Compounded Elastomer Thermal Transfer via Carbon Black Crystallinity
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Solution Overview
Problem
Elastomeric materials used in tire bladders face challenges in achieving a balance between thermal conductivity and mechanical properties, with current additives either improving heat transfer at the expense of mechanical strength or vice versa, leading to limited cycle life and manufacturing efficiency.
Innovation Solution
A compounded elastomer is developed using a combination of carbon blacks, including a partially crystallized carbon black and a furnace black, which enhances both thermal conductivity and mechanical properties by optimizing the Raman microcrystalline planar size, surface energy, and crystallinity, resulting in improved heat transfer efficiency and extended cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional carbon black additives are used to improve thermal conductivity, then heat transfer efficiency is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the crystallinity of carbon black particles within a specific range (10-40%) and adjusting the ratio of different carbon black types. This optimization allows the material to achieve improved thermal conductivity while maintaining mechanical strength, resolving the traditional trade-off between these two properties.
Solution Approach 2:
The patent uses composite materials by combining multiple types of carbon black (including crystalline carbon black and amorphous carbon black) in specific ratios. This composite approach allows the material to benefit from both the high thermal conductivity of crystalline structures and the mechanical reinforcement provided by amorphous structures, simultaneously improving heat transfer and maintaining strength.
2Temperature
If conventional carbon black additives are used to improve thermal conductivity, then heat transfer efficiency is improved, but cycle life deteriorates
Solution Approach 1:
The patent optimizes the crystallinity parameter of carbon black to fall within 10-40%, which provides an optimal balance between thermal conductivity and mechanical durability. This parameter control ensures that the material can withstand repeated thermal cycling and mechanical stress, thereby extending the service life of tire bladders while maintaining heat transfer efficiency.
Solution Approach 2:
By creating a composite structure with controlled proportions of crystalline and amorphous carbon black, the patent achieves a material that possesses both high thermal conductivity for efficient heat dissipation and enhanced mechanical properties for durability. This composite approach directly addresses the cycle life issue by providing a material that can endure repeated use conditions.
3Temperature
If carbon black with high crystallinity is used, then thermal conductivity is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent precisely controls the crystallinity parameter of carbon black within the range of 10-40%, avoiding both low crystallinity (which provides poor thermal conductivity) and high crystallinity (which compromises mechanical properties). This optimized parameter range ensures that the carbon black particles provide adequate thermal pathways while maintaining the flexibility and strength of the elastomeric matrix.
Solution Approach 2:
The patent applies local quality by creating regions with different carbon black characteristics - crystalline regions for thermal conductivity and amorphous regions for mechanical reinforcement. This spatial distribution of different carbon black types within the elastomeric matrix allows simultaneous optimization of both thermal and mechanical properties at the local level.
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 compounded elastomer exhibits superior thermal conductivity and mechanical strength, enabling faster manufacturing cycles and increased bladder lifetime, while maintaining robust mechanical properties.
Implementation Method 1
the compound elastomer may include a first carbon black and a second carbon black different from the first carbon black, the second carbon black a partially crystallized carbon black... The compounded elastomer can have a thermal conductivity of greater than 0.29 W/mK
Implementation Method 2
A compounded butyl elastomer is provided, the compounded butyl elastomer comprising at least two different carbon blacks wherein the butyl elastomer exhibits a thermal transfer efficiency of greater than 0.25 W/mK
Data Source
AI summary
A compounded elastomer comprising an elastomeric resin, a first carbon black, and a second carbon black different from the first carbon black. The second carbon black is a partially crystallized carbon black having an OAN structure of greater than 120 cm3/100 g and less than 200 cm3/100 g, a surface energy of less than 10 mJ/m2 and a Raman microcrystalline planar size (La) of greater than or equal to 25 Å and less than or equal to 50 Å.