Cross-Linked Fluororubber Hose for High-Temperature Elongation
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Solution Overview
Problem
Fluororubber hoses used in high-temperature applications, such as turbocharger hoses, face limitations in mechanical properties like strength and elongation at high temperatures, despite their good heat-aging and oil resistance.
Innovation Solution
A multilayer hose with a cross-linked fluororubber layer, containing specific amounts of carbon black and a fluororubber composition, achieving a loss modulus of 400 kPa to 6000 kPa and storage modulus of 1500 kPa to 20,000 kPa, enhancing mechanical properties at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluororubber is used for heat-resistant hoses, then heat-aging resistance and oil resistance are improved, but mechanical properties at high temperatures (strength and elongation) are insufficient
Solution Approach 1:
The patent uses a composite material system consisting of fluororubber (providing heat and oil resistance) combined with specific carbon black fillers (providing mechanical reinforcement). This composite approach allows the hose to simultaneously achieve excellent heat-aging resistance, oil resistance, and improved high-temperature mechanical properties through the synergistic effects of the rubber matrix and reinforcing filler.
Solution Approach 2:
The patent optimizes the carbon black content parameter within a specific range (5-50 parts by mass per 100 parts by mass of fluororubber) to balance heat resistance, mechanical properties, and processing characteristics. By precisely controlling this compositional parameter, the invention achieves improved tensile strength and elongation at high temperatures while maintaining the inherent heat-aging and oil resistance of fluororubber.
2Reliability
If fluororubber is used for heat-resistant hoses, then heat-aging resistance and oil resistance are improved, but mechanical properties at high temperatures (elongation) are insufficient
Solution Approach 1:
The patent uses a composite material system consisting of fluororubber (providing heat and oil resistance) combined with specific carbon black fillers (providing mechanical reinforcement). This composite approach allows the hose to simultaneously achieve excellent heat-aging resistance, oil resistance, and improved high-temperature mechanical properties through the synergistic effects of the rubber matrix and reinforcing filler.
Solution Approach 2:
The patent optimizes the carbon black content parameter within a specific range (5-50 parts by mass per 100 parts by mass of fluororubber) to balance heat resistance, mechanical properties, and processing characteristics. By precisely controlling this compositional parameter, the invention achieves improved tensile strength and elongation at high temperatures while maintaining the inherent heat-aging and oil resistance of fluororubber.
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 solution provides a hose with improved mechanical properties at high temperatures, including increased strength and elongation, making it suitable for demanding applications like turbocharger hoses.
Implementation Method 1
a fluororubber hose having a specific loss modulus is excellent in mechanical properties at high temperatures
Implementation Method 2
a cross-linked fluororubber layer which is obtainable by cross-linking a fluororubber composition
Data Source
AI summary
The present invention provides a hose excellent in mechanical properties at high temperatures. The hose of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E" of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160°C, tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz).