JP7372741B2 - Manufacturing device and method for composite resin composition - Google Patents

Description

The present invention relates to an apparatus and method for producing a composite resin composition, and particularly to an apparatus and method for producing a composite resin composition containing a fibrous filler 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 the weight of metals or ceramics. It has the characteristics of being lightweight and easy to process such as molding. Therefore, general-purpose plastics are used as materials for a variety of daily necessities such as bags, various packaging, various containers, and sheets, 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 properties required for materials used in mechanical products such as automobiles, and various industrial products including electrical, electronic, and information products, and their range of application is limited. The current situation is that it is restricted.

On the other hand, so-called "engineering plastics" such as polyacetal (POM), polyamide (PA), polycarbonate (PC), and fluororesin have excellent mechanical properties and are used in mechanical products such as automobiles, and electrical, electronic, and information products. It is used in various industrial products such as
However, engineering plastics have problems such as being expensive, difficult to recycle monomers, and having a large environmental burden.

Therefore, there is a need to significantly improve the material properties (mechanical strength, etc.) of general-purpose plastics. As a method for improving the material properties of general-purpose plastics, a technique is known in which a composite resin is manufactured by blending two or more types of resins or additives such as fillers. In particular, fibrous fillers such as natural fibers, glass fibers, and carbon fibers are used for the purpose of improving mechanical strength. Among them, organic fibrous fillers such as cellulose have attracted attention in recent years as reinforcing fibers because they are inexpensive and have excellent environmental friendliness during disposal.

However, in order to fully utilize the effect of improving mechanical strength by adding fibrous filler, uniform dispersion of the fibrous filler is required. Fibrous fillers tend to aggregate with each other, making it difficult to uniformly disperse them. In particular, when large-sized aggregates are present, cracks occur starting from the aggregates, making them more likely to break, resulting in a decrease in impact strength. Moreover, due to aggregation, 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 composite resin. An example of a manufacturing method in which raw materials are dispersed by kneading is disclosed in Patent Document 1.

Japanese Patent Application Publication No. 2011-184520

However, in the manufacturing method described in Patent Document 1, the resin material is continuously heated at a constant temperature during kneading, so the high temperature is maintained, the viscosity of the composite resin is reduced, the shear is not applied strongly, and the raw materials are dispersed. Since the strength of the composite resin is low, there is a problem that the strength of the composite resin decreases. There is also the problem that the raw materials are maintained at a high temperature during kneading, resulting in deterioration of the raw materials (for example, reduction in molecular weight, coloration, etc.).

The present invention is intended to solve the above-mentioned conventional problems, and an object of the present invention is to provide an apparatus for producing a composite resin composition with high mechanical strength.

A manufacturing device for a composite resin composition according to the present invention is a manufacturing device for manufacturing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin, and comprising:
a first rotating body that rotates about the central axis;
a second rotating body that is arranged parallel to the first rotating body and constitutes a kneading section that rotates about a central axis to form a pair with the first rotating body and knead the raw materials; ,
a first temperature control section that controls the temperature of the first rotating body;
a second temperature control section that controls 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;
Equipped with

The 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, comprising:
The temperature of a first rotating body, and the temperature of a second rotating body that is arranged parallel to the first rotating body and forms a pair with the first rotating body and constitutes a kneading section that kneads the raw materials. control and
Cooling a position facing the kneading section across the central axis of the first rotating body and a position facing the kneading unit across the central axis of the second rotating body,
rotating the first rotating body and the second rotating body;
The raw materials are kneaded by the kneading section.

According to the manufacturing apparatus and manufacturing method of a composite resin composition according to the present invention, it is possible to apply stronger shear force to the raw materials compared to the conventional method of constantly heating and kneading, and it is possible to uniformly distribute additives such as fillers in the resin. can be dispersed into Therefore, it is possible to produce a composite resin composition with high mechanical strength and the like, in which the effects of additives such as fillers are fully exhibited.

1 is a schematic plan view showing the configuration of an apparatus for manufacturing a composite resin composition according to Embodiment 1. FIG. FIG. 1A is a schematic cross-sectional view taken along the a-a direction in FIG. 1A. FIG. 2 is a schematic side view of another example of the manufacturing device (twin-screw kneader) according to the first embodiment. FIG. 2B is a top view (plan view) of the kneading section of the manufacturing apparatus of FIG. 2A with the barrel omitted. 2A is a sectional view taken along the bb direction in FIG. 2A. FIG. FIG. 3 is a diagram showing changes in temperature over time when kneading is performed using a kneading device having a structure in which heating and cooling occur periodically in the kneading method according to the first embodiment. FIG. 3 is a diagram showing a change in viscosity over time when kneading is performed using a kneading device having a structure in which heating and cooling occur periodically in the kneading method according to the first embodiment. FIG. 3 is a diagram showing changes in temperature over time when kneading is performed by a conventional method using a kneading device that constantly heats. FIG. 2 is a diagram showing changes in viscosity over time when kneading is performed by a conventional method using a kneading device that constantly heats. FIG. 2 is a schematic enlarged view of a locally enlarged opposing portion of two rotating bodies in a cross-sectional view of the kneading section in Embodiment 1; FIG. 2 is an enlarged schematic diagram showing movement of fibrous filler due to convection of resin. It is an enlarged schematic diagram showing the state of a fibrous filler before kneading. It is an enlarged schematic diagram showing the state of the fibrous filler during kneading. It is an enlarged schematic diagram showing the state of the fibrous filler after kneading. FIG. 2 is a diagram showing a table summarizing the measurement results in Examples 1 to 4 and Comparative Examples 1 to 12.

A manufacturing device for a composite resin composition according to a first aspect is a manufacturing device for manufacturing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin, the manufacturing device comprising:
a first rotating body that rotates about the central axis;
a second rotating body that is arranged parallel to the first rotating body and constitutes a kneading section that rotates about a central axis to form a pair with the first rotating body and knead the raw materials; ,
a first temperature control section that controls the temperature of the first rotating body;
a second temperature control section that controls 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;
Equipped with.

