Optical Fiber Coating Adhesion via Platinum Catalyst
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Solution Overview
Problem
Optical fibers with a coating resin layer comprising a silicone resin primary layer and a urethane (meth)acrylate resin secondary layer often experience insufficient adhesion between the two layers due to differences in polarity, leading to reduced lateral pressure resistance and increased microbending loss.
Innovation Solution
Incorporating a controlled amount of platinum catalyst in the primary resin layer, within a specific range of 25 ppm to 280 ppm, to enhance the adhesion between the silicone resin and urethane (meth)acrylate resin layers, and using a cured product of a first resin composition containing silicone compounds with vinylsilyl and hydrosilyl groups, and a second resin composition including urethane (meth)acrylate and a photopolymerization initiator, with optional epoxy (meth)acrylate for improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating resin layer includes a silicone resin primary layer and a urethane (meth)acrylate resin secondary layer, then lateral pressure resistance is improved, but adhesion between the primary and secondary resin layers deteriorates due to polarity differences
Solution Approach 1:
A silane-modified urethane (meth)acrylate resin is used as the secondary resin layer to act as an intermediary between the silicone resin primary layer and the urethane (meth)acrylate resin. The silane modification provides polarity that matches both the silicone resin and the urethane (meth)acrylate resin, creating strong adhesion between the two layers while maintaining the lateral pressure resistance benefits of the composite coating structure.
Solution Approach 2:
The coating resin layer is designed as a composite structure with a silane-modified urethane (meth)acrylate resin in the secondary layer, combining the properties of silicone resin (lateral pressure resistance) and urethane (meth)acrylate resin (adhesion) through chemical modification to achieve both goals simultaneously.
2Quantity of substance
If the packing density of optical fibers in a cable is increased, then cable density is improved, but microbending loss increases due to lateral pressure on optical fibers
Solution Approach 1:
The coating resin layer with its specific two-layer structure provides beforehand cushioning by creating a compliant primary silicone resin layer that can deform to absorb lateral pressure before it reaches the optical fiber, preventing microbending loss while enabling higher packing density in cables.
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
This approach significantly improves the adhesion between the primary and secondary resin layers, enhancing the lateral pressure resistance and reducing microbending loss, thereby stabilizing the optical fiber and preventing delamination in optical fiber ribbons.
Implementation Method 1
a platinum catalyst, wherein the primary resin layer is a cured product of a first resin composition containing a silicone compound having a vinylsilyl group, a silicone compound having a hydrosilyl group, and the platinum catalyst
Implementation Method 2
a second resin composition including a urethane (meth)acrylate and a photopolymerization initiator
Data Source
AI summary
An optical fiber comprises a glass fiber including a core and a cladding, and a coating resin layer for coating the glass fiber; the coating resin layer has a primary resin layer in contact with the glass fiber for coating the glass fiber, and a secondary resin layer for coating the primary resin layer; the primary resin layer includes a silicone resin; the secondary resin layer includes a urethane (meth)acrylate resin; and the amount of platinum contained in the primary resin layer is 25 ppm or more and 280 ppm or less in a mass ratio.