JP2019171845A - Manufacturing apparatus of composite resin composition and manufacturing method - Google Patents

Abstract

To provide a manufacturing apparatus of a composite resin composition having high mechanical strength.SOLUTION: A manufacturing apparatus 10, which is a manufacturing apparatus for kneading a raw material containing a fibrous filler and a thermoplastic resin to manufacture a composite resin composition, comprises: a first rotor 12a rotating toward a central axis; a second rotor 12b arranged parallel to the first rotor and constituting a kneader which, by rotation toward the central axis, kneads a raw material in pair with the first rotor; a first temperature control part 19a for temperature control of the first rotor; a second temperature control part 19b for temperature control of the second rotor; a first cooling part 18a which sandwiches the central axis of the first rotor and cools a position opposed to the kneader; and a second cooling part 18b which sandwiches the central axis of the second rotor and cools a position opposed to the kneader.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a production apparatus and a production method for a composite resin composition, and particularly relates to a production apparatus and a production method for a fibrous filler-containing composite resin composition having excellent mechanical properties.

  So-called “general-purpose plastics” such as polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC) are relatively inexpensive and weigh a fraction of that of metal or ceramics. It is lightweight and has a feature that it is easy to process such as molding. Therefore, general-purpose plastics are used as materials for various daily necessities such as bags, various types of packaging, various types of containers, sheets, and the like, as well as industrial parts such as automobile parts and electrical parts, and daily necessities and miscellaneous goods.

  However, general-purpose plastics have drawbacks such as insufficient mechanical strength. Therefore, general-purpose plastics do not have sufficient characteristics required for materials used in various industrial products such as machinery products such as automobiles and electrical, electronic, and information products. The current situation is limited.

On the other hand, so-called “engineering plastics” such as polyacetal (POM), polyamide (PA), polycarbonate (PC), and fluororesin are excellent in mechanical properties, and are suitable for machine products such as automobiles and electrical / electronic / information products. Used in various industrial products such as
However, engineered plastics are expensive, have a problem that monomer recycling is difficult, and environmental burden is large.

  Therefore, there is a demand for greatly improving the material properties (such as mechanical strength) of general-purpose plastics. As a method for improving the material properties of general-purpose plastics, a technique for producing a composite resin by blending two or more kinds of additives such as resins or fillers is known. In particular, natural fibers, glass fibers, carbon fibers, and the like, which are fibrous fillers, are used for the purpose of improving mechanical strength. Among them, organic fibrous fillers such as cellulose are recently attracting attention as reinforcing fibers because they are inexpensive and have excellent environmental properties when discarded.

  However, uniform dispersion of the fibrous filler is required in order to sufficiently function the mechanical strength improvement effect by the addition of the fibrous filler. Fibrous fillers tend to aggregate together and are difficult to disperse uniformly. In particular, when an aggregate having a large size is present, cracks are generated starting from the aggregate and are easily broken, so that the impact strength is reduced. In addition, by aggregating, the effect of improving the elastic modulus by the fibrous filler is not sufficiently exhibited. Therefore, it is important to uniformly disperse the fibrous filler in the production of the composite resin. Patent document 1 is mentioned as a manufacturing method which disperse | distributes a raw material by kneading.

JP 2011-184520 A

  However, in the production method described in Patent Document 1, the resin material is continuously heated at a constant temperature during kneading, so that the high temperature is maintained, the viscosity of the composite resin is reduced, the shear is not strong, and the raw material is dispersed. Since the property is low, there is a problem that the strength of the composite resin is lowered. Further, there is a problem that the raw material is deteriorated (for example, a decrease in molecular weight, coloring, etc.) by maintaining the raw material at a high temperature while being kneaded.

  This invention solves the said conventional subject, and it aims at providing the manufacturing apparatus of the composite resin composition with high mechanical strength.

An apparatus for producing a composite resin composition according to the present invention is a production apparatus for producing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin,
A first rotating body that rotates about a central axis;
A second rotating body that is arranged in parallel with the first rotating body and that constitutes a kneading part that kneads the raw material in pairs with the first rotating body by rotating with respect to a central axis; ,
A first temperature control unit for controlling the temperature of the first rotating body;
A second temperature control unit for controlling the temperature of the second rotating body;
A first cooling section that cools a position facing the kneading section across the central axis of the first rotating body;
A second cooling unit that cools a position facing the kneading unit across the central axis of the second rotating body;
Is provided.

A method for producing a composite resin composition according to the present invention is a method for producing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin,
The temperature of the first rotating body and the temperature of the second rotating body that is arranged in parallel with the first rotating body and constitutes a kneading part that kneads the raw materials in pairs with the first rotating body. And control
Cooling a position facing the kneading part across the central axis of the first rotating body and a position facing the kneading part across the central axis of the second rotating body;
Rotating the first rotating body and the second rotating body;
The raw material is kneaded by the kneading unit.

  According to the composite resin composition production apparatus and production method of the present invention, it is possible to apply a stronger shearing force to the raw material compared to the conventional method of constantly heating and kneading, and uniformly adding additives such as fillers in the resin. Can be dispersed. Therefore, it is possible to produce a composite resin composition having high mechanical strength in which the effects of additives such as fillers are sufficiently exhibited.

1 is a schematic plan view showing the configuration of a composite resin composition manufacturing apparatus according to Embodiment 1. FIG. It is the schematic sectional drawing seen from the aa direction of Drawing 1A. FIG. 6 is a schematic side view of another example manufacturing apparatus (biaxial kneader) according to Embodiment 1. It is a top view (plan view) of the kneading part which omitted a barrel about the manufacturing device of Drawing 2A. It is sectional drawing seen from the bb direction of FIG. 2A. In the kneading method concerning Embodiment 1, it is a figure of the time-dependent change of the temperature at the time of kneading | mixing using the kneading apparatus which has a structure where heating and cooling occur periodically. In the kneading method concerning Embodiment 1, it is the figure which showed the time-dependent change of the viscosity at the time of kneading | mixing using the kneading apparatus which has a structure where heating and cooling generate | occur | produce periodically. It is the figure which showed the time-dependent change of the temperature at the time of knead | mixing by the conventional method using the kneading apparatus with which heating is always performed. It is the figure which showed the time-dependent change of the viscosity at the time of knead | mixing by the conventional method using the kneading apparatus with which heating is always performed. In the cross-sectional view of the kneading part in the first embodiment, it is an enlarged schematic view in which the opposing parts of two rotating bodies are locally enlarged. It is an expansion schematic diagram which shows the movement of the fibrous filler by the convection of resin. It is an expansion schematic diagram which shows the state of the fibrous filler before kneading | mixing. It is an expansion schematic diagram which shows the state of the fibrous filler in kneading | mixing. It is an expansion schematic diagram which shows the state of the fibrous filler after kneading | mixing. It is a figure which shows the table | surface which put together the measurement result in each Examples 1-4 and each comparative examples 1-12.

