High-Grip Tire Rubber Composition for Steering Stability
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Solution Overview
Problem
Tires with existing rubber compositions exhibit improved steering stability but still require enhancements in rolling resistance performance and abrasion resistance.
Innovation Solution
A high-grip tire rubber composition comprising 100 parts of styrene butadiene rubber with 20% or more styrene content, 0.1 to 90 parts of a modified liquid diene rubber with specific molecular weight and vinyl content, and 20 to 150 parts of filler, such as carbon black or silica, which is either used as is or crosslinked to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional processability improvers (process oils and liquid polymers) are used to improve processability, then processability is improved, but steering stability, rolling resistance performance and abrasion resistance are deteriorated
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid polymer by specifying a hydrogenation ratio of 40-60% and vinyl content of 30-70 mol%, which fundamentally alters the molecular structure to achieve both processability and performance
Solution Approach 2:
The patent creates a composite rubber composition by combining SBR (60-100 parts), hydrogenated liquid polybutadiene (40-150 parts), and silica (20-150 parts) in specific proportions, where the components work synergistically to resolve the contradiction between processability and performance
2Strength
If rubber reinforcing agents (carbon blacks and silicas) are used to enhance abrasion resistance, then abrasion resistance is improved, but viscosity increases and processability deteriorates
Solution Approach 1:
The patent changes the particle size parameter of silica to 5-50 nm (ultrafine range) and controls the hydroxyl group content at 1-5 mmol/g, which optimizes the balance between reinforcement effectiveness and processability by reducing agglomeration while maintaining strength
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 tire rubber composition achieves superior steering stability, rolling resistance performance, and abrasion resistance, making it suitable for tire treads, bead fillers, and tire belts.
Implementation Method 1
a crosslinked product of the composition
Data Source
AI summary
The invention provides a high-grip tire rubber composition excellent in steering stability, rolling resistance performance and abrasion resistance, and a tire tread, a bead filler, a tire belt and a pneumatic tire which each partially include the composition. The high-grip tire rubber composition includes 100 parts by mass of a solid rubber (A), the solid rubber (A) including not less than 60 mass% of a styrene butadiene rubber with 20 mass% or more styrene content, 0.1 to 90 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound represented by the formula (1), and 20 to 150 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is 15,000 to 120,000, and (ii) the vinyl content is not more than 70 mol%.