JP2010274506A - Rubber material molding, aggregate of the same, and rubber product using them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber material molding that can lighten a load to a kneading apparatus and reduce a failure caused by an overload to the kneading apparatus. <P>SOLUTION: The rubber material molding used for obtaining a rubber composition by kneading the rubber material molding in the sealed kneading apparatus having a plurality of rotors, includes at least a diene-based rubber component and a filler component and has a shape that satisfies expression (1) 0.05Dm≤Gb≤2Dm, expression (2) 0.15Wm≤Wb≤0.95Wm and expression (3) 1.5Rm≤Lb≤32Rm. An aggregate of the rubber material molding, and a rubber product using them are also provided. In the expression (1), Gb is the thickness of the rubber material molding, Dm is a maximum value of a rotor-to-rotor void distance perpendicular to rotary shafts of the rotors on a plane including the rotary shafts of the rotors of the kneading apparatus. In the expression (2), Wb is the width of the rubber material molding, and Wm is the width of a kneading chamber parallel with the rotary shafts of the rotors of the kneading apparatus. In the expression (3), Lb is the length of the rubber material molding, and Rm is the maximum rotor rotation radius of the kneading apparatus. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rubber material molded body, an assembly thereof, and a rubber product using them, particularly a tire, used in a rubber product manufacturing industry.

In the rubber product manufacturing field, various rubber materials are used as main raw materials. As these rubber materials, a rubber-filler composite such as a masterbatch obtained by mixing raw rubber and filler in addition to natural rubber or synthetic rubber is used.
These raw rubbers and masterbatches are usually kneaded with other rubber compounding materials in a closed kneader to produce rubber compositions used for various rubber products.

For example, Patent Documents 1 to 3 describe a method for producing a rubber composition by kneading a rubber material and another rubber compounding material in a closed kneading apparatus.
However, Patent Documents 1 to 3 did not consider reducing the load on the kneading apparatus by devising the shape of a rubber material, particularly a high-viscosity rubber material.

JP 2005-185948 A JP 2005-199503 A JP 2006-116400 A JP 2006-348237 A

  Under such circumstances, an object of the present invention is to provide a molded rubber material that can reduce the load on the kneading apparatus and reduce the failure caused by the overload on the kneading apparatus.

  As a result of intensive studies to achieve the above object, the inventors of the present invention have made a rubber material molded body in which a rubber material, in particular, a high-viscosity rubber material, is matched with the rotor shape and the kneading chamber shape of the closed kneading apparatus. As a result, it has been found that the load on the kneading apparatus can be reduced and the failure caused by the overload on the kneading apparatus can be reduced. The present invention has been completed based on such findings.

