Radiation-Curable Silicone Rubber Composition for UV-LED Curing
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Solution Overview
Problem
Existing radiation-curable silicone compositions are unable to cure rapidly at low intensity, low energy radiation, making them unsuitable for use as coatings or adhesives for electrical and electronic devices.
Innovation Solution
A radiation-curable silicone rubber composition comprising an organopolysiloxane with multiple (meth)acryloyl groups at each molecular chain terminal and a radiation sensitizer, which can be cured quickly using low intensity UV-LED light, providing excellent adhesion and corrosion prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional radiation-curable silicone compositions are used, then the composition can be cured by irradiation, but the curing rate is slow when using low intensity, low energy radiation such as UV-LED
Solution Approach 1:
The patent modifies the chemical structure of the organopolysiloxane by introducing multiple (meth)acryloyl groups at each molecular chain terminal (Formula 1 structure), which changes the reactivity parameters of the system. This structural modification enables the composition to cure rapidly even under low intensity UV-LED radiation, resolving the contradiction between curing rate and radiation intensity requirements
Solution Approach 2:
The invention creates a composite curing system combining a specifically structured organopolysiloxane (Formula 1) with a photopolymerization initiator (Formula 2) and optionally a silane crosslinking agent (Formula 3). This composite material system synergistically enhances curing efficiency under low energy radiation while maintaining the desired curing rate
2Reliability
If conventional organopolysiloxane compositions are used, then the composition can form a cured coating, but the adhesion to substrates is insufficient and corrosion prevention is inadequate
Solution Approach 1:
The patent introduces specific chemical structure parameters in Formula 1, where each molecular chain terminal contains multiple (meth)acryloyl groups with specific carbon chain lengths (R1: 1-9 carbons, R2: 2-4 carbon atoms or oxygen). These parameter specifications optimize both adhesion strength and corrosion resistance by controlling molecular packing, crosslinking density, and interfacial interactions with substrates
Solution Approach 2:
The composite formulation combining organopolysiloxane (Formula 1), photopolymerization initiator (Formula 2), and optional silane crosslinking agent (Formula 3) creates a multi-functional cured coating that simultaneously achieves strong adhesion and excellent corrosion prevention. The silane component specifically enhances crosslinking and substrate bonding while the acrylic groups provide surface adhesion
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 cures rapidly and adheres well to various substrates, offering effective corrosion protection even under severe conditions, making it suitable for electrical and electronic components.
Implementation Method 1
a radiation-curable silicone rubber composition comprising an organopolysiloxane, which at each molecular chain terminal contains three silicon-containing groups that each contain a plurality of (meth)acryloyl groups, and a radiation sensitizer
Data Source
AI summary
Provided is a radiation-curable silicone rubber composition comprising: (A) a specific organopolysiloxane, which at each molecular chain terminal contains two or three silicon-containing groups that each contain a plurality of (from 2 to 9) (meth)acryloyl groups (in other words, a specific organopolysiloxane containing from 8 to 54 (meth)acryloyl groups within each molecule); and (B) a radiation sensitizer. The composition cures easily and favorably upon irradiation with low intensity, low energy radiation, and in particular upon irradiation with ultraviolet light emitted from a UV-LED light source. A cured coating generated from the composition rapidly develops favorable adhesion to a wide variety of substrates, and provides excellent corrosion prevention for the substrate, even under severe conditions.