JP5542416B2 - Soft-type furnace carbon black for anti-vibration rubber compounding and anti-vibration rubber composition containing the same - Google Patents

Description

  When blended with an elastomer such as rubber, the present invention makes it possible to reduce the dynamic magnification (dynamic spring constant (Kd) / static spring constant (Ks)) while maintaining the reinforcement and the static spring constant. As a result, the conventional hardness adjustment range can be maintained, i.e., the ratio of change in the hardness of the rubber composition can be maintained at a low level even when compounded with a high amount of rubber. The present invention relates to the provision of soft furnace carbon black for vibration rubber blending and the provision of a rubber composition in which this carbon black is blended with a rubber component.

In general, a vibration-proof rubber composed of a vibration-proof rubber composition is used as a member that suppresses support of an engine such as an automobile and transmission of vibration as the most familiar example. As a method of improving the vibration isolation performance, it is effective to reduce the value of dynamic magnification [dynamic spring constant (Kd) / static spring constant (Ks)] (lower dynamic magnification), but it satisfies the support performance. For this purpose, it is necessary that the elastic modulus (static spring constant) be a certain level or more in practical use.
As a method of adjusting these characteristics, a method of adjusting the amount of carbon black added is generally used. An increase in the amount of carbon black added is effective in that the effect of increasing the static spring constant is seen and the support performance is satisfied. However, an increase in the amount of carbon black added is also linked to an effect of increasing the dynamic spring constant, and eventually it becomes difficult to reduce the dynamic magnification.
Therefore, as a technique for reducing the dynamic ratio without increasing the amount of carbon black added, in order to obtain a rubber composition having a low dynamic ratio, suitable as a rubber material for vibration isolation, the particle diameter is large and the specific surface area is increased. For example, carbon black having the following characteristics has been proposed for use in vibration-proof rubber blending.

In Patent Document 1, the nitrogen adsorption specific surface area (N ₂ SA) is 14 to 23 m ² / g, the granulated particle hardness (IPH) is 9 cN or less, and the DBP absorption amount (ml / 100 g) is expressed by the following formula. Carbon black for anti-vibration rubber characterized by satisfying the value has been proposed.
DBP ≧ 13 × N ₂ SA-171
Further, in Patent Document 2, the CTAB specific surface area is 25 m ² / g or less, the DBP oil absorption is in the range of 90 to 150 ml / 100 g, and the aggregate Stokes equivalent diameter distribution with respect to the mode diameter (Dst) of the aggregate Stokes equivalent diameter distribution. A carbon black for heat-resistant and vibration-proof rubber has been proposed, which has a characteristic that the ratio (ΔDst / Dst) of the full width at half maximum (ΔDst) is less than 1.15.
The carbon blacks described in Patent Documents 1 and 2 have large numerical values for DBP absorption, thereby reducing the dynamic magnification in the rubber compound by reducing the compounding amount of carbon black. Aimed.
However, this means increases the substantial amount of polymer and oil, which are more expensive than carbon black, and is negative for the rubber composition in terms of cost. This means that the density of filler in the blended rubber is reduced, resulting in a decrease in gas permeation performance of the blended rubber. Furthermore, there is a drawback that it is difficult to maintain the hardness at a low level in a rubber compound in which the number of blended parts of the carbon black is increased.
On the other hand, in Patent Document 3, iodine adsorption amount (IA) is 20 to 30 mg / g, dibutyl phthalate absorption amount value (DBPA) is 25 to 35 ml / 100 g, and nitrogen adsorption specific surface area (N ₂ SA) to IA, N ₂ SA / IA is 0.85 to 1.10, and ΔDst / Dst of the carbon black aggregate in the centrifugal sedimentation method is 0.96 to 1.02. Soft furnace carbon black [where Dst is the mode value (nm) of the Stokes diameter of the carbon black aggregate obtained by centrifugal sedimentation analysis, and ΔDst is the two-point Stokes corresponding to 1/2 of the Dst frequency. proposed denote the difference in diameter] is the IA is 22~30mg / g, DBPA is _{26~33ml / 100g, N 2 SA /} IA is from 0.88 to 1.0 Also disclosed is a software-based furnace carbon black is.
The object of the invention described in Patent Document 3 is that when carbon black is blended with rubber, the tensile strength and fatigue resistance characteristics are maintained while maintaining low rubber hardness and elastic modulus equivalent to those of a conventional thermal black blended rubber composition. The object of the present invention is to provide a soft furnace carbon black capable of obtaining a rubber composition that is effectively improved, and a rubber composition containing the same. The invention disclosed in Patent Document 3 has the characteristics of a large particle size and a low structure, and this carbon black may be used for blending a vibration-proof rubber. _However, there the N 2 SA / IA numerical lower surface activity index of the carbon black to be displayed from 0.85 to 1.10 in, a level that can not be satisfied in the reinforcing performance.

