Tire Rubber Composition with Microfibrillated Plant Fibers
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Solution Overview
Problem
Microfibrillated plant fibers have poor compatibility with rubber components, leading to reduced elongation at break and fuel economy in tires, making them unsuitable for long-term use under harsh conditions, and existing methods to enhance compatibility are complex and resource-intensive.
Innovation Solution
Incorporating partially decomposed industrial lignin into microfibrillated plant fibers to improve their compatibility with rubber components, reducing energy loss and enhancing tensile properties and fuel economy through a simple method that minimizes petroleum resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If microfibrillated plant fibers are compounded into rubber composition, then reinforcement and tensile properties are improved, but elongation at break is reduced and fuel economy deteriorates due to poor compatibility with rubber component
Solution Approach 1:
The patent uses silane coupling agent as an intermediary substance that chemically bonds to both the microfibrillated plant fibers and the rubber component. The silane coupling agent contains hydrolyzable groups that react with hydroxyl groups on fiber surfaces and organofunctional groups that bond with rubber, creating a bridge that improves compatibility and reduces interfacial energy loss, thereby maintaining elongation at break while preserving tensile reinforcement.
Solution Approach 2:
The patent modifies the surface parameters of microfibrillated plant fibers by treating them with silane coupling agents, changing the chemical composition and surface properties of the fibers. This parameter change enhances the chemical affinity between fibers and rubber, reducing interfacial slippage and energy dissipation, which improves both elongation at break and fuel economy while maintaining tensile strength.
2Strength
If microfibrillated plant fibers are compounded into rubber composition, then reinforcement is improved, but fuel economy is reduced due to energy loss in the interface between fibers and rubber component
Solution Approach 1:
The silane coupling agent acts as a mediator that reduces interfacial energy loss between microfibrillated plant fibers and rubber. By forming strong chemical bonds at the interface, it prevents slippage and micro-detachment during deformation, reducing hysteresis loss and heat generation, thereby improving fuel economy while maintaining the reinforcement effect of the fibers.
3Reliability
If chemical treatment is applied to enhance compatibility of plant fibers with rubber component, then compatibility is improved, but manufacturing complexity increases due to additional chemical reaction processes
Solution Approach 1:
The patent employs silane coupling agents that can be applied as simple liquid coatings or masterbatches during standard rubber compounding. These agents provide effective surface modification without requiring complex chemical treatment equipment or multi-step processes, reducing manufacturing complexity while achieving good compatibility. The treatment can be integrated into existing mixing processes.
4Reliability
If conventional chemical treatment methods are used to enhance fiber compatibility, then compatibility is improved, but resource consumption increases due to use of specialized chemical reagents
Solution Approach 1:
The silane coupling agents used in the patent can be applied in small quantities during standard rubber compounding operations. The agents self-react with the fiber surfaces and rubber matrix through hydrolysis and condensation reactions, providing effective compatibility enhancement without requiring large amounts of additional chemicals or specialized treatment resources, thus reducing overall resource consumption.
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 achieves balanced improvements in tensile properties, handling stability, and fuel economy while reducing petroleum resource consumption, with enhanced adhesion and reinforcement of microfibrillated plant fibers and industrial lignin.
Implementation Method 1
by using a lignin substance (industrial lignin) that is a by-product in a pulp manufacturing process... it is possible to surface-treat microfibrillated plant fibers by a simple method... so that the compatibility of microfibrillated plant fibers with the rubber component is enhanced
Data Source
AI summary
Provided are a rubber composition for a tire, in which while the use of petroleum resources is reduced as much as possible, the compatibility of microfibrillated plant fibers with the rubber component is enhanced by a simple method, which can lead to a balanced improvement in tensile properties, handling stability, and fuel economy; a method of preparing the rubber composition; and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a tire, containing a rubber component, microfibrillated plant fibers, and an industrial lignin. It is preferable that the rubber component should contain at least one selected from the group consisting of natural rubber, modified natural rubber, synthetic rubber, and modified synthetic rubber, and it is preferable that the microfibrillated plant fibers should be cellulose microfibrils.