Pneumatic Tire Rubber Composition for Heat Aging Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rubber compositions, such as those disclosed in Patent Document 1, lack sufficient heat aging resistance, and lignin derivatives in Patent Document 2 do not address this issue effectively.
Innovation Solution
A rubber composition containing a compound represented by general formula (1) and a lignin-based antiaging agent, with specific compounds like 3,4-dihydroxycinnamic acid or 3,4-dimethoxycinnamic acid, is used to enhance heat aging resistance, leveraging their interaction to stabilize rubber molecules and prevent radical generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic antiaging agents are used to improve durability, then protection against deterioration is enhanced, but environmental impact increases
Solution Approach 1:
The patent replaces complex synthetic antiaging agents with a combination of naturally derived phenolic compounds (Formula 1) and lignin-based agents. These natural compounds provide effective antiaging protection while being more environmentally benign, aligning with the principle of using simpler, naturally occurring substances instead of complex synthetic ones to reduce environmental impact while maintaining protective function.
Solution Approach 2:
The patent modifies the chemical structure parameters of conventional phenolic antiaging agents by introducing specific hydroxyl and alkoxy substitution patterns on the benzene ring (Formula 1), creating compounds with optimized balance between effectiveness and environmental compatibility. This structural parameter optimization maintains protective performance while reducing environmental harm compared to traditional synthetic alternatives.
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 rubber composition exhibits improved heat aging resistance and reduced environmental impact, with enhanced molecular stability and radical prevention through the combined use of the compound and lignin-based antiaging agent.
Implementation Method 1
the function of stabilizing a rubber molecule due to the addition of an H radical to the rubber molecule by an —OH group
Implementation Method 2
an —OH group in the carboxylic acid (—COOH group) adds a hydrogen radical to a radical generated in a rubber molecule to stabilize the rubber molecule
Implementation Method 3
an —OH group in the lignin-based antiaging agent supplies a hydrogen radical to the —COO radical of the compound represented by general formula (1) so that the carboxylic acid (—COOH group) as the compound represented by general formula (1) is regenerated
Implementation Method 4
coexistence of the compound represented by general formula (1) and the lignin-based antiaging agent prevents radical generation in rubber molecules so that the heat aging resistance of a resultant vulcanized rubber can significantly be improved
Data Source
AI summary
A rubber composition containing, when a total amount of a rubber component is taken as 100 parts by mass, 0.5 to 6 parts by mass of a compound represented by the following general formula (1):wherein at least one of R1 to R5 is an —OH group or an —OCH3 group and others are each an —H group or a hydrocarbon group having 1 to 20 carbon atoms) and 0.5 to 6 parts by mass of a lignin-based antiaging agent.