JP2013249409A - Rubber composition - Google Patents

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JP2013249409A
JP2013249409A JP2012126150A JP2012126150A JP2013249409A JP 2013249409 A JP2013249409 A JP 2013249409A JP 2012126150 A JP2012126150 A JP 2012126150A JP 2012126150 A JP2012126150 A JP 2012126150A JP 2013249409 A JP2013249409 A JP 2013249409A
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rubber
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rubber composition
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JP5991855B2 (en
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Toshio Azechi
利夫 畦地
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a chloroprene-based rubber composition that can produce vulcanized rubber satisfying both low-temperature characteristics and mechanical strength.SOLUTION: A rubber composition comprises ≥50 pts.wt. of chloroprene rubber when the total amount of rubber components is 100 pts.wt. and ≥5 pts.wt. of a saturated aliphatic carboxylic acid that is represented by general formula (1): R-COOH (wherein Ris a saturated aliphatic group having 20 or more carbon atoms) and has a molecular weight of ≥300. The rubber composition comprises preferably 5-120 pts.wt. of at least one kind of carbon black and silica and 0.5-5 pts.wt. of a vulcanizing agent based on 100 pts.wt. of rubber components and the content of a plasticizer is preferably ≤20 pts.wt. based on 100 pts.wt. of the rubber components.

Description

本発明は、クロロプレンゴムを主成分とするゴム組成物に関する。   The present invention relates to a rubber composition containing chloroprene rubber as a main component.

近年、ゴム製品にはさらなる高機能化が要求されることが多く、例えば空気バネに代表されるゴム製品においては、耐オゾン性のさらなる向上が求められるため、ゴム成分としてクロロプレンゴムが採用されることが多い。しかしながら、クロロプレンゴムは他のゴム種と比べて、結晶化する温度が高く(結晶化温度−15℃程度)、ガラス転移温度(Tg=40℃)および低温衝撃脆化温度(Tb=−35℃)も高いため、天然ゴムなどと比較すると低温特性が劣ると言われている。近年、クロロプレンゴムを使用したゴム製品を、国内で冬季に想定される温度(10〜−20℃程度)よりも低い温度地域(−40〜−20℃程度の寒冷地)で使用する場合も想定されるため、かかる極低温領域でも低温特性が向上したクロロプレンゴム系ゴム組成物(温度依存性の低いもの)が要求されることが多い。しかしながら、前記のとおり−40〜−20℃程度の極低温領域はクロロプレンゴムのガラス転移温度(脆化温度)領域であるため、この温度領域でクロロプレンゴムの低温特性を維持することは容易ではない。   In recent years, rubber products are often required to have higher functionality. For example, in rubber products represented by air springs, further improvement in ozone resistance is required, so chloroprene rubber is employed as a rubber component. There are many cases. However, chloroprene rubber has a higher crystallization temperature (crystallization temperature of about −15 ° C.), glass transition temperature (Tg = 40 ° C.) and low temperature impact embrittlement temperature (Tb = −35 ° C.) than other rubber types. ) Is also high, and it is said that low temperature characteristics are inferior to natural rubber. In recent years, it is assumed that rubber products using chloroprene rubber are used in a temperature region (cold region of about -40 to -20 ° C) lower than the temperature assumed in winter (about 10 to -20 ° C) in Japan. Therefore, a chloroprene rubber-based rubber composition (having low temperature dependency) having improved low-temperature characteristics even in such an extremely low temperature region is often required. However, as described above, the extremely low temperature region of about −40 to −20 ° C. is the glass transition temperature (brittle temperature) region of chloroprene rubber, and it is not easy to maintain the low temperature characteristics of chloroprene rubber in this temperature region. .

ゴム製品の低温特性(温度依存性)を向上する方法として、例えばゴム組成物中に可塑剤を添加する方法が挙げられるが、この場合、引張強度(TB)などの機械的強度が悪化する傾向がある。つまり、クロロプレンゴム系ゴム組成物の低温特性と機械的強度とは二律背反の関係にあり、これらを両立することは非常に困難であるのが実情であった。   As a method for improving the low temperature characteristics (temperature dependency) of a rubber product, for example, there is a method of adding a plasticizer to a rubber composition. In this case, mechanical strength such as tensile strength (TB) tends to deteriorate. There is. That is, the low temperature characteristics and mechanical strength of the chloroprene rubber-based rubber composition are in a trade-off relationship, and it was actually difficult to achieve both.

