JP2591569B2 - Tread rubber composition - Google Patents
Tread rubber compositionInfo
- Publication number
- JP2591569B2 JP2591569B2 JP4271393A JP27139392A JP2591569B2 JP 2591569 B2 JP2591569 B2 JP 2591569B2 JP 4271393 A JP4271393 A JP 4271393A JP 27139392 A JP27139392 A JP 27139392A JP 2591569 B2 JP2591569 B2 JP 2591569B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- rubber
- rubber composition
- tread rubber
- 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.)
- Expired - Fee Related
Links
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- Tires In General (AREA)
- Silicon Compounds (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はトレッドゴム組成物に関
する。The present invention relates to a tread rubber composition.
【０００２】[0002]
【従来の技術】従来より、悪路用タイヤのトレッドゴム
では、耐カット性を向上させる目的でシリカを充填剤と
して使用することがよく知られている。しかし、従来の
シリカを用いると、使用中の繰り返し変形によって永久
変形を起こしやすいという問題があった。2. Description of the Related Art Hitherto, it has been well known that silica is used as a filler in a tread rubber for a bad road tire in order to improve cut resistance. However, when conventional silica is used, there is a problem that permanent deformation is likely to occur due to repeated deformation during use.
【０００３】[0003]
【発明が解決しようとする課題】本発明者らは、トレッ
ドゴム組成物におけるこれらの問題を解消するために鋭
意研究を重ねた。その結果、ゾルゲル法により作成した
特定のシリカを特定量用いると、その目的が達成できる
ことを見出し、本発明を完成するに至った。DISCLOSURE OF THE INVENTION The present inventors have made intensive studies to solve these problems in tread rubber compositions. As a result, it has been found that the purpose can be achieved by using a specific amount of a specific silica prepared by the sol-gel method, and the present invention has been completed.
【０００４】[0004]
【課題を解決するための手段】本発明は、基材ゴム１０
０重量部に対し、平均粒径が１０〜３０μmでかつ比表
面積が４００〜７００m2／gであるゾルゲル法により製
造された球状シリカを８〜２２重量部含有するトレッド
ゴム組成物を提供するものである。SUMMARY OF THE INVENTION The present invention relates to a base rubber
A tread rubber composition containing 8 to 22 parts by weight of spherical silica produced by a sol-gel method having an average particle diameter of 10 to 30 μm and a specific surface area of 400 to 700 m 2 / g with respect to 0 parts by weight. It is.
【０００５】本発明によれば、ゾルゲル法により作成し
た特定のシリカ(以下、特殊シリカという)を配合するこ
とにより、耐カット性を低下させることなしに耐永久変
形性を向上させたトレッドゴム組成物が得られる。According to the present invention, a tread rubber composition having improved permanent deformation resistance without lowering cut resistance by blending specific silica (hereinafter referred to as special silica) prepared by a sol-gel method. Things are obtained.
【０００６】本発明のフラップ用ゴム組成物に用いる基
材ゴムは特に限定するものではなく、例えば、従来より
ゴム組成物に用いられるものであってもよい。具体的に
は、天然ゴム、スチレン−ブタジエンゴム、ブタジエン
ゴム、イソプレンゴム、ニトリルゴム、エチレンゴム、
エチレンプロピレンゴム、ブチルゴム等が挙げられ、こ
れらの１種以上使用してもよい。特に好ましい基材ゴム
は天然ゴム、スチレン−ブタジエンゴム、ブタジエンゴ
ム、イソプレンゴムである。The base rubber used in the rubber composition for flaps of the present invention is not particularly limited, and may be, for example, those conventionally used in rubber compositions. Specifically, natural rubber, styrene-butadiene rubber, butadiene rubber, isoprene rubber, nitrile rubber, ethylene rubber,
Examples include ethylene propylene rubber and butyl rubber, and one or more of these may be used. Particularly preferred base rubbers are natural rubber, styrene-butadiene rubber, butadiene rubber and isoprene rubber.
