Air Spring Bellows Vulcanization With Reduced Zinc Oxide
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Solution Overview
Problem
Existing air spring bellows face challenges in achieving efficient vulcanization with reduced metal compound content without compromising cure rate and quality, particularly due to the reliance on zinc oxide as a primary activator.
Innovation Solution
Incorporating a eutectic composition into the vulcanizable rubber composition, which reduces the total loading of metal compounds like zinc oxide while maintaining cure quality and rate, by forming a eutectic solvent that aids in the vulcanization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc oxide is used as a primary activator in sulfur vulcanization, then cure rate and quality are maintained, but metal compound content increases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a eutectic mixture comprising a quaternary ammonium salt and a metal halide hydrate. This eutectic system modifies the vulcanization chemistry to achieve effective curing with reduced zinc oxide content, specifically reducing metal compound content while maintaining cure quality through alternative chemical pathways.
Solution Approach 2:
The patent employs a composite activator system combining quaternary ammonium salts with metal halide hydrates in eutectic proportions. This composite material approach creates a synergistic effect where the combination of components provides vulcanization activation capability with lower overall metal content compared to traditional zinc oxide-based systems.
2Object-affected harmful factors
If zinc oxide loading is reduced to lower metal content, then environmental and health concerns are addressed, but cure rate and quality may be compromised
Solution Approach 1:
The eutectic mixture acts as an intermediary system that facilitates vulcanization activation without requiring high levels of traditional metal activators. The quaternary ammonium salt and metal halide hydrate work together as mediator compounds to enable effective crosslinking at reduced metal concentrations, addressing harmful metal content while preserving cure quality.
Solution Approach 2:
The patent modifies the chemical parameters of the vulcanization system by replacing portions of zinc oxide with a eutectic mixture of quaternary ammonium salt and metal halide hydrate. This parameter change reduces the harmful metal content while maintaining the necessary activator function for high-quality curing through alternative chemical mechanisms.
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 a eutectic composition allows for the production of air spring bellows with lower metal content, ensuring effective vulcanization without adverse effects on cure rate or quality, resulting in technologically useful cured air spring bellows.
Implementation Method 1
heating the vulcanizable composition to thereby effect vulcanization
Implementation Method 2
zinc species and/or zinc oxide serve as an activator for the sulfur crosslinking
Implementation Method 3
a eutectic composition... which reduces the total loading of metal compounds like zinc oxide while maintaining cure quality and rate
Data Source
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AI summary
A method of preparing a cured air spring bellows includes preparing a vulcanizable composition including a eutectic composition by mixing a vulcanizable elastomer, a sulfur-based curative, zinc oxide, and a eutectic composition; preparing a green member using the vulcanizable composition; and curing the green member to form the air spring bellows.