Rubber Composition with Polysulfide Crosslinked Fine Particles
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Solution Overview
Problem
Conventional rubber compositions for tires face challenges in balancing breaking properties, rolling resistance performance, and wet grip performance, with existing solutions either compromising on breaking properties or failing to achieve an optimal balance.
Innovation Solution
A rubber composition comprising 100 parts of diene rubber and 1 to 100 parts of fine particles with a glass transition point of −70° C. to 0° C., crosslinked by a polyfunctional monomer with a polysulfide bond, enhancing the polysulfide bond's crosslinked structure for improved binding with the rubber, thereby improving breaking properties and balancing rolling resistance and wet grip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fine particles having no reactive silyl group are added to enhance wet grip performance, then wet grip performance is improved, but breaking properties deteriorate
Solution Approach 1:
The patent introduces fine particles with reactive silyl groups as an intermediary between the rubber component and the filler particles. These silyl-containing fine particles act as a bridge that chemically bonds to both the rubber matrix and the filler, thereby improving breaking properties while maintaining the wet grip performance enhancement provided by the fine particles.
Solution Approach 2:
The patent creates a composite material system combining rubber component, fine particles with reactive silyl groups, and filler particles. This composite structure allows the fine particles to serve dual functions: enhancing wet grip performance through their physical presence and improving breaking properties through their chemical reactivity with the rubber matrix.
2Object-generated harmful factors
If fine particles are added to improve wet grip performance, then wet grip performance is enhanced, but rolling resistance performance may deteriorate
Solution Approach 1:
The patent optimizes the particle size parameter of the fine particles, specifying an average particle size of 0.5 µm or less (with preferred ranges of 0.1-0.5 µm). This parameter change allows the fine particles to effectively enhance wet grip performance while minimizing their negative impact on rolling resistance performance by reducing unnecessary energy dissipation.
3Object-generated harmful factors
If polymer particles are added to enhance wet grip performance, then wet grip performance is improved, but interaction with rubber component is insufficient leading to suboptimal breaking properties
Solution Approach 1:
The patent imparts local quality to the fine particles by equipping them with reactive silyl groups at their surfaces. This localized chemical reactivity at the particle surfaces enables strong chemical bonding with the rubber component in the surrounding matrix, thereby significantly improving breaking properties while the particles themselves continue to provide wet grip performance enhancement.
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 an excellent balance of breaking properties, rolling resistance performance, and wet grip performance, as demonstrated by enhanced tensile strength, elongation at break, and reduced rolling resistance, leading to improved fuel efficiency.
Implementation Method 1
fine particles (A) having a crosslinked structure crosslinked by at least one polyfunctional monomer having a polysulfide bond
Implementation Method 2
crosslinked by at least one polyfunctional monomer having a polysulfide bond in which at least two successive sulfur atoms are bonded together
Data Source
AI summary
There is provided a rubber composition which can provide a tire having an excellent balance of the breaking properties, the rolling resistance performance (low fuel consumption) and the wet grip performance. The rubber composition includes 100 parts by mass of a diene rubber, and 1 to 100 parts by mass of fine particles (A) having a glass transition point of −70° C. to 0° C. and composed of a polymer comprising constituent units of at least one monofunctional monomer. The fine particles (A) have a crosslinked structure crosslinked by at least one polyfunctional monomer having a polysulfide bond in which at least two successive sulfur atoms are bonded together.