That is, the present invention
[1] A rubber material molding used for obtaining a rubber composition by kneading in a closed kneading apparatus having a plurality of rotors, comprising at least a diene rubber component and a filler component, and its shape Satisfies the following formulas (1), (2) and (3):
0.05Dm ≦ Gb ≦ 2Dm (1)
0.15 Wm ≦ Wb ≦ 0.95 Wm (2)
1.5Rm ≦ Lb ≦ 32Rm (3)
[In the formula (1), Gb is the thickness of the molded rubber material, and Dm is the maximum value of the gap distance between the rotors perpendicular to the rotation axis of the rotor on the plane including the rotation axis of the rotor of the kneading apparatus. In Formula (2), Wb is the width of the rubber material molded body, and Wm is the width of the kneading chamber parallel to the rotor rotation axis of the kneading apparatus. In the formula (3), Lb is the length of the rubber material molding, and Rm is the maximum rotor rotation radius of the kneading apparatus. ]
[2] The molded rubber material according to [1], wherein the bulk specific gravity Dv is 0.42 or more,
[3] The molded rubber material according to the above [1] or [2], wherein the Mooney viscosity ML _{1 + 4 at} 130 ° C. is 85 or more, or the Mooney viscosity MS _{1 + 4 at} 130 ° C. is 68 or more.
[4] The diene rubber component comprises natural rubber, butadiene rubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, butyl rubber and halogenated butyl rubber. [1] The above [1], which is at least one rubber selected from the group, and the filler component is at least one selected from the group consisting of carbon black, silica and an inorganic filler represented by the following general formula (4) To [3], a molded rubber material according to any one of
mM ¹ · xSiOy · zH ₂ O (4)
[Wherein M ¹ is a metal selected from the group consisting of aluminum, magnesium, titanium, calcium, and zirconium, an oxide or hydroxide of the metal, a hydrate of the oxide or the hydroxide, and The metal carbonate is at least one selected from the group consisting of carbonates, and m, x, y and z are each an integer of 1 to 5, an integer of 0 to 10, an integer of 2 to 5, and 0 to 10 It is an integer. However, in the above formula (4), when both x and z are 0, the inorganic filler is at least one metal selected from aluminum, magnesium, titanium, calcium and zirconium, metal oxide or metal hydroxide. It becomes a thing. ]
[5] Any one of the above [1] to [4], wherein a wet master batch obtained by mixing and solidifying rubber latex and a filler slurry is dehydrated and dried, and then molded by extrusion and / or roll processing. Rubber material molded body as described,
[6] The molded rubber material according to any one of [1] to [5], wherein the mass is 40 kg or less,
[7] A rubber material molded body aggregate formed by assembling a plurality of rubber material molded bodies according to any one of [1] to [6] above,
[8] The rubber material molded body aggregate according to any one of the above [1] to [7], wherein the bulk specific gravity Dv is 0.42 or more,
[9] The rubber material molded body aggregate according to [7] or [8], wherein the mass is 40 kg or less,
[10] A rubber composition obtained by kneading the rubber material molded body according to any one of the above [1] to [6] and a compounded material for rubber in the closed kneading apparatus,
[11] A rubber product using the rubber composition according to [10], and [12] a tire using the rubber composition according to [10].

  According to the production method of the present invention, it is possible to provide a rubber material molded body that can reduce a load on a kneading apparatus and reduce a failure caused by an overload on the kneading apparatus even if the rubber material has a high viscosity. it can. Furthermore, since the apparent specific gravity can be increased by using a molded body and / or a molded body aggregate, the loading amount is increased and the transportation efficiency is improved. Moreover, since the deformation amount at the time of storage is small and the shape is adjusted, there is an effect that it is easy to handle during use.

It is a schematic diagram which shows the dimension display method of Gb, Wb, and Lb of the rubber material molding of this invention. It is the schematic which shows an example of the closed kneading apparatus used in this invention, and the kneading | mixing state in the apparatus. It is the schematic which shows D, Wm, and Rm in the 1 type | mold airtight kneading apparatus provided with the two rotors which have one blade | wing used in this invention. It is the schematic which shows D, Wm, and Rm in the two-blade closed-type kneading apparatus provided with two rotors having two blades used in the present invention. It is the schematic which shows D, Wm, and Rm in the three-blade closed-type kneading apparatus provided with two rotors having three blades used in the present invention. It is a schematic diagram which shows one example of the rubber material molded object aggregate | assembly of this invention. It is a schematic diagram which shows another example of the rubber material molded object aggregate | assembly of this invention.

The rubber material molded body of the present invention is a rubber material molded body used for obtaining a rubber composition by kneading in a closed kneading apparatus having a plurality of rotors, and includes at least a diene rubber component and a filler component. And the shape satisfies the following formulas (1), (2) and (3).
0.05Dm ≦ Gb ≦ 2Dm (1)
0.15 Wm ≦ Wb ≦ 0.95 Wm (2)
1.5Rm ≦ Lb ≦ 32Rm (3)
In the formula (1), Gb is the thickness of the rubber material molding, and Dm is the maximum value of the gap distance between the rotors perpendicular to the rotation axis of the rotor on the plane including the rotation axis of the rotor of the kneading apparatus. In Formula (2), Wb is the width of the rubber material molded body, and Wm is the width of the kneading chamber parallel to the rotor rotation axis of the kneading apparatus. In the formula (3), Lb is the length of the rubber material molding, and Rm is the maximum rotor rotation radius of the kneading apparatus.