  In recent years, the level of required performance for anti-vibration rubber has increased, anti-vibration performance (evaluated by dynamic magnification), processing performance (evaluated by unvulcanized physical properties), support performance (evaluated by static spring constant), reinforcement performance ( There is a demand for a carbon black that can simultaneously satisfy the contradictory properties of improving one of the other (evaluation by tensile strength), but the other property is reduced. However, there is still a carbon black that satisfies this requirement. Not.

JP 2000-248118 A JP 11-172145 A JP-A-9-48933

  The object of the present invention is that when carbon black is blended with rubber and / or polymer, vibration-proof performance is maintained while maintaining the same processing performance, support performance and reinforcement performance compared to conventional thermal type furnace carbon black. It is an object of the present invention to provide a soft furnace carbon black for blending a vibration-proof rubber and a rubber composition containing the same, which can provide a rubber composition that enables further improvement of the above.

１００〜１１５の範囲にあることを満足する防振ゴム配合用ソフト系ファーネスカーボンブラックであれば要求されるゴム特性を満たすことを見出したことが本発明の開始点であり、この特性を有するファーネスカーボンブラックをゴムに配合した場合にそのゴム組成物に対して本出願人が提出した特許文献３の従来のサーマルタイプのファーネスカーボンブラックと同等の加工性能、支持性能、補強性能を満足しながら、さらに防振性能を向上させる効果があることを見いだして本発明に到達したものである。
本発明の第２は、ジブチルフタレート吸収量（ＤＢＰＡ）が１０ｍｌ／１００ｇ以上で２８ｍｌ／１００ｇ未満、トルエン着色透過度（ＴＴ）が４５〜８５％の範囲にあることを特徴とする請求項１に記載の防振ゴム配合用ソフト系ファーネスカーボンブラックに関する。
本発明の第３は、下記式３で得られる窒素吸着比表面積（Ｎ_２ＳＡ）とＣＴＡＢ吸着比表面積（ＣＴＡＢ）の比（Ｚ）が０．９６〜１．０５であることを満足する請求項１または請求項２に記載の防振ゴム配合用ソフト系ファーネスカーボンブラックに関する。

本発明の第４は、天然ゴム及び／又は合成ゴム成分１００重量部に対して、請求項１ないし３いずれかに記載の防振ゴム配合用ソフト系ファーネスカーボンブラックを２０〜２２０重量部配合したことを特徴とする防振ゴム組成物に関する。 The present inventor earnestly researched on the development of carbon black that can improve the vibration-proof performance while maintaining the processing performance, support performance, and reinforcement performance of the rubber composition when blended with the rubber composition used for the vibration-proof rubber. As a result, the first of the present invention has a nitrogen adsorption specific surface area (N ₂ SA) of 10 to 30 m ² / g, a dibutyl phthalate absorption value (DBPA) of 30 ml / 100 g or less, and a toluene colored transmittance (TT). In a furnace carbon black having a ratio of 45% or more, the ratio of N ₂ SA to iodine adsorption (IA), (X) in the following formula 1 is more than 1.10 and less than 1.30, and transmission electron It is a measure of the complexity of the aggregate shape obtained by the following formula 2 obtained by dividing the square of the perimeter (PM) of the carbon black aggregate obtained from the microscopic image by the product of the projection area (A) and a constant. The value of Jo coefficient (Y) is

