Graphite-Reinforced Rubber for Vulcanization Bladder Heat Transfer
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Solution Overview
Problem
Current rubber compositions used in vulcanization bladders and tires face challenges in achieving both good thermal conductivity and durability, particularly in transmitting heat efficiently during the vulcanization process and maintaining performance under high temperatures and mechanical stress.
Innovation Solution
A rubber composition containing 50 parts or greater by mass of a filler with graphite having a nitrogen adsorption specific surface area of not less than 16 m²/g and a bulk density of not less than 0.10 g/cm³, combined with normal carbon black, to achieve thermal conductivity of not less than 0.45 W/m·K, enhancing both thermal conductivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional rubber composition is used in vulcanization bladder, then durability is maintained, but thermal conductivity is insufficient for efficient heat transmission
Solution Approach 1:
The patent uses a composite filler system combining graphite (10-40 parts) with carbon black (30-60 parts) to create a rubber composition that achieves both high thermal conductivity (≥0.45 W/m·K) and durability. The graphite provides exceptional thermal conduction while carbon black reinforces the rubber matrix, resolving the contradiction between thermal performance and durability.
Solution Approach 2:
The patent specifies precise parameter ranges for graphite (nitrogen adsorption specific surface area ≥16 m²/g, bulk density ≥0.10 g/cm³) and carbon black to optimize the balance between thermal conductivity and mechanical durability. By controlling these parameters within specific ranges, the composition achieves thermal conductivity ≥0.45 W/m·K while maintaining durability under vulcanization conditions.
2Productivity
If graphite with high thermal conductivity is added to rubber composition, then heat transmission speed increases, but durability under mechanical stress deteriorates
Solution Approach 1:
The patent creates a composite filler system where graphite (10-40 parts) provides thermal conductivity for fast vulcanization, while carbon black (30-60 parts) provides mechanical reinforcement for durability. This composite approach allows the rubber composition to achieve thermal conductivity ≥0.45 W/m·K (enabling rapid heat transmission) while maintaining tensile strength and elasticity under mechanical stress during vulcanization and tire operation.
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 proposed rubber composition effectively improves thermal conductivity and durability, leading to more efficient vulcanization processes and improved tire performance by ensuring rapid heat transmission and resistance to mechanical stress.
Implementation Method 1
the rubber composition forming the vulcanization bladder is also required to achieve good thermal conductivity... the speed of heat transmission to a tire in a vulcanization step is increased by using a vulcanization bladder rubber composition containing carbon fibers having good thermal conductivity
Implementation Method 2
a filler containing a graphite having a nitrogen adsorption specific surface area of not less than 16 m²/g
Data Source
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AI summary
Provided are a rubber composition that can achieve both good thermal conductivity and good durability, and a vulcanization bladder and a pneumatic tire produced by using the rubber composition. The rubber composition contains 50 parts by mass or greater of a filler containing a graphite having a nitrogen adsorption specific surface area of not less than 16 m2/g and a bulk density of not less than 0.10 g/cm3, per 100 parts by mass of a rubber component, and has a thermal conductivity of not less than 0.45 W/m·K.