The shape of the molded rubber material of the present invention is not limited as long as the above formulas (1), (2) and (3) are satisfied. For example, a bale shape, a sheet shape, a string shape, etc. are mentioned. The veil shape is usually preferably a rectangular parallelepiped or a rectangular parallelepiped, and the sheet shape may be a long body. The string may have any of square, rectangular, circular, polygonal, elliptical and the like in cross section, but the cross section is preferably square or rectangular from the viewpoint of increasing bulk specific gravity.
Moreover, it is preferable that the mass of the rubber material molded body of the present invention is 40 kg or less. This is because it can be carried by human power, and the cost for packaging can be reduced and the accuracy of kneading using the molded rubber material can be improved. From this viewpoint, it is more preferably 0.006 to 36 kg.

Hereinafter, Gb, Wb, Lb, Dm, Wm and Rm described in the above formulas (1), (2) and (3) will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a method for displaying dimensions of Gb, Wb and Lb of a molded rubber material according to the present invention. FIG. 1 is only a schematic diagram showing a dimension display method, and does not limit the shape of the molded rubber material of the present invention.

Next, as a premise for explaining Dm, Wm and Rm of the kneading apparatus, an outline of the closed kneading apparatus will be described. As the closed type kneader, continuous closed type kneaders such as a multi-screw kneading extruder such as a twin screw kneading extruder and a continuous closed type kneader such as a single screw kneading extruder, and batch type closed kneading such as an internal type mixer and a Banbury type mixer. There is a machine. As the batch type closed kneader, there are a tangential type and a meshing type. The tangential type is a method in which the rotors do not mesh with each other, and is a method in which a kneading action is exerted by shearing between the tip of the rotor tip (tip of the blade) and the casing (wall surface in the kneading chamber). On the other hand, the meshing type is a system in which the rotors mesh with each other, and is a system that exhibits crushing and kneading actions between the two rotors. In addition, the rotor shape is a one-blade type having two rotors each having one blade, a two-blade type having two rotors having two blades, and a three-blade having two rotors having three blades. There are types.
FIG. 2 is a schematic view showing an example of a closed kneading apparatus used in the present invention and a kneading state in the apparatus.

The closed-type kneading apparatus shown in FIG. 2 is a tangential one-wing batch-type closed-type kneader, and is referred to as a “kneader”. The closed kneading apparatus 20 includes a kneader 21, a power unit 31, a hydraulic cylinder 34, and a guide lot 35. This kneader 21 is configured by a combination of a kneader body 22 and a floating weight 32. The kneading machine main body 22 forms a kneading chamber (kneading chamber) 23 in which two cylindrical surfaces formed in a semicircular cross section are combined. An opening 24 formed in a cylindrical surface is provided above the kneading chamber 23.
As the kneader, a Banbury type or a pressure kneader is generally used.

The central axis of the semicircular cylindrical surface of the kneading chamber 23 is provided with a pair of rotors 25a and 25b. The first rotor 25a has a rotating shaft 26a and the second rotor 25b has a rotating shaft 26b. Yes. The first rotor 25a and the second rotor 25b are provided with a first blade 27a and a second blade 27a, respectively. The pair of rotors 25a and 25b are rotated by the power unit 31 around the first and second rotary shafts 26a and 26b, and are rotated by the first blade 27a and the second blade 27b. The rubber composition 10 and the rubber compounding material are kneaded while being sheared to produce the rubber composition 10.
The floating weight 32 is provided with an outer peripheral surface 33 that fits inside the opening 24 of the kneader main body 22, and the rubber material molding and the rubber compounding material are mixed by the pressure from the hydraulic cylinder 34 and the guide lot 35. The press-in pressure contact is made so that it is easy to do.

FIG. 3 is a schematic view showing D, Wm, and Rm in a one-wing type closed kneading apparatus having two rotors having one blade used in the present invention. D is a gap distance between the rotors perpendicular to the rotation shafts 26a and 26b of the rotor on a plane including the rotation shafts 26a and 26b of the rotors 25a and 25b of the kneader 21, and Dm is the maximum value of D. Wm is the width of the kneading chamber 23 parallel to the rotor rotation axis of the kneading apparatus (that is, the width of the kneading chamber). Rm is the maximum rotor rotation radius of the kneading apparatus 20.
FIG. 4 is a schematic view showing D, Wm and Rm in a two-wing type closed kneading apparatus having two rotors having two blades used in the present invention, and FIG. 5 is used in the present invention. It is the schematic which shows D, Wm, and Rm in the three-blade closed-type kneading apparatus provided with two rotors having three blades. Similarly, D, Wm, and Rm are shown for the 2-wing type and the 3-wing type.
Although the tangential type has been described above, D, Dm, Wm, and Rm can be specified in the same manner in the meshing type. Similarly, D, Dm, Wm and Rm can be specified in the case of a continuous closed kneader such as a biaxial kneading extruder and a single screw kneading extruder. In the case of a single-screw kneading extruder, D is a gap between the rotor and the inner wall of the single-screw kneading extruder perpendicular to the rotary shaft of the rotor on a plane including the rotary shaft of the rotor of the single-screw kneading extruder. This is the distance, and Dm is the maximum value.

