Tyre Elastomeric Compound with Oxidised Carbon Black Catalysis
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Solution Overview
Problem
Existing elastomeric compounds for tyres face challenges in achieving stable mechanical properties due to the slower kinetics of phenolic resin cross-linking reactions, which are not compatible with conventional sulphur vulcanisation, leading to inconsistent mechanical properties during tyre production.
Innovation Solution
Incorporating oxidised carbon allotropes, particularly oxidised carbon black with a large surface area, into the elastomeric composition to accelerate phenolic resin cross-linking reactions, ensuring stable mechanical properties without depressing sulphur vulcanisation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If phenolic resins are used as secondary cross-linking systems in elastomeric compounds, then the elastic modulus is improved, but the mechanical properties become unstable due to slower cross-linking kinetics compared to sulphur vulcanisation
Solution Approach 1:
Oxidised carbon black acts as a catalyst intermediary that accelerates the secondary cross-linking reactions of phenolic resins. The oxidised surface groups on carbon black particles provide catalytic sites that promote phenolic cross-linking kinetics, enabling these slower reactions to proceed at rates compatible with conventional sulphur vulcanisation processes, thus stabilizing mechanical properties during tyre operation.
2Speed
If oxidised carbon black is incorporated to accelerate phenolic resin cross-linking, then the cross-linking speed is improved, but the sulphur vulcanisation reaction is depressed
Solution Approach 1:
The oxidised carbon black exerts its catalytic effect locally at the sites of phenolic resin cross-linking without significantly interfering with the sulphur vulcanisation system. The localized catalysis occurs at the carbon black-phenolic resin interface, allowing selective acceleration of phenolic cross-linking while maintaining overall sulphur vulcanisation productivity.
Solution Approach 2:
The patent uses oxidised carbon black in controlled amounts (0.1-10 parts by weight per 100 parts of elastomeric polymer) to achieve partial catalysis of phenolic cross-linking. This partial action is sufficient to accelerate phenolic reactions to match sulphur vulcanisation rates without excessive catalysis that would depress sulphur curing efficiency.
3Loss of time
If conventional vulcanisation is used, then the production time is reduced, but the phenolic resin cross-linking is incomplete leading to marching modulus
Solution Approach 1:
The oxidised carbon black is pre-incorporated into the elastomeric compound formulation before vulcanisation. This preliminary inclusion ensures that catalytic sites are already distributed throughout the compound, ready to immediately accelerate phenolic cross-linking reactions as soon as vulcanisation begins, ensuring complete cross-linking within conventional production times.
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 use of oxidised carbon allotropes like oxidised carbon black enhances the cross-linking process, resulting in elastomeric compounds with stable mechanical properties in conventional vulcanisation times, improving tyre production consistency.
Implementation Method 1
oxidised carbon black, and especially oxidised carbon black with a large surface area, are able to complete the cross-linking reactions of phenolic resins in of elastomeric compounds for tyres, in conventional times and conditions of vulcanisation
Implementation Method 2
it was known that carbon black slowed the kinetics of sulphur vulcanisation of rubber due to the presence of oxidised surface species originated by the action of oxygen on the carbon
Data Source
AI summary
The present invention relates to elastomeric compositions for tyres and relative compounds, components and tyres comprising them, said compositions comprising an elastomeric polymer, a phenolic product, optionally already partially cross-linked, optionally an aldehyde and/or at least a methylene donor product and an oxidised carbon allotrope as a cross-linking catalyst. Advantageously, this catalyst is able to complete the cross-linking reactions of the phenolic resins in the conventional times and conditions of vulcanisation, or even more rapidly, providing mechanically stable compounds.