A production apparatus for a composite resin composition according to a first aspect is a production apparatus for producing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin,
A first rotating body that rotates about a central axis;
A second rotating body that is arranged in parallel with the first rotating body and that constitutes a kneading part that kneads the raw material in pairs with the first rotating body by rotating with respect to a central axis; ,
A first temperature control unit for controlling the temperature of the first rotating body;
A second temperature control unit for controlling the temperature of the second rotating body;
A first cooling section that cools a position facing the kneading section across the central axis of the first rotating body;
A second cooling unit that cools a position facing the kneading unit across the central axis of the second rotating body;
Is provided.

The composite resin composition manufacturing apparatus according to a second aspect is the first aspect, wherein the first rotating body and the second rotating body are the first rotating body and the second rotating body. A screw shape that moves the raw material from the raw material supply unit to the composite resin discharge unit along a direction parallel to the central axis of
The first temperature control unit controls the temperature of a third temperature control unit that controls the temperature of the raw material supply unit of the first rotating body and the temperature of the composite resin discharge unit of the first rotating body. A fourth temperature control unit,
The second temperature control unit controls the temperature of the fifth temperature control unit that controls the temperature of the raw material supply unit of the second rotating body and the temperature of the composite resin discharge unit of the second rotating body. And a sixth temperature control unit.

  In the composite resin composition manufacturing apparatus according to the third aspect, in the first aspect, the first rotating body and the second rotating body each have a convex portion and a concave portion on the surface of the rotating body. May be.

  The composite resin composition manufacturing apparatus according to a fourth aspect is the above third aspect, wherein the difference between the distance from the central axis of the apex of the convex portion and the distance from the central axis of the bottom surface of the concave portion is the first aspect. It may be 0.05% or more and 14% or less with respect to the respective diameters of one rotating body and the second rotating body.

A method for producing a composite resin composition according to a fifth aspect is a production method for producing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin,
The temperature of the first rotating body and the temperature of the second rotating body that is arranged in parallel with the first rotating body and constitutes a kneading part that kneads the raw materials in pairs with the first rotating body. And control
Cooling a position facing the kneading part across the central axis of the first rotating body and a position facing the kneading part across the central axis of the second rotating body;
Rotating the first rotating body and the second rotating body;
The raw material is kneaded by the kneading unit.

  The manufacturing method of the composite resin composition according to the sixth aspect is the center axis of the first rotating body in the fifth aspect, so that the temperature difference with the kneading part is 5 ° C to 80 ° C. You may cool the position which opposes the said kneading part on both sides, and the position which opposes the said kneading part on both sides of the center axis | shaft of a said 2nd rotary body.

  The manufacturing method of the composite resin composition according to the seventh aspect is the above fifth aspect, wherein the temperature difference between the first rotating body and the second rotating body is at a position corresponding to the kneading part. You may control the temperature of a said 1st rotary body, and the temperature of a said 2nd rotary body so that it may become 5 to 100 degreeC.

The composite resin composition manufacturing method according to an eighth aspect is the fifth aspect, wherein the first rotating body and the second rotating body are the first rotating body and the second rotating body. Having a screw shape that moves the raw material from the raw material input part to the composite resin discharge part along a direction parallel to the central axis of
At a position corresponding to the kneading part, the temperature of the first rotating body and the first value are set so that the temperature of the raw material charging part is higher than the temperature of the composite resin discharging part in a range of 5 ° C. or more and 100 ° C. or less. The temperature of the second rotating body may be controlled.

  The method for producing a composite resin composition according to a ninth aspect is the method according to any one of the fifth to eighth aspects, wherein the rotational speed difference is not less than 5% and not more than 80%. You may rotate a said 2nd rotary body.

  Hereinafter, the manufacturing apparatus and manufacturing method of the composite resin composition according to the embodiment will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals, and description thereof is omitted as appropriate.

(Embodiment 1)
FIG. 1A is a schematic plan view showing a configuration of a composite resin composition manufacturing apparatus (roll kneader) 10 according to Embodiment 1. FIG. FIG. 1B is a schematic cross-sectional view seen from the aa direction of FIG. 1A. 2A is a side view of another example of the composite resin composition manufacturing apparatus (biaxial kneader) 10a according to Embodiment 1. FIG. FIG. 2B is a top view (plan view) of the kneading unit 20 with the barrel omitted in the manufacturing apparatus of FIG. 2A. FIG. 2C is a cross-sectional view seen from the bb direction of FIG. 2A. Here, the kneading part 20 refers to a part where the raw materials are dispersed and mixed. For convenience, in the drawings, the central axis direction of the rotating bodies 12, 12a, 12b constituting the manufacturing apparatuses 10, 10a is the x direction, the vertically upward direction is the z direction, and the arrangement direction of the two rotating bodies 12a, 12b is the same. -Y direction.

  As the production apparatuses 10 and 10a in Embodiment 1, the twin-screw kneader, kneader, Banbury mixer, extruder shown in FIGS. 1A and 1B, the roll kneader shown in FIGS. 2A to 2C, and the like can be used. Among these, it is more preferable to use a twin-screw kneader or a roll kneader. In the following context, the rotating body of the twin-screw kneader is treated as a screw, and the rotating body of the roll kneader is treated as a roll. In addition, the manufacturing apparatuses 10 and 10a should just have a rotary body as a kneading means, and are not limited to said apparatus.

  The manufacturing apparatus 10 shown in FIGS. 1A and 1B is a roll kneader. As shown in FIG. 1A, the manufacturing apparatus 10 is provided with two roll-shaped rotating bodies 12a and 12b facing each other. Specifically, a rotating body 12a that rotates with respect to the center axis 2a and a rotating body 12b that is arranged in parallel with the rotating body 12a and rotates with respect to the center axis 2b are provided. The two rotary bodies 12a and 12b form a kneading unit 20 that kneads the raw materials.

  In addition, the composite resin composition manufacturing apparatus 10 sandwiches the first cooling unit 18a that sandwiches the central axis 2a of the rotating body 12a and cools the position facing the kneading unit 20, and the central axis 2b of the rotating body 12b. And a second cooling unit 18b that cools the position facing the kneading unit 20. Moreover, the 1st temperature control part 19a which controls the temperature of the rotary body 12a, and the 2nd temperature control part 19b which controls the temperature of the rotary body 12b are provided. Furthermore, the first temperature control unit 19a includes a third temperature control unit 29a that controls the temperature on the upstream side of the rotating body 12a, and a fourth temperature control unit 29b that controls the temperature on the downstream side. Also good. The second temperature control unit 19b includes a fifth temperature control unit 29c that controls the temperature on the upstream side of the rotating body 12b, and a sixth temperature control unit 29d that controls the temperature on the downstream side. Also good.

