UV Curable Adhesive Composition Hybrid System for Electronic Bonding
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Solution Overview
Problem
Existing UV curable adhesive tapes for electronic applications fail to simultaneously achieve good peel strength, overlap shear strength, and impact resistance, leading to instability and reduced service life of electronic products.
Innovation Solution
A UV curable adhesive composition comprising 20-72 parts of reactive polyacrylate, 15-63 parts of epoxy resin, 0.5-21 parts of core-shell rubber particles with a polybutadiene core, 1.4-15 parts of hydroxy-containing compounds, and an effective amount of cationic photoinitiator, which upon UV curing, provides a hybrid system with enhanced bonding performance and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If existing UV curable adhesive tapes are used to achieve good peel strength, then peel strength is improved, but overlap shear strength deteriorates
Solution Approach 1:
The patent uses a composite adhesive system combining reactive polyacrylate and epoxy resin in specific ratios (20-72 parts polyacrylate, 15-63 parts epoxy resin). This composite formulation allows the adhesive to achieve both good peel strength (through polyacrylate's adhesive properties) and overlap shear strength (through epoxy resin's structural strength), resolving the contradiction between these two strength parameters.
Solution Approach 2:
The patent optimizes the compositional parameters of the adhesive, specifically the weight ratios of reactive polyacrylate (20-72 parts) and epoxy resin (15-63 parts), along with the content of core-shell rubber particles (0.5-21 parts). By adjusting these parameters within specified ranges, the adhesive achieves simultaneous improvement in both peel strength and overlap shear strength.
2Strength
If existing UV curable adhesive tapes are used to achieve good overlap shear strength, then overlap shear strength is improved, but impact resistance deteriorates
Solution Approach 1:
The patent incorporates core-shell rubber particles (0.5-21 parts) into the epoxy-polyacrylate composite system. The rubber particles act as toughening agents that absorb impact energy through deformation, thereby improving impact resistance while maintaining the overlap shear strength provided by the epoxy resin matrix.
Solution Approach 2:
The core-shell rubber particles serve as pre-positioned cushioning elements within the adhesive structure. When impact occurs, these rubber particles deform and absorb energy, providing beforehand cushioning that prevents sudden failure and improves impact resistance without compromising the bonded strength.
3Force
If existing UV curable adhesive tapes are used to achieve good peel strength, then peel strength is improved, but impact resistance deteriorates
Solution Approach 1:
The patent creates a ternary composite system combining reactive polyacrylate, epoxy resin, and core-shell rubber particles. The polyacrylate provides adhesive bonding and peel strength, the epoxy resin provides structural integrity, and the rubber particles provide impact resistance through energy absorption, thereby resolving the contradiction between peel strength and impact resistance.
Solution Approach 2:
The patent specifies optimized parameter ranges for the composite system: 20-72 parts reactive polyacrylate, 15-63 parts epoxy resin, and 0.5-21 parts core-shell rubber particles. Within these ranges, the adhesive achieves simultaneous optimization of peel strength and impact resistance through balanced composition design.
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 achieves both good peel strength and overlap shear strength, along with improved impact resistance, ensuring the stability and extended service life of electronic products.
Implementation Method 1
UV curable adhesive composition... an effective amount of a cationic photoinitiator... upon UV curing
Data Source
AI summary
Disclosed are a UV curable adhesive composition, an adhesive tape comprising the UV curable adhesive composition, an adhesive film formed by UV curing of the adhesive composition, and a corresponding bonding member. The UV curable adhesive composition and the adhesive tape comprising the UV curable adhesive composition have a hybrid system of reactive polyacrylate/epoxy resin/core-shell rubber particles/hydroxy-containing compound, wherein a cationic photoinitiator is used to initiate curing of the epoxy resin.