _{P A,} the lower threshold _{P B,} the torque _{T P} detected by the torque sensor, the rotational speed as the _{N (P A> T P ×} N> P B) detected by said speed sensor, The opening degree D ′ of the cooling means is set by the following formula (1).
( _TP × N−P _B ) / (P _A −P _B ) = D ′ (1)

The high shear device of the present invention is a high shear device for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress, wherein the internal feedback screw is a material heating cylinder. A high-shear portion that is provided so as to be capable of high-speed rotation and applies high-shear stress to the polymer material that is plasticized by rotating the internal feedback screw at a high speed, and a polymer material in the material heating cylinder. Cooling means for lowering the temperature, a torque sensor for detecting the torque of a driving source for driving the internal feedback screw, a rotational speed sensor for detecting the rotational speed of the internal feedback screw, the torque sensor, and the rotational speed A cooling temperature control means for controlling the temperature of the polymer material by the cooling means according to the torque and the rotational speed detected by the sensor,
Furthermore, in the high shear device of the present invention, the maximum opening degree of the cooling means is D _A , the minimum opening degree is D _B , the maximum output of the drive source is C _A , and the minimum output is C _B (A> C _A , C _B > B), the upper threshold value A and the lower threshold value B of the output of the drive source are obtained from the relationship of the following formulas (2) and (3), and detected by the torque sensor The current output value obtained from the torque _TP and the rotational speed N detected by the rotational speed sensor is C _P (A> C _P > B), and the opening degree D ′ of the cooling means is set by the following equation (4). It is characterized by doing.
(C _A -B) / (A-B) = D _A (2)
(C _B -B) / (A−B) = D _B ... (3)
_{(C P -B) / (A} -B) = D '···· (4)

The high shear method of the present invention is a high shear method for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress, and is an internal feedback screw provided in a material heating cylinder The high-speed rotation of the plastic material causes high shearing of the plasticized polymer material, and detects the torque of the drive source of the internal feedback screw and the rotational speed of the internal feedback screw, and is obtained from the torque and the rotational speed. The temperature of the high shear material is controlled by adjusting the flow rate of the cooling medium supplied into the material heating cylinder according to the change in the output of the drive source, and the upper limit of the output of the drive source is set. Threshold value is P _A , Set the lower threshold to P _B The torque detected by the torque sensor is T _P , N (P _A > T _P × N> P _B ), The flow rate of the cooling medium is controlled by setting the opening D ′ of the cooling means for supplying the cooling medium according to the following equation (5).
(T _P × NP _B ) / (P _A -P _B ) = D '(5)

The high shear method of the present invention is a high shear method for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress, and is an internal feedback screw provided in a material heating cylinder The high-speed rotation of the plastic material causes high shearing of the plasticized polymer material, and detects the torque of the drive source of the internal feedback screw and the rotational speed of the internal feedback screw, and is obtained from the torque and the rotational speed. The temperature of the high-shearing polymer material is controlled by adjusting the flow rate of the cooling medium supplied into the material heating cylinder according to the change in the output of the driving source, and the maximum opening of the cooling means is set. D _A , The minimum opening is D _B , The maximum output of the drive source is C _A , The minimum output is C _B (A> C _A , C _B > B), an upper limit threshold value A and a lower limit threshold value B of the output of the drive source are obtained from the relationship of the following formulas (6) and (7), and the torque T detected by the torque sensor _P And the current output value obtained from the rotational speed N detected by the rotational speed sensor is C _P (A> C _P > B), the flow rate of the cooling medium is controlled by setting the opening degree D 'of the cooling means for supplying the cooling medium according to the following equation (8).
(C _A -B) / (AB) = D _A  .... (6)
(C _B -B) / (AB) = D _B  (7)
(C _P -B) / (A-B) = D '(8)

  In the high shear device and the high shear method of the present invention, when the plasticized polymer material is sheared at a high speed by rotating the internal feedback screw at a high speed, the polymer material rapidly increases in temperature due to shear heat generation or friction heat generation. However, the viscosity of the internal feedback screw drive source is detected by the torque sensor, and the rotation speed of the internal feedback screw is detected by the rotation speed sensor. The temperature of the polymer material is lowered by changing the opening of the cooling means according to the change.

  And when searching for processing conditions, searching for different dispersion conditions, changing materials, etc., when it is necessary to change the rotation speed, the opening of the cooling means according to changes in torque or rotation speed Can be suitably changed. This enables high-speed rotation during high shearing of polymer materials and temperature control by quickly responding to rapid temperature changes, enabling efficient dispersion and mixing at the nano level, with high precision not available with conventional high shear devices This makes it possible to produce products dispersed at the nano level in a short time.

It is a partially broken top view which shows schematic structure of the high shear device by embodiment of this invention. It is a partially broken top view which shows the principal part structure of a high shear unit. It is a partially broken enlarged plan view of a high shear device. It is an expanded sectional view of the high shear unit shown in FIG. It is a timing chart which shows the torque at the time of high shear, resin temperature, and front part and rear resin pressure. It is a block diagram of the conventional cooling temperature control means used for a high shear device. It is a timing chart which shows the motor torque at the time of high shear, and the opening degree of a cooling valve. It is a figure which shows the difference of the transparency by the rotation speed and rotation time of PC / PMMA (8: 2). It is a block diagram of the conventional cooling temperature control means used for a high shear device. It is a flowchart which shows the high shear method in this embodiment. It is a flowchart for setting the cooling valve opening degree at the time of high shear. It is a partially broken side view which shows schematic structure of the conventional high shear part.

  Hereinafter, a high shear device and a high shear method according to an embodiment of the present invention will be described with reference to FIGS.

  First, the high shear device 1 of the present embodiment shown in FIG. 1 has a nano-level internal structure of a resin by kneading a polymer blend resin, which is a polymer material, in a molten state while applying a high shear force. Until it is dispersed and mixed.

  As shown in FIG. 1, the high shear device 1 includes, for example, a plasticizing unit 10 that plasticizes and melts a solid polymer blend resin (hereinafter referred to as “solid resin”) in a pellet shape. And a high shearing unit 20 (high shearing part) for injecting the molten resin plasticized by the plasticizing unit 10 from the injection part 22 and making it nano-dispersed.

