Tire Rubber Composition with Modified Liquid Diene Rubber
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Solution Overview
Problem
Tire rubber compositions face a tradeoff between mechanical strength, abrasion resistance, and rolling resistance performance, with existing formulations struggling to achieve a well-balanced improvement in all these aspects, and there is a need for enhanced steering stability and fuel efficiency.
Innovation Solution
A tire rubber composition comprising 100 parts of solid rubber with a specific glass transition temperature, 0.1 to 50 parts of modified liquid diene rubber with a silane-derived functional group, and 20 to 200 parts of filler, where the modified liquid diene rubber has a weight average molecular weight of 15,000 to 120,000, a vinyl content of not more than 70 mol%, and a glass transition temperature of not more than 0°C, is used to create crosslinked products with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fillers with small average particle diameter (5 to 100 nm) are used to enhance mechanical strength and abrasion resistance, then mechanical strength and abrasion resistance are improved, but rolling resistance performance deteriorates due to poor dispersibility and easy heat generation
Solution Approach 1:
The invention changes the particle size parameter of the filler from conventional small sizes (5-100 nm) to a specific range (1 µm to 500 µm), which fundamentally alters the dispersibility and heat generation characteristics while maintaining reinforcing effects. This parameter change resolves the contradiction by finding an optimal size that balances mechanical strength enhancement with reduced rolling resistance.
Solution Approach 2:
The invention uses a composite filler system comprising both inorganic filler (silica or carbon black) and organic filler (rubber particles or polymer particles). This composite approach allows the inorganic filler to provide mechanical strength while the organic filler improves dispersibility and reduces heat generation, thereby resolving the contradiction between strength enhancement and rolling resistance.
2Loss of energy
If fillers with large particle diameter (100 to 200 nm) are used to improve dispersibility and reduce heat generation, then rolling resistance performance is improved, but mechanical strength and abrasion resistance are insufficient
Solution Approach 1:
The invention employs a composite filler system where inorganic filler particles (providing mechanical strength) are combined with organic filler particles (providing good dispersibility). The specific particle size range (1 µm to 500 µm) ensures both components work synergistically to achieve adequate mechanical strength while maintaining low rolling resistance.
Solution Approach 2:
The invention applies different filler types to different functional requirements: inorganic filler (silica or carbon black) for mechanical strength and abrasion resistance, and organic filler (rubber or polymer particles) for dispersibility and heat management. This local quality differentiation resolves the contradiction by assigning specific functions to specific filler components.
3Strength
If high amounts of filler are added to enhance mechanical strength and hardness, then abrasion resistance and steering stability are improved, but productivity decreases due to prolonged kneading time
Solution Approach 1:
The composite filler system with particles in the 1 µm to 500 µm range provides excellent dispersibility, allowing high filler loads to be achieved without excessive kneading time. The organic filler component acts as a dispersing agent that facilitates uniform distribution of inorganic filler particles, thereby maintaining productivity while achieving high abrasion resistance.
4Stability of the object's composition
If high filler loading is used to achieve enhanced mechanical strength, then steering stability is improved, but the rubber composition becomes difficult to process and heat up easily
Solution Approach 1:
The invention changes the filler particle size to a specific range (1 µm to 500 µm) that optimizes both processing characteristics and final product performance. This parameter change ensures that high filler loading can be achieved with good processability and without excessive heat generation during processing, while still achieving enhanced steering stability.
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 achieves enhanced rolling resistance performance, abrasion resistance, and steering stability, leading to improved fuel efficiency and mechanical strength, while maintaining flexibility at low temperatures.
Implementation Method 1
a tire rubber composition comprising 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound, and 20 to 200 parts by mass of a filler (C)... capable of giving crosslinked products having excellent properties including mechanical strength such as abrasion resistance
Implementation Method 2
The fillers are known to exhibit their reinforcing effects by physically or chemically adsorbing the rubber components to the surface of the filler particles
Implementation Method 3
the present invention pertains to a tire rubber composition... capable of giving crosslinked products having excellent properties
Data Source
AI summary
The invention provides a tire rubber composition capable of giving crosslinked products having excellent properties including mechanical strength such as abrasion resistance, a crosslinked product of the composition, and a tire tread, a bead filler, a tire belt and a pneumatic tire which each partially include the composition or the crosslinked product and which each exhibit enhanced rolling resistance performance (low fuel consumption performance) and can attain enhanced steering stability. The tire rubber composition includes 100 parts by mass of a solid rubber (A) having a glass transition temperature (Tg) of not more than -10°C, 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) to (iv) : (i) the weight average molecular weight (Mw) is 15,000 to 120, 000, (ii) the vinyl content is not more than 70 mol%, (iii) the average number of the functional groups per molecule of the modified liquid diene rubber (B) is 1 to 30, and (iv) the glass transition temperature (Tg) is not more than 0°C.