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Diene rubber composition for tyre including a silica as a reinforcing filler

A technology of silica and diene rubber, applied in special tires, tire parts, transportation and packaging, etc., can solve problems such as difficult processing, poor dispersion of fillers, increased interaction, etc.

Inactive Publication Date: 2011-01-26
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersibility of fillers as well as the increase in their specific surface area are considered contradictory properties
This is because the high specific surface presumably increases the interaction between fillers, thus causing poor dispersion of fillers in the elastomer matrix and difficult processing

Method used

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  • Diene rubber composition for tyre including a silica as a reinforcing filler
  • Diene rubber composition for tyre including a silica as a reinforcing filler
  • Diene rubber composition for tyre including a silica as a reinforcing filler

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] I. Measurements and Tests Used

[0061] I.1 Characterization of silica

[0062] The silica was characterized as follows.

[0063] I.1.1 Specific Surface

[0064] In the following explanations, the CTAB specific surface is the external surface, which can be determined according to the following method derived from the standard NF ISO 5794-1 (February 2006, 2nd printing 2006-03).

[0065] in principle

[0066] Under magnetic stirring, the silica was brought into contact with a solution of cetyltrimethylammonium bromide (or cetyltrimethylammonium bromide), commonly known as CTAB. The adsorbed CTAB layer is proportional to the specific surface area of ​​silica.

[0067] The silica and remaining CTAB solution were separated. Excess CTAB was titrated with a solution of bis(2-ethylhexyl)sodium sulfosuccinate, commonly known as OT, up to the point of maximum turbidity.

[0068] The outer surface of the silica can be determined by the amount of CTAB (in square meters ...

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Abstract

The invention relates to a diene rubber composition for a tyre that comprises at least: (i) a diene elastomer; (ii) a mineral reinforcing filler; (iii) a binding agent ensuring the bond between the mineral filler and the elastomer; wherein said mineral filler includes at least one silica that may be obtained by the preparation method of the type that comprises reacting a silicate with an acidification agent, thereby providing a silica suspension, and separating and drying said suspension, characterised in that the reaction of the silicate with the acidification agent comprises the following consecutive steps: (i) contacting (mixing) an aqueous suspension of precipitated silica having a pH of between 2.5 and 5.3 with the acidification agent and silicate so that the pH of the reaction medium is maintained between 2.5 and 5.3; and (ii) adding silicate to the obtained reaction medium in order to increase the pH of the reaction medium up to a value between 4.7 and 6.3.

Description

technical field [0001] The present invention relates to diene rubber compositions reinforced with inorganic fillers for use in the manufacture of tires or semi-finished tires, in particular treads for these tires. Background technique [0002] It is known that in tire treads, in order to obtain the maximum reinforcing properties that a filler can impart and thus high wear resistance, it is generally recommended that the filler be present in the elastomeric matrix in the final form that is as fine and evenly distributed as possible. In fact, this condition can only be achieved if the filler exhibits a very good ability (on the one hand, to be incorporated into the matrix and to deagglomerate during the mixing of the elastomer, and, on the other hand, to be dispersed homogeneously in the matrix). [0003] In a known manner, carbon black exhibits this ability, which is generally not the case with inorganic fillers, especially silica. This is because, due to mutual affinity, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00C08K3/36C08K9/02
CPCC08K5/548C08K9/02B60C1/0016C08K3/36C08L21/00B60C1/00C08L9/00
Inventor D·托马森E·阿拉因J·赫南德斯
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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