Here, examples of the polymer material to be processed by the high shear device 1 include blend materials such as an incompatible polymer blend system, a polymer / filler system, and a polymer blend / filler system resin material. Examples of the incompatible polymer blend system include a combination of polyvinylidene fluoride (PVDF) and polyamide 11 (PA11), and a combination of polycarbonate (PC) and polymethyl methacrylate (PMMA). Examples of the polymer / filler system include a combination of polylactic acid and carbon nanotubes (CNT), and examples of the polymer blend / filler system include a combination of PVDF, polyamide 6, and CNT.
In the present invention, the present invention is not limited to the polymer-based blend material, and other blend materials or a single molecular material that is not blended can be nano-dispersed by high shear.

  The plasticizing unit 10 is provided with a heating tube 11 (plasticizing heating tube) having a substantially hollow cylindrical shape and a rod-like shape that is inserted through the heating tube 11 and kneaded to melt and plasticize and melt the charged solid resin. A plasticizing screw 12 and an injection nozzle 15 for injecting molten resin into the high shear unit 20 are provided.

  The plasticizing screw 12 is provided so that the axis of the heating cylinder 11 and the center axis are coaxially arranged, and the center axis is oriented in a substantially horizontal direction so as to be rotatable around the center axis in the heating cylinder 11 and in the direction of the center axis It is provided so that it can move forward and backward. Further, the plasticizing screw 12 is provided by connecting the base end portion 12a side at one end side in the central axis direction thereof to a driving portion 13 for rotating and advancing and retreating the plasticizing screw 12.

  Here, the drive unit 13 includes a rotation mechanism 13 </ b> A that rotates the plasticizing screw 12 and an injection mechanism 13 </ b> B that causes the plasticizing screw 12 to advance and retract to inject molten resin from the injection nozzle 15. .

  The rotation mechanism 13A includes a first drive motor 132 fixed on the fixed portion 131, and a screw rotation shaft 133 to which the rotational force of the first drive motor 132 is transmitted. The plasticizing screw 12 is provided by connecting the base end portion 12a to the screw rotating shaft 133 via a connecting member 134. At this time, the plasticizing screw 12 is provided so as to be connected to the drive unit 13 so that the screw rotation shaft 133 and the mutual axis are arranged coaxially, that is, the mutual axis is arranged in a straight line. ing.

  The injection mechanism 13B includes a ball screw 135 provided with a rotational axis direction parallel to the central axis direction of the plasticizing screw 12 and fixed to the fixing portion 131, and a nut provided by screwing with the ball screw 135. 136 and a second drive motor 137 that transmits a rotational force to the nut 136 and is disposed separately from the fixed portion 131. Then, by rotating the nut 136 by the rotational drive of the second drive motor 137, the ball screw 135 screwed into the nut 136 is advanced and retracted, and the fixing portion 131 that fixes and supports the ball screw 135 is the first drive motor 132, The plasticizing screw 12 connected to the screw rotating shaft 133 is advanced and retracted in the direction of the central axis by reciprocating (reciprocating) integrally with the screw rotating shaft 133.

  On the other hand, the heating cylinder 11 is disposed in a substantially horizontal direction through the plasticizing screw 12. At this time, the heating cylinder 11 is provided such that the plasticizing screw 12 and the center axis of each other are arranged coaxially. In addition, a plurality of heaters 16 are attached to the outer peripheral surface of the heating cylinder 11 so as to cover the outer peripheral surface, and a temperature sensor 18 is inserted and attached (see FIG. 3). And by controlling the temperature of the heater 16 based on the temperature in the heating cylinder 11 that is measured at any time by the temperature sensor 18, the temperature of the heating cylinder 11 can be adjusted, and thus the solid resin in the heating cylinder 11 is adjusted. While melting, the temperature of the molten resin kneaded by the plasticizing screw 12 can be controlled.

  A hopper 14 for supplying a solid resin is provided at the base end portion 12 a of the plasticizing screw 12 extending outward from the heating cylinder 11, and the hopper 14 is provided at the base end portion 11 a of the heating cylinder 11. A hopper base 17 having an insertion hole 17a for supporting and dropping the solid resin supplied to the hopper 14 to the base end portion 12a side of the plasticizing screw 12 is fixedly provided.

  Further, an injection nozzle 15 is attached to the distal end portion 11b of the heating cylinder 11, and the injection nozzle 15 has an inner space portion (plasticity) through which the plasticizing screw 12 of the heating cylinder 11 is inserted through the flow path (injection port 15a). It is attached in a state where it is communicated with the conversion region R). The plasticizing region R is a space between the heating cylinder 11 and the plasticizing screw 12 and is a region where the solid resin supplied from the hopper 14 is fed forward while being melted.

  And in the plasticizing unit 10 of this embodiment, the injection nozzle 15 (injection part) is provided in the injection | pouring part 22 of the high shear unit 20 so that attachment or detachment is possible, and it heats when the plasticization screw 12 rotates and advances / retreats. The molten resin plasticized in the cylinder 11 is configured to be injected from the injection nozzle 15 to the high shear unit 20.

  Next, as shown in FIGS. 1 to 3, the high shear unit 20 of the present embodiment includes a substantially hollow cylindrical heating cylinder 21 (material heating cylinder) having a molten resin injection portion 22, and the heating cylinder 21. A substantially cylindrical internal feedback screw 23 that is rotatably provided around the central axis in a state of being inserted into the shaft, a shaft 25 connected to the base end 23b side of the internal feedback screw 23, and the shaft A drive motor (drive source) 24 for rotating the internal feedback screw 23 via 25, an anti-vibration support portion 27 for rotatably supporting the shaft 25 via a bearing 26, and a tip of the internal feedback screw 23 And a tip holding portion 28 having a T-die 29 which forms a forming portion disposed on the side.

  The high shear unit 20 is arranged so that the internal feedback screw 23 for high shearing the molten resin injected from the plasticizing unit 10 has its rotational axis direction orthogonal to the rotational axis direction of the plasticizing screw 12. It is installed.

  Further, the heating cylinder 21 and the internal feedback screw 23 are provided with their central axes coaxially arranged. Further, the heating cylinder 21 is provided with a slit 211 on the substantially lower side on the rear side, and the shaft 25 is provided with a thread groove portion 251 having a reverse screw shape on the outer peripheral surface of the portion arranged behind the slit 211. ing. Further, the heating cylinder 21 is provided with a tapered surface 212 for guiding the molten resin to separate it from the shaft 25, and the shaft 25 is provided with a shaft tapered surface 252 on the tip side with respect to the anti-vibration support portion 27. It has been. As a result, the molten resin leaked rearward from the heating cylinder 21 is discharged from the slit 211 as the shaft 25 rotates, and the remaining leaked resin is guided to the screw groove portion 251 and sent backward. The leaked resin is discharged from the taper surface 212 or is cooled and solidified by the shaft taper surface 252 and splits.

