Perfluoroelastomer Composition with Organic Dicarboxylic Acid Catalyst
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Solution Overview
Problem
Perfluoroelastomers with nitrogen-containing curing sites face issues of 'scorch' during kneading and uncontrollable crosslinking rates due to excessively active curing agents, limiting their use in thermal diffusion and plasma CVD processes.
Innovation Solution
A perfluoroelastomer composition incorporating a tertiary amine and an organic dicarboxylic acid, specifically in a catalyst mixture, to inhibit scorching and control crosslinking rates, comprising a perfluoroelastomer with a nitrogen-containing curing site, a tertiary amine, and an organic dicarboxylic acid in a controlled ratio, which prevents scorching and allows for adjustable crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a nitrogen-containing compound with high activity is used as a curing agent, then crosslinking efficiency is improved, but scorch occurs during kneading and crosslinking rate cannot be controlled
Solution Approach 1:
The curing catalyst system is segmented into two distinct components: a tertiary amine component and an organic dicarboxylic acid component. These components are used separately and combine during crosslinking to achieve the desired effect, allowing independent control of each component's properties and preventing premature reaction during kneading.
Solution Approach 2:
The organic dicarboxylic acid acts as an intermediary substance that moderates the reaction between the tertiary amine and the cyano groups. This intermediary controls the crosslinking rate by regulating the interaction between the other components, preventing excessive reactivity and scorch while maintaining crosslinking efficiency.
2Reliability
If a traditional curing catalyst like tin compound or phosphorus compound is used, then crosslinking can be achieved, but impurity metals are introduced which are disfavored in semiconductor producing equipment
Solution Approach 1:
The invention replaces traditional metal-based catalysts with organic compounds (tertiary amine and organic dicarboxylic acid) that leave no metal impurities. These organic catalysts are consumed during the crosslinking process and decompose into non-harmful byproducts, eliminating the contamination issue associated with tin and phosphorus compounds in semiconductor applications.
Solution Approach 2:
The invention changes the chemical nature of the catalyst from inorganic metal compounds to organic compounds. This parameter change in catalyst composition eliminates metal impurities while maintaining catalytic functionality, making the system suitable for semiconductor producing equipment where metal contamination must be avoided.
3Adaptability or versatility
If crosslinking conditions such as temperature vary, then adaptability is improved, but crosslinking rate cannot be controlled consistently
Solution Approach 1:
The catalyst system is designed to be dynamic in its behavior across different temperatures. The tertiary amine and organic dicarboxylic acid components exhibit temperature-dependent reactivity, allowing the crosslinking rate to be controlled by adjusting processing temperature while maintaining consistent performance across varying conditions.
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 effectively prevents scorching and allows for controlled crosslinking, enabling stable processing and molding of perfluoroelastomer articles with improved heat and chemical stability.
Implementation Method 1
a catalyst mixture comprising: a tertiary amine; and an organic dicarboxylic acid represented by general formula (1) or (2) in an amount of 0.4 to 2 mol per mol of the tertiary amine
Data Source
AI summary
The present invention provides a perfluoroelastomer composition comprising: a perfluoroelastomer having a nitrogen-containing curing site; and a catalyst mixture comprising: a tertiary amine; and an organic dicarboxylic acid represented by general formula (1) or (2) in an amount of 0.4 to 2 mol per mol of the tertiary amine:HOOC—COOH (1)HOOC-A-COOH (2)wherein A in formula (2) is an alkyl group having 1 to 10 carbon atoms or a phenyl group, which may be partially or fully fluorinated. Also disclosed is a perfluoroelastomer molded article obtained from the composition.