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Ethylene Bis-Stearamide as a Dispersing Agent in Rubber Compounds

by:Sainuo     2023-07-22


Ethylene bis-stearamide (EBS) is a widely used lubricant in rubber compounds or thermoplastic processing. It is a synthetic wax created by reacting two saturated fatty acids- stearyl and ethylenediamine. EBS is a versatile material that lends its physical and chemical properties to various domains, including food packaging, adhesives, cosmetics, and coatings.

In the rubber industry, EBS is an essential component as a dispersing agent that ensures uniform mixing of filler particles in the rubber matrix and stabilizes its complexing structure. This article will highlight the characteristics and applications of EBS as a dispersing agent in rubber processing.

What is a Dispersing Agent?

A dispersing agent is a material that is added to the rubber compound to improve the dispersion of fillers and other additives. Filler particles have a tendency to agglomerate or clump together, resulting in poor dispersion and reduced mechanical properties of the final product. A dispersing agent works by breaking down the agglomerates and maintaining a stable dispersion of the filler particles in the polymer matrix.

How Ethylene Bis-Stearamide works as a Dispersing Agent in Rubber Compounds?

EBS has several unique properties that make it an excellent dispersing agent in rubber compounds. These are:

1. Low Melt Viscosity: EBS has a low melt viscosity, which means that it melts quickly and easily during the mixing process. This property allows it to penetrate the filler particles and promote better dispersion.

2. High Melting Point: EBS has a high melting point, which means that it remains stable at high temperatures. This property prevents the agglomeration of filler particles during processing.

3. Polar Nature: EBS has a polar nature, which means that it can interact with other polar materials such as fillers and rubber. This property allows it to create a stable dispersion of filler particles in the rubber matrix.

4. Lubricating Action: EBS has a lubricating action that promotes the flow of the rubber compound during processing. This property allows for better mixing and dispersion of the filler particles.

Applications of EBS as a Dispersing Agent in Rubber Compounds:

EBS is widely used as a dispersing agent in various rubber compounds, including natural rubber (NR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), and ethylene-propylene diene rubber (EPDM). The applications of EBS in rubber processing are:

1. Improves Mechanical Properties: EBS as a dispersing agent improves the mechanical properties of rubber compounds, including tensile strength, elongation at break, and tear strength. It also enhances the compression set and abrasion resistance of the rubber product.

2. Stabilizes Complexing Structure: EBS enhances the stability of the complexing structure in rubber compounds. It prevents the filler particles from settling down during curing and ensures uniformity and consistency in the final product.

3. Cost-Effective: EBS is a cost-effective dispersing agent that is easy to handle and use. It requires low dosage levels, and its benefits can be achieved with small quantities.

4. Non-Toxic: EBS is a non-toxic dispersing agent that is safe for use in food packaging and other sensitive applications.

5. Improves Adhesion: EBS improves the adhesion of rubber to other materials, including textiles, metals, and plastics. This property makes it useful in the manufacture of various rubber products such as tires, hoses, and conveyor belts.


In conclusion, EBS is a versatile lubricant that serves as a dispersing agent in rubber compounds. Its unique properties, including low melt viscosity, high melting point, polar nature, and lubricating action, make it an excellent material for promoting uniform dispersion of filler particles in the rubber matrix. EBS enhances the mechanical properties of rubber compounds, stabilizes the complexing structure, is cost-effective, non-toxic, and improves adhesion. Its applications span across various industries, including food packaging, textiles, and automotive.

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