  As shown in FIGS. 2 and 3, the heating cylinder 21 of the high shear unit 20 has an outer peripheral surface covered with a heater 38, and the temperature can be adjusted by controlling the temperature of the heater 38. The heating cylinder 21 has a base end portion 21b supported by the main body support portion 30, and a tip end holding portion 28 is connected to the tip end portion 21a. Further, the heating cylinder 21 is an inner space (in other words, a high shear region which is a substantially cylindrical gap between the heating cylinder 21 and the internal feedback screw 23) in which the internal feedback screw 23 is rotatably accommodated in the injection portion 22. An injection path 22a communicating with K) is formed. Then, the injection port 15a of the injection nozzle 15 is engaged with the opening on the outer peripheral side of the injection passage 22a, and the molten resin injected from the injection nozzle 15 passes through the injection passage 22a of the injection portion 22 to the high shear region in the heating cylinder 21. K is configured to be supplied to K.

  Here, as shown in FIG. 4, the injection path 22 a of the injection portion 22 is formed on the front side of the discharge port 231 b of the feedback hole 231 provided near the rear end of the internal feedback screw 23. In the middle of the injection path 22a, an injection valve 31 that can be opened and closed for adjusting the inflow amount of the molten resin injected from the plasticizing unit 10 into the inner space of the heating cylinder 21 is provided as injection means. . The injection valve 31 is an automatic opening / closing type injection means for controlling the injection amount of the molten resin according to a preset time or the like.

The internal feedback type screw 23 is rotatably provided in a state of being inserted substantially coaxially in the heating cylinder 21, and its base end portion 23 b is coaxially connected to the shaft 25 connected to the rotation shaft of the drive motor 24. Are connected in a state of being arranged. Further, the internal feedback screw 23 is formed in a substantially cylindrical shape, and a helical screw blade 23c projects from the outer peripheral surface thereof. Then, the internal feedback screw 23 is rotated at a high speed, for example, at a rotational speed of 100 to 3300 min ⁻¹ by the drive motor 24, and kneaded while moving the molten resin in the high shear region forward to perform high shear.

  In addition, a feedback hole 231 is formed in the internal feedback screw 23 along the central axis that is the center of rotation, and this feedback hole 231 has an inlet 231a opened at the tip 23a to inject molten resin. A discharge port 231b is provided on the outer peripheral surface of the internal feedback screw 23 on the rear side of the path 22a. The return hole 231 extends rearward from the inflow port 231a on the central axis of the internal feedback screw 23, smoothly curves at a position near the discharge port 231b, deviates from the central axis, and substantially in the radial direction toward the outer peripheral surface. It has a flow path that extends outward and communicates with the discharge port 231b. The return hole 231 communicates with the high shear region K through the inflow port 231a and the discharge port 231b.

  Also. The inlet 231a of the return hole 231 is on the upstream side of the molten resin flowing in the return hole 231 during high shear, and the discharge port 231b is on the downstream side. That is, the molten resin injected into the high shear region K is sent to the tip side along the groove surface 23d along with the rotation of the internal feedback screw 23, and from the inlet 231a in the gap between the tip portion 23a and the tip holding portion 28. It flows into the return hole 231, flows backward, is discharged from the discharge port 231 b, and is sent to the tip side again with the rotation of the internal feedback screw 23. Thereby, the molten resin is circulated.

  As shown in FIG. 4, the internal feedback screw 23 is formed so that the groove surface 23d between the screw blades 23c is parallel to the central axis as an outer peripheral surface. That is, a gap between the inner surface 21c of the heating cylinder 21 and the groove surface 23d on the outer peripheral surface of the internal feedback screw 23 is formed at a constant interval S1 over the central axis direction. The high shear region K is formed by the gap S1 and the gap S2.

  For this reason, the gap on the outer peripheral side of the screw on the tip side is not reduced unlike the conventional internal feedback screw in which the groove surface 23d of the internal feedback screw 23 has a compression shape (tapered shape). Thereby, circulation of the molten resin required for kneading becomes smooth, and it becomes possible to increase high shear efficiency.

  In addition, the screw shape can be widened and high shear can be performed, and the internal feedback screw 23 having an appropriate shape can be used in accordance with conditions such as the material of the molten resin and processing ability. Further, the base end portion 23b of the internal feedback screw 23 is provided at a position outside the range of the high shear region K where the screw blades 23c are not formed, and is in a cylindrical region formed with the same outer diameter as the screw blades 23c. Become. For this reason, the base end portion 23b can slide with respect to the inner surface 21c of the heating cylinder 21 while maintaining a liquid-tight state.

  On the other hand, as shown in FIG. 2, the heating cylinder 21 is provided with a resin pressure sensor 33 for detecting the resin pressure on the front side and the rear side in the central axial direction of the internal feedback screw 23. The detection units of the front resin pressure sensor 33 </ b> A and the rear resin pressure sensor 33 </ b> B are disposed so as to be exposed to the high shear region K in the heating cylinder 21. Thereby, the resin pressure (material pressure) near the front end 23a (near the inlet 231a) of the internal feedback screw 23 is detected by the front resin pressure sensor 33A, and the discharge port 231b of the feedback hole 231 is detected by the rear resin pressure sensor 33B. A nearby resin pressure (second pressure) is detected.

The high shear unit 20 controls the driving of the cooling valve 40 and the like based on the detection result of the temperature sensor 34 that detects the heating temperature of the heater 38, the temperature of the injection valve 31, the discharge valve 32, the heating cylinder 21, and the like. And the control means 2 which controls the cooling temperature of the heating cylinder 21 is provided.
The high shear device 1 of the present embodiment is configured by separating the plasticizing unit 10 and the high shear unit 20, and heats or plasticizes the resin in a high shearing machine equipped with an internal feedback screw 23. Therefore, it is not necessary to provide a melting function such as, so that the control means 2 can perform optimum control that meets the high shear condition.

  Further, as shown in FIGS. 2 and 3, a discharge path 29 a that communicates through the gap S <b> 2 of the high shear region K of the heating cylinder 21 is formed in the tip holding portion 28 connected to the heating cylinder 21. The discharge passage 29a in the tip holding portion 28 is provided with a T-die 29 that forms a forming portion whose opening cross-section increases toward the discharge side on the discharge side. In addition, the temperature of the tip holding portion 28 can be adjusted by a heater 38.

