Functionalized Wax in Rubber Tread Compounds for Wet Skid Resistance
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Solution Overview
Problem
Current rubber tire compositions lack effective solutions for enhancing wet traction performance and skid resistance, as the mechanisms behind these properties are not fully understood and existing waxes do not significantly impact bulk mechanical properties.
Innovation Solution
Incorporating fluorinated hydrocarbon waxes, silicone-containing waxes, or chlorinated hydrocarbon waxes into rubber compositions to alter their hydrophilic/hydrophobic properties, which improves wet skid resistance without compromising bulk mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wax is used in rubber composition, then bulk mechanical properties are maintained, but wet skid resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by substituting conventional hydrocarbon waxes with fluorinated hydrocarbon waxes, silicone-containing waxes, or chlorinated hydrocarbon waxes. These alternative waxes have different chemical compositions and surface properties that alter the hydrophilic/hydrophobic balance of the rubber composition, thereby improving wet skid resistance while maintaining bulk mechanical properties through careful selection of wax types and concentrations.
2Reliability
If fluorinated hydrocarbon wax or silicone-containing wax is added to alter hydrophilic/hydrophobic properties, then wet skid resistance is enhanced, but composition complexity increases
Solution Approach 1:
The patent employs multi-functionality by selecting fluorinated hydrocarbon waxes, silicone-containing waxes, or chlorinated hydrocarbon waxes that simultaneously provide wet skid resistance enhancement and maintain bulk mechanical properties. These alternative waxes serve multiple functions: they modify surface hydrophilic/hydrophobic characteristics for improved wet traction while also preserving the structural integrity and mechanical performance of the rubber composition, thereby reducing the need for additional separate additives.
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 use of these waxes enhances wet skid resistance by adjusting the surface hydrophobicity/hydrophilicity of tire treads, improving water drainage and adhesive interactions with the road, while maintaining dynamic viscoelasticity and tensile strength.
Implementation Method 1
the use of fluorinated hydrocarbon waxes, silicone-containing waxes, or chlorinated hydrocarbon waxes to replace all or a portion of a conventional wax in a rubber composition allows for the alteration of the hydrophilic/hydrophobic properties of the rubber composition
Implementation Method 2
the rate of water drainage between the tread rubber and the road
Implementation Method 3
the possible adhesive interactions between the tread rubber and the road
Data Source
AI summary
Disclosed herein are rubber compositions suitable for use in tire treads comprising (a) at least one conjugated diene polymer or copolymer; (b) at least one filler; (c) a curative package; and (d) at least one of: (i) from 0.2 to 10 phr of at least one halogenated hydrocarbon wax, or (ii) from 0.2 to 10 phr of at least one silicone-containing wax comprising a functionalized polyalkylsiloxane, a functionalized polyalkylsilsesquioxane resin, or combinations thereof. In certain embodiments, the at least one halogenated hydrocarbon wax is a chlorinated hydrocarbon or a fluorinated hydrocarbon wax.