  The manufacturing apparatus 10a shown in FIGS. 2A to 2C is a twin-screw kneader. As shown in FIG. 2A, the manufacturing apparatus 10a includes a hopper 14 for charging raw materials, a raw material supply section 16 for guiding the raw materials input from the hopper 14 to the kneading section of the manufacturing apparatus 10a, and the kneading section 2 A rotating body 12 of the book and a barrel 11 covering the rotating body 12.

  As shown in FIG. 1A, FIG. 1B, and FIG. 2B, the kneading part 20 of the manufacturing apparatuses 10 and 10a is comprised between the two rotary bodies 12a and 12b arrange | positioned in parallel with each other. Each of the rotating bodies 12a and 12b includes center shafts 2a and 2b extending in the x direction, and kneading disks 3a and 3b provided around the center shafts 2a and 2b. Furthermore, the rotating bodies 12a and 12b are provided with fine convex portions 13A and concave portions 13B on the surfaces of the rotating bodies 12a and 12b themselves, not the kneading disks. The center shafts 2a and 2b are rotated by a motor (not shown). The two rotating bodies 12a and 12b may be rotated in the same direction or in different directions. The kneading disks 3a and 3b may be helical screws along the central axis direction. As a result, the raw materials are conveyed while being kneaded in the direction of the rotation axis (x direction) with the rotation of the rotating bodies 12a and 12b. In the manufacturing apparatus 10a, the convex portions 13A and the concave portions 13B on the surfaces of the two rotating bodies 12a and 12b arranged in parallel to each other in the y direction face each other via the kneading portion 20. Further, as shown in FIG. 2B, a portion where the raw material is supplied to the rotators 12 a and 12 b in the rotation axis direction (x direction) of the two rotators 12 a and 12 b is defined as a raw material supply unit 16. Further, a portion where the composite resin composition of the rotating bodies 12 a and 12 b is discharged is defined as a composite resin discharge portion 17.

  The composite resin composition manufacturing apparatus 10a includes a first cooling unit 18a that cools a position opposed to the kneading unit 20 with the central axis 2a of the rotating body 12a interposed therebetween, and a kneading operation that sandwiches the central axis 2b of the rotating body 12b. 2nd cooling part 18b which cools the position which counters part 20 is provided. Although not shown in FIG. 2B, a first temperature control unit that controls the temperature of the rotating body 12a and a second temperature control unit that controls the temperature of the rotating body 12b are provided as in FIG. 1A. Prepare.

  In the first embodiment, the temperatures of the two rotating bodies 12a and 12b may be decreased as they proceed from the raw material supply direction to the discharge direction. The two rotating bodies 12a and 12b may have a heating unit. Further, in order to uniformly disperse additives such as fibrous fillers, it is preferable that the resin during kneading is in a molten state. Therefore, in the raw material supply unit 16 in the first half of the kneading, in order to quickly change the state of the resin in the solid state to the molten state, it is necessary that the temperature be higher than the softening temperature (melting point) of the resin. By making the resin into a molten state, the resin has fluidity, functions as a solvent, and the uniform dispersion of the additive proceeds. If the resin is not in a molten state and remains in a solid state, the solvent does not have fluidity, so that the raw material does not disperse. Therefore, the raw material supply unit 16 is required to be the hottest among the kneading units 20. On the other hand, in the composite resin discharge part 17 in the latter half of the kneading, it is desirable that the resin has a high viscosity and a strong shear stress is applied, so that the temperature is preferably lower than that of the raw material supply part 16. The composite resin discharge unit 17 preferably has a lower temperature than the raw material supply unit 16 in order to smoothly discharge the composite resin composition. When the temperature is too high, the composite resin composition sticks to the rotating bodies 12a and 12b, so that smooth discharge cannot be performed. When the temperature is too low, the composite resin composition adheres to the surfaces of the rotating bodies 12a and 12b, and therefore cannot be discharged. Therefore, it is preferable that the temperature of the composite resin discharge unit 17 that is the lowest temperature has a temperature difference of 5 ° C. or more and 100 ° C. or less compared to the temperature of the raw material supply unit 16 that is the highest temperature of the rotators 12a and 12b. Further, depending on the raw material, the temperature difference between the raw material supply unit 16 and the composite resin discharge unit 17 is more preferably 20 ° C. or higher and 100 ° C. or lower.

  In Embodiment 1, there may be a temperature difference between the two rotating bodies 12a and 12b. For example, when the temperature of the rotator 12a is higher than the temperature of the rotator 12b, the rotator 12b functions as a cooling unit during kneading and can prevent an increase in the temperature of the resin due to shearing heat generation. For example, as shown in FIG. 1A, the temperature of the rotating body 12a may be made higher than the temperature of the rotating body 12b by the first temperature control unit 19a and the second temperature control unit 19b. In the following context, the rotating body 12a is treated as having a higher temperature than the rotating body 12b. Further, due to the temperature difference between the rotating bodies 12a and 12b, convection occurs in the resin, and the dispersion of the raw materials and the defibration of the fibrous filler proceed. In order to increase the temperature difference between the rotating bodies, it is necessary to extremely increase the temperature of the rotating body 12a, extremely decrease the temperature of the rotating body 12b, or both. On the other hand, a problem may arise when the temperature difference between the rotating bodies 12a and 12b is extremely large. When the temperature is extremely high, since the raw material is maintained at a high temperature, the raw material is deteriorated (decrease in molecular weight, coloring, etc.). On the other hand, when the temperature is extremely lowered, the resin is fixed on the surface of the rotating body 12b, and the kneading cannot be performed well. Therefore, specifically, the temperature difference between the two rotating bodies 12a and 12b is preferably 5 ° C. or more and 100 ° C. or less, and depending on the raw material, the temperature difference is 5 ° C. or more and 90 ° C. or less. Is more preferable.

  Therefore, the manufacturing apparatuses 10 and 10a include the third temperature control unit 29a, the fourth temperature control unit 29b, the fifth temperature control unit 29c, and the sixth temperature control unit in the central axis direction of the two rotating bodies 12a and 12b. You may have the temperature control part 29d.

  3A to 3D are diagrams showing changes in temperature and viscosity over time when the composite resin composition is kneaded. FIG. 3A is a diagram showing a change with time in temperature when kneading is performed using a kneading apparatus having a structure in which heating and cooling occur periodically in the kneading method according to Embodiment 1. FIG. 3B is a diagram showing a change in viscosity with time in the kneading method according to Embodiment 1 when kneading is performed using a kneading apparatus having a structure in which heating and cooling occur periodically. FIG. 3C is a diagram showing a change in temperature over time when kneaded by a conventional method using a kneading apparatus that is constantly heated. FIG. 3D is a diagram showing a change in viscosity over time when kneaded by a conventional method using a kneading apparatus that is constantly heated.

