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Rubber composition

一种橡胶组合物、天然橡胶的技术，应用在橡胶组合物领域，能够解决高发热化、难以充分得到耐破坏性、炭黑分散恶化等问题

Inactive Publication Date: 2008-01-16
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these have the disadvantages of causing deterioration of the dispersion of carbon black in the rubber, making it difficult to obtain sufficient crack growth resistance, and not only that, but also making it difficult to sufficiently obtain the desired effect of fracture resistance, and causing high heat generation.

Method used

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  • Rubber composition

Examples

Experimental program
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Effect test

Embodiment

[0034] Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[0035] In addition, various measurements in each Example and Comparative Example were performed as follows.

[0036] (1) Measurement of particle size distribution of carbon black in slurry solution (volume average particle diameter (mv), 90% by volume particle diameter (D90))

[0037] Measurement was performed using a laser diffraction particle size distribution meter (MICROTRAC FRA type) with a water solvent (refractive index: 1.33). The particle refractive index (Particle refractive index) used 1.57 in the whole measurement. In addition, in order to prevent reaggregation of carbon black, measurement was performed immediately after dispersion|distribution.

[0038] (2) CTAB specific surface area

[0039] Measured based on ISO 6810.

[0040] (3) 24M4DBP

[0041] Measured based on ISO 6894.

[0042] (4) Tinting power (TINT) ...

manufacture example 1

[0050] Production example 1 Production of carbon black

[0051] Carbon blacks C, D and E were produced under the production conditions shown in Table 1 using a general oil-furnace carbon black production apparatus. In addition, as the carbon black A (N326), "Asahi #70L" (trademark) manufactured by Asahi Carbon Co., Ltd. was used as the commercial item, and the commercially available Asahi Carbon Co., Ltd. was used as the carbon black B (N330). "Asahi #70" (trade mark).

[0052] Table 1

[0053] Carbon black type

manufacture example 2

[0054] Production Example 2 Production of Natural Rubber Latex

[0055] 1. Natural rubber latex 1

[0056] Fresh latex of natural rubber (rubber content 24.2%) was diluted with deionized water to prepare a latex with a rubber content of 20%.

[0057] 2. Natural rubber latex 2

[0058] Fresh latex of natural rubber (rubber content 24.2%) was diluted with deionized water to prepare a latex with a rubber content of 20%. Add 0.5% anionic surfactant (Demor N manufactured by Kao) and 0.1% alkaline protease (Alcalase 2.5L Type DX manufactured by Novozymes Co., Ltd.) to this latex, and stir at 40° C. for 8 hours to decompose the natural rubber. the amide bond.

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Abstract

A natural rubber wet masterbatch rubber composition comprising a mixture of a natural rubber latex with a slurry solution containing a carbon black dispersed therein, which satisfies the followings: (1) a CATB specific surface area (m<2> / g) in the range of 60 < CTAB < 110, (2) a 24M4DBP (m<3> / 100g) in the range of 55 < 24M4DBP < 75, (3) a CATB specific surface area and a tint strength (TINT) having the relationship of TINT > 0.41 x CTAB + 81, and (4) a compounding amount of 10 to 100 parts by mass relative to 100 parts by mass of natural rubber. The natural rubber wet masterbatch rubber composition can be suitably used for improving the resistance to fracture and to crack propagation of a tire, a steel coating rubber for a rubber product for industrial use, and the like.

Description

technical field [0001] The present invention relates to rubber compositions produced as natural rubber wet masterbatches. In more detail, the present invention relates to a natural rubber wet-process masterbatch composition, which does not impair low heat generation, has good damage resistance and crack growth resistance, and is suitable for steel wire coating for tires and the like. Background technique [0002] Traditionally, low-structure carbon blacks have been widely used in steel wire coatings for tires and industrial rubber products to improve damage resistance, and high fillers are often used to prevent rubber from being soft and easily deformed. All of these have the disadvantages of causing deterioration of the dispersion of carbon black in rubber, making it difficult to obtain sufficient crack growth resistance, and not only making it difficult to sufficiently obtain the desired effect of fracture resistance, but also causing high heat generation. [0003] On the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22C08L7/02C08K3/04
CPCC08J3/226C08J2407/00C08C1/04C08J2321/00C08K3/0033C08K3/04C08K3/013C08L21/00C08L7/00
Inventor 山田浩柳泽和宏
Owner BRIDGESTONE CORP
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