UV Curable Resin Composition for Low Thermal Resistance Adherends
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Solution Overview
Problem
Existing UV curable compositions face challenges in achieving sufficient adhesiveness without the need for high-temperature heating processes, particularly when applied to adherends with low thermal resistance.
Innovation Solution
A UV curable resin composition is developed that combines a solid rubber component and a liquid rubber component with a diene skeleton, along with a photopolymerization initiator, a crosslinker, and a tackifier, to enhance adhesiveness and mechanical strength without requiring heat curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic peroxide is used as a thermal radical initiator for curing, then the adhesive composition achieves good adhering force and prevents warping and wrinkling, but the thermal curing process requires about 180°C heating which is not suitable for adherends with low thermal resistance
Solution Approach 1:
The invention changes the curing mechanism from thermal to photopolymerization, fundamentally altering the temperature parameter required for curing. By using a photopolymerization initiator instead of thermal initiator, the curing process occurs at room temperature under UV irradiation, eliminating the 180°C heating requirement while maintaining good adhering force and preventing warping and wrinkling through the rubber component formulation.
Solution Approach 2:
The invention replaces the thermal curing mechanism with a photopolymerization mechanism. Instead of using heat (thermal energy) to initiate and sustain the curing reaction, the patent uses UV light (electromagnetic energy) to activate the photopolymerization initiator, thereby substituting a thermal process with a photochemical process that occurs at ambient temperature.
2Temperature
If UV irradiation is used for low-temperature curing, then the curing process can be applied to adherends with low heat resistance, but the cross-linked rubber obtained cannot be sufficiently bonded with the adherends
Solution Approach 1:
The invention creates a composite adhesive system combining cross-linked rubber with specific functional components. The rubber component containing unsaturated bonds forms a cross-linked network structure through UV photopolymerization, while the combination of rubber elasticity and cross-linked structure provides both flexibility for low-temperature curing and sufficient bonding strength to adherends, resolving the contradiction between low curing temperature and adhesion performance.
3Object-affected harmful factors
If plasticizers are used to soften the adhesive material layer, then the bonding interface stress is alleviated and material damage is prevented, but internal stress accumulates in the adhesive material layer or bonding interface when the deformed material is restored
Solution Approach 1:
The invention changes the fundamental mechanism of stress relief from plastic deformation to elastic deformation through cross-linking. Instead of using plasticizers that cause permanent deformation and subsequent internal stress, the cross-linked rubber network provides reversible elastic deformation that alleviates bonding interface stress without accumulating internal stress, maintaining cohesive force and reliability.
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 composition achieves excellent adhesiveness and mechanical strength, allowing for the creation of uniform, thin sheets that can be used as adhesive or stretchable sheets, even on adherends with low thermal resistance.
Implementation Method 1
a UV curable resin composition comprising a rubber component with a diene skeleton, a photopolymerization initiator, a crosslinker, and a tackifier
Data Source
AI summary
The present invention provides a UV curable resin composition that can be cured without going through a high-temperature heating process and has excellent adhesiveness, and a sheet using the same.The UV curable resin composition comprises a rubber component with a diene skeleton, a photopolymerization initiator, a crosslinker and a tackifier. The composition contains a solid rubber component and a liquid rubber component at 25° C. as the rubber component with the diene. Since the UV curable composition can be cured by UV irradiation in a short time, it can be applied not only to adherends with high heat resistance but also to various parts.