In the apparatus for manufacturing a composite resin composition according to a second aspect, in the first aspect, the first rotating body and the second rotating body are arranged so that the first rotating body and the second rotating body has a screw shape that moves 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
The first temperature control section controls the temperature of the raw material supply section of the first rotating body, and the composite resin discharging section of the first rotating body. a fourth temperature control section;
The second temperature control section controls the temperature of the raw material supply section of the second rotating body, and the composite resin discharging section of the second rotating body. A sixth temperature control section may be included.

In the apparatus for manufacturing a composite resin composition according to a 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. It's okay.

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

A method for producing a composite resin composition according to a fifth aspect is a method for producing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin, the method comprising:
The temperature of a first rotating body, and the temperature of a second rotating body that is arranged parallel to the first rotating body and forms a pair with the first rotating body and constitutes a kneading section that kneads the raw materials. control and
Cooling a position facing the kneading section across the central axis of the first rotating body and a position facing the kneading unit across the central axis of the second rotating body,
rotating the first rotating body and the second rotating body;
The raw materials are kneaded by the kneading section.

In the method for producing a composite resin composition according to the sixth aspect, in the fifth aspect, the central axis of the first rotating body is adjusted such that the temperature difference with the kneading section is 5°C to 80°C. A position opposite to the kneading section across the central axis of the second rotating body and a position facing the kneading section across the central axis of the second rotating body may be cooled.

In the method for producing a composite resin composition according to a seventh aspect, in the fifth aspect, a temperature difference between the first rotary body and the second rotary body is provided at a position corresponding to the kneading section. The temperature of the first rotating body and the temperature of the second rotating body may be controlled to be 5° C. or more and 100° C. or less.

In the method for manufacturing a composite resin composition according to an eighth aspect, in the fifth aspect, the first rotating body and the second rotating body are arranged so that the first rotating body and the second rotating body has 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 the
At a position corresponding to the kneading section, the temperature of the first rotating body and the first The temperature of the second rotating body may also be controlled.

The method for producing a composite resin composition according to a ninth aspect is such that, in any one of the fifth to eighth aspects, the first rotating body and The second rotating body may also be rotated.

Hereinafter, an apparatus and method for manufacturing a composite resin composition according to an embodiment will be described with reference to the drawings. In the following description, the same components are given the same reference numerals, and the description is omitted as appropriate.

(Embodiment 1)
FIG. 1A is a schematic plan view showing the configuration of a composite resin composition manufacturing apparatus (roll kneader) 10 according to Embodiment 1. FIG. 1B is a schematic cross-sectional view taken along the a-a direction in FIG. 1A. FIG. 2A is a side view of another example of a composite resin composition manufacturing apparatus (twin-screw kneader) 10a according to Embodiment 1. FIG. 2B is a top view (plan view) of the kneading section 20 of the manufacturing apparatus of FIG. 2A, with the barrel omitted. FIG. 2C is a sectional view taken along the bb direction in FIG. 2A. Here, the kneading section 20 refers to a section where 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 taken as the x direction, the vertically upward direction is taken as the z direction, and the arrangement direction of the two rotating bodies 12a, 12b is shown as - The direction is y.

As the manufacturing apparatuses 10 and 10a in Embodiment 1, a twin-screw kneader, a kneader, a Banbury mixer, an extruder shown in FIGS. 1A and 1B, a 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 a twin-screw kneader will be treated as a screw, and the rotating body of a roll kneading machine will be treated as a roll. Note that the manufacturing apparatuses 10 and 10a only need to have a rotating body as a kneading means, and are not limited to the above-mentioned apparatus.

The manufacturing apparatus 10 shown in FIGS. 1A and 1B is a roll kneader. As shown in FIG. 1A, this manufacturing apparatus 10 is provided with two roll-shaped rotating bodies 12a and 12b facing each other. Specifically, it includes a rotating body 12a that rotates about the central axis 2a, and a rotating body 12b that is arranged parallel to the rotating body 12a and rotates about the central axis 2b. The two rotating bodies 12a and 12b form a pair and constitute a kneading section 20 for kneading raw materials.

In addition, this composite resin composition manufacturing apparatus 10 includes a first cooling section 18a that cools a position facing the kneading section 20 with the central axis 2a of the rotating body 12a in between, and a first cooling section 18a that cools a position facing the kneading section 20 with the central axis 2a of the rotating body 12b in between. A second cooling section 18b that cools a position facing the kneading section 20 is provided. It also includes a first temperature control section 19a that controls the temperature of the rotating body 12a, and a second temperature control section 19b that controls the temperature of the rotating body 12b. Furthermore, the first temperature control section 19a includes a third temperature control section 29a that controls the temperature on the upstream side of the rotating body 12a, and a fourth temperature control section 29b that controls the temperature on the downstream side. Good too. Further, the second temperature control section 19b includes a fifth temperature control section 29c that controls the temperature on the upstream side of the rotating body 12b, and a sixth temperature control section 29d that controls the temperature on the downstream side. Good too.

The manufacturing apparatus 10a shown in FIGS. 2A to 2C is a twin-screw kneader. As shown in FIG. 2A, this manufacturing apparatus 10a includes a hopper 14 into which raw materials are input, a raw material supply section 16 that guides the raw materials inputted from the hopper 14 to a kneading section of the manufacturing apparatus 10a, and two components that constitute the above-mentioned kneading section. It includes a book rotating body 12 and a barrel 11 that covers the rotating body 12.

As shown in FIGS. 1A, 1B, and 2B, the kneading section 20 of the manufacturing apparatuses 10 and 10a is configured between two rotating bodies 12a and 12b that are arranged parallel to each other. Each rotating body 12a, 12b includes a central axis 2a, 2b extending in the x direction, and a kneading disk 3a, 3b provided around the central axis 2a, 2b. Furthermore, the rotating bodies 12a, 12b are provided with fine protrusions 13A and recesses 13B on the surfaces of the rotating bodies 12a, 12b themselves, not on the kneading disks. The central shafts 2a and 2b are rotated by a motor (not shown). Note that the two rotating bodies 12a and 12b may rotate in the same direction or in different directions. Further, the kneading disks 3a, 3b may be spiral screws extending in the direction of the central axis. As a result, the raw materials are conveyed while being kneaded in the rotation axis direction (x direction) as the rotors 12a and 12b rotate. In this manufacturing apparatus 10a, the convex portions 13A and the concave portions 13B on the surfaces of the two rotating bodies 12a and 12b, which are arranged parallel to each other in the y direction, face each other via the kneading section 20. Further, as shown in FIG. 2B, in the rotation axis direction (x direction) of the two rotating bodies 12a, 12b, a portion where raw materials are supplied to the rotating bodies 12a, 12b is defined as a raw material supply section 16. Further, the portion of the rotating bodies 12a, 12b from which the composite resin composition is discharged is defined as a composite resin discharge portion 17.