  A discharge valve 32 for adjusting the discharge amount of the nano-dispersed resin discharged from the high shear region K is provided as discharge means in the middle of the discharge path 29a. The discharge valve 32 is an automatic opening / closing type discharge means for controlling the discharge amount in accordance with a preset high shear kneading time or the like, and is interlocked with the opening / closing operation of the injection valve 31.

  That is, the injection valve 31 and the discharge valve 32 are configured to be able to control the injection of the molten resin and the discharge of the highly sheared molten resin at an arbitrary timing by the output signal from the control means 2. This makes it possible to arbitrarily set the high shear kneading time, the discharge time, and the injection time.

  In addition, as shown in FIG. 2, the heating cylinder 21 and the tip holding portion 28 are provided with temperature sensors 34 (34A, 34B, 34C, 34D) at appropriate positions, and the heating cylinder 21 and the tip at the time of high shear. The temperature of the holding unit 28 is input to the control means 2 and managed, and the temperature can be adjusted by the heater 38.

  Further, as shown in FIG. 3, cooling channels 35, 36, and 37 are provided in the heating cylinder 21, the main body holding unit 30, and the anti-vibration support unit 27, respectively. A cooling medium such as water, air, gas, or the like flows from the cooling medium tank 39 to the cooling flow paths 35, 36, and 37 through each pipeline. A cooling valve 40 for controlling the flow rate of the cooling medium is provided in the pipe line of the heating cylinder 21.

  The first cooling flow paths 35A and 35B (35) embedded in the heating cylinder 21 are disposed in a substantially ring shape or spiral shape, for example, in the vicinity of the tip 23a of the internal feedback screw 23 and in the vicinity of the feedback hole outlet 231b. . The first cooling channels 35 </ b> A and 35 </ b> B are for adjusting the cooling temperature of the heating cylinder 21 by controlling the flow rate of the cooling medium by the cooling valve 40.

  The cooling valve 40 is an electromagnetic valve controlled by the control means 2, for example, and is an on-off valve that adjusts the flow rate of the cooling medium by controlling the opening degree of the valve body. Instead of this, an opening adjustment valve that controls the opening and closing of the valve body by ON / OFF switching and adjusts the flow rate of the cooling medium by the opening and closing rate may be adopted. In the present embodiment, the first cooling flow paths 35A and 35B, the cooling valve 40 provided in the pipeline, and the cooling medium tank 39 constitute a cooling means 41 for cooling the polymer material in the high shear region K. ing.

  The second cooling channel 36 of the main body holding unit 30 is provided to cool the outer region corresponding to the proximal end portion 23 b of the internal feedback screw 23 of the heating cylinder 21. The third cooling flow path 37 of the anti-vibration support unit 27 cools the shaft 25 by the anti-vibration support unit 27, and thereby the heat transmitted from the heating cylinder 21 through the shaft 25 and the heat transmitted from the drive motor 24. Protect the bearing 26.

  Next, the cooling temperature control means for the molten resin in the heating cylinder 21 in this embodiment will be described.

  In the high shear unit 20, when the molten resin supplied to the high shear region K is rotated at a high speed by rotating the internal feedback screw 23 at a high speed, a shear force is applied when the internal feedback screw 23 is rotated at a high speed. Internal resin pressure is important. That is, the molten resin has a low viscosity when the temperature is high, and increases when the temperature is low. On the other hand, when the molten resin is sheared, the resin temperature rapidly rises due to heat generated by shear resistance or shear friction. For this reason, when a high shear is applied to the molten resin, the resin temperature rises rapidly, so that the viscosity is lowered, the shearing force is reduced, and a high shearing force cannot be applied.

  In particular, at the initial stage when high-speed rotation is started by the internal feedback screw 23, shear resistance and shear friction are the highest, and the high shear time by high-speed rotation is about 300 seconds to 10 seconds in this embodiment, preferably Since it is a short time of about 120 seconds to 10 seconds, it is necessary to stabilize the rapidly rising resin temperature by reducing it in a timely manner.

  The high shear unit 20 is provided with temperature sensors 34A to 34D in the heating cylinder 21 and the tip holding portion 28. The temperature sensors 34A to 34D detect the temperature, and the temperature in the cooling channels 35A and 35B. Even if the flow rate of the cooling medium is controlled, the temperature sensors 34 </ b> A to 34 </ b> D have poor heat conduction responsiveness and are delayed in cooling, and therefore cannot cope with high shear in a short time.

  Here, FIG. 5 shows a polymer blend resin material, for example, a mixture of a polycarbonate resin and an acrylic resin mixed at a mixing ratio of 8: 2 and melted at a temperature of about 220 ° C. to 240 ° C. in the plasticizing unit 10. The graph which supplied torque to the high shear unit 20 and measured torque, resin temperature, etc. in the process of one high shear is shown. The resin temperature is measured by a temperature sensor 34B provided at the tip holding portion 28 facing the tip portion 23a of the internal feedback screw 23.

As shown in FIG. 5, when the internal feedback screw 23 is rotated at a high speed of, for example, 2500 min ⁻¹ for 60 seconds, the torque of the drive motor 24 that drives the internal feedback screw 23 and the front resin pressure P1 are the number of rotations. It rises with good response to the sudden rise. Further, the measurement of the resin temperature in the high shear region K rises to about 250 ° C. behind the torque and front resin pressure. From this result, it can be said that it is preferable to perform the cooling control of the molten resin by using the torque or the front resin pressure because of good responsiveness.

  For this reason, the applicant of the present application has already detected the torque of the drive motor 24 in Japanese Patent Application No. 2010-111222, and controls the cooling temperature of the molten resin to control the flow rate of the cooling medium in the first cooling flow paths 35A and 35B. Therefore, the present inventors have applied for an invention of a high shearing apparatus and a high shearing method that can rapidly reduce the resin temperature and control the shearing resistance to be high and perform high shearing processing with high efficiency in a short time.

  Specifically, in the high shear device 1 of this Japanese Patent Application No. 2010-111222, a torque sensor 44 for detecting the torque is provided in the drive motor 24 of the internal feedback screw 23 shown in FIGS. 1 and 2, as shown in FIG. In addition, torque threshold setting means 46 for setting an upper limit threshold value A and a lower limit threshold value B of torque in addition to torque is provided as data input to the cooling temperature control means provided in the control means 2. These upper limit threshold value A and lower limit threshold value B are appropriately set according to the material to be sheared at high speed and the high speed revolution number, etc. The initial opening at the initial stage of shearing is set in advance between the upper threshold A and the lower threshold B.

