UV-Curable Epoxy Silicone Composition for Transparent Cured Products
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Solution Overview
Problem
Existing curable silicone compositions cured by UV radiation exhibit insufficient curing and poor transparency and mechanical properties.
Innovation Solution
A curable silicone composition comprising epoxy-functional silicone resin and oligomer with specific molecular structures, combined with iodonium and sulfonium salt type cationic photoinitiators, and optionally adhesion promoters, to enhance curing and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional epoxy-functional silicone composition is cured by UV radiation, then curing is achieved, but the cured product has poor transparency and mechanical properties
Solution Approach 1:
The patent uses a composite photoinitiator system combining cationic photoinitiators (iodonium or sulfonium salts) with radical photoinitiators (benzophenone or hydroxyketone derivatives). This composite approach enables dual-curing mechanisms that achieve both complete curing and high transparency, resolving the contradiction between curability and transparency in UV-cured silicone compositions.
Solution Approach 2:
The patent optimizes the molecular structure parameters of the epoxy-functional silicone resin, specifically controlling the ratio of methyl groups to other organic groups and the distribution of siloxane units. These parameter changes improve both the curability and transparency of the cured product by enhancing UV penetration and epoxy group accessibility while maintaining mechanical properties.
2Reliability
If conventional epoxy-functional silicone composition is cured by UV radiation, then curing is achieved, but the cured product has poor mechanical properties
Solution Approach 1:
The patent employs a composite photoinitiator system that combines cationic and radical photoinitiators working synergistically. The cationic photoinitiators promote epoxy ring-opening polymerization for complete curing, while radical photoinitiators contribute to crosslinking network formation, together achieving excellent mechanical properties alongside full curability.
Solution Approach 2:
The patent introduces vinyl-functional silicone resin as a crosslinking agent that creates localized crosslinked regions within the silicone matrix. This local quality enhancement through controlled crosslinking density improves the overall mechanical strength and elasticity of the cured product while maintaining uniform curability throughout the 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 composition achieves excellent curability with UV radiation and heating, resulting in a cured product with improved transparency and mechanical properties.
Implementation Method 1
a curable silicone composition which can be cured by irradiation with ultraviolet ('UV') ray
Implementation Method 2
excellent curability with UV radiation, and further with heating
Data Source
AI summary
A curable silicone composition is provided. The composition comprises: (A) an epoxy-functional silicone resin having monovalent aromatic hydrocarbon groups; (B) an epoxy-functional silicone; and (C) a mixture of cationic photoinitiators comprising: (C-1) an iodonium salt type cationic photoinitiator and (C-2) a sulfonium salt type cationic photoinitiator. The composition has excellent curability with UV radiation, and further with heating, generally forms a cured product with excellent transparency.