This composite resin composition manufacturing apparatus 10a includes a first cooling section 18a that cools a position opposite to the kneading section 20 with the central axis 2a of the rotating body 12a sandwiched therebetween, and a first cooling section 18a that cools a position facing the kneading section 20 with the central axis 2a of the rotating body 12b sandwiched therebetween. A second cooling section 18b that cools a position facing the section 20 is provided. Although not shown in FIG. 2B, a first temperature control section that controls the temperature of the rotating body 12a and a second temperature control section that controls the temperature of the rotating body 12b are provided in the same way as in FIG. 1A. Be prepared.

In the first embodiment, the temperature of the two rotating bodies 12a and 12b may be decreased as the raw material progresses from the supply direction to the discharge direction. The two rotating bodies 12a and 12b may have a heating section. Further, in order to uniformly disperse additives such as fibrous fillers, it is preferable that the resin be in a molten state during kneading. Therefore, in the raw material supply section 16 in the first half of kneading, the temperature needs to be higher than the softening temperature (melting point) of the resin in order to quickly change the state of the resin from a solid state to a molten state. By bringing the resin into a molten state, the resin has fluidity and functions as a solvent, promoting uniform dispersion of additives. If the resin does not become molten and remains solid, the solvent will not have fluidity, and the dispersion of the raw materials will not progress. Therefore, among the kneading sections 20, the raw material supply section 16 is required to have the highest temperature. On the other hand, in the composite resin discharge section 17 in the latter half of kneading, the temperature is preferably lower than that in the raw material supply section 16 because the resin has a high viscosity and it is desirable to apply strong shear stress. Further, the temperature of the composite resin discharge section 17 is preferably lower than that of the raw material supply section 16 in order to smoothly discharge the composite resin composition. If the temperature is too high, the composite resin composition will stick to the rotating bodies 12a, 12b, making it impossible to discharge them smoothly. If the temperature is too low, the composite resin composition will stick to the surfaces of the rotating bodies 12a, 12b and cannot be discharged. Therefore, it is preferable that the temperature of the composite resin discharge section 17, which 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 portion 16, which is the highest temperature of the rotating bodies 12a, 12b. Further, depending on the raw material, the temperature difference between the raw material supply section 16 and the composite resin discharge section 17 is more preferably 20°C or more and 100°C or less.

Further, in the first embodiment, there may be a temperature difference between the two rotating bodies 12a and 12b. For example, when the temperature of the rotating body 12a is higher than the temperature of the rotating body 12b, the rotating body 12b functions as a cooling part during kneading, and can prevent the temperature of the resin from rising due to shear 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 section 19a and the second temperature control section 19b. Note that in the following context, the rotating body 12a will be treated as having a higher temperature than the rotating body 12b. Further, due to the existence of a temperature difference between the rotating bodies 12a and 12b, convection occurs in the resin, and the dispersion of the raw material and the fibrillation of the fibrous filler proceed. In order to increase the temperature difference between the rotating bodies, it is necessary to make the temperature of the rotating body 12a extremely high, to make the temperature of the rotating body 12b extremely low, or to do both. On the other hand, if the temperature difference between the rotating bodies 12a and 12b is extremely large, a problem may occur. When the temperature is extremely high, the raw materials are maintained at a high temperature, resulting in deterioration of the raw materials (reduction in molecular weight, coloration, etc.). On the other hand, if the temperature is extremely low, the resin will stick to the surface of the rotating body 12b, making it impossible to knead properly. Therefore, specifically, it is preferable that the temperature difference between the two rotating bodies 12a and 12b is 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, 10a include a third temperature control section 29a, a fourth temperature control section 29b, a fifth temperature control section 29c, and a sixth temperature control section 29c in the central axis direction of the two rotating bodies 12a, 12b. It may also include a temperature control section 29d.

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

In the first embodiment, there may be a temperature difference between the resin in the kneading section and other parts of the manufacturing apparatus 10a. As shown in FIGS. 3A and 3B, in the method for manufacturing a composite resin composition in Embodiment 1, since cooling and heating occur periodically during kneading, the temperature of the composite resin composition decreases in the cooling section, Viscosity increases. Due to the high viscosity of the composite resin composition due to cooling, a large shear stress is applied to the composite resin composition when it is kneaded in the kneading section 20, and dispersion of the raw material and defibration of the fibrous filler proceed. Therefore, in the method for manufacturing a composite resin composition of the present embodiment, a composite resin composition with high mechanical strength in which the raw materials are uniformly dispersed can be manufactured. In order to increase the temperature difference, it is necessary to make the temperature of one rotating body 12a extremely high, or to make the temperature of the other rotating body 12b extremely low, or both. On the other hand, problems may occur if the temperature difference is extremely large. When the temperature of the rotating body 12a is extremely high, the raw material deteriorates due to the high temperature (reduction in molecular weight, coloration, etc.), and only weak shear stress is applied due to the decrease in viscosity, and the raw material may not be uniformly dispersed. When the temperature of the rotating body 12b is made extremely low, the resin that has been solidified by the rotating body 12b cannot be changed to a molten state in the heating section because the temperature is too low, and as a result, the resin is not kneaded but solidified. As a result, the composite resin composition cannot be produced. Therefore, specifically, it is preferable that the temperature difference between the resin between the rotating body 12a and the rotating body 12b in the kneading section is 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 material. preferable.

On the other hand, as shown in Figure 3B, in the conventional manufacturing method, heating is performed constantly, so the temperature of the composite resin composition is maintained at a high temperature, and the viscosity is reduced, so that the shear stress is sufficiently absorbed. Otherwise, the raw materials are not uniformly dispersed and exist as aggregates, resulting in a composite resin composition with low properties such as mechanical strength.

