UV-Cured Silicone Primer Adhesion via Catalyst Integration
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Solution Overview
Problem
UV-cured silicone rubber compositions face inadequate adhesion to substrates, limiting their industrial application due to the inefficacy of existing primer compositions, which often require additional thermal curing steps, thereby negating the time and cost benefits of UV-curing.
Innovation Solution
Incorporating a UV-sensitive crosslinking catalyst into the silicone primer composition before, during, or after hardening, allowing for excellent adhesion of UV-cured silicone rubber to substrates without the need for an additional thermal curing step, using compounds such as platinum or palladium catalysts to initiate and promote crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing primer compositions are used with UV-cured silicone rubber, then the adhesion to substrate is insufficient, but adding additional thermal curing step increases production time and cost
Solution Approach 1:
The patent combines the primer composition and crosslinking catalyst into a single integrated formulation. The primer contains both the adhesion-promoting compounds and the UV-sensitive crosslinking catalyst, allowing simultaneous achievement of strong substrate adhesion and complete curing through UV irradiation alone, eliminating the need for separate thermal curing steps
Solution Approach 2:
The patent changes the chemical parameters of the primer composition by incorporating UV-sensitive crosslinking catalysts (such as platinum or palladium catalysts). This modification enables the primer to undergo UV-induced crosslinking, transforming it from a conventional thermal-cure primer to a UV-curable primer that provides both adhesion and curing in one step
2Reliability
If existing primer compositions are used with UV-cured silicone rubber, then the adhesion to substrate is insufficient, but developing new primer compositions increases complexity
Solution Approach 1:
The patent creates a universal primer composition that serves multiple functions: it provides substrate adhesion through conventional primer mechanisms and simultaneously enables UV-curing through incorporated crosslinking catalysts. This multi-functional primer works with various UV-cured silicone rubber compositions and different substrates, reducing the need for multiple specialized primer formulations
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 ensures strong and reliable adhesion of UV-cured silicone rubber to various substrates, including metals, ceramics, and glass, without requiring thermal curing, thereby enhancing productivity and enabling broader industrial use of UV-cured silicones in electrical applications.
Implementation Method 1
at least one UV-sensitive crosslinking catalyst selected from compounds which initiate and promote curing, resp. crosslinking, of UV-curable silicone rubber compositions
Implementation Method 2
a tight and strong adhesion is obtained between the cured silicone rubber and the substrate surface
Data Source
AI summary
Method of producing a layer of a UV-cured silicone rubber composition on a substrate surface, comprising applying a primer composition to the substrate surface and hardening said primer composition followed by applying a UV-curable silicone rubber composition, and UV-curing said curable silicone rubber composition, characterized in that at least one UV-sensitive crosslinking catalyst selected from compounds which initiate and promote curing of UV-curable silicone rubber compositions is added to the silicone primer composition in any desired sequence before, during or after hardening of said silicone primer composition.