Inner Liner Rubber Composition With Lower Hysteresis
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Solution Overview
Problem
Existing rubber compositions for tire inner liners face a trade-off between reducing rolling resistance (hysteresis) and maintaining good physical properties like air permeability, as fillers like carbon black negatively impact hysteresis while polymer blends impair air permeability.
Innovation Solution
A cross-linkable rubber composition comprising halogenated butyl rubber, a terpolymer of ethylene, acrylic ester, and maleic anhydride, and optionally natural rubber and fillers, which balances hysteresis and air permeability by reducing the Payne effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fillers like carbon black are used to improve physical properties, then strength and air permeability are improved, but hysteresis increases and rolling resistance worsens
Solution Approach 1:
The patent extracts the harmful filler components (carbon black and other traditional fillers) from the rubber composition. By removing these fillers that cause high hysteresis, the composition achieves low rolling resistance while maintaining adequate physical properties through the halogenated butyl rubber matrix and optimized compounding agents alone.
2Loss of energy
If filler amount is reduced to improve hysteresis property, then rolling resistance is reduced, but physical properties like air permeability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber matrix by using halogenated butyl rubber with specific halogen content (3-15 mass%) and incorporating functionalized polymers. This parameter change allows the rubber to achieve both low hysteresis and good physical properties without relying on traditional fillers, breaking the conventional trade-off relationship.
3Loss of energy
If polymer blend is changed to improve hysteresis property, then rolling resistance is reduced, but physical properties like air permeability are impaired
Solution Approach 1:
The patent creates a composite rubber composition by combining halogenated butyl rubber with functionalized polymers (polymer containing carboxyl, hydroxyl, or amine groups). This composite approach achieves synergistic effects where the functional groups interact with the halogenated butyl rubber to simultaneously reduce hysteresis and maintain or improve physical properties.
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 lower hysteresis and maintains good physical properties such as air permeability, making it suitable for tire inner liners.
Implementation Method 1
Hysteresis is the primary cause of the rolling resistance of a pneumatic tyre. Fillers like carbon black negatively impact the hysteresis property.
Implementation Method 2
using a terpolymer of ethylene, acrylic ester and maleic anhydride as resin in a carefully chosen phr amount reduces the Payne effect, and achieves a lower hysteresis
Implementation Method 3
a cross-linkable rubber composition comprising a halogenated butyl rubber, a filler, and a resin wherein the resin is a terpolymer of ethylene, acrylic ester and maleic anhydride
Data Source
AI summary
The present invention relates to a cross-linkable rubber composition, the cross-linkable rubber composition comprising a halogenated butyl rubber, a filler, and a resin. The resin is a terpolymer of ethylene, acrylic ester and maleic anhydride and is present in an amount ranging from ≥ 1 to ≤ 20 phr.