  Further, torque sampling means 49 is provided for sampling the peak torque (maximum torque) generated immediately after the high speed rotation of the internal feedback screw 23 from the actually measured torque C inputted from the torque sensor 44 and the torque that fluctuates before and after the peak torque. ing. Further, based on the detected peak torque (hereinafter, the peak torque C is indicated by the symbol Cp) and the torque C before and after the peak torque, the maximum opening D of the cooling valve 40 and the openings before and after the following equation (9) A cooling valve opening degree calculation means 51 for calculating D and a cooling valve opening degree fixing means 52 for fixing the cooling valve 40 to the maximum opening degree for a short time set by the delay timer 50 are provided. Then, a signal of the cooling valve opening D calculated by the cooling valve opening calculating means 51 is output to the cooling valve 40.

(C−B) / (A−B) = D (9)
However, A>C> B

  Here, when the peak torque Cp is detected by the torque sampling means 49, the delay timer 50 calculates a maximum opening D (hereinafter, this maximum opening is indicated by a symbol Dp) by the above equation (9). The opening degree Dp is a predetermined time, for example, a time t of several seconds to about 20 seconds from the time of high shear start, that is, the initial opening degree of the cooling valve 40, and the cooling valve opening fixing means 52 regardless of the change in the torque C thereafter. Hold fixed by. As a result, as shown in FIG. 7, the cooling valve 40 is held at the maximum opening Dp for a predetermined delay time t even after the torque has decreased from the maximum torque Cp, and the cooling processing of the molten resin in the high shear region K is rapidly performed. It becomes possible to proceed to.

  Further, at this time, the opening degree D of the cooling valve 40 is basically the maximum opening degree Dp after the resin temperature suddenly rises from the fixed opening degree at the time of high shear start and then suddenly drops to the assumed temperature. The first half, which fluctuates rapidly through the delay time, is the transitional cooling mode, and the subsequent cooling mode is a stable cooling mode in which the change in opening is small and the resin temperature is kept at a stable assumed temperature. Is controlled accordingly. The assumed temperature refers to a stable steady-state temperature with small torque fluctuation and small resin temperature change (see FIG. 5).

  On the other hand, if the opening degree D of the cooling valve 40 is changed based on the equation (9) according to the fluctuation of the torque C without providing the delay time t, the resin temperature that rapidly increases cannot be rapidly decreased. For this reason, high shear cannot be performed in a short time. The delay timer may start counting when the peak torque Cp is detected or when the cooling valve 40 is set to the maximum opening Dp.

  In the high shear device 1 of this Japanese Patent Application No. 2010-111222, the delay timer 50 and the cooling valve opening fixing means 52 constitute a delay means. In the cooling temperature control means 45, the torque sampling means 49 and the cooling valve opening calculation. The means 51 constitutes a cooling temperature control means.

  However, when the upper limit threshold A and the lower limit threshold B are specified on the basis of the motor torque as described above and the opening degree D of the cooling valve 40 is controlled, the thermoplastic resin is a non-Newtonian fluid. In general, the higher the shear rate, the higher the clay, and the higher the shearing speed, the lower the motor torque as the rotational speed of the internal feedback screw 23 increases.

  That is, the motor torque increases as the rotational speed decreases. Usually, if the rotational speed is increased, the shear stress increases. However, if the rotational speed is increased, the motor torque decreases, and the opening of the cooling valve 40 that changes the flow rate of the cooling water decreases accordingly. turn into. Specifically, when the opening degree D of the cooling valve 40 is controlled on the basis of the torque, since the motor output = the motor rotational speed × the motor torque, for example, the motor rotational speed is doubled and the motor torque is 0.8 times. In this case, the opening degree D of the cooling valve 40 is reduced by 0.8 times.

  For this reason, there is no problem if the high shearing process is continuously repeated and the rotational speed is not changed, but when searching for the optimum conditions while changing the rotational speed, it seems as if it is inversely proportional to the rotational speed. There is a problem that it is necessary to change the upper limit threshold A and the upper limit threshold B. That is, for example, when a polymer blend resin material, for example, a mixture of polycarbonate resin and acrylic resin at a mixing ratio of 8: 2, is subjected to high shear processing, as shown in FIG. The transparency (transparent, opaque) of is changed. In addition, the viscosity of the raw resin may vary depending on the manufacturer. For this reason, when searching for processing conditions, when searching for a different dispersion state, or when changing materials, it is necessary to change the rotational speed, and the upper limit threshold A is set as if it is inversely proportional to the rotational speed. There arises a problem that the upper threshold value B needs to be changed.

  In contrast, in the high shear device 1 of the present embodiment, as shown in FIG. 9, a torque sensor 44 for detecting the torque is provided in the drive motor 24 of the internal feedback screw 23, and the internal feedback screw 23 is installed. A rotation speed sensor 60 for detecting the rotation speed of the drive source (drive motor 24) to be driven is provided. Then, as data to be input to the cooling temperature control means provided in the control means 2, the rotational speed is input through the rotational speed sampling means 61 in addition to the torque, and the cooling valve opening calculation means according to these torque and rotational speed. The cooling valve opening signal calculated in 51 is output to the cooling valve 40.

That is, in the high shear device 1 of the present embodiment, the torque (current torque value) _TP and the rotational speed N are input to the cooling temperature control means provided in the control means 2, and the input torque _TP and rotation are input. From the number N, the motor output P (P = T _P × N) is obtained by the cooling valve opening calculation means 51. Then, the upper threshold P _A and the lower limit threshold P _B of the motor output P which is set in advance by the motor output threshold value setting means 62, the opening D 'is the calculation of the cooling valve 40 by the following equation (10) Then, a signal of the cooling valve opening degree D ′ is output to the cooling valve 40.

( _TP × N−P _B ) / (P _A −P _B ) = D ′ (10)
However, PA> TP × N> PB

  When the opening degree D ′ of the cooling valve 40 is controlled based on the motor output (motor rotational speed × motor torque) as described above, for example, when the motor rotational speed is doubled and the motor torque is 0.8 times. The opening degree D ′ of the cooling valve 40 becomes 1.6 times, and the opening degree does not decrease as in the case where the opening degree is controlled based on the torque.

  Next, a method for high shearing a polymer blend resin, which is a polymer material, using the high shear device 1 of the present embodiment having the above configuration will be described with reference to the flowchart shown in FIG. The polymer blend resin is described as using, for example, an incompatible polymer blend system, a polymer / filler system, a polymer blend / filler system solid resin material, etc. Of course, other polymer materials are used. May be used.

