Base Tread Rubber Composition Balancing Stability and Heat Build-Up
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Solution Overview
Problem
Conventional rubber compositions for base treads face challenges in balancing steering stability and low heat generation properties while maintaining durability, as increasing filler content improves hardness but deteriorates low heat generation properties, and decreasing filler content compromises steering stability.
Innovation Solution
A rubber composition for base treads comprising a rubber component with 70% natural rubber, a first filler of carbon black with a nitrogen adsorption specific surface area less than 60 m²/g and a second filler of carbon black or silica with a surface area of 60 m²/g or more, along with a sulfenamide-based vulcanization accelerator, in specific proportions, to enhance steering stability and low heat generation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the amount of filler is increased to improve hardness and steering stability, then steering stability is improved, but low heat generation properties deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the nitrogen adsorption specific surface area of carbon black to be less than 60 m²/g, and adjusting the filler content within specific ranges (carbon black: 20-40 parts by mass, silica: 0-20 parts by mass per 100 parts by mass of rubber component). This optimization of physical parameters enables the rubber composition to achieve both improved steering stability and maintained low heat generation properties by finding the optimal balance point in the parameter space.
Solution Approach 2:
The patent uses composite materials by combining carbon black with specific nitrogen adsorption surface area characteristics and silica in controlled proportions within the rubber composition. This composite approach allows the synergistic interaction between different fillers to achieve both steering stability (through carbon black's reinforcing effect) and low heat generation properties (through silica's contribution to reduced hysteresis loss), resolving the contradiction between these two performance requirements.
2Loss of energy
If the amount of filler is decreased to improve low heat generation properties, then low heat generation properties are improved, but steering stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the nitrogen adsorption specific surface area of carbon black to be less than 60 m²/g and optimizing the filler content within specific ranges. This parameter optimization enables the rubber composition to achieve both improved low heat generation properties and maintained steering stability by finding the optimal balance point in the parameter space.
Solution Approach 2:
The patent uses composite materials by combining carbon black with specific nitrogen adsorption surface area characteristics and silica in controlled proportions. This composite approach allows the synergistic interaction between different fillers to achieve both low heat generation properties (through silica's contribution to reduced hysteresis loss) and steering stability (through carbon black's reinforcing effect), resolving the contradiction between these two performance requirements.
3Stability of the object's composition
If conventional rubber compositions are used to improve steering stability, then steering stability is improved, but durability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the nitrogen adsorption specific surface area of carbon black to be less than 60 m²/g and adjusting the filler content within specific ranges. This optimization of physical parameters enables the rubber composition to achieve both improved steering stability and suppressed deterioration of durability by finding the optimal balance point in the parameter space.
Solution Approach 2:
The patent uses composite materials by combining carbon black with specific nitrogen adsorption surface area characteristics and silica in controlled proportions. This composite approach allows the synergistic interaction between different fillers to achieve both steering stability (through carbon black's reinforcing effect) and durability (through the composite structure's enhanced resistance to degradation), resolving the contradiction between these two performance requirements.
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 improved steering stability and low heat generation properties while suppressing deterioration of durability, with enhanced crosslinking density and tear strength.
Implementation Method 1
carbon black having a nitrogen adsorption specific surface area of less than 60 m 2/g
Implementation Method 2
sulfur, and a sulfenamide-based vulcanization accelerator
Data Source
AI summary
A rubber composition for a base tread according to an embodiment includes a rubber component containing 70 mass% or more of natural rubber, a first filler that is carbon black having an N2SA of less than 60 m2/g, a second filler that is carbon black having an N2SA of 60 m2/g or more and/or silica, sulfur, and a sulfenamide-based vulcanization accelerator. Per 100 parts by mass of the rubber component, the amount of the first filler is 10 to 45 parts by mass, the amount of the second filler is 15 to 30 parts by mass, the total amount of the first filler and the second filler is 35 to 60 parts by mass, the amount of the sulfur is 1.6 to 3.0 parts by mass, and the amount of the sulfenamide-based vulcanization accelerator is 1.6 to 3.0 parts by mass.