  The bulk specific gravity Dv of the molded rubber material of the present invention is preferably 0.42 or more. This is because if the bulk specific gravity Dv is 0.42 or more, the shape of the rubber material molded body can be maintained and the number of man-hours and costs related to packaging can be reduced. In this respect, 0.45 or more is more preferable.

In the present invention, if the Mooney viscosity ML _{1 + 4 at} 130 ° C. is 85 to 140 or the Mooney viscosity MS _{1 + 4 at} 130 ° C. is 68 to 112 in the present invention, the rubber material molding of the present invention is performed. The effect of reducing the load on the closed kneading apparatus due to the use of the body increases, which is preferable. If the Mooney viscosity ML _{1 + 4 at} 130 ° C. is 90 to 130 or the Mooney viscosity MS _{1 + 4 at} 130 ° C. is 72 to 104, the sealed kneading apparatus using the molded rubber material of the present invention is used. The effect of reducing the load is further increased, which is preferable.

The molded rubber material of the present invention comprises at least a diene rubber component and a filler component.
The diene rubber component is selected from the group consisting of natural rubber, butadiene rubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, butyl rubber, and halogenated butyl rubber. At least one selected rubber is preferably used.
Suitable examples of the filler component include at least one selected from the group consisting of carbon black, silica, and inorganic fillers other than silica.
The rubber material molded body of the present invention contains rubber compounding materials other than vulcanizing agents and vulcanization accelerators, for example, softeners such as process oils; resins such as petroleum resins and natural resins; And waxes; vulcanization activators such as zinc white and stearic acid may be included.

As an inorganic filler other than the silica, an inorganic filler represented by the following general formula (4) is preferable.
mM ¹ · xSiOy · zH ₂ O (4)
Here, M ¹ is a metal selected from the group consisting of aluminum, magnesium, titanium, calcium, and zirconium, an oxide or hydroxide of the metal, a hydrate of the oxide or the hydroxide, and the It is at least one selected from the group consisting of metal carbonates, and m, x, y and z are each an integer of 1 to 5, an integer of 0 to 10, an integer of 2 to 5, and an integer of 0 to 10 It is. However, in the above formula (4), when both x and z are 0, the inorganic filler is at least one metal selected from aluminum, magnesium, titanium, calcium and zirconium, metal oxide or metal hydroxide. It becomes a thing.

As the inorganic filler represented by the general formula (4), .gamma.-alumina, alumina (Al ₂ O ₃₎ such as α- alumina, boehmite, alumina monohydrate such as diaspore (Al ₂ O ₃ · H ₂ O), Gibbsite, Bayerite, etc. Aluminum hydroxide [Al (OH) ₃ ], Aluminum carbonate [Al ₂ (CO ₃ ) ₂ ], Magnesium hydroxide [Mg (OH) ₂ ], Magnesium oxide (MgO), Carbonic acid Magnesium (MgCO ₃ ), talc (3MgO · 4SiO ₂ · H ₂ O), attapulgite (5MgO · 8SiO ₂ · 9H ₂ O), titanium white (TiO ₂ ), titanium black (TiO _2n-1 ), calcium oxide (CaO ), calcium hydroxide [Ca (OH) _2], magnesium aluminum oxide _{(MgO · Al 2 O 3)} , clay _{(Al 2 O 3 · 2SiO 2} ), kaolin ( _{l 2 O 3 · 2SiO 2 ·} 2H 2 O), pyrophyllite _{(Al 2 O 3 · 4SiO 2} · H 2 O), bentonite _{(Al 2 O 3 · 4SiO 2} · 2H 2 O), aluminum silicate (Al ₂ SiO ₅ , Al ₄ · 3SiO ₄ · 5H ₂ O, etc.), magnesium silicate (Mg ₂ SiO ₄ , MgSiO ₃ etc.), calcium silicate (Ca ₂ · SiO ₄ etc.), aluminum calcium silicate (Al ₂ O ₃ · CaO · 2SiO ₂ etc.), magnesium calcium silicate (CaMgSiO ₄ ), calcium carbonate (CaCO ₃ ), zirconium oxide (ZrO ₂ ), zirconium hydroxide [ZrO (OH) ₂ · nH ₂ O], zirconium carbonate [ Zr (CO _{3) 2],} hydrogen to correct electric charge as various zeolites, crystalline aluminosilicates such as containing alkali metal or alkaline earth metal is used Kill. Further, it is preferable that M ¹ in the general formula (4) is at least one selected from aluminum metal, aluminum oxide or hydroxide, hydrates thereof, and aluminum carbonate.
These inorganic fillers represented by the above formula (4) may be used alone or in combination of two or more, and used in combination with the carbon black and / or silica. Can do.