  In the first embodiment, there may be a temperature difference between the kneading part of the manufacturing apparatus 10a and the resin at other locations. As shown in FIGS. 3A and 3B, in the method for producing a composite resin composition in Embodiment 1, cooling and heating periodically occur during kneading, so the temperature of the composite resin composition decreases in the cooling section, Viscosity increases. When the composite resin composition has a high viscosity due to cooling, a large shear stress is applied to the composite resin composition when the composite resin composition is kneaded in the kneading unit 20, and the dispersion of the raw materials and the defibration of the fibrous filler proceed. Therefore, in the method for producing a composite resin composition of the present embodiment, a composite resin composition having high mechanical strength in which raw materials are uniformly dispersed can be produced. In order to increase the temperature difference, it is necessary to extremely increase the temperature of one rotating body 12a, or extremely decrease the temperature of the other rotating body 12b, or both. On the other hand, when the temperature difference is extremely large, a problem may occur. When the temperature of the rotator 12a is extremely high, the raw material may be deteriorated due to a high temperature (decrease in molecular weight, coloring, etc.), and only a low shear stress is applied due to a decrease in viscosity, and the raw material may not be uniformly dispersed. When the temperature of the rotator 12b is extremely low, the temperature is too low, so the resin that has been solidified by the rotator 12b cannot be changed to a molten state by the heating unit, resulting in a solid rather than kneading. As a result, the composite resin composition cannot be produced. Therefore, specifically, the temperature difference between the resin of the rotating body 12a and the rotating body 12b in the kneading part is preferably 5 ° C. or more and 80 ° C. or less, and more preferably 10 ° C. or more and 80 ° C. or less depending on the raw materials. preferable.

  On the other hand, as shown in FIG. 3B, in the conventional manufacturing method, since the heating is always performed, the temperature of the composite resin composition is maintained at a high temperature and the viscosity is lowered, so that the shear stress is sufficiently increased. Therefore, a composite resin composition is produced in which raw materials are not uniformly dispersed, exist as aggregates, and have low properties such as mechanical strength.

  Further, the deterioration of raw materials (decrease in molecular weight, coloring, etc.) proceeds by maintaining a high temperature for a long time rather than instantaneously increasing the temperature. Therefore, it is possible to suppress deterioration of raw materials by using the manufacturing method according to the first embodiment in which cooling and heating periodically occur with respect to rotation around the rotation axis.

  As a specific structure of the kneading apparatus, for example, a twin-screw kneader having a pipe through which cooling water is passed to the outer peripheral portion of the barrel of the twin-screw kneader and a roll in which a blower is attached so that the wind is locally applied to the roll A kneader is mentioned. The pipe | tube which passes the cooling water provided in the outer peripheral part of the said barrel, and the air blower which applies a wind locally respond | corresponds to the above-mentioned cooling part.

  4A to 4E are views in which the opposed portions 22 of the two rotating bodies 12a and 12b are locally enlarged in the cross-sectional views of the kneading unit 20 of FIGS. 1B and 2C. FIG. 4A is an enlarged schematic diagram showing a configuration of surfaces facing each other across the kneading portion 20 of the rotating bodies 12a and 12b having fine irregularities 13A and 13B. FIG. 4B is an enlarged schematic diagram illustrating movement of the fibrous filler 26 due to convection of the resin 24. 4C to 4E show changes with time in the state of the fibrous filler 26 during kneading, and FIG. 4C is an enlarged schematic diagram showing the state of the fibrous filler 26 before kneading. FIG. 4D is an enlarged schematic view showing the state of the fibrous filler 26 during kneading. FIG. 4E is an enlarged schematic view showing the state of the fibrous filler 26 after kneading.

  As shown in FIGS. 4A to 4E, the rotating bodies 12a and 12b preferably have fine irregularities 13A and 13B on the surface. Due to the presence of the irregularities 13A and 13B, the clearance between the rotating bodies 12a and 12b continuously changes when the rotating bodies 12a and 12b rotate. As a result, the fibrous filler 26 is not always subjected to a substantially constant shear stress, the shear stress decreases when the clearance is wide, and the shear stress increases when the clearance is narrow. When the clearance becomes narrow, the tip of the fibrous filler 26 is defibrated due to the shear stress, but the fibrous filler is pressed by the shear stress and the defibration is difficult to proceed further. However, when the clearance changes from a narrow state to a wide state, the defibrated tip expands as the shear stress is relaxed, and when the clearance changes from a wide state to a narrow state, a strong shear stress is applied, The crack at the tip spreads. Defibration effectively proceeds by repeating the wide and narrow changes in the clearance. Further, by having fine irregularities, convection is effectively generated and the raw materials are also dispersed. On the other hand, when using a rotating body having irregularities, if the clearance is too wide, sufficient shear stress is not applied, and defibration and dispersion will not proceed. Therefore, specifically, an appropriate range of unevenness on the surface of the rotating body is calculated by simulation. For example, when the distance between the apex of the convex portion 13A and the bottom surface of the concave portion 13B, that is, the distance from the point of the concave portion 13B farthest from the apex of the convex portion 13A is defined as the depth of the concave portion, It is preferable to have a recess having a depth of 0.05% to 14% with respect to the diameter. Furthermore, it is preferable to have a recess having a depth of 0.1% to 14% depending on the raw material.

  On the other hand, when using a rotating body that does not have irregularities on the surface, since the pressure of almost constant strength continues to be applied microscopically, the fibrous filler can easily maintain a constant shape by pressure, Defibration is difficult to progress.

  In the first embodiment, it is preferable that the two rotating bodies 12a and 12b have a speed difference. At that time, it is desirable that the rotating body 12a, which has a higher temperature than the rotating body 12b, be faster than the rotating body 12b. When the rotator 12a is at a higher temperature than the rotator 12b, the composite resin composition continues to adhere to the rotator 12b, which facilitates the discharge and recovery of the composite resin composition. In addition, since the two rotating bodies 12a and 12b have a speed difference, the facing surface between the rotating bodies 12a and 12b always changes, and the clearance of the narrowest portion changes. Defibration proceeds efficiently. Specifically, the speed difference between the two rotating bodies 12a and 12b is preferably 5% or more and 80% or less, and the speed difference between the two rotating bodies 12a and 12b is 30% or more and 80% or less. Is more preferable.

  The raw material in Embodiment 1 consists of at least a thermoplastic resin and a fibrous filler. When the affinity between the thermoplastic resin and the fibrous filler is low, a dispersant may be added.

  The weight ratio between the thermoplastic resin and the fibrous filler in Embodiment 1 is preferably in the range of 95%: 5% to 10%: 90%. When the weight ratio of the fibrous filler is less than 5%, the amount of the filler is small, so that improvement of the mechanical properties of the composite resin composition due to the fiber reinforcing effect cannot be expected. When the weight ratio of the fibrous filler is larger than 90%, the amount of the resin is small, so that the composite resin composition cannot be formed. Therefore, the weight ratio between the thermoplastic resin and the fibrous filler is preferably within the above range.

