Light Blocking Adhesive with Azo Dye for UV Protection
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Solution Overview
Problem
Existing adhesives fail to effectively block ultraviolet light and a part of visible light, leading to deterioration of products and potential yellowish discoloration due to the absorption of wavelengths beyond 380 nm, which can affect the performance and longevity of display devices.
Innovation Solution
A light-blocking adhesive comprising a copolymer with a (meth)acrylate-based, silicon-based, or urethane-based monomer and an azo-based dye monomer, which absorbs light in the 380 nm to 420 nm range, preventing the transmission of near-ultraviolet and visible light, while maintaining sufficient adhesiveness and preventing dye bleed-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing adhesives are used to block ultraviolet light, then light blocking function is improved, but yellowish discoloration occurs due to absorption of wavelengths beyond 380 nm
Solution Approach 1:
The patent modifies the molecular structure of the adhesive by incorporating specific photostabilizer structures and adjusting the chemical composition parameters to change the light absorption characteristics, ensuring absorption is limited to the 380-420 nm range without extending to wavelengths that cause yellowing
Solution Approach 2:
The adhesive is formulated as a composite material containing multiple functional components including base adhesive polymers, azo-based dye molecules for targeted UV absorption, and photostabilizer structures that prevent degradation and yellowing, creating a synergistic light-blocking system
2Object-affected harmful factors
If light absorbing groups are added to block ultraviolet light, then light blocking function is improved, but dye aggregation and haze occur
Solution Approach 1:
The light-absorbing azo-based dye groups are incorporated at specific local concentrations within the adhesive matrix, with controlled distribution to ensure effective UV absorption while preventing aggregation. The dye content is optimized to provide sufficient light blocking without exceeding the threshold that causes haze
Solution Approach 2:
The adhesive polymer matrix acts as an intermediary medium that disperses and stabilizes the light-absorbing dye molecules, preventing their aggregation. The polymer chains provide steric hindrance and solvation effects that keep dye molecules separated at the molecular level while maintaining their light-absorbing functionality
3Reliability
If adhesive composition is modified to improve light blocking, then ultraviolet resistance is improved, but adhesiveness may deteriorate
Solution Approach 1:
The adhesive composition is designed with multi-functionality, where the base polymer provides both adhesive bonding properties and a matrix for light-blocking components. The photostabilizer and dye molecules are integrated into the adhesive system without compromising the fundamental bonding mechanisms, achieving simultaneous UV resistance and adhesion 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 adhesive effectively blocks ultraviolet light and visible light in the target range, preventing product deterioration and yellowing, while ensuring good light and heat resistance, and reducing the risk of dye aggregation and haze in display devices.
Implementation Method 1
the second monomer includes a light absorbing group, and the light absorbing group is an azo-based dye. The light absorbing group may have an absorption wavelength of about 380 nm to about 420 nm.
Data Source
AI summary
An adhesive including a copolymer that includes repeating units of a first monomer and a second monomer, wherein: the first monomer includes a (meth)acrylate-based monomer, a silicon-based monomer, or an urethane-based monomer, the second monomer includes a light absorbing group, and the light absorbing group is an azo-based dye.