JP2008297513A - Rubber composition for tire tread - Google Patents
Rubber composition for tire tread Download PDFInfo
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- JP2008297513A JP2008297513A JP2007147879A JP2007147879A JP2008297513A JP 2008297513 A JP2008297513 A JP 2008297513A JP 2007147879 A JP2007147879 A JP 2007147879A JP 2007147879 A JP2007147879 A JP 2007147879A JP 2008297513 A JP2008297513 A JP 2008297513A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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Abstract
Description
本発明は、タイヤトレッド用ゴム組成物に関し、更に詳細には、ゴムの転がり抵抗を低減しつつ、加硫速度を向上させたタイヤトレッド用ゴム組成物に関する。 The present invention relates to a rubber composition for a tire tread, and more particularly, to a rubber composition for a tire tread in which the vulcanization speed is improved while reducing the rolling resistance of rubber.
従来より、タイヤの転がり抵抗とウェット性能を向上させるために、シリカ配合トレッドゴムが使われている。しかしながら、かかるシリカ配合ゴムでは、加硫が遅くなり、生産性が悪化するという問題がある。更に、現在では、環境衛生上の問題から、更なる転がり抵抗の低減が求められている。 Conventionally, silica compounded tread rubber has been used to improve tire rolling resistance and wet performance. However, such a silica-containing rubber has a problem that vulcanization is delayed and productivity is deteriorated. Furthermore, at present, further reduction in rolling resistance is required due to environmental health problems.
従来、シリカ配合系ゴム組成物におけるシリカ分散剤として尿素などを用いることが以下の特許文献1に提案され、知られているが、かかるシリカ配合系ゴム組成物にアルキル尿素を加えて、加硫速度を向上させ、かつ転がり抵抗を低減させる技術は、未だ知られていない。 Conventionally, the use of urea or the like as a silica dispersant in a silica compounded rubber composition has been proposed and known in Patent Document 1 below, and an alkylurea is added to such a silica compounded rubber composition and vulcanized. A technique for increasing the speed and reducing the rolling resistance is not yet known.
本発明では、シリカ配合系ゴム組成物に所定のアルキル尿素を配合することによって、当該ゴムの加硫速度を向上させると共に、転がり抵抗を低減させたタイヤトレッド用ゴム組成物を提供することを目的とする。 An object of the present invention is to provide a rubber composition for a tire tread that improves the vulcanization speed of the rubber and reduces the rolling resistance by blending a predetermined alkylurea with a silica-blended rubber composition. And
本発明によれば、ガラス転移温度(Tg)が0〜−40℃の硫黄加硫可能なジエン系ゴム50〜100重量部を含むジエン系ゴム100重量部に対して、シリカ10〜150重量部及び以下の一般式(1)又は(2):
で表されるアルキル尿素0.5〜10重量部を配合してなるタイヤトレッド用ゴム組成物が提供される。
According to the present invention, 10 to 150 parts by weight of silica with respect to 100 parts by weight of diene rubber including 50 to 100 parts by weight of diene rubber capable of sulfur vulcanization having a glass transition temperature (Tg) of 0 to −40 ° C. And the following general formula (1) or (2):
The rubber composition for tire treads which mix | blends 0.5-10 weight part of alkyl urea represented by these is provided.
本発明では、シリカ配合系のタイヤトレッド用ゴム組成物について、加硫速度の向上と、特に転がり抵抗の点で改良することを目指して、鋭意好適な配合剤を探索していたところ、この度、かかる配合剤として、所定量のアルキル尿素をシリカの配合時に添加することによって、これらの特性を向上できることを見出したものである。 In the present invention, the silica compounded rubber composition for tire treads was searched for a suitable compounding agent with the aim of improving the vulcanization rate and particularly improving the rolling resistance. As such a compounding agent, it has been found that these characteristics can be improved by adding a predetermined amount of alkylurea when compounding silica.
即ち、本発明では、ガラス転移温度(Tg)が0〜−40℃の硫黄加硫可能なジエン系ゴム50〜100重量部を含むジエン系ゴム100重量部に対して、シリカ10〜150重量部及び以下の一般式(1)又は(2):
で表されるアルキル尿素0.5〜10重量部を配合することによって、加硫速度の向上と、転がり抵抗の低減が同時に可能となるものである。
That is, in the present invention, 10 to 150 parts by weight of silica with respect to 100 parts by weight of diene rubber containing 50 to 100 parts by weight of sulfur vulcanizable diene rubber having a glass transition temperature (Tg) of 0 to -40 ° C. And the following general formula (1) or (2):
By adding 0.5 to 10 parts by weight of the alkyl urea represented by the formula, it is possible to simultaneously improve the vulcanization speed and reduce the rolling resistance.
