Dual-Cure Silicone Composition for Fast UV Cure and Strong Adhesion
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Solution Overview
Problem
Conventional thiol-ene functional organopolysiloxane compositions cure quickly but suffer from poor adhesion to substrates, leading to adhesive failure when removed, limiting their use in applications where heat exposure is undesirable.
Innovation Solution
A curable silicone composition comprising an organopolysiloxane with silicon-bonded aliphatically unsaturated groups, a mercapto-functional organopolysiloxane, a photoinitiator, and an acryloxy-functional silane, which can be cured via UV radiation and moisture, forming a cured product with excellent adhesion to substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thiol-ene functional organopolysiloxane compositions are used for UV curing, then cure speed is improved, but adhesion to substrate deteriorates
Solution Approach 1:
The patent combines thiol-ene functional organopolysiloxane (for fast UV curing) with silane-functional organopolysiloxane (for moisture curing and adhesion). This composite system allows the thiol-ene component to provide rapid initial cure while the silane component provides strong substrate adhesion through moisture-cured crosslinking, resolving the contradiction between cure speed and adhesion.
2Temperature
If UV curing is used to avoid heat exposure, then temperature control is improved, but curing effectiveness in shadow areas deteriorates
Solution Approach 1:
The patent changes the curing mechanism from purely UV-dependent to dual-mode (UV + moisture). The silane-functional component undergoes moisture-cured crosslinking that is independent of UV radiation, allowing effective curing in shadow areas while maintaining the low-temperature advantage of UV curing where light reaches.
3Reliability
If dual cure systems are implemented to improve adhesion, then adhesion to substrate is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated composition: the organopolysiloxane mixture contains both thiol-ene and silane-functional components that work together, the photoinitiator handles UV activation, and ambient moisture provides the second curing pathway. This unified approach achieves dual-curing benefits without requiring separate application steps or complex processing equipment.
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 strong adhesion to substrates, overcoming the adhesive failure issues of conventional thiol-ene functional organopolysiloxane compositions, enabling use in applications requiring UV curing without heat exposure.
Implementation Method 1
The composition can be cured via exposure to irradiation
Implementation Method 2
thiol-ene functional organopolysiloxane compositions are known to cure very quickly
Data Source
AI summary
A curable composition comprises: (A) an organopolysiloxane having an average of at least two silicon-bonded aliphatically unsaturated groups per molecule; (B) an organopolysiloxane free from aliphatically unsaturated groups and having an average of at least two mercapto groups per molecule; (C) a photoinitiator; (D) an acryloxy-functional silane; and (E) a tetraorthosilicate.