It was the starting point of the present invention that it was found that the soft furnace carbon black for blending an anti-vibration rubber satisfying the requirements of rubber properties satisfying the range of 100 to 115 is the starting point of the present invention. While satisfying the processing performance, support performance and reinforcement performance equivalent to the conventional thermal type furnace carbon black of Patent Document 3 submitted by the present applicant to the rubber composition when carbon black is blended with rubber, Furthermore, the present invention has been achieved by finding out that it has the effect of improving the anti-vibration performance.
The second aspect of the present invention is characterized in that the dibutyl phthalate absorption amount (DBPA) is 10 ml / 100 g or more and less than 28 ml / 100 g, and the toluene coloring transmittance (TT) is in the range of 45 to 85%. The present invention relates to a soft furnace carbon black for blending an anti-vibration rubber.
The third aspect of the present invention satisfies that the ratio (Z) of the nitrogen adsorption specific surface area (N ₂ SA) and the CTAB adsorption specific surface area (CTAB) obtained by the following formula 3 is 0.96 to 1.05. The present invention relates to a soft furnace carbon black for blending an anti-vibration rubber according to claim 1.

According to a fourth aspect of the present invention, 20 to 220 parts by weight of soft furnace carbon black for blending a vibration-proof rubber according to any one of claims 1 to 3 is blended with 100 parts by weight of a natural rubber and / or synthetic rubber component. The present invention relates to an anti-vibration rubber composition.

  Examples of rubber that can be applied to the present invention include natural rubber, styrene-butadiene rubber, isoprene rubber, chloroprene rubber, ethylene-propylene-diene copolymer rubber, butyl rubber, halogenated butyl rubber, and acrylonitrile-butadiene rubber. These rubbers can be used as the matrix component.

In the carbon black of the present invention, when N ₂ SA is less than 10 m ² / g, the reinforcing performance such as tensile strength is lowered in the rubber compound, and when it exceeds 30 m ² / g, the viscosity and hardness of the composition are increased. Therefore, it is difficult to achieve the characteristic of low hardness at the time of the high filling compounding characteristic of the thermal type furnace carbon black. When DBPA exceeds 30 ml / 100 g, the hardness of the rubber compound increases and the flexibility decreases, making it difficult to achieve the characteristic of low hardness when compounded in a large amount of rubber. Although the upper limit is 100 g, but less than 28 ml / 100 g is preferable because the above-described negative surface is hardly expressed. Also, if the lower limit of 10 ml / 100 g is not reached, the carbon black particles produced during the production of carbon black are more difficult to adhere to the production equipment, making continuous operation difficult. If this is exceeded, this phenomenon is not observed, which is more preferable. If the toluene coloring transmittance exceeds 85%, it is not preferable because by-products such as coke are easily accumulated in the carbon black particle production apparatus, which makes continuous operation difficult. Since it becomes difficult to avoid the contamination of the rubber compound, it is desirable to be in the range of 45 to 85%.

