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Rubber composition for coating tire cord

A technology of rubber composition and tire cord, which is applied in the field of tire cord, can solve the problems of reduced rubber breaking strength, insufficient adhesion, etc., and achieve the effect of increasing breaking strength, improving wet and hot adhesion, and improving the environment

Inactive Publication Date: 2008-12-03
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a vulcanization accelerator has insufficient initial adhesion to the steel cord, and has little effect of restoring the adhesion to the steel cord during damp heat deterioration, so attempts have also been made to add resorcinol, a mixed crosslinking agent, or Improvement with a large amount of cobalt (Patent Document 2)
[0004] However, these attempts have the problem of not being able to obtain good adhesion under high-temperature vulcanization conditions when producing automobile tires, and being insufficient compared with DCBS.
There is also a problem that if a large amount of cobalt is used, the breaking strength of the rubber will decrease due to thermal oxidation deterioration, and if resorcinol is used, the breaking strength of the rubber will decrease

Method used

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  • Rubber composition for coating tire cord
  • Rubber composition for coating tire cord
  • Rubber composition for coating tire cord

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11 and comparative example 1-10

[0043] (Material)

[0044] NR: TSR20 (made in Thailand)

[0045] BR1250H: Polybutadiene rubber produced by Zeon Co., Ltd. (using lithium as an initiator to polymerize)

[0046] Carbon black N330: Carbon black N330 produced by Showa CABOT Co., Ltd.

[0047] Carbon black N326: carbon black N326 produced by Showa CABOT Co., Ltd.

[0048] Silica Z115G: Z115Gr produced by Rhodia

[0049] Silane coupling agent: Si69 produced by Deggusa

[0050] Cobalt stearate: cobalt stearate produced by Dainippon Ink Chemical Industry Co., Ltd.

[0051] Oil-treated insoluble sulfur: Crystex manufactured by Flexsys (contains 80% of insoluble sulfur and 20% of oil, and the mixing amount of the whole oil-treated insoluble sulfur containing oil is recorded in the table)

[0052] Vulcanization accelerator DCBS: Accel DZ-G (N, N-dicyclohexylbenzothiazole sulfenamide) produced by Kawaguchi Chemical Industry Co., Ltd.

[0053] Vulcanization accelerator BEHZ: BEHZ (N,N-bis(2-ethylhexyl)benzothiazole ...

Embodiment 12～21 and comparative example 11～19

[0081] (Production method)

[0082] Each chemical in the mixing content shown in Table 3 and Table 4 except sulfur and vulcanization accelerator was mixed in a Banbury mixer, and oil-treated insoluble sulfur and sulfur were added to the resulting mixed product. Various vulcanization accelerators are mixed in an open mill to obtain an unvulcanized rubber composition. This unvulcanized rubber composition was vulcanized under pressure at 150° C. for 30 minutes to obtain a vulcanized rubber sample. Regarding aromatic oil, anti-aging agent and zinc oxide, although there is no record in Table 3 and Table 4, they were mixed in all Examples and Comparative Examples with 2 parts by weight, 1 part by weight, and 10 parts by weight, vulcanization accelerator and DCBS Equimolar amounts were mixed.

[0083] The compositions obtained in Examples 12 to 21 and Comparative Examples 11 to 19 were evaluated in the same manner as the above test method. The respective test results are shown in ...

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Abstract

The object of the present invention is provide a rubber composition for coating a tire cord, which improves adhesion with a tire cord and has an effect of recovering adhesion with a tire cord at hygrothermal aging with maintaining the initial vulcanization rate. The present invention relates to a rubber composition for coating a tire cord comprising 0.7 to 3 parts by weight of benzothiazolyl sulfenamide or benzothiazolyl sulfenimide represented by the chemical formula (1): (wherein R1 is a linear alkyl group having a branched structure of 3 to 16 carbon atoms, and R2 is a linear alkyl group having a branched structure of 3 to 16 carbon atoms or a benzothiazolyl sulfide group) and 3 to 7 parts by weight of sulfur based on 100 parts by weight of a rubber component containing at least 60% by weight of a natural rubber and / or an isoprene rubber.

Description

technical field [0001] The present invention relates to a rubber composition for covering a tire cord and a tire cord covered with the rubber composition. Background technique [0002] Usually, tire cords are mostly arranged inside the tire. Since the rubber near the tire cord is located far away from the heat source in the tire vulcanization process, it is not easy to be vulcanized. Therefore, in order to promote vulcanization, N, N-dicyclohexyl-2- Benzothiazole sulfenamide (DCBS), etc. (Patent Document 1). [0003] It is also known to use other sulfenamide-based accelerators, thiazole-based accelerators, etc. instead of the above-mentioned DCBS. Such a vulcanization accelerator has insufficient initial adhesion to the steel cord, and has little effect of restoring the adhesion to the steel cord during damp heat deterioration, so attempts have also been made to add resorcinol, a mixed crosslinking agent, or A large amount of cobalt is used for improvement (Patent Documen...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L9/00C08K5/47C08K3/06D06M15/693D06M13/438D06M11/52D02G3/48
Inventor 宫崎达也
Owner SUMITOMO RUBBER IND LTD
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