Silicone-Polyurethane Multilayer Bonding for High-Temperature Adhesion
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Solution Overview
Problem
The challenge lies in creating a bonded multilayer article with a silicone-containing rubber substrate that effectively adheres to a polyurethane layer, particularly for high-temperature and high-pressure applications such as subsea oil drilling, where existing surface treatments fail to provide sufficient bond strength, thermal stability, and abrasion resistance.
Innovation Solution
A process involving a flame treatment of the silicone rubber substrate to increase its surface energy and adhesion to a glass syntactic polyurethane layer, forming a multilayer article with enhanced thermal stability, adhesion, and abrasion resistance, using high consistency silicone rubber as the inner layer and glass syntactic polyurethane as the outer layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silicone rubber substrate is used, then thermal stability is improved, but adhesion to polyurethane layer deteriorates
Solution Approach 1:
The patent applies flame treatment to the silicone rubber substrate surface, which changes the surface parameters by introducing polar groups and increasing surface energy. This allows the silicone rubber to maintain its bulk thermal stability while achieving improved adhesion to the polyurethane layer through the modified surface characteristics
Solution Approach 2:
The patent creates a composite structure where the silicone rubber substrate is bonded to a polyurethane layer containing reactive silane groups. The silane-modified polyurethane forms chemical bonds with the flame-treated silicone surface, creating a composite material system that combines the thermal stability of silicone with the adhesion properties of silane-crosslinked polyurethane
2Strength
If flame treatment is applied to silicone rubber surface, then adhesion is improved, but manufacturing complexity increases
Solution Approach 1:
The flame treatment is applied to the silicone rubber substrate before bonding the polyurethane layer, preparing the surface in advance to receive the adhesive. This preliminary action ensures optimal adhesion conditions are established before the bonding process begins
Solution Approach 2:
The flame treatment acts as an intermediary process that modifies the silicone surface to be more receptive to the silane-modified polyurethane. The treatment creates a surface layer with enhanced chemical reactivity that facilitates the bonding interface without requiring complex multi-step processes
3Ease of manufacture
If minimum thickness requirement is reduced, then manufacturing cost decreases, but structural integrity deteriorates
Solution Approach 1:
The silane-modified polyurethane layer forms a chemically bonded composite structure with the flame-treated silicone substrate. This composite interface provides enhanced structural integrity at the bonding layer, allowing the overall coating thickness to be reduced while maintaining strength through the chemical crosslinking at the interface
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 a strong bond between the silicone and polyurethane layers, providing improved thermal stability, increased adhesion, reduced thermal conductivity, and increased abrasion resistance, making it suitable for high-temperature and high-pressure environments like subsea oil drilling operations.
Implementation Method 1
The first layer has at least a portion of the surface of the first layer activated by a flame treatment for bonding the first layer to the second layer and for increasing the bond strength of the first layer to the second layer
Data Source
AI summary
A bonded multilayer article including: (a) at least one first layer of a silicone-containing rubber substrate material bonded to (b) at least one second layer of a substrate material bondable to the first layer; wherein at least a portion of the surface of the first layer is activated for adhesion to increase the bond strength of the first layer to a second layer such that the bond strength of the first layer bonded to the second layer is increased; and a process for producing the above bonded multilayer article.