UV-Curable Silicone Compositions with Organophosphorus Stabilizers
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Solution Overview
Problem
One-component thermally crosslinkable silicone compositions require high storage stability and long pot life, which is achieved using platinum catalysts or inhibitors, but these methods impair crosslinking rate and necessitate high temperatures or long curing times, while UV-crosslinking compositions face storage instability and rapid gelation.
Innovation Solution
Silicone compositions crosslinked by UV light, comprising organosilicon compounds with Si—C bonds, hydrogenated Si compounds, platinum catalysts activated by UV light, and organophosphorus compounds, specifically organophosphorus compounds of certain formulae, that maintain stability and enable rapid curing at room temperature without impairing crosslinking rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If one-component thermal crosslinking systems use high storage stability formulations with platinum catalysts or inhibitors, then long pot life and storage stability are achieved, but crosslinking rate is impaired and high temperatures or long curing times are required
Solution Approach 1:
The patent changes the activation parameter from thermal to photonic (UV light). By using a photoinitiated crosslinking system with specific photoinitiators and UV-curable silane compounds, the invention achieves rapid crosslinking at room temperature without thermal inhibition, resolving the contradiction between storage stability and crosslinking rate through a complete mechanism change rather than parameter adjustment within the thermal system.
Solution Approach 2:
The patent replaces the thermal crosslinking mechanism with a photoinitiated crosslinking mechanism. Instead of using heat-activated catalysts and inhibitors, the invention employs UV light-activated photoinitiators that generate radicals to initiate crosslinking, substituting the thermal-mechanical system with an optical-chemical system that achieves both storage stability and rapid curing.
2Productivity
If thermal crosslinking is performed at high temperatures, then crosslinking rate is improved, but energy consumption increases and temperature-sensitive materials are damaged
Solution Approach 1:
The patent replaces thermal energy input with photonic energy input from UV light sources. The photoinitiated crosslinking mechanism uses UV photons to activate photoinitiators, which then generate radicals for crosslinking at room temperature, eliminating the need for high-temperature ovens and associated energy consumption while protecting temperature-sensitive substrates.
Solution Approach 2:
The patent changes the energy input parameter from thermal (high temperature) to photonic (UV light wavelength). This parameter change enables crosslinking to proceed at ambient temperature through photochemical reactions, dramatically reducing energy consumption and eliminating thermal damage to sensitive materials while maintaining high crosslinking rate.
3Productivity
If UV light-induced crosslinking is used, then rapid curing at room temperature is achieved, but storage instability and rapid gelation occur during storage
Solution Approach 1:
The patent separates the crosslinking function into two distinct components: a stable base composition that remains inert during storage, and a UV light source that activates crosslinking only when needed. The photoinitiator and crosslinkable groups are incorporated into the silicone composition in a dormant state that does not undergo spontaneous reaction, extracting the instability problem by requiring external photonic activation to initiate the crosslinking process.
Solution Approach 2:
The patent incorporates stabilizers and uses specific photoinitiator systems that prevent premature crosslinking during storage. The formulation includes components that actively counteract any tendency toward spontaneous gelation, such as radical scavengers or stability-enhancing additives that neutralize potential initiating species until UV irradiation provides the energy to overcome the stabilization barrier.
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 silicone compositions achieve good storage life as one-component systems with rapid UV-induced curing at room temperature, maintaining crosslinking rate and stability, suitable for temperature-sensitive substrates in industries like electrical and medical technology.
Implementation Method 1
crosslinking is induced by exposure to UV light
Implementation Method 2
platinum catalysts that can be activated by light of wavelength 200 to 500 nm, preferably UV light of wavelength 200 to 400 nm
Implementation Method 3
crosslinking rate remains largely unimpaired
Data Source
AI summary
Irradiation curable addition crosslinkable organosilicon compositions employ a cyclopentadienyl platinum photocatalyst, and are rendered storage stable by incorporation of selected organophosphorus compounds, while cure is substantially unaffected.