Cyclododecasulfur Vulcanizing Composition Thermal Stability
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Solution Overview
Problem
Current sulfur vulcanization processes face challenges with polymeric sulfur's thermal instability, leading to premature conversion to cyclooctasulfur and sulfur bloom, which affects adhesion and quality of vulcanized articles, requiring stringent temperature control and limiting manufacturing speed and efficiency.
Innovation Solution
A vulcanizing composition incorporating a cyclododecasulfur compound with a melt point onset of 155° C. to 167° C., offering improved thermal stability and reduced propensity for premature conversion, allowing higher processing temperatures and increased manufacturing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric sulfur is used as a vulcanizing agent, then the vulcanization process can proceed, but premature conversion to cyclooctasulfur occurs leading to sulfur bloom and reduced adhesion
Solution Approach 1:
The patent changes the molecular structure parameter of the sulfur vulcanizing agent from polymeric sulfur to cyclododecasulfur compound. This structural parameter change results in elevated melting point (155-167°C) and improved thermal stability, preventing premature conversion to cyclooctasulfur and eliminating sulfur bloom while maintaining vulcanization effectiveness.
2Reliability
If temperature control is limited to below 100°C to prevent premature conversion, then sulfur bloom is avoided, but manufacturing speed and productivity are reduced
Solution Approach 1:
The patent changes the thermal parameter of the vulcanizing agent by using cyclododecasulfur compound with melting point of 155-167°C. This parameter change allows processing at higher temperatures (above 100°C) without premature conversion to cyclooctasulfur, thereby eliminating sulfur bloom while enabling faster manufacturing speeds and improved productivity.
3Manufacturing precision
If extended processing times are used to ensure complete mixing and shaping, then product quality is improved, but the risk of premature polymeric sulfur conversion increases
Solution Approach 1:
The patent changes the thermal stability parameter of the vulcanizing agent to cyclododecasulfur compound with elevated melting point (155-167°C). This parameter change allows extended processing times at higher temperatures without premature conversion, enabling complete mixing and shaping operations while maintaining vulcanizing agent stability and achieving high product quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cyclododecasulfur compound enhances thermal stability, reducing the risk of sulfur bloom and enabling higher processing temperatures, thus improving manufacturing efficiency and product quality by maintaining stability during the vulcanization process.
Implementation Method 1
the cyclododecasulfur compound is characterized by a melt point onset of from about 155° C. to about 167° C. when measured according to the well-established method of differential scanning calorimetry
Data Source
AI summary
A vulcanizing composition useful for the vulcanization of vulcanizable formulations is disclosed. The vulcanizing composition includes a vulcanizing agent which in turn includes a cyclododecasulfur compound. A cyclododecasulfur compound characterized by a DSC melt point onset of between 155° C. and 167° C. when measured at a DSC heat rate of 20° C./minute is also disclosed.