Ethylene-Acrylic Rubber Composition for Bonded Piston Seals
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Solution Overview
Problem
Existing bonded piston sealings (BPS) require secondary crosslinking, which increases process costs and can degrade compression set and crosslinking bonding properties, especially when using sulfur crosslinking-based acrylic rubber.
Innovation Solution
An ethylene-acrylic rubber composition with 1 to 7 PHR of calcium hydroxide is mixed with a binary ethylene-acrylic rubber polymer, allowing for primary peroxide-crosslinking without secondary crosslinking, enhancing compression set and crosslinking bonding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If secondary crosslinking is performed to improve compression set, then compression set improves, but process cost increases and crosslinking bonding property deteriorates
Solution Approach 1:
The invention extracts and eliminates the secondary crosslinking step from the traditional two-step crosslinking process. By using peroxide-crosslinkable binary ethylene-acrylic rubber and optimizing the primary crosslinking conditions, the patent achieves both compression set improvement and crosslinking bonding enhancement without requiring the separate secondary crosslinking step, thereby reducing process cost and avoiding the deterioration of crosslinking bonding property
Solution Approach 2:
The invention changes the crosslinking parameters by using peroxide-based primary crosslinking with specific catalysts and optimizing temperature and time conditions. This parameter optimization allows the primary crosslinking to achieve both compression set improvement and crosslinking bonding enhancement simultaneously, making the secondary crosslinking step unnecessary
2Reliability
If secondary crosslinking is performed to improve compression set, then compression set improves, but crosslinking bonding property deteriorates
Solution Approach 1:
The invention extracts and eliminates the secondary crosslinking step from the traditional two-step crosslinking process. By using peroxide-crosslinkable binary ethylene-acrylic rubber and optimizing the primary crosslinking conditions, the patent achieves both compression set improvement and crosslinking bonding enhancement without requiring the separate secondary crosslinking step, thereby reducing process cost and avoiding the deterioration of crosslinking bonding property
Solution Approach 2:
The invention uses a composite approach by combining peroxide-crosslinkable binary ethylene-acrylic rubber with specific catalysts and additives. This composite material system enables the primary crosslinking to achieve both compression set improvement and crosslinking bonding enhancement simultaneously, eliminating the need for secondary crosslinking
3Reliability
If binary type AEM is used to achieve excellent compression set without secondary crosslinking, then compression set improves, but crosslinking bonding property deteriorates
Solution Approach 1:
The invention changes the crosslinking parameters by using peroxide-based primary crosslinking with specific catalysts and optimizing temperature and time conditions. This parameter optimization allows the primary crosslinking to achieve both compression set improvement and crosslinking bonding enhancement simultaneously, making the secondary crosslinking step unnecessary
Solution Approach 2:
The invention uses a composite approach by combining peroxide-crosslinkable binary ethylene-acrylic rubber with specific catalysts and additives. This composite material system enables the primary crosslinking to achieve both compression set improvement and crosslinking bonding enhancement simultaneously, eliminating the need for secondary crosslinking
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 achieves excellent compression set and crosslinking bonding without secondary crosslinking, matching traditional materials' performance while reducing production costs and improving Mooney scorch properties and physical properties.
Implementation Method 1
a binary type AEM that contains ethylene applicable with peroxide-crosslinking
Implementation Method 2
The crosslinking density of the ACM is increased by causing secondary crosslinking therein
Data Source
AI summary
An object of the present invention is to provide an ethylene-acrylic rubber composition that is excellent in the compression set and also in the crosslinking bonding even when no secondary crosslinking is caused therein, an ethylene-acrylic rubber produced by causing primary crosslinking in the composition, a rubber metal composite formed by bonding the ethylene-acrylic rubber and a metal with each other, and a bonded piston sealing including the rubber metal composite. The object is achieved by an ethylene-acrylic rubber composition including 1 to 7 PHR by weight of calcium hydroxide relative to 100 PHR by weight of a binary ethylene-acrylic rubber polymer that includes ethylene and an acrylic acid ester, an ethylene-acrylic rubber produced by causing peroxide-crosslinking by primary crosslinking in the ethylene-acrylic rubber composition, a rubber metal composite formed by crosslinking-bonding the ethylene-acrylic rubber and a metal with each other bonded with the primary crosslinking, and a bonded piston sealing including the rubber metal composite.