【０００７】本発明において充填剤として添加される特
殊シリカは、ゾルゲル法によって作成された比表面積４
００〜７００m2／g、平均粒径１０〜３０μm、好ましく
は１５〜２７μm、吸油量(流動パラフィン)２２０ml／
１００g以上の球状シリカであり、具体的には、日鉄鉱
業社製の「スーパージル」等が挙げられる。前記物性を満
足しない特殊シリカを用いると、永久歪が大きくなり、
タイヤのトレッドパターンが潰れてトレッド幅が狭くな
り、好ましくない。特殊シリカの配合量は、基材ゴム成
分１００重量部に対して８〜２２重量部、好ましくは８
〜１８重量部である。８重量部より少ないと、耐カット
性の改善効果が顕著でなく、また、補強性も十分でな
い。２２重量部を越えると、永久変形(圧縮永久歪)が大
きくなり、実用性に問題がある。[0007] The special silica added as a filler in the present invention has a specific surface area of 4 prepared by the sol-gel method.
00 to 700 m 2 / g, average particle size 10 to 30 μm, preferably 15 to 27 μm, oil absorption (liquid paraffin) 220 ml / g
It is a spherical silica of 100 g or more, specifically, "Super Jill" manufactured by Nippon Steel Mining Co., Ltd. and the like. If special silica that does not satisfy the above physical properties is used, the permanent set increases,
This is undesirable because the tread pattern of the tire is crushed and the tread width is reduced. The amount of the special silica is 8 to 22 parts by weight, preferably 8 to 22 parts by weight based on 100 parts by weight of the base rubber component.
１８18 parts by weight. If the amount is less than 8 parts by weight, the effect of improving the cut resistance is not remarkable, and the reinforcing property is not sufficient. If it exceeds 22 parts by weight, permanent deformation (compression set) becomes large, and there is a problem in practicality.
【０００８】補強剤として添加されるカーボンブラック
は、例えば、昭和キャボット社、三菱化成社、東海カー
ボン社から市販のＨＡＦ、ＩＳＡＦ、ＳＡＦ等が一般に
使用できる。カーボンブラックの添加量は、基材ゴム成
分１００重量部に対して４０〜６０重量部、好ましくは
４２〜５７重量部である。４０重量部より少ないと、補
強性が不充分であり、６０重量部を越えると、固くなり
すぎて走行時の石等による外傷でトレッドゴムが欠け易
くなってしまう。As the carbon black added as a reinforcing agent, for example, HAF, ISAF, SAF, etc. commercially available from Showa Cabot Co., Mitsubishi Kasei Co., Ltd., Tokai Carbon Co., Ltd. can be generally used. The addition amount of carbon black is 40 to 60 parts by weight, preferably 42 to 57 parts by weight, based on 100 parts by weight of the base rubber component. When the amount is less than 40 parts by weight, the reinforcing property is insufficient, and when the amount is more than 60 parts by weight, the rubber becomes too hard, and the tread rubber tends to be chipped due to damage caused by stones or the like during running.
【０００９】加硫剤としては、一般的に硫黄が用いら
れ、その配合量は、基材ゴム成分１００重量部に対して
０.４〜１.３重量部である。０.４重量部より少ない
と、混練工程で分散のばらつきが生じやすく、得られる
物性がばらつく。１.３重量部を越えると、架橋密度が
高くなりすぎて悪路でチッピングを起こしやすくなり、
悪路耐久性が悪くなる。As a vulcanizing agent, sulfur is generally used, and its compounding amount is 0.4 to 1.3 parts by weight based on 100 parts by weight of the base rubber component. When the amount is less than 0.4 part by weight, dispersion of dispersion is likely to occur in the kneading step, and obtained physical properties vary. If the amount exceeds 1.3 parts by weight, the crosslink density becomes too high and chipping easily occurs on a rough road,
Bad road durability deteriorates.
