Antidegradant Compounds for Oxidation-Resistant Vulcanized Rubber
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Solution Overview
Problem
Existing antidegradants for vulcanized rubber and other compositions face challenges in providing long-term efficacy against degradation from environmental factors like light, oxygen, ozone, and mechanical stress, while also maintaining compatibility with other additives and enhancing mechanical fatigue life.
Innovation Solution
The development of compounds represented by Formulae I-VI, which serve as antidegradants, antioxidants, or antiozonants, and are used in conjunction with elastomers, fillers, rubber chemicals, plasticizers, or other antidegradants to enhance the durability and service life of vulcanized elastomeric articles, lubricants, and fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antidegradants are used in vulcanized rubber articles, then some level of protection against oxidative degradation is provided, but the efficacy diminishes over prolonged periods particularly at exposed surfaces
Solution Approach 1:
The patent modifies the chemical structure of aromatic polyamine antidegradants by varying substituents at specific positions (R1-R11 groups) to enhance stability and efficacy. The structural parameters are changed to optimize resistance against degradation while maintaining protective function over prolonged periods
Solution Approach 2:
The patent combines multiple antidegradant compounds with elastomers and other additives to create composite compositions that provide synergistic protection. The composite system maintains efficacy at exposed surfaces while also protecting imbedded components from oxidative aging
2Object-affected harmful factors
If antidegradants are added to protect exposed surfaces, then surface degradation is reduced, but the effectiveness of other additives may be negatively impacted
Solution Approach 1:
The patent designs antidegradants with specific local chemical properties that allow them to preferentially locate and protect exposed surfaces where degradation occurs most, while maintaining compatibility with other additives in the bulk material through controlled molecular structure and functionality distribution
3Ease of manufacture
If general purpose elastomers like natural rubber are used in tire applications, then manufacturing and processing are simplified, but the articles are especially prone to degradation from oxygen and ozone
Solution Approach 1:
The patent incorporates antidegradant compounds into the elastomer composition before vulcanization to pre-establish protective mechanisms against oxygen and ozone degradation. This preliminary protection is built into the material structure during manufacturing, allowing general purpose elastomers to be used while preventing subsequent environmental degradation
4Duration of action of stationary object
If antidegradants provide protection against oxidative aging, then material service life is extended, but the mechanical fatigue life after service may still be compromised
Solution Approach 1:
The patent employs antidegradant compounds that preemptively protect the elastomer matrix from oxidative damage during service, cushioning against the accumulation of degradation products that would otherwise accelerate fatigue and crack propagation. This beforehand protection preserves mechanical integrity for extended periods
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
These compounds effectively inhibit oxidative degradation and improve the mechanical fatigue life of vulcanized rubber articles, while maintaining compatibility with other additives, thus extending the useful service life of the materials.
Implementation Method 1
compounds with antidegradant, e.g., antiozonant, antioxidant and/or antifatigue, properties that are useful additives for vulcanized rubber articles
Implementation Method 2
Articles formed from general purpose elastomers such as natural rubber, in particular tires, are especially prone to degradation from both oxygen and ozone
Implementation Method 3
Fatigue and crack propagation are also issues of specific concern, in particular for steel belt edge areas and tire sidewalls which are subject to significant stresses and stretching forces while flexed
Data Source
AI summary
The present disclosure provides compounds represented by Formula (I):or salts or solvates thereof, wherein R1, R2, R4, R5, R6, R7, R8, R9, R10, R11, and X are as defined in the specification. The present disclosure also provides compositions, vulcanized elastomeric articles, lubricant compositions, combustible fuel compositions, and fuel additive compositions comprising a compound disclosed herein. The present disclosure also provides processes for preparing the compositions and vulcanized elastomeric articles described herein. The present disclosure also provides a process for retreading tires using a composition described herein. The present disclosure also provides kits comprising a composition described herein.