Silicone-Coated Fluororubber-Metal Laminate for Anti-Bonding Seals
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Solution Overview
Problem
Current fluorinated-rubber-metal laminates for gaskets face issues with bonding to housing materials under high-temperature and high-pressure conditions, leading to premature thin film breakage and strong adhesion, which compromises their durability and sealing effectiveness.
Innovation Solution
A fluorinated-rubber-metal laminate is developed with a surface-coating layer containing a silicone emulsion cured at 10 mass % or more, along with a bloom component, applied on both surfaces of a metal sheet, which inhibits bonding to the housing material by deactivating active double bonds and enhancing the thin film's durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fluorinated rubber layer is used for high-temperature sealing, then heat resistance is improved, but active double bonds form that cause strong bonding to housing material
Solution Approach 1:
A surface-coating layer is introduced as an intermediary between the fluorinated rubber layer and the housing material. This coating layer contains a silicone emulsion that reacts with active double bonds in the fluorinated rubber, forming a modified surface that prevents direct bonding to the housing material while maintaining the sealing function.
2Object-generated harmful factors
If a surface-coating agent is applied to prevent bonding, then bonding prevention is improved, but the thin film breaks under high-temperature and high-pressure conditions
Solution Approach 1:
The surface-coating agent's composition is modified by incorporating a silicone emulsion with specific properties (10-50 mass% content). The coating is applied at controlled thickness (1-10 μm) and cured under specific temperature conditions (100-200°C for 1-24 hours), optimizing the balance between bonding prevention and film durability under high-temperature and high-pressure conditions.
3Ease of operation
If the surface-coating layer is made thinner to maintain flexibility, then flexibility is improved, but bonding prevention effectiveness decreases
Solution Approach 1:
The optimal thickness range of 1-10 μm is determined to balance flexibility and bonding prevention. Within this range, the coating is thin enough to maintain the laminate's flexibility and conformability, yet thick enough to provide sufficient barrier function against bonding to the housing material.
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 effectively reduces bonding force to the housing material, ensuring the laminate's durability and preventing premature breakage, thus maintaining its sealing performance even under harsh conditions.
Implementation Method 1
the active double bond still remains in the fluorinated rubber. Since the fluorinated rubber material is typically used as a sealing material for a cylinder head gasket, and the like, operation is made in a sandwiched state by housing materials. Thus, in the fluorinated rubber material, the active double bond causes a bonding reaction between the fluorinated rubber material and the housing material
Implementation Method 2
the surface-coating layer is a cured film obtained by curing of a coating film of a surface-coating agent containing a silicone emulsion
Data Source
AI summary
A rubber-metal laminate includes: a metal sheet; a fluorinated rubber layer laminated on one surface or both surfaces of the metal sheet; and a surface-coating layer with which the fluorinated rubber layer is coated, wherein the surface-coating layer is a cured film obtained by curing of a coating film of a surface-coating agent containing a silicone emulsion, and the silicone emulsion is contained at 10 mass % or more in the surface-coating agent.