【００１０】加硫促進剤としては、例えば、ＭＯＲ等が
挙げられ、その配合量は、基材ゴム成分１００重量部に
対して１.２〜２.２重量部である。１.２重量部より少
ないと、走行によるトレッドの発熱が大きくなり、２.
２重量部を越えると、悪路耐久性が悪くなる。[0010] Examples of the vulcanization accelerator include MOR and the like, and the compounding amount is 1.2 to 2.2 parts by weight based on 100 parts by weight of the base rubber component. If the amount is less than 1.2 parts by weight, the heat generated by the tread during traveling increases, and
If the amount exceeds 2 parts by weight, the durability on rough roads deteriorates.
【００１１】加硫剤の配合量が加硫促進剤の配合量に比
べて多いと、熱によるトレッドゴムの耐久性が悪くな
り、使用中のゴム物性の変化が大きくなる。そのため、
加硫剤の配合量は加硫促進剤の配合量に比べて少ないこ
とが必要である。When the amount of the vulcanizing agent is larger than the amount of the vulcanizing accelerator, the durability of the tread rubber due to heat is deteriorated, and the change in the rubber properties during use is increased. for that reason,
It is necessary that the compounding amount of the vulcanizing agent is smaller than the compounding amount of the vulcanization accelerator.
【００１２】さらに、本発明のゴム組成物には、添加剤
としてオイル、着色剤、老化防止剤等を配合してもよ
い。Further, the rubber composition of the present invention may contain additives such as oil, colorant and antioxidant.
【００１３】本発明のトレッドゴム組成物は、前記成分
をニーダーやバンバリー等を用いて混練した後、所定形
状にし、加硫成形することにより製造できる。混練およ
び加硫条件は公知である。The tread rubber composition of the present invention can be produced by kneading the above-mentioned components using a kneader or a banbury, etc., forming the mixture into a predetermined shape, and vulcanizing. Kneading and vulcanizing conditions are known.
【００１４】[0014]
【実施例】つぎに、実施例および比較例を挙げて本発明
をさらに詳しく説明する。 実施例１〜３および比較例１〜４ 表１に示す充填剤を用い、表２に示す処方に従って、常
法により混練し、所定形状にし、加硫成形(１４１℃×
６０分間)してゴム組成物を得た。これらを用いてつぎ
の項目について評価した。結果を図１および図２に示
す。Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. Examples 1 to 3 and Comparative Examples 1 to 4 Using the fillers shown in Table 1, according to the formulation shown in Table 2, kneading was carried out by a conventional method to obtain a predetermined shape, and vulcanization molding (141 ° C ×
(60 minutes) to obtain a rubber composition. Using these, the following items were evaluated. The results are shown in FIG. 1 and FIG.
【００１５】(評価方法)試験サンプルの評価はつぎの方
法で行った。 圧縮永久歪率:ＪＩＳＫ６３０１に従い、各ゴム組成物
のサンプル(直径２９.０mm×厚さ１２.７０mmの直円柱)
に７０℃の温度で圧縮し、２２時間後に荷重を除去した
後、３０分後にサンプルの厚さを測定し、残留する厚さ
の減少と最初の厚さとの百分比を求め、圧縮永久歪率
(％)とした。(Evaluation method) The evaluation of the test sample was performed by the following method. Compression set: According to JIS K6301, a sample of each rubber composition (a right circular cylinder having a diameter of 29.0 mm and a thickness of 12.70 mm)
After compressing at a temperature of 70 ° C., removing the load after 22 hours, measuring the thickness of the sample after 30 minutes, determining the percentage of the decrease in the remaining thickness and the initial thickness, and calculating the compression set
(%).
【００１６】引裂強さ:ＪＩＳＫ６３０１に従い、Ａ形
ダンベルを用いて引裂強さ(kg／cm)の測定を行った。Tear strength: The tear strength (kg / cm) was measured using an A-shaped dumbbell according to JIS K6301.