The material constituting the molded rubber material of the present invention includes not only a masterbatch that is a composite of a diene rubber component and a filler component, but also a rubber composition such as a vulcanizable rubber composition.
Here, the master batch may be a so-called wet master batch obtained by mixing and solidifying a rubber latex and a filler slurry, or kneading a raw rubber of natural rubber or synthetic rubber and a filler in a kneading apparatus. The so-called dry masterbatch obtained in this way may be used.

  The wet masterbatch according to the present invention includes, for example, a rubber latex and a filler slurry mixed and solidified, a solid content is separated from a coagulated liquid containing solidified material, dehydrated and dried, followed by extrusion and / or roll processing. Thus, the rubber material molded body of the present invention is formed into a predetermined shape. Here, as described in Patent Document 4, for example, a multi-screw kneading extruder, for example, a twin-screw kneading extruder, is used to extrude the solid content supplied into the heated barrel with a plurality of screws. Thus, moisture in the solid content may be heated and evaporated to dry, and the rubber material molded body made of a wet master batch may be continuously produced by performing the drying process and the extrusion process simultaneously.

Moreover, it is preferable to use it as a rubber material molded body aggregate formed by assembling a plurality of rubber material molded bodies of the present invention.
FIG. 6 is a schematic view showing an example of the rubber material molded body assembly 2 of the present invention. A rubber material molded body assembly 2 shown in FIG. 6 is obtained by laminating a predetermined number of sheet-shaped rubber material molded bodies 1 (for example, 2 to 30 sheets, preferably 3 to 20 sheets), Wrapped. The wrapping is performed, for example, by being fixed at a plurality of positions by the resin film long body 5. In FIG. 6, the resin film long body a (5a), the resin film long body b (5b), and the resin film long body c (5c) are fixed at three places.
FIG. 7 is a schematic view showing another example of the rubber material molded body assembly 2 of the present invention. The rubber material molded body aggregate 2 shown in FIG. 7 is obtained by arranging a predetermined number (for example, 2 to 50, preferably 4 to 40) of string-shaped rubber material molded bodies 1, and then using a long resin film body 5. Wrapped. The wrapping is performed by being fixed at a plurality of positions by the long resin film 5 as in FIG. In FIG. 7, the resin film long body a (5a), the resin film long body b (5b), and the resin film long body c (5c) are fixed at three places.

Hereafter, the outline of the manufacturing method of the rubber material molding aggregate 2 of this invention is demonstrated.
[Molding process of molded rubber material 1]
In the first step, the complex of the diene rubber component and the filler component is formed into a bale, sheet or string by an open roll, an extruder (for example, a single screw kneading extruder), a press or the like. Thus, the rubber material molded body 1 is obtained. The dimensions of the rubber material molded body 1 are usually Gb 2 to 250 mm, Wb 3 to 800 mm, and Lb 200 to 1500 mm, and may be used as they are without forming the rubber material molded body aggregate 2.