In the present invention, as an index representing the complexity of the carbon black aggregate, it is essential to control the shape factor (Y) representing the complexity of the aggregate obtained from Equation 2 from a transmission electron microscope image within a certain range. is there.
In general, DBPA is used as an index indicating the size of carbon black aggregates. However, in actuality, not only the amount absorbed inside the carbon black aggregates but also the gaps formed between the carbon black aggregates. The amount absorbed is also included. In the case of less than 30 ml / 100 g, the ratio of voids in the carbon black aggregates (which is influenced by the degree of particle connection) in the DBPA to be originally evaluated by the measurement method called DBPA is small, and conversely, Since the absorption amount occupies most, it becomes difficult to accurately evaluate the degree of structure development in the carbon black aggregate by DBPA. Therefore, as a result of studying a method for more accurately evaluating the degree of carbon black aggregate development, the present applicant has obtained a shape factor that represents the complexity obtained by the above-described equation 2 obtained by image analysis of a transmission electron microscope image. It has been found that the value of (Y) is useful as an index representing the degree of particle connection (development degree) in a carbon black having a low structure such as the carbon black of the present invention.
In the value of the shape factor (Y) representing this complexity, when this value is 100, it means that there is no perfect circle, that is, no connection of particles. As the structure develops, the value of the shape factor (Y) representing complexity increases. If the normal type DBPA is a thermal type carbon black of about 30 ml / 100 g, the shape factor (Y) representing the complexity is a value of about 120. The shape factor (Y) of carbon black in the present invention is in the range of 100 to 115, and is characterized by being smaller than ordinary thermal type carbon black and having less complexity (particle connection). When the shape factor (Y) representing this complexity is in the range of 100 to 115, vibration resistance is further improved while satisfying the processing performance, support performance, and reinforcement performance equivalent to those of conventional thermal type furnace carbon black. There is an effect to make. When it exceeds the shape factor (Y) 115 representing the complexity, there is a tendency that the processing performance deteriorates and the vibration isolation characteristics deteriorate. In addition, the numerical value of the shape index (Y) in carbon black having a normal structure generally used for rubber is 180 to 230. In addition, when the ratio (X) of the nitrogen adsorption specific surface area (N ₂ SA) and the iodine adsorption amount (IA) is less than 1.10, the dynamic ratio is increased and the vibration isolation performance tends to deteriorate. When it exceeds 3, there is a tendency that the toluene coloring permeability is lowered and it is difficult to avoid the contamination of the rubber compound. Furthermore, when the ratio (Z) of the nitrogen adsorption specific surface area (N ₂ SA) to the CTAB adsorption specific surface area (CTAB) is less than 0.96, it is difficult to avoid the contamination of the rubber compound by reducing the toluene coloration permeability. When the ratio exceeds 1.05, by-products are likely to accumulate in the carbon black particle production apparatus, so that continuous operation tends to be difficult. In addition, when the furnace carbon black of this research is blended below 20 parts by weight with respect to 100 parts by weight of the natural rubber and / or synthetic rubber component, it is difficult to obtain sufficient hardness as a vibration-proof rubber composition. When the blending amount exceeds 220 parts by weight, the decrease in tensile strength and the increase in dynamic magnification tend to become remarkable.

  As explained above, the carbon black of the present invention is suitable for low hardness, high filling compounding and low hardness hardness adjustment applications when blended with rubber, which is an advantage of conventional thermal type furnace carbon black. While maintaining the features, it is possible to reduce the dynamic magnification without deteriorating the processing performance, support performance and reinforcement performance.

FIG. 1 is a longitudinal front view showing an example of a production furnace suitable for producing the carbon black of the present invention. The left side is the furnace head, and the generation of carbon black proceeds from the left side to the right side. FIG. 2 shows the relationship between the shape factor of complexity in the nitrogen adsorption specific surface area and the dynamic magnification.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[Production example]
An oil furnace (diameter 600 mm, length 5000 mm) shown in FIG. 1 having the same structure as that of the cylindrical manufacturing furnace described in JP-A-1-229074 (Applicant Asahi Carbon) was used. It consists of a raw material oil introduction pipe provided with a raw material oil spray nozzle at its tip, and a cylindrical member that forms a circulation space of the raw material oil spray air surrounding it in the cylinder 1 space for raw material spray nozzle installation from the left furnace head. A raw material spray nozzle (not shown) was inserted, and raw material oil and air were sprayed into the reaction furnace. A first air hole group A (2, 2 '), a second air hole group B (3, 3') and a third air hole group C (4, 4 ') provided in a pair in the tangential direction of the reactor. Thermal type furnace carbon black having different physicochemical characteristic values was produced by introducing a more appropriate amount of air and changing the amount of air introduced from each air hole group and the amount of feedstock oil supplied. For the control of DBPA, a normal structure adjusting agent was appropriately used. The properties of the feedstock are as shown in Table 1.

