Truck Tire Tread Rubber Composition for Wet Grip and Low Rolling Resistance
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Solution Overview
Problem
Existing truck tires face challenges in achieving a balance between low rolling resistance, good abrasion resistance, and wet grip properties, which are essential for environmental sustainability and safety.
Innovation Solution
A rubber composition for truck tires is developed, comprising 70 phr to 95 phr of polyisoprene, 5 phr to 30 phr of solution polymerized styrene butadiene rubber functionalized for silica coupling, and 40 phr to 80 phr of silica filler, which provides an advanced balance of wear, wet, and rolling resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional rubber compositions are used to reduce rolling resistance, then fuel efficiency improves, but wet grip and safety properties deteriorate
Solution Approach 1:
The patent employs a composite rubber composition combining polyisoprene (70-95 phr) with solution polymerized styrene butadiene rubber functionalized for silica coupling (5-30 phr), along with 40-80 phr silica filler. This composite material system achieves low rolling resistance while maintaining wet grip properties through the synergistic interaction of components, where the functionalized SBR acts as a bridge between the polyisoprene matrix and silica filler, enabling simultaneous optimization of both rolling resistance and wet grip performance
2Loss of energy
If silica content is increased to improve rolling resistance, then fuel efficiency improves, but tensile strength and elongation at break deteriorate
Solution Approach 1:
The patent optimizes the silica content parameter within a specific range (40-80 phr, preferably 45-75 phr) rather than maximizing it. This parameter optimization, combined with the functionalized SBR coupling agent, achieves the right balance between rolling resistance reduction and maintaining adequate tensile strength and elongation at break, avoiding the detrimental effects of excessive silica loading
3Reliability
If polyisoprene content is increased to improve wet grip, then safety improves, but rolling resistance increases
Solution Approach 1:
The patent creates local quality differentiation by assigning specific functions to different rubber components: polyisoprene (70-95 phr) provides wet grip and safety properties, while the functionalized solution polymerized styrene butadiene rubber (5-30 phr) with silica coupling groups provides low rolling resistance. This functional division allows each component to excel at its designated property without compromising the other
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 significantly reduces environmental impact and enhances safety by improving rolling resistance, abrasion resistance, and wet grip performance in truck tires.
Implementation Method 1
solution polymerized styrene butadiene rubber having a glass transition temperature of less than -40°C which is functionalized for the coupling to silica
Implementation Method 2
functionalized with one or more groups selected from i) at least one amino silane group, ii) at least one amino siloxane group, and iii) at least one amino silanol group
Implementation Method 3
40 phr to 80 phr of a filler comprising predominantly silica
Data Source
Figure 1
AI summary
A rubber composition for a truck tire (1) is disclosed. The rubber composition comprises 70 phr to 95 phr of polyisoprene; 5 phr to 30 phr of a solution polymerized styrene butadiene rubber having a glass transition temperature of less than -40°C which is functionalized for the coupling to silica; and 40 phr to 80 phr of a filler comprising predominantly silica. Also, a truck tire (1) is disclosed having a tread (10) and having said rubber composition in a radially outermost portion of its tread (10).