下記特許文献1では、低温特性に優れたクロロプレンゴムを製造するために、クロロプレンゴム共重合体の乳化重合条件を最適化した製造方法が記載されている。しかしながら、市場においては、特殊な重合条件により製造されたクロロプレンゴムではなく、あくまでも汎用クロロプレンゴムを使用した系でも、その低温特性と機械的強度との両立が要求されているのが実情であった。   The following Patent Document 1 describes a production method in which emulsion polymerization conditions for a chloroprene rubber copolymer are optimized in order to produce a chloroprene rubber having excellent low-temperature characteristics. However, in the market, it is a fact that not only chloroprene rubber produced under special polymerization conditions but also a system using general-purpose chloroprene rubber is required to satisfy both low temperature characteristics and mechanical strength. .

特公平3−30609号公報Japanese Patent Publication No. 3-30609

本発明は上記実情に鑑みてなされたものであり、その目的は、低温特性と機械的強度とを両立した加硫ゴムを製造可能なクロロプレン系ゴム組成物を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a chloroprene rubber composition capable of producing a vulcanized rubber having both low temperature characteristics and mechanical strength.

上記目的は、下記の如き本発明により達成できる。即ち本発明は、ゴム成分の全量を100重量部としたとき、クロロプレンゴムを50重量部以上含有し、かつ以下の一般式(1):
−COOH (1)
(式(1)中、Rは炭素数が20以上の飽和脂肪族基)で表され、分子量が300以上の飽和脂肪族カルボン酸を5重量部以上含有することを特徴とするゴム組成物、に関する。
The above object can be achieved by the present invention as described below. That is, the present invention contains 50 parts by weight or more of chloroprene rubber when the total amount of the rubber component is 100 parts by weight, and the following general formula (1):
R 1 —COOH (1)
(In the formula (1), R 1 is a saturated aliphatic group having 20 or more carbon atoms) and contains 5 parts by weight or more of a saturated aliphatic carboxylic acid having a molecular weight of 300 or more. , Regarding.

上記ゴム組成物は、クロロプレンゴムを50重量部以上含有し、かつ特定の飽和脂肪族カルボン酸を含有するため、耐候性や耐油性に優れる一方で、低温特性に優れ、かつ機械的強度などのゴム物性の維持が可能である。   Since the rubber composition contains 50 parts by weight or more of chloroprene rubber and contains a specific saturated aliphatic carboxylic acid, it has excellent weather resistance and oil resistance, while having excellent low-temperature characteristics and mechanical strength. Rubber properties can be maintained.

上記ゴム組成物において、前記ゴム成分100重量部に対し、カーボンブラックおよびシリカの少なくとも1種を5〜120重量部、加硫剤を0.5〜5重量部含有することが好ましい。かかるゴム組成物の加硫ゴムでは、低温特性と機械的強度とをよりバランス良く向上することができる。   The rubber composition preferably contains 5 to 120 parts by weight of at least one of carbon black and silica and 0.5 to 5 parts by weight of a vulcanizing agent with respect to 100 parts by weight of the rubber component. In the vulcanized rubber of such a rubber composition, the low temperature characteristics and the mechanical strength can be improved in a balanced manner.

上記ゴム組成物において、前記ゴム成分100重量部に対し、可塑剤の含有量が20重量部以下であることが好ましい。一般に、ゴム組成物中に可塑剤を多く添加するほど、それに比例して低温特性は改良する傾向にあるが、添加量に比例して引張強度などの機械的強度は悪化する傾向にある。しかしながら、本発明に係るゴム組成物は特定の飽和脂肪族カルボン酸を含有するため、加硫ゴムの機械的強度の悪化に繋がる可塑剤の配合量を減らしつつ、低温特性を向上することができる。   In the rubber composition, the plasticizer content is preferably 20 parts by weight or less with respect to 100 parts by weight of the rubber component. Generally, the more the plasticizer is added to the rubber composition, the lower the temperature properties tend to improve in proportion thereto, but the mechanical strength such as tensile strength tends to deteriorate in proportion to the amount added. However, since the rubber composition according to the present invention contains a specific saturated aliphatic carboxylic acid, it is possible to improve the low temperature characteristics while reducing the amount of the plasticizer that leads to the deterioration of the mechanical strength of the vulcanized rubber. .