実施例１〜５と比較例１〜６のカーボンブラックの製造条件を表２に示した。

Table 2 shows the production conditions for the carbon blacks of Examples 1 to 5 and Comparative Examples 1 to 6.

また、表２記載の製造条件により得られたカーボンブラックの物理化学特性を表３に示した。参照例としてサーマルブラックＭＴの物理化学特性についても記載した。各空気孔グループからの導入空気量ならびに原料油供給量を変化させることにより、窒素吸着比表面積（Ｎ_２ＳＡ）を調整した。なお、ＤＢＰ吸収量、複雑さ（Ｙ）の制御については通常のストラクチャー調整剤を適宜利用した。

Table 3 shows the physicochemical properties of the carbon black obtained under the production conditions described in Table 2. As a reference example, the physicochemical characteristics of thermal black MT are also described. The nitrogen adsorption specific surface area (N ₂ SA) was adjusted by changing the amount of air introduced from each air hole group and the amount of raw material oil supplied. In addition, about the control of DBP absorption amount and complexity (Y), a normal structure adjusting agent was appropriately used.

なお、実施例１〜５は本発明にかかるファーネスカーボンブラックであり、比較例１〜６は本発明のいずれかの物性要件において外れたカーボンブラックの例である。また参照例はＣａｎｃａｒｂ社製のサーマルブラックＴｈｅｒｍａｘ ＭＴである。

Examples 1 to 5 are furnace carbon blacks according to the present invention, and Comparative Examples 1 to 6 are examples of carbon blacks that are out of any physical property requirements of the present invention. A reference example is a thermal black Thermax MT manufactured by Cancarb.

（４）ＤＢＰ吸収量（ＤＢＰＡ）
ＪＩＳ Ｋ６２１７−４：２００１に記載の方法により測定され、１００ｇ当たりに吸収されるＤＢＰの容積（ｍｌ／１００ｇ）で表示される。
（５）トルエン着色透過度（ＴＴ）
ＪＩＳ Ｋ６２１８−４：２００５に記載の方法により測定され、カーボンブラック表面から抽出される物質によってトルエンが着色される程度を純粋なトルエンと比較させて透過度（％）として表示される。
（６）複雑さを表す形状係数（Ｙ）
ＡＳＴＭ Ｄ ３８４９−０７：２００８に記載の方法により最終倍率５，０００倍で表示された画像を株式会社ニレコ製の画像解析装置ＬＵＺＥＸ―ＦＳを用いて周囲長（ＰＭ）と投影面積（Ａ）から下記の式２を用いて算出される。

複雑さの測定意義・・・カーボンブラックの透過型電子顕微鏡像が円に近いほど１００に近い値になり、逆に周囲の形状が複雑なものほど大きな値になるのでアグリゲート形状の複雑性を評価する指標となる。 [Measurement of each characteristic]
The physicochemical properties of the carbon black according to the present invention are measured as follows.
(1) Nitrogen adsorption specific surface area (N ₂ SA)
It is measured by the method described in JIS K6217-2: 2001, and is expressed as the amount of nitrogen adsorbed per unit weight (m ² / g).
(2) Iodine adsorption (IA)
It is measured by the method described in JIS K6217-1: 2008, and is expressed as the amount of element (g / kg) adsorbed per unit weight.
(3) CTAB adsorption specific surface area (CTAB)
It is measured by the method described in JIS K6217-3: 2001, and is expressed as the amount of CTAB adsorbed per unit weight (m ² / g).
Indexes X and Z for evaluating the surface properties of carbon black are calculated from the measurement values obtained by the above three surface area measurement methods.

(4) DBP absorption (DBPA)
It is measured by the method described in JIS K6217-4: 2001, and is expressed as the volume of DBP absorbed per 100 g (ml / 100 g).
(5) Toluene color permeability (TT)
Measured by the method described in JIS K6218-4: 2005, the degree to which toluene is colored by a substance extracted from the surface of carbon black is compared with that of pure toluene, and is expressed as transmittance (%).
(6) Shape factor representing complexity (Y)
An image displayed at a final magnification of 5,000 times according to the method described in ASTM D 3849-07: 2008 is obtained from the perimeter (PM) and the projected area (A) using an image analyzer LUZEX-FS manufactured by Nireco Corporation. Calculated using Equation 2 below.

