Cyclododecasulfur Vulcanizing Agent 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 interply adhesion and article quality, requiring restrictive temperature controls that slow manufacturing speed and reduce profitability.
Innovation Solution
A vulcanizing composition using a cyclododecasulfur compound with a higher melt point onset of 155° C. to 167° C., allowing for increased processing temperatures and reduced premature conversion, thereby improving thermal stability and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric sulfur is used as a vulcanizing agent, then the elastomeric formulation achieves effective vulcanization, but the formulation is prone to premature conversion to cyclooctasulfur and sulfur bloom due to thermal instability during processing
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 a higher melting point (155-167°C vs. lower for polymeric sulfur) and reduced premature conversion to cyclooctasulfur, thereby improving thermal stability while maintaining vulcanization effectiveness.
2Manufacturing precision
If restrictive temperature controls are implemented to prevent premature conversion and sulfur bloom, then article quality is maintained, but manufacturing speed decreases and profitability is reduced
Solution Approach 1:
The patent changes the thermal stability parameter of the vulcanizing agent by using cyclododecasulfur compound instead of polymeric sulfur. This allows the formulation to withstand higher processing temperatures (up to 155-167°C and above) without premature conversion, thereby increasing manufacturing speed while maintaining article quality through reduced sulfur bloom.
3Productivity
If processing temperatures are increased to improve manufacturing speed, then productivity increases, but premature conversion to cyclooctasulfur occurs leading to sulfur bloom and reduced interply adhesion
Solution Approach 1:
The patent changes the thermal stability parameter of the vulcanizing agent system by implementing cyclododecasulfur compound. This parameter change raises the temperature threshold for conversion, allowing processing at higher temperatures (above 155-167°C) that increase manufacturing speed while preventing sulfur bloom by keeping cyclooctasulfur concentrations below the solubility limit.
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 use of cyclododecasulfur enables higher processing temperatures, reducing the risk of sulfur bloom and enhancing the quality and durability of vulcanized articles while increasing manufacturing speed and flexibility.
Implementation Method 1
the cyclododecasulfur compound is characterized by a melt point onset of from about 155° C. to about 167° C.
Implementation Method 2
a vulcanizable elastomeric formulation that includes the vulcanizing agent dispersed in the elastomeric compound
Implementation Method 3
the polymeric sulfur converts to cyclooctasulfur (S8), a sulfur allotrope that is soluble in elastomers and oils and which therefore dissolves into the elastomeric formulation wherein it can take part in the vulcanization reactions
Data Source
AI summary
Processes for forming a vulcanizable elastomeric formulation are disclosed. The processes include the steps of mixing an elastomer with a vulcanizing agent to form a vulcanizable elastomeric formulation that includes the vulcanizing agent dispersed in the elastomeric compound, wherein the vulcanizing agent includes a cyclododecasulfur compound. A process for forming a vulcanized elastomeric article is also described.