[Releasing material application process]
The obtained rubber material molded body 1 is provided with a release material between the rubber material molded bodies 1 as necessary. By providing the release material, the laminating operation and the arranging operation are facilitated, and the rubber material molded body aggregate 2 can be immediately separated at the time of use. Examples of the release material include a release agent such as calcium carbonate and a thin gauge resin film. Moreover, a release material may be applied or stuck at the time of cutting, or may be immersed in a dusting solution containing a release agent or the like before or after cutting.
When a thin gauge resin film or the like is used as the release material, the release material applying step and the laminating step or the arranging step may be performed simultaneously.
[Lamination or arrangement process]
The rubber material moldings 1 are laminated or arranged in a predetermined number or a predetermined number within the above range.

[Lapping process]
A predetermined number or a predetermined number of laminated or arranged rubber material molded bodies 1 are lapped to form a rubber material molded body aggregate 2. The wrapping method may be complete wrapping covering the entire surface of the laminated or arranged rubber material molded body 1, but the amount of the wrapping material increases and costs are increased, or when it is put into a processing machine such as a kneader, the physical properties of the rubber There is a risk of lowering. In order to eliminate these concerns, it is desirable to fix the rubber material molded body 1 with the resin film elongated body 5 preferably at a plurality of positions, more preferably at 2-10 positions, and even more preferably at 2-5 positions.
Here, the long resin film 5 is preferably one that can be put into the closed kneading apparatus together with the rubber material aggregate 2, and from this viewpoint, a resin film made of polyethylene, ethylene-vinyl acetate copolymer or polybutadiene. A long body is particularly preferred. The polyethylene may be any of high density polyethylene, linear low density polyethylene, high pressure method low density polyethylene, etc., and a biaxially stretched film is preferably used.
The shape of the long resin film may be appropriately selected according to the wrapping method, but is preferably 10 to 100 mm in width and 10 to 100 μm in thickness.

The bulk specific gravity Dv of the rubber material molded body assembly 2 of the present invention is preferably 0.42 or more because the shape of the rubber material molded body can be maintained and the number of man-hours and costs related to packaging can be reduced. Therefore, 0.45 or more is more preferable.
Further, the mass of the rubber material molded body assembly 2 can be carried by human power if it is 40 kg or less, and the cost for packaging can be reduced and the accuracy of kneading using the rubber material molded body can be improved. Since it can do, it is preferable and it is more preferable that it is 0.03-36 kg from this viewpoint.

The rubber material molded body 1 and / or rubber material molded body aggregate 2 of the present invention is a rubber compounding material, for example, various chemicals usually used in the rubber industry, for example, softeners such as process oil; petroleum resin, natural Resins such as resins; anti-aging agents and waxes; anti-scorch agents; vulcanizing activators such as zinc white and stearic acid; vulcanizing agents such as sulfur and insoluble sulfur; guanidines, thiurams, dithiocarbamines, thiazoles A rubber composition, particularly a vulcanizable rubber composition, can be obtained by kneading with other compounding materials and the like in a closed kneading apparatus.

  The obtained rubber composition, in particular the vulcanizable rubber composition, is vulcanized after molding, and used for tires such as tire treads, under treads, belts, carcass, sidewalls, bead parts, vibration proof rubbers, etc. , Belts, hoses and other rubber products such as industrial products, but particularly suitable for tires.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples. The Mooney viscosity (ML _{1 + 4} ) and bulk specific gravity test methods are as follows.
<Mooney viscosity (ML _{1 + 4} )>
According to JIS K 6300-1: 2001, the viscosity was measured when the rotor was rotated for 4 minutes after 1 minute of preheating at 130 ° C. using an L-shaped rotor.
<Bulk specific gravity>
In the case of a molded rubber material, first, about 100 g of a sample was collected and precisely weighed at room temperature (20 ° C.), and the mass was set to w ₁ (unit: g).
In the sheet-like rubber material molded body, the width, depth, and thickness were measured 10 times each, the volume V ₁ (unit: cm ³ ) was determined from the arithmetic mean value, and (w ₁ / V ₁ ) was calculated. . This was repeated 5 times, and the arithmetic average value of (w ₁ / V ₁ ) was defined as the bulk specific gravity.
In a string-like rubber material molding, the cross-sectional area is measured at 10 locations, the arithmetic mean value is calculated, the length is measured to determine the volume V ₂ (unit: cm ³ ), and (w ₁ / V ₂ ) was calculated. This was repeated 5 times, and the arithmetic average value of (w ₁ / V ₂ ) was defined as the bulk specific gravity.
In the pellet-shaped rubber material molded body, the volume V ₃ (unit: cm ³ ) after tapping was determined according to JIS K 7370: 2000, and (w ₁ / V ₃ ) was calculated. This was repeated 5 times, and the arithmetic average value of (w ₁ / V ₃ ) was defined as the bulk specific gravity.
In the case of an aggregate of molded rubber materials, a sample of about 100 cm ³ is taken and measured on its three sides to determine volume V ₄ (unit: cm ³ ), and its mass is precisely weighed, w ₂ (unit : (G), and (w ₂ / V ₄ ) was calculated. This was repeated 5 times, and the arithmetic average value of (w ₂ / V ₄ ) was defined as the bulk specific gravity.

