Perfluoroelastomer Sealing Composition for High-Temperature Ozone Resistance
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Solution Overview
Problem
Existing sealing materials face challenges in ozone resistance under high-temperature environments, particularly when exposed to severe ozone conditions, and often require inorganic fillers that can cause contamination, while perfluoroelastomers with C-H bonds have poorer ozone resistance compared to perfluoroelastomers, and obtaining specific crosslinking agents is difficult.
Innovation Solution
A perfluoroelastomer composition comprising a perfluoroelastomer and a perylene-based compound without inorganic fillers, where the perylene compound is represented by a specific formula, is used to enhance ozone resistance, with the perylene compound content between 0.05 to 2 parts by weight per 100 parts of perfluoroelastomer, and the composition includes crosslinking agents to form a crosslinked product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic filler is blended to reduce rubber blending amount and maintain ozone resistance, then ozone resistance is improved, but device contamination occurs due to scattered filler particles
Solution Approach 1:
The invention extracts and eliminates the inorganic filler component from the sealing material composition, achieving ozone resistance through organic peroxide crosslinking agents instead. This removes the source of contamination while maintaining the required ozone resistance performance.
Solution Approach 2:
The invention changes the chemical composition parameters by using specific organic peroxide crosslinking agents (2,5-dimethyl-2,5-di(t-butylperoxy)hexane, dicumyl peroxide, or t-butyl peroxide) in controlled amounts (0.1-5 parts by weight per 100 parts rubber) to achieve crosslinking without inorganic fillers, thereby preventing contamination while maintaining ozone resistance.
2Ease of manufacture
If tetrafluoroethylene-propylene-based copolymer is used, then processing is easier, but ozone resistance deteriorates due to C-H bonds in polymer skeleton
Solution Approach 1:
The invention changes the polymer composition by using perfluoroelastomers with perfluoroalkyl groups (specifically those with 3-12 carbon atoms) instead of tetrafluoroethylene-propylene copolymers. This substitution eliminates C-H bonds from the polymer skeleton, dramatically improving ozone resistance while maintaining processability through proper compounding and crosslinking.
3Reliability
If specific crosslinking agent is used to improve ozone resistance, then ozone resistance is improved, but manufacturing difficulty increases due to limited availability of crosslinking agent
Solution Approach 1:
The invention identifies multiple organic peroxide compounds that can serve as effective crosslinking agents (2,5-dimethyl-2,5-di(t-butylperoxy)hexane, dicumyl peroxide, t-butyl peroxide). These are commonly available materials that can be used interchangeably to achieve the desired crosslinking and ozone resistance, making the manufacturing process more accessible and less restricted by material availability.
4Reliability
If perfluoroelastomer with perfluoroalkyl group having 3-12 carbon atoms is used, then ozone resistance under high-temperature environment is improved, but material cost increases
Solution Approach 1:
The invention optimizes the perfluoroalkyl group chain length to specifically 3-12 carbon atoms, which provides the optimal balance between ozone resistance and cost. This parameter range achieves sufficient molecular spacing and steric hindrance to prevent ozone attack while avoiding the excessive cost associated with longer chain perfluoroalkyl groups.
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 perfluoroelastomer composition with improved ozone resistance under high-temperature conditions without the need for inorganic fillers, maintaining material integrity and preventing contamination, and achieving effective crosslinking for enhanced sealing performance.
Implementation Method 1
a peroxide crosslinking agent; to form a crosslinked product
Implementation Method 2
improved ozone resistance under high-temperature conditions; maintaining material integrity
Data Source
AI summary
Provided are a perfluoroelastomer composition containing a perfluoroelastomer and a compound having a perylene skeleton, in which the compound having a perylene skeleton is a compound other than perylene and 3,4,9,10-perylenetetracarboxylic acid diimide; and a sealing material containing a crosslinked product of the perfluoroelastomer composition.