Fluoropolymer Adhesive for UV-LED Optical Member Bonding
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Solution Overview
Problem
Adhesives for ultraviolet-light-emitting devices using UV light with wavelengths from 200 to 400 nm fail to provide sufficient adhesiveness and durability due to degradation from UV exposure and heat, leading to detachment of optical members made from fluorine-containing alicyclic polymers.
Innovation Solution
Development of an adhesive comprising a fluoropolymer with a glass transition temperature between 30 to 100°C, either without or with an ultraviolet-shielding agent, which includes inorganic or organic particles, to enhance adhesiveness and resistance to UV light and heat, ensuring strong bonding between the light-emitting element and optical member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fluoropolymer with -CH2- in the main chain is used as adhesive, then the adhesive can be processed easily, but the adhesive deteriorates under UV light and heat exposure, generating acidic decomposition gases
Solution Approach 1:
The invention changes the chemical composition parameters of the fluoropolymer by replacing -CH2- groups with -CF2- groups in the main chain, transforming the polymer structure from polyvinylidene fluoride to polyvinylidene fluoride-co-perfluoroethylene copolymer. This parameter change eliminates hydrogen atoms that would otherwise form acidic decomposition gases under UV and heat exposure, while maintaining the polymer's processability and adhesive properties.
Solution Approach 2:
The invention creates a composite adhesive material by forming a copolymer structure that combines polyvinylidene fluoride units with perfluoroethylene units. This composite structure integrates the beneficial properties of both polymer types: the adhesive characteristics of polyvinylidene fluoride and the UV/heat resistance of perfluoroethylene, resulting in an adhesive that resists deterioration under UV light and heat exposure.
2Strength
If conventional adhesives are used for bonding optical members, then initial bonding is achieved, but the adhesive joint fails under prolonged UV light and heat exposure
Solution Approach 1:
The invention modifies the chemical parameters of the adhesive polymer by eliminating hydrogen atoms from the main chain through the use of perfluoroethylene units. This parameter change prevents the formation of acidic decomposition gases under UV and heat exposure, thereby maintaining adhesive strength and joint durability in harsh environments without sacrificing initial bonding capability.
Solution Approach 2:
The invention replaces conventional fluoropolymers with -CH2- groups that have short service life under UV/heat exposure with a more stable copolymer structure. Although the copolymer may have slightly different processing characteristics, it provides long-term durability by resisting decomposition and maintaining adhesive strength throughout the device's operational lifetime under UV light and heat exposure.
3Reliability
If quartz is used for optical members, then UV light resistance is achieved, but production efficiency is low due to difficult molding
Solution Approach 1:
The invention replaces expensive and difficult-to-process quartz with fluoropolymer-based optical members that can be easily molded. The fluoropolymer contains no hydrogen atoms bonded to carbon, providing UV light resistance comparable to quartz while enabling high-efficiency injection molding and other conventional polymer processing techniques, thereby significantly improving production efficiency.
4Strength
If adhesive joints are formed with conventional fluoropolymers, then bonding is achieved, but the joints detach under prolonged UV light and heat exposure
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by using a copolymer structure where perfluoroethylene units replace -CH2- groups in the main chain. This parameter change eliminates hydrogen atoms that would form acidic decomposition gases, thereby maintaining the adhesive's chemical stability and bonding strength under prolonged UV light and heat exposure without detachment of optical members.
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 maintains excellent adhesiveness and mechanical strength, resisting UV light and heat exposure, thereby preventing detachment of optical members and ensuring the longevity of ultraviolet-light-emitting devices.
Implementation Method 1
the adhesive (B) comprising the fluoropolymer and an ultraviolet-shielding agent
Data Source
Figure 1~2
Figure 3
AI summary
Provided is an adhesive for use in an ultraviolet-light-emitting device using ultraviolet light having a wavelength of from 200 to 400 nm as a light source, which can attach adherends made of a polymer having a fluorine-containing alicyclic structure with excellent adhesiveness which is unlikely to be impaired by exposure to such ultraviolet light or heat. An adhesive for forming an adhesive joint in an ultraviolet-light-emitting device, which is either the following adhesive (A) or the following adhesive (B) comprising a fluoropolymer having a fluorine-containing alicyclic structure: the adhesive (A): an adhesive in which the glass transition temperature of the fluoropolymer is from 30 to 100°C, and which does not contain an ultraviolet-shielding agent; and the adhesive (B): an adhesive comprising the fluoropolymer and an ultraviolet-shielding agent.