Rubber Composition Heat Aging Resistance via Phenolic Compound
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rubber compositions used in pneumatic tires and other rubber products face durability issues due to cracking caused by oxygen and ozone deterioration, and they lack effective heat aging resistance.
Innovation Solution
A rubber composition containing 0.1 to 10 parts by mass of a compound represented by the general formula (1), where at least one of R1 to R5 is an —OH group or —OCH3 group, and A is an unsaturated bond or alkylene group, with B being a —COOH, —OH, or ═O group, optionally forming a ring structure, is used. Naturally occurring compounds like 3,4-dihydroxycinnamic acid or 3,4-dimethoxycinnamic acid are preferred for enhanced heat aging resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If 0.5 parts by weight of amine-based antiaging agent and 0.5 to 8 parts by weight of polyphenol-based compound are blended with 100 parts by weight of rubber component, then oxidation and ozone deterioration are reduced, but heat aging resistance remains insufficient
Solution Approach 1:
The patent optimizes the compositional parameters by specifying a precise content range of 0.1 to 10 parts by mass of the novel compound per 100 parts by mass of rubber component. This parameter optimization ensures sufficient heat aging resistance while maintaining effective oxidation and ozone protection through the synergistic action of all antiaging agents in the composition.
Solution Approach 2:
The novel compound of formula (1) acts as an intermediary substance that bridges the gap between conventional antiaging agents and heat aging resistance requirements. Its specific molecular structure with phenolic hydroxyl and carbonyl groups allows it to mediate between the protective functions of conventional agents and the thermal stability requirements, achieving comprehensive protection.
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, with naturally occurring compounds like 3,4-dihydroxycinnamic acid or 3,4-dimethoxycinnamic acid effectively preventing blooming and enhancing antioxidative effects, resulting in superior durability of vulcanized rubber.
Implementation Method 1
various antiaging agents are added to a rubber composition used as a raw material to prevent oxidation deterioration or ozone deterioration of the rubber part
Implementation Method 2
a rubber product including a rubber part, such as a pneumatic tire or a rubber vibration insulator, may generally deteriorate in durability during long-term use as a result of the occurrence of cracking caused by deterioration by oxygen or ozone in the air
Data Source
AI summary
A rubber composition comprising, per 100 parts by mass of a total amount of a rubber component, 0.1 to 10 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, A is an unsaturated bond or an alkylene group having 1 to 20 carbon atoms and optionally having an —H group, a —CH3 group, an —NH2 group, an —O— group, or an —OH group, n is an integer of 0 to 10, and B is a —COOH group, an —OH group, or an ═O group and optionally forms a ring structure with adjacent R1 or R5.