Fluoroelastomer Composition for Organic Acid and Ester Resistance
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Solution Overview
Problem
Molded articles from crosslinked fluoroelastomers exhibit limited durability against organic acids and carboxylate ester compounds, necessitating improved resistance in such chemical environments.
Innovation Solution
A fluoroelastomer composition comprising a polyol-crosslinkable fluoroelastomer, a cross-linking agent, a crosslinking accelerator, and an acid acceptor, specifically using basic magnesium carbonate or magnesium phosphate, with controlled proportions to enhance resistance, and a vinylidene fluoride unit for improved chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crosslinking agents and acid acceptors are used in fluoroelastomer composition, then crosslinking reaction proceeds, but resistance to organic acids and carboxylate ester compounds is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by introducing basic magnesium carbonate and magnesium phosphate as specific acid acceptors, and controlling divalent metal oxide content to less than 1 part by mass per 100 parts by mass of fluoroelastomer. This parameter optimization resolves the contradiction by achieving both adequate crosslinking and improved resistance to organic acids and carboxylate ester compounds.
Solution Approach 2:
The patent creates a composite fluoroelastomer composition combining the base fluoroelastomer with specific crosslinking agents (polyol-crosslinkable), crosslinking accelerators, and acid acceptors (basic magnesium carbonate or magnesium phosphate). This composite approach enables simultaneous achievement of crosslinking functionality and enhanced chemical resistance to organic acids and esters.
2Productivity
If divalent metal oxide content is increased to improve crosslinking, then crosslinking efficiency improves, but resistance to organic acids and carboxylate ester compounds deteriorates
Solution Approach 1:
The patent establishes a critical parameter threshold by limiting divalent metal oxide content to less than 1 part by mass per 100 parts by mass of fluoroelastomer. This parameter control resolves the contradiction by preventing excessive divalent metal oxide that would harm chemical resistance, while maintaining sufficient crosslinking through alternative mechanisms using polyol crosslinking agents and basic magnesium carbonate or magnesium phosphate.
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 provides molded articles with enhanced resistance to organic acids and carboxylate ester compounds, suitable for applications like biodiesel fuel and air management systems, maintaining mechanical properties and sealability.
Implementation Method 1
a content of a divalent metal oxide is less than 1 part by mass with respect to 100 parts by mass of the fluoroelastomer (a)... at least one acid acceptor selected from the group consisting of a basic magnesium carbonate and a magnesium phosphate
Implementation Method 2
a cross-linking agent for polyol crosslinking (b)... crosslinking a fluoroelastomer, the fluoroelastomer is compounded with a cross-linking agent
Data Source
AI summary
A fluoroelastomer composition containing (a) a polyol-crosslinkable fluoroelastomer, (b) a cross-linking agent for polyol crosslinking, (c) a crosslinking accelerator; and (d) at least one acid acceptor selected from basic magnesium carbonate and magnesium phosphate, wherein the content of a divalent metal oxide is lower than 1 part by mass with respect to 100 parts by mass of the fluoroelastomer (a). Also disclosed is a molded article obtained by crosslinking the fluoroelastomer composition.