  The resin in the first embodiment is preferably a thermoplastic resin in order to ensure good performance even when heating and cooling are repeated. Thermoplastic resins include olefin resins (including cyclic olefin resins), styrene resins, (meth) acrylic resins, organic acid vinyl ester resins or derivatives thereof, vinyl ether resins, halogen-containing resins, polycarbonate resins. Polyester resins, polyamide resins, thermoplastic polyurethane resins, polysulfone resins (polyethersulfone, polysulfone, etc.), polyphenylene ether resins (2,6-xylenol polymer, etc.), cellulose derivatives (cellulose esters, cellulose Carbamates, cellulose ethers, etc.), silicone resins (polydimethylsiloxane, polymethylphenylsiloxane, etc.), rubbers or elastomers (polybutadiene, polyisoprene and other diene rubbers, styrene Diene copolymers, acrylonitrile - butadiene copolymer, acrylic rubber, urethane rubber, silicone rubber, etc.) and the like. Said resin may be used individually or in combination of 2 or more types. The resin is not limited to the above materials as long as it has thermoplasticity.

  Of these thermoplastic resins, the resin is preferably an olefin resin having a relatively low melting point. Olefin resins include olefin monomer homopolymers, olefin monomer copolymers, and copolymers of olefin monomers and other copolymerizable monomers. It is. Examples of olefinic monomers include chain olefins (such as α-C2-20 olefins such as ethylene, propylene, 1-butene, isobutene, 1-pentene, 4-methyl-1-pentene, and 1-octene). And cyclic olefins. These olefinic monomers may be used alone or in combination of two or more. Of the olefin monomers, chain olefins such as ethylene and propylene are preferable. Other copolymerizable monomers include, for example, fatty acid vinyl esters such as vinyl acetate and vinyl propionate; (meth) acrylic monomers such as (meth) acrylic acid, alkyl (meth) acrylate, and glycidyl (meth) acrylate. An unsaturated dicarboxylic acid or anhydride thereof such as maleic acid, fumaric acid, maleic anhydride; vinyl ester of carboxylic acid (eg, vinyl acetate, vinyl propionate, etc.); cyclic olefin such as norbornene, cyclopentadiene; and Examples include dienes such as butadiene and isoprene. These copolymerizable monomers may be used alone or in combination of two or more. Specific examples of the olefin resin include ternary copolymer such as polyethylene (low density, medium density, high density or linear low density polyethylene, etc.), polypropylene, ethylene-propylene copolymer, ethylene-propylene-butene-1. Examples thereof include copolymers of chain olefins such as coalescence (especially α-C2-4 olefins).

  Since the fibrous filler in Embodiment 1 is used for the purpose of improving mechanical properties, the fibrous filler preferably has a higher elastic modulus than the resin. Specifically, carbon fiber (carbon fiber), carbon nanotube, pulp, cellulose, cellulose nanofiber, lignocellulose, lignocellulose nanofiber, basic magnesium sulfate fiber (magnesium oxysulfate fiber), potassium titanate fiber, aluminum borate Fiber, calcium silicate fiber, calcium carbonate fiber, silicon carbide fiber, wollastonite, zonotlite, various metal fibers, natural fiber such as cotton, silk, wool or hemp, regenerated fiber such as jute fiber, rayon or cupra, acetate, Examples thereof include semi-synthetic fibers such as promix, synthetic fibers such as polyester, polyacrylonitrile, polyamide, aramid, and polyolefin, and modified fibers that are chemically modified on the surface and ends thereof. Further, among these, carbons and celluloses are particularly preferable from the viewpoints of availability, high elastic modulus, and low linear expansion coefficient. Furthermore, natural fibers of celluloses are preferable from the viewpoint of environmental properties.

  Examples of the dispersant in the first embodiment include various titanate coupling agents, silane coupling agents, unsaturated carboxylic acids, maleic acid, maleic anhydride, or modified polyolefin grafted with anhydrides thereof, fatty acids, and fatty acid metal salts. And fatty acid esters. The silane coupling agent is preferably an unsaturated hydrocarbon or epoxy type. Even if the surface of the dispersant is treated with a thermosetting or thermoplastic polymer component and modified, there is no problem. The content of the dispersant in the composite resin molded body in the embodiment of the present invention is preferably 0.01% by mass or more and 20% by mass or less, and preferably 0.1% by mass or more and 10% by mass or less. Is more preferably 0.5% by mass or more and 5% by mass or less. If the content of the dispersant is less than 0.01% by mass, poor dispersion may occur. On the other hand, when the content of the dispersant exceeds 20% by mass, the strength of the composite resin molded body may be reduced. The dispersant is appropriately selected depending on the combination of the resin and the fibrous filler, and may not be added in the case of a combination that does not require the dispersant.

  In Embodiment 1, an example in which a roll kneader (FIGS. 1A and 1B) and a twin screw kneader (FIGS. 2A to 2C) are used as the manufacturing apparatus has been described. Not only the machine but also other kneaders may be used.

Example 1
A cellulose fiber-containing composite resin molded article was produced by the following production method. As described above, a kneader, a Banbury mixer, an extruder, a roll kneader, or the like can be used for the production apparatus, but a biaxial kneader is used in the examples.

  As a thermoplastic resin, polypropylene (Nippon Polypro Co., Ltd., trade name: BC03B) as a block polymer, softwood pulp (Mitsubishi Paper Co., Ltd., trade name: NBKP Celgar) as a fibrous filler, and maleic anhydride modified as a dispersant Polypropylene (trade name: Yumex, manufactured by Sanyo Chemical Industries, Ltd.) was weighed to a weight ratio of 80: 15: 5 and dry blended.

  The dry blended raw material was supplied to the kneading apparatus at 2 kg / h by a weight feeder. As described above, a twin-screw kneader (JSW TEX30a Co., Ltd.), which has a structure in which a pipe through which cooling water is passed outside the barrel and a structure in which heating and cooling occur periodically, is used as the kneading apparatus. The screw was of a medium shear type. The composite resin composition discharged from the biaxial kneader was hot-cut to produce cellulose fiber-containing composite resin pellets.

  Using the produced cellulose fiber-containing composite resin pellet, a test piece of a composite resin molded body was prepared by an injection molding machine (180AD manufactured by Nippon Steel). The test piece was prepared under the conditions of a resin temperature of 190 ° C., a mold temperature of 60 ° C., an injection speed of 60 mm / s, and a holding pressure of 80 Pa. The pellets were bitten into the screw of the molding machine through the hopper, and the penetration property at that time was measured by the amount of decrease in the pellets per hour, and it was confirmed that the pellets were constant. The shape of the test piece was changed according to the evaluation items described below, and No. 1 size dumbbells were produced for elastic modulus measurement. A 60 mm square flat plate with a thickness of 1.2 mm was prepared for the drop impact test. The obtained cellulose fiber-containing composite resin molded article test piece was evaluated by the following method.