本発明に係るゴム組成物は、ゴム成分の全量を100重量部としたとき、クロロプレンゴム(以下、「CR」とも言う)を50重量部以上含有する。   The rubber composition according to the present invention contains 50 parts by weight or more of chloroprene rubber (hereinafter also referred to as “CR”) when the total amount of the rubber components is 100 parts by weight.

CRとしては、硫黄変性タイプ、非硫黄変性タイプ、耐結晶化タイプなどを特に限定なく使用することができる。   As the CR, a sulfur-modified type, a non-sulfur-modified type, a crystallization-resistant type, or the like can be used without particular limitation.

本発明に係るゴム組成物おいては、ゴム成分の全量を100重量部としたとき、CRを少なくとも50重量部以上含有する。ただし、特に耐熱性が要求される用途などでは、ゴム成分の全量を100重量部としたとき、CRを70重量部以上含有することが好ましく、80重量部以上含有することがより好ましい。   The rubber composition according to the present invention contains at least 50 parts by weight of CR when the total amount of rubber components is 100 parts by weight. However, in applications where heat resistance is particularly required, when the total amount of the rubber component is 100 parts by weight, it is preferable to contain 70 parts by weight or more, more preferably 80 parts by weight or more.

ゴム組成物中、CR以外のゴム成分を含有する場合、当業者に公知のジエン系ゴムを含有しても良い。かかるジエン系ゴムの例としては、天然ゴムまたはジエン系合成ゴムのいずれでも良い。ジエン系合成ゴムをブレンドする場合、ジエン系合成ゴムとしては、ポリイソプレンゴム(IR)、ポリブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、ブチルゴム(IIR)、アクリルニトリルブタジエンゴム(NBR)などが挙げられる。かかるジエン系合成ゴムの重合方法やミクロ構造は限定されず、これらのうちの1種または2種以上をブレンドして使用することができる。   When a rubber component other than CR is contained in the rubber composition, a diene rubber known to those skilled in the art may be contained. Examples of such diene rubbers may be natural rubber or diene synthetic rubber. When diene synthetic rubber is blended, polyisoprene rubber (IR), polybutadiene rubber (BR), styrene butadiene rubber (SBR), butyl rubber (IIR), acrylonitrile butadiene rubber (NBR), etc. are used as the diene synthetic rubber. Can be mentioned. The polymerization method and microstructure of such a diene synthetic rubber are not limited, and one or more of these can be blended and used.

本発明に係るゴム組成物おいては、クロロプレンゴムに加えて、下記一般式(1):
−COOH (1)
(式(1)中、Rは炭素数が20以上の飽和脂肪族基)で表され、分子量が300以上の飽和脂肪族カルボン酸を含有する。Rは炭素数が20以上である直鎖構造、分岐鎖構造または環状構造を有する飽和脂肪族基であり、好ましくは直鎖構造を有する飽和脂肪族基である。飽和脂肪族カルボン酸の具体例としては、例えばベヘニン酸などが挙げられる。ゴム組成物中の飽和脂肪族カルボン酸の含有量はゴム成分100重量部に対して5重量部以上である。含有量の上限としては、10重量部以下が好ましい。
In the rubber composition according to the present invention, in addition to the chloroprene rubber, the following general formula (1):
R 1 —COOH (1)
(In formula (1), R 1 is a saturated aliphatic group having 20 or more carbon atoms) and contains a saturated aliphatic carboxylic acid having a molecular weight of 300 or more. R 1 is a saturated aliphatic group having a straight chain structure, a branched chain structure or a cyclic structure having 20 or more carbon atoms, preferably a saturated aliphatic group having a straight chain structure. Specific examples of the saturated aliphatic carboxylic acid include behenic acid. The content of the saturated aliphatic carboxylic acid in the rubber composition is 5 parts by weight or more with respect to 100 parts by weight of the rubber component. The upper limit of the content is preferably 10 parts by weight or less.

本発明に係るゴム組成物おいては、可塑剤を配合しても良いが、加硫ゴムの機械的強度を維持するために、その配合量はゴム成分100重量部に対して20重量部以下であることが好ましく、15重量部以下であることがより好ましく、可塑剤を含まないことが特に好ましい。   In the rubber composition according to the present invention, a plasticizer may be blended, but in order to maintain the mechanical strength of the vulcanized rubber, the blending amount is 20 parts by weight or less with respect to 100 parts by weight of the rubber component. It is preferable that it is 15 parts by weight or less, and it is particularly preferable that no plasticizer is contained.

