JPH0726067A - Bead insulation rubber composition - Google Patents
Bead insulation rubber compositionInfo
- Publication number
- JPH0726067A JPH0726067A JP5175712A JP17571293A JPH0726067A JP H0726067 A JPH0726067 A JP H0726067A JP 5175712 A JP5175712 A JP 5175712A JP 17571293 A JP17571293 A JP 17571293A JP H0726067 A JPH0726067 A JP H0726067A
- Authority
- JP
- Japan
- Prior art keywords
- bead
- rubber composition
- insulation rubber
- fatty acid
- bead insulation
- 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
Links
- 239000011324 bead Substances 0.000 title claims abstract description 22
- 238000009413 insulation Methods 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 title claims abstract description 16
- 238000004073 vulcanization Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 150000004670 unsaturated fatty acids Chemical class 0.000 claims abstract description 8
- 235000021122 unsaturated fatty acids Nutrition 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 6
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 239000011593 sulfur Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000004359 castor oil Substances 0.000 description 9
- 235000019438 castor oil Nutrition 0.000 description 9
- 235000014113 dietary fatty acids Nutrition 0.000 description 9
- 229930195729 fatty acid Natural products 0.000 description 9
- 239000000194 fatty acid Substances 0.000 description 9
- 150000004665 fatty acids Chemical class 0.000 description 9
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 9
- 239000004902 Softening Agent Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010734 process oil Substances 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気入りタイヤのリムに
装着するビード部の剛性、締まりを確保しながら、工場
生産性を上げ得るビードインシュレーションゴム組成物
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bead insulation rubber composition capable of increasing factory productivity while ensuring rigidity and tightness of a bead portion mounted on a rim of a pneumatic tire.
【０００２】[0002]
【従来の技術】空気入りタイヤにおいて、ビードはカー
カスコードの両端を支持し、タイヤをリムに固定する役
割を有し、鋼線を束ねて作られている。これによって、
リムに対し若干の締め代を与え、空気圧充填によってぴ
ったりとリムに合うように作られる。この鋼線の束が内
圧充填時、あるいは荷重下における走行中の動きによっ
て、ばらけることのないように鋼線の束を包囲するビー
ドインシュレーションゴムと称される硬質ゴムが構成さ
れ、その役割を果たしている。2. Description of the Related Art In a pneumatic tire, a bead supports both ends of a carcass cord and serves to fix the tire to a rim, and is made by bundling steel wires. by this,
It is made to fit the rim exactly by pneumatic filling, giving a slight interference to the rim. A hard rubber called bead insulation rubber is configured to surround the bundle of steel wires so that the bundle of steel wires does not come apart during internal pressure filling or during running under load. Plays.
【０００３】一般にビードインシュレーションゴムは、
硬度を上げるため、配合内容としては硫黄、カーボンブ
ラックの量が非常に多いものである。そのため、ゴム状
物質の分子量および可塑度の目安である、未加硫ゴムの
粘度であるムーニー粘度が高くなり、工場における製造
上の作業性が悪く、連続したコードの被覆速度が上がら
ない等の問題がでてくる。従って生産性が上がらない。Generally, bead insulation rubber is
In order to increase the hardness, the content of sulfur and carbon black is very large. Therefore, the Mooney viscosity, which is the viscosity of the unvulcanized rubber, which is a measure of the molecular weight and plasticity of the rubber-like substance, increases, the workability in manufacturing in the factory deteriorates, and the coating speed of continuous cords does not increase. The problem comes out. Therefore, productivity does not increase.
【０００４】ムーニー粘度を下げて、生産性を上げるた
めには、カーボンブラックの減量、軟化剤（プロセスオ
イル等）の増量等の手段があるが、これらの方法ではゴ
ム硬度が低下することになる。In order to reduce the Mooney viscosity and increase the productivity, there are means such as reducing the amount of carbon black and increasing the amount of softening agent (process oil etc.), but these methods result in a decrease in rubber hardness. .
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的はビード
インシュレーションゴムの補強性指数を現行配合程度に
保持しながら、ムーニー粘度を低減させ、連続するコー
ドを被覆する上限速度の指数であるインシュレーション
指数を大きくし生産性を上げ、更にリム装着時のフィッ
ト性を上げ、横剛性を上げたビードインシュレーション
ゴム組成物を提供することである。The object of the present invention is to reduce the Mooney viscosity while maintaining the reinforcing index of the bead insulation rubber at the current level of compounding and to provide an index of the upper limit speed for coating continuous cords. It is an object of the present invention to provide a bead insulation rubber composition having a large ration index to improve productivity, further improve fit when mounted on a rim, and increase lateral rigidity.