[Evaluation items for composite resin moldings]
(Aspect ratio of non-defibrated part, length ratio of defibrated part)
The obtained cellulose fiber-containing composite resin pellets were immersed in a xylene solvent to dissolve polypropylene, and the remaining pulp fibers were observed for the shape of the fibers by SEM. As a result of measuring about 10 representative fibers, the fiber diameter was in the range of 2 to 10 μm, and the fiber length was in the range of 200 to 1000 μm. Moreover, the aspect ratio (hereinafter, simply referred to as “aspect ratio”) of the part that was not defibrated was about 100 to 200. A defibrated site was found at the end in the fiber length direction, and the defibrated site was about 30-40% of the total fiber length.

(Specific surface area of fibrous filler)
The obtained cellulose fiber-containing composite resin pellets were immersed in a xylene solvent to dissolve the polypropylene, and the specific surface area of the remaining cellulose fibers was measured. The case where the specific surface area was less than 150% compared to the raw material was rated as x, the case where it was 150% or more and less than 200% was evaluated as △, and the case where it was 200% or more was rated as ◯.
In the composite resin molded body of Example 1, the specific surface area of the cellulose fiber was 210%, and the evaluation was “good”.

(Elastic modulus of composite resin molding)
A tensile test was performed using the obtained No. 1 dumbbell-shaped test piece. Here, as a method for evaluating the elastic modulus, a numerical value of less than 1.8 GPa was evaluated as x, a value of 1.8 GPa or more and less than 2.0 GPa was evaluated as Δ, and a value of 2.0 GPa or more was evaluated as ◯.
In the composite resin molded body of Example 1, the elastic modulus of the test piece was 2.3 GPa, and the evaluation was “good”.

(Drop impact strength of composite resin molding)
A drop impact test was performed using the obtained flat plate-shaped test piece. Specifically, a pylon having a weight of 250 g was dropped from a height of 80 cm toward the plate surface of the test piece, and it was confirmed whether or not cracks occurred. As this evaluation method, the case where no crack was confirmed was marked as ◯, the crack was confirmed only on the surface, and the crack length was less than 10 mm as △, and the penetrating crack was confirmed, Or, the crack was 10 mm or more in length.
In the composite resin molded body of Example 1, the test piece was not confirmed to be cracked, and the evaluation was ◯.

(Degree of aggregation of fibrous filler)
Using the obtained flat plate-shaped test piece, the number and size of aggregates of fibrous fillers were observed with an optical microscope. Here, as an evaluation method of the degree of aggregation, 10 or more aggregates having a size of 1000 μm or more in a 10 mm square area are indicated by X, 3 or more and less than 10 aggregates are indicated by Δ, and less than 3 aggregates are indicated by ○. It was.
In the composite resin molding of Example 1, the number of 1000 μm aggregates in the test piece was 1, and the evaluation was “good”.

(Molecular weight)
The molecular weight of the cellulose fiber-containing composite resin pellet was measured. When the molecular weight distribution of the composite resin pellet was larger than 20% compared to the raw material, it was rated as x.
In the composite resin molded body of Example 1, the pellet was evaluated as “good”.

(Colorability of composite resin composition)
The colorability test of the cellulose fiber-containing composite resin pellet was performed. When the yellowness (YI value) of the composite resin pellet was increased as compared with the raw material, it was evaluated as x.
In the composite resin molded body of Example 1, the pellet was evaluated as “good”.

(Example 2)
In Example 2, the temperature difference between the raw material supply unit and the composite resin discharge unit was changed to 80 ° C., and the other conditions were the same as in Example 1 to produce a cellulose fiber-containing composite resin pellet and a molded body. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Example 3)
In Example 3, the temperature difference between the screws was changed to 70 ° C., and other material conditions and process conditions were the same as in Example 1, and a cellulose fiber-containing composite resin pellet and a molded body were produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Example 4)
In Example 4, the flow rate of the cooling water was changed to twice, and the other material conditions and process conditions were the same as in Example 1 to produce a cellulose fiber-containing composite resin pellet and a molded body. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 1)
In Comparative Example 1, the temperature from the raw material supply unit to the composite resin discharge unit was changed to be constant, and the other material conditions and process conditions were the same as in Example 1 except that the cellulose fiber-containing composite resin pellets and the molded body were used. Produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 2)
In Comparative Example 2, the temperature difference between the raw material supply unit and the composite resin discharge unit was changed to 120 degrees, and the other material conditions and process conditions were the same as in Example 1, cellulose fiber-containing composite resin pellets, In addition, a molded body was produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 3)
In Comparative Example 3, the temperature applied to the two screws was changed to be the same, and the other material conditions and process conditions were the same as in Example 1 to produce a cellulose fiber-containing composite resin pellet and a molded body. did. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 4)
In Comparative Example 4, the temperature difference applied to the two screws was changed to 140 ° C., and the other material conditions and process conditions were the same as in Example 1, and the cellulose fiber-containing composite resin pellets and the molded body Was made. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 5)
In Comparative Example 5, the kneading apparatus was changed to a twin-screw kneader (JSW TEX30a Co., Ltd.) that was not improved so that heating and cooling occurred periodically, and the other material conditions and process conditions were described in Example 1. Similarly, a cellulose fiber-containing composite resin pellet and a molded body were produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 6)
In Comparative Example 6, the temperature difference between the heating part and the cooling part was changed to 135 ° C., and the other material conditions and process conditions were the same as in Example 1, and the cellulose fiber-containing composite resin pellets and the molded body Was made. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 7)
In Comparative Example 7, the surface was changed to a screw having no unevenness, and other material conditions and process conditions were produced in the same manner as in Example 1 to produce a cellulose fiber-containing composite resin pellet and a molded body. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 8)
In Comparative Example 8, the surface was changed to a screw having an unevenness of 20% of the major axis of the screw, and the other material conditions and process conditions were the same as in Example 1 for cellulose fiber-containing composite resin pellets. , And molded articles were produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 9)
In Comparative Example 9, the speeds of the two screws were changed to be the same, and the other material conditions and process conditions were the same as in Example 1 to produce cellulose fiber-containing composite resin pellets and molded bodies. . Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 10)
In Comparative Example 10, the difference in speed between the screws was changed to 100%, and other material conditions and process conditions were the same as in Example 1, and a cellulose fiber-containing composite resin pellet and a molded body were produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 11)
In Comparative Example 11, the weight ratio of polypropylene, softwood pulp, and maleic anhydride-modified polypropylene was changed to 98.8: 1: 0.2, and other material conditions and process conditions were the same as in Example 1. A fiber-containing composite resin pellet and a molded body were produced. Regarding the evaluation, the same evaluation as in Example 1 was performed.

(Comparative Example 12)
In Comparative Example 12, the weight ratio of polypropylene, softwood pulp, and maleic anhydride-modified polypropylene was changed to 4: 95: 1, and the other material conditions and process conditions were the same as in Example 1 and the cellulose fiber-containing composite resin. Pellet was made.

  The measurement results in Examples 1 to 4 and Comparative Examples 1 to 12 are shown in the table of FIG.