Examples 1-9 and Comparative Examples 1-5
The Mooney viscosity (ML _{1 + 4} , 130 ° C.), shape, dimensions, and bulk specific gravity shown in Table 1 are obtained by combining the diene rubber component and filler component shown in Table 1 with the composition and manufacturing method shown in Table _1. And a rubber material molded body 1 having a mass (unit: “g”) having a shape, dimensions, bulk specific gravity and mass (unit: “g”) shown in Table 1. 2 was obtained. Each of these is kneaded with the amount of rubber (Kg) per batch shown in Table 1 according to the blending composition shown in Table 2 in the model and rotor-shaped closed kneading apparatus shown in Table 1 to obtain a vulcanizable rubber composition. The kneading situation at the time of obtaining was evaluated visually and with an ammeter attached to the closed kneading apparatus. The results are shown in Table 1.

[note]
1) N220: Carbon Black ISAF, manufactured by Asahi Carbon Co., Ltd., trade name “Asahi # 80”
2) A: Wet masterbatch (WMB) manufactured using a biaxial continuous kneading extruder
3) B: Dry masterbatch (DMB) produced using a batch-type closed kneader
4) C: Master batch (MB) obtained by further kneading a wet master batch (WMB) produced using a biaxial continuous kneading extruder using a batch-type closed kneader.
5) E: 5 sheet-shaped rubber material molded bodies casted with a release material (calcium carbonate) are laminated, and a high-pressure method low-density polyethylene biaxially stretched film is wrapped at three locations as shown in FIG. A molded material assembly was obtained.
6) F: 10 sheet-shaped rubber material moldings dusted with a release material (calcium carbonate) are laminated, and a rubber is obtained by wrapping at three points with a high-pressure low-density polyethylene biaxially stretched film as shown in FIG. A molded material assembly was obtained.
7) G: 15 pieces of string-like rubber material moldings dusted with a release material (calcium carbonate) are arranged, and rubber is wrapped by three places as shown in FIG. 7 with a high-pressure low-density polyethylene biaxially stretched film. A molded material assembly was obtained.
8) L: Batch type closed kneader: manufactured by Kobe Steel, trade name “OOC”
9) M: Batch type closed kneading machine: manufactured by Kobe Steel, trade name “F270”
10) N: Batch type closed kneader: Hitachi Koki Co., Ltd., trade name “K4”
11) P: tangential type, one airfoil type with two rotors having one blade 12) Q: tangential type, two airfoil type with two rotors having two blades 13) R: meshing type, 3 Three-wing type with two rotors having two blades <Kneading situation of rubber composition>
14) V: A slightly high current was observed at the time of charging.
15) X: The temperature did not rise and was in a pellet form and could not be kneaded.
16) Y: It took 5 minutes to charge the material due to excess current, and rubber scorch was observed in the rubber after kneading.
17) Z: The kneading apparatus stopped due to excessive current.

[note]
18) Anti-aging agent 6C: N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine, manufactured by Ouchi Shinsei Chemical Co., Ltd., trade name “NOCRACK 6C”
19) Vulcanization accelerator CZ: N-cyclohexyl-2-benzothiazolylsulfenamide, manufactured by Ouchi Shinsei Chemical Industry Co., Ltd., trade name “Noxeller CZ”

  As apparent from Table 1, in Examples 1, 2, 4 to 7, the load on the closed kneading apparatus was very low, and the kneading situation was good. In Examples 3, 8 and 9, a slightly high current was observed at the time of charging, but the load on the closed kneading apparatus was very low. On the other hand, in Comparative Examples 1, 3, 4 and 5, kneading was impossible. In Comparative Example 2, scorching of rubber occurred.