【０００６】[0006]
【課題を解決するための手段】本発明者は前記課題を解
決するため鋭意研究を行った。本出願人は、先に特開平
４−１８９８５０号公報において、タイヤ等のゴム組成
物本体について、破断強度が一層向上したゴム組成物と
するのに共役ジエン酸を５重量％以上含有する分子内に
炭素二重結合を２個以上含む有機不飽和脂肪酸を加硫促
進助剤として配合することが有効であり、その有機不飽
和脂肪酸として脱水ひまし油脂肪酸が好適であることを
開示している。Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems. The applicant previously disclosed in JP-A-4-189850 that a rubber composition main body such as a tire has an intramolecular structure containing 5% by weight or more of conjugated dienoic acid in order to obtain a rubber composition having further improved breaking strength. It is effective to add an organic unsaturated fatty acid containing two or more carbon double bonds as a vulcanization accelerator, and it is disclosed that dehydrated castor oil fatty acid is suitable as the organic unsaturated fatty acid.
【０００７】本発明者は、これにヒントを得て、ビード
インシュレーションゴムに共役ジエン酸を含む有機不飽
和脂肪酸の内で最も好ましい脱水ひまし油脂肪酸を代表
として配合することを試みた所、この脱水ひまし油脂肪
酸は未加硫時には、ゴムの軟化剤として働き、プロセス
オイル等の軟化剤を増量することなくムーニー粘度を下
げ、生産性を上げると共に、加硫時には、硫黄と反応し
て、加硫促進助剤として働き、補強性を向上せしめると
共に、硬度の低下を防ぎ、リム装着時のフィット性を上
げ、横剛性を上げ得ることを見いだし、本発明を完成し
た。[0007] The inventor of the present invention, taking inspiration from this, tried to blend the bead insulation rubber with the most preferable dehydrated castor oil fatty acid among the organic unsaturated fatty acids containing the conjugated dienoic acid. Castor oil fatty acid acts as a softening agent for rubber when unvulcanized, lowers Mooney viscosity without increasing the amount of softening agents such as process oil, increases productivity, and reacts with sulfur during vulcanization to accelerate vulcanization. The present invention has been completed by discovering that it works as an auxiliary agent, improves the reinforcing property, prevents the hardness from lowering, improves the fitting property at the time of rim mounting, and the lateral rigidity.
【０００８】すなわち本発明は空気入りタイヤの鋼線束
よりなるビードコアを包囲するビードインシュレーショ
ンゴム組成物において、ゴム成分１００重量部に対し、
加硫促進助剤として共役ジエン酸を含む有機不飽和脂肪
酸を０．１〜２０重量部含むことを特徴とするビードイ
ンシュレーションゴム組成物である。以下共役ジエン酸
を１０％以上含み分子内に炭素−炭素二重結合を少なく
とも２つ持つ有機不飽和脂肪酸の中で最も好ましい脱水
ひまし油脂肪酸を代表としてこの有機不飽和脂肪酸を脱
水ひまし油脂肪酸と称する。That is, the present invention relates to a bead insulation rubber composition which surrounds a bead core made of a steel wire bundle of a pneumatic tire, based on 100 parts by weight of a rubber component.
A bead insulation rubber composition comprising 0.1 to 20 parts by weight of an organic unsaturated fatty acid containing a conjugated dienoic acid as a vulcanization accelerator. Hereinafter, the most preferable dehydrated castor oil fatty acid among organic unsaturated fatty acids containing 10% or more of conjugated dienoic acid and having at least two carbon-carbon double bonds in the molecule is referred to as dehydrated castor oil fatty acid.
【０００９】脱水ひまし油脂肪酸は、ゴム成分１００重
量部に対し、１〜３重量部という少量添加することによ
っても、軟化剤として有効に働き、ゴムのムーニー粘度
を下げ、工場作業性の改良は実現できる。しかし、２０
重量部を超えて、あまり多量に添加すると、ムーニー粘
度低下の効果は次第に小さくなり、また脱水ひまし油脂
肪酸を添加することで、コストは上がることから、入れ
れば入れる程コスト高になる。また１重量部未満ではム
ーニー粘度低下の効果はなく、作業性改良の効果が得ら
れない。The dehydrated castor oil fatty acid effectively acts as a softening agent by adding a small amount of 1 to 3 parts by weight to 100 parts by weight of the rubber component, lowers the Mooney viscosity of the rubber, and improves factory workability. it can. But 20
If it is added in an excessively large amount in excess of parts by weight, the effect of lowering the Mooney viscosity will gradually diminish, and the cost will increase with the addition of dehydrated castor oil fatty acid. If it is less than 1 part by weight, the Mooney viscosity is not lowered and the workability is not improved.
【００１０】[0010]
【実施例】以下に実施例により、本発明を更に具体的に
説明するが、本発明は、この実施例により何等限定され
るものではない。現行ゴム配合に対し、プロセスオイル
３重量部を添加したものを比較例１、脱水ひまし油脂肪
酸を１重量部添加したものを実施例１、同じく３重量部
添加したものを実施例２とした。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Comparative Example 1 was prepared by adding 3 parts by weight of process oil to the current rubber compound, Example 1 was prepared by adding 1 part by weight of dehydrated castor oil fatty acid, and Example 2 was prepared by similarly adding 3 parts by weight.