本発明で使用できる可塑剤としては、一般に通常のゴム工業において使用されるものを特に限定なく使用できるが、例えば、トリメチルホスフェート、トリブチルホスフェート、トリ−(2−エチルヘキシル)ホスフェート、トリブトキシエチルホスフェート、トリフェニルホスフェート、トリクレジルホスフェート、アルキルアリルホスフェート、トリエチルホスフェート、トリ(クロロエチル)ホスフェート、トリスジクロロプロピルホスフェート、トリス(β−クロロプロピル)ホスフェート、オクチルジフェニルホスフェート、トリス(イソプロピルフェニル)ホスフェート、クレジルフェニルホスフェートなどのリン酸エステル系可塑剤;ジオクチルフタレート、ジブチルフタレート、ジエチルフタレート、ブチルベンジルフタレート、ジ−2−エチルヘキシルフタレート、ジイソデシルフタレート、ジウンデシルフタレート、ジイソノニルフタレートなどのフタル酸エステル系可塑剤;トリメリット酸オクチルエステル、トリメリット酸イソノニルエステル、トリメリット酸イソデシルエステルなどのトリメリット酸エステル系可塑剤;ジペンタエリスリトールエステル系可塑剤;ジオクチルアジペート、ジ−2−エチルヘキシルアジペート、ジイソブチルアジペート、ジブチルアジペート、ジイソデシルアジペート、ジブチルジグリコールアジペート、ジ−2−エチルヘキシルアゼレート、ジオクチルセバケート、メチルアセチルリシノレートなどの脂肪酸エステル系可塑剤;ピロメリット酸オクチルエステルなどのピロメリット酸エステル系可塑剤、モノオレイン酸ポリエチレングリコール、モノステアリン酸ポリエチレングリコール、ジオレイン酸ポリエチレングリコール、ジステアリン酸エチレングリコールなどのエチレングリコール系可塑剤が挙げられる。   As the plasticizer that can be used in the present invention, those generally used in the ordinary rubber industry can be used without particular limitation. For example, trimethyl phosphate, tributyl phosphate, tri- (2-ethylhexyl) phosphate, tributoxyethyl phosphate, Triphenyl phosphate, tricresyl phosphate, alkylallyl phosphate, triethyl phosphate, tri (chloroethyl) phosphate, trisdichloropropyl phosphate, tris (β-chloropropyl) phosphate, octyl diphenyl phosphate, tris (isopropylphenyl) phosphate, cresylphenyl Phosphate ester plasticizers such as phosphate; dioctyl phthalate, dibutyl phthalate, diethyl phthalate, butyl benzyl phthalate Phthalate plasticizers such as di-2-ethylhexyl phthalate, diisodecyl phthalate, diundecyl phthalate, diisononyl phthalate; trimellit such as trimellitic acid octyl ester, trimellitic acid isononyl ester, trimellitic acid isodecyl ester Acid ester plasticizer; dipentaerythritol ester plasticizer; dioctyl adipate, di-2-ethylhexyl adipate, diisobutyl adipate, dibutyl adipate, diisodecyl adipate, dibutyl diglycol adipate, di-2-ethylhexyl azelate, dioctyl sebacate, Fatty acid ester plasticizers such as methylacetylricinoleate; pyromellitic acid ester plasticizers such as pyromellitic acid octyl ester, monooleic acid Examples include ethylene glycol plasticizers such as polyethylene glycol, polyethylene glycol monostearate, polyethylene glycol dioleate, and ethylene glycol distearate.

本発明に係るゴム組成物は、上述したゴム成分、飽和脂肪族カルボン酸、ジスルフィド化合物、可塑剤に加えて、カーボンブラック、シリカなどの充填剤、加硫剤および加硫促進剤、シラン系カップリング剤、亜鉛華、ステアリン酸、加硫促進助剤、加硫遅延剤、老化防止剤、ワックスやオイルなどの軟化剤、加工助剤などの通常ゴム工業で使用される配合剤を、本発明の効果を損なわない範囲において適宜配合し用いることができる。   In addition to the rubber component, saturated aliphatic carboxylic acid, disulfide compound, and plasticizer described above, the rubber composition according to the present invention includes a filler such as carbon black and silica, a vulcanizing agent and a vulcanization accelerator, and a silane cup. A compounding agent usually used in the rubber industry such as a ring agent, zinc white, stearic acid, vulcanization accelerating aid, vulcanization retarder, anti-aging agent, softener such as wax and oil, processing aid, etc. In the range which does not impair the effect of, it can mix | blend suitably and can be used.