  The rubber material molded body and / or rubber material molded body aggregate of the present invention is used for various rubber products, for example, for passenger cars, light vehicles, light trucks, trucks and buses, dump trucks and off-the-roads. Used for rubber compositions suitable for tires (for construction vehicles), vibration-proof rubber, belt conveyors, hoses, rubber dams, seismic isolation rubbers, and the like.

DESCRIPTION OF SYMBOLS 1 Rubber material molding 2 Rubber material molding aggregate 5, 5a, 5b, 5c Resin film long body 20 Sealing-type kneading device 21 Kneading machine 22 Kneading machine main body 23 Kneading chamber 24 Opening 25a First rotor 25b Second Rotor 26a first rotating shaft 26b second rotating shaft 27a first blade 27b second blade 31 power section 32 floating weight 34 hydraulic cylinder 35 guide lot

Claims (12)

A rubber material molded body used for obtaining a rubber composition by kneading in a closed kneading apparatus having a plurality of rotors, comprising at least a diene-based rubber component and a filler component, and the shape thereof is represented by the following formula A molded rubber material characterized by satisfying (1), (2) and (3).
0.05Dm ≦ Gb ≦ 2Dm (1)
0.15 Wm ≦ Wb ≦ 0.95 Wm (2)
1.5Rm ≦ Lb ≦ 32Rm (3)
[In the formula (1), Gb is the thickness of the molded rubber material, and Dm is the maximum value of the gap distance between the rotors perpendicular to the rotation axis of the rotor on the plane including the rotation axis of the rotor of the kneading apparatus. In Formula (2), Wb is the width of the rubber material molded body, and Wm is the width of the kneading chamber parallel to the rotor rotation axis of the kneading apparatus. In the formula (3), Lb is the length of the rubber material molding, and Rm is the maximum rotor rotation radius of the kneading apparatus. ]   The molded rubber material according to claim 1, wherein the bulk specific gravity Dv is 0.42 or more. The rubber material molding according to claim 1 or 2, wherein Mooney viscosity ML _{1 + 4 at} 130 ° C is 85 to 140, or Mooney viscosity MS _{1 + 4 at} 130 ° C is 68 to 112. The diene rubber component is selected from the group consisting of natural rubber, butadiene rubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, butyl rubber and halogenated butyl rubber. 4. The rubber composition according to claim 1, wherein the filler component is at least one selected from the group consisting of carbon black, silica, and an inorganic filler represented by the following general formula (4). A molded rubber material according to the above.
mM ¹ · xSiOy · zH ₂ O (4)
[Wherein M ¹ is a metal selected from the group consisting of aluminum, magnesium, titanium, calcium, and zirconium, an oxide or hydroxide of the metal, a hydrate of the oxide or the hydroxide, and The metal carbonate is at least one selected from the group consisting of carbonates, and m, x, y and z are each an integer of 1 to 5, an integer of 0 to 10, an integer of 2 to 5, and 0 to 10 It is an integer. However, in the above formula (4), when both x and z are 0, the inorganic filler is at least one metal selected from aluminum, magnesium, titanium, calcium and zirconium, metal oxide or metal hydroxide. It becomes a thing. ]   The rubber material molded body according to any one of claims 1 to 4, wherein a wet master batch obtained by mixing and solidifying rubber latex and a filler slurry is dehydrated and dried, and then molded by extrusion and / or roll processing. .   The rubber material molded body according to any one of claims 1 to 5, having a mass of 40 kg or less.   A rubber material molded body aggregate formed by assembling a plurality of rubber material molded bodies according to any one of claims 1 to 6.   The aggregate of rubber material according to claim 7, wherein the bulk specific gravity Dv is 0.42 or more.   The mass of rubber material moldings according to claim 7 or 8, wherein the mass is 40 kg or less.   A rubber composition obtained by kneading the rubber material molded body according to any one of claims 1 to 6 and / or the rubber material molded body aggregate according to claim 7 and a compounding material for rubber in the closed kneading apparatus. object.   A rubber product using the rubber composition according to claim 10.   A tire using the rubber composition according to claim 10.

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