  As apparent from the table of FIG. 5, in Example 2 in which the temperature difference between the raw material supply unit and the composite resin discharge unit was changed to 80 ° C., a greater shear stress was applied to the composite resin discharge unit than in Example 1. Therefore, the length ratio of the defibrated site was 40-50%, and the number of 1000 μm aggregates was 0. Therefore, no crack was confirmed even when the impact test was performed at 90 cm. Similar results were obtained in Example 3 in which the temperature difference between the two screws was changed to 70 ° C. and Example 4 in which the temperature difference applied to the two screws was changed to 50 ° C. From the above, Examples 2, 3 and 4 were the same as or better than Example 1 in all tests.

  In Comparative Example 1, the temperature from the raw material supply unit to the composite resin discharge unit was changed to be constant. In Comparative Example 1, since the viscosity at the composite resin discharge part is lower than that in Example 1 and the shear stress is weak, the length ratio of the defibrated portion is 10-20%. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In Comparative Example 2, the temperature difference between the raw material supply unit and the composite resin discharge unit was changed to 120 ° C. In Comparative Example 2, since the temperature of the composite resin discharge part was set too low, the resin adhered to the screw and the composite resin composition could not be discharged. When the temperature of the composite resin discharge part was set to the minimum temperature at which the composite resin composition can be formed in order to perform the experiment, it was necessary to raise the temperature of the raw material supply part so that the temperature difference became 120 ° C. In this case, since the temperature was too high, the viscosity of the resin was remarkably reduced and the composite resin composition could not be produced.

  In Comparative Example 3, the temperature applied to the two screws was changed to be the same. In Comparative Example 3, the length ratio of the defibrated portion was 10-20%. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In Comparative Example 4, the temperature difference applied to the two screws was changed to 140 ° C. In Comparative Example 4, since the temperature of the low temperature side screw was set too low, the resin adhered to the low temperature side screw, and the composite resin composition could not be discharged. On the other hand, when the temperature of the low-temperature side screw is set to the minimum temperature at which the composite resin composition can be formed for the experiment, it is necessary to increase the temperature of the high-temperature side roll so that the temperature difference becomes 140 ° C. It was. In this case, since the temperature was too high, the viscosity of the resin was remarkably reduced and the composite resin composition could not be produced.

  In Comparative Example 5, the kneading apparatus was changed to a biaxial kneader (JSW TEX30a Co., Ltd.) that was not improved so that heating and cooling occurred periodically. In Comparative Example 5, due to a decrease in viscosity due to a temperature increase due to shearing heat generation, dispersion of raw materials and fibrillation of the fibrous filler did not proceed, and the length ratio of the defibrated portion became 10-20%. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In Comparative Example 6, the temperature difference between the heating unit and the cooling unit was changed to 135 ° C. In Comparative Example 6, since the temperature of the cooling part was too low, the resin made solid in the cooling part could not be changed to the molten state in the heating part, and as a result, not kneaded but pulverized in the solid state The composite resin composition could not be produced. If the temperature of the cooling section is changed to a temperature at which the resin can be changed to a molten state in the heating section in order to conduct an experiment, and the temperature of the heating section is increased so that the temperature difference is 140 ° C, the temperature of the heating section is reversed. Was too high, the viscosity of the resin was significantly reduced, and a composite resin composition could not be produced.

  In Comparative Example 7, the screw was changed to a screw having no unevenness on the surface. In Comparative Example 7, since the cellulose fibers could not be defibrated in the local region of the screw surface, the length ratio of the defibrated portion was 10-20%. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In the comparative example 8, it changed into the screw which has an unevenness | corrugation of a magnitude | size of 20% with respect to the major axis of a screw on the surface. In Comparative Example 8, since the clearance between the screws was too large, the raw material was not sufficiently subjected to shear stress, and the number of aggregates having a size of 1000 μm or more was 20-30. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In Comparative Example 9, the speeds of the two screws were changed to be the same. In Comparative Example 9, since the change in clearance was small, the dispersion of raw materials and the defibration of the fibrous filler did not proceed, and the length ratio of the defibrated portion became 20-30%. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In Comparative Example 10, the speed difference between the screws was changed to 100%. In Comparative Example 10, the dispersion of the raw materials and the defibration of the fibrous filler did not proceed, and the length ratio of the defibrated portion became 20-30%. For this reason, the impact resistance was lowered, and the results were broken in the drop impact test.

  In Comparative Example 11, the weight ratio of cellulose fibers was reduced. In Comparative Example 11, since the amount of cellulose fiber was small, the viscosity was low, the raw material was not dispersed, and the fibrous filler was not defibrated, and the length ratio of the defibrated portion was 20-30%. Moreover, since the amount of the cellulose fiber was too small, the mechanical properties of the composite resin composition were not improved due to the fiber reinforcement effect, and the elastic modulus decreased to 1.4 GPa.

  In Comparative Example 12, the weight ratio of cellulose fibers was increased. In Comparative Example 12, since the amount of resin was extremely small compared to the amount of cellulose fiber, a composite resin composition could not be formed.

  From the above evaluation, when the temperature difference between the raw material supply part and the composite resin discharge part, the temperature difference applied to the screw, or the temperature difference between the heating part and the cooling part is excessively increased under the process conditions, a composite resin composition is formed. I couldn't. However, in the range specified in each of the above aspects (the range in which the composite resin composition can be formed), the shear stress increases as the temperature difference increases, so that the dispersion of raw materials and the defibration of cellulose fibers are effective. As a result, a sample having a high elastic modulus and high impact resistance could be produced. From the above, the cellulose fibers added in the composite resin composition are defibrated, the ratio of the length of the defibrated portion of the fibers is long, the aspect ratio of the cellulose fibers is large, the size of the aggregate is small, and It was found that the composite resin composition exhibits a high elastic modulus and a high impact resistance by being uniformly dispersed.

The method for producing a composite resin composition according to the present disclosure is a method for producing a composite resin composition in which a raw material containing at least a fibrous filler and a thermoplastic resin is kneaded with a kneading apparatus to produce a composite resin composition. And
The kneading apparatus has two rotating bodies, each rotating body has a rotating shaft, and a convex portion and a recessed portion provided around the rotating shaft, and the two rotating bodies are , Arranged parallel to each other, constituting a kneading part,
The kneading part has a heating facility for heating at least one of the rotating bodies, the surface temperatures of the two rotating bodies are set to different temperatures, and the periphery of the rotating shaft of at least one of the rotating bodies It is characterized by using the said kneading apparatus which produces a heating and cooling within one circumference.

  According to the method for producing a composite resin composition according to the present disclosure, the specific surface area of the fibrous filler after kneading may be increased as compared with that before kneading.

  In the method for producing a composite resin composition according to the present disclosure, a cooling unit is provided on the downstream side along the moving direction of the raw material parallel to the rotation axis of at least one of the rotating bodies, a heating unit is provided on the upstream side, and the heating is performed. The temperature difference between the part and the cooling part may be 5 ° C. or more and 100 ° C. or less.