本発明のタイヤトレッド用ゴム組成物で用いられるジエン系ゴムとしては、ガラス転移温度(Tg)が0〜−40℃の硫黄加硫可能なジエン系ゴムを50〜100重量部含むジエン系ゴムが100重量部の量で使用される。当該タイヤトレッド用ゴム組成物において、ガラス転移温度(Tg)が0〜−40℃のジエン系ゴムが50重量部未満の場合には、タイヤトレッド用ゴムとして必要な摩擦力が得られない。また、ガラス転移温度(Tg)が−40℃未満のジエン系ゴムでは、グリップ力が低下するため好ましくなく、逆に0℃を超えると、低温で硬くなり、グリップ力が低下するため好ましくない。 Examples of the diene rubber used in the rubber composition for a tire tread of the present invention include a diene rubber containing 50 to 100 parts by weight of a sulfur vulcanizable diene rubber having a glass transition temperature (Tg) of 0 to −40 ° C. Used in an amount of 100 parts by weight. In the tire tread rubber composition, when the diene rubber having a glass transition temperature (Tg) of 0 to −40 ° C. is less than 50 parts by weight, the frictional force necessary for the tire tread rubber cannot be obtained. Further, a diene rubber having a glass transition temperature (Tg) of less than −40 ° C. is not preferable because the grip force is lowered, and conversely, if it exceeds 0 ° C., it becomes hard at a low temperature and the grip force is lowered.
本発明のタイヤ用トレッドゴムに使用されるジエン系ゴムには、例えば、天然ゴム(NR)、イソプレンゴム(IR)、各種ブタジエンゴム(BR)、各種スチレン−ブタジエン共重合体ゴム(SBR)、アクリロニトリル−ブタジエン共重合体ゴム(NBR)、クロロプレンゴム、エチレン−プロピレン−ジエン共重合体ゴム、スチレン−イソプレン共重合体ゴム、スチレン−イソプレン−ブタジエン共重合体ゴム、イソプレン−ブタジエン共重合体ゴムなどが挙げられ、これらのジエン系ゴムは単独で、あるいは二種以上のブレンドゴムとして使われる。かかるジエン系ゴムのうち、単独で上記ガラス転移温度(Tg)0〜−40℃を有するものは単独で使用することができ、また、単独では上記ガラス転移温度を有しないものは、二種以上のブレンドゴムが上記温度範囲の平均ガラス転移温度(平均Tg)となるように配合したブレンドゴムとして使われる。 Examples of the diene rubber used in the tire tread rubber of the present invention include natural rubber (NR), isoprene rubber (IR), various butadiene rubbers (BR), various styrene-butadiene copolymer rubbers (SBR), Acrylonitrile-butadiene copolymer rubber (NBR), chloroprene rubber, ethylene-propylene-diene copolymer rubber, styrene-isoprene copolymer rubber, styrene-isoprene-butadiene copolymer rubber, isoprene-butadiene copolymer rubber, etc. These diene rubbers are used alone or as a blend rubber of two or more. Among such diene rubbers, those having the above glass transition temperature (Tg) 0 to −40 ° C. can be used alone, and those having no such glass transition temperature alone are two or more. The blend rubber is used as a blend rubber formulated so as to have an average glass transition temperature (average Tg) in the above temperature range.
ここで、前記した平均ガラス転移温度(平均Tg)とは、ゴムの種類をn、各ゴムのガラス転移温度をTi(℃)、各ゴムの配合量(全ゴムポリマーの100重量部に対する重量部)をQiとすると、下記式によって算出することができる。
本発明のタイヤトレッド用ゴム組成物に配合使用される補強性充填剤としては、前記ジエン系ゴム100重量部に対してシリカが10〜150重量部、好ましくは30〜120重量部の量で使用される。そして、本発明のタイヤトレッド用ゴム組成物に配合して用いられるシリカとしては、特に、BET比表面積が100〜300m2/g(ISO 5794に従って測定)である微細なシリカが好適に使用される。また、当該シリカの配合量が10重量部未満であると、本発明における配合剤のアルキル尿素の効果が十分に発揮されず、逆に150重量部を超えると、加工性が悪化するので好ましくない。 As the reinforcing filler used in the tire tread rubber composition of the present invention, silica is used in an amount of 10 to 150 parts by weight, preferably 30 to 120 parts by weight, based on 100 parts by weight of the diene rubber. Is done. The silica used in the tire tread rubber composition of the present invention is particularly preferably fine silica having a BET specific surface area of 100 to 300 m 2 / g (measured according to ISO 5794). . In addition, if the amount of silica is less than 10 parts by weight, the effect of alkylurea as a compounding agent in the present invention is not sufficiently exerted. On the other hand, if it exceeds 150 parts by weight, workability deteriorates, which is not preferable. .