First, an outline of the high shearing process will be described with reference to FIG.
In the high shear device 1 shown in FIG. 1, a resin obtained by mixing two or more kinds of resins as described above is used as the polymer blend-based solid resin. In the heating cylinder 11, the plasticizing screw 12 is rotated at an appropriate low speed by driving the first drive motor 132 of the rotation mechanism 13A. The heating cylinder 11 is heated to an appropriate temperature by the heater 16 in advance.

  Under this condition, a required amount of solid resin is charged into the heating cylinder 11 from the hopper 14 of the plasticizing unit 10 (step S1). While the plasticizing screw 12 is rotated in the plasticizing region R in the heating cylinder 11, the solid resin is heated and plasticized by the heater 16 (step S2). The resin in the plasticizing region R is plasticized and kneaded to become a molten resin, and the plasticization of the resin in the plasticizing unit 10 is completed (step S3).

Next, the molten resin in the plasticizing unit 10 is injected into the heating cylinder 21 of the high shear unit 20 (steps S4 to S7).
Specifically, at the timing when a molten resin having a desired property is obtained, the injection valve 31 and the discharge valve 32 of the high shear unit 20 are opened by the output signal from the control means 2, and the injection path 22 a of the high shear unit 20. And the discharge path 29a is opened (step S4). Then, by driving the second drive motor 137, the ball screw 135 is moved forward together with the fixing portion 131 via the nut 136. Then, the screw rotating shaft 133 on the fixed portion 131 moves forward, so that the plasticizing screw 12 moves forward in the axial direction in the heating cylinder 11. The plasticizing screw 12 injects the molten resin from the injection nozzle 15 into the heating cylinder 21 of the high shear unit 20 in the heating cylinder 11.

In the high shear unit 20, the internal feedback screw 23 in the heating cylinder 21 is rotated at a low speed, for example, at 400 min ⁻¹ (step S <b> 5). At this time, since the high shear region K in the heating cylinder 21 of the high shear unit 20 before injection is empty, the internal air is discharged from the discharge path 29a by injecting the molten resin, and the high shear unit 20 The heating cylinder 21 is gradually filled with molten resin (step S6).

  When the injection of the molten resin is completed (step 7), the control means 2 closes the injection valve 31 and the discharge valve 32 and closes the flow paths 22a and 29a. Note that the timing for determining the completion of injection can be determined by the pressure values of the front resin pressure P1 and the rear resin pressure P2 detected by the resin pressure sensors 33A and 33B. Specifically, the injection is completed by detecting a point in time when the front resin pressure P1 and the rear resin pressure P2 start to rise from a stable state.

  When the injection valve 31 and the discharge valve 32 are closed (step S8), high shear is performed by the high shear unit 20 (step S9). In the plasticizing unit 10, by closing the injection valve 31 and the discharge valve 32, a process in which a new solid resin is supplied and plasticization is performed in parallel with the high shear in the high shear unit 20 is performed in steps S1 to S1. Repeat in S3.

In the high shear unit 20, the internal feedback screw 23 in the heating cylinder 21 is rotated at a high speed. The high speed rotation speed is determined by the resin material to be charged. In the present embodiment, a high speed from the low speed as described above 400 super ～3300Min ^-1, is rotated, for example 2500min ^-1, to set time, for example 60 seconds high shear to the molten resin in the high shear region K Thus, the molten resin is nano-dispersed to form a nano-dispersed resin.

As shown in FIG. 4, the molten resin injected into the high shear region K is sent to the tip side mainly on the groove surface 23 d along with the high-speed rotation of the screw 23 on the outer peripheral surface side of the internal feedback screw 23. Then, at the tip 23a of the internal feedback screw 23, it flows backward from the gap S2 into the feedback hole 231 through the inlet 231a, flows out from the discharge port 231b to the outer peripheral surface of the internal feedback screw 23, and returns to the groove surface 23d. Then, the circulating flow of being sent to the tip side again is repeated at a high speed for a predetermined time.
As a result, the molten resin is kneaded and a high shear stress is applied. By this circulation, the molten resin is nano-dispersed, and the internal structure is dispersed and mixed at the nano level.

Next, when the set high shearing time is reached (step S10), the rotation speed of the internal feedback screw 23 is switched from high speed rotation to medium speed rotation (step S11). The medium speed rotation is a rotation speed region that is larger than the low speed rotation and smaller than the high speed rotation, and is, for example, more than 400 to 1000 min ⁻¹ . Then, the injection valve 31 and the discharge valve 32 are opened (step S12), and the highly dispersed nano-dispersed resin in the high shear region K is discharged from the discharge path 29a on the distal end side with the rotation of the internal feedback screw 23 ( Step 13), the molten resin discharged from the T-die 29 can be obtained as a polymer blend extrudate.

When the discharge time set in advance is reached (step S14) and the nano-dispersed resin manufactured in the heating cylinder 21 of the high shear unit 20 is completely discharged, the process returns to step S5 again. Here, in parallel with the high-speed rotation of the internal feedback screw 23, a new molten resin is manufactured by the plasticizing unit 10 and the processing is completed (steps S1 to S3).
Therefore, the molten resin is injected from the plasticizing unit 10 through the injection nozzle 15 (step S6) while rotating the internal feedback screw 23 of the high shear unit 20 from the medium speed rotation to the low speed rotation (step 5).
In this way, by repeating the same treatment, the resin can be sequentially highly sheared to disperse and mix the internal structure at the nano level.

  Next, a method for cooling the resin during high shear will be described.

First, prior to the start of the high shear, in advance set the internal feedback motor output upper limit threshold P _A and the lower limit threshold P _B of the drive motor 24 of the screw 23 in the control unit 2. In addition, an initial opening degree D of the cooling valve 40 for supplying a cooling medium to the cooling flow paths 35A and 35B in the heating cylinder 21 at the beginning of high shear is also set.

Then, the high feedback processing is started by rotating the internal feedback screw 23 at a high speed, for example, 2500 min ⁻¹ . The rotational speed of the internal feedback screw 23 when the molten resin is injected from the plasticizing unit 10 into the heating cylinder 21 of the high shear unit 20 is, for example, a low speed of 400 min ⁻¹ , and the temperature of the molten resin is the plasticizing unit. Since it is almost the same as the temperature at 10, the resin temperature at the start of high shear is low and the viscosity is high.

