Lignin-Based Tire Rubber Composition for Long-Lasting Oxidation Resistance
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Solution Overview
Problem
Existing rubber compositions for tires rely heavily on petroleum-based compounds, leading to high carbon emissions, volatile organic substance release, and high production costs, with petroleum-based antioxidants posing additional challenges due to their high cost and short oxidation preventive effect.
Innovation Solution
A rubber composition incorporating 100 parts by weight of raw material rubber, 1 to 20 parts by weight of a lignin-based antioxidant, and 0.1 to 3 parts by weight of a crosslinking agent, where the lignin-based antioxidant is an aminated lignin with an amine group at the ortho- and/or meta-position to a hydroxy group, providing an oxidation inhibiting effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-based antioxidants are used, then oxidation preventive effect is achieved, but production cost increases and the effect duration is short
Solution Approach 1:
The patent changes the chemical structure parameters of the antioxidant by introducing aromatic rings and specific functional groups (amino, hydroxyl, carboxyl) into the lignin molecule. This structural modification enables the antioxidant to maintain stable performance over extended periods, resolving the short effect duration issue while keeping production costs low through use of renewable lignin feedstock
Solution Approach 2:
The patent creates a composite antioxidant system by combining lignin backbone with multiple functional groups (amino, hydroxyl, carboxyl) and potentially multiple lignin molecules working synergistically. This composite structure provides both immediate oxidation prevention and long-lasting protective effect, overcoming the limitation of short effect duration of conventional antioxidants
2Reliability
If petroleum-based compounds are used in rubber compositions, then desired performance is achieved, but carbon emissions increase
Solution Approach 1:
The patent extracts and utilizes lignin, a natural polymer already present in renewable resources, to replace petroleum-based antioxidants and compounding agents. By taking out the harmful petroleum-based components and substituting them with bio-based lignin derivatives, the invention maintains rubber composition performance while eliminating the associated carbon emissions and environmental harm
Solution Approach 2:
The patent changes the source parameter of the rubber composition components from petroleum-based to bio-based lignin. This fundamental parameter change transforms the environmental profile of the product, reducing carbon emissions and harmful factors while maintaining or improving performance through the inherent properties of lignin and its functional group modifications
3Object-generated harmful factors
If small amounts of lignin (1-2 wt%) are used as additives, then carbon neutral benefits are achieved, but the components undergo thermal decomposition at high temperatures
Solution Approach 1:
The patent changes the molecular weight parameter and chemical structure parameters of lignin by introducing functional groups and creating crosslinked structures. These parameter changes significantly improve thermal stability, allowing lignin-based antioxidants to withstand high processing temperatures without decomposition, thereby resolving the reliability issue while maintaining carbon neutral benefits
Solution Approach 2:
The patent creates a composite structure where lignin molecules are crosslinked and integrated into the rubber matrix through chemical bonding. This composite approach enhances thermal stability by creating a robust network structure that resists thermal decomposition, enabling the use of lignin at effective concentrations without sacrificing thermal reliability
4Reliability
If aminated lignin with specific structure is used, then oxidation inhibition is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary chemical modification of lignin to introduce amino, hydroxyl, and carboxyl groups at specific positions before incorporating it into the rubber composition. This preliminary action creates a pre-functionalized lignin product that delivers superior oxidation inhibition, while the modification process can be integrated into existing lignin processing workflows, managing manufacturing complexity
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 composition effectively inhibits oxidation, reduces carbon dioxide emissions, prevents volatile organic substance release, and lowers production costs by using a naturally occurring lignin-based antioxidant, offering improved fatigue resistance and prolonged product life.
Implementation Method 1
the lignin-based antioxidant is an aminated lignin having an amine group at the ortho- and/or meta-position with respect to a hydroxy group of lignin... which has an excellent oxidation inhibiting effect
Data Source
AI summary
The present invention relates to a rubber composition for a tire, which includes 100 parts by weight of raw material rubber, 1 to 20 parts by weight of a lignin-based antioxidant, and 0.1 to 3 parts by weight of a crosslinking agent.