【００１１】検査特性値はムーニー粘度、補強性、イン
シュレーション速度で各々現行ゴム配合のものについて
の値を１００として、指数表示した。その結果を表１に
示す。 インシュレーション指数：連続するコードを被覆する際
の上限速度で、現行を１００として指数表示した。 補強性指数：加硫後のゴムのＥ'を現行配合を１００と
した指数で示した。Ｅ'は東洋精機製の粘弾性スペクト
ロメーターで室温、歪４％で測定した。 Ｅ′はそのまま、補強性指数をあらわす。即ち、ゴムの
弾性率を表わすことになる。Ｅ′が高ければゴムは硬い
ことになり、これにより、ビード（鋼線）との弾性率差
が小さくなり、歪みの集中を避けることができ、耐久性
において良方向にある。また鋼線同士の動きを抑制する
方向にあるため、ビードの安定性を高めることにもつな
がる。表１に本発明のビードインシュレーションゴム組
成物のゴム組成と、ムーニー粘度、補強性指数、インシ
ュレーション速度指数を示す。比較例１のゴム組成物に
脱水ひまし油脂肪酸を本発明の下限未満、即ち０．１重
量部未満配合した場合は、比較例１と殆んど同様の結果
を得た。The test characteristic values are expressed as indexes, with the Mooney viscosity, the reinforcing property and the insulation speed being 100 for the values for the current rubber compound. The results are shown in Table 1. Insulation index: The upper limit speed for coating continuous cords, and indexed with the current value as 100. Reinforcing index: E'of the rubber after vulcanization was shown as an index with the current compounding being 100. E'was measured with a viscoelasticity spectrometer manufactured by Toyo Seiki at room temperature and a strain of 4%. E'represents the reinforcing index as it is. That is, it represents the elastic modulus of rubber. If E ′ is high, the rubber is hard, and thus the difference in elastic modulus between the rubber and the bead (steel wire) is small, strain concentration can be avoided, and durability is good. In addition, since the movement of the steel wires tends to be suppressed, the stability of the bead is also increased. Table 1 shows the rubber composition of the bead insulation rubber composition of the present invention, the Mooney viscosity, the reinforcing index, and the insulation rate index. When dehydrated castor oil fatty acid was blended in the rubber composition of Comparative Example 1 below the lower limit of the present invention, that is, less than 0.1 part by weight, almost the same results as in Comparative Example 1 were obtained.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【発明の効果】工場における製造時、軟化剤として働
き、作業性を改良して生産性を上げる。加硫時、硫黄と
反応して硬度を確保し、補強性を保持し、リム装着時の
フィット性（締まり）を上げることで、運動性能におけ
る横剛性を高めることを可能にした。EFFECTS OF THE INVENTION When manufacturing in a factory, it works as a softening agent to improve workability and increase productivity. During vulcanization, it reacts with sulfur to secure hardness, retains reinforcing properties, and improves the fit (tightness) when mounting on the rim, making it possible to increase lateral rigidity in exercise performance.
Claims (1)
コアを包囲するビードインシュレーションゴム組成物に
おいて、ゴム成分１００重量部に対し、加硫促進助剤と
して共役ジエン酸を１０％以上含む分子内に炭素−炭素
二重結合を２つ以上持つ有機不飽和脂肪酸を０．１〜２
０重量部含むことを特徴とするビードインシュレーショ
ンゴム組成物。1. A bead insulation rubber composition that surrounds a bead core made of a steel wire bundle of a pneumatic tire, wherein 100 parts by weight of a rubber component is contained in a molecule containing 10% or more of a conjugated dienoic acid as a vulcanization accelerator. 0.1 to 2 organic unsaturated fatty acids having two or more carbon-carbon double bonds
A bead insulation rubber composition comprising 0 part by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5175712A JPH0726067A (en) | 1993-07-15 | 1993-07-15 | Bead insulation rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5175712A JPH0726067A (en) | 1993-07-15 | 1993-07-15 | Bead insulation rubber composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0726067A true JPH0726067A (en) | 1995-01-27 |
Family
ID=16000925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5175712A Pending JPH0726067A (en) | 1993-07-15 | 1993-07-15 | Bead insulation rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0726067A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008082590A3 (en) * | 2006-12-29 | 2008-09-12 | Bridgestone Firestone North Am | Tire bead insulation |
| JP2018069978A (en) * | 2016-10-31 | 2018-05-10 | 住友ゴム工業株式会社 | Rubber composition for sealant material |
| CN118126739A (en) * | 2024-02-05 | 2024-06-04 | 广州大港石油科技有限公司 | An environmentally friendly rubber plasticizer and its preparation method and application |
-
1993
- 1993-07-15 JP JP5175712A patent/JPH0726067A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008082590A3 (en) * | 2006-12-29 | 2008-09-12 | Bridgestone Firestone North Am | Tire bead insulation |
| US8136562B2 (en) | 2006-12-29 | 2012-03-20 | Bridgestone Firestone North American Tire, Llc | Tire bead insulation |
| JP2018069978A (en) * | 2016-10-31 | 2018-05-10 | 住友ゴム工業株式会社 | Rubber composition for sealant material |
| CN118126739A (en) * | 2024-02-05 | 2024-06-04 | 广州大港石油科技有限公司 | An environmentally friendly rubber plasticizer and its preparation method and application |
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