In addition, deterioration of raw materials (reduction in molecular weight, coloration, etc.) progresses due to the high temperature being maintained for a long period of time, rather than due to instantaneous high temperatures. Therefore, by using the manufacturing method according to the first embodiment in which cooling and heating occur periodically with respect to rotation around the rotation axis, it is also possible to suppress deterioration of the raw material.

The specific structure of the kneading equipment is, for example, a twin-screw kneader with a tube attached to the outer periphery of the barrel for cooling water, and a roll with a blower installed to blow air locally onto the rolls. Examples include kneading machines. The tube for passing cooling water and the blower for applying wind locally, provided on the outer periphery of the barrel, correspond to the above-mentioned cooling section.

4A to 4E are locally enlarged views of the opposing portions 22 of the two rotating bodies 12a and 12b in the cross-sectional views of the kneading section 20 of FIGS. 1B and 2C. FIG. 4A is an enlarged schematic diagram showing the structure of surfaces of rotating bodies 12a and 12b facing each other with the kneading section 20 in between, which have fine irregularities 13A and 13B. FIG. 4B is an enlarged schematic diagram showing movement of the fibrous filler 26 due to convection of the resin 24. 4C to 4E show changes over 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 diagram showing the state of the fibrous filler 26 during kneading. FIG. 4E is an enlarged schematic diagram 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 their surfaces. Due to the presence of the unevenness 13A, 13B, the clearance between the rotating bodies 12a, 12b changes continuously when the rotating bodies 12a, 12b rotate. As a result, a substantially constant shear stress is not applied to the fibrous filler 26 at all times, and when the clearance is wide, the shear stress becomes small, and when the clearance is narrow, the shear stress becomes large. When the clearance becomes narrow, the tip of the fibrous filler 26 is defibrated due to the shear stress, but the fibrous filler is held down by the shear stress, making it difficult for the defibration to proceed any further. However, when the clearance changes from a narrow state to a wide state, the shear stress is relaxed and the defibrated tip spreads, and when the clearance changes from a wide state to a narrow state, a strong shear stress is applied. The crack at the tip is widening. Fibrillation progresses effectively by repeating wide/narrow changes in the clearance. In addition, the presence of fine irregularities effectively generates convection, and the dispersion of raw materials also progresses. On the other hand, when using a rotating body with unevenness, if the clearance is too wide, sufficient shear stress will not be applied, and fibrillation and dispersion will not progress. Therefore, specifically, the 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 of the concave portion 13B, that is, the distance from the apex of the convex portion 13A to the point of the concave portion 13B furthest from the depth of the concave portion, the depth of the concave portion is defined as the depth of the concave portion. It is preferable that the recess has a depth of 0.05% or more and 14% or less of the diameter. Furthermore, depending on the raw material, it is preferable to have a recessed portion having a depth of 0.1% or more and 14% or less.

On the other hand, when a rotating body with no uneven surface is used, the fibrous filler tends to maintain a constant shape due to the pressure because microscopically, a pressure of almost constant strength continues to be applied. Defibration is difficult to proceed.

In the first embodiment, it is preferable that the two rotating bodies 12a and 12b have a speed difference. At this time, it is desirable that the rotating body 12a, which has a higher temperature than the rotating body 12b, is faster than the rotating body 12b. Since the rotating body 12a is at a higher temperature than the rotating body 12b, the composite resin composition continues to adhere to the rotating body 12b, making it easier to discharge and recover the composite resin composition. In addition, because the two rotating bodies 12a and 12b have a speed difference, the facing surfaces between the rotating bodies 12a and 12b constantly change, and the clearance at the narrowest part changes, so that the dispersion of raw materials and the fibrous filler. Defibration proceeds efficiently. Specifically, it is preferable that the speed difference between the two rotating bodies 12a and 12b is 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. Note that if the affinity between the thermoplastic resin and the fibrous filler is low, a dispersant may be added.

The weight ratio of 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 improvement in the mechanical properties of the composite resin composition due to the fiber reinforcing effect cannot be expected. If the weight ratio of the fibrous filler is greater than 90%, the amount of resin is too small to form a composite resin composition. Therefore, the weight ratio of the thermoplastic resin and the fibrous filler is preferably within the above range.

The resin in Embodiment 1 is preferably a thermoplastic resin in order to ensure good performance even when heating and cooling are repeated. Examples of thermoplastic resins include olefin resins (including cyclic olefin resins), styrene resins, (meth)acrylic resins, organic acid vinyl ester resins or their derivatives, vinyl ether resins, halogen-containing resins, and polycarbonate resins. , polyester resins, polyamide resins, thermoplastic polyurethane resins, polysulfone resins (polyethersulfone, polysulfone, etc.), polyphenylene ether resins (2,6-xylenol polymers, etc.), cellulose derivatives (cellulose esters, cellulose) carbamates, cellulose ethers, etc.), silicone resins (polydimethylsiloxane, polymethylphenylsiloxane, etc.), rubbers or elastomers (diene rubbers such as polybutadiene and polyisoprene, styrene-butadiene copolymers, acrylonitrile-butadiene copolymers) , acrylic rubber, urethane rubber, silicone rubber, etc.). The above resins may be used alone or in combination of two or more. Note that the resin is not limited to the above materials as long as it has thermoplasticity.

Among these thermoplastic resins, the resin is preferably an olefin resin having a relatively low melting point. Olefin resins include homopolymers of olefin monomers, copolymers of olefin monomers, and copolymers of olefin monomers and other copolymerizable monomers. It will be done. Examples of olefinic monomers include chain olefins (α-C2-20 olefins such as ethylene, propylene, 1-butene, isobutene, 1-pentene, 4-methyl-1-pentene, and 1-octene). , cyclic olefins, etc. These olefinic monomers may be used alone or in combination of two or more. Among the above olefin monomers, chain olefins such as ethylene and propylene are preferred. Examples of other copolymerizable monomers include 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. unsaturated dicarboxylic acids or their anhydrides such as maleic acid, fumaric acid, and maleic anhydride; vinyl esters of carboxylic acids (e.g., vinyl acetate, vinyl propionate, etc.); cyclic olefins such as norbornene and cyclopentadiene; 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 olefin resins include polyethylene (low density, medium density, high density, linear low density polyethylene, etc.), polypropylene, ethylene-propylene copolymer, ternary copolymer such as ethylene-propylene-butene-1, etc. Examples include copolymers of chain olefins (especially α-C2-4 olefins) such as polymers.

