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Blocked mercaptosilane coupling agent

A technology of mercaptosilane, methyl, applied in the field of reinforcing inorganic fillers and diene elastomers, which can solve the problems of premature vulcanization, impossible operation and industrial processing of rubber compositions, high viscosity, etc.

Active Publication Date: 2014-08-27
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, it was found that the specific removal of zinc oxide from rubber compositions reinforced with inorganic fillers (such as silica) is extremely detrimental to the processing characteristics ("processability") of the rubber composition in the green state, the scorch time The reduction is absolutely unacceptable from an industrial point of view
It should be borne in mind that during the preparation of rubber compositions in a mixer, the phenomenon of "scorch" quickly leads to premature vulcanization ("scorch"), to very high viscosities in the green state and finally to almost impossible handling and Rubber compositions for industrial processing

Method used

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  • Blocked mercaptosilane coupling agent
  • Blocked mercaptosilane coupling agent
  • Blocked mercaptosilane coupling agent

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Embodiment Construction

[0035] I. Measurements and Tests Used

[0036] The rubber compositions in which the coupling agents were tested were characterized before and after curing as described below.

[0037] I-1. Tensile test

[0038] These tensile tests make it possible to determine elastic stress and fracture properties. These tests were performed according to the French standard NF T46-002, September 1988, unless otherwise indicated. Nominal secant modulus (or apparent stress in MPa) at 100% elongation (denoted as M100) and at 300% elongation (M300) in the second elongation (i.e. at the measured after an adaptation cycle at the elongation rate).

[0039] I-2. Kinetic properties

[0040] The kinetic properties ΔG* and tan(δ) were measured on a viscosity analyzer (Metravib VA4000) according to standard ASTM D5992-96 max. Samples of vulcanized compositions (thickness 4mm, cross-section 400mm 2 The response of the cylindrical sample). A strain amplitude sweep was performed from 0.1% to 50...

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Abstract

The invention relates to a blocked mercaptosilane having the following general formula I: (HO)R1 2Si-Z-S-C(=O)-A in which: - the symbols R1, which may be identical or different, are each a monovalent hydrocarbon-based group chosen from linear or branched alkyls, cycloalkyls or aryls, having from 1 to 18 carbon atoms; - the symbol A is hydrogen or a monovalent hydrocarbon-based group chosen from linear or branched alkyls, cycloalkyls or aryls, having from 1 to 18 carbon atoms, and linear or branched alkoxyalkyls having from 2 to 8 carbon atoms; - the symbol Z is a divalent linker group comprising from 1 to 18 carbon atoms.

Description

technical field [0001] The present invention relates to mercaptosilane coupling agents which can be used in particular for coupling reinforcing inorganic fillers and diene elastomers in rubber compositions intended, for example, for the manufacture of tyres. Background technique [0002] It is generally known that in order to obtain the best reinforcing properties imparted by fillers, it is appropriate that the fillers be present in the elastomeric matrix in the final form which is as fine and as uniformly distributed as possible. In practice, such conditions can only be achieved if the filler, on the one hand, shows an excellent ability to incorporate into the matrix and deagglomerate during mixing with the Excellent ability to describe the matrix. [0003] In a well-known manner, carbon black exhibits this capability, which is generally not the case for inorganic fillers. This is because inorganic filler particles have an unfavorable tendency to agglomerate together in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/18C07F7/08C08K3/36C08K5/548C08L9/00
CPCC08K5/548C08K7/14C08L9/06C07F7/0836C08L21/00
Inventor K·隆尚邦J·C·阿劳约达席尔瓦N·西博思
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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