Die Rolle von Magnesiumoxid in Reifen

Die Rolle von Magnesiumoxid in Reifen

1. Regulating Vulcanization Reaction and Optimizing Vulcanization Performance

• Vulcanization Activation and Promotion: Magnesium oxide can work synergistically with vulcanizing agents (such as sulfur) and accelerators in rubber formulations to activate the vulcanization system, accelerate the vulcanization reaction rate, shorten the vulcanization time, and improve production efficiency. At the same time, it can increase the vulcanization cross-linking density, making rubber molecules form a more stable three-dimensional network structure, thereby enhancing the strength, elasticity, and wear resistance of tire rubber.
• Anti-Scorch Protection: During rubber mixing and molding, magnesium oxide can inhibit premature vulcanization (known as “scorching”), preventing rubber from curing in advance due to temperature rise during the processing stage. This ensures the molding stability of various tire components (such as tread, sidewall, and cord layer) and reduces the rejection rate.

2. Neutralizing Acidic Substances and Protecting Rubber Performance

• Tire rubber (especially materials like butyl rubber and halogenated butyl rubber used in inner tubes or inner liners) may generate trace acidic substances (such as hydrogen halide) due to thermal decomposition during processing or use. As an acid neutralizer, magnesium oxide can effectively absorb these acidic components, preventing them from corroding rubber molecular chains or damaging the metal framework materials (such as steel cords) inside the tire. This maintains the chemical stability and durability of the rubber, extending the service life of the tire.

3. Enhancing Mechanical Properties and Durability of Rubber Materials

• Improving Heat Resistance and Anti-Aging Performance: The addition of magnesium oxide can enhance the thermal-oxidative aging resistance of rubber, making tires less prone to hardening, cracking, or loss of elasticity due to thermal degradation during high-temperature driving (such as long-term high-speed operation). This is particularly significant for parts of the tire that directly bear friction and high temperatures, such as the tread and buffer layer.
• Enhancing Adhesion Performance: In parts of the tire where the cord layer, belt layer, usw., are combined with framework materials (steel wires, fibers), magnesium oxide can strengthen the adhesion between rubber and framework materials, preventing delamination or peeling, and improving the structural integrity and impact resistance of the tire.

4. Adapting to Targeted Requirements of Different Tire Components

• Carcass and Cord Layer: By optimizing vulcanization and enhancing adhesion, the fatigue strength of the carcass is improved to adapt to repeated deformation during vehicle driving.
• Inner Liner: Utilizing its acid-neutralizing ability and chemical stability, it ensures the airtightness of the inner liner (reducing air leakage) and resists erosion from internal gases and external environments.
• Buffer Layer: Adjusts the vulcanization speed to match the processing technology, and at the same time improves the toughness of the material to alleviate stress transmission between the tread and the carcass.

Summary