Method for preparing substantially spherical reaction compound of sulfur-containing silane and carbon black and product prepared by method

Abstract

The invention provides a method for preparing a substantially spherical reaction compound of sulfur-containing silane and carbon black. Sulfur-containing silane and carbon black used for rubber are used as raw materials, the raw materials are firstly mixed to form spherical pre-mixed particles by a conical single-spiral reaction mixer, a reaction compound is formed under vacuum, and then sifting is conducted through a vibrating sieve to obtain the spherical particular reaction compound having a certain particle diameter. The method has the advantages that production equipment is simple, sulfur-containing silane and carbon black are in sufficient contact for a reaction, the particle size is appropriate, and the use dispersing property and the use effect are good. The reaction compound is applicable to preparation of carbon black particle materials for tire rubber recently and suitable for large-scale industrial production.

Description

technical field [0001] The present invention generally relates to silane coupling agents, and in particular, the present invention relates to methods for preparing substantially spherical reactive complexes of sulfur-containing silanes and carbon black, and complexes prepared by said methods. Background technique [0002] Carbon black is an agglomerate with a specific structure formed by the agglomeration of many near-nano-scale carbon black primary particles. and other reactive groups. In the existing rubber industry, carbon black is often used as a reinforcing material for rubber, which can be used to improve the tensile strength, tear strength and wear resistance of tire rubber. In tire rubber, if carbon black is directly mixed with rubber compound, the compatibility is poor due to the large difference in properties such as the surface polarity of the two. In order to improve the compatibility of carbon black and rubber compound, the common practice in the industry is t...

AI Technical Summary

Problems solved by technology

First of all, the particles of the mixture produced by this method are relatively large, which is determined by the nature of extrusion granulation, so it is not easy to disperse when it is mixed with the rubber compound in the internal mixer, resulting in a long time for mixing Second, in order to maintain the stability of the product's shape and structure, it usually adds a small amount of binder or special polymer to the formula, and these additives have potential adverse effects on the composition and structure of rubber kneading products; again, In the process of screw extrusion, due to the high temperature and fast speed of the mixed material, it is easy to cause the hydrolysis and crosslinking of the sulfur-containing silane itself, and at the same time reduce the condensation reaction amount of the sulfur-containing silane and carbon black, thereby reducing its coupling effect

Finally, in the process of screw extrusion and granulation, the pressure on the carbon black material is also relatively high, which easily destroys the particle structure of the carbon black aggregates and reduces the reinforcing effect of the carbon black.

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