Dually Curable Adhesive Composition for Compressible Non-UV Bonding
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Solution Overview
Problem
Existing dually curable adhesives lack sufficient compressibility after UV irradiation, limiting workability and bonding strength when used with non-UV transparent substrates.
Innovation Solution
A dually curable adhesive composition comprising isocyanate-terminated polyurethane prepolymer, radical polymerizable compound, photoinitiator, and moisture curing catalyst, with a loss factor value greater than 0.6 after UV radiation, ensuring fast curing and enhanced mechanical properties during moisture curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If UV irradiation is applied to cure the adhesive, then fast curing speed is achieved, but the adhesive loses compressibility and becomes difficult to laminate
Solution Approach 1:
The patent applies preliminary UV irradiation to initiate partial curing of the adhesive before lamination, creating a semi-cured state with optimized compressibility. This preliminary action allows the adhesive to maintain sufficient workability during assembly while achieving fast initial curing, resolving the contradiction between curing speed and compressibility by controlling the degree of curing at different stages
Solution Approach 2:
The patent employs a dual-curing mechanism where the adhesive transitions from a fully uncured state through a semi-cured UV-initiated state to a fully cured moisture-completed state. This dynamic curing progression allows the adhesive to exhibit different mechanical properties at different stages: sufficient compressibility during semi-cured lamination and high strength in the final cured state, thereby resolving the static contradiction between compressibility and curing speed
2Strength
If conventional dually curable adhesive is used, then bonding capability is achieved, but compressibility after UV irradiation is insufficient
Solution Approach 1:
The patent modifies the adhesive composition by incorporating specific components including a silane-modified polyurethane prepolymer, silane crosslinking agent, and catalyst system that work together to achieve both high bonding strength and adequate compressibility after UV irradiation. The parameter changes in composition enable the adhesive to maintain optimal mechanical properties during the semi-cured state while achieving superior bonding strength in the final cured state
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 adhesive composition exhibits remarkable compressibility and high cross tensile strength, allowing for efficient bonding of non-UV transparent substrates with fast curing speed and improved workability.
Implementation Method 1
UV curable composition and moisture curable composition
Implementation Method 2
moisture curable composition
Implementation Method 3
cross tensile strength
Data Source
AI summary
The present invention provides a dually curable adhesive composition comprising (A) at least one isocyanate-terminated polyurethane prepolymer, (B) at least one radical polymerizable compound, (C) at least one photoinitiator, and (D) at least one moisture curing catalyst, wherein the composition after UV radiation with a wavelength of 375 nm and intensity of 50 mW/cm2 for 60 seconds, has a loss factor value larger than 0.6, as measured at room temperature in accordance with ASTM D4440-15.