本発明で用いられるカーボンブラックとしては特に限定されるものではないが、加硫後のゴムの硬度、補強性などを考慮した場合、HAF、FEF、GPF、SRFおよびFTが好ましい。また、シリカとしては通常のゴム工業で使用されるものを適宜使用可能である。さらに、本発明においては、カーボンブラックおよびシリカ以外の無機白色充填剤なども適量配合しても良い。ゴム組成物中のカーボンブラックおよび/またはシリカの含有量は、5〜120重量部であることが好ましく、20〜80重量部であることがより好ましく、30〜70重量部であることが特に好ましい。   The carbon black used in the present invention is not particularly limited, but HAF, FEF, GPF, SRF and FT are preferable in consideration of the hardness and reinforcement of the rubber after vulcanization. As silica, those used in the normal rubber industry can be used as appropriate. Further, in the present invention, an appropriate amount of inorganic white filler other than carbon black and silica may be blended. The content of carbon black and / or silica in the rubber composition is preferably 5 to 120 parts by weight, more preferably 20 to 80 parts by weight, and particularly preferably 30 to 70 parts by weight. .

加硫剤としては、通常のゴム用硫黄が例示され、例えば粉末硫黄、沈降硫黄、不溶性硫黄、高分散性硫黄などを用いることができる。加硫後の耐疲労性および耐熱性、あるいは他のゴム物性などを考慮した場合、ゴム成分100重量部に対する加硫剤の配合量は、0.5〜5重量部が好ましく、1〜3.5重量部であることがより好ましい。   Examples of the vulcanizing agent include ordinary sulfur for rubber, and for example, powdered sulfur, precipitated sulfur, insoluble sulfur, and highly dispersible sulfur can be used. When considering fatigue resistance and heat resistance after vulcanization or other rubber physical properties, the blending amount of the vulcanizing agent with respect to 100 parts by weight of the rubber component is preferably 0.5 to 5 parts by weight. More preferably, it is 5 parts by weight.

加硫促進剤としては、ゴム加硫用として通常用いられる、スルフェンアミド系加硫促進剤、チウラム系加硫促進剤、チアゾール系加硫促進剤、チオウレア系加硫促進剤、グアニジン系加硫促進剤、ジチオカルバミン酸塩系加硫促進剤などの加硫促進剤を単独、または適宜混合して使用しても良い。加硫後のゴム物性や耐久性などを考慮した場合、ゴム成分100重量部に対する加硫促進剤の配合量は、0.5〜5重量部が好ましく、1〜3.5重量部であることがより好ましい。   As the vulcanization accelerator, sulfenamide vulcanization accelerator, thiuram vulcanization accelerator, thiazole vulcanization accelerator, thiourea vulcanization accelerator, guanidine vulcanization, which are usually used for rubber vulcanization. Vulcanization accelerators such as accelerators and dithiocarbamate vulcanization accelerators may be used alone or in admixture as appropriate. In consideration of rubber physical properties and durability after vulcanization, the blending amount of the vulcanization accelerator with respect to 100 parts by weight of the rubber component is preferably 0.5 to 5 parts by weight, and 1 to 3.5 parts by weight. Is more preferable.

老化防止剤としては、ゴム用として通常用いられる、芳香族アミン系老化防止剤、アミン−ケトン系老化防止剤、モノフェノール系老化防止剤、ビスフェノール系老化防止剤、ポリフェノール系老化防止剤、ジチオカルバミン酸塩系老化防止剤、チオウレア系老化防止剤などの老化防止剤を単独、または適宜混合して使用しても良い。ゴム物性や耐久性などを考慮した場合、ゴム成分100重量部に対する老化防止剤の配合量は、2〜5重量部が好ましい。   As an anti-aging agent, an aromatic amine-based anti-aging agent, an amine-ketone anti-aging agent, a monophenol anti-aging agent, a bisphenol anti-aging agent, a polyphenol anti-aging agent, dithiocarbamic acid, which are usually used for rubber Anti-aging agents such as a salt-based anti-aging agent and a thiourea-based anti-aging agent may be used alone or in an appropriate mixture. In consideration of rubber properties and durability, the blending amount of the anti-aging agent with respect to 100 parts by weight of the rubber component is preferably 2 to 5 parts by weight.