The significance of measurement of complexity: The closer the transmission electron microscope image of carbon black is to a circle, the closer it is to 100. Conversely, the more complex the surrounding shape is, the larger the value is. It becomes an index to evaluate.

[Rubber compounding characteristics]
Carbon black shown in Table 3 was blended with rubber at a ratio shown in Table 4 to obtain a rubber composition, and various properties were measured. The results are summarized in Table 5.

＊１ 商品名：ＪＳＯ−７９０〔日本サン石油（株）製 〕
＊２ 商品名：ノクセラーＴＴ〔大内新興化学工業（株）製〕

* 1 Product name: JSO-790 [Nihon Sun Oil Co., Ltd.]
* 2 Product name: Noxeller TT [Ouchi Shinsei Chemical Co., Ltd.]

※２５％歪みの場合、ε＝２５よりα＝１．２５となる
本発明では（株）東洋ボールドウイン社製テンシロンＵＴＭ−４−１００を用いて２５％歪みの低伸長応力（σ_２５）を測定し、その値を下記の式６のように１．６３９倍した値を静的せん断弾性率Ｇ_２５として算出した。

次に静的せん断弾性率Ｇ_εから静的ばね定数Ｋｓを求める。静的せん断弾性率Ｇ_εと静的ばね定数Ｋｓとの関係はポアソン比νを用いて下記の式７のように表すことができる。

本発明ではゴム組成物の体積が変化しないということを仮定し、ポアソン比νとして０．５を用いることにより、静的せん断弾性率Ｇ_２５を式８のように３倍することによって静的ばね定数を算出した。

・動倍率・・・・ＪＩＳ Ｋ６３８６：１９９９に記載された通り、動的ばね定数（Ｋｄ）／静的ばね定数（Ｋｓ）で表される。 The effect of the carbon black of the present invention will be described from the results of rubber characteristics shown in Table 5 in which the carbon blacks of the above examples and comparative examples were blended with natural rubber. The above characteristics were measured as follows.
-Unvulcanized physical properties-Mooney viscosity (ML1 + 4 '), minimum viscosity (Vm) and vulcanization time (t5) at 125 ° C were measured by the method described in JIS K6300-1: 2001, paragraph 6.
-Hardness-Measured by the method described in JIS K6253: 2007.
・ Tensile test ・ ・ ・ ・ ・ ・ A ring-shaped No. 1 test piece was used according to the method described in JIS K6251: 2004. Tensile properties were measured according to the test method.
· Dynamic spring constant [Kd, N / mm] ··· Measurement of dynamic spring constant using Rheograph Solid L-1R manufactured by Toyo Seiki Seisakusho Co., Ltd., temperature 25 ° C, frequency 100 Hz, dynamic strain The storage elastic modulus was measured under the measurement condition of ± 0.1%, and the value was used.
-Static spring constant [Ks, N / mm] ... The static spring constant can be obtained by measuring low elongation stress. First, the static shear modulus is obtained from the low elongation stress. Relationship low tensile stress sigma _epsilon and static shear modulus G _epsilon strain epsilon is JIS K7312: can be represented by Equations 4 and 5 below in 8.5.2 described 1996.

* In the case of 25% strain, α = 1.25 from ε = 25 In the present invention, low elongation stress (σ ₂₅ ) of 25% strain is applied using Tensilon UTM-4-100 manufactured by Toyo Baldwin Co., Ltd. A value obtained by multiplying the value by 1.639 as shown in the following formula 6 was calculated as a static shear modulus G ₂₅ .

Then obtains the static spring constant Ks from a static shear modulus G _epsilon. The relationship between the static shear modulus G _ε and the static spring constant Ks can be expressed by the following equation 7 using the Poisson ratio ν.

