Fluororubber Composition for Metal-Detectable Low-Set O-Rings
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Solution Overview
Problem
Existing fluororubber compositions used in food production facilities fail to ensure detection by metal detectors for tiny rubber pieces and do not provide adequate compression set resistance, which is crucial for maintaining product integrity and safety.
Innovation Solution
A fluororubber composition is developed by compounding fluororubber with triiron tetraoxide, having a BET specific surface area of 4.0 m^2/g or less, at a volume fraction of 7.0 vol% or more, to enhance detectability by metal detectors and improve compression set resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluororubber is compounded with conventional fillers (carbon black or white carbon), then the rubber has good basic sealing properties, but tiny rubber pieces cannot be detected by metal detectors
Solution Approach 1:
The invention changes the physical and chemical parameters of the filler by using triiron tetraoxide (Fe3O4) with specific properties: BET specific surface area of 4.0 m²/g or less, and volume fraction of 7.0 vol% or more. This parameter change enables the filler to provide both detection capability (magnetic properties for metal detector detection) and compression set resistance, while eliminating the detection problem associated with conventional non-magnetic fillers like carbon black
Solution Approach 2:
The invention creates a composite material system by compounding fluororubber with triiron tetraoxide filler. This composite provides multiple functions simultaneously: the triiron tetraoxide provides magnetic properties for metal detector detection, while also improving compression set resistance. The composite structure allows tiny rubber pieces (1 mm or less) to be detected, solving the detection problem that cannot be addressed by simple metal detectors alone
2Reliability
If O-rings are made with conventional rubber materials, then they provide basic sealing function, but they lack sufficient compression set resistance characteristics affecting product life
Solution Approach 1:
The invention improves compression set resistance by changing the filler parameters: using triiron tetraoxide with BET specific surface area of 4.0 m²/g or less and volume fraction of 7.0 vol% or more. This specific parameter range optimizes the filler-rubber interaction, enhancing the crosslinked network structure and improving compression set resistance characteristics, thereby extending product life
3Reliability
If metal oxide (black iron oxide) is added to O-rings for detection, then detection capability is improved, but no information is provided regarding product functions or material properties
Solution Approach 1:
The invention specifies precise parameter ranges for triiron tetraoxide: BET specific surface area of 4.0 m²/g or less and volume fraction of 7.0 vol% or more. These parameter specifications provide complete material property information, enabling both detection capability and excellent compression set resistance. The defined parameters serve as guiding values for achieving optimal performance, eliminating the information gap present in previous proposals
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 crosslinked product from this composition can be detected by metal detectors even for pieces as small as 1 mm and exhibits excellent compression set resistance, ensuring the safety and integrity of food products.
Implementation Method 1
fluororubber composition in which fluororubber is compounded with triiron tetraoxide having a BET specific surface area of 4.0 m^2/g or less... can be detected by a metal detector even if it is tiny pieces
Implementation Method 2
exhibits excellent compression set resistance, ensuring the safety and integrity of food products
Data Source
AI summary
A fluororubber composition in which fluororubber is compounded with triiron tetraoxide having a BET specific surface area of 4.0 m2/g or less at a ratio of 7.0 vol% or more as a volume fraction. A crosslinked product obtained by the fluororubber composition according to the present invention can be detected 1 mm pieces thereof by using a metal detector ND-840, produced by Nissin Electronics Co., Ltd., under the detection sensitivity conditions (Fe: 0.6 in diameter, SUS: 1.5 in diameter). Further, the compression set of the crosslinked product using an O-ring at 175°C after 70 hours is 21% or less, and thus the crosslinked product can be effectively used for gaskets, O-rings, and the like for food production facilities, food machinery, automobiles, etc.