JP2000186154A - Kneading of natural rubber - Google Patents

Kneading of natural rubber

Info

Publication number
JP2000186154A
JP2000186154A JP36441598A JP36441598A JP2000186154A JP 2000186154 A JP2000186154 A JP 2000186154A JP 36441598 A JP36441598 A JP 36441598A JP 36441598 A JP36441598 A JP 36441598A JP 2000186154 A JP2000186154 A JP 2000186154A
Authority
JP
Japan
Prior art keywords
kneading
weight
natural rubber
parts
mastication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP36441598A
Other languages
Japanese (ja)
Inventor
Yoshihisa Shimoshimizu
義久 下清水
Susumu Suzuki
進 鈴木
Tokio Kajiyama
時雄 梶山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOKYO RUBBER SEISAKUSHO KK
Original Assignee
TOKYO RUBBER SEISAKUSHO KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TOKYO RUBBER SEISAKUSHO KK filed Critical TOKYO RUBBER SEISAKUSHO KK
Priority to JP36441598A priority Critical patent/JP2000186154A/en
Publication of JP2000186154A publication Critical patent/JP2000186154A/en
Pending legal-status Critical Current

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  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for kneading injection-moldable natural rubber, easily controlling its Mooney viscosity and giving the kneaded product of adequately low Mooney viscosity, by kneading the natural rubber stock incorporated with a kneading promoter under specific conditions and then kneading the above with a filler under specific conditions. SOLUTION: This method kneads (A) natural rubber incorporated with (B) a disulfide-based kneading promoter at 150 deg.C or lower for 10 to 17 min, and further kneads the above together with (C) a filler at 150 deg.C or lower for 10 min or shorter. It is preferable that 100 pts.wt. of the component A is kneaded together with 0.4 to 0.5 pt.wt. of the component B, e.g. 2,2'-dibenzamidodiphenyl disulfide incorporated with an activator, dispersant and oil or fat, and 40 pts.wt. or less of the component C, e.g. carbon black.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、天然ゴムに充填剤
を加えて所望の可塑度に混練りする天然ゴムの混練法に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for kneading natural rubber by adding a filler to natural rubber and kneading the rubber to a desired degree of plasticity.

【0002】[0002]

【従来の技術】従来、各種ホースや衝撃緩衝材等にゴム
製品が多用されている。このゴム製品の製造にあたって
は、天然ゴムに充填剤を加えて成形性を高め、加硫剤や
加硫促進剤を添加して各種の形状に成形し、加硫処理す
ることにより製造される。
2. Description of the Related Art Conventionally, rubber products have been frequently used for various hoses, shock absorbing materials and the like. In manufacturing this rubber product, it is manufactured by adding a filler to natural rubber to enhance moldability, adding a vulcanizing agent or a vulcanization accelerator, molding into various shapes, and vulcanizing.

【0003】天然ゴムに可塑性を付与して成形性を高め
るには、天然ゴムに素練り促進剤を添加して機械的に練
り込む(以下、素練りという)か、さらに補強材、軟化
剤、老化防止剤等の充填剤を添加して機械的に練り込む
(以下、混練りという)ことによって行われている。
[0003] In order to impart plasticity to natural rubber to enhance moldability, a natural rubber may be kneaded mechanically by adding a mastication accelerator (hereinafter referred to as mastication), or a reinforcing material, a softener, It is performed by adding a filler such as an antioxidant and mechanically kneading (hereinafter, kneading).

【0004】天然ゴムに充填剤を加えたゴム配合物の混
練りには、混練りされた練り生地の設定粘度範囲が広
く、また混練り状態が均一になるため、加圧型ニーダー
が多用されている。加圧型ニーダーは、互いに反対方向
へ回転する回転軸を有し、各回転軸に長短2枚のブレー
ドが取り付けられており、ゴム配合物を投入する混合槽
には加圧蓋が装着されていて、混練り時には、投入され
たゴム配合物を加圧蓋により押さえ込みながら各ブレー
ドにより練り込むようになっている。
[0004] In the kneading of a rubber compound obtained by adding a filler to natural rubber, a pressure-type kneader is frequently used because the set viscosity range of the kneaded dough is wide and the kneading state is uniform. I have. The pressure-type kneader has rotating shafts that rotate in opposite directions to each other, two long and short blades are attached to each rotating shaft, and a pressure lid is attached to the mixing tank for charging the rubber compound. At the time of kneading, each blade is kneaded by each blade while pressing the charged rubber compound with a pressure lid.

