Barrier Laminate Urethane Acrylate Adhesion
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Solution Overview
Problem
Barrier laminates used in infusion solution bags are prone to peeling due to interfacial peeling between organic and inorganic layers, and insufficient adhesion between the organic layer and the adhesive layer, leading to compromised barrier properties under stress and mishandling.
Innovation Solution
A barrier laminate comprising a first organic layer, an inorganic layer, and a second organic layer, where the second organic layer is formed by curing a polymerizable composition with a urethane acrylate polymer, which includes an acrylic main chain and a side chain with an acryloyl group, enhancing adhesion and hardness, and is applied directly to the inorganic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier laminate with organic and inorganic layers is used to achieve high barrier properties, then water vapor and oxygen blocking performance is improved, but interfacial peeling occurs between layers under stress and mishandling
Solution Approach 1:
The patent applies composite materials by creating a multi-layer structure consisting of a substrate, first organic layer, inorganic layer, and second organic layer. Each layer is specifically designed to contribute different properties: the organic layers provide adhesion and flexibility while the inorganic layer provides barrier properties, collectively solving the contradiction between barrier performance and interfacial strength
Solution Approach 2:
The patent applies local quality by differentiating the properties of different layers: the first organic layer has higher Tg for thermal stability, the inorganic layer provides gas barrier, and the second organic layer has lower Tg and specific molecular weight for adhesion. This localized optimization of material properties at different positions resolves the contradiction between maintaining barrier integrity and preventing interfacial peeling
2Reliability
If the organic layer is made harder to improve barrier properties, then oxygen and water vapor blocking is improved, but adhesion between organic layer and adhesive layer deteriorates
Solution Approach 1:
The patent applies local quality by assigning different glass transition temperatures to different organic layers: the first organic layer has Tg of 50°C or higher for thermal stability and barrier performance, while the second organic layer has Tg of -50°C to 50°C for flexibility and adhesion. This differentiated approach allows each layer to optimize its local properties for its specific function
Solution Approach 2:
The patent uses composite materials by combining organic layers with different molecular weights and Tg values. The second organic layer specifically uses polymerizable composition with weight average molecular weight of 1,000 to 100,000 to achieve optimal balance between adhesion to the adhesive layer and maintaining barrier integrity
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 solution provides a barrier laminate that is resistant to peeling and maintains satisfactory barrier properties even under impact and stress, ensuring the integrity of the infusion solution bag.
Implementation Method 1
the second organic layer is formed by curing a polymerizable composition which is directly applied to a surface of the inorganic layer
Data Source
Figure 1
AI summary
Provided are a barrier laminate, a gas barrier film including the barrier laminate and a substrate film, a laminated film including the gas barrier film, an adhesive layer and a sealant film, and an infusion solution bag including the laminated film. The barrier laminate includes a first organic layer, an inorganic layer, and a second organic layer in this order, in which the second organic layer is formed by curing a polymerizable composition which is directly applied to a surface of the inorganic layer, the polymerizable composition includes a urethane acrylate polymer, the urethane acrylate polymer has a structure which includes an acrylic main chain and a side chain including a urethane polymer unit or a urethane oligomer unit, and the side chain has an acryloyl group at a terminal.