Silane-Modified Metal Oxide Dispersion for Silicone Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Metal oxide particles agglomerate when mixed with methyl-based silicone resin, leading to turbidity and reduced transparency in sealing materials, which is exacerbated by the increasing demand for high heat-resistant resins in LED applications.
Innovation Solution
A dispersion liquid containing metal oxide particles surface-modified with a silane compound and a silicone compound, where the ratio of silane compound to silicone compound is controlled to ensure sufficient attachment, suppressing agglomeration and maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal oxide particles are mixed with methyl-based silicone resin to improve refractive index and light extraction efficiency, then the refractive index and brightness improve, but the metal oxide particles agglomerate causing turbidity and reduced transparency
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the metal oxide particles and the methyl-based silicone resin. The silane coupling agent modifies the surface of the metal oxide particles, providing compatibility with the hydrophobic silicone resin matrix, thereby preventing agglomeration and maintaining transparency while allowing high metal oxide content for improved refractive index and brightness
Solution Approach 2:
The surface properties of metal oxide particles are changed through silane modification, altering their hydrophobicity to match the methyl-based silicone resin environment. This parameter change in surface chemistry prevents agglomeration and enables uniform dispersion, resolving the transparency issue while maintaining the refractive index enhancement
2Illumination intensity
If the content of metal oxide particles in sealing material is increased to improve refractive index, then the light extraction efficiency improves, but the agglomeration of metal oxide particles becomes more significant
Solution Approach 1:
The silane coupling agent serves as a mediator that enables higher metal oxide particle content to be incorporated into the sealing material without causing agglomeration. By modifying the particle surfaces, it maintains dispersion stability even at elevated metal oxide concentrations, thus improving light extraction efficiency while preserving composition stability
Solution Approach 2:
A composite surface structure is created on the metal oxide particles through silane modification, combining the high refractive index properties of metal oxide with the hydrophobic compatibility of silane-modified surfaces. This composite approach allows high particle content for improved light extraction while maintaining dispersion stability in the methyl-based silicone resin matrix
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 dispersion liquid allows for uniform dispersion of metal oxide particles in methyl-based silicone resin, enhancing the refractive index and brightness of light-emitting devices while maintaining transparency.
Implementation Method 1
metal oxide particles which have been surface-modified with a silane compound and a silicone compound
Implementation Method 2
a composition for forming a light scattering complex containing metal oxide particles
Data Source
AI summary
A dispersion liquid according to the present invention is a dispersion liquid containing metal oxide particles which have been surface-modified with a silane compound and a silicone compound, in which, when the dispersion liquid is dried by vacuum drying to separate the metal oxide particles, and a transmission spectrum of the separated metal oxide particles is measured in a wavenumber range from 800 cm−1 to 3800 cm−1 with a Fourier transform infrared spectrophotometer, Formula (1) below: IA/IB≤3.5 is satisfied (in the formula, “IA” represents a spectrum value at 3500 cm−1 and “IB” represents a spectrum value at 1100 cm−1).