In the present invention, it is assumed that the volume of the rubber composition does not change, and by using 0.5 as the Poisson's ratio ν, the static shear modulus G ₂₅ is tripled as shown in Equation 8 to obtain a static spring. Constants were calculated.

· Dynamic magnification ··· As described in JIS K6386: 1999, it is expressed by dynamic spring constant (Kd) / static spring constant (Ks).

(1) Vibration isolation performance (evaluated by dynamic magnification) / support performance (evaluated by static spring constant) Generally, dynamic magnification tends to decrease as N ₂ SA decreases. Therefore, Comparative Examples 1 to 6 and Reference Examples (Y≈120 and 134) and Examples 1 to 3 (Y≈113) in which the shape factor (Y) of the complexity exceeded the upper limit of the present invention were compared with N ₂ SA. As a result (FIG. 2), the following was found.
A. When the dynamic magnifications of the comparative example and the example are compared with the same N ₂ SA, the example is lower.
B. The measurement points are arranged on a line summarized by the complexity shape factor (Y), and the smaller the complexity shape factor, the smaller the dynamic magnification.
Contrary to the decrease in dynamic spring constant and the accompanying decrease in dynamic magnification, the support performance evaluated by the static spring constant does not change greatly. Therefore, it can be seen that the support performance is equivalent to the support performance and the vibration isolation performance (dynamic magnification) is improved in the examples, although there is no difference in the support performance between the examples and the comparative examples.
(2) About processing performance (unvulcanized physical properties) There is no difference between Examples and Comparative Examples at the same N ₂ SA level. From this, it can be seen that the furnace carbon black of the present invention has the same processing performance (viscosity and vulcanization time) as a general thermal type furnace carbon black having the same N ₂ SA level.
(3) Reinforcing performance (tensile strength and elongation at break) At the same N ₂ SA level, there is no difference between Examples and Comparative Examples. From this, it can be seen that the furnace carbon black of the present invention has the same reinforcing performance as that of a general thermal type furnace carbon black having the same N ₂ SA level.
(4) Other characteristics In Example 3, the Z value calculated by Equation 3 is below the preferable range of 0.96. Small).
(5) Summary From the above (1) to (3), it can be seen that the furnace carbon black of the present invention has improved anti-vibration properties while being equivalent to processing performance, reinforcement performance and support performance.

1 Cylinder for installing raw material oil spray nozzle 2 First air hole group A
2 '1st air hole group A
3 Second air hole group B
3 '2nd air hole group B
4 3rd air hole group C
4 '3rd air hole group C

Claims (4)

In furnace carbon black having a nitrogen adsorption specific surface area (N ₂ SA) of 10 to 30 m ² / g, a dibutyl phthalate absorption (DBPA) of 30 ml / 100 g or less, and a toluene coloring transmittance (TT) of 45% or more, (1) Ratio of N ₂ SA and iodine adsorption amount (IA), (X) of the following formula 1 is more than 1.10 and less than 1.30, and (2) obtained from a transmission electron microscope image ambient length of the carbon black aggregate of the square measures der Ru shape factor of the complexity of the aggregate shape obtained by the following formula 2 divided by the product of the projected area (a) and constants (PM) (Y) Soft furnace carbon black for blending anti-vibration rubber, characterized in that the value is in the range of 100-115.

  Dibutyl phthalate absorption amount (DBPA) is 10 ml / 100 g or more and less than 28 ml / 100 g, and toluene coloring transmittance (TT) is in the range of 45 to 85%. Soft furnace carbon black. The ratio (Z) of the nitrogen adsorption specific surface area (N ₂ SA) and CTAB adsorption specific surface area (CTAB) obtained by the following formula 3 satisfies 0.96 to 1.05. Soft furnace carbon black for blending anti-vibration rubber as described.

  Anti-vibration characterized by blending 20 to 220 parts by weight of soft furnace carbon black for blending anti-vibration rubber according to any one of claims 1 to 3 with respect to 100 parts by weight of natural rubber and / or synthetic rubber component. Rubber composition.

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