Rubber Composition Balancing Aged Tackiness and Crack Resistance
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Solution Overview
Problem
Existing rubber compositions face issues with deteriorated tackiness after aging, particularly when using cobalt acetylacetonate, which affects the adhesion and crack resistance of rubber articles.
Innovation Solution
A rubber composition comprising an elastomer matrix with polyisoprene, a reinforcing filler, cobalt acetylacetonate, and a fatty acid with over 10% unsaturated fatty acid, in specific proportions, enhances tackiness and crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cobalt acetylacetonate is used in rubber composition, then breaking properties are improved, but tackiness after aging deteriorates
Solution Approach 1:
A fatty acid is introduced as an intermediary substance between cobalt acetylacetonate and the elastomer matrix. The fatty acid content is controlled at 0.1-2.0 phr to mediate the interaction, preventing cobalt acetylacetonate from deteriorating tackiness after aging while preserving its breaking property enhancement
Solution Approach 2:
The composition parameters are precisely controlled: cobalt acetylacetonate at 0.1-2.0 phr, fatty acid at 0.1-2.0 phr with more than 10% unsaturated fatty acid content, and polyisoprene at more than 50 phr. These parameter optimizations resolve the contradiction by finding the balanced range where both breaking properties and aged tackiness are improved
2Strength
If cobalt acetylacetonate is used to enhance breaking properties, then initial tackiness may be maintained, but adhesion and crack resistance are affected
Solution Approach 1:
The fatty acid acts as a protective intermediary that shields the elastomer matrix from the harmful effects of cobalt acetylacetonate on crack resistance. By controlling the fatty acid content at 0.1-2.0 phr, the composition maintains crack resistance while still benefiting from improved breaking properties
Solution Approach 2:
The potentially harmful effect of cobalt acetylacetonate on crack resistance is converted into a benefit through the addition of fatty acid. The fatty acid transforms the negative interaction into a positive outcome where both breaking properties and crack resistance are improved simultaneously
Data Source
AI summary
A rubber composition is based on an elastomer matrix, a reinforcing filler, a cobalt acetylacetonate and a fatty acid based on more than 10% by weight an unsaturated fatty acid per 100% by weight of the fatty acid.