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Ethylene Bis-Stearamide: The Secret to Improving Color Dispersion in Plastics

by:Sainuo     2023-07-24

Ethylene Bis-Stearamide: The Secret to Improving Color Dispersion in Plastics

When it comes to plastic manufacturing, achieving consistent color dispersion can be a challenge. Uneven pigmentation can result in a lackluster appearance, costing companies both time and money. Ethylene Bis-Stearamide (EBS) is a widely-used additive that has been shown to improve color dispersion in plastics. In this article, we'll explore the properties of EBS and its effectiveness in enhancing color distribution in plastics.

Understanding Ethylene Bis-Stearamide

EBS is a synthetic wax that is often used as a slip agent in plastics. It is derived from two compounds: ethylene diamine and stearic acid. This mixture of a fatty acid and an amine gives EBS its unique properties. The resulting wax is hard, tough, and has a high melting point. It also has a low coefficient of friction, making it an effective lubricant.

EBS is available in powder, flake, and bead form, varying in melting point from 139°C to 145°C. Its primary function in plastics is to improve slip resistance, mold release, and anti-blocking properties. EBS is also known to enhance impact resistance and reduce friction during processing.

Enhancing Color Dispersion in Plastics

One of the most significant challenges in plastic manufacturing is achieving consistent coloring. The uniform distribution of color can be difficult to achieve, particularly in molded or extruded products. Uneven pigmentation can occur for many reasons, including improper mixing, uneven cooling, or low-quality pigments.

Color dispersion can be improved by adding a color masterbatch to the plastic mixture. However, the effectiveness of this method is limited, particularly if the base resin is incompatible with the masterbatch. It is at this point that EBS comes into play. By introducing EBS into the mix, manufacturers can achieve improved color distribution with little to no effect on other compound properties.

How EBS Affects Plastic Properties

EBS works by reducing surface tension, thereby allowing the pigments to spread more easily throughout the polymer matrix. It also improves lubrication, which can help to reduce melt viscosity, allowing for easier processing. The result is a product that is more resistant to scratching, surface scuffing, or other mechanical abrasions.

EBS also has a significant effect on the mechanical properties of plastics. It can create a more homogeneous blend of the polymer, resulting in increased tensile and flexural strength. It can also reduce the brittleness of certain plastics, making them less likely to break or crack. Additionally, EBS can improve the chemical resistance of plastics to certain solvents, acids, and oils.

The Benefits of Using EBS in Plastics

Using EBS in plastics manufacturing offers many benefits, including:

1. Improved color distribution: As we've discussed, EBS ensures that the pigments are dispersed evenly throughout the polymer matrix, resulting in a consistent coloration.

2. Reduced wear and tear: EBS acts as a lubricant, reducing the friction and wear on processing equipment, molds, and extruders. This reduction in wear and tear can increase equipment life and reduce downtime.

3. Enhanced strength: EBS can increase the mechanical strength of plastics, making them more robust and better suited to handling heavy use.

4. Improved chemical resistance: EBS has been shown to improve the chemical resistance of plastics, making them more resistant to a wide range of solvents, acids, and oils.

5. Cost-effectiveness: Using EBS is often more cost-effective than using other additives, as it does not require a significant investment in new equipment or processing techniques.

Potential Drawbacks of Using EBS in Plastics

As with any additive, there are potential drawbacks to using EBS in plastic manufacturing. Some of the most significant concerns include:

1. Over-addition: Adding too much EBS can result in negative impacts on the plastic's properties, such as reduced flexibility or cold flow.

2. Compatibility: EBS may not be compatible with all types of resins, particularly those that are highly polar or have a low melting point.

3. Residual amounts: Residual amounts of EBS may remain on the plastic's surface, leading to staining or discoloration.

4. Migration: EBS can migrate from the plastic's surface, which can impact the performance of other materials in contact with the plastic.


In conclusion, EBS is a highly effective additive for improving color dispersion in plastics. Its unique properties make it an excellent slip agent, mold release, and lubricant, as well as enhancing the mechanical properties of plastics. The addition of EBS can result in cost savings, improved equipment life, and higher-quality end products. However, as with any additive, it is essential to consider its potential drawbacks and ensure that the chemical is used appropriately.

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