When the internal feedback screw 23 is rotated at a high speed from this state, the high-speed rotation is started at, for example, 2500 min ⁻¹ . Since the resin temperature is relatively low immediately after the start of high-speed rotation, the torque of the drive motor 24 increases abruptly, a large shearing heat is generated due to a large shear resistance, and the resin temperature also increases rapidly. In response to the rapid increase in torque, the front resin pressure P1 in the high shear region K also increases rapidly.

  At the start of the high shearing process, the cooling valve 40 is set to a fixed initial opening, and the torque C of the drive motor 24 detected by the torque sensor 44 is input to the torque sampling means 49 of the cooling temperature control means 45, Further, the rotational speed N of the drive motor 24 detected by the rotational speed sensor 60 is input to the rotational speed sampling means 61 of the cooling temperature control means 45. In addition, a signal is output to the delay timer 50 and the delay timer 50 starts counting.

The cooling in the valve opening calculating means 51, the motor output _{P (P = T P × N} ) is obtained, further, upper threshold P _A of the motor output P which is set in advance by the motor output threshold value setting means 62 From the lower limit threshold P _B , the opening degree D ′ of the cooling valve 40 is calculated by the above-described equation (10). A signal of the cooling valve opening D ′ is output to the cooling valve 40, and the cooling valve 40 is controlled to the opening D ′.

  As a result, the opening does not decrease as when the opening is controlled based on torque, so the rotation speed can be changed when searching for machining conditions, searching for different dispersion conditions, or changing materials. When this becomes necessary, the motor output (the number of revolutions) changes, and the opening D ′ of the cooling valve 40 automatically changes following this, as if inversely proportional to the number of revolutions as in the prior art. Therefore, it is not necessary to change the upper limit threshold value A and the upper limit threshold value B, and high shear processing can be suitably performed.

  Therefore, the polymer material is rotated at a high speed during high shear and temperature control is performed in response to a rapid temperature change, enabling efficient dispersion and mixing at the nano level, with high accuracy not available with conventional high shear devices. It becomes possible to manufacture a product dispersed at the nano level in a short time.

  The embodiments of the high shear device 1 and the high shear method according to the present embodiment have been described above, but the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. is there.

For example, in this embodiment, the motor output P is obtained by the cooling valve opening degree calculation means 51 from the torque _TP and the rotation speed N, and the upper limit threshold value P of the motor output P preset by the motor output threshold value setting means 62 is obtained. 'calculated and the cooling valve opening D' opening D of the cooling valve 40 from the _a and lower threshold P _B was described as controlling the opening D 'of the cooling valve 40 by a signal.

  On the other hand, in Japanese Patent Application No. 2010-111222 by the applicant of the present application, the upper limit threshold value of the torque of the driving source for rotating the internal feedback screw 23 at a high speed is set to A, and the lower limit threshold value is set to B. Assuming that the torque is C (A> C> B), the opening degree (or opening ratio) D of the cooling valve 40 is set by the above-described equation (9) ((CB) / (AB) = D). It is possible to do it.

  In other words, when it is desired to increase the maximum opening, the upper limit threshold A is decreased, and when the minimum opening is increased, the lower limit threshold B may be decreased. Furthermore, even if only the minimum opening is desired to be changed, if the lower limit threshold B is changed, the maximum opening is also changed.

  Based on this, the maximum opening degree and the minimum opening degree are set and inputted in advance, and the upper limit threshold value A and the lower limit threshold value B are calculated automatically or semi-automatically by button operation. The opening D ′ may be controlled.

That is, the maximum opening D _A and the minimum opening D _B input in advance can be expressed by the following expressions (11) and (12). Here, _{C A} is the maximum motor output, _{C B} is the minimum motor output, expressed by the following equation (13), equation (14). The equation (13), _{T A} in the formula (14) is a torque at the maximum motor output, _{T B} is the minimum motor output when the torque, _{N P} is a constant rotational speed.

(C _A -B) / (A-B) = D _A (11)
(C _B -B) / (A-B) = D _B (12)

C _A = T _A × N _P (13)
C _B = T _B × N _P (14)

  By these formulas (11) to (14), the upper limit threshold value A and the lower limit threshold value B of the motor output (torque) become the following formulas (15) and (16).

A = B- (100 × (C _A -C _B ) / (D _B -D _A )) (15)
B = (C _A × D _B −C _B × D _A ) / (D _B −D _A ) (16)

Then, the opening degree D ′ of the cooling valve 40 is obtained from the following equation (17) from the upper threshold value A and the lower threshold value B obtained in this way. C _P in the equation (17) is a current of the motor output value (current torque × rotational speed).

_{(C P -B) / (A} -B) = D '··· (17)

  Thereby, even when it is desired to change only the maximum opening or only the minimum opening, it is possible to easily change the opening. Moreover, even if the rotation speed and maximum / minimum opening at the time of cooling setting differ from the current execution value by automatically following the cooling opening as in this embodiment, the current state can be changed with a single button operation. It can be easily reproduced.

Further, in the cooling method in which the upper limit threshold A and the lower limit threshold B are calculated and the cooling opening degree is changed in this way, as shown in FIG. 11, the internal feedback screw 23 is moved at a high speed of, for example, 2500 min ⁻¹ . The high shearing process is started by rotating (step S15). The rotational speed of the internal feedback screw 23 when the molten resin is injected from the plasticizing unit 10 into the heating cylinder 21 of the high shear unit 20 is, for example, a low speed of 400 min ⁻¹ , and the temperature of the molten resin is the plasticizing unit. Since it is almost the same as the temperature at 10, the resin temperature at the start of high shear is low and the viscosity is high.

When the internal feedback screw 23 is rotated at a high speed from this state, the high-speed rotation is started at, for example, 2500 min ⁻¹ . Since the resin temperature is relatively low immediately after the start of high-speed rotation, the torque of the drive motor 24 increases abruptly, a large shearing heat is generated due to a large shear resistance, and the resin temperature also increases rapidly. In response to the rapid increase in torque, the front resin pressure P1 in the high shear region K also increases rapidly.

  At the start of the high shearing process, the cooling valve 40 is set to a fixed initial opening, and the torque of the drive motor 24 detected by the torque sensor 44 is input to the torque sampling means 49 of the cooling temperature control means 45, and the peak Torque is sampled (step S16). Further, a signal is output to the delay timer 50, the count of the delay timer 50 is started, torque waveform sampling is started, and cooling is started from the current maximum torque (step S17).

