What is the use of magnesium oxide in rubber?

What is the use of magnesium oxide in rubber?

Magnesium oxide is commonly used in the rubber industry as an acid acceptor and as a filler. It plays a crucial role in improving the processing and performance characteristics of rubber compounds.

Step 1: Acid Acceptor.

Magnesium oxide acts as an acid acceptor in rubber compounds, especially those based on halogenated polymers like chloroprene rubber (CR) and chlorinated polyethylene (CPE). These polymers release hydrogen chloride (HCl) during processing or service, which can lead to degradation of the rubber. Magnesium oxide reacts with HCl to form magnesium chloride, preventing the acid from attacking the polymer chains and preserving the integrity of the rubber compound.

Step 2: Filler.

In addition to its role as an acid acceptor, magnesium oxide is also used as a filler in rubber formulations. It helps to improve the physical properties of the rubber, such as tensile strength, tear resistance, and abrasion resistance. By incorporating magnesium oxide into the rubber compound, manufacturers can achieve the desired balance of properties for specific applications.

Step 3: How it works.

When magnesium oxide is added to rubber compounds, it interacts with the polymer chains and forms strong bonds. This improves the overall structure of the rubber, enhancing its mechanical properties and durability. Magnesium oxide also helps to improve the dispersion of other fillers and additives in the rubber matrix, leading to more uniform properties throughout the material.

Overall, magnesium oxide plays a critical role in enhancing the performance of rubber compounds by acting as an acid acceptor and filler. Its ability to react with acids and improve the physical properties of rubber makes it an essential ingredient in the formulation of various rubber products.

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