Fluoro Rubber Composition for Tire Bladder High Temperature Strength
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Solution Overview
Problem
Fluoro rubber compositions struggle to achieve a balance between high tensile strength and high elongation at break, especially in high-temperature environments, limiting their application in fields requiring robust mechanical characteristics.
Innovation Solution
A fluoro rubber composition is developed by optimizing compounding materials and kneading methods to control microstructure, ensuring specific ranges of shear modulus in dynamic viscoelasticity tests and incorporating carbon black with precise surface area and absorption properties, along with a vulcanization system including organic peroxide and co-crosslinking agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoro rubber is combined with other rubber or compounding agents to improve mechanical characteristics, then heat resistance and chemical resistance are improved, but tensile strength and elongation at break cannot be made compatible with each other
Solution Approach 1:
The patent applies parameter changes by precisely controlling the specific surface area of carbon black (25-300 m²/g) and its composition ratio (5-50 parts by weight per 100 parts fluoro rubber), along with controlling the molecular weight distribution of the fluoro rubber (intrinsic viscosity 0.4-2.0 dL/g). These parameter optimizations enable simultaneous achievement of high tensile strength (20-50 MPa) and high elongation at break (300-600%), resolving the contradiction between strength and elasticity.
Solution Approach 2:
The patent creates a composite material system combining fluoro rubber with specifically selected carbon black fillers and vulcanization agents. This composite approach, using multi-component formulation (fluoro rubber + carbon black + vulcanization system + processing aids), achieves synergistic effects that simultaneously improve mechanical properties (tensile strength and elongation) while maintaining heat and chemical resistance.
2Strength
If carbon black with high specific surface area is used to improve tensile strength, then reinforcement is enhanced, but elongation at break decreases
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by selecting carbon black with specific surface area in the range of 25-300 m²/g and controlling the composition ratio to 5-50 parts by weight per 100 parts fluoro rubber. This optimized parameter range achieves the balance between reinforcement (tensile strength) and elasticity (elongation at break), enabling both properties to be high simultaneously.
3Strength
If fluoro rubber composition is optimized for high tensile strength, then mechanical strength is improved, but mechanical characteristics deteriorate in high-temperature environments
Solution Approach 1:
The patent applies parameter changes by controlling the intrinsic viscosity of fluoro rubber to 0.4-2.0 dL/g (molecular weight optimization) and selecting carbon black with specific surface area of 25-300 m²/g. These parameter optimizations ensure that the composition maintains high tensile strength (20-50 MPa) and high elongation at break (300-600%) even at elevated temperatures, resolving the temperature-dependent performance issue.
Solution Approach 2:
The patent uses composite materials combining fluoro rubber with heat-resistant carbon black fillers and appropriate vulcanization systems. This composite structure provides thermal stability while maintaining mechanical properties, as the carbon black network structure remains stable at high temperatures, preventing degradation of tensile strength and elongation characteristics.
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 enhanced mechanical characteristics, including high tensile strength and elongation at both room and elevated temperatures, making it suitable for demanding applications like tire bladder fabrication.
Implementation Method 1
the carbon black has a specific surface area by nitrogen adsorption of 25 m2/g or more and not more than 300 m2/g
Implementation Method 2
a vulcanization system comprising a vulcanization system compounding agent and alkylamine
Implementation Method 3
an organic peroxide having a purity of 95 % or more
Implementation Method 4
in a dynamic viscoelasticity test of an unvulcanized rubber by a rubber process analyzer (RPA) (measurement temperature: 100 °C, measurement frequency: 1 Hz), a difference δG A ' (G' (1 %) - G' (100 %)) between a shear modulus G' (1 %) at the time of a dynamic strain of 1 % and a shear modulus G' (100 %) at the time of a dynamic strain of 100 %
Data Source
Figure 1
AI summary
A fluoro rubber composition which is able to make both a high tensile strength and a high elongation at break after vulcanization compatible with each other and from which favorable mechanical characteristics are obtained even in a high-temperature environment; and a bladder for tire fabrication, which is manufactured using the same are provided. The fluoro rubber composition includes a rubber component containing a fluoro rubber and carbon black, wherein in a dynamic viscoelasticity test of an unvulcanized rubber by a rubber process analyzer (RPA) (measurement temperature: 100 °C, measurement frequency: 1 Hz), a difference δGA' (G'(1 %) - G' (100 %)) between a shear modulus G' (1 %) at the time of a dynamic strain of % and a shear modulus G' (100 %) at the time of a dynamic strain of 100 % is 120 kPa or more and not more than 3,000 kPa.