【0005】また、混練りされた練り生地を圧縮成形
機、トランスファ成形機、射出成形機等に投入し易い形
状に予め成形しておくためにロール成形機を用いる。ロ
ール成形機は、平行に設けられたロールの間に混練りさ
れたゴム配合物を、温度を加えつつ通過させて、所定の
厚みと幅のリボン状に圧延(以下、分出しという)する
ようになっている。
Further, a roll forming machine is used in order to form the kneaded dough into a shape which can be easily put into a compression molding machine, a transfer molding machine, an injection molding machine or the like. The roll forming machine is configured to pass the rubber compound kneaded between the rolls provided in parallel while applying a temperature, and to roll the rubber compound into a ribbon having a predetermined thickness and a predetermined width (hereinafter, referred to as “dispensing”). It has become.

【0006】このような天然ゴムに充填剤を加えたゴム
配合物の混練りおよび分出しでは、可塑度を表す一つの
指標であるムーニー粘度によって混練りの状態を評価し
た場合、機械的な練り込みのためムーニー粘度をコント
ロールすることが難しい。特に、ムーニー粘度を低くコ
ントロールした練り生地を製造することが困難であり、
混練りされた練り生地から製品を型成形するには、加硫
工程を伴う射出成形機による成形が難しくなるため、現
状では、圧縮成形機による成形が多く用いられている。
[0006] In the kneading and dispensing of such a rubber compound obtained by adding a filler to natural rubber, when the state of kneading is evaluated by Mooney viscosity, which is one index indicating plasticity, mechanical kneading is performed. It is difficult to control Mooney viscosity In particular, it is difficult to produce a kneaded dough with a low Mooney viscosity,
In order to mold a product from the kneaded dough, it is difficult to mold the product using an injection molding machine including a vulcanizing process. Therefore, at present, molding using a compression molding machine is often used.

【0007】〔問題点〕このような従来の天然ゴムの混
練法では、素練り促進剤が多すぎると加硫処理における
架橋性が悪くなるため添加量が限定され、また、充填剤
が多くなるとムーニー粘度が高くなり、成形性が悪くな
る。さらに、天然ゴムに充填剤を加えて機械的に混練り
する場合には、ムーニー粘度を所望の値にコントロール
することが困難で、混練り後のムーニー粘度が低くなり
すぎると、加圧型ニーダー等の混練り機に練り生地が粘
り付くようになって排出が難しくなり、また、ムーニー
粘度が高すぎると、練り生地の流動性が悪くなって射出
成形機では成形できなくなり、生産性が悪くなって、製
造コストが高くなる。
[Problems] In such a conventional method of kneading natural rubber, if the amount of the peptizing accelerator is too large, the crosslinking property in the vulcanization treatment is deteriorated, so that the amount of addition is limited. Mooney viscosity increases and moldability deteriorates. Furthermore, when the filler is added to the natural rubber and mechanically kneaded, it is difficult to control the Mooney viscosity to a desired value, and if the Mooney viscosity after kneading becomes too low, a pressurized kneader or the like is used. The kneaded dough becomes sticky to the kneading machine, making it difficult to discharge, and if the Mooney viscosity is too high, the flowability of the kneaded dough becomes poor, making it impossible to mold with an injection molding machine, resulting in poor productivity. As a result, the manufacturing cost increases.

【0008】[0008]

【発明が解決しようとする課題】本発明は、従来の技術
における前記問題点に鑑みてなされたもので、これを解
決するため具体的に設定した課題は、ムーニー粘度のコ
ントロールが容易となり、適度な低ムーニー粘度の練り
生地を容易に得ることができる天然ゴムの混練法を提供
することにある。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and an object specifically set to solve this problem is that Mooney viscosity can be easily controlled. It is an object of the present invention to provide a method for kneading natural rubber which can easily obtain a kneaded dough having a low Mooney viscosity.