  In the method for producing a composite resin composition according to the present disclosure, the temperature difference between the two rotating bodies may be 5 ° C. or more and 100 ° C. or less.

  In the method for producing a composite resin composition according to the present disclosure, the resin temperature of the cooling unit may have a temperature difference of 5 ° C. or more and 80 ° C. or less as compared with the heating unit of the kneading apparatus.

  In the manufacturing method of the composite resin composition according to the present disclosure, when the distance between the apex of the convex portion and the vertex farthest from the apex of the convex portion on the bottom surface of the concave portion is defined as the depth of the concave portion, the rotating body Alternatively, a rotating body having a recess having a depth of 0.05% or more and 14% or less with respect to the diameter of the rotating body may be used on the surface of the rotating body.

  In the method for producing a composite resin composition according to the present disclosure, a difference in rotational speed between the two rotating bodies may be 5% or more and 80% or less.

  In the method for producing a composite resin composition according to the present disclosure, the composite resin composition may be produced with a mixing ratio of thermoplastic resin: fibrous filler ranging from 95%: 5% to 10%: 90%.

A kneading apparatus for a composite resin composition according to the present disclosure is a kneading apparatus for a composite resin composition for kneading raw materials including at least a fibrous filler and a thermoplastic resin to produce a composite resin composition,
Two rotating bodies arranged in parallel to each other, each rotating body forming two kneading parts having a rotating shaft, and a convex portion and a concave portion provided around the rotating shaft. A rotating body,
Heating equipment for heating at least one of the rotating bodies to the kneading section;
A temperature controller that controls the surface temperatures of the two rotating bodies to different temperatures;
May be provided.

  In the kneading apparatus for a composite resin composition according to the present disclosure, in the rotating body, the distance between the vertex of the convex portion and the point farthest from the vertex of the convex portion on the bottom surface of the concave portion is defined as the depth of the concave portion. At this time, the rotating body may have a recess having a depth of 0.05% or more and 14% or less with respect to the diameter of the rotating body on the surface of the rotating body.

  In the kneading apparatus for a composite resin composition according to the present disclosure, the difference in rotational speed between the two rotating bodies may be 5% or more and 80% or less.

  It should be noted that the present disclosure includes appropriately combining any of the various embodiments and / or examples described above, and each of the embodiments and / or examples. The effect which an Example has can be show | played.

  The composite resin composition according to the present invention can provide a molded article having better mechanical strength than conventional general-purpose resins. According to the present invention, since the properties of the resin can be improved, it can be used as an alternative to engineering plastics or an alternative to metallic materials. Therefore, the manufacturing cost of various industrial products made of engineering plastics or metals, or household goods can be greatly reduced. Furthermore, it can be used for home appliance casings, building materials, and automobile members.

2a, 2b Central shafts 3a, 3b Kneading disc 10 Manufacturing apparatus 11 Barrel 12 Rotating body 12a Rotating body (first rotating body)
12b Rotating body (second rotating body)
13A Convex part 13B Concave part 14 Hopper 15 Raw material inlet 16 Raw material supply part 17 Composite resin discharge part 18a First cooling part 18b Second cooling part 19a First temperature control part 19b Second temperature control part 20 Kneading part 22 Opposing portion 24 Resin 26 Fibrous filler 29a Third temperature control unit 29b Fourth temperature control unit 29c Fifth temperature control unit 29d Sixth temperature control unit

Claims (9)

A production apparatus for kneading raw materials containing a fibrous filler and a thermoplastic resin to produce a composite resin composition,
A first rotating body that rotates about a central axis;
A second rotating body that is arranged in parallel with the first rotating body and that constitutes a kneading part that kneads the raw material in pairs with the first rotating body by rotating with respect to a central axis; ,
A first temperature control unit for controlling the temperature of the first rotating body;
A second temperature control unit for controlling the temperature of the second rotating body;
A first cooling section that cools a position facing the kneading section across the central axis of the first rotating body;
A second cooling unit that cools a position facing the kneading unit across the central axis of the second rotating body;
An apparatus for producing a composite resin composition. The first rotating body and the second rotating body move the raw material from the raw material supply section to the composite resin discharge section along a direction parallel to the central axis of the first rotating body and the second rotating body. It has a screw shape to move,
The first temperature control unit controls the temperature of a third temperature control unit that controls the temperature of the raw material supply unit of the first rotating body and the temperature of the composite resin discharge unit of the first rotating body. A fourth temperature control unit,
The second temperature control unit controls the temperature of the fifth temperature control unit that controls the temperature of the raw material supply unit of the second rotating body and the temperature of the composite resin discharge unit of the second rotating body. A sixth temperature control unit,
The manufacturing apparatus of the composite resin composition of Claim 1. The first rotating body and the second rotating body have a convex portion and a concave portion on the surface of the rotating body, respectively.
The manufacturing apparatus of the composite resin composition of Claim 1.   The difference between the distance from the central axis of the apex of the convex portion and the distance from the central axis of the bottom surface of the concave portion is 0.05% with respect to the respective diameters of the first rotating body and the second rotating body. The apparatus for producing a composite resin composition according to claim 3, which is 14% or less. A method for producing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin,
The temperature of the first rotating body and the temperature of the second rotating body that is arranged in parallel with the first rotating body and constitutes a kneading part that kneads the raw materials in pairs with the first rotating body. And control
Cooling a position facing the kneading part across the central axis of the first rotating body and a position facing the kneading part across the central axis of the second rotating body;
Rotating the first rotating body and the second rotating body;
The manufacturing method of the composite resin composition which kneads the said raw material by the said kneading part.   The position opposite to the kneading part and the center axis of the second rotating body are sandwiched with the central axis of the first rotating body so that the temperature difference with the kneading section is 5 ° C. to 80 ° C. The manufacturing method of the composite resin composition of Claim 5 which cools the position facing the said kneading part.   At the position corresponding to the kneading part, the temperature of the first rotating body and the first rotating body are set such that the temperature difference between the first rotating body and the second rotating body is 5 ° C. or more and 100 ° C. or less. The manufacturing method of the composite resin composition of Claim 5 which controls the temperature of 2 rotary bodies. The first rotating body and the second rotating body are configured to transfer the raw material from a raw material input section to a composite resin discharge section along a direction parallel to a central axis of the first rotating body and the second rotating body. It has a screw shape to move,
At a position corresponding to the kneading part, the temperature of the first rotating body and the first value are set so that the temperature of the raw material charging part is higher than the temperature of the composite resin discharging part in the range of 5 ° C. The manufacturing method of the composite resin composition of Claim 5 which controls the temperature of 2 rotary bodies.   The composite resin composition according to any one of claims 5 to 8, wherein the first rotating body and the second rotating body are rotated so that a rotation speed difference is 5% or more and 80% or less. Production method.

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