Anti-Vibration Rubber Composition with High-Cis Isoprene and Silica
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Solution Overview
Problem
Conventional rubber compositions used in damping materials, such as those for vehicles, often have inferior dynamic magnification and fatigue properties, making it difficult to retain scorch resistance and work stability.
Innovation Solution
A rubber composition comprising natural rubber, high-cis isoprene rubber with a cis-1,4 bond content of 95% or more, carbon black with specific iodine and DBP adsorption numbers, silica with a nitrogen adsorption specific surface area, and a guanidine compound, along with a silane coupling agent, to achieve low dynamic magnification and improved fatigue properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional rubber compositions are used for damping materials, then manufacturing is simplified, but dynamic magnification and fatigue properties remain inferior
Solution Approach 1:
The patent modifies the conventional rubber composition parameters by specifying exact proportions: natural rubber (50-95 parts), high-cis isoprene rubber (5-50 parts), carbon black (5-50 parts), and silica (5-50 parts). These parameter changes maintain manufacturing simplicity through straightforward mixing while dramatically improving dynamic magnification and fatigue properties over conventional compositions.
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 exhibits excellent fatigue properties, low dynamic magnification, and enhanced scorch resistance, ensuring better work stability and performance in anti-vibration applications.
Implementation Method 1
a carbon black having an iodine adsorption number of 20 mg/g or less and a DBP adsorption number of 55 ml/100 g or less; a silica having a nitrogen adsorption specific surface area (the BET method) of 80 m 2 or more
Data Source
AI summary
The present invention provides a rubber composition and an anti-vibration rubber composition both comprising: a rubber component containing at least a natural rubber and a high-cis isoprene rubber having a content of cis-1,4 bond of 95% by mass or more; a carbon black having an iodine adsorption number of 35 mg/g or less and a DBP adsorption number of 75 ml/100 g or less; a silica having a nitrogen adsorption specific surface area (the BET method) of 80 m2/g or more and less than 240 m2/g; and a compound represented by the following general formula (1), (wherein m and n each independently represent an integer of 1 or more), and an anti-vibration rubber obtained by curing the rubber composition. The rubber composition and the anti-vibration rubber composition have a low dynamic magnification, are excellent in fatigue property and can retain scorch resistance (work stability).