Elastomeric Composition Thermal Conductivity via Acetylene Carbon Black
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Solution Overview
Problem
Tires for civil engineering face significant internal heating issues due to improved reinforcing filler content, leading to potential auto-ignition and degradation, as existing solutions that enhance heat dissipation, such as using thermally conductive carbon blacks, compromise mechanical and hysteresis properties.
Innovation Solution
A rubber composition comprising a diene elastomer, a filler mix of acetylene-derived carbon black and inorganic filler, with a high content of acetylene-derived carbon black and a controlled inorganic filler percentage, along with a low amount of plasticizing oil and resin, to enhance thermal conductivity without degrading mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of reinforcing fillers is increased to improve wear resistance, then wear resistance is improved, but internal heating increases leading to auto-ignition risk
Solution Approach 1:
The patent uses a composite filler system combining carbon black (providing reinforcement and some thermal conductivity) with inorganic filler (providing reinforcement and heat dissipation). This composite approach allows simultaneous achievement of wear resistance through reinforcement and heat management through the thermally conductive inorganic filler, resolving the contradiction between strength and temperature control.
2Temperature
If acetylene-derived carbon black is used to improve thermal conductivity, then thermal conductivity is improved, but mechanical and hysteresis properties degrade
Solution Approach 1:
The patent creates a composite filler system where carbon black (including acetylene-derived varieties for thermal conductivity) is combined with inorganic filler. This composite approach balances the thermal conductivity benefits of carbon black with the mechanical reinforcement properties of inorganic filler, preventing degradation of mechanical and hysteresis properties while maintaining improved heat dissipation.
Solution Approach 2:
The patent optimizes the proportions of different fillers in the composite system, specifically controlling the ratio of carbon black to inorganic filler. By adjusting these parameters, the patent achieves the optimal balance between thermal conductivity and mechanical properties, resolving the contradiction through parameter optimization rather than using single-component fillers.
3Temperature
If high content of plasticizers is used to improve heat dissipation, then heat dissipation is improved, but mechanical and hysteresis properties degrade
Solution Approach 1:
The patent replaces the mechanical/chemical approach of using plasticizers to improve heat dissipation with a thermal conduction approach using inorganic filler. Instead of relying on plasticizers to modify the rubber matrix for heat dissipation, the patent introduces thermally conductive inorganic filler particles that provide direct thermal pathways, achieving heat dissipation without the mechanical property degradation caused by high plasticizer content.
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 thermal conductivity and reduced hysteresis while maintaining mechanical integrity, as demonstrated by increased thermal conductivity and reduced tan (δ)max values, with the acetylene-derived carbon black and silica blend effectively managing heat dissipation in tire treads.
Implementation Method 1
the carbon black comprises at least one acetylene-derived carbon black, with a content of greater than 3 phr, the amount of acetylene-derived carbon black representing more than 50% of the carbon black present in the composition as a weight fraction
Data Source
AI summary
A rubber composition based on at least one diene elastomer, a filler that contains carbon black and an inorganic filler, and a crosslinking system, wherein the inorganic filler content is greater than or equal to 5 parts by weight per hundred parts by weight of elastomer, phr, and represents at most 50% as a weight fraction of the whole of the total filler of the composition, and wherein the carbon black includes at least one acetylene-derived carbon black, with a content of greater than 3 phr, the amount of acetylene-derived carbon black representing more than 50% of the carbon black present in the composition as a weight fraction, and wherein the composition contains a plasticizing oil or a plasticizing resin with a total content of plasticizing oil and plasticizing resin of less than 30 phr.