  Next, after elapse of the delay time by the delay timer 50 (step S18), the opening degree D 'of the cooling valve 40 is calculated by the equation (9), and cooling with the sampled torque is started (step S19). Then, after the elapse of the cycle time (step S20), the high shearing process ends (step S21), and the minimum torque is detected (step S22). The minimum torque detected in this way is used as the previous torque in the next cycle (step S23).

DESCRIPTION OF SYMBOLS 1 High shear device 2 Control means 10 Plasticizing unit (plasticizing part)
11 Heating cylinder (heating cylinder for plasticization)
11b Tip portion 12 Plasticizing screw 12a Base end portion 13 Drive portion 13A Rotation mechanism 13B Injection mechanism 131 Fixed portion 132 First drive motor 133 Screw rotation shaft 134 Connecting member 135 Ball screw 136 Nut 137 Second drive motor 14 Hopper 15 Injection nozzle 15a Injection port 16 Heater 17 Hopper base 17a Insertion hole 18 Temperature sensor 20 High shear unit (high shear part)
21 Heating cylinder (material heating cylinder)
21b Base end part 21c Inner surface 212 Tapered surface 22 Injection part 22a Injection path 23 Internal feedback type screw 23a Front end part 23b Base end part 23c Screw blade 23d Groove surface 231 Return hole 231a Inlet 231b Discharge port 24 Drive motor (drive source)
25 Shaft 251 Thread groove portion 252 Shaft taper surface 26 Bearing 27 Anti-vibration support portion 28 Tip holding portion 29 T-die 29a Discharge passage 30 Main body support portion 31 Injection valve (injection means)
32 Discharge valve 33 Resin pressure sensor 33A Front resin pressure sensor 33B Rear resin pressure sensor 34 Temperature sensor 35 Cooling flow path 36 Cooling flow path 37 Cooling flow path 38 Heater 39 Cooling medium tank 40 Cooling valve (cooling means)
41 Cooling means 44 Torque sensor 45 Cooling temperature control means 46 Torque threshold setting means 49 Torque sampling means 50 Delay timer 51 Cooling valve opening calculation means 52 Cooling valve opening fixing means 60 Rotation speed sensor 61 Rotation speed sampling means 62 Motor Output threshold setting means 100 Conventional high shear machine 101 Heating cylinder 101a Input hole 102 High shear screw 102a Screw blade 103 Input port 104 Pellet sample 105 Output port

Claims (4)

A high shear device for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress,
An internal feedback screw is provided in the material heating cylinder so as to be capable of high-speed rotation, and a high shear portion that applies high shear stress to the plasticized polymer material by rotating the internal feedback screw at a high speed;
Cooling means for lowering the temperature of the polymer material in the material heating cylinder;
A torque sensor for detecting the torque of a drive source for driving the internal feedback screw;
A rotational speed sensor for detecting the rotational speed of the internal feedback screw;
A cooling temperature control means for controlling the temperature of the polymer material by the cooling means according to the torque and the rotational speed detected by the torque sensor and the rotational speed sensor;
Equipped with a,
The upper limit threshold of the output of the driving source is P _A , the lower limit threshold is P _B , the torque detected by the torque sensor is T _P , and the rotation speed detected by the rotation speed sensor is N (P _A > T _P × N> P _B ), and the opening degree D ′ of the cooling means is set by the following equation (1).
( _TP × N−P _B ) / (P _A −P _B ) = D ′ (1) A high shear device for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress,
An internal feedback screw is provided in the material heating cylinder so as to be capable of high-speed rotation, and a high shear portion that applies high shear stress to the plasticized polymer material by rotating the internal feedback screw at a high speed;
Cooling means for lowering the temperature of the polymer material in the material heating cylinder;
A torque sensor for detecting the torque of a drive source for driving the internal feedback screw;
A rotational speed sensor for detecting the rotational speed of the internal feedback screw;
A cooling temperature control means for controlling the temperature of the polymer material by the cooling means according to the torque and the rotational speed detected by the torque sensor and the rotational speed sensor;
With
The maximum opening of the cooling means is D _A , The minimum opening is D _B , The maximum output of the drive source is C _A , The minimum output is C _B (A> C _A , C _B > B), the upper limit threshold value A and the lower limit threshold value B of the output of the driving source are obtained from the relationship of the following formulas (2) and (3),
Torque T detected by the torque sensor _P And the current output value obtained from the rotational speed N detected by the rotational speed sensor is C _P (A> C _P > B), the opening degree D 'of the cooling means is set by the following equation (4).
(C _A -B) / (AB) = D _A  (2)
(C _B -B) / (AB) = D _B  .... (3)
(C _P −B) / (A−B) = D ′ (4) A high shear method for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress,
The high-speed rotation of the internal feedback screw provided in the material heating cylinder causes high shearing of the plasticized polymer material, and the torque of the drive source of the internal feedback screw and the rotation speed of the internal feedback screw are adjusted. Detect
The temperature of the high shear material is controlled by adjusting the flow rate of the cooling medium supplied into the material heating cylinder according to the change in the output of the drive source determined from the torque and the rotational speed,
The upper threshold value of the output of the drive source is P _A , Set the lower threshold to P _B The torque detected by the torque sensor is T _P , N (P _A > T _P × N> P _B ), The flow rate of the cooling medium is controlled by setting the opening D ′ of the cooling means for supplying the cooling medium according to the following formula (1).
(T _P × NP _B ) / (P _A -P _B ) = D '(1) A high shear method for dispersing and mixing a polymer material at a nano level by kneading while applying a high shear stress,
The high-speed rotation of the internal feedback screw provided in the material heating cylinder causes high shearing of the plasticized polymer material, and the torque of the drive source of the internal feedback screw and the rotation speed of the internal feedback screw are adjusted. Detect
The temperature of the high shear material is controlled by adjusting the flow rate of the cooling medium supplied into the material heating cylinder according to the change in the output of the drive source determined from the torque and the rotational speed,
The maximum opening of the cooling means is D _A , The minimum opening is D _B , The maximum output of the drive source is C _A , The minimum output is C _B (A> C _A , C _B > B), the upper limit threshold value A and the lower limit threshold value B of the output of the driving source are obtained from the relationship of the following formulas (2) and (3),
Torque T detected by the torque sensor _P And the current output value obtained from the rotational speed N detected by the rotational speed sensor is C _P (A> C _P > B), the high shearing method is characterized in that the flow rate of the cooling medium is controlled by setting the opening D 'of the cooling means for supplying the cooling medium according to the following equation (4).
(C _A -B) / (AB) = D _A  (2)
(C _B -B) / (AB) = D _B  .... (3)
(C _P −B) / (A−B) = D ′ (4)

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