Since the fibrous filler in Embodiment 1 is used for the purpose of improving mechanical properties, it is preferable that the fibrous filler has a higher modulus of elasticity than the resin. Specifically, carbon fiber, carbon nanotube, pulp, cellulose, cellulose nanofiber, lignocellulose, lignocellulose nanofiber, basic magnesium sulfate fiber (magnesium oxysulfate fiber), potassium titanate fiber, aluminum borate. Fibers, calcium silicate fibers, calcium carbonate fibers, silicon carbide fibers, wollastonite, xonotrite, various metal fibers, natural fibers such as cotton, silk, wool or linen, jute fibers, recycled fibers such as rayon or cupro, acetate, Examples include semi-synthetic fibers such as Promix, synthetic fibers such as polyester, polyacrylonitrile, polyamide, aramid, and polyolefin, and modified fibers whose surfaces and ends are chemically modified. Furthermore, among these, carbons and celluloses are particularly preferred from the viewpoint of availability, high elastic modulus, and low coefficient of linear expansion. Furthermore, from the viewpoint of environmental friendliness, natural fibers such as cellulose are preferred.

Dispersants in Embodiment 1 include various titanate coupling agents, silane coupling agents, unsaturated carboxylic acids, maleic acid, maleic anhydride, or modified polyolefins grafted with maleic anhydrides, fatty acids, fatty acid metal salts. , fatty acid esters, etc. The above-mentioned silane coupling agent is preferably an unsaturated hydrocarbon type or an epoxy type. There is no problem even if the surface of the dispersant is modified by being treated with a thermosetting or thermoplastic polymer component. The content of the dispersant in the composite resin molded article 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 preferable, and even 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, if the content of the dispersant exceeds 20% by mass, the strength of the composite resin molded article may decrease. The dispersant is appropriately selected depending on the combination of resin and fibrous filler, and may not be added if the combination does not require a dispersant.

In addition, in Embodiment 1, an example was explained in which a roll kneader (FIGS. 1A and 1B) and a twin-screw kneader (FIGS. 2A to 2C) were used as manufacturing equipment, but a twin-screw kneader and a roll kneader In addition to the kneading machine, other kneading machines may also be used.

(Example 1)
A cellulose fiber-containing composite resin molded body was manufactured by the following manufacturing method. As described above, a kneader, a Banbury mixer, an extruder, a roll kneader, etc. can be used as the manufacturing device, but a twin-screw kneader is used in the examples.

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

The dry blended raw materials were fed to the kneading device at 2 kg/h using a gravimetric feeder. As described above, the kneading device used was a twin-screw kneader (manufactured by JSW TEX30a, Inc.) which had been modified to have a structure in which heating and cooling occur periodically by attaching a pipe for passing cooling water to the outside of the barrel. The screw was of medium shear type. The composite resin composition discharged from the twin-screw kneader was hot-cut to produce cellulose fiber-containing composite resin pellets.

Using the produced cellulose fiber-containing composite resin pellets, test pieces of composite resin molded bodies were produced using an injection molding machine (180AD manufactured by Japan Steel Works). The conditions for producing the test piece were 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 are bitten into the screw of the molding machine via the hopper, and the penetration rate at that time was measured by the amount of pellet reduction per hour, and it was confirmed that it was constant. The shape of the test piece was changed according to the evaluation items described below, and a size 1 dumbbell was prepared for measuring the elastic modulus. In addition, a flat plate of 60 mm square and 1.2 mm thick was prepared for the drop impact test. The obtained cellulose fiber-containing composite resin molded test piece was evaluated by the following method.

[Evaluation items for composite resin molded products]
(Aspect ratio of unfibrillated part, length ratio of defibrated part)
The obtained cellulose fiber-containing composite resin pellets were immersed in a xylene solvent to dissolve the polypropylene, and the shape of the remaining pulp fibers was observed using 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. Further, the aspect ratio of the unfibrillated portion (hereinafter sometimes simply referred to as aspect ratio) was about 100 to 200. A fibrillated area was observed at the end in the fiber length direction, and the fibrillated area was approximately 30 to 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. When the specific surface area was less than 150% compared to the raw material, it was marked as ×, when it was 150% or more and less than 200%, it was marked as Δ, and when it was 200% or more, it was marked as ○.
In the composite resin molded article of Example 1, the specific surface area of the cellulose fibers was 210%, and the evaluation thereof was 0.

(Elastic modulus of composite resin molded body)
A tensile test was conducted using the obtained No. 1 dumbbell-shaped test piece. Here, as a method for evaluating the elastic modulus, a value of less than 1.8 GPa is marked as x, a value of 1.8 GPa or more and less than 2.0 GPa is marked as Δ, and a value of 2.0 GPa or more is marked as ○.
In the composite resin molded article of Example 1, the elastic modulus of the test piece was 2.3 GPa, and the evaluation was ○.

(Drop impact strength of composite resin molded body)
A drop impact test was conducted using the obtained flat plate-shaped test piece. Specifically, a heavy pyramid weighing 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 appeared. As for this evaluation method, cases where no cracks were confirmed were marked as ○, cases where cracks were confirmed only on the surface and the length of the cracks was less than 10 mm were marked as △, and penetrating cracks were confirmed. Alternatively, those in which the length of the crack was 10 mm or more were marked as ×.
In the composite resin molded article of Example 1, no cracks were observed in the test piece, and the evaluation was 0.

(Degree of aggregation of fibrous filler)
Using the obtained flat plate-shaped test piece, the number and size of aggregates of the fibrous filler were observed using an optical microscope. Here, as a method for evaluating the degree of aggregation, if there are 10 or more aggregates with a size of 1000 μm or more in a 10 mm square area, it is marked as ×, when there are 3 or more and less than 10 pieces, it is marked as △, and when there are less than 3 pieces, it is marked as ○. And so.
In the composite resin molded article of Example 1, the number of 1000 μm aggregates in the same test piece was 1, and the evaluation was ◯.

