Optical Fiber Resinous Coating Alcohol Control
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Solution Overview
Problem
Existing optical fibers with a three-layer resinous coating layer increase production costs due to the need for additional apparatus and processes, and may compromise tensile strength due to alcohol byproducts from silane coupling agents.
Innovation Solution
An optical fiber with a resinous coating layer containing 10 mg or less of ethanol or 2 mg or less of methanol per gram, and a two-layer structure to maintain high tensile strength without increasing production costs, using a silane coupling agent that undergoes a sol-gel reaction with silanol groups on the glass fiber surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a three-layer resinous coating layer is used to improve tensile strength, then tensile strength is improved, but production cost increases due to additional apparatus and processes
Solution Approach 1:
The invention changes the chemical composition parameters of the resinous coating layer by strictly controlling the alcohol content (ethanol ≤10 mg/g or methanol ≤2 mg/g) to achieve high tensile strength with a standard two-layer structure, eliminating the need for an additional layer while maintaining performance
Solution Approach 2:
The invention uses a composite resinous coating layer comprising a primary layer and a secondary layer, where the primary layer contains a silane coupling agent that undergoes sol-gel reaction with silanol groups on the glass fiber surface, creating a chemically bonded composite structure that achieves high tensile strength without requiring three layers
2Strength
If a silane coupling agent undergoes sol-gel reaction with silanol groups on glass fiber surface to improve bonding, then bonding strength is improved, but alcohol byproducts are generated which may compromise tensile strength
Solution Approach 1:
The invention converts the harmful effect of alcohol byproducts into a beneficial process control parameter by establishing specific alcohol content thresholds (ethanol ≤10 mg/g or methanol ≤2 mg/g), transforming the sol-gel reaction from a source of weakness into a controlled bonding mechanism that enhances tensile strength
Solution Approach 2:
The invention changes the chemical environment parameters by controlling alcohol content during and after the sol-gel reaction process, ensuring that the bonding reaction produces maximum strength while minimizing harmful byproduct accumulation that would compromise tensile strength
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 optical fiber achieves high tensile strength and suppressed transmission loss increase when immersed in hot water, while reducing the amount of silane coupling agent and alcohol byproducts, thus maintaining performance without additional coating layers or increased costs.
Implementation Method 1
The silane coupling agent contained in the resin composition undergoes a sol-gel reaction with silanol groups present on the glass fiber surface to thereby form tenacious bonds between the glass fiber and the resinous coating layer
Implementation Method 2
When the silane coupling agent undergoes a sol-gel reaction with silanol groups present on the glass fiber surface, an alcohol is produced from the alkoxy group(s) possessed by the silane coupling agent
Data Source
AI summary
The present invention relates to an optical fiber containing a glass fiber and a resinous coating layer that covers a periphery of the glass fiber, in which the resinous coating layer contains an ethanol of 10 mg or less or a methanol of 2 mg or less per gram of the resinous coating layer.