Surface-Wetting Barrier Film Primer for Humidity-Stable Adhesion
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Solution Overview
Problem
The adhesion between the phosphor layer and the barrier film in wavelength conversion sheets is poor, leading to peeling and moisture/oxygen infiltration, especially under high-temperature high-humidity conditions, which deteriorates the light-emitting properties of the phosphor layer.
Innovation Solution
A barrier film with a primer layer formed using a composition containing a resin with a reactive carbon-carbon double bond, a resin with a primary hydroxyl group, and a polyisocyanate compound, achieving a surface wetting index of 40 dyn/cm or more, which enhances adhesion and maintains it even under high-temperature high-humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier film is laminated to both surfaces of a phosphor layer, then oxygen infiltration is prevented, but adhesion between the barrier film and phosphor layer is poor causing peeling
Solution Approach 1:
An adhesion promoter layer is introduced between the barrier film and phosphor layer to mediate the bonding interface. This intermediate layer contains silane coupling agents that form chemical bonds with both the inorganic phosphor particles and the organic barrier film, resolving the adhesion problem while maintaining the oxygen barrier function.
Solution Approach 2:
The barrier film structure is transformed into a composite multi-layer system comprising the barrier film, adhesion promoter layer, and phosphor layer. This composite structure combines the oxygen barrier properties of the barrier film with the adhesion enhancement of the promoter layer, achieving both protection and bonding.
2Object-affected harmful factors
If the optical laminate is kept under high-temperature high-humidity environment, then moisture infiltration accelerates, but peeling between phosphor layer and barrier film occurs leading to performance deterioration
Solution Approach 1:
The adhesion promoter layer is applied in advance to the phosphor layer surface before lamination with the barrier film. This preliminary treatment creates a protective interface that prevents moisture from attacking the bonding interface, thereby maintaining adhesion stability under high-temperature high-humidity conditions.
Solution Approach 2:
The surface energy and chemical composition of the phosphor layer surface are modified through the adhesion promoter treatment. This parameter change enhances the wettability and chemical bonding capability at the interface, ensuring stable adhesion even when exposed to harsh environmental conditions.
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 primer layer provides superior adhesion to the phosphor layer, preventing peeling and infiltration of moisture and oxygen, thus maintaining the light-emitting properties of the phosphor layer over time.
Implementation Method 1
the composition containing a resin having a reactive carbon-carbon double bond, a resin not having a reactive carbon-carbon double bond but having a primary hydroxyl group, and a polyisocyanate compound
Implementation Method 2
the primer layer having a surface wetting index of 40 dyn/cm or more
Data Source
AI summary
Provided is a barrier film including a gas barrier film and a primer layer disposed on one outermost surface of the barrier film and made of a cured product formed by using a composition for forming a primer layer, the composition containing a resin having a reactive carbon-carbon double bond, a resin not having a reactive carbon-carbon double bond but having a primary hydroxyl group, and a polyisocyanate compound, the primer layer having a surface wetting index of 40 dyn/cm or more.