(molecular weight)
The molecular weight of cellulose fiber-containing composite resin pellets was measured. If the molecular weight distribution of the composite resin pellet was greater than 20% compared to the raw material, it was marked as ×, and when it was 20% or less, it was marked as ○.
In the composite resin molded article of Example 1, the pellets were evaluated as ○.

(Colorability of composite resin composition)
A colorability test was conducted on composite resin pellets containing cellulose fibers. If the yellowness (YI value) of the composite resin pellet increased compared to the raw material, it was marked as ×, and if it did not increase, it was marked as ○.
In the composite resin molded article of Example 1, the pellets were evaluated as ○.

(Example 2)
In Example 2, cellulose fiber-containing composite resin pellets and molded bodies were produced in the same manner as in Example 1 except that the temperature difference between the raw material supply section and the composite resin discharge section was changed to 80°C. Evaluations were also conducted in the same manner as in Example 1.

(Example 3)
In Example 3, the temperature difference between the screws was changed to 70° C., 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. Evaluations were also conducted in the same manner as in Example 1.

(Example 4)
In Example 4, the flow rate of cooling water was doubled, and cellulose fiber-containing composite resin pellets and molded bodies were produced in the same manner as in Example 1 except for the other material conditions and process conditions. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 1)
In Comparative Example 1, the temperature from the raw material supply part to the composite resin discharge part was changed to a constant value, and the other material conditions and process conditions were the same as in Example 1, except that cellulose fiber-containing composite resin pellets and molded bodies were Created. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 2)
In Comparative Example 2, the temperature difference between the raw material supply section and the composite resin discharge section was changed to 120 degrees, and other material conditions and process conditions were the same as in Example 1, such as cellulose fiber-containing composite resin pellets, A molded body was also produced. Evaluations were also conducted in the same manner as in Example 1.

(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 cellulose fiber-containing composite resin pellets and molded bodies. did. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 4)
In Comparative Example 4, the temperature difference between the two screws was changed to 140°C, and the other material conditions and process conditions were the same as in Example 1, such as cellulose fiber-containing composite resin pellets and molded bodies. was created. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 5)
In Comparative Example 5, the kneading device was changed to an unimproved twin-screw kneader (JSW TEX30a, Inc.) so that heating and cooling occur periodically, and the other material conditions and process conditions were the same as in Example 1. Cellulose fiber-containing composite resin pellets and molded bodies were produced in the same manner. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 6)
In Comparative Example 6, the temperature difference between the heating section and the cooling section was changed to 135°C, and the other material conditions and process conditions were the same as in Example 1, except that cellulose fiber-containing composite resin pellets and molded bodies were was created. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 7)
In Comparative Example 7, a screw having no irregularities on the surface was used, and cellulose fiber-containing composite resin pellets and molded bodies were produced in the same manner as in Example 1 except for the other material conditions and process conditions. Evaluations were also conducted in the same manner as in Example 1.

(Comparative example 8)
In Comparative Example 8, the screw was changed to a screw having an unevenness of 20% of the major axis of the screw on the surface, and the other material conditions and process conditions were the same as in Example 1, except that cellulose fiber-containing composite resin pellets were used. , and a molded body were produced. Evaluations were also conducted in the same manner as in Example 1.

(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. . Evaluations were also conducted in the same manner as in Example 1.

(Comparative Example 10)
In Comparative Example 10, the speed difference between the screws was changed to 100%, 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. Evaluations were also conducted in the same manner as in Example 1.

(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 the other material conditions and process conditions were the same as in Example 1. Fiber-containing composite resin pellets and molded bodies were produced. Evaluations were also conducted in the same manner as in Example 1.

(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. Pellets were made.

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

As is clear from the table in Figure 5, in Example 2, in which the temperature difference between the raw material supply section and the composite resin discharge section was changed to 80°C, greater shear stress is applied at the composite resin discharge section than in Example 1. Therefore, the length ratio of the defibrated region was 40-50%, and the number of 1000 μm aggregates was 0. Therefore, no cracks were observed even when an impact test was conducted 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 in Example 4, in which the temperature difference between the two screws was changed to 50°C. From the above, Examples 2, 3, and 4 had results equivalent to or better than Example 1 in all tests.

In Comparative Example 1, the temperature from the raw material supply section to the composite resin discharge section was changed to be constant. In Comparative Example 1, the viscosity at the composite resin discharge part was lower than in Example 1, and the shear stress was weaker, so the length ratio of the defibrated part was 10-20%. As a result, the impact resistance decreased, resulting in cracking in the drop impact test.

In Comparative Example 2, the temperature difference between the raw material supply section and the composite resin discharge section was changed to 120°C. In Comparative Example 2, since the temperature of the composite resin discharge section 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 section was set to the minimum temperature at which a composite resin composition could be formed in order to conduct the experiment, it was necessary to raise the temperature of the raw material supply section so that the temperature difference was 120°C. In this case, on the contrary, since the temperature was too high, the viscosity of the resin decreased significantly, making it impossible to produce a composite resin composition.

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%. As a result, the impact resistance decreased, resulting in cracking in the drop impact test.

In Comparative Example 4, the temperature difference between the two screws was changed to 140°C. In Comparative Example 4, the temperature of the screw on the low temperature side was set too low, so the resin stuck to the screw on the low temperature side, making it impossible to discharge the composite resin composition. On the other hand, if the temperature of the screw on the low-temperature side is set to the minimum temperature at which a composite resin composition can be formed in order to conduct an experiment, it is necessary to raise the temperature of the roll on the high-temperature side so that the temperature difference becomes 140°C. Ta. In this case, on the contrary, since the temperature was too high, the viscosity of the resin decreased significantly, making it impossible to produce a composite resin composition.

In Comparative Example 5, the kneading device was changed to a twin-screw kneader (manufactured by JSW TEX30a, Inc.) that had not been improved so that heating and cooling occurred periodically. In Comparative Example 5, dispersion of the raw material and defibration of the fibrous filler did not proceed due to a decrease in viscosity due to a temperature increase due to shear heat generation, and the length ratio of the defibrated portion was 10-20%. As a result, the impact resistance decreased, resulting in cracking in the drop impact test.

