Transparent Adhesive Sheet UV Surface Activation Silane Coupling
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Solution Overview
Problem
Conventional adhesive sheets for optics face challenges in balancing adhesion and rework properties, with existing solutions failing to provide stable adhesion that passes pressurization tests while maintaining reworkability and workability, particularly for silicone-based materials which tend to quickly revert to a hydrophobic state after surface activation treatments.
Innovation Solution
A production method for a silicone-based transparent adhesive sheet that involves surface activation treatment using UV-ray irradiation of specific wavelengths, followed by the application of an activity maintaining layer, which enhances peel strength over time and maintains adhesion without hydrophobic recovery, ensuring both adhesion and rework properties are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface activation treatment is performed to enhance adhesion, then adhesion strength is improved, but hydrophobic recovery occurs quickly causing adhesion to decrease over time
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the silicone-based pressure sensitive adhesive and the substrate. The silane coupling agent forms a stable chemical bond with both the silicone adhesive and the substrate surface, preventing hydrophobic recovery and maintaining long-term adhesion strength without being affected by the natural tendency of silicone to revert to hydrophobic state
Solution Approach 2:
The chemical composition of the adhesive system is modified by adding a silane coupling agent, which changes the surface properties and chemical reactivity. This parameter change enables the adhesive to form stable chemical bonds with the substrate, preventing the hydrophobic recovery phenomenon that occurs with conventional silicone adhesives
2Strength
If high adhesion is achieved through surface activation treatment, then bonding strength is improved, but rework property deteriorates
Solution Approach 1:
By controlling the type and amount of silane coupling agent and adjusting the curing conditions, the adhesion strength can be optimized to pass pressurization tests while maintaining sufficient reworkability. The silane coupling agent provides controlled chemical bonding that strengthens the adhesive bond without completely eliminating the ability to perform repairs
3Strength
If UV-ray treatment is applied to enhance adhesion, then initial bonding is improved, but long-term adhesion stability deteriorates due to hydrophobic recovery
Solution Approach 1:
The silane coupling agent serves as a mediator that bridges the UV-treated surface and the silicone adhesive. It forms a stable chemical connection that prevents the UV treatment effects from being negated by hydrophobic recovery, thereby maintaining adhesion durability over time
Solution Approach 2:
The adhesive system is formulated as a composite containing silicone-based pressure sensitive adhesive and silane coupling agent. This composite structure combines the transparency and heat resistance of silicone with the stable bonding properties of silane, achieving both initial bonding strength and long-term adhesion stability
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 method results in a silicone-based transparent adhesive sheet with improved adhesion that increases over time, enhancing productivity and preventing peeling defects, while maintaining stable lamination quality and storage properties, thus addressing the limitations of previous technologies.
Implementation Method 1
performing surface activation treatment using irradiation of energy-rays of a specific wavelength range on to the adhesive face... by performing surface activation treatment using UV-ray irradiation
Data Source
Figure 1(a)~1(d)
Figure 2~4
Figure 5(a)~5(c)
AI summary
The present invention discloses a transparent adhesive sheet for optics, which is capable of satisfying both adhesion and rework property, in view of the above problems of prior art. A production method of a silicone-based transparent adhesive sheet for optics for assembling the optical components, characterized by forming a surface activation treated surface, in which peel strength after laminating onto an adherend increases with time, as compared with peel strength before lamination, by performing surface activation treatment using UV-ray irradiation on at least a part or the entire surface of an adhesive face contacting with the adherend of said transparent adhesive sheet for optics, and a transparent adhesive sheet for optics obtained from the production method thereof, and the like.