Silane Compound Polymer Fixing Material for Optical Device Sealing
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Solution Overview
Problem
Optical device sealing materials with polysilsesquioxane compounds exhibit yellowing and insufficient hardness when exposed to high-energy light or high-temperature heat, leading to decreased transparency and heat resistance, which compromises the longevity and performance of sealed optical devices.
Innovation Solution
A fixing material comprising a silane compound polymer, produced by condensing a mixture of silane compounds with ester or cyanoalkyl groups and tetrafunctional silane compounds, which provides excellent transparency, heat resistance, and high hardness when cured, even under prolonged exposure to high-energy light or heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysilsesquioxane compound is used as optical device sealing material, then crack resistance and heat resistance are improved, but yellowing occurs under high-energy light or high-temperature heat exposure
Solution Approach 1:
The patent uses a composite material system consisting of polysilsesquioxane compound combined with specific additives (UV absorbers, hydrogen donors, or radical scavengers) to resolve the contradiction. The base polysilsesquioxane provides crack resistance and heat resistance, while the additives specifically address yellowing by absorbing UV radiation or scavenging free radicals that cause coloration. This composite approach allows simultaneous achievement of both durability and optical stability.
2Temperature
If polysilsesquioxane compound is used as optical device sealing material, then heat resistance is improved, but hardness is insufficient causing easy deformation
Solution Approach 1:
The patent combines polysilsesquioxane compound with specific inorganic fillers (such as silica particles, alumina particles, or other ceramic fillers) to create a composite material that simultaneously improves both heat resistance and hardness. The inorganic fillers provide structural rigidity and resistance to deformation while the polysilsesquioxane matrix maintains thermal stability. This composite strategy resolves the contradiction between softness and heat resistance.
3Temperature
If transparent epoxy resin is used as optical device sealing material, then heat resistance is improved, but yellowing and cracking occur under prolonged high-energy light or high-temperature exposure
Solution Approach 1:
The patent fundamentally changes the chemical composition parameter from conventional transparent epoxy resin to polysilsesquioxane compound. This parameter change transforms the material's molecular structure to be inherently more resistant to both yellowing and cracking under thermal and photonic stress. The inorganic-based polysilsesquioxane network provides superior thermal stability and mechanical integrity compared to organic epoxy systems, especially under prolonged exposure to high-energy light and high temperatures.
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 silane compound polymer-based fixing material maintains high transparency and heat resistance over time, preventing coloration and deformation, ensuring the longevity and performance of sealed optical devices with improved adhesion properties.
Implementation Method 1
a silane compound polymer obtained by condensing a mixture of a silane compound that is shown by the following formula (1) and includes a group that includes an ester structure or a cyanoalkyl group and a tetrafunctional silane compound
Implementation Method 2
a cured product of the fixing material that exhibits excellent transparency and heat resistance over a long time, and exhibits high hardness even when subjected to high-energy light or high-temperature heat generated by an optical device
Implementation Method 3
a cured product of the fixing material that exhibits excellent transparency and heat resistance over a long time
Data Source
AI summary
A fixing material includes a silane compound polymer as the main component, the silane compound polymer being produced by condensing a silane compound mixture that includes at least one silane compound (1) shown by the following formula (1): R1Si(OR2)p(X1)3-p (wherein R1 represents a group including an ester structure or a cyanoalkyl group, R2 represents an alkyl group having 1 to 6 carbon atoms or the like, X1 represents a halogen atom, and p is an integer from 0 to 3), and at least one silane compound (2) shown by the following formula (2): Si(OR3)q(X2)4-q (wherein R3 represents an alkyl group having 1 to 6 carbon atoms, X2 represents a halogen atom, and q is an integer from 0 to 4). A sealed optical device includes an optical device that is sealed with a cured product of the fixing material. The fixing material produces a cured product that exhibits high hardness, excellent transparency and heat resistance, and rarely undergoes coloration even when subjected to high-energy light or heat for a long time.