In Comparative Example 6, the temperature difference between the heating section and the cooling section was changed to 135°C. In Comparative Example 6, the temperature in the cooling section was set too low, so the resin that had been solidified in the cooling section could not be changed to a molten state in the heating section, and as a result, the resin was pulverized in the solid state rather than kneaded. Therefore, the composite resin composition could not be produced. In order to conduct the experiment, the temperature of the cooling section was changed to a temperature at which the resin could change to a molten state in the heating section, and if the temperature of the heating section was increased so that the temperature difference was 140°C, the temperature of the heating section was too high, and the viscosity of the resin decreased significantly, making it impossible to produce a composite resin composition.

In Comparative Example 7, the screw was changed to a screw with no unevenness on the surface. In Comparative Example 7, the cellulose fibers could not be defibrated in a local area on the screw surface, so the length ratio of the defibrated region was 10-20%. As a result, the impact resistance decreased, resulting in cracking in the drop impact test.

In Comparative Example 8, the screw was changed to a screw having irregularities on the surface having a size of 20% of the major axis of the screw. In Comparative Example 8, the clearance between the screws was too large, so sufficient shear stress was not applied to the raw material, and the number of aggregates with a size of 1000 μm or more was 20-30. As a result, the impact resistance decreased, resulting in cracking 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 there was little change in clearance, dispersion of the raw material and defibration of the fibrous filler did not progress, and the length ratio of the defibrated region was 20-30%. As a result, the impact resistance decreased, resulting in cracking in the drop impact test.

In Comparative Example 10, the speed difference between the screws was changed to 100%. In Comparative Example 10, dispersion of the raw material and defibration of the fibrous filler did not progress, and the length ratio of the defibrated region was 20-30%. As a result, the impact resistance decreased, resulting in cracking 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 fibers was small, the viscosity was low, the dispersion of the raw material and the fibrillation of the fibrous filler did not proceed, and the length ratio of the fibrillated portion was 20-30%. Furthermore, since the amount of cellulose fibers was too small, the mechanical properties of the composite resin composition did not improve due to the fiber reinforcing effect, resulting in a lower elastic modulus of 1.4 GPa.

In Comparative Example 12, the weight ratio of cellulose fibers was increased. In Comparative Example 12, the amount of resin was extremely small compared to the amount of cellulose fibers, so it was not possible to form a composite resin composition.

From the above evaluation, we found that if the temperature difference between the raw material supply section and the composite resin discharge section, the temperature difference applied to the screw, or the temperature difference between the heating section and the cooling section is made too large under the process conditions, the composite resin composition will not be formed. I couldn't do it. However, within the range specified in each of the above embodiments (the range in which a composite resin composition can be formed), the greater the temperature difference, the greater the shear stress, which makes dispersion of raw materials and defibration of cellulose fibers less effective. As a result, we were able to create a sample with high elastic modulus and high impact resistance. From the above, the cellulose fibers added to the composite resin composition are defibrated, the length ratio of the defibrated portion of the fibers is long, the aspect ratio of the cellulose fibers is large, the size of aggregates is small, and It was found that the composite resin composition exhibits high elastic modulus and high impact resistance due to uniform dispersion.

A 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 in a kneading device to produce a composite resin composition. hand,
The kneading device has two rotating bodies, each of the rotating bodies has a rotating shaft, and a convex part and a recessed part provided around the rotating shaft, and the two rotating bodies have , are arranged parallel to each other and constitute a kneading section,
The kneading section includes heating equipment for heating at least one of the rotating bodies, and the surface temperatures of the two rotating bodies are set to different temperatures, and the area around the rotation axis of at least one of the rotating bodies is It is characterized in that the kneading device described above is used in which heating and cooling occur within one round.

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

The method for producing a composite resin composition according to the present disclosure includes providing a cooling section 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, providing a heating section on the upstream side, and The temperature difference between the heating section and the cooling section may be 5° C. or more and 100° C. or less.

In the method for manufacturing 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 manufacturing a composite resin composition according to the present disclosure, the resin temperature in the cooling part may have a temperature difference of 5°C or more and 80°C or less compared to the heating part of the kneading device.

In the method for producing a composite resin composition according to the present disclosure, when the depth of the recess is defined as the distance between the apex of the convex portion and a point on the bottom surface of the recess that is farthest from the apex of the convex portion, Alternatively, a rotating body may be used which has a recess on its surface having a depth of 0.05% or more and 14% or less of the diameter of the rotating body.

In the method for manufacturing a composite resin composition according to the present disclosure, the rotational speed difference 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 at a mixing ratio of thermoplastic resin:fibrous filler in a range of 95%:5% to 10%:90%.

A kneading device for a composite resin composition according to the present disclosure is a kneading device for a composite resin composition that manufactures a composite resin composition by kneading raw materials containing at least a fibrous filler and a thermoplastic resin, the device comprising:
Two rotating bodies arranged parallel to each other, each of the rotating bodies forming a kneading section having a rotating shaft and a convex part and a concave part provided around the rotating shaft. a rotating body,
heating equipment for heating at least one of the rotating bodies in the kneading section;
a temperature control unit that controls the surface temperatures of the two rotating bodies to different temperatures;
may be provided.

In the kneading device for a composite resin composition according to the present disclosure, the rotating body is configured such that the depth of the recess is defined as the distance between the apex of the convex portion and a point on the bottom surface of the recess that is farthest from the apex of the convex portion. In this case, the rotating body may have a recessed portion on the surface of the rotating body having a depth of 0.05% or more and 14% or less with respect to the diameter of the rotating body.

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

Note that the present disclosure includes appropriate combinations of any of the various embodiments and/or examples described above, and includes the combination of the various embodiments and/or examples described above. The effects of the embodiments can be achieved.

The composite resin composition according to the present invention can provide a molded article having better mechanical strength than conventional general-purpose resins. Since the properties of the resin can be improved according to the present invention, it can be used as a substitute for engineering plastics or a substitute for metal materials. Therefore, the manufacturing cost of various industrial products or daily necessities made of engineering plastics or metals can be significantly reduced. Furthermore, it can be used for home appliance cases, building materials, and automobile parts.