本発明に係るゴム組成物は、上述したゴム成分、ジスルフィド化合物、飽和脂肪族カルボン酸、可塑剤に加えて、カーボンブラック、シリカなどの充填剤、加硫剤および加硫促進剤、シラン系カップリング剤、亜鉛華、ステアリン酸、加硫促進助剤、加硫遅延剤、老化防止剤、ワックスやオイルなどの軟化剤、加工助剤などの通常ゴム工業で使用される配合剤を、バンバリーミキサー、ニーダー、ロールなどの通常のゴム工業において使用される混練機を用いて混練りすることにより得られる。   The rubber composition according to the present invention includes a filler such as carbon black and silica, a vulcanizing agent and a vulcanization accelerator, a silane cup, in addition to the rubber component, disulfide compound, saturated aliphatic carboxylic acid, and plasticizer described above. Banbury mixers are usually used in the rubber industry, such as ring agents, zinc white, stearic acid, vulcanization accelerators, vulcanization retarders, anti-aging agents, softeners such as waxes and oils, and processing aids. It can be obtained by kneading using a kneader such as a kneader or roll used in a normal rubber industry.

また、上記各成分の配合方法は特に限定されず、硫黄および加硫促進剤などの加硫系成分以外の配合成分を予め混練してマスターバッチとし、残りの成分を添加してさらに混練する方法、ゴム成分およびカーボンブラックのみを予め混練マスターバッチとし、残りの成分を添加してさらに混練する方法、各成分を任意の順序で添加し混練する方法、全成分を同時に添加して混練する方法などのいずれでも良い。   In addition, the blending method of each of the above components is not particularly limited, and a blending component other than a vulcanizing component such as sulfur and a vulcanization accelerator is previously kneaded to obtain a master batch, and the remaining components are added and further kneaded. , Rubber component and carbon black only in advance as a kneading masterbatch, the remaining components are added and further kneaded, each component is added in any order and kneaded, all components are added simultaneously and kneaded, etc. Either of these is acceptable.

本発明に係るゴム組成物の加硫ゴムは、耐熱性および耐疲労性に特に優れる。このため、特に防振ゴム、空気ばね、またはホース用ゴムとして有用である。   The vulcanized rubber of the rubber composition according to the present invention is particularly excellent in heat resistance and fatigue resistance. For this reason, it is particularly useful as an anti-vibration rubber, an air spring, or a hose rubber.

以下、本発明の構成と効果を具体的に示す実施例などについて説明する。なお、実施例などにおける評価項目は下記のようにして測定を行った。   Hereinafter, examples and the like specifically showing the configuration and effects of the present invention will be described. In addition, the evaluation item in an Example etc. measured as follows.

