Fluoroelastomer Composition Steam Resistance via Magnesium Oxide
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Solution Overview
Problem
Existing crosslinkable fluoroelastomer compositions with high amounts of metal compounds like calcium hydroxide result in inadequate steam resistance in formed articles, leading to premature degradation when used in high-temperature steam environments.
Innovation Solution
A crosslinkable fluoroelastomer composition containing a fluoroelastomer with bromine and/or iodine atoms, a polyfunctional cross-linking aid, an organic peroxide, and a metal compound selected from magnesium oxide or a solid solution of aluminum oxide and magnesium oxide, with the metal compound content ranging from 0.05 to 0.50 parts by mass based on 100 parts by mass of the fluoroelastomer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high amounts of metal compounds like calcium hydroxide are used in the fluoroelastomer composition, then the composition can be processed and cured, but the steam resistance of the formed article becomes inadequate and premature degradation occurs in high-temperature steam environments
Solution Approach 1:
The patent changes the chemical composition parameters by replacing calcium hydroxide with magnesium oxide or aluminum oxide-magnesium oxide solid solution, and optimizing the metal compound content to 0.01-1.0 parts by mass per 100 parts by mass of fluoroelastomer. This parameter change resolves the contradiction by achieving both processability and steam resistance.
Solution Approach 2:
The patent uses composite metal compounds (aluminum oxide-magnesium oxide solid solution) instead of single metal compounds. This composite approach provides both the necessary processability and superior steam resistance, resolving the contradiction between ease of manufacture and reliability in steam environments.
2Ease of manufacture
If conventional metal compounds are used in the fluoroelastomer composition, then the composition can be formulated, but the formed article corrodes metal members when used in contact with them
Solution Approach 1:
The patent changes the metal compound from calcium hydroxide to magnesium oxide or aluminum oxide-magnesium oxide solid solution, and controls the content within 0.01-1.0 parts by mass per 100 parts by mass of fluoroelastomer. This parameter change eliminates metal corrosion while maintaining formulability.
Solution Approach 2:
The patent uses magnesium oxide which acts as a temporary protective layer during processing and then decomposes to provide long-term corrosion resistance. This resolves the contradiction by providing both ease of manufacture and prevention of metal corrosion.
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 excellent steam resistance and reduces the likelihood of metal member corrosion, even when in contact with the formed article in high-temperature steam environments.
Implementation Method 1
an organic peroxide
Implementation Method 2
a crosslinkable fluoroelastomer composition containing a fluoroelastomer containing bromine atom and/or iodine atom, a polyfunctional cross-linking aid, an organic peroxide
Implementation Method 3
the content of the metal compound is 0.05 to 0.50 parts by mass based on 100 parts by mass of the fluoroelastomer... allowing to obtain a formed article having excellent steam resistance
Implementation Method 4
allowing to obtain a formed article that is less likely to corrode a metal member even when used in contact with the metal member
Data Source
AI summary
Provided is a crosslinkable fluoroelastomer composition containing a fluoroelastomer containing bromine atom and/or iodine atom, a polyfunctional cross-linking aid, an organic peroxide, and at least one metal compound selected from the group consisting of magnesium oxide and a solid solution of aluminum oxide and magnesium oxide, wherein the content of the metal compound is 0.05 to 0.50 parts by mass based on 100 parts by mass of the fluoroelastomer.