2a, 2b Central shafts 3a, 3b Kneading disk 10 Manufacturing device 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 input port 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 section 29b Fourth temperature control section 29c Fifth temperature control section 29d Sixth temperature control section

Claims (5)

A manufacturing device for kneading raw materials containing a fibrous filler and a thermoplastic resin to manufacture a composite resin composition,
a first rotating body that rotates about the central axis;
a second rotating body that is arranged parallel to the first rotating body and constitutes a kneading section that rotates about a central axis to form a pair with the first rotating body and knead the raw materials;
a first temperature control section that controls the temperature of the first rotating body;
a second temperature control section that controls 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 section that cools a position facing the kneading section across the central axis of the second rotating body;
Equipped with
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, and
The difference between the distance of the apex of the convex portion from the central axis and the distance of the bottom surface of the recess from the central axis is 0.05% with respect to the diameter of each of the first rotating body and the second rotating body. 14% or less,
The temperature difference between the raw material supply section on the high temperature side and the composite resin discharge section on the low temperature side, in which the raw material moves along a direction parallel to the central axes of the first rotating body and the second rotating body, is 5° C. or more. The temperature is below 100℃ ,
The temperature of the first rotating body and the temperature of the second rotating body are controlled so that the temperature difference between the first rotating body and the second rotating body is 5° C. or more and 100° C. or less. death,
The kneading process is carried out between a position facing the kneading part across the central axis of the first rotating body and a central axis of the second rotating body so that the temperature difference between the kneading unit and the kneading unit is 5°C to 80°C. cooling the part and the opposite position,
Rotating the first rotating body and the second rotating body such that a rotational speed difference is 5% or more and 80% or less,
Kneading the fibrous filler and the thermoplastic resin at a thermoplastic resin: fibrous filler ratio in the range of 95%:5% to 10%:90%;
Manufacturing equipment for composite resin composition. The first rotating body and the second rotating body transport the raw material from the raw material supply section to the composite resin discharge section along a direction parallel to the central axes of the first rotating body and the second rotating body. It has a screw shape that allows it to move.
The first temperature control section controls the temperature of the raw material supply section of the first rotating body, and the composite resin discharging section of the first rotating body. a fourth temperature control section;
The second temperature control section controls the temperature of the raw material supply section of the second rotating body, and the composite resin discharging section of the second rotating body. a sixth temperature control section;
An apparatus for producing a composite resin composition according to claim 1. A manufacturing method for manufacturing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin, the method comprising:
The temperature of the first rotating body and the temperature of a second rotating body that is arranged parallel to the first rotating body and forms a pair with the first rotating body and constitutes a kneading section that kneads the raw materials. control,
Cooling a position facing the kneading section across the central axis of the first rotating body and a position facing the kneading unit across the central axis of the second rotating body,
rotating the first rotating body and the second rotating body;
Kneading the raw materials by the kneading section,
The kneading process is carried out between a position facing the kneading part across the central axis of the first rotating body and a central axis of the second rotating body so that the temperature difference between the kneading unit and the kneading unit is 5°C to 80°C. cooling the part and the opposite position,
The temperature difference between the raw material supply section on the high temperature side and the composite resin discharge section on the low temperature side, in which the raw material moves along a direction parallel to the central axes of the first rotating body and the second rotating body, is 5° C. or more. The temperature is below 100℃ ,
The temperature of the first rotating body and the temperature of the second rotating body are controlled so that the temperature difference between the first rotating body and the second rotating body is 5° C. or more and 100° C. or less. death,
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, and
The difference between the distance of the apex of the convex portion from the central axis and the distance of the bottom surface of the recess from the central axis is 0.05% with respect to the diameter of each of the first rotating body and the second rotating body. 14% or less,
Rotating the first rotating body and the second rotating body such that a rotational speed difference is 5% or more and 80% or less,
Kneading the fibrous filler and the thermoplastic resin at a thermoplastic resin: fibrous filler ratio in the range of 95%:5% to 10%:90%;
A method for producing a composite resin composition. A manufacturing method for manufacturing a composite resin composition by kneading raw materials containing a fibrous filler and a thermoplastic resin, the method comprising:
The temperature of the first rotating body and the temperature of a second rotating body that is arranged parallel to the first rotating body and forms a pair with the first rotating body and constitutes a kneading section that kneads the raw materials. control,
Cooling a position facing the kneading section across the central axis of the first rotating body and a position facing the kneading unit across the central axis of the second rotating body,
rotating the first rotating body and the second rotating body;
Kneading the raw materials by the kneading section,
Rotating the first rotating body and the second rotating body such that a rotational speed difference is 5% or more and 80% or less,
The temperature difference between the raw material supply section on the high temperature side and the composite resin discharge section on the low temperature side, in which the raw material moves along a direction parallel to the central axes of the first rotating body and the second rotating body, is 5° C. or more. The temperature is below 100℃ ,
The temperature of the first rotating body and the temperature of the second rotating body are controlled so that the temperature difference between the first rotating body and the second rotating body is 5° C. or more and 100° C. or less. death,
The kneading process is carried out between a position facing the kneading part across the central axis of the first rotating body and a central axis of the second rotating body so that the temperature difference between the kneading unit and the kneading unit is 5°C to 80°C. cooling the part and the opposite position,
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, and
The difference between the distance of the apex of the convex portion from the central axis and the distance of the bottom surface of the recess from the central axis is 0.05% with respect to the diameter of each of the first rotating body and the second rotating body. 14% or less,
Kneading the fibrous filler and the thermoplastic resin at a thermoplastic resin: fibrous filler ratio in the range of 95%:5% to 10%:90%;
A method for producing a composite resin composition. The first rotating body and the second rotating body transport the raw material from the raw material input section to the composite resin discharge section along a direction parallel to the central axes of the first rotating body and the second rotating body. It has a screw shape that allows it to move.
At a position corresponding to the kneading section, the temperature of the first rotating body and the first rotating body are adjusted so that the temperature of the raw material input section is higher than the temperature of the composite resin discharge section in the range of 5° C. or more and 100° C. or less. The method for producing a composite resin composition according to claim 3 or 4, wherein the temperature of the rotating body of No. 2 is controlled.

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