【0009】[0009]

【課題を解決するための手段】前記課題を効果的に解決
できる具体的に構成された手段としての、本発明におけ
る請求項1に係る天然ゴムの混練法は、天然ゴムにジス
ルフィド系素練り促進剤を添加し 150℃以内の素練温度
で 10 〜 17 分間の素練りを行い、その後、充填剤を投
入し 150℃以内の混練温度で 10 分以内の混練りを行う
ことにより練り生地を作製したことを特徴とするもので
ある。
According to a first aspect of the present invention, there is provided a method for kneading natural rubber, which is a concretely configured means capable of effectively solving the above-mentioned problems. Knead dough by adding the ingredients and masticating for 10 to 17 minutes at a mastication temperature of 150 ° C or less, and then adding filler and kneading for 10 minutes or less at a kneading temperature of 150 ° C or less. It is characterized by having done.

【0010】また、請求項2に係る天然ゴムの混練法
は、前記素練り促進剤として2,2′−ジベンズアミド
−ジフェニルジスルフィドに活性剤、分散剤および油脂
類を混合したジスルフィド系素練り促進剤を 0.4〜0.5
重量部、前記充填剤としてカーボンブラックを 40 重量
部以内、亜鉛華を 5重量部以内、ステアリン酸を 2重量
部以内、およびアミン系老化防止剤を 2重量部以内添加
したことを特徴とする。
The method of kneading a natural rubber according to claim 2 is a method for kneading a disulfide-based compound in which an activator, a dispersant, and an oil or fat are mixed with 2,2'-dibenzamide-diphenyldisulfide as the mastication accelerator. 0.4-0.5
Parts by weight, as the filler, up to 40 parts by weight of carbon black, up to 5 parts by weight of zinc white, up to 2 parts by weight of stearic acid, and up to 2 parts by weight of an amine antioxidant.

【0011】そして、請求項3に係る天然ゴムの混練法
は、さらに硫黄 3重量部以内および加硫促進剤 1重量部
を添加し、 80 〜100 ℃の練込み温度で5分間ロール練
りにより分出ししたことを特徴とする。
According to a third aspect of the present invention, in the method of kneading natural rubber, 3 parts by weight of sulfur and 1 part by weight of a vulcanization accelerator are further added, and the mixture is kneaded with a roll at a kneading temperature of 80 to 100 ° C. for 5 minutes. It is featured.

【0012】[0012]

【発明の実施の形態】以下、本発明における実施の形態
を具体的に説明する。また、この実施の形態は、発明の
趣旨をより良く理解させるため具体的に説明するもので
あり、特に指定のない限り、発明内容を限定するもので
はない。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the contents of the invention unless otherwise specified.

【0013】この実施の形態における天然ゴムの混練法
は、天然ゴムにジスルフィド系素練り促進剤を添加して
150℃以内の素練温度で 10 〜 17 分間の素練りを行
い、その後に、充填剤を投入して 150℃以内の混練温度
で 10 分以内の混練りを行うことにより、ムーニー粘度
を 30 〜 40 、望ましくは 32 〜 35 に調整させた練り
生地を作製する。
The method of kneading natural rubber according to this embodiment comprises adding a disulfide-based pulverizing accelerator to natural rubber.
Perform a mastication at a mastication temperature of 150 ° C or less for 10 to 17 minutes, and then add a filler and perform a kneading at a kneading temperature of 150 ° C or less at a kneading temperature of 10 minutes or less to obtain a Mooney viscosity of 30 to A kneaded dough adjusted to 40, preferably 32 to 35 is prepared.

【0014】素練り時間が 10 分以内に短縮する場合に
は可塑度が効果的に低下しないから規定時間の範囲内で
できるかぎり長くすることが好ましい。また、素練り時
間および混練り時間が長すぎると経費が嵩み不経済であ
り、コスト高を招くので、必要な練り時間の範囲ででき
るだけ短くすることが好ましい。
If the mastication time is reduced to less than 10 minutes, the plasticity is not effectively reduced, so it is preferable to increase the mastication time as long as possible within the specified time. Further, if the kneading time and the kneading time are too long, the cost is increased and uneconomical, and the cost is increased. Therefore, it is preferable to shorten the kneading time as much as possible within the necessary kneading time.