本発明のタイヤトレッド用ゴム組成物に配合使用されるアルキル尿素としては、前記ジエン系ゴム100重量部に対して、一般式(1)又は(2):
で表されるアルキル尿素が0.5〜10重量部、好ましくは1〜6重量部の配合量で用いられる。当該アルキル尿素が0.5重量部未満では、加硫速度の向上効果が不十分であり、逆に10重量部を超えるとスコーチが速くなり過ぎるため好ましくない。そして、当該アルキル尿素は、液体であるか、あるいは融点が140℃以下の粉末状であることが、ゴムへの分散性が向上し、加硫速度の向上効果が大きいため好ましい。
The alkylurea used in the tire tread rubber composition of the present invention is represented by the general formula (1) or (2) with respect to 100 parts by weight of the diene rubber:
Is used in an amount of 0.5 to 10 parts by weight, preferably 1 to 6 parts by weight. If the alkyl urea is less than 0.5 parts by weight, the effect of improving the vulcanization rate is insufficient, and conversely if it exceeds 10 parts by weight, the scorch becomes too fast, which is not preferable. The alkylurea is preferably in the form of a liquid or a powder having a melting point of 140 ° C. or lower because the dispersibility in rubber is improved and the effect of improving the vulcanization rate is great.
本発明に係るタイヤトレッド用ゴム組成物には、更に、通常の加硫又は架橋剤、加硫又は架橋促進剤、各種オイル、老化防止剤、充填剤、可塑剤、その他タイヤゴム用に配合されている各種配合剤を配合することができ、かかる配合剤は、一般的な方法で混練してゴム組成物とし、加硫または架橋することができる。これら配合剤の配合量も、本発明の目的に反しない限り、従来の一般的な配合量とすることができる。 The rubber composition for a tire tread according to the present invention is further blended for ordinary vulcanization or crosslinking agents, vulcanization or crosslinking accelerators, various oils, anti-aging agents, fillers, plasticizers, and other tire rubbers. Various compounding agents can be blended, and these compounding agents can be kneaded by a general method to obtain a rubber composition, which can be vulcanized or crosslinked. The compounding amounts of these compounding agents can be set to conventional general compounding amounts as long as the object of the present invention is not violated.
以下、実施例及び比較例によって本発明を更に説明するが、本発明の技術的範囲をこれらの実施例に限定するものでないことは言うまでもない。 EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further, it cannot be overemphasized that the technical scope of this invention is not limited to these Examples.
サンプルの調製
表1に示す配合(重量部)に従って、硫黄及び加硫促進剤1及び2を除くゴム、シリカ、アルキル尿素などの各配合成分を、それぞれ1.7Lの密閉式バンバリーミキサーに装填して5分間混合して得られたマスターバッチを、8×16インチのオープンロールミルに投入し、これに前記の硫黄と加硫促進剤を配合、混合してゴム組成物を得た。この未加硫ゴム組成物の一部を用いて、以下の加硫速度試験に供した。次いで、残部の未加硫ゴム組成物を所定の金型中で、160℃、20分間プレス加硫して試験サンプル(ゴムシート)を作製し、以下の転がり抵抗試験に供した。
Sample preparation According to the formulation (parts by weight) shown in Table 1, each component such as rubber, silica, alkylurea, etc., excluding sulfur and vulcanization accelerators 1 and 2, was loaded into a 1.7 L closed banbury mixer. The master batch obtained by mixing for 5 minutes was put into an 8 × 16 inch open roll mill, and the above-mentioned sulfur and vulcanization accelerator were blended and mixed to obtain a rubber composition. A part of this unvulcanized rubber composition was used for the following vulcanization rate test. Next, the remaining unvulcanized rubber composition was press vulcanized at 160 ° C. for 20 minutes in a predetermined mold to prepare a test sample (rubber sheet), which was subjected to the following rolling resistance test.
