Anti-Vibration Rubber Composition with Terminal Double Bond Antioxidant
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Solution Overview
Problem
Existing anti-vibration rubbers, particularly those using EPDM, fall short in durability and damping properties, and adding synthetic rubbers like SBR can compromise durability, while high reinforcing material content increases modulus of elasticity, making it unsuitable for applications requiring low elasticity.
Innovation Solution
A rubber composition combining natural rubber with a compound having a carbon-carbon double bond and an imidazole antioxidant, along with a diene-based synthetic rubber, to enhance both durability and damping properties, with specific antioxidant compounds and ratios optimizing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If EPDM is used as the rubber component to enhance heat resistance, then heat resistance is improved, but durability and damping properties deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the antioxidant by introducing a carbon-carbon double bond at the terminal position and a carbonyl group at the α-position. This structural modification enables the antioxidant to react with the rubber component and form a protective network, thereby improving durability while maintaining heat resistance.
Solution Approach 2:
The patent creates a composite antioxidant system by combining two specific antioxidants: one with a carbon-carbon double bond at terminal and carbonyl group at α-position (antioxidant A), and an imidazole antioxidant (antioxidant B). This composite approach produces synergistic effects that simultaneously achieve heat resistance, durability, and damping properties.
2Reliability
If synthetic rubber such as SBR is added to natural rubber to enhance damping properties, then damping properties are improved, but durability against large deformation and breaking strength deteriorate
Solution Approach 1:
The patent introduces a specific antioxidant compound as an intermediary that reacts with the rubber component to form a protective network. This intermediary substance enhances damping properties through its molecular structure while simultaneously protecting the rubber matrix, thereby maintaining breaking strength and durability against large deformation.
Solution Approach 2:
The patent modifies the antioxidant molecular parameters by specifying a carbon-carbon double bond at the terminal and a carbonyl group at the α-position. These parameter changes enable the antioxidant to form cross-links with the rubber, creating a network that improves damping without compromising strength.
3Reliability
If a large amount of reinforcing material such as carbon is added to enhance damping properties, then damping properties are improved, but modulus of elasticity increases making it difficult to apply where low elasticity is required
Solution Approach 1:
The patent replaces the mechanical reinforcement approach (adding large amounts of carbon black or other reinforcing materials) with a chemical approach using specifically designed antioxidants. The antioxidant molecules chemically interact with the rubber chains to provide damping through molecular-level mechanisms, avoiding the need for excessive reinforcing materials that would increase modulus of elasticity.
Solution Approach 2:
The patent changes the approach from macroscopic reinforcement (particle filling) to molecular-level modification by designing antioxidants with specific structural parameters (terminal carbon-carbon double bond and α-position carbonyl group). This parameter change enables effective damping without increasing modulus of elasticity.
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 composition achieves excellent durability and damping properties, effectively absorbing vibrations over extended periods in high-temperature environments, suitable for components like torsional dampers and engine mounts.
Implementation Method 1
it is presumably caused by the reaction of the carbon-carbon double bond in the antioxidant A with the rubber component
Implementation Method 2
when an imidazole antioxidant is additionally used in combination with the antioxidant A, damping properties can further be enhanced by the synergistic effects with the antioxidant A
Implementation Method 3
absorbs the vibration caused at the time of engine driving to suppress the intrusion of vibration and noise into a cabin and the noise diffusion to the surrounding environment
Data Source
AI summary
Provided is a rubber composition for producing an anti-vibration rubber which is good in both damping properties and durability. An anti-vibration rubber composition including: a rubber component including a natural rubber, and antioxidants, wherein the composition includes a compound having a carbon-carbon double bond at a terminal and a carbonyl group at an α position thereof and an imidazole antioxidant as the antioxidants.