【0015】天然ゴムに添加する素練り促進剤として
は、2,2′−ジベンズアミド−ジフェニルジスルフィ
ドに活性剤、分散剤および油脂類を混合したジスルフィ
ド系素練り促進剤を 0.4〜0.5 重量部以内含有させたも
のが望ましい。素練り促進剤の含有量が規定以下でも可
塑度が低下して柔らかくなるが、充填剤、加硫剤、加硫
促進剤等の添加物の影響により可塑度が変化するから、
この点を考慮して規定範囲内で多めに添加することが望
ましい。
The peptizing accelerator to be added to the natural rubber is 0.4 to 0.5 parts by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersant and an oil or fat with 2,2'-dibenzamide-diphenyl disulfide. It is desirable to include them. Even if the content of the mastication accelerator is less than or equal to the prescribed value, the plasticity decreases and becomes soft, but the filler, the vulcanizing agent, the plasticity changes due to the influence of additives such as the vulcanization accelerator,
Considering this point, it is desirable to add a large amount within the specified range.

【0016】また、充填剤としては、カーボンブラック
を 40 重量部以内、亜鉛華を 5重量部以内、ステアリン
酸を 2重量部以内、およびアミン系老化防止剤を 2重量
部以内添加したものが望ましい。充填剤を添加すると可
塑度が高くなって流動性が悪くなるから、多めに添加す
ることは好ましくない。
As the filler, those containing carbon black within 40 parts by weight, zinc white within 5 parts by weight, stearic acid within 2 parts by weight, and amine antioxidant within 2 parts by weight are desirable. . If a filler is added, the plasticity increases and the fluidity deteriorates. Therefore, it is not preferable to add a large amount of the filler.

【0017】また、混練り後、加硫剤としての硫黄 3重
量部以内および加硫促進剤 1重量部以内の範囲で添加し
て 80 〜100 ℃の練込み温度で約5分間ロール練りによ
り練り込むことが好ましい。加硫剤および加硫促進剤の
添加による影響は、可塑度を若干低下させるように作用
する傾向にある。ただし、実用上、後工程に影響しない
程度にすぎない。
After kneading, sulfur is added in a range of 3 parts by weight or less as a vulcanizing agent and 1 part by weight of a vulcanization accelerator, and the mixture is kneaded by roll kneading at a kneading temperature of 80 to 100 ° C. for about 5 minutes. Preferably. The effect of the addition of a vulcanizing agent and a vulcanization accelerator tends to act to slightly reduce plasticity. However, in practical use, it does not affect the subsequent steps.

【0018】このような条件でゴム配合物を混練するこ
とにより、可塑度がムーニー粘度で30 〜 40 、望まし
くは 32 〜 35 の練り生地を容易に得ることができ、得
られた練り生地が適度な流動性と硬さとを有することに
より、射出成形機により容易に型成形でき、生産性良く
ゴム製品を製造することができる。射出成形によるゴム
製品の製造が容易になるため、従来の圧縮成形機による
製造と比較して、格段に生産性が向上し、製造コストが
大幅に低減される。
By kneading the rubber compound under such conditions, a kneaded dough having a Mooney viscosity of 30 to 40, preferably 32 to 35 in plasticity can be easily obtained. By having excellent fluidity and hardness, it can be easily molded by an injection molding machine, and a rubber product can be manufactured with high productivity. Since the production of rubber products by injection molding is facilitated, the productivity is significantly improved and the production cost is significantly reduced as compared with the production using a conventional compression molding machine.

【0019】[0019]

