Oil-Absorbent Polymer Particles for Studless Tire Ice Traction
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Solution Overview
Problem
Studless tires face challenges in improving both on-ice performance and rolling resistance performance simultaneously, with existing technologies not effectively addressing these requirements.
Innovation Solution
A rubber composition for studless tires is developed, comprising natural rubber, polybutadiene rubber, and oil-absorbent polymer particles with specific properties, including a glass transition temperature of −70 to −20° C. and oil absorption of 100 to 1,500 ml/100 g, blended with oil, to enhance traction and reduce rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional oil absorbents are used to retain process oil, then rolling resistance performance is improved, but on-ice performance is not improved
Solution Approach 1:
The patent changes the parameters of the oil absorbent by specifying a glass transition temperature range of -70 to -20°C and oil absorption capacity of 100 to 1,500 ml/100g. These parameter changes enable the oil absorbent to provide both low-temperature flexibility for on-ice performance and oil retention for rolling resistance performance.
Solution Approach 2:
The patent uses a composite material system combining natural rubber, polybutadiene rubber, and specifically designed oil-absorbent polymer particles. This composite structure allows the different components to work synergistically, with the oil-absorbent particles providing both the needed flexibility and oil retention properties.
2Quantity of substance
If polymer with high oil affinity is used as oil absorbent, then oil retention is improved, but on-ice performance and rolling resistance performance are not improved
Solution Approach 1:
The patent specifies precise parameter ranges for the oil-absorbent polymer particles, including glass transition temperature (-70 to -20°C), oil absorption capacity (100 to 1,500 ml/100g), and molecular weight distribution (less than 3.0). These parameter changes ensure the polymer provides both oil retention and the necessary low-temperature performance characteristics.
Solution Approach 2:
The patent creates local quality differences within the rubber composition by incorporating oil-absorbent polymer particles with specific properties into the rubber matrix. The particles have high oil affinity locally while the overall composition maintains the flexibility needed for on-ice performance through the controlled glass transition temperature of the polymer particles.
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 effectively improves on-ice performance and rolling resistance performance while maintaining abrasion resistance, with the oil-absorbent polymer particles forming a micro-flexible phase that enhances adhesion to icy surfaces and reduces heat generation.
Implementation Method 1
oil-absorbent polymer particles having a glass transition temperature of −70 to −20° C., formed from a polymer whose molecular weight distribution is less than 3.0, and having an oil absorption of 100 to 1,500 ml/100 g
Implementation Method 2
the oil-absorbent polymer particles forming a micro-flexible phase that enhances adhesion to icy surfaces
Data Source
AI summary
A rubber composition for a studless tire according to an embodiment includes a rubber component containing a natural rubber and a polybutadiene rubber; oil-absorbent polymer particles having a glass transition temperature of −70 to −20° C., formed from a polymer whose molecular weight distribution is less than 3.0, and having an oil absorption of 100 to 1,500 ml/100 g; and an oil. The content of the oil-absorbent polymer particles is 0.5 to 25 parts by mass per 100 parts by mass of the rubber component. As a result, on-ice performance and rolling resistance performance can be improved.