Reactive Interlayer for Pre-Cured Silicone Adhesion
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Solution Overview
Problem
Pre-cured silicone materials struggle to form strong chemical bonds with substrates due to the lack of chemically active groups, resulting in physical adhesion that is not strong enough, making them easily removable.
Innovation Solution
A reactive interlayer is applied to the substrate surface, which contains chemically reactive groups that interact with the pre-cured silicone material, forming a strong chemical bond and enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pre-cured silicone material is applied directly to a substrate, then the application process is simple and quick, but the adhesion strength is insufficient and the material can be easily removed
Solution Approach 1:
A silane-modified polymer interlayer is introduced between the pre-cured silicone material and the substrate. This interlayer contains silane groups that can chemically bond to both the silicone material and the substrate, creating a strong adhesive interface without requiring the silicone material itself to have chemically active groups for substrate bonding
2Strength
If chemically active groups are present on the silicone material surface, then strong chemical bonding with substrate is achieved, but the material cannot be pre-cured without moisture
Solution Approach 1:
The adhesion function is segmented from the silicone material itself and transferred to a separate silane-modified polymer interlayer. The silicone material can be pre-cured in a controlled environment without moisture since it lacks chemically active groups, while the interlayer provides the chemical bonding capability when applied to the substrate
3Ease of operation
If physical adhesion alone is used, then the material can be easily applied and removed, but the bond is not strong enough for permanent attachment
Solution Approach 1:
The adhesive system is made composite by combining the pre-cured silicone material with a silane-modified polymer interlayer. This composite structure provides both the desirable properties of the silicone material (flexibility, weather resistance) and the strong chemical bonding capability of the silane-modified polymer, achieving both ease of application and permanent attachment
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 reactive interlayer enables a significantly stronger chemical bond between the pre-cured silicone material and the substrate, preventing easy removal and ensuring cohesive failure rather than adhesive failure.
Implementation Method 1
A reactive interlayer is applied to the substrate surface, which contains chemically reactive groups that interact with the pre-cured silicone material, forming a strong chemical bond and enhancing adhesion
Implementation Method 2
Once the adhesive and the substrate surface are in proximity, molecular interactions such as van der Waals forces may contribute significantly to the ultimate bond strength
Data Source
AI summary
A method of adhering a substantially cured or fully cured silicone based material to a substrate surface is provided. The silicone based material is obtained by curing a condensation curable composition. The condensation curable composition comprises: (I) at least one condensation curable silyl terminated polymer having at least one hydrolysable and/or hydroxyl functional group(s) per molecule; (II) a cross-linker selected from the group of silanes having at least two hydrolysable groups per molecule; and/or silyl functional molecules having at least two silyl groups, each silyl group containing at least one hydrolysable group; and (III) a condensation catalyst selected from the group of titanates and zirconates. The method includes applying a reactive interlayer to the substrate surface and applying pressure to sandwich the reactive interlayer between a surface of the silicone based material and the substrate surface, thereby causing chemical bonding of the silicone based material to the substrate.