【実施例】以下、実施例を詳細に説明する。 〔実施例1〕天然ゴムを 100重量部に、2,2′−ジベ
ンズアミド−ジフェニルジスルフィドに活性剤、分散剤
および油脂類を混合したジスルフィド系素練り促進剤を
0.5重量部添加し、加圧ニーダを使用して 150℃で 15
分間素練りし、これにカーボンブラック 40 重量部、亜
鉛華 5重量部、ステアリン酸 2重量部、アミン系老化防
止剤 2重量部添加して、さらに、 150℃で 10 分間混練
りして練り生地を作製した。この練り生地のムーニー粘
度を測定した結果、ML1+4 100 ℃=35であった。こ
れにより射出成形可能な範囲の可塑度を有する練り生地
が得られた。この練り生地に硫黄 3重量部と加硫促進剤
1重量部とを添加し、ロール成形機により約 100℃にて
5分間練り込み、リボン状に成形した。このリボン状の
練り生地のムーニー粘度を測定した結果、ML1+4 100
℃=32であった。これにより、天然ゴムを用いるゴム
配合物の射出成形可能な実用配合が得られた。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below in detail. [Example 1] 100 parts by weight of natural rubber and 2,2'-dibenzamide-diphenyl disulfide mixed with an activator, a dispersant and a fat or oil were mixed with a disulfide-based mastication accelerator.
Add 0.5 parts by weight and use a pressure kneader at 150 ° C for 15
After adding 40 parts by weight of carbon black, 5 parts by weight of zinc white, 2 parts by weight of stearic acid and 2 parts by weight of an amine antioxidant, knead the mixture at 150 ° C for 10 minutes. Was prepared. As a result of measuring the Mooney viscosity of this dough, ML 1 + 4 100 ° C. = 35. As a result, a kneaded dough having a plasticity in a range that allows injection molding was obtained. 3 parts by weight of sulfur and vulcanization accelerator
1 part by weight and at about 100 ° C with a roll forming machine
It was kneaded for 5 minutes and formed into a ribbon. As a result of measuring the Mooney viscosity of this ribbon-shaped dough, ML 1 + 4 100
° C = 32. As a result, a practical compound that can be injection molded of a rubber compound using natural rubber was obtained.

【0020】〔実施例2〕天然ゴムを 100重量部、2,
2′−ジベンズアミド−ジフェニルジスルフィドに活性
剤、分散剤および油脂類を混合したジスルフィド系素練
り促進剤を 0.4重量部添加して加圧ニーダを使用して 1
50℃で 15 分間素練りし、これにカーボンブラック 40
重量部、亜鉛華 5重量部、ステアリン酸 2重量部添加し
て、さらに150℃で 10 分間混練りして練り生地を作製
した。この練り生地のムーニー粘度を測定した結果、M
1+4 100 ℃=38であった。これにより、天然ゴムを
用いるゴム配合物におけるカーボンブラックの射出成形
可能な範囲の実用配合量が得られた。
Example 2 100 parts by weight of natural rubber, 2,
0.4 parts by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersant and an oil or fat with 2'-dibenzamide-diphenyl disulfide is added, and a pressure kneader is used.
Masticate at 50 ° C for 15 minutes, add carbon black 40
Parts by weight, 5 parts by weight of zinc white and 2 parts by weight of stearic acid were added and kneaded at 150 ° C. for 10 minutes to prepare a kneaded dough. As a result of measuring the Mooney viscosity of this dough, M
L 1 + 4 100 ° C. = 38 As a result, a practical compounding amount of carbon black in a rubber compound using natural rubber was obtained in a range that allows injection molding of carbon black.

【0021】〔実施例3〕天然ゴムを 100重量部、2,
2′−ジベンズアミド−ジフェニルジスルフィドに活性
剤、分散剤および油脂類を混合したジスルフィド系素練
り促進剤を 0.4重量部添加して加圧ニーダを使用して 1
50℃で 17 分間素練りした。この素練り後のムーニー粘
度を測定した結果、ML1+4 100 ℃=32であった。こ
れにより、天然ゴムの実際的な素練り時間を適用して射
出成形可能な範囲の可塑度となった。
Example 3 100 parts by weight of natural rubber, 2,
0.4 parts by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersant and an oil or fat with 2'-dibenzamide-diphenyl disulfide is added, and a pressure kneader is used.
Mastication was performed at 50 ° C. for 17 minutes. As a result of measuring the Mooney viscosity after mastication, ML 1 + 4 100 ° C. = 32. As a result, the plasticity was within a range that can be injection molded by applying the actual mastication time of natural rubber.

【0022】〔比較例1〕天然ゴムを 100重量部、2,
2′−ジベンズアミド−ジフェニルジスルフィドに活性
剤、分散剤および油脂類を混合したジスルフィド系素練
り促進剤を 0.1重量部添加して加圧ニーダを使用して 1
50℃で 3分間素練りした。この素練り後のムーニー粘度
を測定した結果、ML1+4 100 ℃=60であった。これ
により、天然ゴムの素練りにおいて極めて少量でも可塑
度が低下していることが明らかとなったが、可塑度が満
たされず、素練り時間および添加量ともに不足している
ことが分かった。
Comparative Example 1 100 parts by weight of natural rubber, 2,
0.1 parts by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersant, and an oil and fat with 2'-dibenzamide-diphenyl disulfide is added.
Masticated at 50 ° C for 3 minutes. As a result of measuring the Mooney viscosity after mastication, ML 1 + 4 100 ° C. = 60. As a result, it was revealed that the plasticity was reduced even in a very small amount in the mastication of natural rubber, but the plasticity was not satisfied, and it was found that both the mastication time and the amount added were insufficient.