試験方法
1)加硫速度試験: JIS 6300に準拠して、振動式ディスク加硫試験機にて、振幅1度、160℃で95%の加硫度に達する時間(T95、分)を測定した。
2)転がり抵抗試験: JIS K6394に準拠して、(株)東洋精機製作所製の粘弾性スペクトロメーターを用いて、初期歪=10%、振幅=±2%、周波数=20Hzの条件下でtanδ(60℃)を測定し、この値をもって転がり抵抗を評価した。
Test method 1) Vulcanization rate test: Based on JIS 6300, the time (T95, minutes) to reach a vulcanization degree of 95% at an amplitude of 1 degree and 160 ° C. was measured with a vibration type disk vulcanization tester. .
2) Rolling resistance test: In accordance with JIS K6394, using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho Co., Ltd., under the conditions of initial strain = 10%, amplitude = ± 2%, frequency = 20 Hz, 60 ° C.) and the rolling resistance was evaluated with this value.
実施例1〜4及び比較例1
結果を、以下の表1に示す。
The results are shown in Table 1 below.
表1の結果から、ゴム組成物に所定配合量のシリカとアルキル尿素を配合した実施例1〜4のゴム組成物では、転がり抵抗が低減し、かつ加硫速度が大幅に向上していることが分かる。 From the results shown in Table 1, in the rubber compositions of Examples 1 to 4 in which a predetermined amount of silica and alkylurea are blended with the rubber composition, the rolling resistance is reduced and the vulcanization speed is greatly improved. I understand.
よって、本発明のゴム組成物は、これをタイヤトレッド用ゴム組成物として利用すれば極めて有用である。 Therefore, the rubber composition of the present invention is extremely useful when used as a rubber composition for tire treads.
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JP2007147879A JP5493250B2 (en) | 2007-06-04 | 2007-06-04 | Rubber composition for tire tread |
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JP2007147879A JP5493250B2 (en) | 2007-06-04 | 2007-06-04 | Rubber composition for tire tread |
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Cited By (1)
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JP2012224685A (en) * | 2011-04-15 | 2012-11-15 | Yokohama Rubber Co Ltd:The | Rubber composition |
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WO1997035918A2 (en) * | 1996-06-26 | 1997-10-02 | Bridgestone Corporation | Rubber compositions |
JPH1129659A (en) * | 1997-07-11 | 1999-02-02 | Bridgestone Corp | Rubber composition |
JP2000053807A (en) * | 1998-02-06 | 2000-02-22 | Pirelli Pneumatici Spa | Vulcanizable rubber composition for use especially in tread having low rolling resistance for automobile tire |
JP2000313772A (en) * | 1999-03-03 | 2000-11-14 | Bridgestone Corp | Rubber composition and its production |
JP2001172432A (en) * | 1999-12-15 | 2001-06-26 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
JP2002220492A (en) * | 2001-01-24 | 2002-08-09 | Yokohama Rubber Co Ltd:The | Production method of rubber composition for tire |
JP2004276686A (en) * | 2003-03-13 | 2004-10-07 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
JP2006089693A (en) * | 2004-09-27 | 2006-04-06 | Yokohama Rubber Co Ltd:The | Silica-compounded rubber composition |
JP2006241315A (en) * | 2005-03-03 | 2006-09-14 | Yokohama Rubber Co Ltd:The | Rubber composition for pneumatic tire |
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2007
- 2007-06-04 JP JP2007147879A patent/JP5493250B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997035918A2 (en) * | 1996-06-26 | 1997-10-02 | Bridgestone Corporation | Rubber compositions |
JPH1129659A (en) * | 1997-07-11 | 1999-02-02 | Bridgestone Corp | Rubber composition |
JP2000053807A (en) * | 1998-02-06 | 2000-02-22 | Pirelli Pneumatici Spa | Vulcanizable rubber composition for use especially in tread having low rolling resistance for automobile tire |
JP2000313772A (en) * | 1999-03-03 | 2000-11-14 | Bridgestone Corp | Rubber composition and its production |
JP2001172432A (en) * | 1999-12-15 | 2001-06-26 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
JP2002220492A (en) * | 2001-01-24 | 2002-08-09 | Yokohama Rubber Co Ltd:The | Production method of rubber composition for tire |
JP2004276686A (en) * | 2003-03-13 | 2004-10-07 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
JP2006089693A (en) * | 2004-09-27 | 2006-04-06 | Yokohama Rubber Co Ltd:The | Silica-compounded rubber composition |
JP2006241315A (en) * | 2005-03-03 | 2006-09-14 | Yokohama Rubber Co Ltd:The | Rubber composition for pneumatic tire |
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JP2012224685A (en) * | 2011-04-15 | 2012-11-15 | Yokohama Rubber Co Ltd:The | Rubber composition |
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