UV-Curable Sealing Material for Self-Adhesive Waterproof Lamination
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Solution Overview
Problem
Conventional sealing materials for electronic and precision components lack sufficient heat resistance, water-proof properties, and require cumbersome processes, including the use of molds and heating apparatuses, which complicates their application and production.
Innovation Solution
A photocurable sealing material comprising a polythiol compound, which exhibits excellent self-adhesiveness and air-tightness when laminated and cured with ultraviolet rays, allowing for the production of sheets with high self-adhesion strength and water-proof properties without the need for molds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing materials (hot-melt adhesive agents, moisture-curable hot-melt sealing materials, heat-curable sealing materials) are used, then sealing properties are provided, but heat resistance is insufficient and cumbersome workability is required due to prevention of moisture inclusion or use of heating apparatuses and molds
Solution Approach 1:
The patent replaces thermal curing mechanisms (heat-curable sealing materials requiring heating apparatuses) and moisture-curing mechanisms (requiring prevention of moisture inclusion) with a photocurable mechanism using ultraviolet rays. This substitution eliminates the need for complex heating equipment and moisture control measures, significantly improving workability while maintaining sealing properties
Solution Approach 2:
The patent extracts and eliminates the problematic elements from conventional sealing materials: no heating apparatuses are needed, no moisture inclusion prevention is required, and no molds are necessary. The photocurable sealing material achieves curing through direct UV irradiation, removing all cumbersome workability requirements while maintaining reliable sealing
2Reliability
If conventional sealing materials are used, then sealing properties are provided, but heat resistance is insufficient
Solution Approach 1:
The patent changes the fundamental curing parameter from thermal energy (heat) to photonic energy (ultraviolet light). This parameter change enables heat resistance because the cured sealing material is not subjected to high temperatures during curing, and the resulting polymer structure exhibits superior thermal stability compared to conventionally cured sealing materials
3Ease of operation
If photocurable sealing materials using radical polymerization of acryloyl group are used, then workability is improved without molds, but sealing properties are insufficient because water penetrates from small gaps
Solution Approach 1:
The patent employs a composite formulation combining polyol compounds with specific molecular weights (100-10000), polyisocyanates, and photocurable compounds. This composite material approach creates a sealing material that simultaneously achieves excellent adhesion (filling small gaps), flexibility, and superior water-proof properties through the synergistic effects of the different components
Solution Approach 2:
The patent optimizes the molecular weight distribution of polyol compounds (100-10000 range) to create different local properties within the sealing material: lower molecular weight components provide adhesion and gap-filling capability, while higher molecular weight components provide flexibility and water-proofing. This local quality differentiation ensures both workability and superior sealing performance
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 photocurable sealing material provides enhanced air-tightness and water-proof properties, simplifying the production process and improving workability, while maintaining stability and flexibility.
Implementation Method 1
the photocured sheets are laminated... when the sheets are pulled... the self-adhesion strength in a T-type peel test is 5 N/25 mm or more
Data Source
AI summary
A photocurable sealing material comprising at least a polythiol compound as a first component, wherein, in the case where the photocurable sealing material is used to produce two sheets having a thickness of 1 mm, a width of 25 mm, and a length of 200 mm, the two sheets are photocured by irradiation with an ultraviolet ray, then the photocured sheets are laminated, and the laminate is subjected to a load of 10 kg for 10 seconds, an action of causing the lamination interface between the two sheets to disappear is exhibited, and the self-adhesion strength in a T-type peel test is 5 N/25 mm or more when the sheets are pulled at a peel speed of 300 mm/min.