【0023】〔比較例2〕天然ゴムを 100重量部、2,
2′−ジベンズアミド−ジフェニルジスルフィドに活性
剤、分散剤および油脂類を混合したジスルフィド系素練
り促進剤を 0.4重量部添加して加圧ニーダを使用して 1
50℃で 8分間素練りした。この素練り後のムーニー粘度
を測定した結果、ML1+4 100 ℃=45であった。これ
により、天然ゴムの素練りにおいて必要な可塑度を得る
ためには、素練り促進剤の量を増加させるだけでは不十
分であり、素練り時間を増加させなくてはならないこと
が明らかとなった。
Comparative Example 2 100 parts by weight of natural rubber, 2,
0.4 parts by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersant and an oil or fat with 2'-dibenzamide-diphenyl disulfide is added, and a pressure kneader is used.
It was masticated at 50 ° C. for 8 minutes. As a result of measuring the Mooney viscosity after mastication, ML 1 + 4 100 ° C. = 45. This reveals that in order to obtain the necessary plasticity in the mastication of natural rubber, it is not sufficient to simply increase the amount of the mastication accelerator, and it is necessary to increase the mastication time. Was.

【0024】〔比較例3〕天然ゴムを 100重量部、2,
2′−ジベンズアミド−ジフェニルジスルフィドに活性
剤、分散剤および油脂類を混合したジスルフィド系素練
り促進剤を 0.1重量部添加し、これにカーボンブラック
15 重量部、亜鉛華 5重量部、ステアリン酸 2重量部添
加して、加圧ニーダを使用して 150℃で 3分間混練りし
た。この混練り後のムーニー粘度を測定した結果、ML
1+4 100 ℃=60であった。これにより、天然ゴムの混
練りにおいて必要な可塑度を得るためには、充填剤を添
加させても改善されないことが明らかとなった。
Comparative Example 3 100 parts by weight of natural rubber, 2,
To 2'-dibenzamide-diphenyl disulfide, 0.1 part by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersing agent and fats and oils is added.
15 parts by weight, 5 parts by weight of zinc white and 2 parts by weight of stearic acid were added and kneaded at 150 ° C. for 3 minutes using a pressure kneader. As a result of measuring the Mooney viscosity after kneading, ML
1 + 4 100 ° C. = 60. Thus, it has been clarified that addition of a filler does not improve the plasticity required for kneading the natural rubber.

【0025】〔比較例4〕天然ゴムを 100重量部、2,
2′−ジベンズアミド−ジフェニルジスルフィドに活性
剤、分散剤および油脂類を混合したジスルフィド系素練
り促進剤を 0.1重量部添加し、これにカーボンブラック
50 重量部、亜鉛華 5重量部、ステアリン酸 2重量部添
加して、加圧ニーダを使用して 150℃で 4.5分間混練り
した。この混練り後のムーニー粘度を測定した結果、M
1+4 100 ℃=74であった。これにより、天然ゴムの
混練りにおいて、充填剤を増加させると可塑度も高くな
り、流動性が悪くなることが明らかとなった。
Comparative Example 4 100 parts by weight of natural rubber, 2,
To 2'-dibenzamide-diphenyl disulfide, 0.1 part by weight of a disulfide-based pulverizing accelerator obtained by mixing an activator, a dispersing agent and fats and oils is added.
50 parts by weight, 5 parts by weight of zinc white and 2 parts by weight of stearic acid were added and kneaded at 150 ° C. for 4.5 minutes using a pressure kneader. As a result of measuring the Mooney viscosity after kneading, M
L 1 + 4 100 ° C. = 74. Thereby, it became clear that when kneading the natural rubber, increasing the filler increased the plasticity and deteriorated the fluidity.