【００１７】耐カット性:鋭利な刃をつけた振子式試験
機を用い、一定のエネルギーでサンプルに刃を衝突させ
た時のサンプルへの刃の侵入深さを測定し、比較例３の
サンプルを１００とした時の指数に換算した。指数は小
さい方が良好である。Cut resistance: Using a pendulum-type testing machine equipped with a sharp blade, the depth of penetration of the blade into the sample when the blade collides with the sample with a constant energy was measured. Was converted to an index when 100 was taken. The smaller the index, the better.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【表２】 [Table 2]
【００２０】図１および図２から明らかなように、実施
例１〜３(特殊シリカ含有量８〜２２重量部)のゴム組成
物は比較例１〜４に比べて圧縮永久歪率、引裂強さ、耐
カット指数のすべての点で優れている。As is apparent from FIGS. 1 and 2, the rubber compositions of Examples 1 to 3 (special silica content: 8 to 22 parts by weight) were higher in compression set and tear strength than Comparative Examples 1 to 4. Excellent in all aspects of cut resistance index.
【００２１】[0021]
【発明の効果】本発明によれば、耐カット性および耐永
久変形性に優れたトレッドゴム組成物が得られる。According to the present invention, a tread rubber composition having excellent cut resistance and permanent deformation resistance can be obtained.
【図１】 特殊シリカ量と圧縮永久歪率の関係を示すグ
ラフである。FIG. 1 is a graph showing the relationship between the amount of special silica and the compression set.
【図２】 特殊シリカ（従来のシリカ）量と引張強さ、
引裂強さおよび耐カット指数の関係を示すグラフであ
る。Fig. 2 Amount of special silica (conventional silica) and tensile strength,
4 is a graph showing the relationship between tear strength and cut resistance index.
Claims (2)
が１０〜３０μmでかつ比表面積が４００〜７００m2／g
であるゾルゲル法により製造された球状シリカを８〜２
２重量部含有するトレッドゴム組成物。1. An average particle diameter of 10 to 30 μm and a specific surface area of 400 to 700 m 2 / g based on 100 parts by weight of a base rubber.
8 to 2 of spherical silica produced by the sol-gel method
A tread rubber composition containing 2 parts by weight.
び１.２〜２.２重量部の加硫促進剤を含有し、加硫剤の
含有量が加硫促進剤の含有量よりも少ない請求項１記載
のトレッドゴム組成物。2. The composition further comprises 0.4 to 1.3 parts by weight of a vulcanizing agent and 1.2 to 2.2 parts by weight of a vulcanizing accelerator, wherein the content of the vulcanizing agent is The tread rubber composition according to claim 1, wherein the content is less than the content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4271393A JP2591569B2 (en) | 1992-10-09 | 1992-10-09 | Tread rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4271393A JP2591569B2 (en) | 1992-10-09 | 1992-10-09 | Tread rubber composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06116440A JPH06116440A (en) | 1994-04-26 |
| JP2591569B2 true JP2591569B2 (en) | 1997-03-19 |
Family
ID=17499443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4271393A Expired - Fee Related JP2591569B2 (en) | 1992-10-09 | 1992-10-09 | Tread rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2591569B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01111114A (en) * | 1987-10-23 | 1989-04-27 | Mitsubishi Heavy Ind Ltd | Premixing burner |
| IT1290083B1 (en) * | 1997-03-14 | 1998-10-19 | Pirelli | LOW WORKING TEMPERATURE TIRE |
| US6313220B1 (en) | 2000-03-03 | 2001-11-06 | Thierry Florent Edme Materne | Preparation of reinforced elastomer, elastomer composite, and tire having component thereof |
| US6359034B1 (en) | 2000-03-09 | 2002-03-19 | The Goodyear Tire & Rubber Company | Preparation of elastomer reinforced with in situ formed silica and tire having component thereof |
| JP5612243B2 (en) * | 2007-07-25 | 2014-10-22 | 住友ゴム工業株式会社 | Rubber composition for tire and pneumatic tire |
-
1992
- 1992-10-09 JP JP4271393A patent/JP2591569B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06116440A (en) | 1994-04-26 |
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