Silane-Nitroso Bonding Composition for Durable Rubber-to-Glass Joints
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Solution Overview
Problem
Current adhesive technologies for bonding polymers to hydroxylated surfaces, such as glass, face challenges in achieving strong and durable bonds, especially under flexing stress and varying process conditions, and often require complex multi-step processes with potential for sedimentation and reduced durability.
Innovation Solution
A method involving the application of a compound containing alkoxy silane moieties and aromatic nitroso or aromatic nitroso precursors to the polymer and hydroxylated surface, which can be heated to enhance bond formation, allowing for a single-step adhesive system that forms strong and durable bonds without the need for vulcanization of the rubber prior to bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional two-step bonding systems (primer + adhesive) are used for rubber to glass bonding, then bond strength can be achieved, but the process complexity increases and manufacturing efficiency decreases
Solution Approach 1:
The patent combines the primer and adhesive functions into a single compound containing both silane coupling agent moieties and isocyanate groups. This unified bonding agent performs both surface priming and adhesive bonding in one step, eliminating the need for separate primer application and reducing process complexity while maintaining bond strength.
Solution Approach 2:
The bonding compound is designed with multi-functionality, containing silane groups for surface coupling, isocyanate groups for rubber crosslinking, and catalyst systems for controlled curing. This single compound performs multiple functions that traditionally required separate materials, simplifying the bonding process while ensuring consistent performance across different elastomers and substrates.
2Reliability
If conventional adhesive systems are used, then bonding can be achieved, but consistency across various elastomer types and substrates is poor
Solution Approach 1:
The patent employs a catalyst system that allows controlled activation of the isocyanate groups at specific temperatures and conditions. By adjusting curing parameters such as temperature and catalyst concentration, the bonding agent can be optimized for different elastomer types and substrate materials, ensuring consistent bonding performance across diverse applications.
Solution Approach 2:
The bonding compound is formulated as a composite system containing silane coupling agents, isocyanate crosslinkers, catalysts, and optional extenders. This composite structure provides versatility in adapting to different elastomers and substrates while maintaining reliable bonding consistency through the synergistic interaction of its components.
3Strength
If multi-step bonding processes are employed, then adequate bonding can be achieved, but production time and manufacturing cost increase
Solution Approach 1:
The silane coupling agent portions of the bonding compound can be applied to the substrate in advance and allowed to react with surface hydroxyl groups before the actual bonding operation. This preliminary surface treatment ensures optimal surface preparation without requiring a separate primer step, reducing manufacturing time while maintaining bond strength.
Solution Approach 2:
The bonding process is designed to continue seamlessly from surface treatment through adhesive application to curing in a single continuous operation. The single-compound system eliminates idle time between primer drying and adhesive application, maintaining continuous productive action throughout the bonding process.
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
This approach results in a one-part adhesive system that provides excellent bond strengths, hot water and solvent resistance, and can be applied in a single step, reducing toxicity and process complexity while ensuring consistent bonding across different elastomers and substrates.
Implementation Method 1
at least one alkoxy silane moiety
Implementation Method 2
at least one alkoxy silane moiety
Implementation Method 3
at least one moiety selected from an aromatic nitroso or an aromatic nitroso precursor
Implementation Method 4
heating subsequent to bringing the substrates together
Data Source
AI summary
Methods for bonding polymeric substrates to hydroxylated surfaces such as glass are disclosed. The polymeric substrates may be elastomeric substrates such as a natural or synthetic rubber. The method may comprise applying a compound comprising at least one alkoxy silane moiety and at least one moiety selected from a nitrosoaromatic or a nitrosoaromatic precursor to one of the substrates. The nitrosoaromatic moiety may be a nitrosobenzene. The nitrosoaromatic precursor may be a nitrosobenzene precursor, such as at least one of a quinone dioxime or a quinone oxime. Novel primers and compounds suitable for use in the bonding process are also disclosed.