【0026】[0026]

【発明の効果】以上のように本発明における請求項1に
係る天然ゴムの混練法では、天然ゴムにジスルフィド系
素練り促進剤を添加して所定条件で素練りを行って可塑
性を高めるとともに充填剤を投入して所定条件で混練り
することにより粘り付きを防止して、ムーニー粘度のコ
ントロールを容易にし、所望の低ムーニー粘度を有する
練り生地を得ることができる。得られた練り生地が適度
な流動性と硬さとを有し、容易に射出成形機により型成
形でき、製造工程を効率化させることができる。射出成
形によるゴム製品の製造が容易になるため、従来の圧縮
成形機による製造に比較して、格段に生産性が向上し、
製造コストが大幅に低減される。
As described above, in the method for kneading natural rubber according to the first aspect of the present invention, a disulfide-based mastication accelerator is added to natural rubber, mastication is performed under predetermined conditions, and plasticity is increased while filling. By adding the agent and kneading the mixture under predetermined conditions, stickiness is prevented, the Mooney viscosity can be easily controlled, and a kneaded dough having a desired low Mooney viscosity can be obtained. The obtained dough has appropriate fluidity and hardness, can be easily molded by an injection molding machine, and the production process can be made more efficient. Since the production of rubber products by injection molding becomes easier, productivity is significantly improved compared to the production by conventional compression molding machines,
Manufacturing costs are greatly reduced.

【0027】また、請求項2に係る天然ゴムの混練法で
は、前記素練り促進剤として2,2′−ジベンズアミド
−ジフェニルジスルフィドに活性剤、分散剤および油脂
類を混合したジスルフィド系素練り促進剤を 0.4〜0.5
重量部、前記充填剤としてカーボンブラックを 40 重量
部以内、亜鉛華を 5重量部以内、ステアリン酸を 2重量
部以内、およびアミン系老化防止剤を 2重量部以内添加
したことにより、容易に、ムーニー粘度で 30 〜 40 、
望ましくは 32 〜 35 のゴム配合物を得ることができ、
得られたゴム配合物が適度な流動性と硬さとを有するこ
とにより、射出成形機による成形が容易にできる。
Further, in the method for kneading natural rubber according to claim 2, a disulfide-based kneading accelerator in which an activator, a dispersant, and an oil or fat are mixed with 2,2'-dibenzamide-diphenyl disulfide as the kneading accelerator. 0.4-0.5
Parts by weight, carbon black within 40 parts by weight, zinc white within 5 parts by weight, stearic acid within 2 parts by weight, and amine antioxidant within 2 parts by weight. Mooney viscosity 30-40,
Desirably 32 to 35 rubber compounds can be obtained,
When the obtained rubber compound has appropriate fluidity and hardness, molding by an injection molding machine can be easily performed.

【0028】また、請求項3に係る天然ゴムの混練法で
は、得られたゴム配合物に、さらに、硫黄 3重量部以内
および加硫促進剤 1重量部を添加し、 80 〜100 ℃の練
込み温度で5分間ロール練りにより分出ししたことによ
り、次工程の射出成形を容易にし、生産性を高め、製造
工程を効率化して、製造コストを低減させることができ
る。
In the method of kneading natural rubber according to claim 3, the obtained rubber compound is further added with up to 3 parts by weight of sulfur and 1 part by weight of a vulcanization accelerator, and the mixture is kneaded at 80 to 100 ° C. By performing the dispensing by roll kneading at the set temperature for 5 minutes, the injection molding in the next step can be facilitated, the productivity can be increased, the production process can be made more efficient, and the production cost can be reduced.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 梶山 時雄 神奈川県藤沢市菖蒲沢48番地 株式会社東 京ゴム製作所内 Fターム(参考) 4F070 AA05 AC04 AC05 AC14 AC40 AC50 AC65 AE02 AE03 AE08 AE30 FA07 FB07 GA10 GB02 GB08 4F201 AA45 AB03 AB06 AB07 AB11 AB18 AB22 AR06 AR11 AR15 BA01 BC01 BC12 BC37 BK16 4J002 AC011 DA037 DA040 DE108 EF059 EV086 FD017 FD018 FD030 FD140 FD150 FD200 FD206  ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tokio Kajiyama 48 Shobuzawa, Fujisawa-shi, Kanagawa F-term in Tokyo Rubber Works, Ltd. (reference) 4F070 AA05 AC04 AC05 AC14 AC40 AC50 AC65 AE02 AE03 AE08 AE30 FA07 FB07 GA10 GB02 GB08 4F201 AA45 AB03 AB06 AB07 AB11 AB18 AB22 AR06 AR11 AR15 BA01 BC01 BC12 BC37 BK16 4J002 AC011 DA037 DA040 DE108 EF059 EV086 FD017 FD018 FD030 FD140 FD150 FD200 FD206

