ylivulkanisaation

Ylivulkanisaation, also known as overvulcanization, refers to a process in rubber manufacturing where the vulcanization reaction proceeds beyond the optimal point. Vulcanization is a chemical process that converts natural rubber or polymers into more durable materials by adding sulfur or other equivalent curatives or accelerators. This cross-linking process improves the rubber's elasticity, resilience, and strength.

In ylivulkanisaation, excessive heating or prolonged exposure to vulcanizing agents leads to an over-formation of cross-links between polymer chains. This can result in a rubber product that is harder, more brittle, and less elastic than intended. The material may also exhibit reduced tensile strength and a tendency to crack or degrade more quickly under stress or thermal cycling. The exact temperature and time required for ylivulkanisaation depend on the specific rubber compound and the vulcanizing system used.

Detecting ylivulkanisaation typically involves testing the physical properties of the vulcanized rubber. Changes in hardness, modulus, elongation at break, and resilience can indicate that the material has been over-cured. In some cases, the process can be irreversible, meaning the rubber cannot be reprocessed to achieve the desired properties. Therefore, careful control of vulcanization time and temperature is crucial in rubber production to achieve optimal performance and avoid ylivulkanisaation.