Curable Compound with Dual Light and Moisture Curing Mechanism
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Solution Overview
Problem
The existing curable compositions that rely solely on moisture for curing reactions are insufficient, as they do not effectively cure the film not exposed to light, leading to incomplete curing of the film.
Innovation Solution
A curable compound represented by a specific general formula, incorporating a branched polyolefin structure with isocyanate and (meth)acrylate groups, which can be cured by both light and moisture, ensuring thorough polymerization and bonding across the entire film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable composition uses only moisture-based curing reaction in the low molecular isocyanate compound, then the curing reaction can proceed without light irradiation, but the curing reaction does not proceed between the low molecular isocyanate compound and the curable compound, resulting in insufficient curing of the cured film
Solution Approach 1:
The patent merges two curing mechanisms (light-based photopolymerization and moisture-based polyurea formation) into a single curable compound molecule. The curable compound contains both (meth)acryloyl groups for light-induced polymerization and isocyanate groups for moisture-induced reaction, allowing both curing pathways to operate simultaneously and synergistically within the same material system.
Solution Approach 2:
The curable compound is designed with multi-functionality, serving dual roles as both a photopolymerizable monomer and a moisture-curable isocyanate compound. This single compound performs multiple functions: it can undergo radical polymerization upon light irradiation and simultaneously react with moisture to form polyurea crosslinks, eliminating the need for separate curing agents or systems.
2Reliability
If the curable composition relies solely on light irradiation for curing, then the curing reaction is fast and controllable, but portions of the film not exposed to light remain insufficiently cured
Solution Approach 1:
The curable compound is pre-designed with both photopolymerizable and moisture-reactive functional groups integrated into its molecular structure. This preliminary design ensures that when the composition is applied, both curing mechanisms are already in place and can be activated by their respective triggers (light and moisture) without requiring additional components or steps.
3Reliability
If the curable compound contains both (meth)acryloyl groups and isocyanate groups, then comprehensive curing by both light and moisture is achieved, but the molecular structure becomes more complex
Solution Approach 1:
The curable compound represents a composite molecular structure that integrates functionalities typically found in separate materials. By combining photopolymerizable (meth)acryloyl groups and moisture-reactive isocyanate groups within a single molecular framework, the patent creates a hybrid material that exhibits properties of both photopolymers and polyurea systems.
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 curable compound achieves comprehensive curing by light and moisture, enhancing the mechanical and weather-resistant properties of the cured film, as demonstrated by increased volume resistivity and breakdown voltage.
Implementation Method 1
a (meth)acryloyl group polymerized by being irradiated with ultraviolet rays
Implementation Method 2
the isocyanate groups of the low molecular isocyanate compound react with each other by moisture in air to allow polymerization to proceed
Data Source
AI summary
Provided is a curable composition including a urethanization reaction product of a branched polyolefin diol; at least one selected from an isocyanurate product, an adduct product, and a biuret product, of an aliphatic diisocyanate having 6 to 10 total carbon atoms; and a hydroxy saturated C1 to C4 alkyl (meth)acrylate. Also provided are a method for producing the curable composition, and a specific curable compound included in the curable composition.