Non-Sulfur Silane Coupling for Stable Silica-Filled Rubber
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Solution Overview
Problem
Conventional sulfur-containing silane coupling agents for silica-filled rubber compounds are costly and require specific temperature conditions for silanization, leading to potential thermal degradation and scorching, necessitating the development of alternative techniques for incorporating silica fillers into polymer compositions.
Innovation Solution
A non-active sulfur containing silane coupling agent is used, which undergoes a siloxyl condensation reaction with a silane functionalized diene elastomer to form a silica-silane-polymer interphase, eliminating the need for sulfur and allowing for improved processability and dispersion of silica in rubber compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional sulfur-containing silane coupling agents are used, then silica dispersion in rubber is improved, but cost increases and thermal degradation occurs
Solution Approach 1:
The patent removes the active sulfur moiety from the silane coupling agent structure, extracting the harmful thermal degradation property while retaining the beneficial silica-polymer coupling function through alternative non-sulfur reactive groups
Solution Approach 2:
The invention changes the chemical composition parameter of the coupling agent by replacing sulfur-containing groups with non-sulfur alternatives, fundamentally altering the thermal stability characteristics while maintaining coupling functionality
2Strength
If sulfur-containing silane coupling agents are used, then rubber-to-filler bonds are formed, but large quantities are required increasing cost
Solution Approach 1:
The patent employs a coupling agent with extended functionality that provides durable rubber-to-filler bonding, replacing the need for large quantities of conventional agents with a smaller amount of higher-performance material
3Ease of manufacture
If conventional silanization is performed, then silica coupling is achieved, but temperature control is required to prevent degradation
Solution Approach 1:
The invention fundamentally changes the thermal stability parameter of the coupling agent by eliminating sulfur moieties, enabling the material to withstand higher processing temperatures without degradation, thus expanding the viable temperature window for silanization
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
This approach reduces the cost and thermal sensitivity of the silica dispersion process, enhancing the processability and performance of the rubber compounds by forming stable silica-silane-polymer bonds without the need for active sulfur, thereby improving the properties of the rubber compounds.
Implementation Method 1
a siloxyl condensation reaction between a silane functionalized diene elastomer and a non-sulfur containing silane coupling agent
Data Source
AI summary
A sulfur-vulcanizable rubber compound comprises a silane functionalized diene elastomer, a silane coupling agent, and a silica filler. The silane coupling agent excludes an active sulfur moiety. The rubber compound is a reaction product of a siloxyl condensation reaction between the silane functionalized diene elastomer and the non-sulfur containing silane coupling agent. The coupling agent comprises at least one end terminating group reactive with a hydroxyl group contained on the silica filler and a silane moiety contained on a diene-based elastomer.