Fluoroelastomer Composition With Low Oxide Acid Acceptor System
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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 these chemical environments.
Innovation Solution
A fluoroelastomer composition comprising a polyol-crosslinkable fluoroelastomer, a cross-linking agent, a crosslinking accelerator, and at least one acid acceptor selected from basic magnesium carbonate or magnesium phosphate, with specific ratios and components to enhance resistance, including a vinylidene fluoride unit and trimagnesium phosphate octahydrate, resulting in a molded article with improved hardness and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crosslinking agents and acid acceptors are used in fluoroelastomer composition, then crosslinking efficiency is achieved, but resistance to organic acids and carboxylate ester compounds deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by restricting divalent metal oxide content to less than 1 part by mass and specifying particular acid acceptors (basic magnesium carbonate or magnesium phosphate) with defined content ranges (2-40 parts by mass), thereby improving resistance to organic acids and carboxylate ester compounds while maintaining crosslinking efficiency
Solution Approach 2:
The patent creates a composite crosslinking system combining polyol-crosslinkable fluoroelastomer with specific crosslinking agents and acid acceptors in defined proportions, forming a composite material that achieves both crosslinking efficiency and enhanced chemical resistance
2Productivity
If divalent metal oxide content is increased to improve crosslinking, then crosslinking speed increases, but resistance to organic acids and carboxylate ester compounds decreases
Solution Approach 1:
The patent optimizes the parameter of divalent metal oxide content by setting it to less than 1 part by mass, and compensates for crosslinking speed through optimized acid acceptor content (2-40 parts by mass) and crosslinking agent content (0.5-15 parts by mass), thereby achieving both fast crosslinking and high chemical resistance
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 in biodiesel fuels and air management systems, demonstrating improved durability and chemical stability.
Implementation Method 1
a cross-linking agent for polyol crosslinking (b) and a crosslinking accelerator (c)
Implementation Method 2
at least one acid acceptor selected from the group consisting of a basic magnesium carbonate and a magnesium phosphate (d)
Data Source
AI summary
There is provided 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 the group consisting of 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).