Moisture-Curable Urethane Adhesive for Drop-Impact Bonding
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Solution Overview
Problem
Conventional moisture-curable polyurethane-based adhesive compositions lack sufficient impact resistance, leading to potential detachment of device components when electronic devices are dropped.
Innovation Solution
A moisture-curable urethane resin with a polytrimethylene glycol skeleton is combined with a polyfunctional isocyanate to form an adhesive composition, which includes a radical polymerizable compound and a photopolymerization initiator, optimizing molecular weights and ratios to enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional moisture-curable polyurethane-based adhesive compositions are used, then the adhesive can be automatically produced and bonded, but the impact resistance is insufficient causing components to detach when devices are dropped
Solution Approach 1:
The patent creates a composite adhesive system by blending moisture-curable polyurethane resin with epoxy resin and curating agents. This composite formulation combines the flexibility and automatic curing properties of polyurethane with the high strength and impact resistance of epoxy, resolving the contradiction between reliability under impact and bonding strength
Solution Approach 2:
The patent optimizes specific parameters including the ratio of polyol to isocyanate (NCO/OH ratio between 0.8-1.2), molecular weight of polyurethane resin (2000-10000), and curing agent content (5-20 parts by mass per 100 parts resin). These parameter adjustments transform the adhesive properties to achieve both high impact resistance and bonding strength simultaneously
2Reliability
If a polyol compound with polytrimethylene glycol skeleton is used as the main component, then the impact resistance is significantly enhanced, but the formulation complexity increases
Solution Approach 1:
The patent introduces polyol compounds with polytrimethylene glycol skeleton specifically as the main polyol component (60-95 parts by mass per 100 parts total polyol). This localized application of the special polyol structure to the core resin formulation achieves impact resistance enhancement without unnecessarily complicating the entire adhesive system
Solution Approach 2:
The patent specifies precise parameter ranges for the polytrimethylene glycol-based polyol including molecular weight (1000-5000) and content ratio (60-95%). By controlling these parameters within optimal ranges, the formulation achieves high impact resistance while maintaining manageable complexity through standardized specifications
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 significantly improves impact resistance, ensuring robust bonding and preventing component detachment in electronic devices.
Implementation Method 1
a radical polymerizable compound and a photopolymerization initiator
Implementation Method 2
moisture-curable urethane resin (A) that is a reaction product of a polyol (a1) having a polytrimethylene glycol skeleton and a polyfunctional isocyanate (a2)
Data Source
Figure 1(a)~2
AI summary
An adhesive composition, comprising a moisture-curable urethane resin (A) that is a reaction product of a polyol (a1) having a polytrimethylene glycol skeleton and a polyfunctional isocyanate (a2).