(ゴム組成物の調製)
ゴム成分100重量部に対して、表1の配合処方に従い、実施例1および比較例1〜6のゴム組成物を配合し、通常のバンバリーミキサーを用いて混練し、ゴム組成物を調整した。表1に記載の各配合剤を以下に示す。
a)ゴム成分
クロロプレンゴム 「デンカクロロプレンDCR−36」、(電気化学工業社製)
天然ゴム(NR) 「RSS#3」
b)カーボンブラック GPF 「シーストV」、(東海カーボン社製)
c)酸化亜鉛 「亜鉛華3号」、(三井金属鉱業社製)
d)ステアリン酸 「工業用ステアリン酸」、(花王社製)
e)飽和脂肪族カルボン酸 ベヘニン酸(式(1)中のRは炭素数が21の飽和脂肪族基)、「ルナックBA」、(花王社製)
f)可塑剤 セバシン酸ジ2−エチルヘキシル、「DOS」、(田岡化学工業社製)
g)酸化マグネシウム 「キョーワマグ150」、(協和化学工業社製)
h)ワックス ミクロクリスタリンワックス
i)老化防止剤 「アンチゲン6C」、(住友化学社製)
j)硫黄 「5%オイル処理硫黄」、(細井化学工業社製)
k)加硫促進剤
「ノクセラーTS」、(大内新興化学工業社製)
「サンセラーDM−G」、(三新化学工業社製)
l)ジスルフィド化合物
(A)テトラキス(2−エチルヘキシル)チウラムジスルフィド(分子量636、RおよびRは同一で分子量286)、「ノクセラーTOT−N」、(大内新興化学工業社製)
(B)テトラベンジルチウラムジスルフィド(分子量544、RおよびRは同一で分子量240)、「サンセラーTBZTD」、(三新化学工業社製)
m)加硫遅延剤 「リターダーCTP」、(東レ・ファインケミカル社製)
(Preparation of rubber composition)
The rubber composition of Example 1 and Comparative Examples 1 to 6 was blended with 100 parts by weight of the rubber component according to the blending formulation of Table 1, and kneaded using a normal Banbury mixer to prepare a rubber composition. Each compounding agent described in Table 1 is shown below.
a) Rubber component
Chloroprene rubber “Denka Chloroprene DCR-36” (manufactured by Denki Kagaku Kogyo)
Natural rubber (NR) "RSS # 3"
b) Carbon Black GPF “Seast V” (manufactured by Tokai Carbon Co., Ltd.)
c) Zinc oxide “Zinc Hana 3” (Mitsui Mining & Mining)
d) Stearic acid "Industrial stearic acid" (manufactured by Kao Corporation)
e) Saturated aliphatic carboxylic acid behenic acid (R 1 in formula (1) is a saturated aliphatic group having 21 carbon atoms), “Lunac BA” (manufactured by Kao Corporation)
f) Plasticizer Di-2-ethylhexyl sebacate, “DOS” (manufactured by Taoka Chemical Industries)
g) Magnesium oxide “Kyowa Mug 150” (manufactured by Kyowa Chemical Industry Co., Ltd.)
h) Wax Microcrystalline wax i) Anti-aging agent “Antigen 6C” (manufactured by Sumitomo Chemical Co., Ltd.)
j) Sulfur “5% oil-treated sulfur” (made by Hosoi Chemical Co., Ltd.)
k) Vulcanization accelerator
"Noxeller TS" (made by Ouchi Shinsei Chemical Co., Ltd.)
"Sunseller DM-G" (manufactured by Sanshin Chemical Industry Co., Ltd.)
l) Disulfide compound (A) Tetrakis (2-ethylhexyl) thiuram disulfide (molecular weight 636, R 1 and R 2 are the same and molecular weight 286), “Noxeller TOT-N” (manufactured by Ouchi Shinsei Chemical Co., Ltd.)
(B) Tetrabenzylthiuram disulfide (molecular weight 544, R 1 and R 2 are the same and molecular weight 240), “Sunceller TBZTD” (manufactured by Sanshin Chemical Industry Co., Ltd.)
m) Vulcanization retarder “Retarder CTP” (manufactured by Toray Fine Chemical Co., Ltd.)

各ゴム組成物については、それぞれの加硫ゴムを作製して特性評価を行った。
(評価)
評価は、各ゴムを所定の金型を使用して150℃にて30分加熱、加硫して得られたゴムについて行った。
About each rubber composition, each vulcanized rubber was produced and the characteristic evaluation was performed.
(Evaluation)
The evaluation was performed on rubber obtained by heating and vulcanizing each rubber at 150 ° C. for 30 minutes using a predetermined mold.

<機械強度(引張特性(TB))>
JIS3号ダンベルを使用して作製したサンプルをJIS−K 6251に準拠して、引張強さ(T(MPa))を測定した。
<Mechanical strength (tensile properties (TB))>
A sample prepared using a JIS No. 3 dumbbell was measured for tensile strength (T B (MPa)) according to JIS-K 6251.

<低温特性(貯蔵弾性率(E’)の温度依存性)>
貯蔵弾性率E‘は、粘弾性スペクトロメーター(UBM製)を使用し、幅5mm、厚さ1mm、長さ20mmの試料について、初期歪3mm、周波数10Hzにて、測定される値である。温度依存性は{E’(−35℃)−E’(20℃)}/E’(20℃)計算値で評価し、数値が低いほど温度依存性が低く、低温特性が優れることを意味する。
<Low-temperature characteristics (temperature dependence of storage elastic modulus (E '))>
The storage elastic modulus E ′ is a value measured using a viscoelastic spectrometer (manufactured by UBM) at an initial strain of 3 mm and a frequency of 10 Hz for a sample having a width of 5 mm, a thickness of 1 mm, and a length of 20 mm. The temperature dependence is evaluated by the calculated value of {E ′ (−35 ° C.) − E ′ (20 ° C.)} / E ′ (20 ° C.). The lower the value, the lower the temperature dependence and the better the low temperature characteristics. To do.