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】天然ゴムにジスルフィド系素練り促進剤を
添加し 150℃以内の素練温度で 10〜 17 分間の素練り
を行い、その後、充填剤を投入し 150℃以内の混練温度
で 10 分以内の混練りを行うことにより練り生地を作製
したことを特徴とする天然ゴムの混練法。
1. A disulfide-based mastication accelerator is added to natural rubber, and mastication is performed at a mastication temperature of 150 ° C. or less for 10 to 17 minutes. A method for kneading natural rubber, wherein a kneaded dough is produced by kneading within minutes.
【請求項2】前記素練り促進剤として2,2′−ジベン
ズアミド−ジフェニルジスルフィドに活性剤、分散剤お
よび油脂類を混合したジスルフィド系素練り促進剤を
0.4〜0.5 重量部、前記充填剤としてカーボンブラック
を 40 重量部以内、亜鉛華を 5重量部以内、ステアリン
酸を 2重量部以内、およびアミン系老化防止剤を 2重量
部以内添加したことを特徴とする請求項1記載の天然ゴ
ムの混練法。
2. A disulfide-based mastication accelerator comprising 2,2'-dibenzamide-diphenyl disulfide mixed with an activator, a dispersant and an oil or fat as the mastication accelerator.
0.4 to 0.5 parts by weight, carbon black is added as a filler within 40 parts by weight, zinc white is added within 5 parts by weight, stearic acid is added within 2 parts by weight, and an amine antioxidant is added within 2 parts by weight. The method for kneading natural rubber according to claim 1, wherein
【請求項3】さらに硫黄 3重量部以内および加硫促進剤
1重量部を添加し、 80 〜100 ℃の練込み温度で5分間
ロール練りにより分出ししたことを特徴とする請求項2
記載の天然ゴムの混練法。
3. A sulfur accelerator and a vulcanization accelerator.
3. A method according to claim 2, wherein 1 part by weight is added and the mixture is dispensed by roll kneading at a kneading temperature of 80 to 100 DEG C. for 5 minutes.
A method for kneading the natural rubber according to the above.
JP36441598A 1998-12-22 1998-12-22 Kneading of natural rubber Pending JP2000186154A (en)

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ID=18481753

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Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008094266A (en) * 2006-10-12 2008-04-24 Bridgestone Corp Reclaimed tire
WO2015055511A1 (en) * 2013-10-16 2015-04-23 Lanxess Deutschland Gmbh Determination of the degree of branching
JP2015535894A (en) * 2012-09-28 2015-12-17 コンパニー ゼネラール デ エタブリッスマン ミシュラン In-situ rubberized cords containing compositions containing organic polysulfides
JP2016199723A (en) * 2015-04-14 2016-12-01 住友ゴム工業株式会社 Mastication method and manufacturing method of rubber composition

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008094266A (en) * 2006-10-12 2008-04-24 Bridgestone Corp Reclaimed tire
JP2015535894A (en) * 2012-09-28 2015-12-17 コンパニー ゼネラール デ エタブリッスマン ミシュラン In-situ rubberized cords containing compositions containing organic polysulfides
WO2015055511A1 (en) * 2013-10-16 2015-04-23 Lanxess Deutschland Gmbh Determination of the degree of branching
CN105745228A (en) * 2013-10-16 2016-07-06 阿朗新科德国有限责任公司 Determination of the degree of branching
JP2016535255A (en) * 2013-10-16 2016-11-10 アランセオ・ドイチュランド・ゲーエムベーハー Measuring method of degree of branching
US10203319B2 (en) 2013-10-16 2019-02-12 Arlanxeo Deutschland Gmbh Determination of the degree of branching
JP2016199723A (en) * 2015-04-14 2016-12-01 住友ゴム工業株式会社 Mastication method and manufacturing method of rubber composition

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