Figure 2013249409
Figure 2013249409

表1の結果から、実施例1のゴム組成物の加硫ゴムでは、機械的強度に優れ、かつ低温特性にも優れることがわかる。   From the results in Table 1, it can be seen that the vulcanized rubber of the rubber composition of Example 1 is excellent in mechanical strength and low temperature characteristics.

Claims (4)

ゴム成分の全量を100重量部としたとき、クロロプレンゴムを50重量部以上含有し、かつ以下の一般式(1):
−COOH (1)
(式(1)中、Rは炭素数が20以上の飽和脂肪族基)で表され、分子量が300以上の飽和脂肪族カルボン酸を5重量部以上含有することを特徴とするゴム組成物。
When the total amount of the rubber component is 100 parts by weight, the chloroprene rubber is contained in an amount of 50 parts by weight or more, and the following general formula (1):
R 1 —COOH (1)
(In the formula (1), R 1 is a saturated aliphatic group having 20 or more carbon atoms) and contains 5 parts by weight or more of a saturated aliphatic carboxylic acid having a molecular weight of 300 or more. .
前記ゴム成分100重量部に対し、カーボンブラックおよびシリカの少なくとも1種を5〜120重量部、加硫剤を0.5〜5重量部含有する請求項1に記載のゴム組成物。   The rubber composition according to claim 1, comprising 5 to 120 parts by weight of at least one of carbon black and silica and 0.5 to 5 parts by weight of a vulcanizing agent with respect to 100 parts by weight of the rubber component. 前記ゴム成分100重量部に対し、可塑剤の含有量が20重量部以下である請求項1または2に記載のゴム組成物。   The rubber composition according to claim 1 or 2, wherein a content of the plasticizer is 20 parts by weight or less with respect to 100 parts by weight of the rubber component. 請求項1〜3のいずれかに記載のゴム組成物を加硫、成形して得られる加硫ゴム。   A vulcanized rubber obtained by vulcanizing and molding the rubber composition according to claim 1.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015060466A1 (en) * 2013-12-27 2015-04-30 住友電気工業株式会社 Cold-resistant rubber composition
JP2016011387A (en) * 2014-06-30 2016-01-21 横浜ゴム株式会社 Rubber composition and rubber product using the same
WO2021205753A1 (en) 2020-04-07 2021-10-14 デンカ株式会社 Rubber composition, vulcanized material, and molded article
WO2021215095A1 (en) 2020-04-21 2021-10-28 デンカ株式会社 Rubber composition, vulcanized material, and molded article

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JPH07292166A (en) * 1994-04-27 1995-11-07 Denki Kagaku Kogyo Kk Production of high-damping chloroprene rubber composition
JP2002146106A (en) * 2000-11-09 2002-05-22 Tokai Rubber Ind Ltd Seismic isolation rubber laminate
JP2005200609A (en) * 2004-01-19 2005-07-28 Toyo Tire & Rubber Co Ltd Highly damping rubber
JP2008255276A (en) * 2007-04-06 2008-10-23 Toyo Tire & Rubber Co Ltd Method for producing rubber composition and vibration-proof rubber

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Publication number Priority date Publication date Assignee Title
JPH07292166A (en) * 1994-04-27 1995-11-07 Denki Kagaku Kogyo Kk Production of high-damping chloroprene rubber composition
JP2002146106A (en) * 2000-11-09 2002-05-22 Tokai Rubber Ind Ltd Seismic isolation rubber laminate
JP2005200609A (en) * 2004-01-19 2005-07-28 Toyo Tire & Rubber Co Ltd Highly damping rubber
JP2008255276A (en) * 2007-04-06 2008-10-23 Toyo Tire & Rubber Co Ltd Method for producing rubber composition and vibration-proof rubber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015060466A1 (en) * 2013-12-27 2015-04-30 住友電気工業株式会社 Cold-resistant rubber composition
JP2016011387A (en) * 2014-06-30 2016-01-21 横浜ゴム株式会社 Rubber composition and rubber product using the same
WO2021205753A1 (en) 2020-04-07 2021-10-14 デンカ株式会社 Rubber composition, vulcanized material, and molded article
WO2021215095A1 (en) 2020-04-21 2021-10-28 デンカ株式会社 Rubber composition, vulcanized material, and molded article

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